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wanpipe/api/legacy/x25/server_v1.c

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/*****************************************************************************
* server_v1.c X25 API: SVC Server Application
*
* Author(s): Nenad Corbic <ncorbic@sangoma.com>
*
* Copyright: (c) 1995-2001 Sangoma Technologies Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
* ============================================================================
*
* Description:
*
* The server_v1.c utility will accept, user defined number, of
* outgoing calls and tx/rx, user defined number, of packets on each
* active svc.
*
* The server_v1 architecture is the classic mulit-process server,
* that spawns a child process in order to handle incoming connections.
*
* IMPORTANT: For large number of LCN's, please refer to the P-Thread
* server example pthread/ directory. The thread based
* architecture model is a much more scalable solution.
*
* This utility should be used as an architectual model. It is up to
* the user to handle all conditions of x25. Please refer to the
* X25API programming manual for futher details.
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <time.h>
#include <netinet/in.h>
#include <linux/if_wanpipe.h>
#include <string.h>
#include <errno.h>
#include <linux/wanpipe.h>
#include <linux/sdla_x25.h>
#include <linux/if_ether.h>
#define FALSE 0
#define TRUE 1
#define MIN_FRM_LGTH 100
#define MAX_FRM_LGTH 1400
#define NO_FRMS_TO_TX 1000
#define MAX_X25_ADDR_SIZE 16
#define MAX_X25_DATA_SIZE 129
#define MAX_X25_FACL_SIZE 110
unsigned char Tx_data[MIN_FRM_LGTH + sizeof(x25api_hdr_t)];
unsigned char Rx_data[1000];
/* Prototypes */
int MakeConnection( char * );
void process_con(int,int);
void sig_chld (int sigio);
void handle_oob_event(x25api_t* api_hdr, int sock);
/***************************************************************
* Main:
*
* o Make a socket connection to the driver.
* o Call process_con() to transmit data
*
**************************************************************/
int main(int argc, char* argv[])
{
if (argc != 2){
printf("Usage: ./server <card name>\n");
exit(0);
}
signal(SIGCHLD,&sig_chld);
MakeConnection(argv[argc-1]);
return 0;
};
/***************************************************
* MakeConnection
*
* o Create a Socket
* o Bind a socket to a wanpipe network interface
*
* IMPORTANT:
* No signals are allowed in this part of the code.
* Accept ioctl call, blocks and waits on a
* signal which indicates that command is accepted.
* If external signal tries to wake up the application
* the accept ioctl call will wake up and fail the connection.
*
* This will be fixed in future releases.
*/
int MakeConnection (char *i_name )
{
int err = 0;
int sock, sock1;
struct wan_sockaddr_ll sa;
x25api_t api_cmd;
fd_set oob,readset;
errno = 0;
memset(&sa,0,sizeof(struct wan_sockaddr_ll));
/* Create a new socket */
sock = socket( AF_WANPIPE, SOCK_RAW, 0);
if( sock < 0 ) {
perror("Socket");
return FALSE;
}
/* Fill in binding information.
* Before we use listen() system call
* a socket must be binded into a virtual
* network interface svc_listen.
*
* Card name must be supplied as well. In
* this case the user supplies the name
* eg: wanpipe1.
*/
sa.sll_family = AF_WANPIPE;
sa.sll_protocol = htons(0x16);
strcpy(sa.sll_device, "svc_listen");
strcpy(sa.sll_card, i_name);
/* Bind a sock using the above address structure */
if(bind(sock, (struct sockaddr *)&sa, sizeof(struct wan_sockaddr_ll)) == -1){
perror("bind");
printf("Failed to bind socket to %s interface\n",i_name);
return FALSE;
}
/* Put the sock into listening mode. Number 10 does not
* mean anything, since number of connections is depended
* on number of LCNs configured */
listen(sock,10);
for (;;){
sock1=-1;
FD_ZERO(&readset);
FD_ZERO(&oob);
FD_SET(sock,&readset);
FD_SET(sock,&oob);
/* IMPORATAN: We use select() to wait for an incoming call
* instead of just calling accept(), because the child
* exit would trigger a CHILD signal which we will catch
* in order to clear the process status, however this signal
* would also wake up accept() system call. */
if (select(sock+1,&readset,NULL,&oob,NULL) > 0){
if (FD_ISSET(sock,&oob)){
printf("OOB Msg on listen Sock State %i !\n",
ioctl(sock,SIOC_WANPIPE_SOCK_STATE,0));
/* The X25 link went down or the driver is
* in process of shutting down. Use listen()
* to try to rebind to the x25 layer, and wait
* until it comes up. If listen() fails the
* driver is in shutdown process. */
/* Run listen() and try to rebind to the
* driver */
if (listen(sock,10) == 0){
/* Listen successful: Listen socket will stay
* connected to the x25 layer until it
* comes back up. */
continue;
}
printf("Listen closing on OOB: Sock State %i !\n",
ioctl(sock,SIOC_WANPIPE_SOCK_STATE,0));
/* Failed to listen(), the wanpipe
* driver is shutting down. Thus
* get out. */
close(sock);
break;
}
if (FD_ISSET(sock,&readset)){
/* Accept call will block and wait for incoming calls.
* When a call comes in, a new socket will be created
* sock1. NOTE: that connection is not established yet.*/
sock1 = accept(sock,NULL,NULL);
}
}else{
continue;
}
if (sock1 < 0){
printf ("Sock Accept Call Failed! %i\n",sock1);
continue;
}
/* Reset the api command structure */
memset(&api_cmd, 0, sizeof(x25api_t));
/* The GET CALL DATA ioctl call will write in the
* incoming call data into api_cmd structure. Once
* we have call data information, it is up to the
* user to accept or clear call. */
if ((err=ioctl(sock1,SIOC_WANPIPE_GET_CALL_DATA,&api_cmd)) < 0){
perror("GET CALL");
printf ("Get Call Data Failed %i\n",err);
close(sock1);
continue;
}else{
printf("Call data: Lcn %i, Data %s\n",
api_cmd.hdr.lcn,api_cmd.data);
}
/* In this case, I accept all calls.
* The ACCEPT CALL ioctl will acknowledge connecton */
/* The user can send data along with the call accept
* indication, by submiting a filled in api_cmd
* structure in the third field of the ioctl call. */
if ((err=ioctl(sock1,SIOC_WANPIPE_ACCEPT_CALL,0)) != 0){
printf("Accept failed %i\n",err);
close(sock1);
continue;
}else{
printf("Accept OK %i\n",api_cmd.hdr.lcn);
}
/* If the call is accepted, fork a child to service
* the call */
if (!fork()){
close(sock);
printf("CHILD Sock State %i CMD %i!\n",
ioctl(sock1,SIOC_WANPIPE_SOCK_STATE,0),
SIOC_WANPIPE_SOCK_STATE);
process_con(sock1,api_cmd.hdr.lcn);
exit(0);
}
close(sock1);
}
return TRUE;
}
/***************************************************
* process_con
*
* o Send and Receive data via socket
* o Create a tx packet using x25api_t data type.
* o Both the tx and rx packets contains 16 bytes headers
* in front of the real data. It is the responsibility
* of the applicatino to insert this 16 bytes on tx, and
* remove the 16 bytes on rx.
*
* ------------------------------------------
* | 16 bytes | X bytes ...
* ------------------------------------------
* Header Data
*
* o 16 byte Header: data structure:
*
* typedef struct {
* unsigned char qdm PACKED; Q/D/M bits
* unsigned char cause PACKED; cause field
* unsigned char diagn PACKED; diagnostics
* unsigned char pktType PACKED;
* unsigned short length PACKED;
* unsigned char result PACKED;
* unsigned short lcn PACKED;
* char reserved[7] PACKED;
* }x25api_hdr_t;
*
* typedef struct {
* x25api_hdr_t hdr PACKED;
* char data[X25_MAX_DATA] PACKED;
* }x25api_t;
*
* TX DATA:
* --------
* Each tx data packet must contain the above 16 byte header!
*
* Only relevant byte in the 16 byte tx header, is the
* QDM byte. The driver will look at this byte to determine
* if the Mbit (more data bit) should be set.
*
* QDM: byte is a bit map of three bits:
*
* Q bit: Bit 2 : Qualifier bit, special kind of packet.
* Can be used as control packet.
* D bit: Bit 1 : Data acknolwedge bit. The remote will
* acknowledge every packet sent.
* M bit: Bit 0 : If your packet is greater than x25 MTU,
* i.e 1024 bytes, than cut the packet to MTU size
* and set the M bit to indicate more data.
*
* RX DATA:
* --------
* Each rx data will contain the above 16 byte header!
*
* Relevant bytes in the 16 byte rx header, are the
* LCN and QDM bytes.
*
* QDM: byte is a bit map of three bits:
*
* Q bit: Bit 2 : Qualifier bit, special kind of packet.
* Can be used as control packet.
* D bit: Bit 1 : Data acknolwedge bit. The remote will
* acknowledge every packet sent.
* M bit: Bit 0 : If your packet is greater than x25 MTU,
* i.e 1024 bytes, than cut the packet to MTU size
* and set the M bit to indicate more data.
*
* LCN = contains the lcn number for the rx frame.
*
* OOB DATA:
* ---------
* The OOB (out of band) data is used by the driver to
* indicate x25 events for the active channel:
* clear call, or restarts.
*
* Each OOB packet contains the above 16 byte header!
*
* Relevant bytes in the 16 byte oob header, are the
* pktType, cause and diagn bytes.
*
* pktType = event type (ex Clear Call, Restart ...)
* cause = x25 cause of the event
* diagn = x25 diagnostic information used to determine
* the cause of the event.
*
* Upon receiving an event, the sock should be considered
* DEAD!!! Meaning it must be closed using the close()
* function.
*/
void process_con(int sock1, int lcn)
{
unsigned int Tx_count=0, Rx_count=0;
unsigned short Tx_lgth;
x25api_t* api_tx_el;
int err=0, i=0;
fd_set writeset, readset, oobset;
x25api_t api_cmd;
memset(&api_cmd, 0, sizeof(x25api_t));
/* Initialize the tx packet length */
Tx_lgth = MIN_FRM_LGTH;
/* Cast the x25 16 byte header to the begining
* of the tx packet. Using the pointer fill
* in appropriate header information such as
* QDM bits */
api_tx_el = (x25api_t *)Tx_data;
/* Initialize the 16 byte tx header */
memset(api_tx_el, 0, sizeof(x25api_hdr_t));
/* Set the Mbit (more bit)
* currently this option is disabled */
#ifdef _MORE_BIT_SET_
api_tx_el->hdr.qdm = 0x01
#endif
/* Fill in the tx packet data with arbitrary
* information */
for (i=0; i<Tx_lgth ; i++){
api_tx_el->data[i] = (unsigned char) i;
}
/* Start an infinite loop which will tx/rx data
* over connected x25 svc's */
for(;;) {
FD_ZERO(&writeset);
FD_ZERO(&oobset);
FD_ZERO(&readset);
//FD_SET(sock1,&writeset);
FD_SET(sock1,&oobset);
FD_SET(sock1,&readset);
/* The select function must be used to implement flow control.
* WANPIPE socket will block the user if the socket cannot send
* or there is nothing to receive.
*
* By using the last socket file descriptor +1 select will wait
* for all active x25 sockets.
*
* If the NONBLOCKING option has been used during connect()
* the select will wait untill the channel is connected
* (i.e. accept has been received). Once the channel is connected
* the tx and rx will start. However, if the call is cleared for
* any reason, the OOB message will indicate that event.
*/
if(select(sock1 + 1, &readset, &writeset, &oobset, NULL)){
if (FD_ISSET(sock1, &oobset)){
/* The OOB Message will indicate that an
* asynchronous event occured. The applicaton
* must stop everything and check the state of
* the link. Since link might
* have gone down */
/* In this example I just exit. A real
* application would check the state of the
* sock first by reading the header information.
*/
/* IMPORTANT:
* If we fail to read the OOB message, we can
* assume that the link is down. Thus, close
* the socket and continue !!! */
err = recv(sock1, Rx_data,
sizeof(Rx_data), MSG_OOB);
/* err contains number of bytes transmited */
if(err < 0 ) {
/* SVC is disconnected */
printf("Failed to read OOB %i , %i\n",
Tx_count, err);
break;
}else{
api_tx_el = (x25api_t *)Rx_data;
handle_oob_event(api_tx_el,sock1);
break;
}
}
if (FD_ISSET(sock1, &writeset)){
/* This socket is ready to tx */
/* The tx packet length contains the 16 byte
* header. The tx packet was created above. */
err = send(sock1, Tx_data,
Tx_lgth+sizeof(x25api_hdr_t), 0);
/* err contains number of bytes transmited */
if(err > 0 ) {
printf("Child LCN %i Packet Sent OK %i\n",
lcn,++Tx_count);
}
/* If err<=0 it means that the send failed and that
* driver is busy. Thus, the packet should be
* requeued for re-transmission on the next
* try !!!!
*/
}
if (FD_ISSET(sock1, &readset)){
/* If there are pending rx packets
* for a LISTEN socket, it means that
* calls are pending. Thus, accept
* a pending call */
err = recv(sock1, Rx_data, sizeof(Rx_data), 0);
/* err contains number of bytes transmited */
if(err < 0 ) {
printf("Failed to rcv %i , %i\n",
Rx_count, err);
}else{
x25api_hdr_t *api_data =
(x25api_hdr_t *)Rx_data;
if (api_data->qdm & 0x01){
/* More bit is set, thus
* handle it accordingly */
}
printf("\tReceive OK, size: %i, qdm %x,"
" cause %x, diagn %x, cnt: %i\n",
err, api_data->qdm,
api_data->cause,
api_data->diagn, ++Rx_count);
}
}
#if 0
/* Stop after number of frames */
if(Tx_count == NO_FRMS_TO_TX){
/* Clear a call using CLEAR_CALL ioctl function.
* User can send data along with the clear
* indication by submitting x25api_t structure
* in the third field of the ioctl call */
memset(&api_cmd,0,sizeof(x25api_t));
while(1){
api_cmd.hdr.qdm = 0x80;
if ((err=ioctl(sock1,SIOC_WANPIPE_CLEAR_CALL,&api_cmd)) == 0){
printf("Clear Call OK sock %i\n",lcn);
break;
}
if (ioctl(sock1,SIOC_WANPIPE_SOCK_STATE,0) == 1){
/* Sock is disconnected */
break;
}
usleep(100);
}
break;
}
#endif
}//if select
}//For
close(sock1);
return;
}
void sig_chld (int sigio)
{
pid_t pid;
int stat;
while ((pid=waitpid(-1,&stat,WNOHANG)) > 0){
printf("Child %d terminated\n",pid);
}
return;
}
void handle_oob_event(x25api_t* api_hdr, int sock)
{
switch (api_hdr->hdr.pktType){
case ASE_RESET_RQST:
printf("SockId=%i : OOB : Rx Reset Call : Lcn=%i : diag=0x%02X : cause=0x%02X\n",
sock,
api_hdr->hdr.lcn,
api_hdr->hdr.diagn,
api_hdr->hdr.cause);
/* NOTE: we don't have to close the socket,
* since the reset doesn't clear the call
* however, it means that there is something really
* wrong and that data has been lost */
return;
case ASE_CLEAR_RQST:
printf("SockId=%i : OOB : Rx Clear Call : Lcn=%i : diag=0x%02X : cause=0x%02X\n",
sock,
api_hdr->hdr.lcn,
api_hdr->hdr.diagn,
api_hdr->hdr.cause);
break;
case ASE_RESTART_RQST:
printf("SockId=%i : OOB : Rx Restart Req : Lcn=%i : diag=0x%02X : cause=0x%02X\n",
sock,
api_hdr->hdr.lcn,
api_hdr->hdr.diagn,
api_hdr->hdr.cause);
break;
case ASE_INTERRUPT:
printf("SockId=%i : OOB : Rx Interrupt Req : Lcn=%i : diag=0x%02X : cause=0x%02X\n",
sock,
api_hdr->hdr.lcn,
api_hdr->hdr.diagn,
api_hdr->hdr.cause);
break;
default:
printf("SockId=%i : OOB : Rx Type=0x%02X : Lcn=%i : diag=0x%02X : cause=0x%02X\n",
sock,
api_hdr->hdr.pktType,
api_hdr->hdr.lcn,
api_hdr->hdr.diagn,
api_hdr->hdr.cause);
break;
}
}
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