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322 lines
10 KiB
322 lines
10 KiB
/*
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* libEtPan! -- a mail stuff library
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*
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* Copyright (C) 2001, 2013 - DINH Viet Hoa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the libEtPan! project nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Created by Ian Ragsdale on 3/8/13. */
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#include <stddef.h>
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#include "mailstream_compress.h"
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#if !HAVE_ZLIB
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mailstream_low * mailstream_low_compress_open(mailstream_low * ms)
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{
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return NULL;
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}
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#include <zlib.h>
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#include <assert.h>
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#include "mailstream_low.h"
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#include "mailstream_low.h"
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#include "mailstream_cancel.h"
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#define CHUNK_SIZE 1024
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static ssize_t mailstream_low_compress_read(mailstream_low * s, void * buf, size_t count);
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static ssize_t mailstream_low_compress_write(mailstream_low * s, const void * buf, size_t count);
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static int mailstream_low_compress_close(mailstream_low * s);
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static int mailstream_low_compress_get_fd(mailstream_low * s);
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static struct mailstream_cancel * mailstream_low_compress_get_cancel(mailstream_low * s);
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static void mailstream_low_compress_free(mailstream_low * s);
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static void mailstream_low_compress_cancel(mailstream_low * s);
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static carray * mailstream_low_compress_get_certificate_chain(mailstream_low * s);
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typedef struct mailstream_compress_data
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{
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mailstream_low * ms;
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z_stream *compress_stream;
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z_stream *decompress_stream;
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unsigned char input_buf[CHUNK_SIZE];
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unsigned char output_buf[CHUNK_SIZE];
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} compress_data;
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static mailstream_low_driver local_mailstream_compress_driver = {
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/* mailstream_read */ mailstream_low_compress_read,
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/* mailstream_write */ mailstream_low_compress_write,
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/* mailstream_close */ mailstream_low_compress_close,
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/* mailstream_get_fd */ mailstream_low_compress_get_fd,
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/* mailstream_free */ mailstream_low_compress_free,
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/* mailstream_cancel */ mailstream_low_compress_cancel,
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/* mailstream_get_cancel */ mailstream_low_compress_get_cancel,
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/* mailstream_get_certificate_chain */ mailstream_low_compress_get_certificate_chain,
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};
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mailstream_low_driver * mailstream_compress_driver = &local_mailstream_compress_driver;
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static mailstream_low * mailstream_low_compress_open(mailstream_low * ms)
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{
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mailstream_low * s;
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/* stores the original mailstream */
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struct mailstream_compress_data * compress_data = malloc(sizeof(* compress_data));
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if (compress_data == NULL)
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goto err;
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/* allocate deflate state */
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compress_data->compress_stream = malloc(sizeof(z_stream));
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compress_data->compress_stream->zalloc = Z_NULL;
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compress_data->compress_stream->zfree = Z_NULL;
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compress_data->compress_stream->opaque = Z_NULL;
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/* these specific settings are very important - don't change without looking at the COMPRESS RFC */
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int ret = deflateInit2(compress_data->compress_stream, Z_BEST_SPEED, Z_DEFLATED, -15, 8, Z_DEFAULT_STRATEGY);
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if (ret != Z_OK) {
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goto free_compress_data;
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}
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compress_data->compress_stream->avail_in = 0;
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compress_data->compress_stream->avail_out = 0;
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/* allocate inflate state */
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compress_data->decompress_stream = malloc(sizeof(z_stream));
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compress_data->decompress_stream->zalloc = Z_NULL;
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compress_data->decompress_stream->zfree = Z_NULL;
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compress_data->decompress_stream->opaque = Z_NULL;
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/* these specific settings are very important - don't change without looking at the COMPRESS RFC */
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ret = inflateInit2(compress_data->decompress_stream, -15);
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if (ret != Z_OK) {
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goto free_compress_data;
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}
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compress_data->decompress_stream->avail_in = 0;
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compress_data->decompress_stream->avail_out = 0;
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compress_data->ms = ms;
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s = mailstream_low_new(compress_data, mailstream_compress_driver);
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if (s == NULL)
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goto free_compress_data;
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return s;
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free_compress_data:
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if (compress_data->compress_stream) {
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deflateEnd(compress_data->compress_stream);
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free(compress_data->compress_stream);
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}
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if (compress_data->decompress_stream) {
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inflateEnd(compress_data->decompress_stream);
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free(compress_data->decompress_stream);
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}
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free(compress_data);
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err:
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return NULL;
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}
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static ssize_t mailstream_low_compress_read(mailstream_low * s, void * buf, size_t count) {
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compress_data *data = s->data;
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data->ms->timeout = s->timeout;
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z_stream *strm = data->decompress_stream;
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int zr;
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do {
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/* if there is no compressed data, read more */
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if (strm->avail_in == 0) {
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int read = data->ms->driver->mailstream_read(data->ms, data->input_buf, CHUNK_SIZE);
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if (read <= 0) {
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return read;
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}
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strm->avail_in = read;
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strm->next_in = data->input_buf;
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}
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/* set the output buffer */
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strm->next_out = buf;
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strm->avail_out = count;
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/* uncompress any waiting data */
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zr = inflate(strm, Z_NO_FLUSH);
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}
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/*
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it's possible that there was data in the stream, but not enough that zlib could figure
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out what to do with it. in this case, read some more and try again.
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*/
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while (zr == Z_OK && strm->avail_in == 0 && strm->avail_out == count);
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/* if we got an error, return -1 to close the connection */
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if (zr < 0) {
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return -1;
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}
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/* let the client know how much data was read */
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return count - strm->avail_out;
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}
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/*
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mostly copied from mailstream_ssl.c
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removed their windows support - we only need iOS
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*/
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static int wait_write_compress(mailstream_low * s)
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{
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fd_set fds_read;
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fd_set fds_write;
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struct timeval timeout;
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int r;
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int fd;
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int max_fd;
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int cancelled;
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int write_enabled;
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// use the session timeout if set
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if (s->timeout) {
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timeout.tv_sec = s->timeout;
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timeout.tv_usec = 0;
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} else {
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timeout = mailstream_network_delay;
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}
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FD_ZERO(&fds_read);
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struct mailstream_cancel * cancel = mailstream_low_compress_get_cancel(s);
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fd = mailstream_cancel_get_fd(cancel);
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FD_SET(fd, &fds_read);
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FD_ZERO(&fds_write);
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FD_SET(mailstream_low_compress_get_fd(s), &fds_write);
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max_fd = mailstream_low_compress_get_fd(s);
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if (fd > max_fd)
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max_fd = fd;
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r = select(max_fd + 1, &fds_read, &fds_write, NULL, &timeout);
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if (r <= 0)
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return -1;
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cancelled = FD_ISSET(fd, &fds_read);
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write_enabled = FD_ISSET(mailstream_low_compress_get_fd(s), &fds_write);
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if (cancelled) {
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/* cancelled */
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mailstream_cancel_ack(cancel);
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return -1;
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}
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if (!write_enabled)
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return 0;
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return 1;
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}
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static ssize_t mailstream_low_compress_write(mailstream_low * s, const void * buf, size_t count) {
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int zr, wr;
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compress_data *data = s->data;
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data->ms->timeout = s->timeout;
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z_stream *strm = data->compress_stream;
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strm->next_in = (Bytef *)buf;
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/* we won't try to compress more than CHUNK_SIZE at a time so we always have enough buffer space */
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int compress_len = MIN(count, CHUNK_SIZE);
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strm->avail_in = compress_len;
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strm->avail_out = CHUNK_SIZE;
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strm->next_out = data->output_buf;
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zr = deflate(strm, Z_PARTIAL_FLUSH);
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assert(zr == Z_OK);
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if (zr < 0) {
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printf("Error deflating: %d %s", zr, strm->msg);
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return -1;
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}
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/*
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wait until we can write to the buffer - we want to avoid any situation where we can have a partial write,
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because with a partial write we can't tell the caller how much uncompressed data was written
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*/
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wait_write_compress(s);
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/* write the data to the underlying mailstream */
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wr = data->ms->driver->mailstream_write(data->ms, data->output_buf, CHUNK_SIZE - strm->avail_out);
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/*
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if we were unable to write all the compressed data to the underlying stream, we're in a bit of trouble
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we don't know how much UNcompressed data was written, so we can't let the client know how much to retry
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so, we return -1 and hope that the wait_write call ensures this never happens
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*/
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int len = CHUNK_SIZE-strm->avail_out;
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if (wr < len) {
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return -1;
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assert(0);
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}
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/* let the caller know how much data we wrote */
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return compress_len - strm->avail_in;
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}
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static int mailstream_low_compress_close(mailstream_low * s) {
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compress_data *data = s->data;
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return data->ms->driver->mailstream_close(data->ms);
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}
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static int mailstream_low_compress_get_fd(mailstream_low * s) {
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compress_data *data = s->data;
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return data->ms->driver->mailstream_get_fd(data->ms);
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}
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static struct mailstream_cancel * mailstream_low_compress_get_cancel(mailstream_low * s) {
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compress_data *data = s->data;
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return data->ms->driver->mailstream_get_cancel(data->ms);
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}
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static void mailstream_low_compress_free(mailstream_low * s) {
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compress_data *data = s->data;
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data->ms->driver->mailstream_free(data->ms);
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if (data->compress_stream) {
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deflateEnd(data->compress_stream);
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free(data->compress_stream);
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}
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if (data->decompress_stream) {
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inflateEnd(data->decompress_stream);
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free(data->decompress_stream);
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}
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free(data);
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free(s);
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}
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static void mailstream_low_compress_cancel(mailstream_low * s) {
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compress_data *data = s->data;
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data->ms->driver->mailstream_cancel(data->ms);
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}
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static carray * mailstream_low_compress_get_certificate_chain(mailstream_low * s) {
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compress_data *data = s->data;
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data->ms->driver->mailstream_get_certificate_chain(data->ms);
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}
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#endif
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