/*

 * Copyright 1995-2025 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <stdio.h>

#include <errno.h>

#include "bio_local.h"

#include "internal/bio_tfo.h"

#include "internal/cryptlib.h"

#include "internal/ktls.h"

#ifndef OPENSSL_NO_SOCK

#include <openssl/bio.h>

#ifdef WATT32

/* Watt-32 uses same names */

#undef sock_write

#undef sock_read

#undef sock_puts

#define sock_write SockWrite

#define sock_read SockRead

#define sock_puts SockPuts

#endif

struct bss_sock_st {

    BIO_ADDR tfo_peer;

    int tfo_first;

#ifndef OPENSSL_NO_KTLS

    unsigned char ktls_record_type;

#endif

};

static int sock_write(BIO *h, const char *buf, int num);

static int sock_read(BIO *h, char *buf, int size);

static int sock_puts(BIO *h, const char *str);

static long sock_ctrl(BIO *h, int cmd, long arg1, void *arg2);

static int sock_new(BIO *h);

static int sock_free(BIO *data);

int BIO_sock_should_retry(int s);

static const BIO_METHOD methods_sockp = {

    BIO_TYPE_SOCKET,

    "socket",

    bwrite_conv,

    sock_write,

    bread_conv,

    sock_read,

    sock_puts,

    NULL, /* sock_gets,         */

    sock_ctrl,

    sock_new,

    sock_free,

    NULL, /* sock_callback_ctrl */

};

const BIO_METHOD *BIO_s_socket(void)

{

    return &methods_sockp;

}

BIO *BIO_new_socket(int fd, int close_flag)

{

    BIO *ret;

    ret = BIO_new(BIO_s_socket());

    if (ret == NULL)

        return NULL;

    BIO_set_fd(ret, fd, close_flag);

    return ret;

}

static int sock_new(BIO *bi)

{

    bi->init = 0;

    bi->num = 0;

    bi->flags = 0;

    bi->ptr = OPENSSL_zalloc(sizeof(struct bss_sock_st));

    if (bi->ptr == NULL)

        return 0;

    return 1;

}

static int sock_free(BIO *a)

{

    if (a == NULL)

        return 0;

    if (a->shutdown) {

        if (a->init) {

            BIO_closesocket(a->num);

        }

        a->init = 0;

        a->flags = 0;

    }

    OPENSSL_free(a->ptr);

    a->ptr = NULL;

    return 1;

}

static int sock_read(BIO *b, char *out, int outl)

{

    int ret = 0;

    if (out != NULL && outl > 0) {

        clear_socket_error();

        b->flags &= ~BIO_FLAGS_IN_EOF;

#ifndef OPENSSL_NO_KTLS

        if (BIO_get_ktls_recv(b))

            ret = ktls_read_record(b->num, out, outl);

        else

#endif

            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);

            else if (ret == 0)

                b->flags |= BIO_FLAGS_IN_EOF;

        }

    }

    return ret;

}

static int sock_write(BIO *b, const char *in, int inl)

{

    int ret = 0;

#if !defined(OPENSSL_NO_KTLS) || defined(OSSL_TFO_SENDTO)

    struct bss_sock_st *data = (struct bss_sock_st *)b->ptr;

#endif

    clear_socket_error();

#ifndef OPENSSL_NO_KTLS

    if (BIO_should_ktls_ctrl_msg_flag(b)) {

        unsigned char record_type = data->ktls_record_type;

        ret = ktls_send_ctrl_message(b->num, record_type, in, inl);

        if (ret >= 0) {

            ret = inl;

            BIO_clear_ktls_ctrl_msg_flag(b);

        }

    } else

#endif

#if defined(OSSL_TFO_SENDTO)

        if (data->tfo_first) {

        struct bss_sock_st *data = (struct bss_sock_st *)b->ptr;

        socklen_t peerlen = BIO_ADDR_sockaddr_size(&data->tfo_peer);

        ret = sendto(b->num, in, inl, OSSL_TFO_SENDTO,

            BIO_ADDR_sockaddr(&data->tfo_peer), peerlen);

        data->tfo_first = 0;

    } else

#endif

        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 sock_ctrl(BIO *b, int cmd, long num, void *ptr)

{

    long ret = 1;

    int *ip;

    struct bss_sock_st *data = (struct bss_sock_st *)b->ptr;

#ifndef OPENSSL_NO_KTLS

    ktls_crypto_info_t *crypto_info;

#endif

    switch (cmd) {

    case BIO_C_SET_FD:

        /* minimal sock_free() */

        if (b->shutdown) {

            if (b->init)

                BIO_closesocket(b->num);

            b->flags = 0;

        }

        b->num = *((int *)ptr);

        b->shutdown = (int)num;

        b->init = 1;

        data->tfo_first = 0;

        memset(&data->tfo_peer, 0, sizeof(data->tfo_peer));

        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_DUP:

    case BIO_CTRL_FLUSH:

        ret = 1;

        break;

    case BIO_CTRL_GET_RPOLL_DESCRIPTOR:

    case BIO_CTRL_GET_WPOLL_DESCRIPTOR: {

        BIO_POLL_DESCRIPTOR *pd = ptr;

        if (!b->init) {

            ret = 0;

            break;

        }

        pd->type = BIO_POLL_DESCRIPTOR_TYPE_SOCK_FD;

        pd->value.fd = b->num;

    } break;

#ifndef OPENSSL_NO_KTLS

    case BIO_CTRL_SET_KTLS:

        crypto_info = (ktls_crypto_info_t *)ptr;

        ret = ktls_start(b->num, crypto_info, num);

        if (ret)

            BIO_set_ktls_flag(b, num);

        break;

    case BIO_CTRL_GET_KTLS_SEND:

        return BIO_should_ktls_flag(b, 1) != 0;

    case BIO_CTRL_GET_KTLS_RECV:

        return BIO_should_ktls_flag(b, 0) != 0;

    case BIO_CTRL_SET_KTLS_TX_SEND_CTRL_MSG:

        BIO_set_ktls_ctrl_msg_flag(b);

        data->ktls_record_type = (unsigned char)num;

        ret = 0;

        break;

    case BIO_CTRL_CLEAR_KTLS_TX_CTRL_MSG:

        BIO_clear_ktls_ctrl_msg_flag(b);

        ret = 0;

        break;

    case BIO_CTRL_SET_KTLS_TX_ZEROCOPY_SENDFILE:

        ret = ktls_enable_tx_zerocopy_sendfile(b->num);

        if (ret)

            BIO_set_ktls_zerocopy_sendfile_flag(b);

        break;

#endif

    case BIO_CTRL_EOF:

        ret = (b->flags & BIO_FLAGS_IN_EOF) != 0;

        break;

    case BIO_C_GET_CONNECT:

        if (ptr != NULL && num == 2) {

            const char **pptr = (const char **)ptr;

            *pptr = (const char *)&data->tfo_peer;

        } else {

            ret = 0;

        }

        break;

    case BIO_C_SET_CONNECT:

        if (ptr != NULL && num == 2) {

            ret = BIO_ADDR_make(&data->tfo_peer,

                BIO_ADDR_sockaddr((const BIO_ADDR *)ptr));

            if (ret)

                data->tfo_first = 1;

        } else {

            ret = 0;

        }

        break;

    default:

        ret = 0;

        break;

    }

    return ret;

}

static int sock_puts(BIO *bp, const char *str)

{

    int ret;

    size_t n = strlen(str);

    if (n > INT_MAX)

        return -1;

    ret = sock_write(bp, str, (int)n);

    return ret;

}

int BIO_sock_should_retry(int i)

{

    int err;

    if ((i == 0) || (i == -1)) {

        err = get_last_socket_error();

        return BIO_sock_non_fatal_error(err);

    }

    return 0;

}

int BIO_sock_non_fatal_error(int err)

{

#if defined(OPENSSL_SYS_WINDOWS)

    return err == WSAEWOULDBLOCK

        || err == WSAENOTCONN

        || err == WSAEINTR

        || err == WSAEINPROGRESS

        || err == WSAEALREADY;

#else /* POSIX.1-2001 */

    return err == EWOULDBLOCK

        || err == EAGAIN

        || err == ENOTCONN

        || err == EINTR

#if !defined(__DJGPP__) && !defined(OPENSSL_SYS_TANDEM)

        || err == EPROTO

#endif

#ifdef __FreeBSD__

        || err == EBUSY

#endif

        || err == EINPROGRESS

        || err == EALREADY;

#endif

}

#endif /* #ifndef OPENSSL_NO_SOCK */