fix: timeout changed to 2s + invalid free fix when the socket creation fails

Makefile

@@ -16,7 +16,7 @@ obj/%.o: src/%.c
 	$(CC) $(CFLAGS) -c $< -o $@
 
 $(NAME): $(OBJ)
-	$(LD) $(LDFLAGS) -o $(NAME) $(OBJ) 
+	$(LD) -o $(NAME) $(OBJ) $(LDFLAGS) 
 
 clean:
 	rm -rf obj

include/response.h

@@ -7,7 +7,7 @@
 
 #include "scan.h"
 
-#define TIMEOUT 5
+#define TIMEOUT 2
 
 typedef enum {
 	CLOSED,

src/packet.c

@@ -74,14 +74,10 @@ static void *create_packet(const struct scan *data, size_t packet_size)
 
 	iphdr->check = checksum(packet, packet_size);
 
-	// this is starnakin stuff
-	switch ((int)isudp) {
-	case true:
+	if (isudp)
 		create_udp_packet(packet + sizeof(struct iphdr), data);
-		break;
-	default:
+	else
 		create_tcp_packet(packet + sizeof(struct iphdr), data);
-	}
 
 	return packet;
 }
@@ -98,12 +94,6 @@ int send_packet(const struct scan *data, int sockfd)
 	                                             : sizeof(struct tcphdr));
 	void *packet = create_packet(data, packet_size);
 
-	int one = 1;
-	const int *val = &one;
-	if (setsockopt(sockfd, IPPROTO_IP, IP_HDRINCL, val, sizeof(one)) < 0) {
-		perror("Error setting IP_HDRINCL");
-		return -1;
-	}
 
 	sendto(sockfd, packet, packet_size, 0, (struct sockaddr *)&conn_addr,
 	       sizeof(struct sockaddr_in));

src/scan.c

@@ -64,6 +64,13 @@ int scan(struct scan *data)
 		return -1;
 	}
 
+	int one = 1;
+	const int *val = &one;
+	if (setsockopt(sockfd, IPPROTO_IP, IP_HDRINCL, val, sizeof(one)) < 0) {
+		perror("Error setting IP_HDRINCL");
+		return -1;
+	}
+
 	char errbuf[PCAP_ERRBUF_SIZE];
 	bpf_u_int32 net, mask;
 

src/thread.c

@@ -25,11 +25,9 @@ void *routine(void *p_data)
 		scan_data.port_end = port;
 		scan_data.responses =
 		    &thread_data->responses[port - thread_data->port_start];
-		if (scan(&scan_data)) {
-			free(p_data);
+		if (scan(&scan_data))
 			return NULL;
 	}
-	}
 
 	return NULL;
 }