long tcp_isclienthost (char *host)
{
int family;
size_t adrlen,sadrlen,len;
void *adr,*next;
struct sockaddr *sadr;
long ret = NIL;
/* make sure that myClientAddr is set */
if (tcp_clienthost () && myClientAddr)
/* get sockaddr of client */
for (adr = ip_nametoaddr (host,&adrlen,&family,NIL,&next); adr && !ret;
adr = ip_nametoaddr (NIL,&adrlen,&family,NIL,&next)) {
/* build sockaddr of given address */
sadr = ip_sockaddr (family,adr,adrlen,1,&len);
if (!strcmp (myClientAddr,ip_sockaddrtostring (sadr))) ret = LONGT;
fs_give ((void **) &sadr); /* done with client sockaddr */
}
return ret;
}
char *tcp_canonical (char *name)
{
char *ret,host[MAILTMPLEN];
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);
}
/* get canonical name */
if (!ip_nametoaddr (name,NIL,NIL,&ret,NIL)) ret = name;
(*bn) (BLOCK_NONE,NIL); /* alarms OK now */
if (tcpdebug) mm_log ("DNS canonicalization done",TCPDEBUG);
return ret;
}
TCPSTREAM *tcp_open (char *host,char *service,unsigned long port)
{
TCPSTREAM *stream = NIL;
int family;
int sock = -1;
int ctr = 0;
int silent = (port & NET_SILENT) ? T : NIL;
int *ctrp = (port & NET_NOOPENTIMEOUT) ? NIL : &ctr;
char *s,*hostname,tmp[MAILTMPLEN];
void *adr;
size_t adrlen;
struct servent *sv = NIL;
blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
void *data,*next;
port &= 0xffff; /* erase flags */
/* lookup service */
if (service && (sv = getservbyname (service,"tcp")))
port = ntohs (sv->s_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 (tmp,host+1); /* yes, copy number part */
tmp[(strlen (tmp))-1] = '\0';
if (adr = ip_stringtoaddr (tmp,&adrlen,&family)) {
(*bn) (BLOCK_TCPOPEN,NIL);
/* get an open socket for this system */
sock = tcp_socket_open (family,adr,adrlen,port,tmp,ctrp,hostname = host);
(*bn) (BLOCK_NONE,NIL);
fs_give ((void **) &adr);
}
else sprintf (tmp,"Bad format domain-literal: %.80s",host);
}
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 (!(s = ip_nametoaddr (host,&adrlen,&family,&hostname,&next)))
sprintf (tmp,"No such host as %.80s",host);
(*bn) (BLOCK_NONSENSITIVE,data);
(*bn) (BLOCK_NONE,NIL);
if (s) { /* DNS resolution won? */
if (tcpdebug) mm_log ("DNS resolution done",TCPDEBUG);
do {
(*bn) (BLOCK_TCPOPEN,NIL);
if (((sock = tcp_socket_open (family,s,adrlen,port,tmp,ctrp,
hostname)) < 0) &&
(s = ip_nametoaddr (NIL,&adrlen,&family,&hostname,&next)) &&
!silent) mm_log (tmp,WARN);
(*bn) (BLOCK_NONE,NIL);
} while ((sock < 0) && s);/* repeat until success or no more addreses */
}
}
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 */
}
TCPSTREAM *tcp_open (char *host,char *service,unsigned long port)
{
TCPSTREAM *stream = NIL;
int i,family;
SOCKET sock = INVALID_SOCKET;
int silent = (port & NET_SILENT) ? T : NIL;
char *s,*hostname,tmp[MAILTMPLEN];
void *adr,*next;
size_t adrlen;
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 (WINSOCK_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 (sv->s_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. */
/* 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 (adr = ip_stringtoaddr (tmp,&adrlen,&family)) {
(*bn) (BLOCK_TCPOPEN,NIL);
sock = tcp_socket_open (family,adr,adrlen,(unsigned short) port,tmp,
hostname = host);
(*bn) (BLOCK_NONE,NIL);
fs_give ((void **) &adr);
}
else sprintf (tmp,"Bad format domain-literal: %.80s",host);
}
else { /* lookup host name */
if (tcpdebug) {
sprintf (tmp,"DNS resolution %.80s",host);
mm_log (tmp,TCPDEBUG);
}
(*bn) (BLOCK_DNSLOOKUP,NIL);/* look up name */
if (!(s = ip_nametoaddr (host,&adrlen,&family,&hostname,&next)))
sprintf (tmp,"Host not found (#%d): %s",WSAGetLastError (),host);
(*bn) (BLOCK_NONE,NIL);
if (s) { /* DNS resolution won? */
if (tcpdebug) mm_log ("DNS resolution done",TCPDEBUG);
wsa_sock_open++; /* prevent tcp_abort() from freeing in loop */
do {
(*bn) (BLOCK_TCPOPEN,NIL);
if (((sock = tcp_socket_open (family,s,adrlen,(unsigned short) port,
tmp,hostname)) == INVALID_SOCKET) &&
(s = ip_nametoaddr (NIL,&adrlen,&family,&hostname,&next)) &&
!silent) mm_log (tmp,WARN);
(*bn) (BLOCK_NONE,NIL);
} while ((sock == INVALID_SOCKET) && s);
wsa_sock_open--; /* undo protection */
}
}
if (sock == INVALID_SOCKET) { /* do possible cleanup action */
if (!silent) mm_log (tmp,ERROR);
tcp_abort (&sock);
}
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 */
}