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tcpip.c

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/*
 * Copyright (c) 1995-2004, Index Data
 * See the file LICENSE for details.
 *
 * $Id: tcpip.c,v 1.12 2004/11/18 15:18:14 heikki Exp $
 */
/**
 * \file tcpip.c
 * \brief Implements TCP/IP + SSL COMSTACK.
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#ifdef WIN32
#else
#include <unistd.h>
#endif

#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#if HAVE_OPENSSL_SSL_H
#include <openssl/ssl.h>
#include <openssl/err.h>
#endif

#include <yaz/comstack.h>
#include <yaz/tcpip.h>
#include <yaz/nmem.h>

#ifdef WIN32
#else
#include <netinet/tcp.h>
#endif

static int tcpip_close(COMSTACK h);
static int tcpip_put(COMSTACK h, char *buf, int size);
static int tcpip_get(COMSTACK h, char **buf, int *bufsize);
static int tcpip_connect(COMSTACK h, void *address);
static int tcpip_more(COMSTACK h);
static int tcpip_rcvconnect(COMSTACK h);
static int tcpip_bind(COMSTACK h, void *address, int mode);
static int tcpip_listen(COMSTACK h, char *raddr, int *addrlen,
             int (*check_ip)(void *cd, const char *a, int len, int type),
             void *cd);
static int tcpip_set_blocking(COMSTACK p, int blocking);

#if HAVE_OPENSSL_SSL_H
static int ssl_get(COMSTACK h, char **buf, int *bufsize);
static int ssl_put(COMSTACK h, char *buf, int size);
#endif

static COMSTACK tcpip_accept(COMSTACK h);
static char *tcpip_addrstr(COMSTACK h);
static void *tcpip_straddr(COMSTACK h, const char *str);

#if 0
#define TRC(x) x
#else
#define TRC(X)
#endif

#ifndef YAZ_SOCKLEN_T
#define YAZ_SOCKLEN_T int
#endif

/* this state is used for both SSL and straight TCP/IP */
typedef struct tcpip_state
{
    char *altbuf; /* alternate buffer for surplus data */
    int altsize;  /* size as xmalloced */
    int altlen;   /* length of data or 0 if none */

    int written;  /* -1 if we aren't writing */
    int towrite;  /* to verify against user input */
    int (*complete)(const unsigned char *buf, int len); /* length/comple. */
    struct sockaddr_in addr;  /* returned by cs_straddr */
    char buf[128]; /* returned by cs_addrstr */
#if HAVE_OPENSSL_SSL_H
    SSL_CTX *ctx;       /* current CTX. */
    SSL_CTX *ctx_alloc; /* If =ctx it is owned by CS. If 0 it is not owned */
    SSL *ssl;
    char cert_fname[256];
#endif
} tcpip_state;

#ifdef WIN32
static int tcpip_init (void)
{
    static int initialized = 0;
    if (!initialized)
    {
        WORD requested;
        WSADATA wd;

        requested = MAKEWORD(1, 1);
        if (WSAStartup(requested, &wd))
            return 0;
        initialized = 1;
    }
    return 1;
}
#else
static int tcpip_init (void)
{
    return 1;
}
#endif

/*
 * This function is always called through the cs_create() macro.
 * s >= 0: socket has already been established for us.
 */
COMSTACK tcpip_type(int s, int blocking, int protocol, void *vp)
{
    COMSTACK p;
    tcpip_state *sp;
    int new_socket;
#ifdef WIN32
    unsigned long tru = 1;
#endif

    if (!tcpip_init ())
        return 0;
    if (s < 0)
    {
      if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0)
          return 0;
      new_socket = 1;
    }
    else
      new_socket = 0;
    if (!(p = (struct comstack *)xmalloc(sizeof(struct comstack))))
      return 0;
    if (!(sp = (struct tcpip_state *)(p->cprivate =
                                         xmalloc(sizeof(tcpip_state)))))
      return 0;

    if (!((p->blocking = blocking)&1))
    {
#ifdef WIN32
        if (ioctlsocket(s, FIONBIO, &tru) < 0)
            return 0;
#else
        if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
            return 0;
#ifndef MSG_NOSIGNAL
        signal (SIGPIPE, SIG_IGN);
#endif
#endif
    }

    p->io_pending = 0;
    p->iofile = s;
    p->type = tcpip_type;
    p->protocol = (enum oid_proto) protocol;

    p->f_connect = tcpip_connect;
    p->f_rcvconnect = tcpip_rcvconnect;
    p->f_get = tcpip_get;
    p->f_put = tcpip_put;
    p->f_close = tcpip_close;
    p->f_more = tcpip_more;
    p->f_bind = tcpip_bind;
    p->f_listen = tcpip_listen;
    p->f_accept = tcpip_accept;
    p->f_addrstr = tcpip_addrstr;
    p->f_straddr = tcpip_straddr;
    p->f_set_blocking = tcpip_set_blocking;

    p->state = new_socket ? CS_ST_UNBND : CS_ST_IDLE; /* state of line */
    p->event = CS_NONE;
    p->cerrno = 0;
    p->stackerr = 0;

#if HAVE_OPENSSL_SSL_H
    sp->ctx = sp->ctx_alloc = 0;
    sp->ssl = 0;
    strcpy(sp->cert_fname, "yaz.pem");
#endif

    sp->altbuf = 0;
    sp->altsize = sp->altlen = 0;
    sp->towrite = sp->written = -1;
    if (protocol == PROTO_WAIS)
      sp->complete = completeWAIS;
    else
      sp->complete = cs_complete_auto;

    p->timeout = COMSTACK_DEFAULT_TIMEOUT;
    TRC(fprintf(stderr, "Created new TCPIP comstack\n"));

    return p;
}

#if HAVE_OPENSSL_SSL_H

COMSTACK ssl_type(int s, int blocking, int protocol, void *vp)
{
    tcpip_state *sp;
    COMSTACK p;

    p = tcpip_type (s, blocking, protocol, 0);
    if (!p)
      return 0;
    p->f_get = ssl_get;
    p->f_put = ssl_put;
    p->type = ssl_type;
    sp = (tcpip_state *) p->cprivate;

    sp->ctx = (SSL_CTX *) vp;  /* may be NULL */

    /* note: we don't handle already opened socket in SSL mode - yet */
    return p;
}
#endif

int tcpip_strtoaddr_ex(const char *str, struct sockaddr_in *add,
                       int default_port)
{
    struct hostent *hp;
    char *p, buf[512];
    short int port = default_port;
    unsigned tmpadd;

    if (!tcpip_init ())
        return 0;
    TRC(fprintf(stderr, "tcpip_strtoaddress: %s\n", str ? str : "NULL"));
    add->sin_family = AF_INET;
    strncpy(buf, str, 511);
    buf[511] = 0;
    if ((p = strchr(buf, '/')))
        *p = 0;
    if ((p = strchr(buf, ':')))
    {
        *p = 0;
        port = atoi(p + 1);
    }
    add->sin_port = htons(port);
    if (!strcmp("@", buf))
        add->sin_addr.s_addr = INADDR_ANY;
    else if ((hp = gethostbyname(buf)))
        memcpy(&add->sin_addr.s_addr, *hp->h_addr_list,
             sizeof(struct in_addr));
    else if ((tmpadd = (unsigned) inet_addr(buf)) != 0)
        memcpy(&add->sin_addr.s_addr, &tmpadd, sizeof(struct in_addr));
    else
        return 0;
    return 1;
}

void *tcpip_straddr(COMSTACK h, const char *str)
{
    tcpip_state *sp = (tcpip_state *)h->cprivate;
    int port = 210;

    if (h->protocol == PROTO_HTTP)
        port = 80;

    if (!tcpip_strtoaddr_ex (str, &sp->addr, port))
      return 0;
    return &sp->addr;
}

struct sockaddr_in *tcpip_strtoaddr(const char *str)
{
    static struct sockaddr_in add;
    
    if (!tcpip_strtoaddr_ex (str, &add, 210))
      return 0;
    return &add;
}

int tcpip_more(COMSTACK h)
{
    tcpip_state *sp = (tcpip_state *)h->cprivate;
    
    return sp->altlen && (*sp->complete)((unsigned char *) sp->altbuf,
      sp->altlen);
}

/*
 * connect(2) will block (sometimes) - nothing we can do short of doing
 * weird things like spawning subprocesses or threading or some weird junk
 * like that.
 */
int tcpip_connect(COMSTACK h, void *address)
{
    struct sockaddr_in *add = (struct sockaddr_in *)address;
    int r;
#ifdef __sun__
    int recbuflen;
    YAZ_SOCKLEN_T rbufsize = sizeof(recbuflen);
#endif
    TRC(fprintf(stderr, "tcpip_connect\n"));
    h->io_pending = 0;
    if (h->state != CS_ST_UNBND)
    {
        h->cerrno = CSOUTSTATE;
      return -1;
    }
#ifdef __sun__
    /* On Suns, you must set a bigger Receive Buffer BEFORE a call to connect
     * This gives the connect a chance to negotiate with the other side
     * (see 'man tcp') 
     */
    if ( getsockopt(h->iofile, SOL_SOCKET, SO_RCVBUF, (void *)&recbuflen, &rbufsize ) < 0 )
    {
        h->cerrno = CSYSERR;
        return -1;
    }
    TRC(fprintf( stderr, "Current Size of TCP Receive Buffer= %d\n",
             recbuflen ));
    recbuflen *= 10; /* lets be optimistic */
    if ( setsockopt(h->iofile, SOL_SOCKET, SO_RCVBUF, (void *)&recbuflen, rbufsize ) < 0 )
    {
        h->cerrno = CSYSERR;
        return -1;
    }
    if ( getsockopt(h->iofile, SOL_SOCKET, SO_RCVBUF, (void *)&recbuflen, &rbufsize ) )
    {
        h->cerrno = CSYSERR;
        return -1;
    }
    TRC(fprintf( stderr, "New Size of TCP Receive Buffer = %d\n",
             recbuflen ));
#endif
    r = connect(h->iofile, (struct sockaddr *) add, sizeof(*add));
    if (r < 0)
    {
#ifdef WIN32
        if (WSAGetLastError() == WSAEWOULDBLOCK)
        {
            h->event = CS_CONNECT;
            h->state = CS_ST_CONNECTING;
            h->io_pending = CS_WANT_WRITE;
            return 1;
        }
#else
        if (yaz_errno() == EINPROGRESS)
        {
            h->event = CS_CONNECT;
            h->state = CS_ST_CONNECTING;
            h->io_pending = CS_WANT_WRITE|CS_WANT_READ;
            return 1;
        }
#endif
        h->cerrno = CSYSERR;
        return -1;
    }
    h->event = CS_CONNECT;
    h->state = CS_ST_CONNECTING;

    return tcpip_rcvconnect (h);
}

/*
 * nop
 */
int tcpip_rcvconnect(COMSTACK h)
{
#if HAVE_OPENSSL_SSL_H
    tcpip_state *sp = (tcpip_state *)h->cprivate;
#endif
    TRC(fprintf(stderr, "tcpip_rcvconnect\n"));

    if (h->state == CS_ST_DATAXFER)
        return 0;
    if (h->state != CS_ST_CONNECTING)
    {
        h->cerrno = CSOUTSTATE;
      return -1;
    }
#if HAVE_OPENSSL_SSL_H
    if (h->type == ssl_type && !sp->ctx)
    {
      SSL_load_error_strings();
      SSLeay_add_all_algorithms();

      sp->ctx = sp->ctx_alloc = SSL_CTX_new (SSLv23_method());
      if (!sp->ctx)
      {
          h->cerrno = CSERRORSSL;
          return -1;
      }
    }
    if (sp->ctx)
    {
      int res;

      if (!sp->ssl)
      {
          sp->ssl = SSL_new (sp->ctx);
          SSL_set_fd (sp->ssl, h->iofile);
      }
      res = SSL_connect (sp->ssl);
      if (res <= 0)
      {
          int err = SSL_get_error(sp->ssl, res);
          if (err == SSL_ERROR_WANT_READ)
          {
            h->io_pending = CS_WANT_READ;
            return 1;
          }
          if (err == SSL_ERROR_WANT_WRITE)
          {
            h->io_pending = CS_WANT_WRITE;
            return 1;
          }
          h->cerrno = CSERRORSSL;
          return -1;
      }
    }
#endif
    h->event = CS_DATA;
    h->state = CS_ST_DATAXFER;
    return 0;
}

#define CERTF "ztest.pem"
#define KEYF "ztest.pem"

static void tcpip_setsockopt (int fd)
{
#if 0
    int len = 4096;
    int set = 1;
    
    if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char*)&set, sizeof(int)))
    {
        yaz_log(LOG_WARN|LOG_ERRNO, "setsockopt TCP_NODELAY");
    }
    if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char*)&len, sizeof(int)))
    {
        yaz_log(LOG_WARN|LOG_ERRNO, "setsockopt SNDBUF");
    }
    if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char*)&len, sizeof(int)))
    {
        yaz_log(LOG_WARN|LOG_ERRNO, "setsockopt RCVBUF");
    }
#endif
}

static int tcpip_bind(COMSTACK h, void *address, int mode)
{
    struct sockaddr *addr = (struct sockaddr *)address;
#ifdef WIN32
    BOOL one = 1;
#else
    unsigned long one = 1;
#endif

#if HAVE_OPENSSL_SSL_H
    tcpip_state *sp = (tcpip_state *)h->cprivate;
    if (h->type == ssl_type && !sp->ctx)
    {
      SSL_load_error_strings();
      SSLeay_add_all_algorithms();

      sp->ctx = sp->ctx_alloc = SSL_CTX_new (SSLv23_method());
      if (!sp->ctx)
      {
          h->cerrno = CSERRORSSL;
          return -1;
      }
    }
    if (sp->ctx)
    {
      if (sp->ctx_alloc)
      {
          int res;
          res = SSL_CTX_use_certificate_file (sp->ctx, sp->cert_fname,
                                    SSL_FILETYPE_PEM);
          if (res <= 0)
          {
            ERR_print_errors_fp(stderr);
            exit (2);
          }
          res = SSL_CTX_use_PrivateKey_file (sp->ctx, sp->cert_fname,
                                     SSL_FILETYPE_PEM);
          if (res <= 0)
          {
            ERR_print_errors_fp(stderr);
            exit (3);
          }
          res = SSL_CTX_check_private_key (sp->ctx);
          if (res <= 0)
          {
            ERR_print_errors_fp(stderr);
            exit(5);
          }
      }
      TRC (fprintf (stderr, "ssl_bind\n"));
    }
    else
    {
      TRC (fprintf (stderr, "tcpip_bind\n"));
    }
#else
    TRC (fprintf (stderr, "tcpip_bind\n"));
#endif
#ifndef WIN32
    if (setsockopt(h->iofile, SOL_SOCKET, SO_REUSEADDR, (char*) 
      &one, sizeof(one)) < 0)
    {
        h->cerrno = CSYSERR;
        return -1;
    }
#endif
    tcpip_setsockopt(h->iofile);
    if (bind(h->iofile, addr, sizeof(struct sockaddr_in)))
    {
        h->cerrno = CSYSERR;
        return -1;
    }
    if (mode == CS_SERVER && listen(h->iofile, 3) < 0)
    {
        h->cerrno = CSYSERR;
        return -1;
    }
    h->state = CS_ST_IDLE;
    h->event = CS_LISTEN;
    return 0;
}

int tcpip_listen(COMSTACK h, char *raddr, int *addrlen,
             int (*check_ip)(void *cd, const char *a, int len, int t),
             void *cd)
{
    struct sockaddr_in addr;
    YAZ_SOCKLEN_T len = sizeof(addr);

    TRC(fprintf(stderr, "tcpip_listen pid=%d\n", getpid()));
    if (h->state != CS_ST_IDLE)
    {
        h->cerrno = CSOUTSTATE;
        return -1;
    }
    h->newfd = accept(h->iofile, (struct sockaddr*)&addr, &len);
    if (h->newfd < 0)
    {
      if (
#ifdef WIN32
          WSAGetLastError() == WSAEWOULDBLOCK
#else
          yaz_errno() == EWOULDBLOCK 
#ifdef EAGAIN
#if EAGAIN != EWOULDBLOCK
            || yaz_errno() == EAGAIN
#endif
#endif
#endif
          )
          h->cerrno = CSNODATA;
      else
          h->cerrno = CSYSERR;
        return -1;
    }
    if (addrlen && (size_t) (*addrlen) >= sizeof(struct sockaddr_in))
        memcpy(raddr, &addr, *addrlen = sizeof(struct sockaddr_in));
    else if (addrlen)
        *addrlen = 0;
    if (check_ip && (*check_ip)(cd, (const char *) &addr,
        sizeof(addr), AF_INET))
    {
      h->cerrno = CSDENY;
#ifdef WIN32
        closesocket(h->newfd);
#else
        close(h->newfd);
#endif
      h->newfd = -1;
      return -1;
    }
    h->state = CS_ST_INCON;
    tcpip_setsockopt (h->newfd);
    return 0;
}

COMSTACK tcpip_accept(COMSTACK h)
{
    COMSTACK cnew;
    tcpip_state *state, *st = (tcpip_state *)h->cprivate;
#ifdef WIN32
    unsigned long tru = 1;
#endif

    TRC(fprintf(stderr, "tcpip_accept\n"));
    if (h->state == CS_ST_INCON)
    {
      if (!(cnew = (COMSTACK)xmalloc(sizeof(*cnew))))
      {
          h->cerrno = CSYSERR;
#ifdef WIN32
          closesocket(h->newfd);
#else
          close(h->newfd);
#endif
          h->newfd = -1;
          return 0;
      }
      memcpy(cnew, h, sizeof(*h));
      cnew->iofile = h->newfd;
      cnew->io_pending = 0;
      if (!(state = (tcpip_state *)
            (cnew->cprivate = xmalloc(sizeof(tcpip_state)))))
      {
          h->cerrno = CSYSERR;
          if (h->newfd != -1)
          {
#ifdef WIN32
            closesocket(h->newfd);
#else
            close(h->newfd);
#endif
            h->newfd = -1;
          }
          return 0;
      }
      if (!(cnew->blocking&1) && 
#ifdef WIN32
          (ioctlsocket(cnew->iofile, FIONBIO, &tru) < 0)
#else
          (fcntl(cnew->iofile, F_SETFL, O_NONBLOCK) < 0)
#endif
          )
      {
          h->cerrno = CSYSERR;
          if (h->newfd != -1)
          {
#ifdef WIN32
            closesocket(h->newfd);
#else
            close(h->newfd);
#endif
            h->newfd = -1;
          }
          xfree (cnew);
          xfree (state);
          return 0;
      }
      h->newfd = -1;
      state->altbuf = 0;
      state->altsize = state->altlen = 0;
      state->towrite = state->written = -1;
      state->complete = st->complete;
      cnew->state = CS_ST_ACCEPT;
      h->state = CS_ST_IDLE;
      
#if HAVE_OPENSSL_SSL_H
      state->ctx = st->ctx;
      state->ctx_alloc = 0;
      state->ssl = st->ssl;
      if (state->ctx)
      {
          state->ssl = SSL_new (state->ctx);
          SSL_set_fd (state->ssl, cnew->iofile);
      }
#endif
      h = cnew;
    }
    if (h->state == CS_ST_ACCEPT)
    {
#if HAVE_OPENSSL_SSL_H
      tcpip_state *state = (tcpip_state *)h->cprivate;
      if (state->ctx)
      {
          int res = SSL_accept (state->ssl);
          TRC(fprintf(stderr, "SSL_accept\n"));
          if (res <= 0)
          {
            int err = SSL_get_error(state->ssl, res);
            if (err == SSL_ERROR_WANT_READ)
            {
                h->io_pending = CS_WANT_READ;
                return h;
            }
            if (err == SSL_ERROR_WANT_WRITE)
            {
                h->io_pending = CS_WANT_WRITE;
                return h;
            }
            cs_close (h);
            return 0;
          }
      }
#endif
    }
    else
    {
        h->cerrno = CSOUTSTATE;
        return 0;
    }
    h->io_pending = 0;
    h->state = CS_ST_DATAXFER;
    h->event = CS_DATA;
    return h;
}

#define CS_TCPIP_BUFCHUNK 4096

/*
 * Return: -1 error, >1 good, len of buffer, ==1 incomplete buffer,
 * 0=connection closed.
 */
int tcpip_get(COMSTACK h, char **buf, int *bufsize)
{
    tcpip_state *sp = (tcpip_state *)h->cprivate;
    char *tmpc;
    int tmpi, berlen, rest, req, tomove;
    int hasread = 0, res;

    TRC(fprintf(stderr, "tcpip_get: bufsize=%d\n", *bufsize));
    if (sp->altlen) /* switch buffers */
    {
        TRC(fprintf(stderr, "  %d bytes in altbuf (0x%x)\n", sp->altlen,
            (unsigned) sp->altbuf));
        tmpc = *buf;
        tmpi = *bufsize;
        *buf = sp->altbuf;
        *bufsize = sp->altsize;
        hasread = sp->altlen;
        sp->altlen = 0;
        sp->altbuf = tmpc;
        sp->altsize = tmpi;
    }
    h->io_pending = 0;
    while (!(berlen = (*sp->complete)((unsigned char *)*buf, hasread)))
    {
        if (!*bufsize)
        {
            if (!(*buf = (char *)xmalloc(*bufsize = CS_TCPIP_BUFCHUNK)))
                return -1;
        }
        else if (*bufsize - hasread < CS_TCPIP_BUFCHUNK)
            if (!(*buf =(char *)xrealloc(*buf, *bufsize *= 2)))
                return -1;
#ifdef __sun__
      yaz_set_errno( 0 );
      /* unfortunatly, sun sometimes forgets to set errno in recv
         when EWOULDBLOCK etc. would be required (res = -1) */
#endif
      res = recv(h->iofile, *buf + hasread, CS_TCPIP_BUFCHUNK, 0);
      TRC(fprintf(stderr, "  recv res=%d, hasread=%d\n", res, hasread));
      if (res < 0)
      {
        TRC(fprintf(stderr, "  recv errno=%d, (%s)\n", yaz_errno(), 
                  strerror(yaz_errno())));
#ifdef WIN32
          if (WSAGetLastError() == WSAEWOULDBLOCK)
          {
            h->io_pending = CS_WANT_READ;
            break;
          }
          else
            return -1;
#else
          if (yaz_errno() == EWOULDBLOCK 
#ifdef EAGAIN   
#if EAGAIN != EWOULDBLOCK
                || yaz_errno() == EAGAIN
#endif
#endif
            || yaz_errno() == EINPROGRESS
#ifdef __sun__
            || yaz_errno() == ENOENT /* Sun's sometimes set errno to this */
#endif
            )
          {
            h->io_pending = CS_WANT_READ;
            break;
          }
          else if (yaz_errno() == 0)
            continue;
          else
              return -1;
#endif
      }
      else if (!res)
          return hasread;
        hasread += res;
    }
    TRC (fprintf (stderr, "  Out of read loop with hasread=%d, berlen=%d\n",
              hasread, berlen));
    /* move surplus buffer (or everything if we didn't get a BER rec.) */
    if (hasread > berlen)
    {
        tomove = req = hasread - berlen;
        rest = tomove % CS_TCPIP_BUFCHUNK;
        if (rest)
            req += CS_TCPIP_BUFCHUNK - rest;
        if (!sp->altbuf)
        {
            if (!(sp->altbuf = (char *)xmalloc(sp->altsize = req)))
                return -1;
        } else if (sp->altsize < req)
            if (!(sp->altbuf =(char *)xrealloc(sp->altbuf, sp->altsize = req)))
                return -1;
        TRC(fprintf(stderr, "  Moving %d bytes to altbuf(0x%x)\n", tomove,
            (unsigned) sp->altbuf));
        memcpy(sp->altbuf, *buf + berlen, sp->altlen = tomove);
    }
    if (berlen < CS_TCPIP_BUFCHUNK - 1)
        *(*buf + berlen) = '\0';
    return berlen ? berlen : 1;
}


#if HAVE_OPENSSL_SSL_H
/*
 * Return: -1 error, >1 good, len of buffer, ==1 incomplete buffer,
 * 0=connection closed.
 */
int ssl_get(COMSTACK h, char **buf, int *bufsize)
{
    tcpip_state *sp = (tcpip_state *)h->cprivate;
    char *tmpc;
    int tmpi, berlen, rest, req, tomove;
    int hasread = 0, res;

    TRC(fprintf(stderr, "ssl_get: bufsize=%d\n", *bufsize));
    if (sp->altlen) /* switch buffers */
    {
        TRC(fprintf(stderr, "  %d bytes in altbuf (0x%x)\n", sp->altlen,
            (unsigned) sp->altbuf));
        tmpc = *buf;
        tmpi = *bufsize;
        *buf = sp->altbuf;
        *bufsize = sp->altsize;
        hasread = sp->altlen;
        sp->altlen = 0;
        sp->altbuf = tmpc;
        sp->altsize = tmpi;
    }
    h->io_pending = 0;
    while (!(berlen = (*sp->complete)((unsigned char *)*buf, hasread)))
    {
        if (!*bufsize)
        {
            if (!(*buf = (char *)xmalloc(*bufsize = CS_TCPIP_BUFCHUNK)))
                return -1;
        }
        else if (*bufsize - hasread < CS_TCPIP_BUFCHUNK)
            if (!(*buf =(char *)xrealloc(*buf, *bufsize *= 2)))
                return -1;
      res = SSL_read (sp->ssl, *buf + hasread, CS_TCPIP_BUFCHUNK);
      TRC(fprintf(stderr, "  SSL_read res=%d, hasread=%d\n", res, hasread));
      if (res <= 0)
      {
          int ssl_err = SSL_get_error(sp->ssl, res);
          if (ssl_err == SSL_ERROR_WANT_READ)
          {
            h->io_pending = CS_WANT_READ;
            break;
          }
          if (ssl_err == SSL_ERROR_WANT_WRITE)
          {
            h->io_pending = CS_WANT_WRITE;
            break;
          }
          if (res == 0)
            return 0;
          h->cerrno = CSERRORSSL;
          return -1;
      }
      hasread += res;
    }
    TRC (fprintf (stderr, "  Out of read loop with hasread=%d, berlen=%d\n",
        hasread, berlen));
    /* move surplus buffer (or everything if we didn't get a BER rec.) */
    if (hasread > berlen)
    {
        tomove = req = hasread - berlen;
        rest = tomove % CS_TCPIP_BUFCHUNK;
        if (rest)
            req += CS_TCPIP_BUFCHUNK - rest;
        if (!sp->altbuf)
        {
            if (!(sp->altbuf = (char *)xmalloc(sp->altsize = req)))
                return -1;
        } else if (sp->altsize < req)
            if (!(sp->altbuf =(char *)xrealloc(sp->altbuf, sp->altsize = req)))
                return -1;
        TRC(fprintf(stderr, "  Moving %d bytes to altbuf(0x%x)\n", tomove,
            (unsigned) sp->altbuf));
        memcpy(sp->altbuf, *buf + berlen, sp->altlen = tomove);
    }
    if (berlen < CS_TCPIP_BUFCHUNK - 1)
        *(*buf + berlen) = '\0';
    return berlen ? berlen : 1;
}
#endif

/*
 * Returns 1, 0 or -1
 * In nonblocking mode, you must call again with same buffer while
 * return value is 1.
 */
int tcpip_put(COMSTACK h, char *buf, int size)
{
    int res;
    struct tcpip_state *state = (struct tcpip_state *)h->cprivate;

    TRC(fprintf(stderr, "tcpip_put: size=%d\n", size));
    h->io_pending = 0;
    h->event = CS_DATA;
    if (state->towrite < 0)
    {
        state->towrite = size;
        state->written = 0;
    }
    else if (state->towrite != size)
    {
        h->cerrno = CSWRONGBUF;
        return -1;
    }
    while (state->towrite > state->written)
    {
      if ((res =
           send(h->iofile, buf + state->written, size -
              state->written, 
#ifdef MSG_NOSIGNAL
              MSG_NOSIGNAL
#else
              0
#endif
             )) < 0)
      {
          if (
#ifdef WIN32
            WSAGetLastError() == WSAEWOULDBLOCK
#else
              yaz_errno() == EWOULDBLOCK 
#ifdef EAGAIN
#if EAGAIN != EWOULDBLOCK
             || yaz_errno() == EAGAIN
#endif
#endif
#ifdef __sun__
                || yaz_errno() == ENOENT /* Sun's sometimes set errno to this value! */
#endif
            || yaz_errno() == EINPROGRESS
#endif
            )
          {
            TRC(fprintf(stderr, "  Flow control stop\n"));
            h->io_pending = CS_WANT_WRITE;
            return 1;
          }
          h->cerrno = CSYSERR;
          return -1;
      }
      state->written += res;
      TRC(fprintf(stderr, "  Wrote %d, written=%d, nbytes=%d\n",
                res, state->written, size));
    }
    state->towrite = state->written = -1;
    TRC(fprintf(stderr, "  Ok\n"));
    return 0;
}


#if HAVE_OPENSSL_SSL_H
/*
 * Returns 1, 0 or -1
 * In nonblocking mode, you must call again with same buffer while
 * return value is 1.
 */
int ssl_put(COMSTACK h, char *buf, int size)
{
    int res;
    struct tcpip_state *state = (struct tcpip_state *)h->cprivate;

    TRC(fprintf(stderr, "ssl_put: size=%d\n", size));
    h->io_pending = 0;
    h->event = CS_DATA;
    if (state->towrite < 0)
    {
        state->towrite = size;
        state->written = 0;
    }
    else if (state->towrite != size)
    {
        h->cerrno = CSWRONGBUF;
        return -1;
    }
    while (state->towrite > state->written)
    {
      res = SSL_write (state->ssl, buf + state->written,
                   size - state->written);
      if (res <= 0)
      {
          int ssl_err = SSL_get_error(state->ssl, res);
          if (ssl_err == SSL_ERROR_WANT_READ)
          {
            h->io_pending = CS_WANT_READ;
            return 1;
          }
          if (ssl_err == SSL_ERROR_WANT_WRITE)
          {
            h->io_pending = CS_WANT_WRITE;
            return 1;
          }
          h->cerrno = CSERRORSSL;
          return -1;
      }
      state->written += res;
      TRC(fprintf(stderr, "  Wrote %d, written=%d, nbytes=%d\n",
                res, state->written, size));
    }
    state->towrite = state->written = -1;
    TRC(fprintf(stderr, "  Ok\n"));
    return 0;
}
#endif

int tcpip_close(COMSTACK h)
{
    tcpip_state *sp = (struct tcpip_state *)h->cprivate;

    TRC(fprintf(stderr, "tcpip_close\n"));
    if (h->iofile != -1)
    {
#if HAVE_OPENSSL_SSL_H
      if (sp->ssl)
      {
          SSL_shutdown (sp->ssl);
      }
#endif
#ifdef WIN32
        closesocket(h->iofile);
#else
        close(h->iofile);
#endif
    }
    if (sp->altbuf)
        xfree(sp->altbuf);
#if HAVE_OPENSSL_SSL_H
    if (sp->ssl)
    {
      TRC (fprintf(stderr, "SSL_free\n"));
      SSL_free (sp->ssl);
    }
    sp->ssl = 0;
    if (sp->ctx_alloc)
      SSL_CTX_free (sp->ctx_alloc);
#endif
    xfree(sp);
    xfree(h);
    return 0;
}

char *tcpip_addrstr(COMSTACK h)
{
    struct sockaddr_in addr;
    tcpip_state *sp = (struct tcpip_state *)h->cprivate;
    char *r = 0, *buf = sp->buf;
    YAZ_SOCKLEN_T len;
    struct hostent *host;
    
    len = sizeof(addr);
    if (getpeername(h->iofile, (struct sockaddr*) &addr, &len) < 0)
    {
      h->cerrno = CSYSERR;
      return 0;
    }
    if (!(h->blocking&2)) {
        if ((host = gethostbyaddr((char*)&addr.sin_addr, sizeof(addr.sin_addr),
                        AF_INET)))
          r = (char*) host->h_name;
    }
    if (!r)
      r = inet_ntoa(addr.sin_addr);
    if (h->protocol == PROTO_HTTP)
        sprintf(buf, "http:%s", r);
    else
        sprintf(buf, "tcp:%s", r);
#if HAVE_OPENSSL_SSL_H
    if (sp->ctx)
    {
        if (h->protocol == PROTO_HTTP)
            sprintf(buf, "https:%s", r);
        else
            sprintf(buf, "ssl:%s", r);
    }
#endif
    return buf;
}

int static tcpip_set_blocking(COMSTACK p, int blocking)
{
    unsigned long flag;
    
    if (p->blocking == blocking)
      return 1;
#ifdef WIN32
    flag = 1;
    if (ioctlsocket(p->iofile, FIONBIO, &flag) < 0)
      return 0;
#else
    flag = fcntl(p->iofile, F_GETFL, 0);
    if(!(blocking&1))
      flag = flag & ~O_NONBLOCK;
    else
        flag = flag | O_NONBLOCK;
    if (fcntl(p->iofile, F_SETFL, flag) < 0)
      return 0;
#endif
    p->blocking = blocking;
    return 1;
}

#if HAVE_OPENSSL_SSL_H
int cs_set_ssl_ctx(COMSTACK cs, void *ctx)
{
    struct tcpip_state *sp;
    if (!cs || cs->type != ssl_type)
        return 0;
    sp = (struct tcpip_state *) cs->cprivate;
    if (sp->ctx_alloc)
      return 0;
    sp->ctx = (SSL_CTX *) ctx;
    return 1;
}

void *cs_get_ssl(COMSTACK cs)
{
    struct tcpip_state *sp;
    if (!cs || cs->type != ssl_type)
        return 0;
    sp = (struct tcpip_state *) cs->cprivate;
    return sp->ssl;  
}

int cs_set_ssl_certificate_file(COMSTACK cs, const char *fname)
{
    struct tcpip_state *sp;
    if (!cs || cs->type != ssl_type)
      return 0;
    sp = (struct tcpip_state *) cs->cprivate;
    strncpy(sp->cert_fname, fname, sizeof(sp->cert_fname)-1);
    sp->cert_fname[sizeof(sp->cert_fname)-1] = '\0';
    return 1;
}

int cs_get_peer_certificate_x509(COMSTACK cs, char **buf, int *len)
{
    SSL *ssl = (SSL *) cs_get_ssl(cs);
    if (ssl)
    {
      X509 *server_cert = SSL_get_peer_certificate (ssl);
      if (server_cert)
      {
          BIO *bio = BIO_new(BIO_s_mem());
          char *pem_buf;
          /* get PEM buffer in memory */
          PEM_write_bio_X509(bio, server_cert);
          *len = BIO_get_mem_data(bio, &pem_buf);
          *buf = (char *) xmalloc(*len);
          memcpy(*buf, pem_buf, *len);
          BIO_free(bio);
          return 1;
      }
    }
    return 0;
}
#else
int cs_set_ssl_ctx(COMSTACK cs, void *ctx)
{
    return 0;
}

void *cs_get_ssl(COMSTACK cs)
{
    return 0;
}

int cs_get_peer_certificate_x509(COMSTACK cs, char **buf, int *len)
{
    return 0;
}

int cs_set_ssl_certificate_file(COMSTACK cs, const char *fname)
{
    return 0;
}
#endif


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