openssl/crypto/bio/bss_acpt.c

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

#ifndef OPENSSL_NO_SOCK

# 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_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 BIO_METHOD methods_acceptp = {
    BIO_TYPE_ACCEPT,
    "socket accept",
    acpt_write,
    acpt_read,
    acpt_puts,
    NULL,                       /* connect_gets, */
    acpt_ctrl,
    acpt_new,
    acpt_free,
    NULL,
};

BIO_METHOD *BIO_s_accept(void)
{
    return (&methods_acceptp);
}

static int acpt_new(BIO *bi)
{
    BIO_ACCEPT *ba;

    bi->init = 0;
    bi->num = (int)INVALID_SOCKET;
    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 = OPENSSL_zalloc(sizeof(*ret))) == NULL)
        return (NULL);
    ret->accept_sock = (int)INVALID_SOCKET;
    ret->bind_mode = BIO_BIND_NORMAL;
    return (ret);
}

static void BIO_ACCEPT_free(BIO_ACCEPT *a)
{
    if (a == NULL)
        return;

    OPENSSL_free(a->param_addr);
    OPENSSL_free(a->addr);
    BIO_free(a->bio_chain);
    OPENSSL_free(a);
}

static void acpt_close_socket(BIO *bio)
{
    BIO_ACCEPT *c;

    c = (BIO_ACCEPT *)bio->ptr;
    if (c->accept_sock != (int)INVALID_SOCKET) {
        shutdown(c->accept_sock, 2);
        closesocket(c->accept_sock);
        c->accept_sock = (int)INVALID_SOCKET;
        bio->num = (int)INVALID_SOCKET;
    }
}

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) {
            BIOerr(BIO_F_ACPT_STATE, BIO_R_NO_ACCEPT_PORT_SPECIFIED);
            return (-1);
        }
        s = BIO_get_accept_socket(c->param_addr, c->bind_mode);
        if (s == (int)INVALID_SOCKET)
            return (-1);

        if (c->accept_nbio) {
            if (!BIO_socket_nbio(s, 1)) {
                closesocket(s);
                BIOerr(BIO_F_ACPT_STATE,
                       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)) {
                BIOerr(BIO_F_ACPT_STATE,
                       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);
        else if (s >= 0)
            closesocket(s);
        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;
                OPENSSL_free(data->param_addr);
                data->param_addr = OPENSSL_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(const char *str)
{
    BIO *ret;

    ret = BIO_new(BIO_s_accept());
    if (ret == NULL)
        return (NULL);
    if (BIO_set_accept_port(ret, str))
        return (ret);
    BIO_free(ret);
    return (NULL);
}

#endif