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client.c
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client.c
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#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <signal.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <pthread.h>
#define LENGTH 1024
int NetworkSocket;
struct sockaddr_in ServerAddress, ServerAddressp;
int ConnectionStatus;
char Name[25];
volatile sig_atomic_t disconnectClient = 0;
int fd;
void printMyFiles(char *directorName) {
DIR *director;
if((director = opendir(directorName)) == NULL) {
printf("Eroare la opendir, nu s-a putut deschide directorul\n");
exit(500);
}
struct dirent *intrareDirector;
while((intrareDirector = readdir(director)) != NULL) {
char numeIntrare[30];
strcpy(numeIntrare, intrareDirector -> d_name);
if(strcmp(numeIntrare, "..") != 0 && strcmp(numeIntrare, ".") != 0) {
char fullPath[50];
snprintf(fullPath, sizeof(fullPath), "%s/%s", directorName, numeIntrare);
struct stat buf;
if(lstat(fullPath, &buf) < 0) {
printf("Eroare la lstat (fullPath)\n");
exit(501);
}
if(S_ISREG(buf.st_mode)) {
printf("%s |", numeIntrare);
}
}
}
printf("\n");
}
void Autentificare() {
printf("Welcome young padawan!\n\n");
printf("We are trying to connect to the server.\n\n");
printf("But wait, who are u???\n");
printf("Enter name: ");
fgets(Name, 32, stdin); // replace in all files with scanf after fin. code(onyl 1 word commands allowed, else #unknown#)
if(Name[strlen(Name) - 1] == '\n')
Name[strlen(Name) - 1] = '\0';
}
void rmNewLine (char* arr, int length) {
int i;
for (i = 0; i < length; i++) { // trim \n
if (arr[i] == '\n') {
arr[i] = '\0';
break;
}
}
}
void stopClient(int sig) {
disconnectClient = 1;
}
void flushStdout() {
printf("%s", "> ");
fflush(stdout);
}
void sendMessageHandler() {
char message[LENGTH] = {};
char buffer[LENGTH + 32] = {};
int fileFlag = 0;
printf("Type 'help' for help\n");
while(1) {
fileFlag = 0;
flushStdout();
fgets(message, LENGTH, stdin);
if(message[strlen(message) - 1] == '\n')
message[strlen(message) - 1] = '\0';
if (strcmp(message, "stop") == 0)
break;
if(strcmp(message, "help") == 0)
printf("Valid commands: stop, add file.extension, seeFiles, seeMyFiles\n");
if(message[0] == 'a' && message[1] == 'd' && message[2] == 'd') {
char file[30];
int fileIndex = 0;
for(int k = 4; k < strlen(message); k++)
file[fileIndex++] = message[k];
char clientDirFile[100];
snprintf(clientDirFile, 100, "server/%s/%s", Name, file);
int e1, e2;
// verify if the file already exists OR if it exists at all
if((e1 = access(file, F_OK)) != 0)
printf("Error: File %s doesn't exist or its path is invalid.\n", file);
else
if((e2 = access(clientDirFile, F_OK)) == 0)
printf("Error: File %s already exists in your dir = server/%s.\n", file, Name);
if(e1 == 1 || e2 == 0)
fileFlag = 1;
}
if(strcmp(message, "seeFiles") == 0) {
printf("Showing all avaiable files...\n");
}
if(strcmp(message, "seeMyFiles") == 0) {
printf("Showing your files...\n");
char myDir[33];
snprintf(myDir, sizeof(myDir), "server/%s", Name);
printMyFiles(myDir);
}
if(strcmp(message, "download") == 0) {
char f[30];
send(NetworkSocket, message, strlen(message), 0);
bzero(message, LENGTH);
printf("file=");
fgets(message, LENGTH, stdin);
fileFlag=1;
if(message[strlen(message) - 1] == '\n')
message[strlen(message) - 1] = '\0';
strcpy(f, message);
send(NetworkSocket, message, strlen(message), 0);
char *prs = malloc(sizeof(char) * LENGTH);
snprintf(prs, LENGTH-1, "server/%s/%s", Name, f);
if((fd = open(prs,O_CREAT | O_EXCL | O_WRONLY, S_IRWXU)) < 0) {
printf("Fisier existent\n");
close(fd);
}
free(prs);
}
if(!fileFlag)
send(NetworkSocket, message, strlen(message), 0);
bzero(message, LENGTH);
bzero(buffer, LENGTH + 32);
}
stopClient(2);
}
/*
connection
file.name
port
size
order
number
exemple
connection
cat.mp4
2425
1255
3
5
=> dimensiune 1255 , 5 persoane care trimit
1255/5 = 251
primul -> 0 -> 251
al 2-lea -> 251 -> 502
al 3-lea -> 502 -> 753
al 4-lea -> 753 -> 1004
al 5-lea -> 1004-> 1255
Ordinul 3 => eu o sa trimit prin portul 2425 din fisierul cat.mp4 de la 502 pana la 753.
*/
void receiveMessageHandler() {
char message[LENGTH] = {};
while (1) {
int receive = recv(NetworkSocket, message, LENGTH, 0);
if (receive > 0) {
printf("%s\n", message);
if(strcmp(message, "peer") == 0) {
printf("Primesc date!\n");
char prs[LENGTH] = {};
int portnumber;
char *buff = malloc(sizeof(char) * 5000);
if(recv(NetworkSocket, prs, LENGTH, 0) < 0) {
printf("eroare la trimitere spre network\n");
exit(51);
}
printf("%s\n", prs);
portnumber = atoi(prs);
memset(prs, 0x00, LENGTH);
int opt = 1;
int PeerConection = socket(AF_INET, SOCK_STREAM, 0);
struct sockaddr_in PeerAddress;
if(setsockopt(PeerConection, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
printf("setsockopt");
exit(45);
}
PeerAddress.sin_family = AF_INET;
PeerAddress.sin_port = htons(portnumber);
PeerAddress.sin_addr.s_addr = inet_addr("127.0.0.1");
if(bind(PeerConection, (struct sockaddr *) &PeerAddress, sizeof(PeerAddress)) < 0) {
printf("Eroare la socket binding\n");
exit(282);
}
if(listen(PeerConection, 3) < 0) {
printf("Eroare la socket listening\n");
exit(283);
}
int newsocket;
if((newsocket = accept(PeerConection, NULL, NULL)) == -1) {
printf("Eroare la acceptare!\n");
exit(43);
}
int n;
while((n = recv(newsocket, buff, sizeof(buff), 0)) > 0) {
printf("%s -buff nr = %d\n", buff, n);
if(write(fd, buff, n) < 0) {
printf("Eroare la scriere");
exit(34);
}
memset(buff, 0x00, LENGTH);
}
printf("buffer gol\n");
}
if(strcmp(message, "connection") == 0) {
char Datatypefiles[50];
char denumire[30];
int port;
int size;
int order;
int number;
recv(NetworkSocket, &Datatypefiles, sizeof(Datatypefiles), 0);
printf("Am primit un request\n%s\n", Datatypefiles);
char *p = strtok(Datatypefiles, "\n");
strcpy(denumire,p);
p = strtok(NULL, "\n");
port = atoi(p);
p = strtok(NULL, "\n");
size = atoi(p);
p = strtok(NULL, "\n");
order = atoi(p);
p = strtok(NULL, "\n");
number = atoi(p);
int dim = size / number + 1;
int fd2;
char *path = malloc(sizeof(char) * 200);
struct stat info;
snprintf(path, 199, "server/%s/%s", Name, denumire);
printf("%s\n", path);
if((fd2 = open(path,O_RDONLY |S_IRUSR)) < 0) {
printf("Eroare la deschidere fisier\n");
exit(4);
}
printf("Inainte de fstat\n");
if(fstat(fd2, &info) < 0) {
printf("Eroare la fc stat\n");
exit(69);
}
lseek(fd2, (info.st_size / number * order), SEEK_CUR);
char *buff = malloc(sizeof(char) * (dim + 1));
int n;
printf("Inainte de read\n");
if((n = read(fd2, buff, dim)) < 0) {
printf("Eroare la citirea din fisier\n");
exit(420);
}
else {
int PeerSocket;
PeerSocket = socket(AF_INET, SOCK_STREAM, 0);
ServerAddressp.sin_family = AF_INET;
ServerAddressp.sin_port = htons(port);
ServerAddressp.sin_addr.s_addr = inet_addr("127.0.0.1");
printf("Inainte de Connection\n");
ConnectionStatus = connect(PeerSocket, (struct sockaddr *) &ServerAddressp, sizeof(ServerAddressp));
if(ConnectionStatus == -1) {
printf("Connection failed!\n");
exit(1);
}
printf("%s\n\n", buff);
printf("Inainte de send\n");
send(PeerSocket, buff, strlen(buff), 0);
close(fd2);
free(buff);
close(PeerSocket);
}
}
flushStdout();
}
else
if (receive == 0) {
close(fd);
break;
}
else {
// -1
}
memset(message, 0, sizeof(message));
}
}
void createAndHoldConnection() {
char ServerResponse[11];
NetworkSocket = socket(AF_INET, SOCK_STREAM, 0);
ServerAddress.sin_family = AF_INET;
ServerAddress.sin_port = htons(2424);
ServerAddress.sin_addr.s_addr = inet_addr("127.0.0.1");
ConnectionStatus = connect(NetworkSocket, (struct sockaddr *) &ServerAddress, sizeof(ServerAddress));
if(ConnectionStatus == -1) {
printf("Connection failed!\n");
exit(1);
}
send(NetworkSocket, Name, sizeof(Name), 0);
recv(NetworkSocket, &ServerResponse, sizeof(ServerResponse), 0);
printf("%s \n", ServerResponse);
pthread_t send_msg_thread;
if(pthread_create(&send_msg_thread, NULL, (void *) sendMessageHandler, NULL) != 0) {
printf("ERROR: pthread\n");
exit(300);
}
pthread_t recv_msg_thread;
if(pthread_create(&recv_msg_thread, NULL, (void *) receiveMessageHandler, NULL) != 0) {
printf("ERROR: pthread\n");
exit(301);
}
while(1) {
if(disconnectClient) {
printf("You have disconnected!\n");
break;
}
}
close(NetworkSocket);
}
int main() {
Autentificare();
createAndHoldConnection();
return 0;
}