forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
Change all wireshark.org URLs to use https. Fix some broken links while we're at it. Change-Id: I161bf8eeca43b8027605acea666032da86f5ea1c Reviewed-on: https://code.wireshark.org/review/34089 Reviewed-by: Guy Harris <guy@alum.mit.edu>
110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
/* rfc7468.c
|
|
*
|
|
* Implements loading of files in the format specified by RFC 7468.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include "rfc7468.h"
|
|
|
|
#include "file_wrappers.h"
|
|
#include "wtap-int.h"
|
|
|
|
#include <wsutil/buffer.h>
|
|
|
|
#include <glib.h>
|
|
|
|
#include <string.h>
|
|
|
|
/* 128 bytes should be enough to contain any line. Strictly speaking, 64 is
|
|
enough, but we provide some leeway to accomodate nonconformant producers and
|
|
trailing whitespace. The 2 extra bytes are for the trailing newline and NUL
|
|
terminator. */
|
|
#define MAX_LINE_LENGTH (128 + 2)
|
|
|
|
static char *read_complete_text_line(char line[MAX_LINE_LENGTH], FILE_T fh, int *err, gchar **err_info)
|
|
{
|
|
char *line_end;
|
|
|
|
if (!(line_end = file_getsp(line, MAX_LINE_LENGTH, fh))) {
|
|
*err = file_error(fh, err_info);
|
|
return NULL;
|
|
}
|
|
|
|
if (strlen(line) != (size_t)(line_end - line)) {
|
|
*err = 0;
|
|
return NULL;
|
|
}
|
|
|
|
if (line_end[-1] != '\n' && !file_eof(fh)) {
|
|
*err = 0;
|
|
return NULL;
|
|
}
|
|
|
|
return line_end;
|
|
}
|
|
|
|
//
|
|
// Arbitrary value - we don't want to read all of a huge non-RFC 7468 file
|
|
// only to find no pre-encapsulation boundary.
|
|
//
|
|
#define MAX_EXPLANATORY_TEXT_LINES 20
|
|
|
|
wtap_open_return_val rfc7468_open(wtap *wth, int *err, gchar **err_info)
|
|
{
|
|
gboolean found_preeb;
|
|
static const char preeb_begin[] = "-----BEGIN ";
|
|
char line[MAX_LINE_LENGTH];
|
|
|
|
//
|
|
// Skip up to MAX_EXPLANATORY_TEXT_LINES worth of lines that don't
|
|
// look like pre-encapsulation boundaries.
|
|
//
|
|
found_preeb = FALSE;
|
|
for (unsigned int i = 0; i < MAX_EXPLANATORY_TEXT_LINES; i++) {
|
|
if (!read_complete_text_line(line, wth->fh, err, err_info)) {
|
|
if (*err == 0 || *err == WTAP_ERR_SHORT_READ)
|
|
return WTAP_OPEN_NOT_MINE;
|
|
return WTAP_OPEN_ERROR;
|
|
}
|
|
|
|
// Does the line look like a pre-encapsulation boundary?
|
|
if (memcmp(line, preeb_begin, sizeof preeb_begin - 1) == 0) {
|
|
// Yes.
|
|
found_preeb = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
if (!found_preeb)
|
|
return WTAP_OPEN_NOT_MINE;
|
|
|
|
if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
|
|
return WTAP_OPEN_ERROR;
|
|
|
|
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_RFC7468;
|
|
wth->file_encap = WTAP_ENCAP_RFC7468;
|
|
|
|
wth->snapshot_length = 0;
|
|
wth->file_tsprec = WTAP_TSPREC_SEC;
|
|
|
|
wth->subtype_read = wtap_full_file_read;
|
|
wth->subtype_seek_read = wtap_full_file_seek_read;
|
|
|
|
return WTAP_OPEN_MINE;
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|