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tcp_ami.c
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C/C++ Source or Header
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1998-10-25
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20KB
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645 lines
/*
* 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: 25 October 1998
*
* Copyright 1998 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made available
* "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#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 alarmsave = 0; /* save alarms */
/* Local function prototypes */
int tcp_socket_open (struct sockaddr_in *sin,char *tmp,int *ctr,char *hst,
unsigned long port);
long tcp_abort (TCPSTREAM *stream);
/* TCP/IP manipulate parameters
* Accepts: function code
* function-dependent value
* Returns: function-dependent return value
*/
void *tcp_parameters (long function,void *value)
{
switch ((int) function) {
case SET_TIMEOUT:
tmoh = (tcptimeout_t) value;
break;
case GET_TIMEOUT:
value = (void *) tmoh;
break;
case SET_OPENTIMEOUT:
ttmo_open = (long) value;
break;
case GET_OPENTIMEOUT:
value = (void *) ttmo_open;
break;
case SET_READTIMEOUT:
ttmo_read = (long) value;
break;
case GET_READTIMEOUT:
value = (void *) ttmo_read;
break;
case SET_WRITETIMEOUT:
ttmo_write = (long) value;
break;
case GET_WRITETIMEOUT:
value = (void *) ttmo_write;
break;
case SET_ALARMSAVE:
alarmsave = (long) value;
break;
case GET_ALARMSAVE:
value = (void *) alarmsave;
break;
default:
value = NIL; /* error case */
break;
}
return value;
}
/* TCP/IP open
* Accepts: host name
* contact service name
* contact port number
* Returns: TCP/IP stream if success else NIL
*/
TCPSTREAM *tcp_open (char *host,char *service,unsigned long port)
{
TCPSTREAM *stream = NIL;
int i,j,sock;
int ctr = 0;
char *s;
struct sockaddr_in sin;
struct hostent *he;
char hostname[MAILTMPLEN];
char tmp[MAILTMPLEN];
struct servent *sv = NIL;
if (service) { /* service specified? */
if (*service == '*') { /* yes, special alt driver kludge? */
ctrp = NIL; /* yes, don't do open timeout */
sv = getservbyname (service + 1,"tcp");
}
else sv = getservbyname (service,"tcp");
}
/* user service name port */
if (sv) 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 Unix 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) {
sin.sin_family = AF_INET; /* family is always Internet */
strcpy (hostname,host); /* hostname is user's argument */
/* get an open socket for this system */
sock = tcp_socket_open (&sin,tmp,&ctr,hostname,port);
}
else {
sprintf (tmp,"Bad format domain-literal: %.80s",host);
mm_log (tmp,ERROR);
return NIL;
}
}
else { /* lookup host name */
/* quell alarms */
i = alarmsave ? (int) max (alarm (0),1) : 0;
if (he = gethostbyname (lcase (strcpy (hostname,host)))) {
if (i) alarm (i); /* restore alarms */
/* copy address type */
sin.sin_family = he->h_addrtype;
/* copy host name */
strcpy (hostname,he->h_name);
for (sock = -1,i = 0; (sock < 0) && (s = he->h_addr_list[i]); i++) {
if (i) mm_log (tmp,WARN);
memcpy (&sin.sin_addr,s,he->h_length);
sock = tcp_socket_open (&sin,tmp,&ctr,hostname,port);
}
}
else {
if (i) alarm (i); /* restore alarms */
sprintf (tmp,"No such host as %.80s",host);
mm_log (tmp,ERROR);
return NIL;
}
}
if (sock < 0) mm_log (tmp,ERROR);
else { /* 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);
}
return stream; /* return success */
}
/* Open a TCP socket
* Accepts: Internet socket address block
* scratch buffer
* pointer to "first byte read in" storage
* 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,sock,flgs;
struct protoent *pt = getprotobyname ("ip");
fd_set fds,efds;
struct timeval tmo;
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));
return -1;
}
flgs = fcntl (sock,F_GETFL,0);/* get current socket flags */
fcntl (sock,F_SETFL,flgs | FNDELAY);
/* open connection */
while ((i = connect (sock,(struct sockaddr *) sin,
sizeof (struct sockaddr_in))) < 0 && errno == EINTR);
if (i < 0) switch (errno) { /* failed? */
case EAGAIN: /* DG brain damage */
case EINPROGRESS: /* what we expect to happen */
case EISCONN: /* restart after interrupt? */
case EADDRINUSE: /* restart after interrupt? */
break; /* well, not really, it was interrupted */
default:
i = errno; /* make sure close() doesn't stomp it */
close (sock); /* flush socket */
errno = i;
sprintf (tmp,"Can't connect to %.80s,%d: %s",hst,port,strerror (errno));
return -1;
}
tmo.tv_sec = ttmo_open; /* open timeout */
tmo.tv_usec = 0;
FD_ZERO (&fds); /* initialize selection vector */
FD_ZERO (&efds); /* handle errors too */
FD_SET (sock,&fds); /* block for error or writeable */
FD_SET (sock,&efds);
/* block under timeout */
while (((i = select (sock+1,0,&fds,&efds,ttmo_open ? &tmo : 0)) < 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,%d: %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;
}
/* TCP/IP receive line
* Accepts: TCP/IP stream
* Returns: text line string or NIL if failure
*/
char *tcp_getline (TCPSTREAM *stream)
{
int n,m;
char *st,*ret,*stp;
char c = '\0';
char d;
/* make sure have data */
if (!tcp_getdata (stream)) return NIL;
st = stream->iptr; /* save start of string */
n = 0; /* init string count */
while (stream->ictr--) { /* look for end of line */
d = *stream->iptr++; /* slurp another character */
if ((c == '\015') && (d == '\012')) {
ret = (char *) fs_get (n--);
memcpy (ret,st,n); /* copy into a free storage string */
ret[n] = '\0'; /* tie off string with null */
return ret;
}
n++; /* count another character searched */
c = d; /* remember previous character */
}
/* copy partial string from buffer */
memcpy ((ret = stp = (char *) fs_get (n)),st,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[n - 1] = '\0'; /* tie off string with null */
}
/* else recurse to get remainder */
else if (st = tcp_getline (stream)) {
ret = (char *) fs_get (n + 1 + (m = strlen (st)));
memcpy (ret,stp,n); /* copy first part */
memcpy (ret + n,st,m); /* and second part */
fs_give ((void **) &stp); /* flush first part */
fs_give ((void **) &st); /* flush second part */
ret[n + m] = '\0'; /* tie off string with null */
}
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 *buffer)
{
unsigned long n;
char *bufptr = buffer;
while (size > 0) { /* until request satisfied */
if (!tcp_getdata (stream)) return NIL;
n = min (size,stream->ictr);/* number of bytes to transfer */
/* do the copy */
memcpy (bufptr,stream->iptr,n);
bufptr += n; /* update pointer */
stream->iptr +=n;
size -= n; /* update # of bytes to do */
stream->ictr -=n;
}
bufptr[0] = '\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);
if (stream->tcpsi < 0) return NIL;
while (stream->ictr < 1) { /* if nothing in the buffer */
time_t tl = time (0); /* start of request */
tmo.tv_sec = ttmo_read; /* read timeout */
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 */
while (((i = select (stream->tcpsi+1,&fds,0,&efds,ttmo_read ? &tmo : 0))<0)
&& (errno == EINTR));
if (!i) { /* timeout? */
time_t tc = time (0);
if (tmoh && ((*tmoh) (tc - t,tc - tl))) continue;
else return tcp_abort (stream);
}
else if (i < 0) return tcp_abort (stream);
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 */
}
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;
struct timeval tmo;
time_t t = time (0);
if (stream->tcpso < 0) return NIL;
while (size > 0) { /* until request satisfied */
time_t tl = time (0); /* start of request */
tmo.tv_sec = ttmo_write; /* write timeout */
tmo.tv_usec = 0;
FD_ZERO (&fds); /* initialize selection vector */
FD_SET (stream->tcpso,&fds);/* set bit in selection vector */
errno = NIL; /* block and write */
while (((i = select (stream->tcpso+1,0,&fds,0,ttmo_write ? &tmo : 0)) < 0)
&& (errno == EINTR));
if (!i) { /* timeout? */
time_t tc = time (0);
if (tmoh && ((*tmoh) (tc - t,tc - tl))) continue;
else return tcp_abort (stream);
}
else if (i < 0) return tcp_abort (stream);
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;
}
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)
{
int i;
if (stream->tcpsi >= 0) { /* no-op if no socket */
close (stream->tcpsi); /* nuke the socket */
if (stream->tcpsi != stream->tcpso) close (stream->tcpso);
stream->tcpsi = stream->tcpso = -1;
}
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) {
char *s,tmp[MAILTMPLEN];
struct hostent *he;
struct sockaddr_in sin;
int sinlen = sizeof (struct sockaddr_in);
if (getpeername (stream->tcpsi,(struct sockaddr *) &sin,&sinlen))
s = stream->host;
#ifndef DISABLE_REVERSE_DNS_LOOKUP
/* Guarantees that the client will have the same string as the server does
* from calling tcp_serverhost ().
*/
else if (he = gethostbyaddr ((char *) &sin.sin_addr,
sizeof (struct in_addr),sin.sin_family))
s = he->h_name;
#else
/* Not recommended. In any mechanism (e.g. Kerberos) in which both client
* and server must agree on the name of the server system, this may cause
* the client to have a different idea of the server's name from the server.
* This is particularly important in those cases where a server has multiple
* CNAMEs; the gethostbyaddr() will canonicalize the name to the proper IP
* address.
*/
#endif
else sprintf (s = tmp,"[%s]",inet_ntoa (sin.sin_addr));
stream->remotehost = cpystr (s);
}
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) {
char *s,tmp[MAILTMPLEN];
struct hostent *he;
struct sockaddr_in sin;
int sinlen = sizeof (struct sockaddr_in);
/* get socket address */
if ((stream->port & 0xffff000) ||
getsockname (stream->tcpsi,(struct sockaddr *) &sin,&sinlen))
s = mylocalhost (); /* not a socket or failed, use my name */
#ifndef DISABLE_REVERSE_DNS_LOOKUP
/* Guarantees that the client will have the same string as the server will
* get in doing a reverse DNS lookup on the client's IP address.
*/
/* translate socket address to name */
else if (he = gethostbyaddr ((char *) &sin.sin_addr,
sizeof (struct in_addr),sin.sin_family))
s = he->h_name;
#else
/* Not recommended. In any mechanism (e.g. SMTP or NNTP) in which both
* client and server must agree on the name of the client system, this may
* cause the client to use the wrong name.
*/
#endif
else sprintf (s = tmp,"[%s]",inet_ntoa (sin.sin_addr));
stream->localhost = cpystr (s);
}
return stream->localhost; /* return local host name */
}
/* TCP/IP get client host name (server calls only)
* Returns: client host name
*/
static char *myClientHost = NIL;
char *tcp_clienthost ()
{
if (!myClientHost) {
char *s,tmp[MAILTMPLEN];
struct hostent *he;
struct sockaddr_in sin;
int sinlen = sizeof (struct sockaddr_in);
if (getpeername (0,(struct sockaddr *) &sin,&sinlen)) s = "UNKNOWN";
#ifndef DISABLE_REVERSE_DNS_LOOKUP
/* Includes both client name and IP address in syslog() output. */
else if (he = gethostbyaddr ((char *) &sin.sin_addr,
sizeof (struct in_addr),sin.sin_family))
sprintf (s = tmp,"%s [%s]",he->h_name,inet_ntoa (sin.sin_addr));
#else
/* Not recommended. Syslog output will only have the client IP address. */
#endif
else sprintf (s = tmp,"[%s]",inet_ntoa (sin.sin_addr));
myClientHost = cpystr (s);
}
return myClientHost;
}
/* 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) {
char *s,tmp[MAILTMPLEN];
struct hostent *he;
struct sockaddr_in sin;
int sinlen = sizeof (struct sockaddr_in);
/* get socket address */
if (getsockname (0,(struct sockaddr *) &sin,(void *) &sinlen))
s = mylocalhost ();
else {
#ifndef DISABLE_REVERSE_DNS_LOOKUP
myServerPort = ntohs (sin.sin_port);
/* Guarantees that the server will have the same string as the client
* does from calling tcp_remotehost ().
*/
if (he = gethostbyaddr ((char *) &sin.sin_addr,
sizeof (struct in_addr),sin.sin_family))
s = he->h_name;
else
#else
/* Not recommended. In any mechanism (e.g. Kerberos) in which both
* client and server must agree on the name of the server system, this
* may cause a spurious mismatch. This is particularly important when
* multiple server systems are co-located on the same CPU with different
* IP addresses; the gethostbyaddr() call will return the name of the
* proper server system name and avoid canonicalizing it to a default
* name.
*/
#endif
sprintf (s = tmp,"[%s]",inet_ntoa (sin.sin_addr));
}
myServerHost = cpystr (s);
}
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 host[MAILTMPLEN];
struct hostent *he;
/* look like domain literal? */
if (name[0] == '[' && name[strlen (name) - 1] == ']') return name;
/* note that Unix requires lowercase! */
else return (he = gethostbyname (lcase (strcpy (host,name)))) ?
he->h_name : name;
}