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/* ========================================================================
* 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: Winsock TCP/IP routines
*
* Author: Mark Crispin from Mike Seibel's Winsock code
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 11 April 1989
* Last Edited: 13 January 2008
*/
#define TCPMAXSEND 32768
/* Private functions */
int tcp_socket_open (struct sockaddr_in *sin,char *tmp,char *hst,
unsigned long port);
static char *tcp_getline_work (TCPSTREAM *stream,unsigned long *size,
long *contd);
long tcp_abort (TCPSTREAM *stream);
long tcp_close_socket (SOCKET *sock);
char *tcp_name (struct sockaddr_in *sin,long flag);
char *tcp_name_valid (char *s);
/* Private data */
int wsa_initted = 0; /* init ? */
static int wsa_sock_open = 0; /* keep track of open sockets */
static tcptimeout_t tmoh = NIL; /* TCP timeout handler routine */
static long ttmo_read = 0; /* TCP timeouts, in seconds */
static long ttmo_write = 0;
static long allowreversedns = T;/* allow reverse DNS lookup */
static long tcpdebug = NIL; /* extra TCP debugging telemetry */
/* 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_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;
SOCKET sock = INVALID_SOCKET;
int silent = (port & NET_SILENT) ? T : NIL;
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);
if (!wsa_initted++) { /* init Windows Sockets */
WSADATA wsock;
if (i = (int) WSAStartup (WSA_VERSION,&wsock)) {
wsa_initted = 0; /* in case we try again */
sprintf (tmp,"Unable to start Windows Sockets (%d)",i);
mm_log (tmp,ERROR);
return NIL;
}
}
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 ((u_short) port);
/* The domain literal form is used (rather than simply the dotted decimal
as with other Windows programs) because it has to be a valid "host name"
in mailsystem terminology. */
sin.sin_family = AF_INET; /* family is always Internet */
/* look like domain literal? */
if (host[0] == '[' && host[(strlen (host))-1] == ']') {
strcpy (tmp,host+1); /* yes, copy number part */
tmp[strlen (tmp)-1] = '\0';
if ((sin.sin_addr.s_addr = inet_addr (tmp)) == INADDR_NONE) {
sprintf (tmp,"Bad format domain-literal: %.80s",host);
mm_log (tmp,ERROR);
return NIL;
}
else {
sin.sin_family = AF_INET; /* family is always Internet */
strcpy (hostname,host);
(*bn) (BLOCK_TCPOPEN,NIL);
sock = tcp_socket_open (&sin,tmp,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);/* look up name */
if (!(he = gethostbyname (lcase (strcpy (tmp,host)))))
sprintf (tmp,"Host not found (#%d): %s",WSAGetLastError(),host);
(*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);
wsa_sock_open++; /* prevent tcp_close_socket() from freeing in
loop */
for (i = 0; (sock == INVALID_SOCKET) && (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,hostname,port);
(*bn) (BLOCK_NONE,NIL);
}
wsa_sock_open--; /* undo protection */
}
}
if (sock == INVALID_SOCKET) { /* error? */
if (!silent) mm_log (tmp,ERROR);
tcp_close_socket (&sock); /* do possible cleanup action */
}
else { /* got a socket, create TCP/IP stream */
stream = (TCPSTREAM *) memset (fs_get (sizeof (TCPSTREAM)),0,
sizeof (TCPSTREAM));
stream->port = port; /* port number */
/* init socket */
stream->tcpsi = stream->tcpso = sock;
stream->ictr = 0; /* init input counter */
/* copy official host name */
stream->host = cpystr (hostname);
if (tcpdebug) mm_log ("Stream open and ready for read",TCPDEBUG);
}
return stream; /* return success */
}
/* Open a TCP socket
* Accepts: Internet socket address block
* scratch buffer
* 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,char *hst,
unsigned long port)
{
int sock;
char *s;
sprintf (tmp,"Trying IP address [%s]",inet_ntoa (sin->sin_addr));
mm_log (tmp,NIL);
/* get a TCP stream */
if ((sock = socket (sin->sin_family,SOCK_STREAM,0)) == INVALID_SOCKET) {
sprintf (tmp,"Unable to create TCP socket (%d)",WSAGetLastError());
return -1;
}
wsa_sock_open++; /* count this socket as open */
/* open connection */
if (connect (sock,(struct sockaddr *) sin,sizeof (struct sockaddr_in)) ==
SOCKET_ERROR) {
switch (WSAGetLastError ()){/* analyze error */
case WSAECONNREFUSED:
s = "Refused";
break;
case WSAENOBUFS:
s = "Insufficient system resources";
break;
case WSAETIMEDOUT:
s = "Timed out";
break;
case WSAEHOSTUNREACH:
s = "Host unreachable";
break;
default:
s = "Unknown error";
break;
}
sprintf (tmp,"Can't connect to %.80s,%ld: %s (%d)",hst,port,s,
WSAGetLastError ());
tcp_close_socket (&sock); /* flush socket */
sock = INVALID_SOCKET;
}
return sock; /* return the socket */
}
/* TCP/IP authenticated open
* Accepts: NETMBX specifier
* 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; /* always NIL on Windows */
}
/* 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 == INVALID_SOCKET) 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;
struct timeval tmo;
time_t tc,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);
if (tcpdebug) mm_log ("Reading TCP buffer",TCPDEBUG);
FD_ZERO (&fds); /* initialize selection vector */
FD_SET (stream->tcpsi,&fds);/* set bit in selection vector */
tmo.tv_sec = ttmo_read;
tmo.tv_usec = 0;
/* block and read */
switch ((stream->tcpsi == stream->tcpso) ?
select (stream->tcpsi+1,&fds,0,0,
ttmo_read ? &tmo : (struct timeval *) 0) : 1) {
case SOCKET_ERROR: /* error */
if (WSAGetLastError () != WSAEINTR) return tcp_abort (stream);
break;
case 0: /* timeout */
tc = time (0);
if (tmoh && ((*tmoh) (tc - t,tc - tl))) break;
return tcp_abort (stream);
default:
if (stream->tcpsi == stream->tcpso)
while (((i = recv (stream->tcpsi,s,(int) min (maxposint,size),0)) ==
SOCKET_ERROR) && (WSAGetLastError () == WSAEINTR));
else while (((i = read (stream->tcpsi,s,(int) min (maxposint,size))) <
0) && (errno == EINTR));
switch (i) {
case SOCKET_ERROR: /* error */
case 0: /* no data read */
return tcp_abort (stream);
default:
s += i; /* point at new place to write */
size -= i; /* reduce byte count */
if (tcpdebug) mm_log ("Successfully read TCP buffer",TCPDEBUG);
}
}
}
(*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)
{
struct timeval tmo;
int i;
fd_set fds;
time_t tc,t = time (0);
blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
FD_ZERO (&fds); /* initialize selection vector */
if (stream->tcpsi == INVALID_SOCKET) return NIL;
(*bn) (BLOCK_TCPREAD,NIL);
tmo.tv_sec = ttmo_read;
tmo.tv_usec = 0;
while (stream->ictr < 1) { /* if nothing in the buffer */
time_t tl = time (0);
if (tcpdebug) mm_log ("Reading TCP data",TCPDEBUG);
FD_SET (stream->tcpsi,&fds);/* set bit in selection vector */
/* block and read */
switch ((stream->tcpsi == stream->tcpso) ?
select (stream->tcpsi+1,&fds,0,0,
ttmo_read ? &tmo : (struct timeval *) 0) : 1) {
case SOCKET_ERROR: /* error */
if (WSAGetLastError () != WSAEINTR) return tcp_abort (stream);
break;
case 0: /* timeout */
tc = time (0);
if (tmoh && ((*tmoh) (tc - t,tc - tl))) break;
return tcp_abort (stream);
default:
if (stream->tcpsi == stream->tcpso)
while (((i = recv (stream->tcpsi,stream->ibuf,BUFLEN,0)) ==
SOCKET_ERROR) && (WSAGetLastError () == WSAEINTR));
else while (((i = read (stream->tcpsi,stream->ibuf,BUFLEN)) < 0) &&
(errno == EINTR));
switch (i) {
case SOCKET_ERROR: /* error */
case 0: /* no data read */
return tcp_abort (stream);
default:
stream->ictr = i; /* set new byte count */
/* point at TCP buffer */
stream->iptr = stream->ibuf;
if (tcpdebug) mm_log ("Successfully read TCP data",TCPDEBUG);
}
}
}
(*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;
struct timeval tmo;
fd_set fds;
time_t tc,t = time (0);
blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
tmo.tv_sec = ttmo_write;
tmo.tv_usec = 0;
FD_ZERO (&fds); /* initialize selection vector */
if (stream->tcpso == INVALID_SOCKET) return NIL;
(*bn) (BLOCK_TCPWRITE,NIL);
while (size > 0) { /* until request satisfied */
time_t tl = time (0);
if (tcpdebug) mm_log ("Writing to TCP",TCPDEBUG);
FD_SET (stream->tcpso,&fds);/* set bit in selection vector */
/* block and write */
switch ((stream->tcpsi == stream->tcpso) ?
select (stream->tcpso+1,NULL,&fds,NULL,
tmo.tv_sec ? &tmo : (struct timeval *) 0) : 1) {
case SOCKET_ERROR: /* error */
if (WSAGetLastError () != WSAEINTR) return tcp_abort (stream);
break;
case 0: /* timeout */
tc = time (0);
if (tmoh && ((*tmoh) (tc - t,tc - tl))) break;
return tcp_abort (stream);
default:
if (stream->tcpsi == stream->tcpso)
while (((i = send (stream->tcpso,string,
(int) min (size,TCPMAXSEND),0)) == SOCKET_ERROR) &&
(WSAGetLastError () == WSAEINTR));
else while (((i = write (stream->tcpso,string,
min (size,TCPMAXSEND))) < 0) &&
(errno == EINTR));
if (i == SOCKET_ERROR) return tcp_abort (stream);
size -= i; /* count this size */
if (tcpdebug) mm_log ("successfully wrote to TCP",TCPDEBUG);
string += i;
}
}
(*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 sockets */
/* 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 sockets
* Accepts: TCP/IP stream
* Returns: NIL, always
*/
long tcp_abort (TCPSTREAM *stream)
{
if (stream->tcpsi != stream->tcpso) tcp_close_socket (&stream->tcpso);
else stream->tcpso = INVALID_SOCKET;
return tcp_close_socket (&stream->tcpsi);
}
/* TCP/IP abort stream
* Accepts: WinSock socket
* Returns: NIL, always
*/
long tcp_close_socket (SOCKET *sock)
{
blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
/* something to close? */
if (sock && (*sock != INVALID_SOCKET)) {
(*bn) (BLOCK_TCPCLOSE,NIL);
closesocket (*sock); /* WinSock socket close */
*sock = INVALID_SOCKET;
(*bn) (BLOCK_NONE,NIL);
wsa_sock_open--; /* drop this socket */
}
/* no more open streams? */
if (wsa_initted && !wsa_sock_open) {
mm_log ("Winsock cleanup",NIL);
wsa_initted = 0; /* no more sockets, so... */
WSACleanup (); /* free up resources until needed */
}
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,&sinlen) ==
SOCKET_ERROR) || (sinlen <= 0)) ?
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,&sinlen) ==
SOCKET_ERROR) || (sinlen <= 0))) ?
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
*/
char *tcp_clientaddr ()
{
if (!myClientAddr) {
struct sockaddr_in sin;
int sinlen = sizeof (struct sockaddr_in);
myClientAddr = /* get stdin's peer name */
((getpeername (0,(struct sockaddr *) &sin,&sinlen) == SOCKET_ERROR) ||
(sinlen <= 0)) ? cpystr ("UNKNOWN") : cpystr (inet_ntoa (sin.sin_addr));
}
return myClientAddr;
}
/* TCP/IP get client host name (server calls only)
* Returns: client host name
*/
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,&sinlen) == SOCKET_ERROR) ||
(sinlen <= 0)) ? cpystr ("UNKNOWN") : tcp_name (&sin,T);
}
return myClientHost;
}
/* TCP/IP get server host address (server calls only)
* Returns: server host address
*/
char *tcp_serveraddr ()
{
if (!myServerAddr) {
struct sockaddr_in sin;
int sinlen = sizeof (struct sockaddr_in);
myServerAddr = /* get stdin's peer name */
((getsockname (0,(struct sockaddr *) &sin,&sinlen) == SOCKET_ERROR) ||
(sinlen <= 0)) ? cpystr ("UNKNOWN") : cpystr (inet_ntoa (sin.sin_addr));
}
return myServerAddr;
}
/* TCP/IP get server host name (server calls only)
* Returns: server host name
*/
static long myServerPort = -1;
char *tcp_serverhost ()
{
if (!myServerHost) {
struct sockaddr_in sin;
int sinlen = sizeof (struct sockaddr_in);
if (!wsa_initted++) { /* init Windows Sockets */
WSADATA wsock;
if (WSAStartup (WSA_VERSION,&wsock)) {
wsa_initted = 0;
return "random-pc"; /* try again later? */
}
}
/* get stdin's name */
if ((getsockname (0,(struct sockaddr *) &sin,&sinlen) == SOCKET_ERROR) ||
(sinlen <= 0)) 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);
/* look like domain literal? */
if (name[0] == '[' && name[strlen (name) - 1] == ']') return name;
(*bn) (BLOCK_DNSLOOKUP,NIL);
if (tcpdebug) {
sprintf (host,"DNS canonicalization %.80s",name);
mm_log (host,TCPDEBUG);
}
/* note that NT requires lowercase! */
ret = (he = gethostbyname (lcase (strcpy (host,name)))) ? he->h_name : name;
(*bn) (BLOCK_NONE,NIL);
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);
}
/* Return my local host name
* Returns: my local host name
*/
char *mylocalhost (void)
{
if (!myLocalHost) {
char tmp[MAILTMPLEN];
if (!wsa_initted++) { /* init Windows Sockets */
WSADATA wsock;
if (WSAStartup (WSA_VERSION,&wsock)) {
wsa_initted = 0;
return "random-pc"; /* try again later? */
}
}
myLocalHost = cpystr ((gethostname (tmp,MAILTMPLEN-1) == SOCKET_ERROR) ?
"random-pc" : tcp_canonical (tmp));
}
return myLocalHost;
}
/* 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;
}
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