bss_conn.c

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/* crypto/bio/bss_conn.c */
/* Copyright (C) 1995-1998 Eric Young ([e-mail])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([e-mail]).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson ([e-mail]).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young ([e-mail])"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson ([e-mail])"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <errno.h>
#define USE_SOCKETS
#include "cryptlib.h"
#include <openssl/bio.h>

#ifndef OPENSSL_NO_SOCK

#ifdef OPENSSL_SYS_WIN16
#define SOCKET_PROTOCOL 0 /* more microsoft stupidity */
#else
#define SOCKET_PROTOCOL IPPROTO_TCP
#endif

#if (defined(OPENSSL_SYS_VMS) && __VMS_VER < 70000000)
/* FIONBIO used as a switch to enable ioctl, and that isn't in VMS < 7.0 */
#undef FIONBIO
#endif


typedef struct bio_connect_st
	{
	int state;

	char *param_hostname;
	char *param_port;
	int nbio;

	unsigned char ip[4];
	unsigned short port;

	struct sockaddr_in them;

	/* int socket; this will be kept in bio->num so that it is
	 * compatible with the bss_sock bio */ 

	/* called when the connection is initially made
	 *  callback(BIO,state,ret);  The callback should return
	 * 'ret'.  state is for compatibility with the ssl info_callback */
	int (*info_callback)(const BIO *bio,int state,int ret);
	} BIO_CONNECT;

static int conn_write(BIO *h, const char *buf, int num);
static int conn_read(BIO *h, char *buf, int size);
static int conn_puts(BIO *h, const char *str);
static long conn_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int conn_new(BIO *h);
static int conn_free(BIO *data);
static long conn_callback_ctrl(BIO *h, int cmd, bio_info_cb *);

static int conn_state(BIO *b, BIO_CONNECT *c);
static void conn_close_socket(BIO *data);
BIO_CONNECT *BIO_CONNECT_new(void );
void BIO_CONNECT_free(BIO_CONNECT *a);

static BIO_METHOD methods_connectp=
	{
	BIO_TYPE_CONNECT,
	"socket connect",
	conn_write,
	conn_read,
	conn_puts,
	NULL, /* connect_gets, */
	conn_ctrl,
	conn_new,
	conn_free,
	conn_callback_ctrl,
	};

static int conn_state(BIO *b, BIO_CONNECT *c)
	{
	int ret= -1,i;
	unsigned long l;
	char *p,*q;
	int (*cb)(const BIO *,int,int)=NULL;

	if (c->info_callback != NULL)
		cb=c->info_callback;

	for (;;)
		{
		switch (c->state)
			{
		case BIO_CONN_S_BEFORE:
			p=c->param_hostname;
			if (p == NULL)
				{
				BIOerr(BIO_F_CONN_STATE,BIO_R_NO_HOSTNAME_SPECIFIED);
				goto exit_loop;
				}
			for ( ; *p != '\0'; p++)
				{
				if ((*p == ':') || (*p == '/')) break;
				}

			i= *p;
			if ((i == ':') || (i == '/'))
				{

				*(p++)='\0';
				if (i == ':')
					{
					for (q=p; *q; q++)
						if (*q == '/')
							{
							*q='\0';
							break;
							}
					if (c->param_port != NULL)
						OPENSSL_free(c->param_port);
					c->param_port=BUF_strdup(p);
					}
				}

			if (c->param_port == NULL)
				{
				BIOerr(BIO_F_CONN_STATE,BIO_R_NO_PORT_SPECIFIED);
				ERR_add_error_data(2,"host=",c->param_hostname);
				goto exit_loop;
				}
			c->state=BIO_CONN_S_GET_IP;
			break;

		case BIO_CONN_S_GET_IP:
			if (BIO_get_host_ip(c->param_hostname,&(c->ip[0])) <= 0)
				goto exit_loop;
			c->state=BIO_CONN_S_GET_PORT;
			break;

		case BIO_CONN_S_GET_PORT:
			if (c->param_port == NULL)
				{
				/* abort(); */
				goto exit_loop;
				}
			else if (BIO_get_port(c->param_port,&c->port) <= 0)
				goto exit_loop;
			c->state=BIO_CONN_S_CREATE_SOCKET;
			break;

		case BIO_CONN_S_CREATE_SOCKET:
			/* now setup address */
			memset((char *)&c->them,0,sizeof(c->them));
			c->them.sin_family=AF_INET;
			c->them.sin_port=htons((unsigned short)c->port);
			l=(unsigned long)
				((unsigned long)c->ip[0]<<24L)|
				((unsigned long)c->ip[1]<<16L)|
				((unsigned long)c->ip[2]<< 8L)|
				((unsigned long)c->ip[3]);
			c->them.sin_addr.s_addr=htonl(l);
			c->state=BIO_CONN_S_CREATE_SOCKET;

			ret=socket(AF_INET,SOCK_STREAM,SOCKET_PROTOCOL);
			if (ret == INVALID_SOCKET)
				{
				SYSerr(SYS_F_SOCKET,get_last_socket_error());
				ERR_add_error_data(4,"host=",c->param_hostname,
					":",c->param_port);
				BIOerr(BIO_F_CONN_STATE,BIO_R_UNABLE_TO_CREATE_SOCKET);
				goto exit_loop;
				}
			b->num=ret;
			c->state=BIO_CONN_S_NBIO;
			break;

		case BIO_CONN_S_NBIO:
			if (c->nbio)
				{
				if (!BIO_socket_nbio(b->num,1))
					{
					BIOerr(BIO_F_CONN_STATE,BIO_R_ERROR_SETTING_NBIO);
					ERR_add_error_data(4,"host=",
						c->param_hostname,
						":",c->param_port);
					goto exit_loop;
					}
				}
			c->state=BIO_CONN_S_CONNECT;

#if defined(SO_KEEPALIVE) && !defined(OPENSSL_SYS_MPE)
			i=1;
			i=setsockopt(b->num,SOL_SOCKET,SO_KEEPALIVE,(char *)&i,sizeof(i));
			if (i < 0)
				{
				SYSerr(SYS_F_SOCKET,get_last_socket_error());
				ERR_add_error_data(4,"host=",c->param_hostname,
					":",c->param_port);
				BIOerr(BIO_F_CONN_STATE,BIO_R_KEEPALIVE);
				goto exit_loop;
				}
#endif
			break;

		case BIO_CONN_S_CONNECT:
			BIO_clear_retry_flags(b);
			ret=connect(b->num,
				(struct sockaddr *)&c->them,
				sizeof(c->them));
			b->retry_reason=0;
			if (ret < 0)
				{
				if (BIO_sock_should_retry(ret))
					{
					BIO_set_retry_special(b);
					c->state=BIO_CONN_S_BLOCKED_CONNECT;
					b->retry_reason=BIO_RR_CONNECT;
					}
				else
					{
					SYSerr(SYS_F_CONNECT,get_last_socket_error());
					ERR_add_error_data(4,"host=",
						c->param_hostname,
						":",c->param_port);
					BIOerr(BIO_F_CONN_STATE,BIO_R_CONNECT_ERROR);
					}
				goto exit_loop;
				}
			else
				c->state=BIO_CONN_S_OK;
			break;

		case BIO_CONN_S_BLOCKED_CONNECT:
			i=BIO_sock_error(b->num);
			if (i)
				{
				BIO_clear_retry_flags(b);
				SYSerr(SYS_F_CONNECT,i);
				ERR_add_error_data(4,"host=",
					c->param_hostname,
					":",c->param_port);
				BIOerr(BIO_F_CONN_STATE,BIO_R_NBIO_CONNECT_ERROR);
				ret=0;
				goto exit_loop;
				}
			else
				c->state=BIO_CONN_S_OK;
			break;

		case BIO_CONN_S_OK:
			ret=1;
			goto exit_loop;
		default:
			/* abort(); */
			goto exit_loop;
			}

		if (cb != NULL)
			{
			if (!(ret=cb((BIO *)b,c->state,ret)))
				goto end;
			}
		}

	/* Loop does not exit */
exit_loop:
	if (cb != NULL)
		ret=cb((BIO *)b,c->state,ret);
end:
	return(ret);
	}

BIO_CONNECT *BIO_CONNECT_new(void)
	{
	BIO_CONNECT *ret;

	if ((ret=(BIO_CONNECT *)OPENSSL_malloc(sizeof(BIO_CONNECT))) == NULL)
		return(NULL);
	ret->state=BIO_CONN_S_BEFORE;
	ret->param_hostname=NULL;
	ret->param_port=NULL;
	ret->info_callback=NULL;
	ret->nbio=0;
	ret->ip[0]=0;
	ret->ip[1]=0;
	ret->ip[2]=0;
	ret->ip[3]=0;
	ret->port=0;
	memset((char *)&ret->them,0,sizeof(ret->them));
	return(ret);
	}

void BIO_CONNECT_free(BIO_CONNECT *a)
	{
	if(a == NULL)
	    return;

	if (a->param_hostname != NULL)
		OPENSSL_free(a->param_hostname);
	if (a->param_port != NULL)
		OPENSSL_free(a->param_port);
	OPENSSL_free(a);
	}

BIO_METHOD *BIO_s_connect(void)
	{
	return(&methods_connectp);
	}

static int conn_new(BIO *bi)
	{
	bi->init=0;
	bi->num=INVALID_SOCKET;
	bi->flags=0;
	if ((bi->ptr=(char *)BIO_CONNECT_new()) == NULL)
		return(0);
	else
		return(1);
	}

static void conn_close_socket(BIO *bio)
	{
	BIO_CONNECT *c;

	c=(BIO_CONNECT *)bio->ptr;
	if (bio->num != INVALID_SOCKET)
		{
		/* Only do a shutdown if things were established */
		if (c->state == BIO_CONN_S_OK)
			shutdown(bio->num,2);
		closesocket(bio->num);
		bio->num=INVALID_SOCKET;
		}
	}

static int conn_free(BIO *a)
	{
	BIO_CONNECT *data;

	if (a == NULL) return(0);
	data=(BIO_CONNECT *)a->ptr;
	 
	if (a->shutdown)
		{
		conn_close_socket(a);
		BIO_CONNECT_free(data);
		a->ptr=NULL;
		a->flags=0;
		a->init=0;
		}
	return(1);
	}
	
static int conn_read(BIO *b, char *out, int outl)
	{
	int ret=0;
	BIO_CONNECT *data;

	data=(BIO_CONNECT *)b->ptr;
	if (data->state != BIO_CONN_S_OK)
		{
		ret=conn_state(b,data);
		if (ret <= 0)
				return(ret);
		}

	if (out != NULL)
		{
		clear_socket_error();
		ret=readsocket(b->num,out,outl);
		BIO_clear_retry_flags(b);
		if (ret <= 0)
			{
			if (BIO_sock_should_retry(ret))
				BIO_set_retry_read(b);
			}
		}
	return(ret);
	}

static int conn_write(BIO *b, const char *in, int inl)
	{
	int ret;
	BIO_CONNECT *data;

	data=(BIO_CONNECT *)b->ptr;
	if (data->state != BIO_CONN_S_OK)
		{
		ret=conn_state(b,data);
		if (ret <= 0) return(ret);
		}

	clear_socket_error();
	ret=writesocket(b->num,in,inl);
	BIO_clear_retry_flags(b);
	if (ret <= 0)
		{
		if (BIO_sock_should_retry(ret))
			BIO_set_retry_write(b);
		}
	return(ret);
	}

static long conn_ctrl(BIO *b, int cmd, long num, void *ptr)
	{
	BIO *dbio;
	int *ip;
	const char **pptr;
	long ret=1;
	BIO_CONNECT *data;

	data=(BIO_CONNECT *)b->ptr;

	switch (cmd)
		{
	case BIO_CTRL_RESET:
		ret=0;
		data->state=BIO_CONN_S_BEFORE;
		conn_close_socket(b);
		b->flags=0;
		break;
	case BIO_C_DO_STATE_MACHINE:
		/* use this one to start the connection */
		if (!(data->state != BIO_CONN_S_OK))
			ret=(long)conn_state(b,data);
		else
			ret=1;
		break;
	case BIO_C_GET_CONNECT:
		if (ptr != NULL)
			{
			pptr=(const char **)ptr;
			if (num == 0)
				{
				*pptr=data->param_hostname;

				}
			else if (num == 1)
				{
				*pptr=data->param_port;
				}
			else if (num == 2)
				{
				*pptr= (char *)&(data->ip[0]);
				}
			else if (num == 3)
				{
				*((int *)ptr)=data->port;
				}
			if ((!b->init) || (ptr == NULL))
				*pptr="not initialized";
			ret=1;
			}
		break;
	case BIO_C_SET_CONNECT:
		if (ptr != NULL)
			{
			b->init=1;
			if (num == 0)
				{
				if (data->param_hostname != NULL)
					OPENSSL_free(data->param_hostname);
				data->param_hostname=BUF_strdup(ptr);
				}
			else if (num == 1)
				{
				if (data->param_port != NULL)
					OPENSSL_free(data->param_port);
				data->param_port=BUF_strdup(ptr);
				}
			else if (num == 2)
				{
				char buf[16];
				unsigned char *p = ptr;

				BIO_snprintf(buf,sizeof buf,"%d.%d.%d.%d",
					     p[0],p[1],p[2],p[3]);
				if (data->param_hostname != NULL)
					OPENSSL_free(data->param_hostname);
				data->param_hostname=BUF_strdup(buf);
				memcpy(&(data->ip[0]),ptr,4);
				}
			else if (num == 3)
				{
				char buf[DECIMAL_SIZE(int)+1];

				BIO_snprintf(buf,sizeof buf,"%d",*(int *)ptr);
				if (data->param_port != NULL)
					OPENSSL_free(data->param_port);
				data->param_port=BUF_strdup(buf);
				data->port= *(int *)ptr;
				}
			}
		break;
	case BIO_C_SET_NBIO:
		data->nbio=(int)num;
		break;
	case BIO_C_GET_FD:
		if (b->init)
			{
			ip=(int *)ptr;
			if (ip != NULL)
				*ip=b->num;
			ret=b->num;
			}
		else
			ret= -1;
		break;
	case BIO_CTRL_GET_CLOSE:
		ret=b->shutdown;
		break;
	case BIO_CTRL_SET_CLOSE:
		b->shutdown=(int)num;
		break;
	case BIO_CTRL_PENDING:
	case BIO_CTRL_WPENDING:
		ret=0;
		break;
	case BIO_CTRL_FLUSH:
		break;
	case BIO_CTRL_DUP:
		{
		dbio=(BIO *)ptr;
		if (data->param_port)
			BIO_set_conn_port(dbio,data->param_port);
		if (data->param_hostname)
			BIO_set_conn_hostname(dbio,data->param_hostname);
		BIO_set_nbio(dbio,data->nbio);
		/* FIXME: the cast of the function seems unlikely to be a good idea */
                (void)BIO_set_info_callback(dbio,(bio_info_cb *)data->info_callback);
		}
		break;
	case BIO_CTRL_SET_CALLBACK:
		{
#if 0 /* FIXME: Should this be used?  -- Richard Levitte */
		BIOerr(BIO_F_CONN_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
		ret = -1;
#else
		ret=0;
#endif
		}
		break;
	case BIO_CTRL_GET_CALLBACK:
		{
		int (**fptr)(const BIO *bio,int state,int xret);

		fptr=(int (**)(const BIO *bio,int state,int xret))ptr;
		*fptr=data->info_callback;
		}
		break;
	default:
		ret=0;
		break;
		}
	return(ret);
	}

static long conn_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
	{
	long ret=1;
	BIO_CONNECT *data;

	data=(BIO_CONNECT *)b->ptr;

	switch (cmd)
		{
	case BIO_CTRL_SET_CALLBACK:
		{
		data->info_callback=(int (*)(const struct bio_st *, int, int))fp;
		}
		break;
	default:
		ret=0;
		break;
		}
	return(ret);
	}

static int conn_puts(BIO *bp, const char *str)
	{
	int n,ret;

	n=strlen(str);
	ret=conn_write(bp,str,n);
	return(ret);
	}

BIO *BIO_new_connect(char *str)
	{
	BIO *ret;

	ret=BIO_new(BIO_s_connect());
	if (ret == NULL) return(NULL);
	if (BIO_set_conn_hostname(ret,str))
		return(ret);
	else
		{
		BIO_free(ret);
		return(NULL);
		}
	}

#endif