141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/* rfc7468.c
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*
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* Implements loading of files in the format specified by RFC 7468.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include "rfc7468.h"
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#include "file_wrappers.h"
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#include "wtap-int.h"
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#include <wsutil/buffer.h>
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#include <glib.h>
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#include <string.h>
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/* 128 bytes should be enough to contain any line. Strictly speaking, 64 is
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enough, but we provide some leeway to accommodate nonconformant producers and
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trailing whitespace. The 2 extra bytes are for the trailing newline and NUL
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terminator. */
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#define MAX_LINE_LENGTH (128 + 2)
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static int rfc7468_file_type_subtype = -1;
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void register_rfc7468(void);
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static char *read_complete_text_line(char line[MAX_LINE_LENGTH], FILE_T fh, int *err, gchar **err_info)
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{
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char *line_end;
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if (!(line_end = file_getsp(line, MAX_LINE_LENGTH, fh))) {
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*err = file_error(fh, err_info);
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return NULL;
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}
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if (strlen(line) != (size_t)(line_end - line)) {
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*err = 0;
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return NULL;
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}
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if (line_end[-1] != '\n' && !file_eof(fh)) {
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*err = 0;
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return NULL;
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}
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return line_end;
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}
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//
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// Arbitrary value - we don't want to read all of a huge non-RFC 7468 file
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// only to find no pre-encapsulation boundary.
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//
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#define MAX_EXPLANATORY_TEXT_LINES 20
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wtap_open_return_val rfc7468_open(wtap *wth, int *err, gchar **err_info)
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{
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gboolean found_preeb;
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static const char preeb_begin[] = "-----BEGIN ";
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char line[MAX_LINE_LENGTH];
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//
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// Skip up to MAX_EXPLANATORY_TEXT_LINES worth of lines that don't
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// look like pre-encapsulation boundaries.
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//
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found_preeb = FALSE;
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for (unsigned int i = 0; i < MAX_EXPLANATORY_TEXT_LINES; i++) {
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if (!read_complete_text_line(line, wth->fh, err, err_info)) {
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if (*err == 0 || *err == WTAP_ERR_SHORT_READ)
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return WTAP_OPEN_NOT_MINE;
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return WTAP_OPEN_ERROR;
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}
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// Does the line look like a pre-encapsulation boundary?
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if (memcmp(line, preeb_begin, sizeof preeb_begin - 1) == 0) {
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// Yes.
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found_preeb = TRUE;
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break;
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}
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}
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if (!found_preeb)
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return WTAP_OPEN_NOT_MINE;
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
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return WTAP_OPEN_ERROR;
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wth->file_type_subtype = rfc7468_file_type_subtype;
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wth->file_encap = WTAP_ENCAP_RFC7468;
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wth->snapshot_length = 0;
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wth->file_tsprec = WTAP_TSPREC_SEC;
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wth->subtype_read = wtap_full_file_read;
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wth->subtype_seek_read = wtap_full_file_seek_read;
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return WTAP_OPEN_MINE;
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}
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static const struct supported_block_type rfc7468_blocks_supported[] = {
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/*
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* This is a file format that we dissect, so we provide only one
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* "packet" with the file's contents, and don't support any
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* options.
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*/
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{ WTAP_BLOCK_PACKET, ONE_BLOCK_SUPPORTED, NO_OPTIONS_SUPPORTED }
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};
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static const struct file_type_subtype_info rfc7468_info = {
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"RFC 7468 files", "rfc7468", NULL, NULL,
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FALSE, BLOCKS_SUPPORTED(rfc7468_blocks_supported),
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NULL, NULL, NULL
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};
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void register_rfc7468(void)
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{
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rfc7468_file_type_subtype = wtap_register_file_type_subtype(&rfc7468_info);
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/*
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* Register name for backwards compatibility with the
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* wtap_filetypes table in Lua.
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*/
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wtap_register_backwards_compatibility_lua_name("RFC7468",
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rfc7468_file_type_subtype);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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