To bring the concepts of this chapter together, we build a simple HTTPS client. This client can connect to a given HTTPS web server and request the root document /.
Our program begins by including the needed chapter header, defining main(), and initializing Winsock as shown here:
/*https_simple.c*/#include "chap09.h"int main(int argc, char *argv[]) {#if defined(_WIN32) WSADATA d; if (WSAStartup(MAKEWORD(2, 2), &d)) { fprintf(stderr, "Failed to initialize.\n"); return 1; }#endif
We then initialize the OpenSSL library with the following code:
/*https_simple.c continued*/ SSL_library_init(); OpenSSL_add_all_algorithms(); SSL_load_error_strings();
The SSL_load_error_strings() function call is optional, but it's very useful ...
