IABSD.fr/src/lib/libcrypto/bio/bss_conn.c

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• Author : tb
  Date : 2018-05-12 18:51:59
  Hash : 91427bf7
  Message : const qualifiers for BIO_new_mem_buf(), BIO_new_connect() and BIO_new_accept(). The one for BIO_new_mem_buf() is a bit ugly since it needs to cast away the newly added const qualifier, as in OpenSSL commit 8ab31975bac. ok jsing

• lib/libcrypto/bio/bss_conn.c

• /* $OpenBSD: bss_conn.c,v 1.35 2018/05/12 18:51:59 tb Exp $ */
  /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * 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 (tjh@cryptsoft.com).
   * 
   * 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 (eay@cryptsoft.com)"
   *    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 (tjh@cryptsoft.com)"
   * 
   * 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 <sys/socket.h>
  
  #include <netinet/in.h>
  
  #include <errno.h>
  #include <netdb.h>
  #include <stdio.h>
  #include <string.h>
  #include <unistd.h>
  
  #include <openssl/bio.h>
  #include <openssl/buffer.h>
  #include <openssl/err.h>
  
  #define SOCKET_PROTOCOL IPPROTO_TCP
  
  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 const BIO_METHOD methods_connectp = {
  	.type = BIO_TYPE_CONNECT,
  	.name = "socket connect",
  	.bwrite = conn_write,
  	.bread = conn_read,
  	.bputs = conn_puts,
  	.ctrl = conn_ctrl,
  	.create = conn_new,
  	.destroy = conn_free,
  	.callback_ctrl = 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) {
  				BIOerror(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;
  						}
  					free(c->param_port);
  					c->param_port = strdup(p);
  				}
  			}
  
  			if (c->param_port == NULL) {
  				BIOerror(BIO_R_NO_PORT_SPECIFIED);
  				ERR_asprintf_error_data("host=%s",
  				    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 == -1) {
  				SYSerror(errno);
  				ERR_asprintf_error_data("host=%s:%s",
  				    c->param_hostname, c->param_port);
  				BIOerror(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)) {
  					BIOerror(BIO_R_ERROR_SETTING_NBIO);
  					ERR_asprintf_error_data("host=%s:%s",
  					    c->param_hostname, c->param_port);
  					goto exit_loop;
  				}
  			}
  			c->state = BIO_CONN_S_CONNECT;
  
  #if defined(SO_KEEPALIVE)
  			i = 1;
  			i = setsockopt(b->num, SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i));
  			if (i < 0) {
  				SYSerror(errno);
  				ERR_asprintf_error_data("host=%s:%s",
  				    c->param_hostname, c->param_port);
  				BIOerror(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 {
  					SYSerror(errno);
  					ERR_asprintf_error_data("host=%s:%s",
  					    c->param_hostname, c->param_port);
  					BIOerror(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);
  				SYSerror(i);
  				ERR_asprintf_error_data("host=%s:%s",
  				    c->param_hostname, c->param_port);
  				BIOerror(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 = 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;
  
  	free(a->param_hostname);
  	free(a->param_port);
  	free(a);
  }
  
  const BIO_METHOD *
  BIO_s_connect(void)
  {
  	return (&methods_connectp);
  }
  
  static int
  conn_new(BIO *bi)
  {
  	bi->init = 0;
  	bi->num = -1;
  	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 != -1) {
  		/* Only do a shutdown if things were established */
  		if (c->state == BIO_CONN_S_OK)
  			shutdown(bio->num, SHUT_RDWR);
  		close(bio->num);
  		bio->num = -1;
  	}
  }
  
  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) {
  		errno = 0;
  		ret = read(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);
  	}
  
  	errno = 0;
  	ret = write(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) {
  				free(data->param_hostname);
  				data->param_hostname = strdup(ptr);
  			} else if (num == 1) {
  				free(data->param_port);
  				data->param_port = strdup(ptr);
  			} else if (num == 2) {
  				unsigned char *p = ptr;
  				free(data->param_hostname);
  				if (asprintf(&data->param_hostname,
  					"%u.%u.%u.%u", p[0], p[1],
  					p[2], p[3]) == -1)
  					data->param_hostname = NULL;
  				memcpy(&(data->ip[0]), ptr, 4);
  			} else if (num == 3) {
  				free(data->param_port);
  				data->port= *(int *)ptr;
  				if (asprintf(&data->param_port, "%d",
  					data->port) == -1)
  					data->param_port = NULL;
  			}
  		}
  		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 */
  			BIOerror(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(const 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);
  	}
  }