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|
/* $OpenBSD: bss_acpt.c,v 1.28 2018/05/01 13:29:09 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 <errno.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_accept_st {
int state;
char *param_addr;
int accept_sock;
int accept_nbio;
char *addr;
int nbio;
/* If 0, it means normal, if 1, do a connect on bind failure,
* and if there is no-one listening, bind with SO_REUSEADDR.
* If 2, always use SO_REUSEADDR. */
int bind_mode;
BIO *bio_chain;
} BIO_ACCEPT;
static int acpt_write(BIO *h, const char *buf, int num);
static int acpt_read(BIO *h, char *buf, int size);
static int acpt_puts(BIO *h, const char *str);
static long acpt_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int acpt_new(BIO *h);
static int acpt_free(BIO *data);
static int acpt_state(BIO *b, BIO_ACCEPT *c);
static void acpt_close_socket(BIO *data);
static BIO_ACCEPT *BIO_ACCEPT_new(void );
static void BIO_ACCEPT_free(BIO_ACCEPT *a);
#define ACPT_S_BEFORE 1
#define ACPT_S_GET_ACCEPT_SOCKET 2
#define ACPT_S_OK 3
static const BIO_METHOD methods_acceptp = {
.type = BIO_TYPE_ACCEPT,
.name = "socket accept",
.bwrite = acpt_write,
.bread = acpt_read,
.bputs = acpt_puts,
.ctrl = acpt_ctrl,
.create = acpt_new,
.destroy = acpt_free
};
const BIO_METHOD *
BIO_s_accept(void)
{
return (&methods_acceptp);
}
static int
acpt_new(BIO *bi)
{
BIO_ACCEPT *ba;
bi->init = 0;
bi->num = -1;
bi->flags = 0;
if ((ba = BIO_ACCEPT_new()) == NULL)
return (0);
bi->ptr = (char *)ba;
ba->state = ACPT_S_BEFORE;
bi->shutdown = 1;
return (1);
}
static BIO_ACCEPT *
BIO_ACCEPT_new(void)
{
BIO_ACCEPT *ret;
if ((ret = calloc(1, sizeof(BIO_ACCEPT))) == NULL)
return (NULL);
ret->accept_sock = -1;
ret->bind_mode = BIO_BIND_NORMAL;
return (ret);
}
static void
BIO_ACCEPT_free(BIO_ACCEPT *a)
{
if (a == NULL)
return;
free(a->param_addr);
free(a->addr);
BIO_free(a->bio_chain);
free(a);
}
static void
acpt_close_socket(BIO *bio)
{
BIO_ACCEPT *c;
c = (BIO_ACCEPT *)bio->ptr;
if (c->accept_sock != -1) {
shutdown(c->accept_sock, SHUT_RDWR);
close(c->accept_sock);
c->accept_sock = -1;
bio->num = -1;
}
}
static int
acpt_free(BIO *a)
{
BIO_ACCEPT *data;
if (a == NULL)
return (0);
data = (BIO_ACCEPT *)a->ptr;
if (a->shutdown) {
acpt_close_socket(a);
BIO_ACCEPT_free(data);
a->ptr = NULL;
a->flags = 0;
a->init = 0;
}
return (1);
}
static int
acpt_state(BIO *b, BIO_ACCEPT *c)
{
BIO *bio = NULL, *dbio;
int s = -1;
int i;
again:
switch (c->state) {
case ACPT_S_BEFORE:
if (c->param_addr == NULL) {
BIOerror(BIO_R_NO_ACCEPT_PORT_SPECIFIED);
return (-1);
}
s = BIO_get_accept_socket(c->param_addr, c->bind_mode);
if (s == -1)
return (-1);
if (c->accept_nbio) {
if (!BIO_socket_nbio(s, 1)) {
close(s);
BIOerror(BIO_R_ERROR_SETTING_NBIO_ON_ACCEPT_SOCKET);
return (-1);
}
}
c->accept_sock = s;
b->num = s;
c->state = ACPT_S_GET_ACCEPT_SOCKET;
return (1);
/* break; */
case ACPT_S_GET_ACCEPT_SOCKET:
if (b->next_bio != NULL) {
c->state = ACPT_S_OK;
goto again;
}
BIO_clear_retry_flags(b);
b->retry_reason = 0;
i = BIO_accept(c->accept_sock, &(c->addr));
/* -2 return means we should retry */
if (i == -2) {
BIO_set_retry_special(b);
b->retry_reason = BIO_RR_ACCEPT;
return -1;
}
if (i < 0)
return (i);
bio = BIO_new_socket(i, BIO_CLOSE);
if (bio == NULL)
goto err;
BIO_set_callback(bio, BIO_get_callback(b));
BIO_set_callback_arg(bio, BIO_get_callback_arg(b));
if (c->nbio) {
if (!BIO_socket_nbio(i, 1)) {
BIOerror(BIO_R_ERROR_SETTING_NBIO_ON_ACCEPTED_SOCKET);
goto err;
}
}
/* If the accept BIO has an bio_chain, we dup it and
* put the new socket at the end. */
if (c->bio_chain != NULL) {
if ((dbio = BIO_dup_chain(c->bio_chain)) == NULL)
goto err;
if (!BIO_push(dbio, bio)) goto err;
bio = dbio;
}
if (BIO_push(b, bio)
== NULL) goto err;
c->state = ACPT_S_OK;
return (1);
err:
if (bio != NULL)
BIO_free(bio);
return (0);
/* break; */
case ACPT_S_OK:
if (b->next_bio == NULL) {
c->state = ACPT_S_GET_ACCEPT_SOCKET;
goto again;
}
return (1);
/* break; */
default:
return (0);
/* break; */
}
}
static int
acpt_read(BIO *b, char *out, int outl)
{
int ret = 0;
BIO_ACCEPT *data;
BIO_clear_retry_flags(b);
data = (BIO_ACCEPT *)b->ptr;
while (b->next_bio == NULL) {
ret = acpt_state(b, data);
if (ret <= 0)
return (ret);
}
ret = BIO_read(b->next_bio, out, outl);
BIO_copy_next_retry(b);
return (ret);
}
static int
acpt_write(BIO *b, const char *in, int inl)
{
int ret;
BIO_ACCEPT *data;
BIO_clear_retry_flags(b);
data = (BIO_ACCEPT *)b->ptr;
while (b->next_bio == NULL) {
ret = acpt_state(b, data);
if (ret <= 0)
return (ret);
}
ret = BIO_write(b->next_bio, in, inl);
BIO_copy_next_retry(b);
return (ret);
}
static long
acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
{
int *ip;
long ret = 1;
BIO_ACCEPT *data;
char **pp;
data = (BIO_ACCEPT *)b->ptr;
switch (cmd) {
case BIO_CTRL_RESET:
ret = 0;
data->state = ACPT_S_BEFORE;
acpt_close_socket(b);
b->flags = 0;
break;
case BIO_C_DO_STATE_MACHINE:
/* use this one to start the connection */
ret = (long)acpt_state(b, data);
break;
case BIO_C_SET_ACCEPT:
if (ptr != NULL) {
if (num == 0) {
b->init = 1;
free(data->param_addr);
data->param_addr = strdup(ptr);
} else if (num == 1) {
data->accept_nbio = (ptr != NULL);
} else if (num == 2) {
BIO_free(data->bio_chain);
data->bio_chain = (BIO *)ptr;
}
}
break;
case BIO_C_SET_NBIO:
data->nbio = (int)num;
break;
case BIO_C_SET_FD:
b->init = 1;
b->num= *((int *)ptr);
data->accept_sock = b->num;
data->state = ACPT_S_GET_ACCEPT_SOCKET;
b->shutdown = (int)num;
b->init = 1;
break;
case BIO_C_GET_FD:
if (b->init) {
ip = (int *)ptr;
if (ip != NULL)
*ip = data->accept_sock;
ret = data->accept_sock;
} else
ret = -1;
break;
case BIO_C_GET_ACCEPT:
if (b->init) {
if (ptr != NULL) {
pp = (char **)ptr;
*pp = data->param_addr;
} else
ret = -1;
} 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_C_SET_BIND_MODE:
data->bind_mode = (int)num;
break;
case BIO_C_GET_BIND_MODE:
ret = (long)data->bind_mode;
break;
case BIO_CTRL_DUP:
/* dbio=(BIO *)ptr;
if (data->param_port) EAY EAY
BIO_set_port(dbio,data->param_port);
if (data->param_hostname)
BIO_set_hostname(dbio,data->param_hostname);
BIO_set_nbio(dbio,data->nbio);
*/
break;
default:
ret = 0;
break;
}
return (ret);
}
static int
acpt_puts(BIO *bp, const char *str)
{
int n, ret;
n = strlen(str);
ret = acpt_write(bp, str, n);
return (ret);
}
BIO *
BIO_new_accept(char *str)
{
BIO *ret;
ret = BIO_new(BIO_s_accept());
if (ret == NULL)
return (NULL);
if (BIO_set_accept_port(ret, str))
return (ret);
else {
BIO_free(ret);
return (NULL);
}
}
|