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Helpers.c
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Helpers.c
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//
// Created by Mudassir Noor on 2020-02-17.
//
#include "Helpers.h"
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <pthread.h>
#include <errno.h>
#define BUFFERSIZE 200
int termination = 0;
int bindSocket(int socket, struct addrinfo* address){
return bind(socket, address->ai_addr, address->ai_addrlen);
}
int createSocket(struct addrinfo* address) {
return socket(address->ai_family, address->ai_socktype, address->ai_protocol);
}
struct addrinfo* getBoundedAddress(int* sockfd, struct addrinfo* addressResults) {
struct addrinfo* actualResult;
for (actualResult = addressResults; actualResult != NULL; actualResult = actualResult->ai_next) {
*sockfd = createSocket(actualResult);
if (*sockfd < 0) {
continue;
}
if (bindSocket(*sockfd, actualResult) < 0) {
close(*sockfd);
continue;
}
break;
}
if (actualResult == NULL) {
fprintf(stderr, "Failed to bind local socket\n");
exit(-1);
}
return actualResult;
}
struct addrinfo* getAddrInfoResults(char* hostname, char* portNumber, int ai_flag) {
int state;
struct addrinfo hint, *results;
memset(&hint, 0, sizeof(hint));
hint.ai_family = AF_UNSPEC;
hint.ai_socktype = SOCK_DGRAM;
hint.ai_protocol = IPPROTO_UDP;
if (ai_flag == AI_PASSIVE) {
hint.ai_flags = AI_PASSIVE;
}
if ((state = getaddrinfo(hostname, portNumber, &hint, &results)) < 0) {
fprintf(stderr, "Could not get address information: %s\n", gai_strerror(state));
exit(-1);
}
return results;
}
void validateInputParameters(int argc) {
if (argc <= 0) {
perror("Please pass in the parameters: [port number] [remote machine name] [remote port number");
exit(-1);
} else if (argc < 4) {
perror("Insufficient parameters");
exit(-1);
}
}
void readMessage(void* argument) {
SocketMetaData* senderSocket = (SocketMetaData*) argument;
do {
void *message = malloc(BUFFERSIZE);
read(0, message, BUFFERSIZE);
if (strcmp(message, "!\n") == 0)
termination = 1;
pthread_mutex_lock(&senderSocket->mutex);
ListAppend(senderSocket->messages, message);
pthread_cond_signal(&senderSocket->condition);
pthread_mutex_unlock(&senderSocket->mutex);
} while (termination == 0);
pthread_exit(NULL);
}
void sendMessage(void* argument[]) {
SocketMetaData* senderSocket = (SocketMetaData*) argument[0];
struct addrinfo* remoteAddress = (struct addrinfo *) argument[1];
do {
pthread_mutex_lock(&senderSocket->mutex);
pthread_cond_wait(&senderSocket->condition, &senderSocket->mutex);
while (ListFirst(senderSocket->messages) != NULL) {
void* text = RemoveMessage(senderSocket);
sendToAddress(senderSocket->sockfd, text, remoteAddress);
freeItem(text);
}
pthread_mutex_unlock(&senderSocket->mutex);
} while(termination == 0);
pthread_cancel(receiveThread);
pthread_cancel(printThread);
pthread_exit(NULL);
}
void receiveMessage(void* argument[]) {
int received;
SocketMetaData* receivingSocket = (SocketMetaData*) argument[0];
struct addrinfo* remoteAddress = (struct addrinfo*) argument[1];
do {
void* message = malloc(BUFFERSIZE);
received = recvfrom(receivingSocket->sockfd, message, BUFFERSIZE, 0, remoteAddress->ai_addr, &remoteAddress->ai_addrlen);
if (received < 0){
fprintf(stderr, "Receive failed: %s\n", strerror(errno));
}
else {
if (strcmp(message, "!\n") == 0)
termination = 1;
pthread_mutex_lock(&receivingSocket->mutex);
AddMessage(receivingSocket, message);
pthread_cond_signal(&receivingSocket->condition);
pthread_mutex_unlock(&receivingSocket->mutex);
}
} while (termination == 0);
pthread_exit(NULL);
}
void printMessage(void* argument) {
SocketMetaData* receivingSocket = (SocketMetaData*) argument;
do {
pthread_mutex_lock(&receivingSocket->mutex);
pthread_cond_wait(&receivingSocket->condition, &receivingSocket->mutex);
while (ListFirst(receivingSocket->messages) != NULL) {
void* text = RemoveMessage(receivingSocket);
printMessageToScreen(text);
freeItem(text);
}
pthread_mutex_unlock(&receivingSocket->mutex);
} while (termination == 0);
pthread_cancel(readThread);
pthread_cancel(sendThread);
pthread_exit(NULL);
}
void printMessageToScreen(void* message) {
char fullMessage[BUFFERSIZE];
strcpy(fullMessage, "Other: ");
strcat(fullMessage, message);
unsigned long int size = strlen(fullMessage);
write(0, fullMessage, size);
}
void sendToAddress(int sockfd, void* message, struct addrinfo* address) {
unsigned long int size = strlen(message);
int sent = sendto(sockfd, message, size, 0, address->ai_addr, address->ai_addrlen);
if (sent < 0){
fprintf(stderr, "Send Failed: %s", strerror(errno));
}
}
void freeItem(void* item) {
free(item);
}