main(int argc, char **argv)
{
int abs_blockno = 0;
int rel_blockno = 0;
int outfile;
outfile = creat("outfile", 0666);
if (outfile < 0) {
perror("sparse");
(void)exit(1);
}
while(read(0, buf, BLKLEN) == BLKLEN) {
if (!allzero(buf, BLKLEN)) {
write(outfile, buf, BLKLEN);
blockmap[rel_blockno++] = abs_blockno;
}
abs_blockno++;
}
write(outfile, blockmap, rel_blockno*sizeof(int));
write(outfile, &rel_blockno, sizeof(int));
write(outfile, &abs_blockno, sizeof(int));
write(outfile, &blen, sizeof(int));
close(outfile);
}
void rputdir(){
DIR *dp = opendir(command.arguments);
allzero(buffer, 1);
if(!dp){
fprintf(stdout, "The specified folder does not exist\n");
return;
}
closedir(dp);
// send command //
send_pack(RPUTDIR, command.arguments, sock);
/* send port number for data connection to server */
send_data_port();
// make socket and accept server's Data Connection (active)//
makeDataConnection();
fprintf(stderr, "rputdir() : data connection accepted\n");
// recieve file //
send_rputdir_files(command.arguments);
fprintf(stdout, "rputdir() : files completely sent\n");
fflush(stdout);
// close the data connection //
close(request->serverSocket);
//close(sock_data);
}
void mput(){
// Send command //
allzero(buffer, 1);
send_pack(MPUT, buffer, sock);
fprintf(stdout, "mput() : packet_str : %s\n", packet_str);
/* send port number for data connection to server */
send_data_port();
// make socket and accept server's Data Connection (active)//
makeDataConnection();
fprintf(stderr, "mput() : data connection accepted\n");
// send files //
sendMultipleFiles(command.arguments);
fprintf(stdout, "mput() : files completely sent\n");
fflush(stdout);
// close the data connection //
close(request->serverSocket);
/*
if(setsockopt(sock_data, SOL_SOCKET, SO_REUSEADDR, (void*)&optval, sizeof(int)) < 0){
error("setsockopt") ;
}
*/
}
void dir(){
// send command //
allzero(buffer, 1);
send_pack(DIRL, buffer, sock);
/* send port number for data connection to server */
send_data_port();
// make socket and accept server's Data Connection (active)//
makeDataConnection();
fprintf(stderr, "get() : data connection accepted\n");
// recieve file list //
receive_file_list();
fprintf(stdout, "get() : complete file received\n");
// close the data connection //
close(request->serverSocket);
}
void pwd(){
// send command
allzero(buffer, 1);
send_pack(PWD, buffer, sock);
// receive the server's response //
if(recv(sock, packet_str, PACK_SIZE, 0) < 0){
error("recv");
}
parse_packet(packet_str, packet);
// take appropriate action
if(packet.command_code == PWD){
fprintf(stdout, "%s\n", packet.buffer);
strcpy(server_curdir, packet.buffer);
}
else if(packet.command_code == INVALID){
fprintf(stderr, "Not able to retrieve current working directory\n");
}
}
int main(int argc, char *argv[])
{
/* Socket Variables */
int sock, n;
unsigned int length;
struct sockaddr_in server, from;
struct hostent *hp;
/* check if sufficient arguments are provided */
if(argc < 2){
printf("Usage: server name or address\n");
exit(1);
}
/* creating socket */
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0)
error("socket");
server.sin_family = AF_INET;
hp = gethostbyname(argv[1]);
if(!hp)
error("Unknown host");
bcopy((char *)hp->h_addr, (char *)&server.sin_addr, hp->h_length);
server.sin_port = htons(SERVER_PORT);
length = sizeof(struct sockaddr_in);
struct Packet packet;
while(1){
char filename[BUF_SIZE], packet_str[PACK_SIZE], buffer[BUF_SIZE];
bzero(filename, BUF_SIZE);
// check whether filename is provided as an argument, otherwise prompt for filename //
if(argc < 3){
printf("\nPlease enter the name of the file: ");
scanf("%s", filename);
}
else{
strcpy(filename, argv[2]);
}
bzero(buffer, BUF_SIZE);
bzero(packet_str, PACK_SIZE);
strcpy(buffer, filename);
// prepare packet to be sent //
strcpy(packet_str, "");
ptos(-1, REQUEST, 0, buffer, packet_str);
printf("Trying %s ... for File : %s\n", argv[1], filename);
// Send REQUEST //
n = sendto(sock,packet_str, strlen(packet_str),0,(const struct sockaddr *)&server,length);
if(n < 0)
error("Sendto");
// Receive REQUEST_ACK //
strcpy(packet_str, "");
n = recvfrom(sock,packet_str,PACK_SIZE,0,(struct sockaddr *)&from, &length);
if(n < 0)
error("recvfrom");
parse_packet(packet_str, packet);
// Try Again if the server was too busy //
if(packet.connection_id == -1){
printf("The server is too busy !!\n");
continue;
}
short conn_id = packet.connection_id;
printf("The server %s is querying the timestamp of the file %s ... \n", argv[1], filename);
// Receive DONE //
strcpy(packet_str, "");
char done_str[PACK_SIZE];
n = recvfrom(sock,done_str,PACK_SIZE,0,(struct sockaddr *)&from, &length);
if(n < 0)
error("recvfrom");
parse_packet(done_str, packet);
// report to the user in case the file does not exist //
if(packet.status == 1){
printf("The file %s DOES NOT EXIST !!\n", filename);
}
else{
printf("Timestamp of %s is %s\n", filename, packet.buffer);
// Send DONE_ACK //
strcpy(packet_str, "");
allzero(buffer, BUF_SIZE - 1);
ptos(conn_id, DONE_ACK, 0, buffer, packet_str);
n = sendto(sock,packet_str, strlen(packet_str),0,(const struct sockaddr *)&server,length);
if(n < 0)
error("Sendto");
}
// close program if filename was provided as an argument //
if(argc > 2)
break;
}
close(sock);
return 0;
}
