Thread: SSL Socket fork()

Hi,

I've been trying to create an C SSL Socket listener. I've successfully been able to accept connections (take input, send a response, then disconnect). However, I am now trying to use fork() to allow for multiple simultaneous connections. My code is below: (any help figuring this out is appreciated)
server.c

Code:

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <resolv.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include "server.h"
void initChild(int client, SSL_CTX* ctx);

void error(const char *msg) {
	perror(msg);
	exit(1);
}

int main(int count, char *strings[])
{   SSL_CTX *ctx;
    int server;
    char *portnum;
	int pid;
    if ( count != 2 )
    {
        printf("Usage: %s <portnum>\n", strings[0]);
        exit(0);
    }
	SSL_library_init();
    portnum = strings[1];
	ctx = InitServerCTX();											/* initialize SSL */  
  	LoadCertificates(ctx, "keys/mycert.pem", "keys/server.key");	/* load certs */
    server = OpenListener(atoi(portnum));							/* create server socket */
	while (1) {
		struct sockaddr_in addr;
	    int len = sizeof(addr);
        int client = accept(server, (struct sockaddr*)&addr, &len);		/* accept connection as usual */
		
		if(!(pid = fork())) {
			// Child process
			//close(server);
			initChild(client, ctx);	
			exit(0);
		} else if(pid > 0) {
			// Parent process
		} else {
			// Fork failed
			//close(server);
		}
	}
	close(server);
	SSL_CTX_free(ctx);	

	return 0;
}
void initChild(int client, SSL_CTX* ctx) {
	printf("Doing some stuff");
	SSL ........l;
	ssl = SSL_new(ctx);         									/* get new SSL state with context */	
	SSL_set_fd(ssl, client);										/* set connection socket to SSL state */
	//sd = SSL_get_fd(ssl);							/* get socket connection */
    //SSL_free(ssl);									/* release SSL state */
    //close(sd);
	//close(client);
    Servlet(ssl);

}

server.h

Code:

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <resolv.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

#define FAIL    -1

/*---------------------------------------------------------------------*/
/*--- OpenListener - create server socket                           ---*/
/*---------------------------------------------------------------------*/
int OpenListener(int port)
{   int sd;
    struct sockaddr_in addr;

    sd = socket(PF_INET, SOCK_STREAM, 0);
    bzero(&addr, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    addr.sin_addr.s_addr = INADDR_ANY;
    if ( bind(sd, (struct sockaddr*)&addr, sizeof(addr)) != 0 )
    {
        perror("can't bind port");
        abort();
    }
    if ( listen(sd, 10) != 0 )
    {
        perror("Can't configure listening port");
        abort();
    }
    return sd;
}

/*---------------------------------------------------------------------*/
/*--- InitServerCTX - initialize SSL server  and create context     ---*/
/*---------------------------------------------------------------------*/
SSL_CTX* InitServerCTX(void)
{   SSL_METHOD *method;
    SSL_CTX *ctx;

    OpenSSL_add_all_algorithms();		/* load & register all cryptos, etc. */
    SSL_load_error_strings();			/* load all error messages */
    method = SSLv2_server_method();		/* create new server-method instance */
    ctx = SSL_CTX_new(method);			/* create new context from method */
    if ( ctx == NULL )
    {
        ERR_print_errors_fp(stderr);
        abort();
    }
    return ctx;
}

/*---------------------------------------------------------------------*/
/*--- LoadCertificates - load from files.                           ---*/
/*---------------------------------------------------------------------*/
void LoadCertificates(SSL_CTX* ctx, char* CertFile, char* KeyFile)
{
	/* set the local certificate from CertFile */
    if ( SSL_CTX_use_certificate_file(ctx, CertFile, SSL_FILETYPE_PEM) <= 0 )
    {
        ERR_print_errors_fp(stderr);
        abort();
    }
    /* set the private key from KeyFile (may be the same as CertFile) */
    if ( SSL_CTX_use_PrivateKey_file(ctx, KeyFile, SSL_FILETYPE_PEM) <= 0 )
    {
        ERR_print_errors_fp(stderr);
        abort();
    }
    /* verify private key */
    if ( !SSL_CTX_check_private_key(ctx) )
    {
        fprintf(stderr, "Private key does not match the public certificate\n");
        abort();
    }
}

/*---------------------------------------------------------------------*/
/*--- ShowCerts - print out certificates.                           ---*/
/*---------------------------------------------------------------------*/
void ShowCerts(SSL* ssl)
{   X509 *cert;
    char *line;

    cert = SSL_get_peer_certificate(ssl);	/* Get certificates (if available) */
    if ( cert != NULL )
    {
        printf("Server certificates:\n");
        line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
        printf("Subject: %s\n", line);
        free(line);
        line = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0);
        printf("Issuer: %s\n", line);
        free(line);
        X509_free(cert);
    }
    else
        printf("No certificates.\n");
}

/*---------------------------------------------------------------------*/
/*--- Servlet - SSL servlet (contexts can be shared)                ---*/
/*---------------------------------------------------------------------*/
void Servlet(SSL* ssl)	/* Serve the connection -- threadable */
{   char buf[1024];
    char reply[1024];
    int sd, bytes;
    const char* HTMLecho="<html><body><pre>The message \"<strong>%s</strong>\" has been received!</pre></body></html>\n\n";

    if ( SSL_accept(ssl) == FAIL )					/* do SSL-protocol accept */
        ERR_print_errors_fp(stderr);
    else
    {
        ShowCerts(ssl);								/* get any certificates */
        bytes = SSL_read(ssl, buf, sizeof(buf));	/* get request */
        if ( bytes > 0 )
        {
            buf[bytes] = 0;
            printf("Client msg: \"%s\"\n", buf);
            sprintf(reply, HTMLecho, buf);			/* construct reply */
            SSL_write(ssl, reply, strlen(reply));	/* send reply */
        }
        else
            ERR_print_errors_fp(stderr);
    }
    sd = SSL_get_fd(ssl);							/* get socket connection */
    SSL_free(ssl);									/* release SSL state */
    close(sd);										/* close connection */
}