openssl/crypto/bio/b_sock.c

/* crypto/bio/b_sock.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 <stdlib.h>
#include <errno.h>
#define USE_SOCKETS
#include "cryptlib.h"
#include <openssl/bio.h>
#if defined(OPENSSL_SYS_NETWARE) && defined(NETWARE_BSDSOCK)
# include <netdb.h>
# if defined(NETWARE_CLIB)
#  include <sys/ioctl.h>
NETDB_DEFINE_CONTEXT
# endif
#endif
#ifndef OPENSSL_NO_SOCK
# ifdef OPENSSL_SYS_WIN16
#  define SOCKET_PROTOCOL 0     /* more microsoft stupidity */
# else
#  define SOCKET_PROTOCOL IPPROTO_TCP
# endif
# ifdef SO_MAXCONN
#  define MAX_LISTEN  SO_MAXCONN
# elif defined(SOMAXCONN)
#  define MAX_LISTEN  SOMAXCONN
# else
#  define MAX_LISTEN  32
# endif
# if defined(OPENSSL_SYS_WINDOWS) || (defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK))
static int wsa_init_done = 0;
# endif

# if 0
static unsigned long BIO_ghbn_hits = 0L;
static unsigned long BIO_ghbn_miss = 0L;

#  define GHBN_NUM        4
static struct ghbn_cache_st {
    char name[129];
    struct hostent *ent;
    unsigned long order;
} ghbn_cache[GHBN_NUM];
# endif

static int get_ip(const char *str, unsigned char *ip);
# if 0
static void ghbn_free(struct hostent *a);
static struct hostent *ghbn_dup(struct hostent *a);
# endif
int BIO_get_host_ip(const char *str, unsigned char *ip)
{
    int i;
    int err = 1;
    int locked = 0;
    struct hostent *he;

    i = get_ip(str, ip);
    if (i < 0) {
        BIOerr(BIO_F_BIO_GET_HOST_IP, BIO_R_INVALID_IP_ADDRESS);
        goto err;
    }

    /*
     * At this point, we have something that is most probably correct in some
     * way, so let's init the socket.
     */
    if (BIO_sock_init() != 1)
        return 0;               /* don't generate another error code here */

    /*
     * If the string actually contained an IP address, we need not do
     * anything more
     */
    if (i > 0)
        return (1);

    /* do a gethostbyname */
    CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
    locked = 1;
    he = BIO_gethostbyname(str);
    if (he == NULL) {
        BIOerr(BIO_F_BIO_GET_HOST_IP, BIO_R_BAD_HOSTNAME_LOOKUP);
        goto err;
    }

    /* cast to short because of win16 winsock definition */
    if ((short)he->h_addrtype != AF_INET) {
        BIOerr(BIO_F_BIO_GET_HOST_IP,
               BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET);
        goto err;
    }
    for (i = 0; i < 4; i++)
        ip[i] = he->h_addr_list[0][i];
    err = 0;

 err:
    if (locked)
        CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
    if (err) {
        ERR_add_error_data(2, "host=", str);
        return 0;
    } else
        return 1;
}

int BIO_get_port(const char *str, unsigned short *port_ptr)
{
    int i;
    struct servent *s;

    if (str == NULL) {
        BIOerr(BIO_F_BIO_GET_PORT, BIO_R_NO_PORT_DEFINED);
        return (0);
    }
    i = atoi(str);
    if (i != 0)
        *port_ptr = (unsigned short)i;
    else {
        CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME);
        /*
         * Note: under VMS with SOCKETSHR, it seems like the first parameter
         * is 'char *', instead of 'const char *'
         */
# ifndef CONST_STRICT
        s = getservbyname((char *)str, "tcp");
# else
        s = getservbyname(str, "tcp");
# endif
        if (s != NULL)
            *port_ptr = ntohs((unsigned short)s->s_port);
        CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME);
        if (s == NULL) {
            if (strcmp(str, "http") == 0)
                *port_ptr = 80;
            else if (strcmp(str, "telnet") == 0)
                *port_ptr = 23;
            else if (strcmp(str, "socks") == 0)
                *port_ptr = 1080;
            else if (strcmp(str, "https") == 0)
                *port_ptr = 443;
            else if (strcmp(str, "ssl") == 0)
                *port_ptr = 443;
            else if (strcmp(str, "ftp") == 0)
                *port_ptr = 21;
            else if (strcmp(str, "gopher") == 0)
                *port_ptr = 70;
# if 0
            else if (strcmp(str, "wais") == 0)
                *port_ptr = 21;
# endif
            else {
                SYSerr(SYS_F_GETSERVBYNAME, get_last_socket_error());
                ERR_add_error_data(3, "service='", str, "'");
                return (0);
            }
        }
    }
    return (1);
}

int BIO_sock_error(int sock)
{
    int j, i;
    int size;

    size = sizeof(int);
    /*
     * Note: under Windows the third parameter is of type (char *) whereas
     * under other systems it is (void *) if you don't have a cast it will
     * choke the compiler: if you do have a cast then you can either go for
     * (char *) or (void *).
     */
    i = getsockopt(sock, SOL_SOCKET, SO_ERROR, (void *)&j, (void *)&size);
    if (i < 0)
        return (1);
    else
        return (j);
}

# if 0
long BIO_ghbn_ctrl(int cmd, int iarg, char *parg)
{
    int i;
    char **p;

    switch (cmd) {
    case BIO_GHBN_CTRL_HITS:
        return (BIO_ghbn_hits);
        /* break; */
    case BIO_GHBN_CTRL_MISSES:
        return (BIO_ghbn_miss);
        /* break; */
    case BIO_GHBN_CTRL_CACHE_SIZE:
        return (GHBN_NUM);
        /* break; */
    case BIO_GHBN_CTRL_GET_ENTRY:
        if ((iarg >= 0) && (iarg < GHBN_NUM) && (ghbn_cache[iarg].order > 0)) {
            p = (char **)parg;
            if (p == NULL)
                return (0);
            *p = ghbn_cache[iarg].name;
            ghbn_cache[iarg].name[128] = '\0';
            return (1);
        }
        return (0);
        /* break; */
    case BIO_GHBN_CTRL_FLUSH:
        for (i = 0; i < GHBN_NUM; i++)
            ghbn_cache[i].order = 0;
        break;
    default:
        return (0);
    }
    return (1);
}
# endif

# if 0
static struct hostent *ghbn_dup(struct hostent *a)
{
    struct hostent *ret;
    int i, j;

    MemCheck_off();
    ret = (struct hostent *)OPENSSL_malloc(sizeof(struct hostent));
    if (ret == NULL)
        return (NULL);
    memset(ret, 0, sizeof(struct hostent));

    for (i = 0; a->h_aliases[i] != NULL; i++) ;
    i++;
    ret->h_aliases = (char **)OPENSSL_malloc(i * sizeof(char *));
    if (ret->h_aliases == NULL)
        goto err;
    memset(ret->h_aliases, 0, i * sizeof(char *));

    for (i = 0; a->h_addr_list[i] != NULL; i++) ;
    i++;
    ret->h_addr_list = (char **)OPENSSL_malloc(i * sizeof(char *));
    if (ret->h_addr_list == NULL)
        goto err;
    memset(ret->h_addr_list, 0, i * sizeof(char *));

    j = strlen(a->h_name) + 1;
    if ((ret->h_name = OPENSSL_malloc(j)) == NULL)
        goto err;
    memcpy((char *)ret->h_name, a->h_name, j);
    for (i = 0; a->h_aliases[i] != NULL; i++) {
        j = strlen(a->h_aliases[i]) + 1;
        if ((ret->h_aliases[i] = OPENSSL_malloc(j)) == NULL)
            goto err;
        memcpy(ret->h_aliases[i], a->h_aliases[i], j);
    }
    ret->h_length = a->h_length;
    ret->h_addrtype = a->h_addrtype;
    for (i = 0; a->h_addr_list[i] != NULL; i++) {
        if ((ret->h_addr_list[i] = OPENSSL_malloc(a->h_length)) == NULL)
            goto err;
        memcpy(ret->h_addr_list[i], a->h_addr_list[i], a->h_length);
    }
    if (0) {
 err:
        if (ret != NULL)
            ghbn_free(ret);
        ret = NULL;
    }
    MemCheck_on();
    return (ret);
}

static void ghbn_free(struct hostent *a)
{
    int i;

    if (a == NULL)
        return;

    if (a->h_aliases != NULL) {
        for (i = 0; a->h_aliases[i] != NULL; i++)
            OPENSSL_free(a->h_aliases[i]);
        OPENSSL_free(a->h_aliases);
    }
    if (a->h_addr_list != NULL) {
        for (i = 0; a->h_addr_list[i] != NULL; i++)
            OPENSSL_free(a->h_addr_list[i]);
        OPENSSL_free(a->h_addr_list);
    }
    if (a->h_name != NULL)
        OPENSSL_free(a->h_name);
    OPENSSL_free(a);
}

# endif

struct hostent *BIO_gethostbyname(const char *name)
{
# if 1
    /*
     * Caching gethostbyname() results forever is wrong, so we have to let
     * the true gethostbyname() worry about this
     */
#  if (defined(NETWARE_BSDSOCK) && !defined(__NOVELL_LIBC__))
    return gethostbyname((char *)name);
#  else
    return gethostbyname(name);
#  endif
# else
    struct hostent *ret;
    int i, lowi = 0, j;
    unsigned long low = (unsigned long)-1;

#  if 0
    /*
     * It doesn't make sense to use locking here: The function interface is
     * not thread-safe, because threads can never be sure when some other
     * thread destroys the data they were given a pointer to.
     */
    CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME);
#  endif
    j = strlen(name);
    if (j < 128) {
        for (i = 0; i < GHBN_NUM; i++) {
            if (low > ghbn_cache[i].order) {
                low = ghbn_cache[i].order;
                lowi = i;
            }
            if (ghbn_cache[i].order > 0) {
                if (strncmp(name, ghbn_cache[i].name, 128) == 0)
                    break;
            }
        }
    } else
        i = GHBN_NUM;

    if (i == GHBN_NUM) {        /* no hit */
        BIO_ghbn_miss++;
        /*
         * Note: under VMS with SOCKETSHR, it seems like the first parameter
         * is 'char *', instead of 'const char *'
         */
#  ifndef CONST_STRICT
        ret = gethostbyname((char *)name);
#  else
        ret = gethostbyname(name);
#  endif

        if (ret == NULL)
            goto end;
        if (j > 128) {          /* too big to cache */
#  if 0
            /*
             * If we were trying to make this function thread-safe (which is
             * bound to fail), we'd have to give up in this case (or allocate
             * more memory).
             */
            ret = NULL;
#  endif
            goto end;
        }

        /* else add to cache */
        if (ghbn_cache[lowi].ent != NULL)
            ghbn_free(ghbn_cache[lowi].ent); /* XXX not thread-safe */
        ghbn_cache[lowi].name[0] = '\0';

        if ((ret = ghbn_cache[lowi].ent = ghbn_dup(ret)) == NULL) {
            BIOerr(BIO_F_BIO_GETHOSTBYNAME, ERR_R_MALLOC_FAILURE);
            goto end;
        }
        strncpy(ghbn_cache[lowi].name, name, 128);
        ghbn_cache[lowi].order = BIO_ghbn_miss + BIO_ghbn_hits;
    } else {
        BIO_ghbn_hits++;
        ret = ghbn_cache[i].ent;
        ghbn_cache[i].order = BIO_ghbn_miss + BIO_ghbn_hits;
    }
 end:
#  if 0
    CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME);
#  endif
    return (ret);
# endif
}

int BIO_sock_init(void)
{
# ifdef OPENSSL_SYS_WINDOWS
    static struct WSAData wsa_state;

    if (!wsa_init_done) {
        int err;

        wsa_init_done = 1;
        memset(&wsa_state, 0, sizeof(wsa_state));
        if (WSAStartup(0x0101, &wsa_state) != 0) {
            err = WSAGetLastError();
            SYSerr(SYS_F_WSASTARTUP, err);
            BIOerr(BIO_F_BIO_SOCK_INIT, BIO_R_WSASTARTUP);
            return (-1);
        }
    }
# endif                         /* OPENSSL_SYS_WINDOWS */
# ifdef WATT32
    extern int _watt_do_exit;
    _watt_do_exit = 0;          /* don't make sock_init() call exit() */
    if (sock_init())
        return (-1);
# endif

# if defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
    WORD wVerReq;
    WSADATA wsaData;
    int err;

    if (!wsa_init_done) {
        wsa_init_done = 1;
        wVerReq = MAKEWORD(2, 0);
        err = WSAStartup(wVerReq, &wsaData);
        if (err != 0) {
            SYSerr(SYS_F_WSASTARTUP, err);
            BIOerr(BIO_F_BIO_SOCK_INIT, BIO_R_WSASTARTUP);
            return (-1);
        }
    }
# endif

    return (1);
}

void BIO_sock_cleanup(void)
{
# ifdef OPENSSL_SYS_WINDOWS
    if (wsa_init_done) {
        wsa_init_done = 0;
#  ifndef OPENSSL_SYS_WINCE
        WSACancelBlockingCall(); /* Winsock 1.1 specific */
#  endif
        WSACleanup();
    }
# elif defined(OPENSSL_SYS_NETWARE) && !defined(NETWARE_BSDSOCK)
    if (wsa_init_done) {
        wsa_init_done = 0;
        WSACleanup();
    }
# endif
}

# if !defined(OPENSSL_SYS_VMS) || __VMS_VER >= 70000000

int BIO_socket_ioctl(int fd, long type, void *arg)
{
    int i;

#  ifdef __DJGPP__
    i = ioctlsocket(fd, type, (char *)arg);
#  else
    i = ioctlsocket(fd, type, arg);
#  endif                        /* __DJGPP__ */
    if (i < 0)
        SYSerr(SYS_F_IOCTLSOCKET, get_last_socket_error());
    return (i);
}
# endif                         /* __VMS_VER */

/*
 * The reason I have implemented this instead of using sscanf is because
 * Visual C 1.52c gives an unresolved external when linking a DLL :-(
 */
static int get_ip(const char *str, unsigned char ip[4])
{
    unsigned int tmp[4];
    int num = 0, c, ok = 0;

    tmp[0] = tmp[1] = tmp[2] = tmp[3] = 0;

    for (;;) {
        c = *(str++);
        if ((c >= '0') && (c <= '9')) {
            ok = 1;
            tmp[num] = tmp[num] * 10 + c - '0';
            if (tmp[num] > 255)
                return (0);
        } else if (c == '.') {
            if (!ok)
                return (-1);
            if (num == 3)
                return (0);
            num++;
            ok = 0;
        } else if (c == '\0' && (num == 3) && ok)
            break;
        else
            return (0);
    }
    ip[0] = tmp[0];
    ip[1] = tmp[1];
    ip[2] = tmp[2];
    ip[3] = tmp[3];
    return (1);
}

int BIO_get_accept_socket(char *host, int bind_mode)
{
    int ret = 0;
    struct sockaddr_in server, client;
    int s = INVALID_SOCKET, cs;
    unsigned char ip[4];
    unsigned short port;
    char *str = NULL, *e;
    const char *h, *p;
    unsigned long l;
    int err_num;

    if (BIO_sock_init() != 1)
        return (INVALID_SOCKET);

    if ((str = BUF_strdup(host)) == NULL)
        return (INVALID_SOCKET);

    h = p = NULL;
    h = str;
    for (e = str; *e; e++) {
        if (*e == ':') {
            p = &(e[1]);
            *e = '\0';
        } else if (*e == '/') {
            *e = '\0';
            break;
        }
    }

    if (p == NULL) {
        p = h;
        h = "*";
    }

    if (!BIO_get_port(p, &port))
        goto err;

    memset((char *)&server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(port);

    if (strcmp(h, "*") == 0)
        server.sin_addr.s_addr = INADDR_ANY;
    else {
        if (!BIO_get_host_ip(h, &(ip[0])))
            goto err;
        l = (unsigned long)
            ((unsigned long)ip[0] << 24L) |
            ((unsigned long)ip[1] << 16L) |
            ((unsigned long)ip[2] << 8L) | ((unsigned long)ip[3]);
        server.sin_addr.s_addr = htonl(l);
    }

 again:
    s = socket(AF_INET, SOCK_STREAM, SOCKET_PROTOCOL);
    if (s == INVALID_SOCKET) {
        SYSerr(SYS_F_SOCKET, get_last_socket_error());
        ERR_add_error_data(3, "port='", host, "'");
        BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_CREATE_SOCKET);
        goto err;
    }
# ifdef SO_REUSEADDR
    if (bind_mode == BIO_BIND_REUSEADDR) {
        int i = 1;

        ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&i, sizeof(i));
        bind_mode = BIO_BIND_NORMAL;
    }
# endif
    if (bind(s, (struct sockaddr *)&server, sizeof(server)) == -1) {
# ifdef SO_REUSEADDR
        err_num = get_last_socket_error();
        if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) &&
#  ifdef OPENSSL_SYS_WINDOWS
            /*
             * Some versions of Windows define EADDRINUSE to a dummy value.
             */
            (err_num == WSAEADDRINUSE))
#  else
            (err_num == EADDRINUSE))
#  endif
        {
            memcpy((char *)&client, (char *)&server, sizeof(server));
            if (strcmp(h, "*") == 0)
                client.sin_addr.s_addr = htonl(0x7F000001);
            cs = socket(AF_INET, SOCK_STREAM, SOCKET_PROTOCOL);
            if (cs != INVALID_SOCKET) {
                int ii;
                ii = connect(cs, (struct sockaddr *)&client, sizeof(client));
                closesocket(cs);
                if (ii == INVALID_SOCKET) {
                    bind_mode = BIO_BIND_REUSEADDR;
                    closesocket(s);
                    goto again;
                }
                /* else error */
            }
            /* else error */
        }
# endif
        SYSerr(SYS_F_BIND, err_num);
        ERR_add_error_data(3, "port='", host, "'");
        BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_BIND_SOCKET);
        goto err;
    }
    if (listen(s, MAX_LISTEN) == -1) {
        SYSerr(SYS_F_BIND, get_last_socket_error());
        ERR_add_error_data(3, "port='", host, "'");
        BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_LISTEN_SOCKET);
        goto err;
    }
    ret = 1;
 err:
    if (str != NULL)
        OPENSSL_free(str);
    if ((ret == 0) && (s != INVALID_SOCKET)) {
        closesocket(s);
        s = INVALID_SOCKET;
    }
    return (s);
}

int BIO_accept(int sock, char **addr)
{
    int ret = INVALID_SOCKET;
    static struct sockaddr_in from;
    unsigned long l;
    unsigned short port;
    int len;
    char *p;

    memset((char *)&from, 0, sizeof(from));
    len = sizeof(from);
    /*
     * Note: under VMS with SOCKETSHR the fourth parameter is currently of
     * type (int *) whereas under other systems it is (void *) if you don't
     * have a cast it will choke the compiler: if you do have a cast then you
     * can either go for (int *) or (void *).
     */
    ret = accept(sock, (struct sockaddr *)&from, (void *)&len);
    if (ret == INVALID_SOCKET) {
        if (BIO_sock_should_retry(ret))
            return -2;
        SYSerr(SYS_F_ACCEPT, get_last_socket_error());
        BIOerr(BIO_F_BIO_ACCEPT, BIO_R_ACCEPT_ERROR);
        goto end;
    }

    if (addr == NULL)
        goto end;

    l = ntohl(from.sin_addr.s_addr);
    port = ntohs(from.sin_port);
    if (*addr == NULL) {
        if ((p = OPENSSL_malloc(24)) == NULL) {
            BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE);
            goto end;
        }
        *addr = p;
    }
    BIO_snprintf(*addr, 24, "%d.%d.%d.%d:%d",
                 (unsigned char)(l >> 24L) & 0xff,
                 (unsigned char)(l >> 16L) & 0xff,
                 (unsigned char)(l >> 8L) & 0xff,
                 (unsigned char)(l) & 0xff, port);
 end:
    return (ret);
}

int BIO_set_tcp_ndelay(int s, int on)
{
    int ret = 0;
# if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP))
    int opt;

#  ifdef SOL_TCP
    opt = SOL_TCP;
#  else
#   ifdef IPPROTO_TCP
    opt = IPPROTO_TCP;
#   endif
#  endif

    ret = setsockopt(s, opt, TCP_NODELAY, (char *)&on, sizeof(on));
# endif
    return (ret == 0);
}
#endif

int BIO_socket_nbio(int s, int mode)
{
    int ret = -1;
    int l;

    l = mode;
#ifdef FIONBIO
    ret = BIO_socket_ioctl(s, FIONBIO, &l);
#endif
    return (ret == 0);
}