void CommandParser::do_cd(){
int len;
if (!is_loaded){
vd_puts("FILE SYSTEM NOT LOADED\n");
return ;
}
if(flpchange){
uloadfs();
}
if ( strlen(first_arg) == 0){
vd_puts("Current Dir:");
vd_puts(curr_dir);
return;
}
toAbsolute(first_arg);
if ( ispresent(first_arg) == -1 ){
vd_puts( "THE DIRECTORY SEEMS TO BE ON A HOLIDAY !!\n" );
errormessage(geterror());
return;
}
if ( !is_dir(first_arg) ){
vd_puts( "The Specified File is not a directory\n" );
return;
}
strcpy(curr_dir,first_arg);
}
void unify_var(char var[],char x[])
{char val[100],a[100];
i=0;
sprintf(a,"%s/",var);
while(i<strlen(theta))
{
strcpy(val,search_val(a,i));
if(strlen(val)>0)
unify(val,x);
i=i+strlen(a)-1;
}
i=0;
sprintf(a,"%s/",x);
while(i<strlen(theta))
{
strcpy(val,search_val(a,i));
if(strlen(val)>0)
unify(var,val);
i=i+strlen(a)-1;
}
sprintf(val,"%s/%s;",var,x);
if(ispresent(val))
return;
sprintf(theta+strlen(theta)-1," %s",val);
}
int main(int argc, char *argv[])
{
int sockfd, sockfd2;
struct addrinfo hints, *servinfo, *servinfo2, *p, *p2;
int rv, numbytes, numfiles = 0, i, choice, fd;
char s[INET6_ADDRSTRLEN], filename[80], buf[80], *token, *temp, *tofree, *list[10], path[100];
// register signal handler
signal(SIGINT, sighandler);
// give server IPV4 address as commandline argument
if (argc != 2) {
fprintf(stderr,"usage: ./client hostname\n");
exit(1);
}
// get a datagram socket, initialize addrinfo structure
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = 0;
// get addrinfo structure list
if ((rv = getaddrinfo(argv[1], SERVERPORT, &hints, &servinfo)) != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
return 1;
}
// loop through all the results and make a socket
for(p = servinfo; p != NULL; p = p->ai_next) {
if ((sockfd = socket(p->ai_family, p->ai_socktype,
p->ai_protocol)) == -1) {
perror("client: socket");
continue;
}
break;
}
if (p == NULL) {
fprintf(stderr, "talker: failed to bind socket\n");
return 2;
}
// assign socket and addrinfo list so that they can be freed later
Socket = sockfd;
garbage = servinfo;
// client enters a loop
while(1) {
// Enter filename to download
printf("Enter filename : ");
scanf("%s", filename);
// check if file is present already in shared folder
// if yes reiterate
if(ispresent(filename)) {
printf("File already available in shared folder\n");
continue;
}
// send file IP request to FIS
if ((numbytes = sendto(sockfd, filename, strlen(filename), 0,
p->ai_addr, p->ai_addrlen)) == -1) {
perror("client: sendto");
exit(1);
}
printf("client: sent file %s request (%d bytes) to %s\n", filename, numbytes, argv[1]);
// get file IP information from server
if ((numbytes = recvfrom(sockfd, buf, 80, 0,
p->ai_addr, &(p->ai_addrlen))) == -1) {
perror("recvfrom");
exit(1);
}
buf[numbytes] = '\0';
// if file not available with any user reiterate
if(!strcmp(buf, "none")){
printf("No user to download from...\n");
continue;
}
// divide the IP list obtained into IPs
temp = (char*)malloc(80);
strcpy(temp, buf);
tofree = temp;
numfiles = 0;
while ((token = strsep(&temp,",")) != NULL) {
list[numfiles++] = token;
}
for (i = 0; i < numfiles; ++i){
printf("%2d : %s\n", i+1, list[i]);
}
free(tofree);
// ask user to enter a user IP
printf("Choose a user...(Enter a serial number) : ");
scanf("%d", &choice);
// go on asking the user till a valid address is not available
while(choice < 0 || choice > numfiles){
printf("Enter a valid choice... : ");
scanf("%d", &choice);
}
// obtain a STREAM Socket for downloading the file
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
// get the struct addrinfo list
printf("%s\n",list[choice-1]);
if ((rv = getaddrinfo(list[choice-1], PORT, &hints, &servinfo2)) != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
return 1;
}
// loop through all the results and connect to the first we can
for(p2 = servinfo2; p2 != NULL; p2 = p2->ai_next) {
if ((sockfd2 = socket(p2->ai_family, p2->ai_socktype,
p2->ai_protocol)) == -1) {
perror("client: socket");
continue;
}
if (connect(sockfd2, p2->ai_addr, p2->ai_addrlen) == -1) {
close(sockfd2);
perror("client: connect");
continue;
}
break;
}
if (p2 == NULL) {
fprintf(stderr, "client: failed to connect\n");
return 2;
}
inet_ntop(p2->ai_family, get_in_addr((struct sockaddr *)p2->ai_addr),
s, sizeof s);
printf("client: connecting to %s\n", s);
freeaddrinfo(servinfo2); // all done with this structure
// send the filename to the client
if(send(sockfd2, filename, sizeof(filename), 0) == -1) {
perror("client : send");
exit(1);
}
// open a file to write the received data
strcpy(path, "downloaded/");
strcat(path, filename);
fd = open(path, O_WRONLY | O_CREAT | O_TRUNC);
// reveive bytes from server as long as the connection is open
while ((numbytes = recv(sockfd2, buf, 80, 0)) != 0) {
write(fd, buf, numbytes);
}
// close the file descriptor and socket
close(fd);
close(sockfd2);
printf("File downloaded successfully...\n");
}
freeaddrinfo(servinfo);
close(sockfd);
//return 0;
}
