134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/*
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* (C) 2013-2016 by Harald Welte <laforge@gnumonks.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include "protocol/protocol.h"
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#include "diag_io.h"
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#include "diagchar_hdlc.h"
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/* transmit a msgb containing a DIAG message over the given fd */
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int diag_transmit_msgb(struct diag_instance *di, struct msgb *msg)
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{
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int out_len, rc;
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uint8_t packet[DIAG_MAX_HDLC_BUF_SIZE];
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struct diag_send_desc_type send;
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struct diag_hdlc_dest_type enc = { NULL, NULL, 0 };
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send.state = DIAG_STATE_START;
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send.pkt = msgb_data(msg);
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send.last = msgb_data(msg) + msgb_length(msg) - 1;
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send.terminate = 1;
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enc.dest = packet;
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enc.dest_last = packet + sizeof(packet) - 1;
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diag_hdlc_encode(&send, &enc);
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out_len = (enc.dest - (void *)packet);
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rc = write(di->fd, packet, out_len);
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if (rc != out_len) {
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fprintf(stderr, "Short write on packet.\n");
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return -1;
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}
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msgb_free(msg);
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return 0;
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}
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/* transmit a message from a buffer (nto msgb) as DIAG over the given fd */
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int diag_transmit_buf(struct diag_instance *di, const uint8_t *data, size_t data_len)
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{
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struct msgb *msg = msgb_alloc(DIAG_MAX_REQ_SIZE, "DIAG Tx");
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memcpy(msg->tail, data, data_len);
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msgb_put(msg, data_len);
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return diag_transmit_msgb(di, msg);
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}
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int diag_read(struct diag_instance *di)
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{
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uint8_t buf[DIAG_MAX_HDLC_BUF_SIZE];
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struct diag_hdlc_decode_type hdlc_decode;
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struct msgb *msg;
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int rc;
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/* read raw data into buffer */
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rc = read(di->fd, buf, sizeof(buf));
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if (rc <= 0 ) {
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fprintf(stderr, "Short read!\n");
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return -EIO;
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}
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if (!di->rx.msg) {
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di->rx.msg = msgb_alloc(DIAG_MAX_REQ_SIZE, "DIAG Rx");
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di->rx.msg->l2h = di->rx.msg->tail;
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}
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msg = di->rx.msg;
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hdlc_decode.dest_ptr = msg->tail;
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hdlc_decode.dest_size = msgb_tailroom(msg);
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hdlc_decode.src_ptr = buf;
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hdlc_decode.src_size = rc;
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hdlc_decode.src_idx = 0;
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hdlc_decode.dest_idx = 0;
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rc = diag_hdlc_decode(&hdlc_decode);
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if (msgb_length(msg) + hdlc_decode.dest_idx > DIAG_MAX_REQ_SIZE) {
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fprintf(stderr, "Dropping packet. pkt_size: %d, max: %d\n",
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msgb_length(msg) + hdlc_decode.dest_idx,
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DIAG_MAX_REQ_SIZE);
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return -EIO;
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}
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msgb_put(msg, hdlc_decode.dest_idx);
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if (rc == HDLC_COMPLETE) {
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di->rx.msg = NULL;
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rc = crc_check(msgb_data(msg), msgb_length(msg));
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if (rc) {
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fprintf(stderr, "Bad CRC, dropping packet\n");
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msgb_free(msg);
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return -EINVAL;
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}
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msgb_get(msg, HDLC_FOOTER_LEN);
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if (msgb_length(msg) < 1) {
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fprintf(stderr, "Message too short, len: %u\n", msgb_length(msg));
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msgb_free(msg);
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return -EINVAL;
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}
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if (di->rx.rcvmsg)
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(di->rx.rcvmsg)(di, msg);
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else
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msgb_free(msg);
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}
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return 0;
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};
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