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/* -*-mode:c; c-style:k&r; c-basic-offset:4; -*- */
/* GMime message header filter
* Written/Copyright (c) by Albrecht Dreß <albrecht.dress@arcor.de> 2017
* This module remove RFC 822 massage headers which shall not be sent to the MTA from from a message stream, including Bcc, Status,
* X-Status and X-Balsa-*.
*
* The basic structure of this file has been shamelessly stolen from the gmime-filter-* files, written by Jeffrey Stedfast.
*
* 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 2.1 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <string.h>
#include "gmime-filter-header.h"
static void g_mime_filter_header_finalize(GObject *object);
static GMimeFilter *filter_copy(GMimeFilter *filter);
static void filter_filter(GMimeFilter *filter, char *in, size_t len, size_t prespace, char **out, size_t *outlen,
size_t *outprespace);
static void filter_complete(GMimeFilter *filter, char *in, size_t len, size_t prespace, char **out, size_t *outlen,
size_t *outprespace);
static void filter_reset(GMimeFilter *filter);
struct _GMimeFilterHeader {
GMimeFilter parent_object;
gboolean headers_done;
gboolean drop_header;
};
G_DEFINE_TYPE(GMimeFilterHeader, g_mime_filter_header, GMIME_TYPE_FILTER)
static void
g_mime_filter_header_class_init(GMimeFilterHeaderClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS(klass);
GMimeFilterClass *filter_class = GMIME_FILTER_CLASS(klass);
object_class->finalize = g_mime_filter_header_finalize;
filter_class->copy = filter_copy;
filter_class->filter = filter_filter;
filter_class->complete = filter_complete;
filter_class->reset = filter_reset;
}
static void
g_mime_filter_header_init(GMimeFilterHeader *self)
{
self->headers_done = FALSE;
self->drop_header = FALSE;
}
static void
g_mime_filter_header_finalize(GObject *object)
{
G_OBJECT_CLASS(g_mime_filter_header_parent_class)->finalize(object);
}
static GMimeFilter *
filter_copy(GMimeFilter *filter)
{
return g_mime_filter_header_new();
}
static void
filter_filter(GMimeFilter *filter, char *inbuf, size_t inlen, size_t prespace,
char **outbuf, size_t *outlen, size_t *outprespace)
{
GMimeFilterHeader *self = GMIME_FILTER_HEADER(filter);
g_mime_filter_set_size(filter, inlen, FALSE);
if (self->headers_done) {
memcpy(filter->outbuf, inbuf, inlen);
*outlen = inlen;
} else {
gchar *newline;
gchar *outptr;
outptr = filter->outbuf;
*outlen = 0U;
newline = memchr(inbuf, '\n', inlen);
while ((newline != NULL) && !self->headers_done) {
size_t count;
/* number of chars in this line */
count = (newline - inbuf) + 1U;
/* check for for folded header continuation */
if ((inbuf[0] == ' ') || (inbuf[0] == '\t')) {
/* nothing to do, do not change the state */
} else if (newline == inbuf) {
self->headers_done = TRUE;
} else if (((count >= 4U) && (g_ascii_strncasecmp(inbuf, "Bcc:", 4U) == 0)) ||
((count >= 7U) && (g_ascii_strncasecmp(inbuf, "Status:", 7U) == 0)) ||
((count >= 9U) && (g_ascii_strncasecmp(inbuf, "X-Status:", 9U) == 0)) ||
((count >= 8U) && (g_ascii_strncasecmp(inbuf, "X-Balsa-", 8U) == 0))) {
self->drop_header = TRUE;
} else {
self->drop_header = FALSE;
}
/* copy if we want to keep this header */
if (!self->drop_header) {
memcpy(outptr, inbuf, count);
outptr = &outptr[count];
*outlen += count;
}
/* adjust */
inbuf = &inbuf[count];
inlen -= count;
if (!self->headers_done && (inlen > 0)) {
newline = memchr(inbuf, '\n', inlen);
} else {
newline = NULL;
}
}
/* back up left-over data */
if (inlen > 0U) {
g_mime_filter_backup(filter, inbuf, inlen);
}
}
*outprespace = filter->outpre;
*outbuf = filter->outbuf;
}
static void
filter_complete(GMimeFilter *filter, char *inbuf, size_t inlen, size_t prespace,
char **outbuf, size_t *outlen, size_t *outprespace)
{
filter_filter(filter, inbuf, inlen, prespace, outbuf, outlen, outprespace);
}
static void
filter_reset(GMimeFilter *filter)
{
}
GMimeFilter *
g_mime_filter_header_new()
{
GMimeFilterHeader *header;
header = g_object_new(GMIME_TYPE_FILTER_HEADER, NULL);
return (GMimeFilter *) header;
}
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