int main(int argc, char const *argv[])
{
FILE *fp;
int i = 0;
char line[MAX_LAST_NAME_SIZE];
clock_t start, end;
double cpuTimeUsed1, cpuTimeUsed2;
/* check file opening*/
fp = fopen("./dictionary/words.txt", "r");
if (fp == NULL){
printf("cannot open the file\n");
return 0;
}
/* create hash table. table size is a prime number*/
int tableSize = 42737;
hashTable *ht = createHashTable(tableSize);
printf("hash table size (prime number) : %d\n", tableSize);
/* build the lastNameEntry */
lastNameEntry *pHead, *lne;
pHead = (lastNameEntry *) malloc(sizeof(lastNameEntry));
printf("size of entry : %lu bytes\n", sizeof(lastNameEntry));
lne = pHead;
lne->pNext = NULL;
start = clock();
while (fgets(line, sizeof(line), fp)){
while(line[i] != '\0'){
i++;
}
line[i-1] = '\0';
i = 0;
appendHash(line, ht);
}
end = clock();
cpuTimeUsed1 = ((double) (end - start)) / CLOCKS_PER_SEC;
/* input lastName */
char input[INPUT_SIZE][MAX_LAST_NAME_SIZE] = {"uninvolved","zyxel","whiteshank",
"odontomous", "pungoteague", "reweighted", "xiphisternal", "yakattalo"};
/* compute the execution time */
int j;
lne = pHead;
start = clock();
for(j = 0; j < INPUT_SIZE; j++){
findNameHash(input[j], ht);
lne = pHead;
}
end = clock();
cpuTimeUsed2 = ((double) (end - start)) / CLOCKS_PER_SEC;
printf("execution time of appendHash() : %lf\n", cpuTimeUsed1);
printf("execution time of findNameHash() : %lf\n", cpuTimeUsed2);
/* release the resource */
free(pHead);
fclose(fp);
return 0;
}
/*****************child process encrypt udp connection*******************/
void udp_vpn(int MODE, int Port, char *ip, int port, int pipefd) {
struct sockaddr_in sin, sout;//standard in and out sockets address
struct ifreq ifr;//virtual nic card
socklen_t soutlen;
int fd, s, l, i, ready = 0;
int status;
fd_set fdset;
char buf[BUFSIZE], hash[HASHLEN], totalbuf[BUFSIZE];
//set up virtual nic card
if ((fd = open("/dev/net/tun", O_RDWR)) < 0) PERROR("open error!!!");
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TUN;
strncpy(ifr.ifr_name, "toto%d", IFNAMSIZ);
if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) PERROR("ioctl");
printf("Allocated interface %s. Configure and use it\n", ifr.ifr_name);
//create udp socket
s = socket(PF_INET, SOCK_DGRAM, 0);
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(INADDR_ANY);
sin.sin_port = htons(Port);
//bind step
if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) PERROR("bind error!!!");
soutlen = sizeof(sout);
if (MODE == CLIENT) {
sout.sin_family = AF_INET;
sout.sin_port = htons(port);
inet_aton(ip, &sout.sin_addr);
}
while (1) {
//read the key
l = read(pipefd, buf, sizeof(buf));
if (l > 0) {
if (buf[0] == 'a') { //disconnect
exit(0);
}
else if (buf[0]=='k') { //getting key
memcpy(key, buf + 1, KEYSIZE);
ready = 1;
}
}
if (!ready) {
sleep(1);
continue;
}
//fd from nic card, s from socket
FD_ZERO(&fdset);
FD_SET(fd, &fdset);
FD_SET(s, &fdset);
if (select(fd+s+1, &fdset,NULL,NULL,NULL) < 0) PERROR("select");//select which file descriptor is using
//virtual nic card
if (FD_ISSET(fd, &fdset)) {
if (DEBUG) printf("SENT: ");
l = read(fd, buf, BUFSIZE);
if (l < 0) PERROR("read");
if (DEBUG) {
printf("\nplain payload: ");
for(i = 0; i < l; i++) printf("%02x", *(buf+i));
printf("\n");
}
genIV(IV);
//encrypt, hash, append, and send to client
if (do_crypt(key, IV, buf, &l, 1)) {
if (DEBUG) {
printf("\nencrypted payload: ");
for(i = 0; i < l; i++) printf("%02x", *(buf+i));
printf("\n");
}
memcpy(totalbuf, IV, IVSIZE);
memcpy(totalbuf+IVSIZE, buf, BUFSIZE-IVSIZE);
l+=IVSIZE;
appendHash(totalbuf, &l);
if (DEBUG) {
printf("\nfinal payload: ");
for(i = 0; i < l; i++) printf("%02x", *(buf+i));
printf("\n");
}
//send to client
if (sendto(s, totalbuf, l, 0, (struct sockaddr *)&sout, soutlen) < 0) PERROR("sendto");
}
else {
printf("encrypt error\n");
}
}
//socket
else {
if (DEBUG) printf("\n RECEIVED");
l = recvfrom(s, buf, BUFSIZE, 0, (struct sockaddr *)&sout, &soutlen);
if (DEBUG) {
printf("\n(encrypted) payload: ");
for(i = 0; i < l; i++) printf("%02x", *(buf+i));
putchar(10);
}
//check reliability
if (checkHash(buf, &l)) {
printf("HASH mismatch.\n");
}
else {
memcpy(IV, buf, IVSIZE);
if (DEBUG) {
printf("\nhash checked payload: ");
for(i = 0; i < l; i++) printf("%02x", *(buf+i));
putchar(10);
}
l-=IVSIZE;
//decrypt and send to virtual nic card
if (do_crypt(key, IV, buf+IVSIZE, &l, 0)) {
if (DEBUG) {
printf("\nfinal plain payload: ");
for(i = 0; i < l; i++) printf("%02x", *(buf+i));
putchar(10);
}
if (write(fd, buf+IVSIZE, l) < 0) PERROR("write");
}
else {
printf("decrypt error\n");
}
}
}
}
}