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/*
* Example application demonstrating the GMime parser's feature for
* detecting and reporting RFC violations in messages.
*
* Written by (C) Albrecht Dreß <albrecht.dress@arcor.de> 2017
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <gmime/gmime.h>
static const gchar *
errcode2str(GMimeParserWarning errcode)
{
switch (errcode) {
case GMIME_WARN_DUPLICATED_HEADER:
return "duplicated header";
case GMIME_WARN_DUPLICATED_PARAMETER:
return "duplicated header parameter";
case GMIME_WARN_UNENCODED_8BIT_HEADER:
return "unencoded 8-bit characters in header";
case GMIME_WARN_INVALID_CONTENT_TYPE:
return "invalid Content-Type";
case GMIME_WARN_INVALID_RFC2047_HEADER_VALUE:
return "invalid RFC 2047 encoded header value";
case GMIME_WARN_INVALID_PARAMETER:
return "invalid header parameter";
case GMIME_WARN_MALFORMED_MULTIPART:
return "malformed multipart";
case GMIME_WARN_TRUNCATED_MESSAGE:
return "truncated message";
case GMIME_WARN_MALFORMED_MESSAGE:
return "malformed message";
case GMIME_WARN_INVALID_ADDRESS_LIST:
return "invalid address list";
case GMIME_CRIT_INVALID_HEADER_NAME:
return "invalid header name, parser may skip the message or parts of it";
case GMIME_CRIT_CONFLICTING_HEADER:
return "conflicting duplicated header";
case GMIME_CRIT_CONFLICTING_PARAMETER:
return "conflicting header parameter";
case GMIME_CRIT_MULTIPART_WITHOUT_BOUNDARY:
return "multipart without boundary";
case GMIME_WARN_PART_WITHOUT_CONTENT:
return "MIME part without content encountered";
case GMIME_CRIT_PART_WITHOUT_HEADERS_OR_CONTENT:
return "MIME part without headers or content encountered";
default:
return "unknown";
}
}
static int issues = 0;
static void
parser_issue (gint64 offset, GMimeParserWarning errcode, const gchar *item, gpointer user_data)
{
char *message;
if (item == NULL) {
message = g_strdup (errcode2str (errcode));
} else {
gchar *buf;
buf = g_strdup (item);
g_strstrip (buf);
message = g_strdup_printf ("%s: '%s'", errcode2str (errcode), buf);
g_free (buf);
}
g_printf ("offset %" G_GINT64_FORMAT ": [%u] %s\n", offset, errcode, message);
g_free (message);
issues++;
}
static void
check_msg_file (const gchar *filename)
{
GMimeStream *stream;
GError *error = NULL;
stream = g_mime_stream_file_open (filename, "r", &error);
if (stream == NULL) {
g_warning ("failed to open %s: %s", filename, error->message);
g_error_free (error);
} else {
GMimeParser *parser;
GMimeParserOptions *options;
GMimeMessage *message;
parser = g_mime_parser_new ();
g_mime_parser_init_with_stream (parser, stream);
options = g_mime_parser_options_new ();
g_mime_parser_options_set_warning_callback (options, parser_issue, NULL);
message = g_mime_parser_construct_message (parser, options);
g_mime_parser_options_free (options);
g_object_unref (parser);
g_object_unref (stream);
if (message != NULL) {
g_object_unref (message);
}
if (issues == 0) {
g_printf ("%s: message looks benign\n", filename);
} else {
g_printf ("%s: message contained %d RFC violations.\n", filename, issues);
}
}
}
int
main (int argc, char **argv)
{
int n;
if (argc < 2) {
g_message ("usage: %s <filename> [<filename> ...]", argv[0]);
exit (1);
}
g_mime_init ();
for (n = 1; n < argc; n++) {
check_msg_file (argv[n]);
}
g_mime_shutdown ();
return 0;
}
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