int main(int argc,char* argv[])
{
int s1,port,i,n,r,Sb,Sn,Rn,flag=0,w=5,EarliestMiss=-1;
char buff[256];
if(argc<2)
{
printf("Port? : ");
scanf("%d",&port);
gets(buff);
}
else
port=atoi(argv[1]);
s1=connectto("127.0.0.1",port);
printf("Enter the total number of packets to be sent : ");
scanf("%d",&n);
printf("Enter the percentage packet lose rate : ");
scanf("%d",&r);
printf("Selective repeat with window size %d\n",w);
Sb=0;
Sn=w-1;
while(1)
{
for(i=Sb; i<=Sn; i++)
{
if(i<n)
sendpacket(s1,i,r);
if(waittoread(s1)==1)
{
bzero(&buff,256);
read(s1,buff,255);
printf("Request for packet %s received \n",buff);
Rn=atoi(buff);
if(Rn>EarliestMiss)
EarliestMiss=Rn;
}
}
while(EarliestMiss>=Sb && EarliestMiss<=sn)
{
sendpacket(s1,EarliestMiss,r);
if(waittoread(s1)==1)
{
bzero(&buff,256);
read(s1,buff,255);
printf("Request for packet %s received\n",buff);
Rn=atoi(buff);
EarliestMiss=Rn;
}
}
Sn=Sn+w;
Sb=Sb+w;
if(Sb>=n)
break;
printf("Moving window forward\n");
}
close(s1);
printf("Client closed \n");
}
ssize_t atm_recv(ATM *atm, char *data, size_t max_data_len)
{
// Returns the number of bytes received; negative on error
if (waittoread(atm->sockfd, 2))
return recvfrom(atm->sockfd, data, max_data_len, 0, NULL, NULL);
else
return -1;
}
// main socket server
static void *server(void *asock){
putlog("server(): getpid: %d, pthread_self: %lu, tid: %lu",getpid(), pthread_self(), syscall(SYS_gettid));
int sock = *((int*)asock);
if(listen(sock, BACKLOG) == -1){
putlog("listen() failed");
WARN("listen");
return NULL;
}
while(1){
socklen_t size = sizeof(struct sockaddr_in);
struct sockaddr_in their_addr;
int newsock;
if(!waittoread(sock)) continue;
newsock = accept(sock, (struct sockaddr*)&their_addr, &size);
if(newsock <= 0){
putlog("accept() failed");
WARN("accept()");
continue;
}
struct sockaddr_in* pV4Addr = (struct sockaddr_in*)&their_addr;
struct in_addr ipAddr = pV4Addr->sin_addr;
char str[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &ipAddr, str, INET_ADDRSTRLEN);
putlog("Got connection from %s", str);
DBG("Got connection from %s\n", str);
pthread_t handler_thread;
if(pthread_create(&handler_thread, NULL, handle_socket, (void*) &newsock)){
putlog("server(): pthread_create() failed");
WARN("pthread_create()");
}else{
DBG("Thread created, detouch");
pthread_detach(handler_thread); // don't care about thread state
}
}
putlog("server(): UNREACHABLE CODE REACHED!");
}
static void *handle_socket(void *asock){
FNAME();
int sock = *((int*)asock);
int webquery = 0; // whether query is web or regular
char buff[BUFLEN];
ssize_t rd;
double t0 = dtime();
while(dtime() - t0 < SOCKET_TIMEOUT){
if(!waittoread(sock)){ // no data incoming
continue;
}
if(!(rd = read(sock, buff, BUFLEN-1))){
break;
}
DBG("Got %zd bytes", rd);
if(rd < 0){ // error
DBG("Nothing to read from fd %d (ret: %zd)", sock, rd);
break;
}
// add trailing zero to be on the safe side
buff[rd] = 0;
// now we should check what do user want
char *got, *found = buff;
if((got = stringscan(buff, "GET")) || (got = stringscan(buff, "POST"))){ // web query
webquery = 1;
char *slash = strchr(got, '/');
if(slash) found = slash + 1;
// web query have format GET /some.resource
}
// here we can process user data
DBG("user send: %s\nfound=%s", buff, found);
if(GP->echo){
if(!send_data(sock, webquery, found)){
putlog("can't send data, some error occured");
}
}
pthread_mutex_lock(&mutex);
const char *proto = "Commands: open, close, status";
if(strstr(found, "open")){
DBG("User asks 2 open");
putlog("User asks to open");
cmd = CMD_OPEN;
send_data(sock, webquery, "OK\n");
}else if(strstr(found, "close")){
DBG("User asks 2 close");
putlog("User asks to close");
cmd = CMD_CLOSE;
send_data(sock, webquery, "OK\n");
}else if(strstr(found, "weather")){
send_data(sock, webquery, weather);
}else if(strstr(found, "status")){
DBG("User asks 4 status");
send_data(sock, webquery, status);
}else send_data(sock, webquery, proto);
pthread_mutex_unlock(&mutex);
break;
}
close(sock);
pthread_exit(NULL);
return NULL;
}
