WebSVN - shark - Rev 1618 - /shark/branches/xen/ports/tftp/tftp.c

/*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/

#include <kernel/func.h>
#include <kernel/kern.h>
#include <stdlib.h>
#include <stdio.h>
#include "string.h"

#include "drivers/udpip.h"

#include "tftp.h"
#include "endn.h"

/* */
#include "sem/sem/sem.h"

char local_ip_addr[20];
char host_ip_addr[20];

/* The value is incremented when assigning a new port address to a new
* connection.
*/
int port_counter;

/* The fixed IP/port (=69) to submit the connection requesting */
UDP_ADDR connection_request;

TFTP_MODEL model[MAX_CONCURRENT_STREAM];
sem_t *model_sem[MAX_CONCURRENT_STREAM];

TFTP_BUFFER buffer[MAX_CONCURRENT_STREAM];
//QUEUE queue[MAX_CONCURRENT_STREAM];
sem_t *buffer_sem[MAX_CONCURRENT_STREAM];

WORD tftp_get_data(TFTP_PACKET *pkt, BYTE *data, int n) {
memcpy(data, pkt->u.data.data, n);
return(pkt->u.data.block);
}

int tftp_get_ack_block(TFTP_PACKET *pkt) {
return(pkt->u.ack.block);
}

int tftp_get_error(TFTP_PACKET *pkt, char *errmsg) {
strcpy(errmsg, pkt->u.err.errmsg);
return(pkt->u.err.errcode);
}

/* Returns the packet opcode.
*/
int tftp_get_opcode(TFTP_PACKET *pkt) {
WORD tmp;
tmp = pkt->opcode;
SWAP_SHORT(tmp); /* Swap endian!! */
return(tmp);
}

int tftp_fill_request(TFTP_PACKET *pkt, WORD opcode, const BYTE *filename, const BYTE *mode) {
int i, j;

pkt->opcode = opcode; /* Put the opcode in the right struct field */
SWAP_SHORT(pkt->opcode); /* Swap endian!! */

/* Reset the filename field */
memset(pkt->u.request.filename, 0, sizeof(pkt->u.request.filename));

/* Concats the containing filename and mode NULL terminatd strings in the filename field */
for (i = 0; i < strlen(filename); i++)
pkt->u.request.filename[i] = filename[i];
pkt->u.request.filename[i] = '\0';
for (j = 0, i = i + 1; j < strlen(mode); i++, j++)
pkt->u.request.filename[i] = mode[j];
pkt->u.request.filename[i] = '\0';

return(0);
}

int tftp_fill_data(TFTP_PACKET *pkt, WORD nblock, BYTE *rawdata, WORD datasize) {
if (datasize > TFTP_DATA_SIZE) { return(1); } /* Overflow checking */

pkt->opcode = TFTP_DATA; /* Put the DATA opcode in the opcode field */
SWAP_SHORT(pkt->opcode); /* Swap endian!! */

pkt->u.data.block = nblock;
SWAP_SHORT(pkt->u.data.block); /* Swap endian!! */

memcpy(pkt->u.data.data, rawdata, datasize); /* ??? Maybe some data manipulation required!!! */
return(0);
}

int tftp_fill_ack(TFTP_PACKET *pkt, WORD nblock) {
pkt->opcode = TFTP_ACK; /* Put the ACK opcode in the opcode field */
SWAP_SHORT(pkt->opcode); /* Swap endian!! */

pkt->u.ack.block = nblock;
return(0);
}

void tftp_reset_handle(int h) {
model[h].status = TFTP_NOT_CONNECTED;
model[h].errcode = TFTP_NO_ERROR;
model[h].handle = -1;
model[h].sender_pid = -1;
model[h].receiver_pid = -1;
model[h].nblock = 0;
model[h].waiting_ack = 0;
model[h].timestamp = 0;
model[h].timeout = TFTP_DEFAULT_TIMEOUT;
model[h].ntimeout = TFTP_DEFAULT_TIMEOUT_NUMBER;

buffer[h].data = NULL;
buffer[h].size = 0;
buffer[h].nbytes = 0;

model_sem[h] = NULL;
buffer_sem[h] = NULL;
}

int tftp_init() {
int i;

for (i = 0; i < MAX_CONCURRENT_STREAM; i++) {
tftp_reset_handle(i);
}

port_counter = 0;

return(0);
}

int tftp_net_start(char *local_ip, char *host_ip, int init_net) {
struct net_model m = net_base;
int netval;

/* Save IPs locally */
strcpy(local_ip_addr, local_ip);
strcpy(host_ip_addr, host_ip);

netval = 0;

if (init_net) {
net_setmode(m, TXTASK); /* We want a task for TX mutual exclusion */
net_setudpip(m, local_ip,"255.255.255.255"); /* We use UDP/IP stack */

/* OK: let's start the NetLib! */
netval = net_init(&m);
}

return(netval);
}

int tftp_setup_timeout(int h, int sec) {
if (model[h].handle != TFTP_NOT_CONNECTED) return(-1);
model[h].timeout = sec * 1000000;
return(0);
}

int tftp_set_timeout_numbers(int h, int n) {
if (model[h].handle != TFTP_NOT_CONNECTED) return(-1);
model[h].ntimeout = n;
return(0);
}

int tftp_open(char *fname) {
int i;

/* Finds the first free connection slot */
for (i = 0; i < MAX_CONCURRENT_STREAM; i++)
if (model[i].status == TFTP_NOT_CONNECTED) break;
if (i >= MAX_CONCURRENT_STREAM) return(-1); /* No connection slots available */

model[i].handle = i; /* Handle = index in the struct array */
strcpy(model[i].filename, fname); /* Save filename into struct */
model[i].status = TFTP_OPEN; /* Connection opened */
sem_init(model_sem[i], 0, 1);

return(i);
}

TASK upload_sender(int id) {
TFTP_PACKET pkt;
char data[TFTP_DATA_SIZE];
int mystatus;
int i, n;

i = 0;
while(1) {
sem_wait(model_sem[id]);

if (model[id].waiting_ack) { /* and status != error ??? */
if (sys_gettime(NULL) - model[id].timestamp >= model[id].timeout) { /* ??? check it!!! */
if (!model[id].ntimeout) {
model[id].status = TFTP_ERR;
model[id].errcode = TFTP_ERR_TIMEOUT;
sem_post(model_sem[id]);
} else {
model[id].ntimeout--;
model[id].timestamp = sys_gettime(NULL);
sem_post(model_sem[id]);
udp_sendto(model[id].socket, (char*)(&model[id].last_sent), sizeof(TFTP_PACKET), &model[id].host);
}
} else {
sem_post(model_sem[id]);
}
} else {
mystatus = model[id].status;
sem_post(model_sem[id]);

switch (mystatus) {
case TFTP_ACTIVE : {

/* Doesn't use mutex 'cause uses "static" model fields */
tftp_fill_request(&pkt, TFTP_WRITE_REQUEST, model[id].filename, TFTP_OCTET_MODE);
udp_sendto(model[id].socket, (char*)(&pkt), sizeof(TFTP_PACKET), &connection_request);
memcpy(&model[id].last_sent, &pkt, sizeof(TFTP_PACKET)); /* Save the last sent packet for retransmission */

sem_wait(model_sem[id]);
if (model[id].status != TFTP_ERR)
model[id].status = TFTP_CONNECTION_REQUESTING;
else {
sem_post(model_sem[id]);
break;
}
model[id].waiting_ack = 1;
model[id].timestamp = sys_gettime(NULL);
sem_post(model_sem[id]);

break;
}
case TFTP_CONNECTION_REQUESTING : {
}
case TFTP_STREAMING : {
if (tftp_usedbuffer(id) >= TFTP_DATA_SIZE) {
n = tftp_get(id, data, TFTP_DATA_SIZE);
tftp_fill_data(&pkt, model[id].nblock, data, n);

udp_sendto(model[id].socket, (char*)(&pkt), sizeof(TFTP_PACKET), &model[id].host);
memcpy(&model[id].last_sent, &pkt, sizeof(TFTP_PACKET)); /* Save the last sent packet for retransmission */

sem_wait(model_sem[id]);
model[id].waiting_ack = 1;
model[id].timestamp = sys_gettime(NULL);
sem_post(model_sem[id]);
}
break;
}
case TFTP_FLUSHING : {
n = tftp_usedbuffer(id);
if (n >= TFTP_DATA_SIZE) {

/* Get data for a full data packet */
n = tftp_get(id, data, TFTP_DATA_SIZE);
tftp_fill_data(&pkt, model[id].nblock, data, n);

udp_sendto(model[id].socket, (char*)(&pkt), sizeof(TFTP_PACKET), &model[id].host);
memcpy(&model[id].last_sent, &pkt, sizeof(TFTP_PACKET)); /* Save the last sent packet for retransmission */

sem_wait(model_sem[id]);
model[id].waiting_ack = 1;
model[id].timestamp = sys_gettime(NULL);
sem_post(model_sem[id]);
} else {

/* Get remaining data from buffer */
n = tftp_get(id, data, n);
tftp_fill_data(&pkt, model[id].nblock, data, n);

/* Sending 4 extra bytes for opcode and block number!! */
udp_sendto(model[id].socket, (char*)(&pkt), sizeof(n + 4), &model[id].host);

/* Don't wait for ack!! Maybe will be implemented later... */
task_kill(model[id].receiver_pid);
/* ..... */
task_abort(NULL);
}
break;
}

case TFTP_ERROR : {
break;
}
}
}

task_testcancel();
task_endcycle();
}
return(0);
}

/* This non real-time task reads UDP packets with ACK from the network
*/
TASK upload_receiver(int id) {
char msg[200];
int mystatus;
int n;
int i;
WORD opcode;
TFTP_PACKET pkt;
UDP_ADDR server;

i = 0;
while (1) {
sem_wait(model_sem[id]);
mystatus = model[id].status;
sem_post(model_sem[id]);

if (mystatus != TFTP_ERR) {
n = udp_recvfrom(model[id].socket, &pkt, &server);
opcode = tftp_get_opcode(&pkt);

if (opcode == TFTP_ERROR) {
n = tftp_get_error(&pkt, msg); // re-use n: not too orthodox...

sem_wait(model_sem[id]);
model[id].status = TFTP_ERR;
model[id].errcode = n;
strcpy(model[id].errmsg, msg);
sem_post(model_sem[id]);

} else {
switch (mystatus) {
case TFTP_NOT_CONNECTED : {
// discard the packet... set error??
break;
}
case TFTP_CONNECTION_REQUESTING : {
sem_wait(model_sem[id]);
memcpy(&model[id].host, &server, sizeof(model[id].host));
model[id].waiting_ack = 0;
model[id].status = TFTP_STREAMING;
model[id].nblock++;
sem_post(model_sem[id]);

break;
}
case TFTP_STREAMING : {
// check the nblock on the arrived packet

sem_wait(model_sem[id]);
model[id].waiting_ack = 0;
model[id].nblock++;
sem_post(model_sem[id]);
break;
}
}
}
}
i++;
}

return(0);
}

int tftp_upload(int i, unsigned long buffsize, sem_t *mtx) {
SOFT_TASK_MODEL soft_m;
NRT_TASK_MODEL nrt_m;

if ((buffer_sem[i] = mtx) == NULL) return(-3); /* ??? check assignment!!! */

if ((buffer[i].size = buffsize) > MAX_BUFFER_SIZE) return(-2); /* Buffer size too large */
if ((buffer[i].data = malloc(buffsize)) == NULL) return(-4); /* Buffer allocation error */
buffer[i].nbytes = 0;

/* Create a socket for transmission */
ip_str2addr(local_ip_addr, &(model[i].local.s_addr));
model[i].local.s_port = BASE_PORT + port_counter; /* Different port for each connection */
port_counter++;

ip_str2addr(host_ip_addr, &(connection_request.s_addr));
connection_request.s_port = 69; /* It is fixed for the connection request */

model[i].socket = udp_bind(&model[i].local, NULL);

/* First we set the sender's task properties... */
soft_task_default_model(soft_m);
soft_task_def_level(soft_m, 0);
soft_task_def_arg(soft_m, (void *)(i));
soft_task_def_group(soft_m, i);
soft_task_def_periodic(soft_m);
soft_task_def_wcet(soft_m, TFTP_UPLOAD_SENDER_WCET);
soft_task_def_period(soft_m, TFTP_UPLOAD_SENDER_PERIOD);
soft_task_def_met(soft_m, TFTP_UPLOAD_SENDER_MET);

model[i].sender_pid = task_create("upload_sender", upload_sender, &soft_m, NULL);

if (model[i].sender_pid == -1) {
free(buffer[i].data);
tftp_reset_handle(i);
return(-5);
}

nrt_task_default_model(nrt_m); /* Start the receiver task... */
nrt_task_def_arg(nrt_m, (void *)(i));
if ((model[i].receiver_pid = task_create("upload_receiver", upload_receiver, &nrt_m, NULL)) == NIL) {
free(buffer[i].data);
tftp_reset_handle(i);
return(-6);
}

model[i].status = TFTP_ACTIVE; /* Connection active */
if (task_activate(model[i].sender_pid) == -1) {
free(buffer[i].data);
tftp_reset_handle(i);
return(-7);
}
if (task_activate(model[i].receiver_pid) == -1) {
free(buffer[i].data); // Maybe not correct... sys_panic() may be better
tftp_reset_handle(i);
return(-8);
}

return(0);
}

int tftp_download(int i, unsigned long buffsize, sem_t *mtx) {
return(0);
}

int tftp_close(int h, int hardness) {
TFTP_PACKET pkt;

if (hardness == TFTP_STOP_NOW) {
task_kill(model[h].sender_pid);
task_kill(model[h].receiver_pid);
tftp_fill_data(&pkt, model[h].nblock, NULL, 0);
udp_sendto(model[h].socket, (char*)(&pkt), 4, &model[h].host);
tftp_reset_handle(h);
free(buffer[h].data);
sem_destroy(buffer_sem[h]);
sem_destroy(model_sem[h]);
} else {
sem_wait(model_sem[h]);
model[h].status = TFTP_FLUSHING;
sem_post(model_sem[h]);
}

return(0);
}

int tftp_put(int h, BYTE *rawdata, WORD n) {
sem_wait(buffer_sem[h]);

/* Buffer overflow checking */
if (buffer[h].nbytes + n > buffer[h].size) { /* Maybe ">"??? */
sem_post(buffer_sem[h]);
return(1);
}

/* Check this carefully!!! */
memcpy(buffer[h].data + buffer[h].nbytes, rawdata, n);
buffer[h].nbytes += n;

sem_post(buffer_sem[h]);

return(0);
}

int tftp_get(int h, BYTE *rawdata, WORD n) {
// cprintf("get mutex %d - use %d\n", buffer_sem[h]->mutexlevel, buffer_sem[h]->use);
sem_wait(buffer_sem[h]);

if (buffer[h].nbytes < 1) return(0);
if (buffer[h].nbytes < n) n = buffer[h].nbytes;

/* Check this carefully!!! */
memcpy(rawdata, buffer[h].data, n); /* Export data to calling function */
memcpy(buffer[h].data, buffer[h].data + n, n); /* Shift data into buffer */
buffer[h].nbytes -= n;

sem_post(buffer_sem[h]);
return(n);
}

int tftp_getbuffersize(int h) {
return(buffer[h].size); /* We on't use the mutex 'cause the size is read-only */
}

int tftp_usedbuffer(int h) {
int n;

// cprintf("used mutex %d - use %d\n", buffer_sem[h]->mutexlevel, buffer_sem[h]->use);
sem_wait(buffer_sem[h]);
n = buffer[h].nbytes;
sem_post(buffer_sem[h]);
return(n);
}

int tftp_freebuffer(int h) {
int n;

sem_wait(buffer_sem[h]);
n = buffer[h].size - buffer[h].nbytes;
sem_post(buffer_sem[h]);
return(n);
}

int tftp_status(int h) {
int n;

sem_wait(model_sem[h]);
n = model[h].status;
sem_post(model_sem[h]);
return(n);
}

///////////////////////////////////////////////////////////////////////////

int debug_setbuffer(int h, int size) {
if ((buffer[h].data = malloc(size)) == NULL) return(-1); /* Buffer allocation error */
buffer[h].size = size;
buffer[h].nbytes = 0;
return(0);
}

void debug_freebuffer(int h) {
free(buffer[h].data); /* Buffer allocation error */
buffer[h].size = 0;
buffer[h].nbytes = 0;
}

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(root)/shark/branches/xen/ports/tftp/tftp.c @ 1628 - Rev 1618