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// 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
struct timespec tps, tpe;
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;
}
if (strcmp(proto, "ssl_mod") == 0){
proto = "ssl";
disable_nagle = 1;
}
if (strcmp(proto, "fwd_mod") == 0){
proto = "fwd";
disable_nagle = 1;
}
if (strcmp(proto, "pln_mod") == 0){
proto = "pln";
disable_nagle = 1;
}
if (strcmp(proto, "fwd") == 0){
proto = "ssl";
}
break;
// Client/Server behavior
case 'o': action = atoi(optarg);
if (action == 2)
action = 3;
break;
// Control slicing strategy
case 's': if(! (strategy = strdup(optarg) )){
err_exit("Out of memory");
}
break;
// Control load estimation period
case 'l': loadTime = atoi(optarg);
break;
}
}
// Check that input parameters are correct
if (argc == 1){
usage();
}
if (action < 1 || action > 4){
usage();
}
// Logging input parameters
#ifdef DEBUG
printf("[DEBUG] Parameters count: %d\n", argc);
char *temp_str = "undefined";
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";
printf("\t[DEBUG] proto=%s; action=%d (%s)\n", proto, action, temp_str);
#endif
// Build SSL context
ctx = initialize_ctx(KEYFILE, PASSWORD, proto);
load_dh_params(ctx,DHFILE);
// Socket in listen state
sock = tcp_listen();
// Wait for client request
long finishLoadEst = (long) time (NULL) + loadTime;
int nConn = 0;
bool report = true;
while(1){
#ifdef DEBUG
printf("[DEBUG] Waiting on TCP accept...\n");
#endif
if((newsock = accept(sock, 0, 0)) < 0){
err_exit("Problem socket accept\n");
}else{
#ifdef DEBUG
printf("[DEBUG] Accepted new connection %d\n", sock);
#endif
}
// keep track of number of connections
nConn++;
// Fork a new process
signal(SIGCHLD, SIG_IGN);
pid = fork();
if (pid == 0){
/* In chil process */
if (pid == -1) {
berr_exit("FORK error");
return 1;
}
#ifdef HI_DEF_TIMER
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &tps);
#else
start = clock();
#endif
#ifdef DEBUG
printf("[DEBUG] child process close old socket and operate on new one\n");
#endif
close(sock);
if (strcmp(proto, "pln") != 0)
{
sbio = BIO_new_socket(newsock, BIO_NOCLOSE);
ssl = SSL_new(ctx);
SSL_set_bio(ssl, sbio, sbio);
// Wait on SSL Accept
if((r = SSL_accept(ssl) <= 0)){
berr_exit("SSL accept error");
} else {
#ifdef DEBUG
if (strcmp(proto, "ssl") == 0){
printf("[DEBUG] SSL accept OK\n");
}else{
printf("[DEBUG] SPP accept OK\n");
}
#endif
}
}
#ifdef HI_DEF_TIMER
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &tpe);
cpu_time_used = ( tpe.tv_sec - tps.tv_sec ) + (double)( tpe.tv_nsec - tps.tv_nsec )/ (double)1000000000L;
#else
end = clock();
cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;
#endif
if (loadTime > 0){
printf( "CPU time=%g sec\n", cpu_time_used);
}
// Switch across possible client-server behavior
// NOTE: here we can add more complex strategies
switch(action){
// Handshake only
case 1: break;
// Respond with 200 OK
case 2: http_simple_response(ssl, newsock, proto);
break;
// Serve some content
case 3: http_serve_request(ssl, newsock, proto, false, action);
break;
// Serve a browser like behavior
// NOTE
// This can only serve one connection at a time.
// Here we would need to fire a new thread
// (or re-think the code) to support multiple SSL connections
// FIXME - detect closed connection
case 4: while(1){
if (http_serve_request_browser(ssl, newsock, proto) < 0){
break;
}
}
break;
// Unknown option
default: usage();
break;
}
// Correctly end child process
#ifdef DEBUG
printf("[DEBUG] End child process (prevent zombies)\n");
#endif
exit(0);
// return 0
}else{
#ifdef DEBUG
printf("[DEBUG] parent process close new socket\n");
#endif
close(newsock);
}
}
wait(&status);
// Clean context
destroy_ctx(ctx);
// Correctly end parent process
exit(0);
}