/* crypto/bio/bss_conn.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 "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 = NULL;

    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 (b->init) {

            if (pptr != NULL) {

                ret = 1;

                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 {

                    ret = 0;

                }

            }

            if (num == 3) {

                ret = data->port;

            }

        } else {

            if (pptr != NULL)

                *pptr = "not initialized";

            ret = 0;

        }

        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(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);

    }

}

#endif