char *getNextSteppingStone()
{
FILE *ifp = fopen("chainlist.txt", "r");
if (ifp == NULL)
{
perror("Can't open file chainlist.txt");
exit(-1);
}
char c = NULL;
int num_ss;
c = fgetc(ifp);
num_ss = c - '0';
fclose(ifp);
if (num_ss == 1) return NULL;
num_ss--;
removeCurrentHost(num_ss);
return getRandomSS();
}
int
main (int argc, char **argv)
{
struct chainData cd;
char urlValue[255] = "";
char *argValue = NULL;
char *SSaddr;
int SSport;
char chainfileName[255] = "./chaingang.txt";
int c;
int i;
int chosenLinkNum;
int iMaxPortNumber = 65535;
opterr = 0;
srand(time(NULL));
while ((c = getopt (argc, argv, "c:")) != -1)
{
argValue = optarg;
switch (c)
{
case 'c':
strcpy(chainfileName,argValue);
break;
default:
fprintf (stderr, "Unknown command line option: -%c\n", optopt);
printUsage ();
exit (1);
}
}
for (i=optind; i < argc; i++)
strcpy(urlValue,argv[i]);
if (urlValue == "")
{
fprintf (stderr, "Command line argument '<URL>' is required.\n");
printUsage ();
exit (1);
}
FILE *fd = fopen(chainfileName,"r");
if (fd == NULL) {
fprintf (stderr, "Error opening chainfile specified ('%s').\n",chainfileName);
exit (1);
}
if ((i = sanityCheckFile(chainfileName)) != 0) {
fprintf (stderr, "Error in line number %d of Chainfile specified ('%s').\n",i,chainfileName);
exit (1);
}
if (readChainFile(fd,&cd)) {
fclose(fd);
fprintf (stderr, "Error reading chainfile ('%s').\n",chainfileName);
exit (1);
}
fclose(fd);
dbgPrintChainData(&cd);
printf("\n");
for (i=0; i< 10; i++) {
getRandomSS(&cd,&SSaddr,&SSport,&chosenLinkNum);
printf("%s,%d,%d\n",SSaddr,SSport,chosenLinkNum);
}
sendURLandChainData (&cd, urlValue);
// if (goGetFile(urlValue)) {
// DieWithError("Error retreiving URL.\n");
// }
return 0;
}
void
sendURLandChainData (struct chainData *cd, char *urlValue)
{
int sock; /* Socket descriptor */
struct sockaddr_in myServAddr; /* server address */
unsigned short myServPort; /* server port */
char rcvBuffer; /* Buffer for reply string */
int bytesRcvd, totalBytesRcvd; /* Bytes read in single recv()
and total bytes read */
struct hostent *hostentStruct; /* helper struct for gethostbyname() */
char *serverName;
char *SSaddr;
int SSport,portNumber;
int i;
char *buf;
int chosenLinkNum;
int ipAddressEntered = 1; /* flag to indicate an IP address was entered as -s arg */
struct chainData cdSend;
getRandomSS(cd,&SSaddr,&SSport,&chosenLinkNum);
/* if all digits and periods, then IP address was entered */
for (i = 0; i < strlen (SSaddr); i++)
{
if (SSaddr[i] != '.')
{
if (isdigit (SSaddr[i]) == 0)
{
ipAddressEntered = 0;
}
}
}
serverName = SSaddr;
portNumber = SSport;
/* Create a stream socket using TCP */
if ((sock = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
DieWithError ("socket() failed");
/* establish 3 seconds as the timeout value */
struct timeval tv;
tv.tv_sec = 3;
tv.tv_usec = 0;
if (setsockopt (sock, SOL_SOCKET, SO_RCVTIMEO, (char *) &tv, sizeof tv))
DieWithError ("setsockopt() failed");
/* Construct the server address structure */
memset (&myServAddr, 0, sizeof (myServAddr)); /* Zero out structure */
myServAddr.sin_family = AF_INET; /* Internet address family */
if (ipAddressEntered)
{
/* load the address */
myServAddr.sin_addr.s_addr = inet_addr (serverName);
}
else
{
/* if a hostname was entered, we need to look for IP address */
hostentStruct = gethostbyname (serverName);
if (hostentStruct == NULL)
DieWithError ("gethostbyname() failed");
/* get the correct "format" of the IP address */
serverName = inet_ntoa (*(struct in_addr *) (hostentStruct->h_addr_list[0]));
if (serverName == NULL)
{
fprintf (stderr, "inet_ntoa() failed.\n");
exit (1);
}
/* load the address */
memcpy (&myServAddr.sin_addr, hostentStruct->h_addr_list[0], hostentStruct->h_length);
}
/* load the port */
myServAddr.sin_port = htons (portNumber); /* Server port */
/* Establish the connection to the server */
if (connect (sock, (struct sockaddr *) &myServAddr, sizeof (myServAddr)) < 0)
DieWithError ("connect() failed");
/* Send the struct to the server */
chainDataAndURLToString(cd,urlValue,&buf);
if (send (sock, buf, strlen(buf), 0) != strlen(buf))
DieWithError ("send() sent a different number of bytes than expected");
/* let everyone know the URL was sent */
fprintf (stdout, "send buffer size = %d\n", strlen(buf));
fprintf (stdout, "Sent chainfile contents to server %s:%d via TCP\n", serverName, portNumber);
fprintf (stdout, "(sent)*****\n%s\n*****\n", buf);
free(buf);
/* sent the bytes to server */
/* so close things up */
if (close (sock) != 0)
DieWithError ("close() failed");
fprintf (stderr, "Send was a Success - exiting.\n");
exit (0);
}
