#include #include #include #include #include #include #include #include #include #include #include #include // Regular Colors #define RED "\33[0;31m" #define GREEN "\33[0;32m" #define YELLOW "\33[0;33m" #define BLUE "\33[0;34m" #define PURPLE "\33[0;35m" #define CYAN "\33[0;36m" #define WHITE "\33[0;37m" // Reset to default color #define RESET "\33[0m" // Bold #define BRED "\33[1;31m" #define BGREEN "\33[1;32m" #define BYELLOW "\33[1;33m" #define BBLUE "\33[1;34m" #define BPURPLE "\33[1;35m" #define BCYAN "\33[1;36m" #define BWHITE "\33[1;37m" int Break_Function = 0; // Exit function that was executed after the user type Ctrl+C void exit_function(int signal){ printf("[ ok ] \rStop functions that was running in the background .\n"); Break_Function = 1; exit(0); } // Exit function that was executed in Child void Child_Kill(int signal){ printf("\r%s[ %sok %s] Stop Child process with pid %s%d%s .%s\n",WHITE,GREEN,WHITE,GREEN, getpid(),WHITE,RESET); exit(0); } // Exit function that was executed in Parent void Parent_Kill(int signal){ sleep(2); printf("\r%s[ %sok %s] Stop Parent with pid %s%d%s .%s\n",WHITE,GREEN,WHITE,GREEN, getpid(),WHITE,RESET); Break_Function = 1; fclose(stdin); } void read_function_in_bg(int *client_socket){ int client_socket_thread=*(int *)client_socket,receive_status; char msg_rcv[256],end[10]="bye\n"; bzero(msg_rcv,256); while(strcmp(msg_rcv,end)!=0 && Break_Function==0){ receive_status=read(client_socket_thread,&msg_rcv,sizeof(msg_rcv)); if(receive_status<0){ printf("%s[%s!%s] %sError%s with receiving data .%s\n",WHITE,RED,WHITE,RED,WHITE,RESET); } else { printf("\r%sClient : %s",CYAN,WHITE); fputs(msg_rcv,stdout); printf("%s", RESET); } } kill(getppid(),SIGINT); exit(0); } void ascii_art(){ printf("\n"); usleep(200000); printf("%s ███████╗███████╗██████╗ ██╗ ██╗███████╗██████╗ %s\n",RED,RESET); usleep(200000); printf("%s ██╔════╝██╔════╝██╔══██╗██║ ██║██╔════╝██╔══██╗%s\n",RED,RESET); usleep(200000); printf("%s ███████╗█████╗ ██████╔╝██║ ██║█████╗ ██████╔╝%s\n",BRED,RESET); usleep(200000); printf("%s ╚════██║██╔══╝ ██╔══██╗╚██╗ ██╔╝██╔══╝ ██╔══██╗%s\n",BRED,RESET); usleep(200000); printf("%s ███████║███████╗██║ ██║ ╚████╔╝ ███████╗██║ ██║%s\n",RED,RESET); usleep(200000); printf("%s ╚══════╝╚══════╝╚═╝ ╚═╝ ╚═══╝ ╚══════╝╚═╝ ╚═╝%s\n",RED,RESET); usleep(200000); printf("\n"); } int main(int argc, char const *argv[]) { system("clear"); ascii_art(); // Redirect signals that was generated by the user signal(SIGINT,exit_function); // Declare variables char msg_sent[256]="You have reached the server successfully .",msg_end[10]="bye\n"; // Create a socket for our server int socket_id=socket(AF_INET,SOCK_STREAM,0); if(socket_id==-1){ printf("%s[%s!%s] There was an%s error%s to create the socket .%s\n",WHITE,RED,WHITE,RED,WHITE,RESET); exit(1); } // Specify server information struct sockaddr_in server_address; server_address.sin_family=AF_INET; server_address.sin_port=htons(atoi(argv[1])); // htons(host to network short) and atoi(ASCII to integer) server_address.sin_addr.s_addr=INADDR_ANY; // Bind an address to our socket if(bind(socket_id,(struct sockaddr*) &server_address,sizeof(server_address))==-1){ printf("%s[%s!%s] There was an%s error%s to attach an address .%s\n",WHITE,RED,WHITE,RED,WHITE,RESET); exit(1); } else { printf("%s[ %sok%s ] Binding %sdone%s ...%s\n",WHITE,GREEN,WHITE,GREEN,WHITE,RESET); } // Listen and verify the connection status printf("%s[ %s**%s ] Waiting for a %sconnection%s ...%s\n",WHITE,CYAN,WHITE,GREEN,WHITE,RESET); listen(socket_id,5); // Accept any client trying connect to the server int server_address_length=sizeof(server_address); int client_socket=accept(socket_id,(struct sockaddr*) &server_address,&server_address_length); if (client_socket==-1) { printf("%s[%s!%s] Error accepting %sconnection%s ...%s\n",WHITE,RED,WHITE,GREEN,WHITE,RESET); exit(1); } else { printf("%s[ %sok%s ] %sConnection%s accepted .%s\n",WHITE,GREEN,WHITE,YELLOW,WHITE,RESET); } // Send success message to the client that have reached our server write(client_socket,msg_sent,sizeof(msg_sent)); // Verify the password char CPON[8]="-1",password[256]="admin",client_response[256]=""; while(strcmp(password,client_response)!=0){ read(client_socket,&client_response,sizeof(client_response)); if(strcmp(password,client_response)!=0){ write(client_socket,CPON,sizeof(CPON)); } else { char CPON[8]="0"; write(client_socket,CPON,sizeof(CPON)); printf("%s[ %sok %s] Client connect to the server %ssuccessfully%s .%s\n",WHITE,GREEN,WHITE,GREEN,WHITE,RESET); } } // Create multiple process pid_t pid = fork(); if(pid==-1){ printf("%s[%s!%s] There was an %serror%s with %sfork%s .%s\n",WHITE,RED,WHITE,RED,WHITE,YELLOW,WHITE,RESET); } else if(pid==0) { signal(SIGINT,Child_Kill); read_function_in_bg(&client_socket); } else if(pid>0){ // Create a loop to send multiple messages signal(SIGINT,Parent_Kill); printf("%sYou %s: %s", CYAN,WHITE,YELLOW); while(fgets(msg_sent,256,stdin) != NULL && Break_Function==0){ printf("\033[1A\033[2K%sYou%s :%s %s%s",CYAN,WHITE,YELLOW,msg_sent,RESET); printf("%sYou %s: %s", CYAN,WHITE,YELLOW); if(strcmp(msg_sent,msg_end)!=0){ sendto(client_socket,msg_sent,sizeof(msg_sent),0,(struct sockaddr*) &server_address,sizeof(server_address)); } else { printf("%s[ %sok %s] %sSession%s with the server was %sended%s .%s\n",WHITE,GREEN,WHITE,YELLOW,WHITE,RED,WHITE,RESET); sendto(client_socket,msg_end,sizeof(msg_end),0,(struct sockaddr*) &server_address,sizeof(server_address)); kill(pid,SIGINT); break; } } sendto(client_socket,msg_end,sizeof(msg_end),0,(struct sockaddr*) &server_address,sizeof(server_address)); int status; pid_t child_pid = wait(&status); if(child_pid==-1){ printf("%s[%s!%s] There was an%s error%s to terminate child process .%s\n",WHITE,RED,WHITE,RED,WHITE,RESET); } else if(child_pid>0){ printf("%s[ %sok %s] The child with %sPID%s %d%s & %sstatus%s of %s%d%s was %sstoped%s .%s\n",WHITE,GREEN,WHITE,GREEN,RED, child_pid,WHITE,GREEN,WHITE,RED,status,WHITE,RED,WHITE,RESET); } // Send end message to the client sendto(client_socket,msg_end,sizeof(msg_end),0,(struct sockaddr*) &server_address,sizeof(server_address)); // Close Sockets close(client_socket); close(socket_id); } // Coder : Silent Ghost X }

C Socket Programming /server.c