tcp_ami.c
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上传日期:2007-01-04
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- /*
- * 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: 14 June 1999
- *
- * Copyright 1999 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 allowreversedns = /* allow reverse DNS lookup */
- #ifdef DISABLE_REVERSE_DNS_LOOKUP
- NIL /* Not recommended, especially if using Kerberos authentication */
- #else
- T
- #endif
- ;
- /* 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);
- char *tcp_name (struct sockaddr_in *sin,long flag);
- /* 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_ALLOWREVERSEDNS:
- allowreversedns = (long) value;
- break;
- case GET_ALLOWREVERSEDNS:
- value = (void *) allowreversedns;
- break;
- default:
- value = NIL; /* error case */
- break;
- }
- return value;
- }
- /* 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,sock;
- int ctr = 0;
- int silent = (port & 0x80000000) ? T : NIL;
- int *ctrp = &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 &= 0x7fffffff; /* erase silent flag */
- 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 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] = ' ';
- 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,ctrp,hostname,port);
- }
- else {
- sprintf (tmp,"Bad format domain-literal: %.80s",host);
- mm_log (tmp,ERROR);
- return NIL;
- }
- }
- else { /* lookup host name */
- (*bn) (BLOCK_DNSLOOKUP,NIL);
- data = (*bn) (BLOCK_SENSITIVE,NIL);
- /* quell alarms */
- if (he = gethostbyname (lcase (strcpy (hostname,host)))) {
- (*bn) (BLOCK_NONSENSITIVE,data);
- (*bn) (BLOCK_NONE,NIL);
- /* 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_DNSLOOKUP,NIL);
- sock = tcp_socket_open (&sin,tmp,ctrp,hostname,port);
- (*bn) (BLOCK_NONE,NIL);
- #endif
- }
- else {
- (*bn) (BLOCK_NONSENSITIVE,data);
- (*bn) (BLOCK_NONE,NIL);
- sprintf (tmp,"No such host as %.80s",host);
- mm_log (tmp,ERROR);
- return NIL;
- }
- }
- 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);
- }
- 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,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;
- }
- if (!ctr) { /* no open timeout wanted */
- /* open connection */
- while ((i = connect (sock,(struct sockaddr *) sin,
- sizeof (struct sockaddr_in))) < 0 && errno == EINTR);
- if (i < 0) { /* failed? */
- sprintf (tmp,"Can't connect to %.80s,%lu: %s",hst,port,strerror (errno));
- close (sock); /* flush socket */
- return -1;
- }
- }
- else { /* want open timeout */
- /* get current socket flags */
- flgs = fcntl (sock,F_GETFL,0);
- /* set non-blocking */
- 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:
- sprintf (tmp,"Can't connect to %.80s,%lu: %s",hst,port,strerror (errno));
- close (sock); /* flush socket */
- 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,%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
- */
- #define MAXARGV 10
- TCPSTREAM *tcp_aopen (NETMBX *mb,char *service,char *usrbuf)
- {
- return NIL; /* disabled */
- }
- /* 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 = ' ';
- 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 == ' 15') && (d == ' 12')) {
- ret = (char *) fs_get (n--);
- memcpy (ret,st,n); /* copy into a free storage string */
- ret[n] = ' '; /* 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 == ' 15') && (*stream->iptr == ' 12')) {
- stream->iptr++; /* eat the line feed */
- stream->ictr--;
- ret[n - 1] = ' '; /* 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] = ' '; /* 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] = ' '; /* 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 */
- 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 */
- }
- (*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;
- 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 */
- 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;
- }
- (*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) ?
- 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)) ?
- cpystr (mylocalhost ()) : tcp_name (&sin,NIL);
- }
- 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) {
- struct sockaddr_in sin;
- int sinlen = sizeof (struct sockaddr_in);
- /* get stdin's peer name */
- myClientHost = getpeername (0,(struct sockaddr *) &sin,(void *) &sinlen) ?
- cpystr ("UNKNOWN") : tcp_name (&sin,T);
- }
- 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) {
- struct sockaddr_in sin;
- int sinlen = sizeof (struct sockaddr_in);
- /* get stdin's name */
- if (getsockname (0,(struct sockaddr *) &sin,(void *) &sinlen))
- 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);
- data = (*bn) (BLOCK_SENSITIVE,NIL);
- /* note that Amiga requires lowercase! */
- ret = (he = gethostbyname (lcase (strcpy (host,name)))) ? he->h_name : name;
- (*bn) (BLOCK_NONSENSITIVE,data);
- (*bn) (BLOCK_NONE,NIL);
- 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 *s,tmp[MAILTMPLEN];
- if (allowreversedns) {
- struct hostent *he;
- blocknotify_t bn = (blocknotify_t)mail_parameters(NIL,GET_BLOCKNOTIFY,NIL);
- void *data;
- (*bn) (BLOCK_DNSLOOKUP,NIL);
- data = (*bn) (BLOCK_SENSITIVE,NIL);
- /* translate address to name */
- if (!(he = gethostbyaddr ((char *) &sin->sin_addr,
- sizeof (struct in_addr),sin->sin_family)))
- sprintf (s = tmp,"[%s]",inet_ntoa (sin->sin_addr));
- else if (flag) sprintf (s = tmp,"%s [%s]",he->h_name,
- inet_ntoa (sin->sin_addr));
- else s = he->h_name;
- (*bn) (BLOCK_NONSENSITIVE,data);
- (*bn) (BLOCK_NONE,NIL);
- }
- else sprintf (s = tmp,"[%s]",inet_ntoa (sin->sin_addr));
- return cpystr (s);
- }