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team8_client.c
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team8_client.c
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/*
* For ECEN 602
* Programming Assignment 1, Group: Zheng, Kan Liu, Bowei
*
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include "chatroom_utils.h"
// get a username from the user.
void get_username(char *username, char* user_input_name)
{
if(strlen(user_input_name) > 20)
{
// clear_stdin_buffer();
puts("Username must be 20 characters or less.");
exit(1);
} else {
memset(username, 0, 1000);
strcpy(username, user_input_name);
}
}
//send local username to the server.
void send_join(connection_info *connection)
{
SBCP_message msg = initSBCP(JOIN);
pushAttr( &msg, Username, connection->username);
if(send(connection->socket, (void*)&msg, sizeof(msg), 0) < 0)
{
perror("Send failed");
exit(1);
}
}
void stop_client(connection_info *connection)
{
close(connection->socket);
exit(0);
}
//initialize connection to the server.
void connect_to_server(connection_info *connection, char* user_input_name ,char *address, char *port)
{
while(true)
{
get_username(connection->username, user_input_name );
//Create socket
if ((connection->socket = socket(AF_INET, SOCK_STREAM , IPPROTO_TCP)) < 0)
{
perror("Could not create socket");
}
connection->address.sin_addr.s_addr = inet_addr(address);
connection->address.sin_family = AF_INET;
connection->address.sin_port = htons(atoi(port));
//Connect to remote server
if (connect(connection->socket, (struct sockaddr *)&connection->address , sizeof(connection->address)) < 0)
{
perror("Connect failed.");
exit(1);
}
send_join(connection);
// there is no ACK, so no need to check following part
/*
SBCP_message msg;
ssize_t recv_val = recv(connection->socket, &msg, sizeof(SBCP_message), 0);
if(recv_val < 0)
{
perror("recv failed");
exit(1);
}
else if(recv_val == 0)
{
close(connection->socket);
printf("also full", connection->username);
exit(1);
}
*/
break;
}
puts("Connected to server.");
puts("Type your messages.");
}
void handle_user_input(connection_info *connection)
{
char input[255];
fgets(input, 255, stdin);
trim_newline(input);
// message msg;
SBCP_message msg = initSBCP( SEND );
// msg.type = PUBLIC_MESSAGE;
pushAttr(&msg, Username, connection->username);
// strncpy(msg.username, connection->username, 20);
//clear_stdin_buffer();
if(strlen(input) == 0) {
return;
}
// strncpy(msg.data, input, 255);
pushAttr(&msg, Message, input );
//Send some data
if(send(connection->socket, &msg, sizeof(msg), 0) < 0)
{
perror("Send failed");
exit(1);
}
}
void handle_server_message(connection_info *connection)
{
SBCP_message msg;
// message msg;
//Receive a reply from the server
ssize_t recv_val = recv(connection->socket, &msg, sizeof(msg), 0);
if(recv_val < 0)
{
perror("recv failed");
exit(1);
}
else if(recv_val == 0)
{
close(connection->socket);
puts("Server disconnected.");
exit(0);
}
header_type h_type = getHeaderType( msg);
switch(h_type)
{
case FWD:;
char username[20];
char msg_content[256];
getUsername(msg, username);
getMessageContent(msg, msg_content);
printf("%s: %s\n", username, msg_content);
break;
case NAK:;
char corresponding_text[512];
getCorrespondingAttr(msg, corresponding_text, Reason ); //
printf("%s\n",corresponding_text);
close(connection->socket);
exit(0);
break;
default:
fprintf(stderr, "Unknown message type received.\n");
break;
}
}
int main(int argc, char *argv[])
{
connection_info connection;
fd_set file_descriptors;
if (argc != 4) {
fprintf(stderr,"Usage: %s <username> <IP> <port>\n", argv[0]);
exit(1);
}
connect_to_server(&connection, argv[1], argv[2], argv[3]);
//keep communicating with server
while(true)
{
FD_ZERO(&file_descriptors);
FD_SET(STDIN_FILENO, &file_descriptors);
FD_SET(connection.socket, &file_descriptors);
fflush(stdin);
if(select(connection.socket+1, &file_descriptors, NULL, NULL, NULL) < 0)
{
perror("Select failed.");
exit(1);
}
if(FD_ISSET(STDIN_FILENO, &file_descriptors))
{
handle_user_input(&connection);
}
if(FD_ISSET(connection.socket, &file_descriptors))
{
handle_server_message(&connection);
}
}
close(connection.socket);
return 0;
}