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tcp_server.c
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tcp_server.c
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#include "tcp_server.h"
SSL_CTX *create_context()
{
const SSL_METHOD *method;
SSL_CTX *ctx;
method = SSLv23_server_method();
ctx = SSL_CTX_new(method);
if (!ctx) {
perror("Unable to create SSL context");
ERR_print_errors_fp(stderr);
exit(EXIT_FAILURE);
}
return ctx;
}
void init_openssl(){
SSL_load_error_strings();
OpenSSL_add_ssl_algorithms();
SSL_library_init();
}
void cleanup_openssl()
{
EVP_cleanup();
}
/* Config SSL context */
void configure_context(SSL_CTX *ctx)
{
SSL_CTX_set_ecdh_auto(ctx, 1);
/* Set the key and cert */
if (SSL_CTX_use_certificate_file(ctx, "public.pem", SSL_FILETYPE_PEM) <= 0) {
ERR_print_errors_fp(stderr);
exit(EXIT_FAILURE);
}
if (SSL_CTX_use_PrivateKey_file(ctx, "private.pem", SSL_FILETYPE_PEM) <= 0 ) {
ERR_print_errors_fp(stderr);
exit(EXIT_FAILURE);
}
}
/* Get request and response HTTPS */
int response(int client_socket, Telegram_chat *chat_in, SSL **ssl){
unsigned int bufflen, readlen;
char buffer[BUFFER_SIZE], readBuffer[BUFFER_SIZE];
char *temp = (char *) malloc(10240);
FILE *file;
file = fopen("htdocs/index.html", "r");
/* Buffer IO Init*/
BIO *out;
BIO *ssl_bio;
ssl_bio = BIO_new(BIO_f_ssl());
out = BIO_new(BIO_s_connect());
BIO_set_ssl(ssl_bio, *ssl, BIO_CLOSE);
BIO_set_nbio(out, 1);
out = BIO_push(ssl_bio, out);
memset(readBuffer, 0, sizeof(readBuffer));
memset(temp, 0, sizeof(temp));
/* Read HTTP request Header */
printf("[HTTP Request]\n");
struct http_request request;
readlen = BIO_read(ssl_bio, readBuffer, sizeof(readBuffer));
if(readlen > 0){
prase_request(&request, readBuffer);
}
else{
return -1;
}
/* Read request body*/
unsigned int temp_length = request.content_length;
if(request.content_length > 0){
while(temp_length > 0){
readlen = BIO_read(ssl_bio, readBuffer, sizeof(readBuffer));
temp_length -= readlen;
strcat(temp, readBuffer);
}
}
bzero(readBuffer, sizeof(readBuffer));
char *http_header = (char *) malloc(256);
struct http_response response = {
.version = "HTTP/1.1",
.status_code = 200,
.status = "OK",
.content_type = "text/html",
.charset = "utf-8"
};
if(file){
response.content_length = 0;
// Content-Length
while((bufflen = fread(buffer, 1, BUFFER_SIZE, file)) > 0){
response.content_length += bufflen;
}
response_header(&response, http_header);
strcpy(buffer, http_header);
// printf("[HTTP Response]\n%s", buffer);
BIO_write(out, http_header, strlen(http_header));
rewind(file);
if(file != NULL){
while(!feof(file)){
bufflen = fread(buffer, 1, BUFFER_SIZE, file);
buffer[bufflen] = 0;
BIO_write(out, &buffer, bufflen);
}
fclose(file);
}
SSL_shutdown(*ssl);
Telegram_chat temp_chat;
if(get_telegram_chat(&temp_chat, temp) > 0){
if((int)time(NULL) - temp_chat.date > 15){
printf("[Alert!] This message id (%s) older than 15 second\n", temp_chat.msg_id);
return -1;
}
strcpy(chat_in->id, temp_chat.id);
strcpy(chat_in->msg_id, temp_chat.msg_id);
strcpy(chat_in->text, temp_chat.text);
chat_in->date = temp_chat.date;
chat_in->state = 1;
printf("\nText => %s\n", chat_in->text);
}
free(temp);
return 1;
}
}
int tcp_server(Telegram_chat *chat){
SSL *ssl;
SSL_CTX *ctx;
init_openssl();
ctx = create_context();
configure_context(ctx);
// Create server socket
int server_socket = socket(AF_INET, SOCK_STREAM, 0);
if(server_socket < 0){
perror("Unable to create socket");
return -1;
}
struct sockaddr_in server_address;
server_address.sin_family = AF_INET;
server_address.sin_port = htons(8443);
server_address.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(server_socket, (struct sockaddr *) &server_address, sizeof(server_address)) < 0){
perror("[Telegram HTTPS server] Unable to bind");
return -2;
}else{
printf("[Telegram HTTPS server] bind done\n");
}
if(listen(server_socket, 5) < 0){
perror("Unable to listen");
return -3;
}
while(1){
struct sockaddr_in client_address;
unsigned int len = sizeof(client_address);
int client_socket = accept(server_socket, (struct sockaddr *) &client_address, &len);
if (client_socket < 0) {
perror("Unable to accept");
return -4;
}
ssl = SSL_new(ctx);
SSL_set_fd(ssl, client_socket);
if (SSL_accept(ssl) <= 0) {
ERR_print_errors_fp(stderr);
}
else {
response(client_socket, chat, &ssl);
}
// SSL_shutdown(ssl);
SSL_free(ssl);
}
SSL_CTX_free(ctx);
close(server_socket);
cleanup_openssl();
return 1;
}