int llopen(unsigned int port, unsigned int flag) {
if (init_link(port))
return -1;
linklayer.flag = flag;
int fd = open_port_file(port);
if (flag == RECEIVER) {
if (rec_set(fd))
return -1;
if (send_ua(fd, flag))
return -1;
} else if (flag == SENDER) {
if (send_set(fd))
return -1;
if (rec_ua(fd, flag))
return -1;
} else {
printf("ENTER A VALID STATUS!\n");
close_port_file(fd);
return -1;
}
initialized = -1;
return fd;
}
int receive_set(int fd, int count) {
int res;
char buf[255];
//RECEIVE SET
strcpy(buf,"");
while (STOP_REC == FALSE) {
res = read(fd,buf,1);
printf("%x\n", buf[res-1]);
switch(count) {
case 0:
if(buf[res-1] == FLAG)
count++;
break;
case 1:
if(buf[res-1] == A_SEND)
count++;
else if(buf[res-1] == FLAG)
break;
else count=0;
break;
case 2:
if(buf[res-1] == C_SET)
count++;
else if(buf[res-1] == FLAG)
count=1;
else count=0;
break;
case 3:
if(buf[res-1] == (A_SEND^C_SET))
count++;
else if (buf[res-1] == FLAG)
count = 1;
else count = 0;
break;
case 4:
if (buf[res-1] == FLAG) {
printf("Received SET!\n");
return send_ua(fd);
}
else count = 0;
break;
}
}
return -1;
}
int
advt_addr6(struct in6_addr* addr6, int prefix_len, char* prov_ifname)
{
/* First, we need to find a proper device to assign the address */
char* if_name = get_if(addr6, &prefix_len, prov_ifname);
int i;
if (NULL == if_name) {
cl_log(LOG_ERR, "no valid mechanisms");
return OCF_ERR_GENERIC;
}
/* Send unsolicited advertisement packet to neighbor */
for (i = 0; i < UA_REPEAT_COUNT; i++) {
send_ua(addr6, if_name);
sleep(1);
}
return OCF_SUCCESS;
}
int llclose(int fd, unsigned int flag) {
if (!initialized) {
printf("THIS IS ALREADY CLOSE\n");
return -1;
}
if (flag == SENDER) {
if (send_disc(fd, flag))
return -1;
if (rec_disc(fd, flag))
return -1;
if (send_ua(fd, flag))
return -1;
}
if (close_port_file(fd))
return -1;
return 0;
}
int
start_addr6(struct in6_addr* addr6, int prefix_len, char* prov_ifname)
{
int i;
char* if_name;
if(OCF_SUCCESS == status_addr6(addr6,prefix_len,prov_ifname)) {
return OCF_SUCCESS;
}
/* we need to find a proper device to assign the address */
if_name = find_if(addr6, &prefix_len, prov_ifname);
if (NULL == if_name) {
cl_log(LOG_ERR, "no valid mechanisms");
return OCF_ERR_GENERIC;
}
/* Assign the address */
if (0 != assign_addr6(addr6, prefix_len, if_name)) {
cl_log(LOG_ERR, "failed to assign the address to %s", if_name);
return OCF_ERR_GENERIC;
}
/* Check whether the address available */
for (i = 0; i < QUERY_COUNT; i++) {
if (0 == is_addr6_available(addr6)) {
break;
}
sleep(1);
}
if (i == QUERY_COUNT) {
cl_log(LOG_ERR, "failed to ping the address");
return OCF_ERR_GENERIC;
}
/* Send unsolicited advertisement packet to neighbor */
for (i = 0; i < UA_REPEAT_COUNT; i++) {
send_ua(addr6, if_name);
sleep(1);
}
return OCF_SUCCESS;
}
int llread(int control) {
int state = 0;
int equalize = 0;
int res = 0;
int count_buf = 0;
char buf[MAX_SIZE];
char ant[1];
//RECEIVE INF
strcpy(buf,"");
while(TRUE) {
res = read(appLayer.fd,buf,1);
switch(state) {
case 0:
if(buf[res-1] == FLAG)
state++;
count_buf = 0;
ll.sequenceNumber = 0;
break;
case 1:
if(buf[res-1] == A_SEND)
state++;
else if(buf[res-1] == FLAG)
break;
else
state=0;
strcpy(ll.frame,"");
count_buf = 0;
ll.sequenceNumber = 0;
ant[0] = '\0';
break;
case 2:
if(buf[res-1] == C_SET)
state++;
else if(buf[res-1] == C_SI && setNum == 1)
state = 5;
else if(buf[res-1] == C_SF && control == 1 && setNum == 1)
state=5;
else if (buf[res-1] == C_DISC)
state=8;
else if(buf[res-1] == FLAG)
state=1;
else
state=0;
break;
case 3:
if(buf[res-1] == (A_SEND^C_SET))
state++;
else if (buf[res-1] == FLAG)
state = 1;
else
state = 0;
break;
case 4:
if (buf[res-1] == FLAG) {
printf("Received SET!\n");
state = 0;
setNum = 1;
return send_ua();
}
else
state = 0;
break;
case 5:
if(buf[res-1] == (C_SI^A_SEND)) {
state = 6;
equalize = 0;
}
else if(buf[res-1] == (C_SF^A_SEND)) {
state = 6;
equalize = 1;
}
else if (buf[res-1] == FLAG)
state = 1;
else
state = 0;
ant[0] = buf[res-1];
break;
case 6:
if(buf[res-1] == FLAG)
state = 1;
else if(buf[res-1] == AFT_FLAG) {
if(ant[0] == ESC) {
ll.frame[count_buf] = FLAG;
count_buf++;
ant[0] = '\0';
}
else {
ll.frame[count_buf] = AFT_FLAG;
count_buf++;
ant[0] = AFT_FLAG;
}
}
else if(buf[res-1] == AFT_ESC){
if(ant[0] == ESC){
ll.frame[count_buf] = ESC;
count_buf++;
ant[0] = '\0';
}
else {
ll.frame[count_buf] = AFT_ESC;
count_buf++;
ant[0] = AFT_ESC;
}
}
else if(buf[res-1] == ESC) {
ant[0] = ESC;
break;
}
else if(buf[res-1] == (C_SI^A_SEND) || buf[res-1] == (C_SF^A_SEND)){
state = 7;
ant[0] = buf[res-1];
}
else {
ll.frame[count_buf] = buf[res-1];
count_buf++;
ant[0] = buf[res-1];
}
break;
case 7:
if(buf[res-1] == FLAG){
printf("Successfully destuffed bytes and saved message! %d bytes\n", count_buf);
ant[0]='\0';
state = 0;
ll.sequenceNumber = count_buf;
return equalize+1;
}
else{
ll.frame[count_buf] = ant[0];
count_buf++;
ll.frame[count_buf] = buf[res-1];
ant[0]=buf[res-1];
count_buf++;
state=6;
}
break;
case 8:
if(buf[res-1] == (A_SEND^C_DISC))
state=9;
else if (buf[res-1] == FLAG)
state = 1;
else
state = 0;
break;
case 9:
if(buf[res-1] == FLAG){
printf("Sending DISC and shutting down!\n");
return 3; //send_disc_nc();
}
else
state = 0;
break;
default:
printf("Error llread: state is not between 0 and 9!\n");
break;
}
}
return -1;
}
