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- /*
- * Program: Operating-system dependent routines -- MS-DOS (PC/TCP) version
- *
- * Author: Mark Crispin/Ken Bobey
- * 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: 15 June 1993
- *
- * Copyright 1993 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.
- *
- */
-
- /* TCP input buffer -- must be large enough to prevent overflow */
-
- #define BUFLEN 8192
-
-
- /* TCP I/O stream (must be before osdep.h is included) */
-
- #define TCPSTREAM struct tcp_stream
- TCPSTREAM {
- char *host; /* host name */
- char *localhost; /* local host name */
- int tcps; /* tcp socket */
- long ictr; /* input counter */
- char *iptr; /* input pointer */
- char ibuf[BUFLEN]; /* input buffer */
- };
-
-
- /* Private function prototypes */
-
- #include "mail.h"
- #include "osdep.h"
- #include <time.h>
- #include <sys\timeb.h>
- #include <4bsddefs.h>
- #include <sys\socket.h>
- #include <errno.h>
- #include <netinet\in.h>
- #include <netdb.h>
- #include "misc.h"
-
-
- /* Global data */
-
- unsigned long rndm = 0xfeed; /* initial `random' number */
-
- /* Write current time in RFC 822 format
- * Accepts: destination string
- */
-
- char *days[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
-
- void rfc822_date (char *date)
- {
- time_t ti = time (0);
- struct tm *t;
- tzset (); /* initialize timezone stuff */
- t = localtime (&ti); /* output local time */
- sprintf (date,"%s, %d %s %d %02d:%02d:%02d %s",
- days[t->tm_wday],t->tm_mday,months[t->tm_mon],t->tm_year+1900,
- t->tm_hour,t->tm_min,t->tm_sec,tzname[t->tm_isdst]);
- }
-
- /* Get a block of free storage
- * Accepts: size of desired block
- * Returns: free storage block
- */
-
- void *fs_get (size_t size)
- {
- void *block = malloc (size);
- if (!block) fatal ("Out of free storage");
- return (block);
- }
-
-
- /* Resize a block of free storage
- * Accepts: ** pointer to current block
- * new size
- */
-
- void fs_resize (void **block,size_t size)
- {
- if (!(*block = realloc (*block,size))) fatal ("Can't resize free storage");
- }
-
-
- /* Return a block of free storage
- * Accepts: ** pointer to free storage block
- */
-
- void fs_give (void **block)
- {
- free (*block);
- *block = NIL;
- }
-
-
- /* Report a fatal error
- * Accepts: string to output
- */
-
- void fatal (char *string)
- {
- mm_fatal (string); /* pass the string */
- abort (); /* die horribly */
- }
-
- /* Copy string with CRLF newlines
- * Accepts: destination string
- * pointer to size of destination string
- * source string
- * length of source string
- */
-
- char *strcrlfcpy (char **dst,unsigned long *dstl,char *src,unsigned long srcl)
- {
- if (srcl > *dstl) { /* resize if not enough space */
- fs_give ((void **) dst); /* fs_resize does an unnecessary copy */
- *dst = (char *) fs_get ((*dstl = srcl) + 1);
- }
- /* copy strings */
- if (srcl) memcpy (*dst,src,srcl);
- *(*dst + srcl) = '\0'; /* tie off destination */
- return *dst; /* return destination */
- }
-
-
- /* Length of string after strcrlfcpy applied
- * Accepts: source string
- * length of source string
- */
-
- unsigned long strcrlflen (STRING *s)
- {
- return SIZE (s); /* no-brainer on DOS! */
- }
-
-
- /* Return my home directory name
- * Returns: my home directory name
- */
-
- char *hdname = NIL;
-
- char *myhomedir ()
- {
- int i;
- char *s;
- if (!hdname) { /* get home directory name if not yet known */
- hdname = cpystr ((s = getenv ("HOME")) ? s : "");
- if ((i = strlen (hdname)) && ((hdname[i-1] == '\\') || (hdname[i-1]=='/')))
- hdname[i-1] = '\0'; /* tie off trailing directory delimiter */
- }
- return hdname;
- }
-
- /* TCP/IP open
- * Accepts: host name
- * contact port number
- * Returns: TCP/IP stream if success else NIL
- */
-
- TCPSTREAM *tcp_open (char *host,long port)
- {
- TCPSTREAM *stream = NIL;
- struct sockaddr_in sin;
- struct hostent *host_name;
- int sock;
- long adr,i,j,k,l;
- char *s;
- char tmp[MAILTMPLEN];
- char *hostname = cpystr (host);
- /* set default gets routine */
- if (!mailgets) mailgets = mm_gets;
- /* 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. */
- 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)) == -1) {
- sprintf (tmp,"Bad format domain-literal: %.80s",host);
- mm_log (tmp,ERROR);
- fs_give ((void **) hostname);
- return NIL;
- }
- }
- else { /* lookup host name */
- if ((host_name = gethostbyname (lcase (hostname)))) {
- /* copy host name */
- strcpy (hostname,host_name->h_name);
- /* copy host addresses */
- memcpy (&sin.sin_addr,host_name->h_addr,host_name->h_length);
- }
- else {
- sprintf (tmp,"Host not found: %s",host);
- mm_log (tmp,ERROR);
- fs_give ((void **) hostname);
- return NIL;
- }
- }
-
- /* copy port number in network format */
- if (!(sin.sin_port = htons (port))) fatal ("Bad port argument to tcp_open");
- /* get a TCP stream */
- if ((sock = socket (sin.sin_family,SOCK_STREAM,0)) < 0) {
- sprintf (tmp,"Unable to create TCP socket (%d)",errno);
- mm_log (tmp,ERROR);
- fs_give ((void **) hostname);
- return NIL;
- }
- /* open connection */
- if (connect (sock,(struct sockaddr *) &sin,sizeof (sin)) < 0) {
- switch (errno) { /* analyze error */
- case ECONNREFUSED: s = "Refused"; break;
- case ENOBUFS: s = "Insufficient system resources"; break;
- case ETIMEDOUT: s = "Timed out"; break;
- default: s = "Unknown error"; break;
- }
- sprintf (tmp,"Can't connect to %.80s,%ld: %s (%d)",hostname,port,s,errno);
- mm_log (tmp,ERROR);
- fs_give ((void **) hostname);
- close (sock);
- return NIL;
- }
- /* create TCP/IP stream */
- stream = (TCPSTREAM *) fs_get (sizeof (TCPSTREAM));
- stream->host = hostname; /* official host name */
- if (adr = gethostid ()) { /* get local IP address */
- i = adr >> 24; j = (adr >> 16) & 0xff; k = (adr >> 8) & 0xff;
- l = adr & 0xff;
- sprintf (tmp,"[%ld.%ld.%ld.%ld]",i,j,k,l);
- stream->localhost = cpystr (tmp);
- }
- else stream->localhost = cpystr ("random-pc");
- stream->tcps = sock; /* init socket */
- stream->ictr = 0; /* init input counter */
- return stream; /* return success */
- }
-
- /* TCP/IP authenticated open
- * Accepts: host name
- * service name
- * Returns: TCP/IP stream if success else NIL
- */
-
- TCPSTREAM *tcp_aopen (char *host,char *service)
- {
- return NIL; /* always NIL on DOS */
- }
-
- /* 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)) return NIL;
- /* special case of newline broken by buffer */
- 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)
- {
- fd_set fds;
- FD_ZERO (&fds); /* initialize selection vector */
- if (stream->tcps < 0) return NIL;
- while (stream->ictr < 1) { /* if nothing in the buffer */
- FD_SET (stream->tcps,&fds); /* set bit in selection vector */
- /* block and read */
- if ((select (stream->tcps+1,&fds,0,0,0) < 0) ||
- ((stream->ictr = read (stream->tcps,stream->ibuf,BUFLEN)) < 1)) {
- close (stream->tcps); /* nuke the socket */
- stream->tcps = -1;
- return NIL;
- }
- stream->iptr = stream->ibuf;/* point at TCP buffer */
- }
- 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)
- {
- long i;
- fd_set fds;
- FD_ZERO (&fds); /* initialize selection vector */
- if (stream->tcps < 0) return NIL;
- while (size > 0) { /* until request satisfied */
- FD_SET (stream->tcps,&fds);/* set bit in selection vector */
- if ((select (stream->tcps+1,0,&fds,0,0) < 0) ||
- ((i = write (stream->tcps,string,size)) < 0)) {
- close (stream->tcps); /* nuke the socket */
- stream->tcps = -1;
- return NIL;
- }
- size -= i; /* count this size */
- string += i;
- }
- return T; /* all done */
- }
-
-
- /* TCP/IP close
- * Accepts: TCP/IP stream
- */
-
- void tcp_close (TCPSTREAM *stream)
- {
- /* nuke the socket */
- if (stream->tcps >= 0) close (stream->tcps);
- stream->tcps = -1;
- /* flush host names */
- fs_give ((void **) &stream->host);
- fs_give ((void **) &stream->localhost);
- fs_give ((void **) &stream); /* flush the stream */
- }
-
- /* TCP/IP get host name
- * Accepts: TCP/IP stream
- * Returns: host name for this stream
- */
-
- char *tcp_host (TCPSTREAM *stream)
- {
- return stream->host; /* return host name */
- }
-
-
- /* TCP/IP get local host name
- * Accepts: TCP/IP stream
- * Returns: local host name
- */
-
- char *tcp_localhost (TCPSTREAM *stream)
- {
- return stream->localhost; /* return local host name */
- }
-
- /* These functions are only used by rfc822.c for calculating cookies. So this
- * is good enough. If anything better is needed fancier functions will be
- * needed.
- */
-
-
- /* Return random number
- */
-
- long random ()
- {
- return rndm *= 0xdae0;
- }
-
-
- /* Return `process ID'
- */
-
- long getpid ()
- {
- return 1;
- }
-