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/*
* Copyright (C) Telefonica 2015
* All rights reserved.
*
* Telefonica Proprietary Information.
*
* Contains proprietary/trade secret information which is the property of
* Telefonica and must not be made available to, or copied or used by
* anyone outside Telefonica without its written authorization.
*
* Authors:
* Matteo Varvello <matteo.varvello@telefonica.com> et al.
*
* Description:
* An SSL/SPP server.
*/
#include "common.h"
#include <stdbool.h>
#include <time.h>
#define KEYFILE "server.pem"
#define PASSWORD "password"
#define DHFILE "dh1024.pem"
#include <openssl/e_os2.h>
//#define DEBUG
#define MAX_PACKET 16384
static char *strategy = "uni";
static int disable_nagle = 0; //default is disabled
// Listen TCP socket
int tcp_listen(){
int sock;
struct sockaddr_in sin;
int val = 1;
// Create socket, allocate memory and set sock options
if((sock=socket(AF_INET,SOCK_STREAM,0)) < 0){
err_exit("Couldn't make socket");
}
memset(&sin, 0, sizeof(sin));
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT);
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val,sizeof(val));
if (disable_nagle == 1)
set_nagle(sock, 1);
// Bind to socket
if(bind(sock,(struct sockaddr *)&sin, sizeof(sin))<0){
berr_exit("Couldn't bind");
}
// Listen to socket
listen(sock,5);
// Return socket descriptor
return(sock);
}
// Load parameters from "dh1024.pem"
void load_dh_params(SSL_CTX *ctx, char *file){
DH *ret=0;
BIO *bio;
if ((bio=BIO_new_file(file,"r")) == NULL){
berr_exit("Couldn't open DH file");
}
ret = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
BIO_free(bio);
if(SSL_CTX_set_tmp_dh(ctx,ret) < 0){
berr_exit("Couldn't set DH parameters");
}
}
// Generate ephemeral RSA key (check DH)
void generate_eph_rsa_key(ctx)
SSL_CTX *ctx;
{
RSA *rsa;
rsa = RSA_generate_key(512, RSA_F4, NULL, NULL);
if (!SSL_CTX_set_tmp_rsa(ctx,rsa))
berr_exit("Couldn't set RSA key");
RSA_free(rsa);
}
// Compute the size of a file to be served
int calculate_file_size(char *filename){
FILE *fp;
int sz = 0;
// Open file
fp = fopen(filename,"r");
// Check for errors while opening file
if(fp == NULL){
printf("Error while opening file %s.\r\n", filename);
exit(-1);
}
// Seek to the end of the file and ask for position
fseek(fp, 0L, SEEK_END);
sz = ftell(fp);
//fseek(fp, 0L, SEEK_SET);
// Close file
fclose (fp);
// Return file size
#ifdef DEBUG
printf ("[DEBUG] File requested is <<%s>> with size <<%d bytes>>\n", filename, sz);
#endif
return sz;
}
// Function to print a prox list
void print_proxy_list(SPP_PROXY **proxies, int N){
int i;
#ifdef DEBUG
printf("[DEBUG] Print proxy list (There are %d available proxies)\r\n", N);
#endif
// Iterate through list
for (i = 0; i < N; i++){
printf("Proxy %d -- %s\r\n", i, proxies[i]->address);
}
}
// Check for SSL_write error (just write at this point) -- TO DO: check behavior per slice
void check_SSL_write_error(SSL *ssl, int r, int request_len){
switch(SSL_get_error(ssl, r)){
case SSL_ERROR_NONE:
if(request_len != r){
err_exit("Incomplete write!");
}
break;
default:
berr_exit("SSL write problem");
}
}
// splitting
void splitting (SSL *ssl, char *request, int request_len){
int beginIndex = 0, i, inc, usedSlices;
// For client/server strategy just use half slices
if (strcmp(strategy, "cs") == 0){
usedSlices = ssl->slices_len / 2;
} else{
usedSlices = ssl->slices_len;
}
// Compute increment
inc = request_len / (usedSlices);
// Slicing happens here
for (i = 0; i < usedSlices; i++){
char* dest = (char*) malloc(inc);
#ifdef DEBUG
printf("[DEBUG] Write sub-record with slice [%d ; %s]. (strategy <<%s>>)\n"\
"[DEBUG] Sub-record size is %d (beginIndex=%d -- endIndex=%d)\n", \
ssl->slices[i]->slice_id, ssl->slices[i]->purpose, strategy, inc, beginIndex, (beginIndex + inc));
#endif
memset(dest, 0, inc);
memcpy(dest, request + beginIndex, inc);
#ifdef DEBUG
printf("%s\n", dest);
#endif
int r = SPP_write_record(ssl, dest, inc, ssl->slices[i]);
#ifdef DEBUG
printf("Wrote %d bytes\n", r);
#endif
check_SSL_write_error(ssl, r, inc);
// Move pointers
beginIndex += inc;
// Increase pointer for last slice
if ( i == (usedSlices - 2)){
inc = request_len - beginIndex;
}
// free memory
free (dest);
}
}
// Send some data (SSL and SPP)
void sendData(SSL *ssl, int s, char *request, char *proto, int request_len){
int r;
//mmmm
//request_len--;
// logging
#ifdef DEBUG
printf("[DEBUG] sendData with length %d\n", request_len);
#endif
// SPP
if (strcmp(proto, "spp") == 0){
// TO DO implement further splitting here
if (request_len < ssl->slices_len){
r = SPP_write_record(ssl, request, request_len, ssl->slices[0]);
#ifdef DEBUG
printf("Wrote %d bytes\n", r);
#endif
check_SSL_write_error(ssl, r, request_len);
}else{
splitting(ssl, request, request_len);
}
}
// SSL
else if (strcmp(proto, "ssl") == 0){
r = SSL_write(ssl, request, request_len);
check_SSL_write_error(ssl, r, request_len);
}
else if (strcmp(proto, "pln") == 0){
r = write(s, request, request_len);
}
}
// Simple test for SPP handshake
static int http_simple_response(SSL *ssl, int s, char *proto){
int i;
#ifdef DEBUG
printf("[DEBUG] HTTP test simple response\n");
#endif
#ifdef DEBUG
printf("[DEBUG] Verify proxies and slices were correctly received\n");
if (strcmp(proto, "spp") == 0){
// Print proxies
for (i = 0; i < ssl->proxies_len; i++){
printf("\t[DEBUG] Proxy: %s\n", ssl->proxies[i]->address);
}
// print slices
for (i = 0; i < ssl->slices_len; i++){
printf("\t[DEBUG] Slice with ID %d and purpose %s\n", ssl->slices[i]->slice_id, ssl->slices[i]->purpose);
}
}
#endif
// put 200 OK on the wire
char *data = "HTTP/1.0 200 OK\r\n";
int request_len = strlen(data);
sendData(ssl, s, data, proto, request_len);
if (strcmp(proto, "pln") != 0)
{
// Shutdown SSL - TO DO (check what happens here)
int r = SSL_shutdown(ssl);
if( !r ){
shutdown(s, 1);
r = SSL_shutdown(ssl);
}
// Verify that shutdown was good
switch(r){
case 1:
break; // Success
case 0:
case -1:
default: // Error
#ifdef DEBUG
printf ("Shutdown failed with code %d\n", r);
#endif
berr_exit("Shutdown failed");
}
// free SSL
SSL_free(ssl);
}
// All good
return 0;
}
// Parse HTTP GET request to get filename
char* parse_http_get(char *buf){
char *delim="\r\n";
char *token = strtok(buf , delim);
delim=" ";
char *fn = strtok(token, delim);
fn = strtok(NULL, delim);
return fn;
}
// Serve some data in browser mode, just for SPP protocol
int serveDataSPPBrowser(SSL *ssl, int s, int data_size, char *proto, long *resp_len_arr, int arr_len){
int i;
for (i = 0; i < ssl->slices_len; i++){
long still_to_send = 0;
if (i >= arr_len) {
printf("Error! no data specified to send for slice.\n");
} else {
still_to_send = resp_len_arr[i];
}
if (still_to_send > 0){
#ifdef DEBUG
printf ("[DEBUG] %d bytes to be sent with slice %d\n", still_to_send, i);
#endif
for (;;){
// Derive min between how much to send and max buffer size
long toSend = BUFTLS;
if (still_to_send < toSend){
toSend = still_to_send;
}
//Allocate buffer with size to send and fill with "!"
#ifdef DEBUG
printf ("[DEBUG] Allocating buffer with %d data\n", toSend);
#endif
char *buf = (char*) malloc(sizeof(char) * toSend);
memset(buf, '!', sizeof(char) * toSend);
#ifdef VERBOSE
// printf ("[DEBUG] Buffer=\n%s\n", buf);
#endif
// send data on slice i
int r = SPP_write_record(ssl, buf, toSend, ssl->slices[i]);
#ifdef DEBUG
printf("Wrote %d bytes\n", r);
#endif
check_SSL_write_error(ssl, r, toSend);
// Update how much content is still to send
still_to_send -= toSend;
if (still_to_send == 0){
#ifdef DEBUG
printf ("[DEBUG] No more data to send for slice %d\n", i);
#endif
break;
}
// Free buffer
free(buf);
}
}else{
#ifdef DEBUG
printf ("[DEBUG] Nothing to be sent with slice %d\n", i);
#endif
}
}
// All good
return 0;
}
// Serve a given amount of data
int serveData(SSL *ssl, int s, int data_size, char *proto){
// Logging
#ifdef DEBUG
printf ("[DEBUG] Requested data with size %d\n", data_size);
#endif
// Send data via SPP/SSL
int still_to_send = data_size;
for (;;){
// Derive min between how much to send and max buffer size
int toSend = BUFTLS;
if (still_to_send < toSend){
toSend = still_to_send;
}
//Allocate buffer with size to send and fill with "!"
char *buf = (char*) malloc(sizeof(char) * toSend);
memset(buf, '!', sizeof(char) * toSend);
#ifdef VERBOSE
printf ("[DEBUG] Buffer=\n%s\n", buf);
#endif
// Send <<buf>> on SPP/SSL connection
if (strcmp(proto, "spp") == 0){
sendData(ssl, s, buf, proto, sizeof(char) * toSend);
}
if (strcmp(proto, "ssl") == 0){
int r = SSL_write(ssl, buf, toSend);
check_SSL_write_error(ssl, r, toSend);
}
if (strcmp(proto, "pln") == 0){
sendData(ssl, s, buf, proto, sizeof(char) * toSend);
}
// Update how much content is still to send
still_to_send -= toSend;
if (still_to_send == 0){
#ifdef DEBUG
printf ("[DEBUG] No more data to send\n");
#endif
break;
}
// Free buffer
free(buf);
}
// All good
return 0;
}
// Serve a file -- solution extracted from original s_client
// NOTES: (1) modified not to use BIO ; (2) re-negotiation currently not used
int serveFile(SSL *ssl, int s, char *filename, char *proto){
FILE *fp; // file descriptot
int file_size = 0; // size of file being sent
// Open requested file for reading
if ((fp = fopen(filename,"r")) == NULL){
#ifdef DEBUG
printf ("File <<%s>> do not exist\n", filename);
#endif
char *data = "Error opening file\r\n";
int request_len = strlen(data);
sendData(ssl, s, data, proto, request_len);
fclose(fp);
return -1;
}else{
// Calculate file size
// Seek to the end of the file and ask for position
fseek(fp, 0L, SEEK_END);
file_size = ftell(fp);
// Seek to the beginning of the file
fseek(fp, 0L, SEEK_SET);
#ifdef DEBUG
printf ("[DEBUG] File requested is <<%s>> with size <<%d bytes>>\n", filename, file_size);
#endif
}
// Allocate buffer for data to send
char* buf = (char*) malloc (file_size);
// Read "toSend" content from file
int i = fread(buf, file_size, 1, fp);
// Check for end of file
if (i <= 0){
#ifdef DEBUG
printf("[DEBUG] Done reading file %s\n", filename);
#endif
}else{
#ifdef DEBUG
printf("[DEBUG] Still some data to read? (read result = %d)\n", i);
#endif
}
// Send <<buf>> on SPP/SSL connection
sendData(ssl, s, buf, proto, file_size);
// Close file
fclose(fp);
// All good
return 0;
}
// serve requests in browser-like mode
static int http_serve_request_browser(SSL *ssl, int s, char *proto){
int r;
char buf[BUFSIZZ];
// Clean buffer
memset(buf, 0, sizeof(buf));
// Read HTTP GET (assuming a single read is enough)
while(1){
if (strcmp(proto, "pln") == 0){
r = read(s, buf, BUFSIZZ);
if (r < 0){
berr_exit("[ERROR] TCP read problem - exit");
}
} else{
if (strcmp(proto, "spp") == 0){
SPP_SLICE *slice;
SPP_CTX *ctx;
r = SPP_read_record(ssl, buf, BUFSIZZ, &slice, &ctx);
} else if (strcmp(proto, "ssl") == 0){
r = SSL_read(ssl, buf, BUFSIZZ);
}
long error = SSL_get_error(ssl, r);
if ( error == SSL_ERROR_ZERO_RETURN){
#ifdef DEBUG
printf("[DEBUG] Client closed the connection\n");
#endif
return -1;
} else if (error != SSL_ERROR_NONE){
char tempBuf[100];
ERR_error_string(error, tempBuf);
//berr_exit("[ERROR] SSL read problem - exit");
#ifdef DEBUG
printf("[DEBUG] Client closed the connection or error %s\n", tempBuf);
#endif
return -1;
}
}
#ifdef DEBUG
printf("[DEBUG] Request contains %d bytes:\n%s\n", r, buf);
#endif
//Look for the blank line that signals the end of the HTTP header (FIXME: assume 1 read is enough)
if(strstr(buf, "\r\n") || strstr(buf, "\n")){
break;
}else{
return 0;
}
}
// Parsing
char *delim="\r\n";
char *token = strtok(buf , delim);
delim=" ";
char *fn = strtok(token, delim);
fn = strtok(NULL, delim);
#ifdef DEBUG
printf("[DEBUG] List of requested slice sizes: %s\n", fn);
#endif
// data structures to store sizes of responses
long response_len = 0;
// extract list of response sizes
char s_Token[15][25];
memset(s_Token, 0, 375);
int i;
int count = TokenizeString(fn, s_Token, '_');
#ifdef DEBUG
printf("[DEBUG] Found %d tokens\n", count);
for (i=0; i <count; i++) {
printf("%s ", s_Token[i]);
}
printf("\n");
#endif
long resp_len_arr[count];
for(i=0; i < count; i++){
resp_len_arr[i] = atol(s_Token[i]);
response_len += resp_len_arr[i];
#ifdef DEBUG
printf("[DEBUG] Requested Slice %d with size %ld\n", i, resp_len_arr[i]);
#endif
}
#ifdef DEBUG
printf("[DEBUG] Total size is %ld\n", response_len);
#endif
// serve requested data
if (strcmp(proto, "spp") == 0){
serveDataSPPBrowser(ssl, s, response_len, proto, resp_len_arr, count);
} else {
// use classic method to serve data if not SPP
#ifdef DEBUG
printf("[DEBUG] Classic method to serve %ld data\n", response_len);
#endif
serveData(ssl, s, response_len, proto);
}
// All good
return 0;
}
// Serve a file -- solution extracted from original s_client
// NOTES: (1) modified not to use BIO ; (2) re-negotiation currently not used
int serveFile_old(SSL *ssl, int s, char *filename, char *proto){
FILE *fp; // file descriptot
char buf[BUFSIZZ]; // buffer for data to send
int file_size = 0; // size of file being sent
int still_to_send; // amount of data from file still to be sent
// Open requested file for reading
if ((fp = fopen(filename,"r")) == NULL){
#ifdef DEBUG
printf ("File <<%s>> do not exist\n", filename);
#endif
char *data = "Error opening file\r\n";
int request_len = strlen(data);
sendData(ssl, s, data, proto, request_len);
fclose(fp);
return -1;
}else{
// Calculate file size
// Seek to the end of the file and ask for position
fseek(fp, 0L, SEEK_END);
file_size = ftell(fp);
// Seek to the beginning of the file
fseek(fp, 0L, SEEK_SET);
#ifdef DEBUG
printf ("[DEBUG] File requested is <<%s>> with size <<%d bytes>>\n", filename, file_size);
#endif
}
// Transfer file via SPP/SSL
still_to_send = file_size;
for (;;){
// Derive min between how much to send and max buffer size
int toSend = BUFSIZZ;
if (still_to_send < toSend){
toSend = still_to_send;
}
// Read "toSend" content from file
int i = fread(buf, toSend, 1, fp);
// Check for end of file
if (i <= 0){
#ifdef DEBUG
printf("[DEBUG] Done reading file %s\n", filename);
#endif
break;
}else{
#ifdef DEBUG
printf("[DEBUG] Read %d bytes from file\n", toSend);
#endif
}
// Update how much content is still to send
still_to_send -= (i * toSend);
// Send <<buf>> on SPP/SSL connection
if (strcmp(proto, "spp") == 0){
int request_len = strlen(buf);
sendData(ssl, s, buf, proto, request_len);
}
if (strcmp(proto, "ssl") == 0){
int r = SSL_write(ssl, buf, toSend);
check_SSL_write_error(ssl, r, toSend);
}
}
// Close file
fclose(fp);
/* CODE FOR RENOGOTIATION
// Check if too many losses
if (total_bytes > (3 * file_size)){
total_bytes = 0;
fprintf(stderr,"RENEGOTIATE\n");
SSL_renegotiate(ssl);
}
// Renegotiation if too many lossed
for (j = 0; j < i; ){
// After 13 attempts, re-negotate at SSL level
static int count = 0;
if (++count == 13) {
SSL_renegotiate(ssl);
}
int r = SSL_write(ssl, buf, BUFSIZZ);
check_SSL_write_error(ssl, r, BUFSIZZ);
//int k = BIO_write(io, &(buf[j]), i-j);
if (k <= 0){
if (! BIO_should_retry(io)){
goto write_error;
}else {
BIO_printf(io, "rewrite W BLOCK\n");
}
}else{
j += k;
}
write_error:
BIO_free(file);
break;
}
if((r = BIO_flush(io))<0){
err_exit("Error flushing BIO");
}
} // end for loop
*/
// All good
return 0;
}
// 1) work with both SSL and SPP
// 2) no usage of BIO APIs
static int http_serve_request(SSL *ssl, int s, char *proto, bool shut, int action){
int r;
char buf[BUFSIZZ];
char *filename = "";
int ret_value = 0;
// Read HTTP GET (assuming a single read is enough)
while(1){
if (strcmp(proto, "spp") == 0){
SPP_SLICE *slice;
SPP_CTX *ctx;
r = SPP_read_record(ssl, buf, BUFSIZZ, &slice, &ctx);
if (SSL_get_error(ssl, r) != SSL_ERROR_NONE)
berr_exit("[DEBUG] SSL read problem");
#ifdef DEBUG
printf("[DEBUG] Read %d bytes\n", r);
#endif
}
else if (strcmp(proto, "ssl") == 0){
r = SSL_read(ssl, buf, BUFSIZZ);
if (SSL_get_error(ssl, r) != SSL_ERROR_NONE)
berr_exit("[DEBUG] SSL read problem");
}
else if (strcmp(proto, "pln") == 0){
r = read(s, buf, BUFSIZZ);
}
#ifdef DEBUG
printf("[DEBUG] Request received:\n");
printf("%s\n", buf);
#endif
//Look for the blank line that signals the end of the HTTP header
if(strstr(buf, "\r\n") || strstr(buf, "\n")){
break;
}
}
// Parse filename from HTTP GET
filename = parse_http_get(buf);
int fSize = atoi(filename);
if (fSize != 0 || filename[0] == '0'){
#ifdef DEBUG
printf("[DEBUG] File requested by size <<%d>>\n", fSize);
#endif
} else {
#ifdef DEBUG
printf("[DEBUG] File requested by name <<%s>>\n", filename);
#endif
}
// Simple trick to end
if (strcmp(filename, "-1") == 0){
#ifdef DEBUG
printf("[DEBUG] Client requested to end session\n");
#endif
ret_value = -1;
shut = true;
}else{
// Serve requested file either by name or by size
if (action == 3){
if (fSize == 0){
serveFile(ssl, s, filename, proto);
} else {
serveData(ssl, s, fSize, proto);
}
}
if (action == 4){
// convert filename into data size
int data_size;
sscanf(filename, "%d", &data_size);
// serve data with size above
serveData(ssl, s, data_size, proto);
}
}
// Do not shutdown TLS for browser-like behavior unless requested -- FIXME (NEVER SHUTDOWN)
if (shut){
#ifdef DEBUG
printf("[DEBUG] Shutdown SSL connection\n");
#endif
// Shutdown SSL - TO DO (check what happens here)
r = SSL_shutdown(ssl);
if( !r ){
shutdown(s, 1);
r = SSL_shutdown(ssl);
}
// Verify that all went good
switch(r){
case 1:
break; // Success
case 0:
case -1:
default: // Error
#ifdef DEBUG
printf ("Shutdown failed with code %d\n", r);
#endif
berr_exit("Shutdown failed");
}
// free SSL
SSL_free(ssl);
// Close socket
close(s);
}else{
#ifdef DEBUG
printf("[DEBUG] No shutdown since SSL connection might still be used\n");
#endif
}
// All good
return ret_value;
}
// SSL http serve (almost original function)
static int http_serve_SSL(SSL *ssl, int s){
char buf[BUFSIZZ];
int r; //len; //len seems useless...
BIO *io,*ssl_bio;
io = BIO_new(BIO_f_buffer());
ssl_bio = BIO_new(BIO_f_ssl());
BIO_set_ssl(ssl_bio, ssl, BIO_CLOSE);
BIO_push(io, ssl_bio);
while(1){
r = BIO_gets(io, buf, BUFSIZZ-1);
if (SSL_get_error(ssl, r) == SSL_ERROR_NONE){
} else {
berr_exit("SSL read problem");
}
//Look for the blank line that signals the end of the HTTP headers //
if(!strcmp(buf, "\r\n") || !strcmp(buf, "\n")){
break;
}
}
// Put 200 OK on the wire
if((r = BIO_puts (io, "HTTP/1.0 200 OK\r\n")) <= 0){
err_exit("Write error");
}
// Put server name on the wire
if((r = BIO_puts (io,"Server: Svarvel\r\n\r\n")) <= 0){
err_exit("Write error");
}
if((r=BIO_puts (io,"Server test page\r\n"))<=0){
err_exit("Write error");
}
// Send file index.html -- TO DO, extend to a requested name
BIO *file;
static int bufsize = BUFSIZZ;
int total_bytes = 0, j = 0, file_size = 0;
// Determine file size -- TO DO: integration with BIO stuff
file_size = calculate_file_size("index.html");
// Open requested file
if ((file = BIO_new_file("index.html","r")) == NULL){
BIO_puts(io, "Error opening file"); // what is text? ERROR
BIO_printf(io,"Error opening index.html\r\n");
goto write_error;
}
// Put file on the wire
for (;;){
// Read bufsize from requested file
int i = BIO_read(file, buf, bufsize);
if (i <= 0){
break;
}
// Keep count of bytes sent on the wire
total_bytes += i;
// Check if too many losses
if (total_bytes > (3 * file_size)){
total_bytes = 0;
fprintf(stderr,"RENEGOTIATE\n");
SSL_renegotiate(ssl);
}
// ??
for (j = 0; j < i; ){
// After 13 attempts, re-negotate at SSL level
static int count = 0;
if (++count == 13) {
SSL_renegotiate(ssl);
}
int k = BIO_write(io, &(buf[j]), i-j);
if (k <= 0){
if (! BIO_should_retry(io)){
goto write_error;
}else {
BIO_printf(io, "rewrite W BLOCK\n");
}
}else{
j += k;
}
write_error:
BIO_free(file);
break;
}
if((r = BIO_flush(io))<0){
err_exit("Error flushing BIO");
}
r = SSL_shutdown(ssl);
if( !r ){
/* If we called SSL_shutdown() first then
we always get return value of '0'. In
this case, try again, but first send a
TCP FIN to trigger the other side's
close_notify*/
shutdown(s,1);
r = SSL_shutdown(ssl);
}
switch(r){
case 1:
break; /* Success */
case 0:
case -1:
default:
#ifdef DEBUG
printf ("Shutdown failed with code %d\n", r);
#endif
berr_exit("Shutdown failed");
}
} // end for loop
SSL_free(ssl);
close(s);
return(0);
}
// Usage function
void usage(void){
printf("usage: wserver -c -o -s\n");
printf("-c: protocol requested: ssl, spp, pln, fwd, spp-mod, ssl-mod, pln-mod, fwd-mod.\n");
printf("-o: {1=test handshake ; 2=200 OK ; 3=file transfer ; 4=browser-like behavior}\n");
printf("-s: content slicing strategy {uni; cs}\n");
printf("-l: duration of load estimation time (10 sec default)\n");
printf("{uni[DEFAUL]=split response equally among slices ; cs=split uniformly among half slices, assuming other half is used by the client}\n");
exit(-1);
}
// Main function
int main(int argc, char **argv){
int sock, newsock; // socket descriptors
BIO *sbio;
SSL_CTX *ctx;
SSL *ssl;
int r;
pid_t pid;
char *proto; // protocol type
extern char *optarg; // user input parameters
int c; // user iput from getopt
int action = 0; // specify client/server behavior (handshake, 200OK, serve file, browser-like)
int status; // ...
clock_t start, end; // timers for cpu time estimation
double cpu_time_used; // cpu time used
int loadTime = 10; // time used for load estimation (10 second default, user can change with option -l)
// Handle user input parameters
while((c = getopt(argc, argv, "c:o:s:l:")) != -1){
switch(c){
// Protocol
case 'c': if(! (proto = strdup(optarg) )){
err_exit("Out of memory");
}
if (strcmp(proto, "spp_mod") == 0){
proto = "spp";
disable_nagle = 1;