129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/*
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* Copyright (C) 2012 Martin Willi
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* Copyright (C) 2012 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "pt_tls.h"
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#include <utils/debug.h>
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/**
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* Described in header.
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*/
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void libpttls_init(void)
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{
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/* empty */
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}
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/*
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* PT-TNC Message format:
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* 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reserved | Message Type Vendor ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Message Type |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Message Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Message Identifier |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Message Value (e.g. PB-TNC Batch) . . . |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/**
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* Read a chunk of data from TLS, returning a reader for it
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*/
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static bio_reader_t* read_tls(tls_socket_t *tls, size_t len)
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{
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ssize_t got, total = 0;
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char *buf;
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buf = malloc(len);
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while (total < len)
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{
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got = tls->read(tls, buf + total, len - total, TRUE);
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if (got <= 0)
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{
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free(buf);
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return NULL;
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}
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total += got;
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}
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return bio_reader_create_own(chunk_create(buf, len));
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}
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/**
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* Read a PT-TLS message, return header data
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*/
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bio_reader_t* pt_tls_read(tls_socket_t *tls, u_int32_t *vendor,
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u_int32_t *type, u_int32_t *identifier)
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{
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bio_reader_t *reader;
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u_int32_t len;
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u_int8_t reserved;
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reader = read_tls(tls, PT_TLS_HEADER_LEN);
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if (!reader)
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{
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return NULL;
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}
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if (!reader->read_uint8(reader, &reserved) ||
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!reader->read_uint24(reader, vendor) ||
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!reader->read_uint32(reader, type) ||
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!reader->read_uint32(reader, &len) ||
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!reader->read_uint32(reader, identifier))
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{
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reader->destroy(reader);
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return NULL;
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}
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reader->destroy(reader);
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if (len < PT_TLS_HEADER_LEN)
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{
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DBG1(DBG_TNC, "received short PT-TLS header (%d bytes)", len);
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return NULL;
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}
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return read_tls(tls, len - PT_TLS_HEADER_LEN);
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}
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/**
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* Prepend a PT-TLS header to a writer, send data, destroy writer
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*/
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bool pt_tls_write(tls_socket_t *tls, bio_writer_t *writer,
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pt_tls_message_type_t type, u_int32_t identifier)
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{
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bio_writer_t *header;
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ssize_t len;
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chunk_t data;
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data = writer->get_buf(writer);
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len = PT_TLS_HEADER_LEN + data.len;
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header = bio_writer_create(len);
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header->write_uint8(header, 0);
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header->write_uint24(header, 0);
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header->write_uint32(header, type);
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header->write_uint32(header, len);
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header->write_uint32(header, identifier);
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header->write_data(header, data);
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writer->destroy(writer);
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data = header->get_buf(header);
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len = tls->write(tls, data.ptr, data.len);
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header->destroy(header);
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return len == data.len;
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}
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