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path: root/imap/src/osdep/dos/tcp_wsk.c
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-rw-r--r--imap/src/osdep/dos/tcp_wsk.c818
1 files changed, 818 insertions, 0 deletions
diff --git a/imap/src/osdep/dos/tcp_wsk.c b/imap/src/osdep/dos/tcp_wsk.c
new file mode 100644
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+++ b/imap/src/osdep/dos/tcp_wsk.c
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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;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.44.0) at 2024-07-12 19:35:58 +0000