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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 client that connects to an SSL/SPP through a bunch of
* proxies.
*/
#include <stdbool.h> // to support boolean
#include "common.h" // common library between client and server
#include <pthread.h> // thread support
#define KEYFILE "client.pem" // client certificate
#define PASSWORD "password" // unused now
//#define DEBUG // verbose logging
#define CONNECT_TIMEOUT 5 // socket connection timeout
#define MAX_CONC_CLIENT 100 // max concurrent clients
static char *host=HOST;
static int port=PORT;
static int require_server_auth = 1;
static int clientID=0;
// -- Moved up here just because of thread
static SSL *ssl; // SSL instance
static char *proto = "ssl"; // protocol to use (ssl ; spp)
static int stats=0; // Report byte statistics boolean
void print_stats(SSL *s) ;
// Read counter of number of proxies in the provided list
int read_proxy_count(char *file_name){
FILE *fp; // pointer to file
int N; // number of proxies
char line [128]; // maximum size of line to read from
// Open file for reading
fp = fopen(file_name,"r");
// CHheck for errors while opening file
if( fp == NULL ){
printf("Error while opening file %s.\r\n", file_name);
exit(-1);
}
// Read first line of file
fgets ( line, sizeof line, fp );
// Convert char into integer
N = line[0] - '0';
#ifdef DEBUG
printf("[DEBUG] Expected number of proxies is: %d\r\n", N);
#endif
// Close file
fclose(fp);
return N;
}
// Function to read a proxy list from file and populate array of proxies
void read_proxy_list(char *file_name, SPP_PROXY **proxies){
FILE *fp; // pointer to file
int count = 0; // simple counters
bool firstLine = 1; // flag for first line in file
char line [128]; // maximum size of line to read from
// Open file for reading
fp = fopen(file_name,"r");
// Check for errors while opening file
if( fp == NULL ){
printf("Error while opening file %s.\r\n", file_name);
exit(-1);
}
// Read file line-by-line
while ( fgets ( line, sizeof line, fp ) != NULL ) {
// Remove trailing newline (NOTE: strtoK is not thread safe)
strtok(line, "\n");
// Handle first line as a special case
if (firstLine){
firstLine = 0;
continue;
}
// Generate a proxy from IP address just read
char *newLine;
newLine = (char *)malloc(strlen(line));
strcpy(newLine, line);
proxies[count] = SPP_generate_proxy(ssl, newLine);
count++;
}
// Close file
fclose(fp);
}
// Print proxy list
void print_proxy_list(SPP_PROXY **proxies, int N){
int i;
if (N == 1){
printf("[DEBUG] There is %d available proxy (the final server):\r\n", N);
}else{
printf("[DEBUG] There are %d available proxies:\r\n", N);
}
for (i = 0; i < N; i++){
printf("\t[PROXY] Proxy %d with address %s\r\n", i, proxies[i]->address);
}
}
/*
// Timeout for connect
static int sTimeout = 0;
// Handler for alarm raised by TCP connect
static void AlarmHandler(int sig) {
sTimeout = 1;
}
*/
// TCP connect function
int tcp_connect(char *host, int port){
struct hostent *hp;
struct sockaddr_in addr;
int sock;
// Resolve host
if(!(hp = gethostbyname(host))){
berr_exit("Couldn't resolve host");
}
#ifdef DEBUG
printf("[DEBUG] Host %s resolved\n", host);
#endif
memset(&addr, 0, sizeof(addr));
addr.sin_addr = *(struct in_addr*)
hp->h_addr_list[0];
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
if((sock=socket(AF_INET,SOCK_STREAM, IPPROTO_TCP))<0){
err_exit("Couldn't create socket");
}
#ifdef DEBUG
printf("[DEBUG] Socket correctly created\n");
#endif
if(connect(sock,(struct sockaddr *)&addr, sizeof(addr))<0){
err_exit("Couldn't connect socket");
}
#ifdef DEBUG
printf("[DEBUG] Socket connected\n");
#endif
/* Check solution below if we need to support a timeout -- to debug
signal(SIGALRM, AlarmHandler);
sTimeout = 0;
alarm(CONNECT_TIMEOUT);
if ( connect(sock, (struct sockaddr *) &addr, sizeof(addr)) ){
if ( sTimeout ){
err_exit("timeout connecting stream socket");
}
}
sTimeout = 0;
alarm(CONNECT_TIMEOUT);
*/
return sock;
}
/* Check that the common name matches the host name*/
void check_cert(char *host){
X509 *peer;
char peer_CN[256];
long res = SSL_get_verify_result(ssl);
if ((res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT) || (res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN)){
#ifdef DEBUG
printf("[DEBUG] Self signed certificate accepted\n");
#endif
} else {
if(res != X509_V_OK)
berr_exit("Certificate doesn't verify\n");
}
/*Check the cert chain. The chain length
is automatically checked by OpenSSL when
we set the verify depth in the ctx */
/*Check the common name*/
peer=SSL_get_peer_certificate(ssl);
X509_NAME_get_text_by_NID (X509_get_subject_name(peer), NID_commonName, peer_CN, 256);
// WARNING NO VALIDATION Validate the hostname
/*
if (1) {
printf("Peer_CN = %s\n", peer_CN);
printf("Host = %s\n\n", host);
//err_exit("Common name doesn't match host name");
}
*/
}
// Check for SSL_write error (just write at this point) -- TO DO: check behavior per slice
void check_SSL_write_error(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");
}
}
// Perform a connect
void doConnect (char *proto, int slices_len, int N_proxies, SPP_SLICE **slice_set, SPP_PROXY **proxies){
// SPP CONNECT
if (strcmp(proto, "spp") == 0){
#ifdef DEBUG
printf("[DEBUG] SPP_connect\n");
#endif
if (SPP_connect(ssl, slice_set, slices_len, proxies, N_proxies) <= 0){
berr_exit("SPP connect error");
}
}
// SSL CONNECT
if (strcmp(proto, "ssl") == 0){
#ifdef DEBUG
printf("[DEBUG] SSL_connect\n");
#endif
if(SSL_connect(ssl) <= 0)
berr_exit("SSL connect error");
}
// TO DO -- Check here
if(require_server_auth){
#ifdef DEBUG
printf("[DEBUG] Check certificate\n");
#endif
check_cert(host);
}
}
// Form and send GET
void sendRequest(char *filename){
char request[100];
int request_len;
// Form the request
memset(request, '0', sizeof(request));
sprintf(request, "Get %s HTTP/1.1\r\nUser-Agent:SVA-%d\r\nHost: %s:%d\r\n\r\n", filename, clientID, host, port);
request_len = strlen(request);
// SPP write
if (strcmp(proto, "spp") == 0){
#ifdef DEBUG
printf("[DEBUG] SPP_write\n");
#endif
int i;
for (i = 0; i < ssl->slices_len; i++){
int r = SPP_write_record(ssl, request, request_len, ssl->slices[i]);
#ifdef DEBUG
printf("Wrote %d bytes\n", r);
#endif
check_SSL_write_error(r, request_len);
}
}
// SSL write
if (strcmp(proto, "ssl") == 0){
#ifdef DEBUG
printf("[DEBUG] SSL_write\n");
#endif
int r = SSL_write(ssl, request, request_len);
check_SSL_write_error(r, request_len);
}
}
// Read file line by line with timing information
static void *browser_replay(void *ptr){
char line[128];
int previous_time = 0; // current/previous time
FILE *fp; // pointer to file
#ifdef DEBUG
printf("[DEBUG] Read file timing\n");
#endif
// Retrive filename from (void *)
char *file_name = (char *)ptr;
// Open file for reading
fp = fopen(file_name,"r");
// Check for errors while opening file
if( fp == NULL ){
printf("Error while opening file %s.\r\n", file_name);
return NULL;
}
// Read file line-by-line
while ( fgets ( line, sizeof line, fp ) != NULL ) {
double time;
//double duration;
char file_request[128];
// Remove trailing newline (NOTE: strtoK is not thread safe)
strtok(line, "\n");
#ifdef DEBUG
printf("[DEBUG] Read line is <<%s>>\n", line);
#endif
// Parse line
//sscanf(line, "%lf %lf", &time, &duration);
sscanf(line, "%lf %s", &time, file_request);
// Logging
#ifdef DEBUG
//printf("[DEBUG] Extracted values are: %f -- %f\n", time, duration);
printf("[DEBUG] Extracted values are: %f -- %s\n", time, file_request);
#endif
// Compute sleeping time
double time_to_sleep = time - previous_time;
#ifdef DEBUG
printf("[DEBUG] Sleeping for %f\n", time_to_sleep);
#endif
sleep(time_to_sleep);
// Here send timed HTTP GET
#ifdef DEBUG
//printf("[DEBUG] Sending GET request for file <<%s>>\n", file_request);
printf("[DEBUG] Sending GET request for <<%s>> bytes of data\n", file_request);
#endif
sendRequest(file_request);
// Save current time
previous_time = time;
}
#ifdef DEBUG
printf("[DEBUG] Closing file\n");
#endif
// Close file
fclose(fp);
// All good
return NULL;
}
// Emulate browser behavior based on some input traces
static int http_complex(char *proto, char *fn){
int r;
char buf[BUFSIZZ];
// Thread for browser-like behavior
pthread_t reading_thread;
if(pthread_create(&reading_thread, NULL, browser_replay, fn)) {
fprintf(stderr, "Error creating thread\n");
return -1;
}else{
#ifdef DEBUG
printf("[DEBUG] Reading thread started!\n");
#endif
}
// Now read the server's response, assuming that it's terminated by a close
while(1){
// SPP read
if (strcmp(proto, "spp") == 0){
#ifdef DEBUG
printf("[DEBUG] Waiting on SPP_read...\n");
#endif
SPP_SLICE *slice; // slice for SPP_read
SPP_CTX *ctx; // context pointer for SPP_read
r = SPP_read_record(ssl, buf, BUFSIZZ, &slice, &ctx);
#ifdef DEBUG
printf("Read %d bytes\n", r);
#endif
switch(SSL_get_error(ssl, r)){
case SSL_ERROR_NONE:
break;
case SSL_ERROR_ZERO_RETURN:
goto shutdown;
case SSL_ERROR_SYSCALL:
fprintf(stderr, "SSL Error: Premature close\n");
goto done;
default:
berr_exit("SSL read problem");
}
}
// SSL read
if (strcmp(proto, "ssl") == 0){
#ifdef DEBUG
printf("[DEBUG] Waiting on SSL_read...\n");
#endif
r = SSL_read(ssl, buf, BUFSIZZ);
switch(SSL_get_error(ssl, r)){
case SSL_ERROR_NONE:
break;
case SSL_ERROR_ZERO_RETURN:
goto shutdown;
case SSL_ERROR_SYSCALL:
fprintf(stderr, "SSL Error: Premature close\n");
goto done;
default:
berr_exit("SSL read problem");
}
}
// Write buf to stdout
#ifdef DEBUG
printf("[DEBUG] Received:\n%s\n\n", buf);
#endif
}
shutdown:
r = SSL_shutdown(ssl);
#ifdef DEBUG
printf("[DEBUG] Shutdown was requested\n");
#endif
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");
}
done:
if (stats){
print_stats(ssl);
}
SSL_free(ssl);
return(0);
}
// Send HTTP get and wait for response (SSL/SPP)
static int http_request(char *filename, char *proto, bool requestingFile){
char buf[BUFSIZZ];
int r;
int len;
// Request file (either by name or by size)
if (requestingFile){
sendRequest(filename);
}
// Now read the server's response, assuming that it's terminated by a close
while(1){
// SPP read
if (strcmp(proto, "spp") == 0){
#ifdef DEBUG
//printf("[DEBUG] SPP_read\n");
#endif
SPP_SLICE *slice; // slice for SPP_read
SPP_CTX *ctx; // context pointer for SPP_read
r = SPP_read_record(ssl, buf, BUFSIZZ, &slice, &ctx);
#ifdef DEBUG
printf("Read %d bytes\n", r);
#endif
switch(SSL_get_error(ssl, r)){
case SSL_ERROR_NONE:
len = r;
break;
case SSL_ERROR_ZERO_RETURN:
goto shutdown;
case SSL_ERROR_SYSCALL:
fprintf(stderr, "SSL Error: Premature close\n");
goto done;
default:
berr_exit("SSL read problem");
}
}
// SSL read
if (strcmp(proto, "ssl") == 0){
#ifdef DEBUG
//printf("[DEBUG] SSL_read\n");
#endif
r = SSL_read(ssl, buf, BUFSIZZ);
switch(SSL_get_error(ssl, r)){
case SSL_ERROR_NONE:
len = r;
break;
case SSL_ERROR_ZERO_RETURN:
goto shutdown;
case SSL_ERROR_SYSCALL:
fprintf(stderr, "SSL Error: Premature close\n");
goto done;
default:
berr_exit("SSL read problem");
}
}
// Write buf to stdout
#ifdef DEBUG
fwrite(buf, 1, len, stdout);
#endif
}
shutdown:
#ifdef DEBUG
printf("[DEBUG] Shutdown was requested\n");
#endif
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");
}
done:
if (stats){
print_stats(ssl);
}
SSL_free(ssl);
return(0);
}
// report "BYTE STATISITICS"
void print_stats(SSL *s) {
printf("[RESULTS] BYTE STATISITICS:\n");
printf("[RESULTS] Bytes read: %d\n", s->read_stats.bytes);
printf("[RESULTS] Application bytes read: %d\n", s->read_stats.app_bytes);
printf("[RESULTS] Block padding bytes read: %d\n", s->read_stats.pad_bytes);
printf("[RESULTS] Header bytes read: %d\n", s->read_stats.header_bytes);
printf("[RESULTS] Handshake bytes read: %d\n", s->read_stats.handshake_bytes);
printf("[RESULTS] Bytes write: %d\n", s->write_stats.bytes);
printf("[RESULTS] Application bytes write: %d\n", s->write_stats.app_bytes);
printf("[RESULTS] Block padding bytes write: %d\n", s->write_stats.pad_bytes);
printf("[RESULTS] Header bytes write: %d\n", s->write_stats.header_bytes);
printf("[RESULTS] Handshake bytes write: %d\n", s->write_stats.handshake_bytes);
}
// Usage function
void usage(void){
printf("usage: wclient -s -r -w -i -f -o -a -b\n");
printf("-s: number of slices requested (min 2, 1 for handshake 1 for rest)\n");
printf("-r: number of proxies with read access (per slice)\n");
printf("-w: number of proxies with write access (per slice)\n");
printf("-i: integrity check\n");
printf("-c: protocol chosen (ssl ; spp)\n");
printf("-o: {1=test handshake ; 2=200 OK ; 3=file transfer ; 4=browser-like behavior}\n");
printf("-f: file for http GET (either via <name> (require file to exhist) of via <size>)\n");
printf("-b: report byte statistics\n");
exit(-1);
}
/* Compute a time difference - NOTE: Return 1 if the difference is negative, otherwise 0 [now defined in the library]
int timeval_subtract(struct timeval *result, struct timeval *t2, struct timeval *t1)
{
long int diff = (t2->tv_usec + 1000000 * t2->tv_sec) - (t1->tv_usec + 1000000 * t1->tv_sec);
result->tv_sec = diff / 1000000;
result->tv_usec = diff % 1000000;
return (diff<0);
}
*/
// Main function
int main(int argc, char **argv){
SSL_CTX *ctx; // SSL context
BIO *sbio;
int sock; // socket descriptor
extern char *optarg; // user input parameters
int c; // user iput from getopt
char *filename = "proxyList"; // filename for proxy
int r = 0, w = 0; // slice related parameters
char *file_requested = "index.html"; // file requeste for HTTP GET
SPP_SLICE **slice_set; // slice array
int slices_len = 0; // number of slices
SPP_PROXY **proxies; // proxy array
int N_proxies = 0; // number of proxies in path
int action = 0; // specify client/server behavior (handshake, 200OK, serve file, browser-like)
char *file_action = NULL; // file action to use for browser-liek behavior
struct timeval tvBeginConnect;
struct timeval tvEndConnect;
struct timeval tvBegin, tvEnd;
struct timeval tvConnect, tvDuration; // time structures for handshake duration
// Handle user input parameters
while((c = getopt(argc, argv, "s:r:w:i:f:c:o:a:b:")) != -1){
switch(c){
// Number of slices
case 's': if(! (slices_len = atoi(optarg) )){
err_exit("Bogus number of slices specified (no. of slices need to be > 1)");
}
break;
// Number of proxies with read access (per slice)
case 'r': r = atoi(optarg);
break;
// Number of proxies with write access (per slice)
case 'w': w = atoi(optarg);
break;
// Integrity check requested
case 'i': require_server_auth = 0;
break;
// Protocol chosen
case 'c': if(! (proto = strdup(optarg) )){
err_exit("Out of memory");
}
if (strcmp(proto, "fwd") == 0){
proto = "ssl";
}
if (strcmp(proto, "spp_mod") == 0){
proto = "spp";
}
break;
// File requested for HTTP GET
case 'f': if(! (file_requested = strdup(optarg) )){
err_exit("Out of memory");
}
break;
// Client/Server behavior
case 'o': action = atoi(optarg);
break;
// Action file
// NOTE: necessary only if -o 4, i.e., browser-like behavior
case 'a': if(! (file_action = strdup(optarg) )){
err_exit("Out of memory");
}
break;
// Print byte statistics
case 'b': stats = atoi(optarg);
break;
// default case
default: usage();
break;
}
}
// Read number of proxy from file
N_proxies = read_proxy_count(filename);
// Check that input parameters are correct
#ifdef DEBUG
printf("[DEBUG] Parameters count: %d\n", argc);
#endif
if (argc == 1){
usage();
}
if ((strcmp(proto, "spp") == 0) && slices_len < 2){
printf("No. of slices need to be > 1 (1 for handshake and 1 for data transmission");
usage();
}
if (action < 1 || action > 4){
usage();
}
if ((strcmp(proto, "spp") != 0) && (strcmp(proto, "ssl") != 0)){
printf("Protocol type specified is not supported. Supported protocols are: spp, ssl\n");
usage();
}
if (N_proxies == 0){
printf ("At least one proxy needs to be defined, i.e., the final server\n");
usage();
}
if (r > N_proxies || w > N_proxies){
printf ("The values for r and w need to be <= than the number of proxies\n");
usage();
}
if(action == 4){
if (file_action == NULL){
printf ("Action file (-a path_to_file) is required with -o 4\n");
usage();
}
}
// Generate a clientID
time_t t;
srand((unsigned) time(&t));
clientID = rand() % MAX_CONC_CLIENT;
// Construct string for client/server behavior
char *temp_str;
if (action == 1){
temp_str = "handshake_only";
}
if (action == 2){
temp_str = "200_OK";
}
if (action == 3){
temp_str = "serve_file";
}
if (action == 4){
temp_str = "browser_like";
}
// Logging input parameters
#ifdef DEBUG
printf("[DEBUG] CLIENT-ID=%d host=%s port=%d slices=%d read=%d write=%d n_proxies=%d proto=%s action=%d(%s)\n", clientID, host, port, slices_len, r, w, N_proxies, proto, action, temp_str);
#endif
// Build SSL context
ctx = initialize_ctx(KEYFILE, PASSWORD, proto);
ssl = SSL_new(ctx);
// Allocate memory for proxies
proxies = malloc( N_proxies * sizeof (SPP_PROXY*));
// Read proxy list
read_proxy_list(filename, proxies);
// Print proxy list
#ifdef DEBUG
print_proxy_list(proxies, N_proxies);
#endif
// Create slices_n slices with incremental purpose
gettimeofday(&tvBegin, NULL);
int i;
//SPP_SLICE *slice_set[slices_len];
slice_set = malloc( slices_len * sizeof (SPP_SLICE*));
#ifdef DEBUG
printf("[DEBUG] Generating %d slices\n", slices_len);
#endif
for (i = 0; i < slices_len; i++){
char *newPurpose;
char str[30];
sprintf (str, "slices_%d", (i + 2));
newPurpose = (char *)malloc(strlen(str));
strcpy(newPurpose, str);
slice_set[i] = SPP_generate_slice(ssl, newPurpose);
#ifdef DEBUG
printf("\t[DEBUG] Generated slices %d with purpose %s\n", slice_set[i]->slice_id, slice_set[i]->purpose);
#endif
}
// Assign write access to proxies for all slices
// Find MAX between r and w
int MAX = r;
if (w > r)
MAX = w;
// Iterate among proxies
for (i = 0; i < MAX ; i++){
// assign read access if requested
if (i < r){
if (SPP_assign_proxy_read_slices(ssl, proxies[i], slice_set, slices_len) == 1 ) {
#ifdef DEBUG
printf ("[DEBUG] Proxy %s assigned read access to slice-set (READ_COUNT=%d)\n", proxies[i]->address, (i + 1));
#endif
}
}
// assign write access if requested
if (i < w){
if (SPP_assign_proxy_write_slices(ssl, proxies[i], slice_set, slices_len) == 1 ) {
#ifdef DEBUG
printf ("Proxy %s correctly assigned write access to slice-set (WRITE COUNT=%d)\n", proxies[i]->address, (i + 1));
#endif
}
}
}
// TCP Connect
char* address = (char*)malloc(strlen(proxies[0]->address)+1); // Large enough for string+\0
memcpy(address, proxies[0]->address, strlen(proxies[0]->address)+1);
host = strtok(address, ":");
port = atoi(strtok(NULL, ":"));
#ifdef DEBUG
printf("[DEBUG] Opening socket to host: %s, port %d\n", host, port);
#endif
sock = tcp_connect(host, port);
// Connect TCP socket to SSL socket
sbio = BIO_new_socket(sock, BIO_NOCLOSE);
SSL_set_bio(ssl, sbio, sbio);
// SSL Connect
gettimeofday(&tvBeginConnect, NULL);
doConnect (proto, slices_len, N_proxies, slice_set, proxies);
gettimeofday(&tvEndConnect, NULL);
timeval_subtract(&tvConnect, &tvEndConnect, &tvBeginConnect);
// Switch across possible client-server behavior
// // NOTE: here we can add more complex strategies
switch(action){
// Handshake only
case 1:
break;
// Send simple request, wait for 200 OK
case 2:
http_request(file_requested, proto, false);
gettimeofday(&tvEnd, NULL);
break;
// Send HTTP GET request and wait for file to be received
case 3:
http_request(file_requested, proto, true);
gettimeofday(&tvEnd, NULL);
break;
// Send several GET request following a browser-like behavior
case 4:
http_complex(proto, file_action);
gettimeofday(&tvEnd, NULL);
break;
// Unknown option
default:
usage();
break;
}
// Compute duration of action
if (action > 1){
timeval_subtract(&tvDuration, &tvEnd, &tvBeginConnect);
}
// Remove SSL context
destroy_ctx(ctx);
// Clode socket
close(sock);
//Free memory
for (i = 0; i < N_proxies ; i++){
free(proxies[i]);
}
for (i = 0; i < slices_len; i++){
free(slice_set[i]);
}
// Report time statistics
if (action > 1){
printf("[RESULTS] No_Slices %d Action %s Duration %ld.%06ld\n", slices_len, temp_str, tvDuration.tv_sec, tvDuration.tv_usec);
}else{
printf("[RESULTS] No_Slices %d Action %s Handshake_Dur %ld.%06ld\n", slices_len, temp_str, tvConnect.tv_sec, tvConnect.tv_usec);
}
// All good
return 0;
}