Initial Alpine Version

1 files changed, 797 insertions, 0 deletions

diff --git a/imap/src/osdep/amiga/tcp_ami.c b/imap/src/osdep/amiga/tcp_ami.c
new file mode 100644
index 00000000..974717c0
--- /dev/null
+++ b/imap/src/osdep/amiga/tcp_ami.c
@@ -0,0 +1,797 @@
+/* ========================================================================
+ * Copyright 1988-2008 University of Washington
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 
+ * ========================================================================
+ */
+
+/*
+ * Program:	Amiga TCP/IP routines
+ *
+ * Author:	Mark Crispin
+ *		Networks and Distributed Computing
+ *		Computing & Communications
+ *		University of Washington
+ *		Administration Building, AG-44
+ *		Seattle, WA  98195
+ *		Internet: MRC@CAC.Washington.EDU
+ *
+ * Date:	1 August 1988
+ * Last Edited:	13 January 2008
+ */
+
+#undef write			/* don't use redefined write() */
+ 
+static tcptimeout_t tmoh = NIL;	/* TCP timeout handler routine */
+static long ttmo_open = 0;	/* TCP timeouts, in seconds */
+static long ttmo_read = 0;
+static long ttmo_write = 0;
+static long allowreversedns = T;/* allow reverse DNS lookup */
+static long tcpdebug = NIL;	/* extra TCP debugging telemetry */
+
+extern long maxposint;		/* get this from write.c */
+
+/* Local function prototypes */
+
+int tcp_socket_open (struct sockaddr_in *sin,char *tmp,int *ctr,char *hst,
+		     unsigned long port);
+static char *tcp_getline_work (TCPSTREAM *stream,unsigned long *size,
+			       long *contd);
+long tcp_abort (TCPSTREAM *stream);
+char *tcp_name (struct sockaddr_in *sin,long flag);
+char *tcp_name_valid (char *s);
+
+/* TCP/IP manipulate parameters
+ * Accepts: function code
+ *	    function-dependent value
+ * Returns: function-dependent return value
+ */
+
+void *tcp_parameters (long function,void *value)
+{
+  void *ret = NIL;
+  switch ((int) function) {
+  case SET_TIMEOUT:
+    tmoh = (tcptimeout_t) value;
+  case GET_TIMEOUT:
+    ret = (void *) tmoh;
+    break;
+  case SET_OPENTIMEOUT:
+    ttmo_open = (long) value;
+  case GET_OPENTIMEOUT:
+    ret = (void *) ttmo_open;
+    break;
+  case SET_READTIMEOUT:
+    ttmo_read = (long) value;
+  case GET_READTIMEOUT:
+    ret = (void *) ttmo_read;
+    break;
+  case SET_WRITETIMEOUT:
+    ttmo_write = (long) value;
+  case GET_WRITETIMEOUT:
+    ret = (void *) ttmo_write;
+    break;
+  case SET_ALLOWREVERSEDNS:
+    allowreversedns = (long) value;
+  case GET_ALLOWREVERSEDNS:
+    ret = (void *) allowreversedns;
+    break;
+  case SET_TCPDEBUG:
+    tcpdebug = (long) value;
+  case GET_TCPDEBUG:
+    ret = (void *) tcpdebug;
+    break;
+  }
+  return ret;
+}
+
+/* TCP/IP open
+ * Accepts: host name
+ *	    contact service name
+ *	    contact port number and optional silent flag
+ * Returns: TCP/IP stream if success else NIL
+ */
+
+TCPSTREAM *tcp_open (char *host,char *service,unsigned long port)
+{
+  TCPSTREAM *stream = NIL;
+  int i;
+  int sock = -1;
+  int ctr = 0;
+  int silent = (port & NET_SILENT) ? T : NIL;
+  int *ctrp = (port & NET_NOOPENTIMEOUT) ? NIL : &ctr;
+  char *s;
+  struct sockaddr_in sin;
+  struct hostent *he;
+  char hostname[MAILTMPLEN];
+  char tmp[MAILTMPLEN];
+  struct servent *sv = NIL;
+  blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
+  void *data;
+  port &= 0xffff;		/* erase flags */
+				/* lookup service */
+  if (service && (sv = getservbyname (service,"tcp")))
+    port = ntohs (sin.sin_port = sv->s_port);
+ 				/* copy port number in network format */
+  else sin.sin_port = htons (port);
+  /* The domain literal form is used (rather than simply the dotted decimal
+     as with other Amiga programs) because it has to be a valid "host name"
+     in mailsystem terminology. */
+				/* look like domain literal? */
+  if (host[0] == '[' && host[(strlen (host))-1] == ']') {
+    strcpy (hostname,host+1);	/* yes, copy number part */
+    hostname[(strlen (hostname))-1] = '\0';
+    if ((sin.sin_addr.s_addr = inet_addr (hostname)) == -1)
+      sprintf (tmp,"Bad format domain-literal: %.80s",host);
+    else {
+      sin.sin_family = AF_INET;	/* family is always Internet */
+      strcpy (hostname,host);	/* hostname is user's argument */
+      (*bn) (BLOCK_TCPOPEN,NIL);
+				/* get an open socket for this system */
+      sock = tcp_socket_open (&sin,tmp,ctrp,hostname,port);
+      (*bn) (BLOCK_NONE,NIL);
+    }
+  }
+
+  else {			/* lookup host name */
+    if (tcpdebug) {
+      sprintf (tmp,"DNS resolution %.80s",host);
+      mm_log (tmp,TCPDEBUG);
+    }
+    (*bn) (BLOCK_DNSLOOKUP,NIL);/* quell alarms */
+    data = (*bn) (BLOCK_SENSITIVE,NIL);
+    if (!(he = gethostbyname (lcase (strcpy (hostname,host)))))
+      sprintf (tmp,"No such host as %.80s",host);
+    (*bn) (BLOCK_NONSENSITIVE,data);
+    (*bn) (BLOCK_NONE,NIL);
+    if (he) {			/* DNS resolution won? */
+      if (tcpdebug) mm_log ("DNS resolution done",TCPDEBUG);
+				/* copy address type */
+      sin.sin_family = he->h_addrtype;
+				/* copy host name */
+      strcpy (hostname,he->h_name);
+#ifdef HOST_NOT_FOUND		/* muliple addresses only on DNS systems */
+      for (sock = -1,i = 0; (sock < 0) && (s = he->h_addr_list[i]); i++) {
+	if (i && !silent) mm_log (tmp,WARN);
+	memcpy (&sin.sin_addr,s,he->h_length);
+	(*bn) (BLOCK_TCPOPEN,NIL);
+	sock = tcp_socket_open (&sin,tmp,ctrp,hostname,port);
+	(*bn) (BLOCK_NONE,NIL);
+      }
+#else				/* the one true address then */
+      memcpy (&sin.sin_addr,he->h_addr,he->h_length);
+      (*bn) (BLOCK_TCPOPEN,NIL);
+      sock = tcp_socket_open (&sin,tmp,ctrp,hostname,port);
+      (*bn) (BLOCK_NONE,NIL);
+#endif
+    }
+  }
+  if (sock >= 0)  {		/* won */
+    stream = (TCPSTREAM *) memset (fs_get (sizeof (TCPSTREAM)),0,
+				   sizeof (TCPSTREAM));
+    stream->port = port;	/* port number */
+				/* init sockets */
+    stream->tcpsi = stream->tcpso = sock;
+				/* stash in the snuck-in byte */
+    if (stream->ictr = ctr) *(stream->iptr = stream->ibuf) = tmp[0];
+				/* copy official host name */
+    stream->host = cpystr (hostname);
+    if (tcpdebug) mm_log ("Stream open and ready for read",TCPDEBUG);
+  }
+  else if (!silent) mm_log (tmp,ERROR);
+  return stream;		/* return success */
+}
+
+/* Open a TCP socket
+ * Accepts: Internet socket address block
+ *	    scratch buffer
+ *	    pointer to "first byte read in" storage or NIL
+ *	    host name for error message
+ *	    port number for error message
+ * Returns: socket if success, else -1 with error string in scratch buffer
+ */
+
+int tcp_socket_open (struct sockaddr_in *sin,char *tmp,int *ctr,char *hst,
+		     unsigned long port)
+{
+  int i,ti,sock,flgs;
+  time_t now;
+  struct protoent *pt = getprotobyname ("tcp");
+  fd_set fds,efds;
+  struct timeval tmo;
+  blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
+  void *data = (*bn) (BLOCK_SENSITIVE,NIL);
+  sprintf (tmp,"Trying IP address [%s]",inet_ntoa (sin->sin_addr));
+  mm_log (tmp,NIL);
+				/* make a socket */
+  if ((sock = socket (sin->sin_family,SOCK_STREAM,pt ? pt->p_proto : 0)) < 0) {
+    sprintf (tmp,"Unable to create TCP socket: %s",strerror (errno));
+    (*bn) (BLOCK_NONSENSITIVE,data);
+    return -1;
+  }
+  else if (sock >= FD_SETSIZE) {/* unselectable sockets are useless */
+    sprintf (tmp,"Unable to create selectable TCP socket (%d >= %d)",
+	     sock,FD_SETSIZE);
+    (*bn) (BLOCK_NONSENSITIVE,data);
+    close (sock);
+    errno = EMFILE;
+    return -1;
+  }
+  flgs = fcntl (sock,F_GETFL,0);/* get current socket flags */
+				/* set non-blocking if want open timeout */
+  if (ctr) fcntl (sock,F_SETFL,flgs | FNDELAY);
+				/* open connection */
+  while ((i = connect (sock,(struct sockaddr *) sin,
+		       sizeof (struct sockaddr_in))) < 0 && (errno == EINTR));
+  (*bn) (BLOCK_NONSENSITIVE,data);
+  if (i < 0) switch (errno) {	/* failed? */
+  case EAGAIN:			/* DG brain damage */
+  case EINPROGRESS:		/* what we expect to happen */
+  case EALREADY:		/* or another form of it */
+  case EISCONN:			/* restart after interrupt? */
+  case EADDRINUSE:		/* restart after interrupt? */
+    break;			/* well, not really, it was interrupted */
+  default:
+    sprintf (tmp,"Can't connect to %.80s,%lu: %s",hst,port,strerror (errno));
+    close (sock);		/* flush socket */
+    return -1;
+  }
+
+  if (ctr) {			/* want open timeout */
+    now = time (0);		/* open timeout */
+    ti = ttmo_open ? now + ttmo_open : 0;
+    tmo.tv_usec = 0;
+    FD_ZERO (&fds);		/* initialize selection vector */
+    FD_ZERO (&efds);		/* handle errors too */
+    FD_SET (sock,&fds);		/* block for error or readable */
+    FD_SET (sock,&efds);
+    do {			/* block under timeout */
+      tmo.tv_sec = ti ? ti - now : 0;
+      i = select (sock+1,&fds,0,&efds,ti ? &tmo : 0);
+      now = time (0);		/* fake timeout if interrupt & time expired */
+      if ((i < 0) && (errno == EINTR) && ti && (ti <= now)) i = 0;
+    } while ((i < 0) && (errno == EINTR));
+    if (i > 0) {		/* success, make sure really connected */
+      fcntl (sock,F_SETFL,flgs);/* restore blocking status */
+      /* This used to be a zero-byte read(), but that crashes Solaris */
+				/* get socket status */
+      while (((i = *ctr = read (sock,tmp,1)) < 0) && (errno == EINTR));
+    }	
+    if (i <= 0) {		/* timeout or error? */
+      i = i ? errno : ETIMEDOUT;/* determine error code */
+      close (sock);		/* flush socket */
+      errno = i;		/* return error code */
+      sprintf (tmp,"Connection failed to %.80s,%lu: %s",hst,port,
+	       strerror (errno));
+      return -1;
+    }
+  }
+  return sock;			/* return the socket */
+}
+  
+/* TCP/IP authenticated open
+ * Accepts: host name
+ *	    service name
+ *	    returned user name buffer
+ * Returns: TCP/IP stream if success else NIL
+ */
+
+TCPSTREAM *tcp_aopen (NETMBX *mb,char *service,char *usrbuf)
+{
+  return NIL;			/* disabled */
+}
+
+/* TCP receive line
+ * Accepts: TCP stream
+ * Returns: text line string or NIL if failure
+ */
+
+char *tcp_getline (TCPSTREAM *stream)
+{
+  unsigned long n,contd;
+  char *ret = tcp_getline_work (stream,&n,&contd);
+  if (ret && contd) {		/* got a line needing continuation? */
+    STRINGLIST *stl = mail_newstringlist ();
+    STRINGLIST *stc = stl;
+    do {			/* collect additional lines */
+      stc->text.data = (unsigned char *) ret;
+      stc->text.size = n;
+      stc = stc->next = mail_newstringlist ();
+      ret = tcp_getline_work (stream,&n,&contd);
+    } while (ret && contd);
+    if (ret) {			/* stash final part of line on list */
+      stc->text.data = (unsigned char *) ret;
+      stc->text.size = n;
+				/* determine how large a buffer we need */
+      for (n = 0, stc = stl; stc; stc = stc->next) n += stc->text.size;
+      ret = fs_get (n + 1);	/* copy parts into buffer */
+      for (n = 0, stc = stl; stc; n += stc->text.size, stc = stc->next)
+	memcpy (ret + n,stc->text.data,stc->text.size);
+      ret[n] = '\0';
+    }
+    mail_free_stringlist (&stl);/* either way, done with list */
+  }
+  return ret;
+}
+
+/* TCP receive line or partial line
+ * Accepts: TCP stream
+ *	    pointer to return size
+ *	    pointer to return continuation flag
+ * Returns: text line string, size and continuation flag, or NIL if failure
+ */
+
+static char *tcp_getline_work (TCPSTREAM *stream,unsigned long *size,
+			       long *contd)
+{
+  unsigned long n;
+  char *s,*ret,c,d;
+  *contd = NIL;			/* assume no continuation */
+				/* make sure have data */
+  if (!tcp_getdata (stream)) return NIL;
+  for (s = stream->iptr, n = 0, c = '\0'; stream->ictr--; n++, c = d) {
+    d = *stream->iptr++;	/* slurp another character */
+    if ((c == '\015') && (d == '\012')) {
+      ret = (char *) fs_get (n--);
+      memcpy (ret,s,*size = n);	/* copy into a free storage string */
+      ret[n] = '\0';		/* tie off string with null */
+      return ret;
+    }
+  }
+				/* copy partial string from buffer */
+  memcpy ((ret = (char *) fs_get (n)),s,*size = n);
+				/* get more data from the net */
+  if (!tcp_getdata (stream)) fs_give ((void **) &ret);
+				/* special case of newline broken by buffer */
+  else if ((c == '\015') && (*stream->iptr == '\012')) {
+    stream->iptr++;		/* eat the line feed */
+    stream->ictr--;
+    ret[*size = --n] = '\0';	/* tie off string with null */
+  }
+  else *contd = LONGT;		/* continuation needed */
+  return ret;
+}
+
+/* TCP/IP receive buffer
+ * Accepts: TCP/IP stream
+ *	    size in bytes
+ *	    buffer to read into
+ * Returns: T if success, NIL otherwise
+ */
+
+long tcp_getbuffer (TCPSTREAM *stream,unsigned long size,char *s)
+{
+  unsigned long n;
+				/* make sure socket still alive */
+  if (stream->tcpsi < 0) return NIL;
+				/* can transfer bytes from buffer? */
+  if (n = min (size,stream->ictr)) {
+    memcpy (s,stream->iptr,n);	/* yes, slurp as much as we can from it */
+    s += n;			/* update pointer */
+    stream->iptr +=n;
+    size -= n;			/* update # of bytes to do */
+    stream->ictr -=n;
+  }
+  if (size) {
+    int i;
+    fd_set fds,efds;
+    struct timeval tmo;
+    time_t t = time (0);
+    blocknotify_t bn=(blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
+    (*bn) (BLOCK_TCPREAD,NIL);
+    while (size > 0) {		/* until request satisfied */
+      time_t tl = time (0);
+      time_t now = tl;
+      time_t ti = ttmo_read ? now + ttmo_read : 0;
+      if (tcpdebug) mm_log ("Reading TCP buffer",TCPDEBUG);
+      tmo.tv_usec = 0;
+      FD_ZERO (&fds);		/* initialize selection vector */
+      FD_ZERO (&efds);		/* handle errors too */
+      FD_SET (stream->tcpsi,&fds);
+      FD_SET (stream->tcpsi,&efds);
+      errno = NIL;		/* block and read */
+      do {			/* block under timeout */
+	tmo.tv_sec = ti ? ti - now : 0;
+	i = select (stream->tcpsi+1,&fds,0,&efds,ti ? &tmo : 0);
+	now = time (0);		/* fake timeout if interrupt & time expired */
+	if ((i < 0) && (errno == EINTR) && ti && (ti <= now)) i = 0;
+      } while ((i < 0) && (errno == EINTR));
+      if (i > 0) {		/* select says there's data to read? */
+	while (((i = read (stream->tcpsi,s,(int) min (maxposint,size))) < 0) &&
+	       (errno == EINTR));
+	if (i < 1) return tcp_abort (stream);
+	s += i;			/* point at new place to write */
+	size -= i;		/* reduce byte count */
+	if (tcpdebug) mm_log ("Successfully read TCP buffer",TCPDEBUG);
+      }
+      else if (i || !tmoh || !(*tmoh) (now - t,now - tl))
+	return tcp_abort (stream);
+    }
+    (*bn) (BLOCK_NONE,NIL);
+  }
+  *s = '\0';			/* tie off string */
+  return T;
+}
+
+/* TCP/IP receive data
+ * Accepts: TCP/IP stream
+ * Returns: T if success, NIL otherwise
+ */
+
+long tcp_getdata (TCPSTREAM *stream)
+{
+  int i;
+  fd_set fds,efds;
+  struct timeval tmo;
+  time_t t = time (0);
+  blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
+  if (stream->tcpsi < 0) return NIL;
+  (*bn) (BLOCK_TCPREAD,NIL);
+  while (stream->ictr < 1) {	/* if nothing in the buffer */
+    time_t tl = time (0);	/* start of request */
+    time_t now = tl;
+    time_t ti = ttmo_read ? now + ttmo_read : 0;
+    if (tcpdebug) mm_log ("Reading TCP data",TCPDEBUG);
+    tmo.tv_usec = 0;
+    FD_ZERO (&fds);		/* initialize selection vector */
+    FD_ZERO (&efds);		/* handle errors too */
+    FD_SET (stream->tcpsi,&fds);/* set bit in selection vector */
+    FD_SET(stream->tcpsi,&efds);/* set bit in error selection vector */
+    errno = NIL;		/* block and read */
+    do {			/* block under timeout */
+      tmo.tv_sec = ti ? ti - now : 0;
+      i = select (stream->tcpsi+1,&fds,0,&efds,ti ? &tmo : 0);
+      now = time (0);		/* fake timeout if interrupt & time expired */
+      if ((i < 0) && (errno == EINTR) && ti && (ti <= now)) i = 0;
+    } while ((i < 0) && (errno == EINTR));
+    if (i > 0) {		/* got data? */
+      while (((i = read (stream->tcpsi,stream->ibuf,BUFLEN)) < 0) &&
+	     (errno == EINTR));
+      if (i < 1) return tcp_abort (stream);
+      stream->iptr = stream->ibuf;/* point at TCP buffer */
+      stream->ictr = i;		/* set new byte count */
+      if (tcpdebug) mm_log ("Successfully read TCP data",TCPDEBUG);
+    }
+    else if (i || !tmoh || !(*tmoh) (now - t,now - tl))
+      return tcp_abort (stream);/* error or timeout no-continue */
+  }
+  (*bn) (BLOCK_NONE,NIL);
+  return T;
+}
+
+/* TCP/IP send string as record
+ * Accepts: TCP/IP stream
+ *	    string pointer
+ * Returns: T if success else NIL
+ */
+
+long tcp_soutr (TCPSTREAM *stream,char *string)
+{
+  return tcp_sout (stream,string,(unsigned long) strlen (string));
+}
+
+
+/* TCP/IP send string
+ * Accepts: TCP/IP stream
+ *	    string pointer
+ *	    byte count
+ * Returns: T if success else NIL
+ */
+
+long tcp_sout (TCPSTREAM *stream,char *string,unsigned long size)
+{
+  int i;
+  fd_set fds,efds;
+  struct timeval tmo;
+  time_t t = time (0);
+  blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
+  if (stream->tcpso < 0) return NIL;
+  (*bn) (BLOCK_TCPWRITE,NIL);
+  while (size > 0) {		/* until request satisfied */
+    time_t tl = time (0);	/* start of request */
+    time_t now = tl;
+    time_t ti = ttmo_write ? now + ttmo_write : 0;
+    if (tcpdebug) mm_log ("Writing to TCP",TCPDEBUG);
+    tmo.tv_usec = 0;
+    FD_ZERO (&fds);		/* initialize selection vector */
+    FD_ZERO (&efds);		/* handle errors too */
+    FD_SET (stream->tcpso,&fds);/* set bit in selection vector */
+    FD_SET(stream->tcpso,&efds);/* set bit in error selection vector */
+    errno = NIL;		/* block and write */
+    do {			/* block under timeout */
+      tmo.tv_sec = ti ? ti - now : 0;
+      i = select (stream->tcpso+1,0,&fds,&efds,ti ? &tmo : 0);
+      now = time (0);		/* fake timeout if interrupt & time expired */
+      if ((i < 0) && (errno == EINTR) && ti && (ti <= now)) i = 0;
+    } while ((i < 0) && (errno == EINTR));
+    if (i > 0) {		/* OK to send data? */
+      while (((i = write (stream->tcpso,string,size)) < 0) &&(errno == EINTR));
+      if (i < 0) return tcp_abort (stream);
+      size -= i;		/* how much we sent */
+      string += i;
+      if (tcpdebug) mm_log ("successfully wrote to TCP",TCPDEBUG);
+    }
+    else if (i || !tmoh || !(*tmoh) (now - t,now - tl))
+      return tcp_abort (stream);/* error or timeout no-continue */
+  }
+  (*bn) (BLOCK_NONE,NIL);
+  return T;			/* all done */
+}
+
+/* TCP/IP close
+ * Accepts: TCP/IP stream
+ */
+
+void tcp_close (TCPSTREAM *stream)
+{
+  tcp_abort (stream);		/* nuke the stream */
+				/* flush host names */
+  if (stream->host) fs_give ((void **) &stream->host);
+  if (stream->remotehost) fs_give ((void **) &stream->remotehost);
+  if (stream->localhost) fs_give ((void **) &stream->localhost);
+  fs_give ((void **) &stream);	/* flush the stream */
+}
+
+
+/* TCP/IP abort stream
+ * Accepts: TCP/IP stream
+ * Returns: NIL always
+ */
+
+long tcp_abort (TCPSTREAM *stream)
+{
+  blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
+  if (stream->tcpsi >= 0) {	/* no-op if no socket */
+    (*bn) (BLOCK_TCPCLOSE,NIL);
+    close (stream->tcpsi);	/* nuke the socket */
+    if (stream->tcpsi != stream->tcpso) close (stream->tcpso);
+    stream->tcpsi = stream->tcpso = -1;
+  }
+  (*bn) (BLOCK_NONE,NIL);
+  return NIL;
+}
+
+/* TCP/IP get host name
+ * Accepts: TCP/IP stream
+ * Returns: host name for this stream
+ */
+
+char *tcp_host (TCPSTREAM *stream)
+{
+  return stream->host;		/* use tcp_remotehost() if want guarantees */
+}
+
+
+/* TCP/IP get remote host name
+ * Accepts: TCP/IP stream
+ * Returns: host name for this stream
+ */
+
+char *tcp_remotehost (TCPSTREAM *stream)
+{
+  if (!stream->remotehost) {
+    struct sockaddr_in sin;
+    int sinlen = sizeof (struct sockaddr_in);
+    stream->remotehost =	/* get socket's peer name */
+      (getpeername (stream->tcpsi,(struct sockaddr *) &sin,(void *) &sinlen) ||
+       (sin.sin_family != AF_INET)) ?
+	 cpystr (stream->host) : tcp_name (&sin,NIL);
+  }
+  return stream->remotehost;
+}
+
+
+/* TCP/IP return port for this stream
+ * Accepts: TCP/IP stream
+ * Returns: port number for this stream
+ */
+
+unsigned long tcp_port (TCPSTREAM *stream)
+{
+  return stream->port;		/* return port number */
+}
+
+
+/* TCP/IP get local host name
+ * Accepts: TCP/IP stream
+ * Returns: local host name
+ */
+
+char *tcp_localhost (TCPSTREAM *stream)
+{
+  if (!stream->localhost) {
+    struct sockaddr_in sin;
+    int sinlen = sizeof (struct sockaddr_in);
+    stream->localhost =		/* get socket's name */
+      ((stream->port & 0xffff000) ||
+       getsockname (stream->tcpsi,(struct sockaddr *) &sin,(void *) &sinlen) ||
+       (sin.sin_family != AF_INET)) ?
+	 cpystr (mylocalhost ()) : tcp_name (&sin,NIL);
+  }
+  return stream->localhost;	/* return local host name */
+}
+
+/* TCP/IP get client host address (server calls only)
+ * Returns: client host address
+ */
+
+static char *myClientAddr = NIL;
+
+char *tcp_clientaddr ()
+{
+  if (!myClientAddr) {
+    struct sockaddr_in sin;
+    int sinlen = sizeof (struct sockaddr_in);
+    myClientAddr =		/* get stdin's peer name */
+      cpystr (getpeername (0,(struct sockaddr *) &sin,(void *) &sinlen) ?
+	      "UNKNOWN" : ((sin.sin_family == AF_INET) ?
+			   inet_ntoa (sin.sin_addr) : "NON-IPv4"));
+  }
+  return myClientAddr;
+}
+
+
+/* TCP/IP get client host name (server calls only)
+ * Returns: client host name
+ */
+
+static char *myClientHost = NIL;
+
+char *tcp_clienthost ()
+{
+  if (!myClientHost) {
+    struct sockaddr_in sin;
+    int sinlen = sizeof (struct sockaddr_in);
+    myClientHost =		/* get stdin's peer name */
+      getpeername (0,(struct sockaddr *) &sin,(void *) &sinlen) ?
+	cpystr ("UNKNOWN") : ((sin.sin_family == AF_INET) ?
+			      tcp_name (&sin,T) : cpystr ("NON-IPv4"));
+  }
+  return myClientHost;
+}
+
+/* TCP/IP get server host address (server calls only)
+ * Returns: server host address
+ */
+
+static char *myServerAddr = NIL;
+
+char *tcp_serveraddr ()
+{
+  if (!myServerAddr) {
+    struct sockaddr_in sin;
+    int sinlen = sizeof (struct sockaddr_in);
+    myServerAddr =		/* get stdin's peer name */
+      cpystr (getsockname (0,(struct sockaddr *) &sin,(void *) &sinlen) ?
+	      "UNKNOWN" : ((sin.sin_family == AF_INET) ?
+			   inet_ntoa (sin.sin_addr) : "NON-IPv4"));
+  }
+  return myServerAddr;
+}
+
+
+/* TCP/IP get server host name (server calls only)
+ * Returns: server host name
+ */
+
+static char *myServerHost = NIL;
+static long myServerPort = -1;
+
+char *tcp_serverhost ()
+{
+  if (!myServerHost) {
+    struct sockaddr_in sin;
+    int sinlen = sizeof (struct sockaddr_in);
+				/* get stdin's name */
+    if (getsockname (0,(struct sockaddr *) &sin,(void *) &sinlen) ||
+	(sin.sin_family != AF_INET)) myServerHost = cpystr (mylocalhost ());
+    else {
+      myServerHost = tcp_name (&sin,NIL);
+      myServerPort = ntohs (sin.sin_port);
+    }
+  }
+  return myServerHost;
+}
+
+
+/* TCP/IP get server port number (server calls only)
+ * Returns: server port number
+ */
+
+long tcp_serverport ()
+{
+  if (!myServerHost) tcp_serverhost ();
+  return myServerPort;
+}
+
+/* TCP/IP return canonical form of host name
+ * Accepts: host name
+ * Returns: canonical form of host name
+ */
+
+char *tcp_canonical (char *name)
+{
+  char *ret,host[MAILTMPLEN];
+  struct hostent *he;
+  blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
+  void *data;
+				/* look like domain literal? */
+  if (name[0] == '[' && name[strlen (name) - 1] == ']') return name;
+  (*bn) (BLOCK_DNSLOOKUP,NIL);	/* quell alarms */
+  data = (*bn) (BLOCK_SENSITIVE,NIL);
+  if (tcpdebug) {
+    sprintf (host,"DNS canonicalization %.80s",name);
+    mm_log (host,TCPDEBUG);
+  }
+				/* note that Amiga requires lowercase! */
+  ret = (he = gethostbyname (lcase (strcpy (host,name)))) ?
+    (char *) he->h_name : name;
+  (*bn) (BLOCK_NONSENSITIVE,data);
+  (*bn) (BLOCK_NONE,NIL);	/* alarms OK now */
+  if (tcpdebug) mm_log ("DNS canonicalization done",TCPDEBUG);
+  return ret;
+}
+
+
+/* TCP/IP return name from socket
+ * Accepts: socket
+ *	    verbose flag
+ * Returns: cpystr name
+ */
+
+char *tcp_name (struct sockaddr_in *sin,long flag)
+{
+  char *ret,*t,adr[MAILTMPLEN],tmp[MAILTMPLEN];
+  sprintf (ret = adr,"[%.80s]",inet_ntoa (sin->sin_addr));
+  if (allowreversedns) {
+    struct hostent *he;
+    blocknotify_t bn = (blocknotify_t)mail_parameters(NIL,GET_BLOCKNOTIFY,NIL);
+    void *data;
+    if (tcpdebug) {
+      sprintf (tmp,"Reverse DNS resolution %s",adr);
+      mm_log (tmp,TCPDEBUG);
+    }
+    (*bn) (BLOCK_DNSLOOKUP,NIL);/* quell alarms */
+    data = (*bn) (BLOCK_SENSITIVE,NIL);
+				/* translate address to name */
+    if (t = tcp_name_valid ((he = gethostbyaddr ((char *) &sin->sin_addr,
+						 sizeof (struct in_addr),
+						 sin->sin_family)) ?
+			    (char *) he->h_name : NIL)) {
+				/* produce verbose form if needed */
+      if (flag)	sprintf (ret = tmp,"%s %s",t,adr);
+      else ret = t;
+    }
+    (*bn) (BLOCK_NONSENSITIVE,data);
+    (*bn) (BLOCK_NONE,NIL);	/* alarms OK now */
+    if (tcpdebug) mm_log ("Reverse DNS resolution done",TCPDEBUG);
+  }
+  return cpystr (ret);
+}
+
+
+/* Validate name
+ * Accepts: domain name
+ * Returns: T if valid, NIL otherwise
+ */
+
+char *tcp_name_valid (char *s)
+{
+  int c;
+  char *ret,*tail;
+				/* must be non-empty and not too long */
+  if ((ret = (s && *s) ? s : NIL) && (tail = ret + NETMAXHOST)) {
+				/* must be alnum, dot, or hyphen */
+    while ((c = *s++) && (s <= tail) &&
+	   (((c >= 'A') && (c <= 'Z')) || ((c >= 'a') && (c <= 'z')) ||
+	    ((c >= '0') && (c <= '9')) || (c == '-') || (c == '.')));
+    if (c) ret = NIL;
+  }
+  return ret;
+}