/* $OpenBSD: bss_conn.c,v 1.43 2025/06/02 12:18:21 jsg 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 "bio_local.h"
#include "err_local.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 */
        BIO_info_cb *info_callback;
} 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);
static BIO_CONNECT *BIO_CONNECT_new(void);
static 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;
        BIO_info_cb *cb = 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);
}

static 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);
}

static 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);
}
LCRYPTO_ALIAS(BIO_s_connect);

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);
                        (void)BIO_set_info_callback(dbio, 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:
                {
                        BIO_info_cb **fptr = 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 = (BIO_info_cb *)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);
        }
}
LCRYPTO_ALIAS(BIO_new_connect);