324 lines
7.9 KiB
C
324 lines
7.9 KiB
C
/*****************************************************************************
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* chdlc_api.c CHDLC API: Receive Module
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*
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* Author(s): Gideon Hack & Nenad Corbic <ncorbic@sangoma.com>
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*
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* Copyright: (c) 1995-2001 Sangoma Technologies Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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* ============================================================================
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* Description:
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*
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* The chdlc_api.c utility will bind to a socket to a chdlc network
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* interface, and continously tx and rx packets to an from the sockets.
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*
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* This example has been written for a single interface in mind,
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* where the same process handles tx and rx data.
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*
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* A real world example, should use different processes to handle
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* tx and rx spearately.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <linux/if_wanpipe.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <linux/wanpipe.h>
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#include <linux/sdla_chdlc.h>
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#include "lib_api.h"
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#define FALSE 0
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#define TRUE 1
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#define LGTH_CRC_BYTES 2
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#define MAX_TX_DATA 5000 /* Size of tx data */
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#define MAX_RX_DATA MAX_TX_DATA
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static unsigned char test_data[]={0x00,0x5A, 0xAA, 0xA5, 0xFF};
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static unsigned char tx_index=0;
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/*===================================================
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* Golobal data
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*==================================================*/
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unsigned short no_CRC_bytes_Rx;
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unsigned char HDLC_streaming = FALSE;
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unsigned short Rx_lgth;
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unsigned char Rx_data[MAX_RX_DATA];
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unsigned char Tx_data[MAX_TX_DATA];
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int sock;
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/*===================================================
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* Function Prototypes
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*==================================================*/
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int MakeConnection(void);
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void handle_socket( void);
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/*===================================================
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* MakeConnection
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*
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* o Create a Socket
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* o Bind a socket to a wanpipe network interface
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* (Interface name is supplied by the user)
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*==================================================*/
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int MakeConnection(void)
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{
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struct wan_sockaddr_ll sa;
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memset(&sa,0,sizeof(struct wan_sockaddr_ll));
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errno = 0;
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sock = socket(AF_WANPIPE, SOCK_RAW, 0);
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if( sock < 0 ) {
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perror("Socket");
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return(FALSE);
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} /* if */
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printf("\nConnecting to router %s, interface %s\n", card_name, if_name);
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strcpy( sa.sll_device, if_name);
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strcpy( sa.sll_card, card_name);
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sa.sll_protocol = htons(PVC_PROT);
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sa.sll_family=AF_WANPIPE;
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if(bind(sock, (struct sockaddr *)&sa, sizeof(struct wan_sockaddr_ll)) < 0){
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perror("bind");
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printf("Failed to bind a socket to %s interface\n",if_name);
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exit(0);
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}
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printf("Socket bound to %s\n\n",if_name);
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return(TRUE);
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}
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/*===========================================================
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* handle_socket
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*
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* o Tx/Rx data to and from the socket
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* o Cast received data to an api_rx_element_t data type
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* o The received packet contains 16 bytes header
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*
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* ------------------------------------------
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* | 16 bytes | X bytes ...
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* ------------------------------------------
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* Header Data
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*
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* RX DATA:
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* --------
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* Each rx data packet contains the 16 byte header!
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*
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* o Rx 16 byte data structure:
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*
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* typedef struct {
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* unsigned char error_flag PACKED;
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* unsigned short time_stamp PACKED;
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* unsigned char reserved[13] PACKED;
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* } api_rx_hdr_t;
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*
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* typedef struct {
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* api_rx_hdr_t api_rx_hdr PACKED;
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* void * data PACKED;
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* } api_rx_element_t;
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*
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* error_flag:
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* bit 0: incoming frame was aborted
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* bit 1: incoming frame has a CRC error
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* bit 2: incoming frame has an overrun eror
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*
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* time_stamp:
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* absolute time value in ms.
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*
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* TX_DATA:
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* --------
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* Each tx data packet MUST contain a 16 byte header!
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*
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* o Tx 16 byte data structure
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*
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* typedef struct {
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* unsigned char attr PACKED;
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* unsigned char reserved[15] PACKED;
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* } api_tx_hdr_t;
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*
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* typedef struct {
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* api_tx_hdr_t api_tx_hdr PACKED;
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* void * data PACKED;
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* } api_tx_element_t;
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*
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* Currently the chdlc device driver doesn't use any of
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* the above fields. Thus, the user can set the 16 bytes
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* to ZERO.
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*
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*/
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void handle_socket(void)
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{
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unsigned int Rx_count,Tx_count,Tx_length;
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api_rx_element_t* api_rx_el;
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fd_set ready,oob;
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int err,i;
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void *pRx_data,*pTx_data;
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int no_CRC_bytes_Rx = LGTH_CRC_BYTES;
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pRx_data = (void*)&Rx_data[sizeof(api_rx_hdr_t)];
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pTx_data = (void*)&Tx_data[sizeof(api_tx_hdr_t)];
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Rx_count = 0;
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Tx_count = 0;
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Tx_length = tx_size;
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printf("\n\nSocket Handler: Rx=%d Tx=%i TxCnt=%i TxLen=%i TxDelay=%i RxCnt=%i\n",
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read_enable,write_enable,tx_cnt,tx_size,tx_delay,rx_cnt);
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/* If running HDLC_STREAMING then the received CRC bytes
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* will be passed to the application as part of the
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* received data.
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*/
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for(;;) {
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FD_ZERO(&ready);
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FD_ZERO(&oob);
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FD_SET(sock,&oob);
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FD_SET(sock,&ready);
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fflush(stdout);
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if(select(sock + 1,&ready, NULL, &oob, NULL)){
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if (FD_ISSET(sock,&oob)){
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err = recv(sock, Rx_data, MAX_RX_DATA, MSG_OOB);
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if(err < 0 ) {
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printf("Failed to receive OOB %i , %i\n", Rx_count, err);
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err = ioctl(sock,SIOC_WANPIPE_SOCK_STATE,0);
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printf("Sock state is %s\n",
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(err == 0) ? "CONNECTED" :
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(err == 1) ? "DISCONNECTED" :
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"CONNECTING");
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break;
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}
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printf("Got OOB exception: Link Down !\n");
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break;
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}
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if (FD_ISSET(sock,&ready)){
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err = recv(sock, Rx_data, MAX_RX_DATA, 0);
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/* err indicates bytes received */
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if (err > 0){
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api_rx_el = (api_rx_element_t*)&Rx_data[0];
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/* Check the packet length */
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Rx_lgth = err - sizeof(api_rx_hdr_t)-no_CRC_bytes_Rx;
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if(Rx_lgth<=0) {
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printf("\nShort frame received (%d)\n",
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Rx_lgth);
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return;
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}
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switch (api_rx_el->api_rx_hdr.error_flag){
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case 0:
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/* Rx packet is good */
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break;
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case RX_FRM_ABORT:
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/* Frame was aborted */
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break;
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case RX_FRM_CRC_ERROR:
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/* Frame has crc error */
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break;
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case RX_FRM_OVERRUN_ERROR:
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/* Frame has an overrun error */
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break;
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default:
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/* Error with the rx packet
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* handle it ... */
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break;
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}
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++Rx_count;
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for (i=0;i<Rx_lgth;i++){
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if (((unsigned char*)api_rx_el->data)[i] !=
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test_data[tx_index]){
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printf("Rx Error cnt=%i: Packet corruption on offset %i\n",
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Rx_count,i);
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goto process_exit;
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}
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}
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if (Rx_count == tx_cnt){
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Rx_count=0;
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tx_index++;
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if (tx_index >=sizeof(test_data)){
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tx_index=0;
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}
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}
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err = send(sock,Rx_data,err-2,0);
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if (err <= 0){
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printf("Failed to Tx Echo Data!\n");
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}
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} else {
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printf("\nError receiving data\n");
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break;
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}
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}
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}
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}
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process_exit:
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close (sock);
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}
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/***************************************************************
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* Main:
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*
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* o Make a socket connection to the driver.
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* o Call handle_socket() to read/write the socket
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*
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**************************************************************/
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int main(int argc, char* argv[])
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{
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int proceed;
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proceed=init_args(argc,argv);
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if (proceed != WAN_TRUE){
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usage(argv[0]);
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return -1;
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}
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proceed = MakeConnection();
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if(proceed == WAN_TRUE){
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handle_socket();
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return 0;
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}
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return 1;
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};
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