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/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "array.h"
#include "ostream-private.h"
#include "ostream-dot.h"
enum dot_ostream_state {
STREAM_STATE_INIT = 0,
STREAM_STATE_NONE,
STREAM_STATE_CR,
STREAM_STATE_CRLF,
STREAM_STATE_DONE
};
struct dot_ostream {
struct ostream_private ostream;
enum dot_ostream_state state;
bool force_extra_crlf;
};
static int o_stream_dot_finish(struct ostream_private *stream)
{
struct dot_ostream *dstream = (struct dot_ostream *)stream;
int ret;
if (dstream->state == STREAM_STATE_DONE)
return 1;
if (o_stream_get_buffer_avail_size(stream->parent) < 5) {
/* make space for the dot line */
if ((ret = o_stream_flush(stream->parent)) <= 0) {
if (ret < 0)
o_stream_copy_error_from_parent(stream);
return ret;
}
}
if (dstream->state == STREAM_STATE_CRLF &&
!dstream->force_extra_crlf) {
ret = o_stream_send(stream->parent, ".\r\n", 3);
i_assert(ret == 3);
} else {
ret = o_stream_send(stream->parent, "\r\n.\r\n", 5);
i_assert(ret == 5);
}
dstream->state = STREAM_STATE_DONE;
return 1;
}
static int
o_stream_dot_flush(struct ostream_private *stream)
{
int ret;
if (stream->finished) {
if ((ret = o_stream_dot_finish(stream)) <= 0)
return ret;
}
return o_stream_flush_parent(stream);
}
static void
o_stream_dot_close(struct iostream_private *stream, bool close_parent)
{
struct dot_ostream *dstream = (struct dot_ostream *)stream;
if (close_parent)
o_stream_close(dstream->ostream.parent);
}
static ssize_t
o_stream_dot_sendv(struct ostream_private *stream,
const struct const_iovec *iov, unsigned int iov_count)
{
struct dot_ostream *dstream = (struct dot_ostream *)stream;
ARRAY(struct const_iovec) iov_arr;
const struct const_iovec *iov_new;
size_t max_bytes, sent, added;
unsigned int count, i;
ssize_t ret;
i_assert(dstream->state != STREAM_STATE_DONE);
if ((ret=o_stream_flush(stream->parent)) <= 0) {
/* error / we still couldn't flush existing data to
parent stream. */
if (ret < 0)
o_stream_copy_error_from_parent(stream);
return ret;
}
/* check for dots */
t_array_init(&iov_arr, iov_count + 32);
max_bytes = o_stream_get_buffer_avail_size(stream->parent);
i_assert(max_bytes > 0); /* FIXME: not supported currently */
sent = added = 0;
for (i = 0; i < iov_count && max_bytes > 0; i++) {
size_t size = iov[i].iov_len, chunk;
const char *data = iov[i].iov_base, *p, *pend;
struct const_iovec iovn;
p = data;
pend = CONST_PTR_OFFSET(data, size);
for (; p < pend && (size_t)(p-data)+2 < max_bytes; p++) {
char add = 0;
switch (dstream->state) {
/* none */
case STREAM_STATE_NONE:
switch (*p) {
case '\n':
dstream->state = STREAM_STATE_CRLF;
/* add missing CR */
add = '\r';
break;
case '\r':
dstream->state = STREAM_STATE_CR;
break;
}
break;
/* got CR */
case STREAM_STATE_CR:
switch (*p) {
case '\r':
break;
case '\n':
dstream->state = STREAM_STATE_CRLF;
break;
default:
dstream->state = STREAM_STATE_NONE;
break;
}
break;
/* got CRLF, or the first line */
case STREAM_STATE_INIT:
case STREAM_STATE_CRLF:
switch (*p) {
case '\r':
dstream->state = STREAM_STATE_CR;
break;
case '\n':
dstream->state = STREAM_STATE_CRLF;
/* add missing CR */
add = '\r';
break;
case '.':
/* add dot */
add = '.';
/* fall through */
default:
dstream->state = STREAM_STATE_NONE;
break;
}
break;
case STREAM_STATE_DONE:
i_unreached();
}
if (add != 0) {
chunk = (size_t)(p - data);
if (chunk > 0) {
/* forward chunk to new iovec */
iovn.iov_base = data;
iovn.iov_len = chunk;
array_push_back(&iov_arr, &iovn);
data = p;
i_assert(max_bytes >= chunk);
max_bytes -= chunk;
sent += chunk;
}
/* insert byte (substitute one with pair) */
data++;
iovn.iov_base = (add == '\r' ? "\r\n" : "..");
iovn.iov_len = 2;
array_push_back(&iov_arr, &iovn);
i_assert(max_bytes >= 2);
max_bytes -= 2;
added++;
sent++;
}
}
if (max_bytes == 0)
break;
chunk = ((size_t)(p-data) >= max_bytes ?
max_bytes : (size_t)(p - data));
if (chunk > 0) {
iovn.iov_base = data;
iovn.iov_len = chunk;
array_push_back(&iov_arr, &iovn);
i_assert(max_bytes >= chunk);
max_bytes -= chunk;
sent += chunk;
}
}
/* send */
iov_new = array_get(&iov_arr, &count);
if (count == 0) {
ret = 0;
} else if ((ret=o_stream_sendv(stream->parent, iov_new, count)) <= 0) {
i_assert(ret < 0);
o_stream_copy_error_from_parent(stream);
return -1;
}
/* all must be sent */
i_assert((size_t)ret == sent + added);
stream->ostream.offset += sent;
return sent;
}
struct ostream *
o_stream_create_dot(struct ostream *output, bool force_extra_crlf)
{
struct dot_ostream *dstream;
dstream = i_new(struct dot_ostream, 1);
dstream->ostream.sendv = o_stream_dot_sendv;
dstream->ostream.iostream.close = o_stream_dot_close;
dstream->ostream.flush = o_stream_dot_flush;
dstream->ostream.max_buffer_size = output->real_stream->max_buffer_size;
dstream->force_extra_crlf = force_extra_crlf;
(void)o_stream_create(&dstream->ostream, output, o_stream_get_fd(output));
/* ostream-dot is always used inside another ostream that shouldn't
get finished when the "." line is written. Disable it here so all
of the callers don't have to set this. */
o_stream_set_finish_also_parent(&dstream->ostream.ostream, FALSE);
return &dstream->ostream.ostream;
}
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