🚀 go-pugleaf

In GNU Emacs 19.25.2 of Fri Aug 12 1994 on gza-client1 (sparc-sun-sunos4.1.3)

The shar file at the end of this message contains two diff files,
Makefile.in.in-diff and movemail.c-diff, to be applied as patches in
the lib-src directory, as well as three new files, pop.c, pop.h and
strstr.c, to be added to the lib-src directory.

The two major enhancements in these improvements to movemail are (1)
better POP code which has been ripped out of movemail.c and moved into
a separate module, and (2) better error checking for failures to save
mail to the output file.

If this version of movemail is incorporated into the standard GNU
Emacs release, I will maintain it.

Jonathan Kamens  |  OpenVision Technologies, Inc.  |   jik@cam.ov.com

#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#		"End of shell archive."
# Contents:  Makefile.in.in-diff movemail.c-diff pop.c pop.h strstr.c
# Wrapped by jik@gza-client1 on Sun Aug 14 00:01:42 1994
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'Makefile.in.in-diff' -a "${1}" != "-c" ; then 
  echo shar: Will not clobber existing file \"'Makefile.in.in-diff'\"
else
echo shar: Extracting \"'Makefile.in.in-diff'\" \(2496 characters\)
sed "s/^X//" >'Makefile.in.in-diff' <<'END_OF_FILE'
X*** Makefile.in.in	1994/08/11 20:41:33	1.1.1.1
X--- Makefile.in.in	1994/08/11 21:43:53	1.5.1.1
X***************
X*** 101,106 ****
X--- 101,135 ----
X  SOURCES = COPYING ChangeLog Makefile.in README aixcc.lex emacs.csh \
X  	makedoc.com *.[chy] rcs2log vcdiff
X  
X+ # Additional -D flags for movemail (add to MOVE_FLAGS if desired):
X+ # MAIL_USE_POP		Support mail retrieval from a POP mailbox.
X+ # MAIL_USE_MMDF		Support MMDF mailboxes.
X+ # MAIL_USE_FLOCK	Use flock() for file locking (see the comments
X+ #			about locking in movemail.c)
X+ # MAIL_UNLINK_SPOOL	Unlink the user's spool mailbox after reading
X+ #			it (instead of just emptying it).
X+ # KERBEROS		Support Kerberized POP.
X+ # KRB5			Support Kerberos Version 5 pop instead of
X+ #			Version 4 (define this in addition to
X+ #			KERBEROS).
X+ # HESIOD		Support Hesiod lookups of user mailboxes.
X+ # LOCAL_STRSTR		Need to provide strstr(), since it isn't in
X+ #			the standard C library
X+ # MAILHOST		A string, the host name of the default POP
X+ #			mail host for the site.
X+ MOVE_FLAGS=
X+ 
X+ # Additional libraries for movemail:
X+ # For KERBEROS
X+ # MOVE_LIBS= -lkrb -ldes -lcom_err
X+ # For KERBEROS + KRB5
X+ # MOVE_LIBS= -lkrb5 -lcrypto -lisode -lcom_err
X+ # Add "-lhesiod" if HESIOD is defined.
X+ MOVE_LIBS=
X+ 
X+ MOVE_SOURCES = ${srcdir}/movemail.c ${srcdir}/pop.c ${srcdir}/strstr.c
X+ MOVE_OBJS    = movemail.o pop.o strstr.o
X+ 
X  # ========================== start of cpp stuff =======================
X  /* From here on, comments must be done in C syntax.  */
X  
X***************
X*** 284,291 ****
X  b2m: ${srcdir}/b2m.c ../src/config.h
X  	$(CC) ${ALL_CFLAGS} ${srcdir}/b2m.c $(LOADLIBES) -o b2m 
X  
X! movemail: ${srcdir}/movemail.c ../src/config.h
X! 	$(CC) ${ALL_CFLAGS} ${srcdir}/movemail.c $(LOADLIBES) -o movemail
X  
X  cvtmail: ${srcdir}/cvtmail.c
X  	$(CC) ${ALL_CFLAGS} ${srcdir}/cvtmail.c $(LOADLIBES) -o cvtmail
X--- 313,329 ----
X  b2m: ${srcdir}/b2m.c ../src/config.h
X  	$(CC) ${ALL_CFLAGS} ${srcdir}/b2m.c $(LOADLIBES) -o b2m 
X  
X! movemail: ${MOVE_OBJS}
X! 	$(CC) ${LINK_CFLAGS} ${MOVE_FLAGS} ${MOVE_OBJS} $(LOADLIBES) $(MOVE_LIBS) -o movemail
X! 
X! movemail.o: ${srcdir}/movemail.c ../src/config.h
X! 	$(CC) -c ${CPP_CFLAGS} ${MOVE_FLAGS} ${srcdir}/movemail.c
X! 
X! pop.o: ${srcdir}/pop.c
X! 	$(CC) -c ${CPP_CFLAGS} ${MOVE_FLAGS} ${srcdir}/pop.c
X! 
X! strstr.o: ${srcdir}/strstr.c
X! 	$(CC) -c ${CPP_CFLAGS} ${MOVE_FLAGS} ${srcdir}/strstr.c
X  
X  cvtmail: ${srcdir}/cvtmail.c
X  	$(CC) ${ALL_CFLAGS} ${srcdir}/cvtmail.c $(LOADLIBES) -o cvtmail
END_OF_FILE
if test 2496 -ne `wc -c <'Makefile.in.in-diff'`; then
    echo shar: \"'Makefile.in.in-diff'\" unpacked with wrong size!
fi
# end of 'Makefile.in.in-diff'
fi
if test -f 'movemail.c-diff' -a "${1}" != "-c" ; then 
  echo shar: Will not clobber existing file \"'movemail.c-diff'\"
else
echo shar: Extracting \"'movemail.c-diff'\" \(11173 characters\)
sed "s/^X//" >'movemail.c-diff' <<'END_OF_FILE'
X*** movemail.c	1994/08/11 20:57:36	1.1.1.3
X--- movemail.c	1994/08/11 21:03:39	1.7
X***************
X*** 46,51 ****
X--- 46,56 ----
X   * New routines in movemail.c:
X   *	get_errmsg - return pointer to system error message
X   *
X+  * Modified August, 1993 by Jonathan Kamens (OpenVision Technologies)
X+  *
X+  * Move all of the POP code into a separate file, "pop.c".
X+  * Use strerror instead of get_errmsg.
X+  *
X   */
X  
X  #include <sys/types.h>
X***************
X*** 55,60 ****
X--- 60,68 ----
X  #define NO_SHORTNAMES   /* Tell config not to load remap.h */
X  #include <../src/config.h>
X  #include <../src/syswait.h>
X+ #ifdef MAIL_USE_POP
X+ #include "pop.h"
X+ #endif
X  
X  #ifdef MSDOS
X  #undef access
X***************
X*** 445,790 ****
X  char *progname;
X  FILE *sfi;
X  FILE *sfo;
X  char Errmsg[80];
X  
X! static int debug = 0;
X! 
X! char *get_errmsg ();
X! char *getenv ();
X! int mbx_write ();
X! 
X! popmail (user, outfile)
X!      char *user;
X!      char *outfile;
X  {
X-   char *host;
X    int nmsgs, nbytes;
X-   char response[128];
X    register int i;
X    int mbfi;
X    FILE *mbf;
X!   struct passwd *pw = (struct passwd *) getpwuid (getuid ());
X!   if (pw == NULL)
X!     fatal ("cannot determine user name");
X! 
X!   host = getenv ("MAILHOST");
X!   if (host == NULL)
X!     {
X!       fatal ("no MAILHOST defined");
X!     }
X! 
X!   if (pop_init (host) == NOTOK)
X!     {
X!       fatal (Errmsg);
X!     }
X! 
X!   if (getline (response, sizeof response, sfi) != OK)
X!     {
X!       fatal (response);
X!     }
X! 
X!   if (pop_command ("USER %s", user) == NOTOK
X!       || pop_command ("RPOP %s", pw->pw_name) == NOTOK)
X!     {
X!       pop_command ("QUIT");
X!       fatal (Errmsg);
X!     }
X  
X!   if (pop_stat (&nmsgs, &nbytes) == NOTOK)
X!     {
X!       pop_command ("QUIT");
X!       fatal (Errmsg);
X!     }
X  
X    if (!nmsgs)
X!     {
X!       pop_command ("QUIT");
X!       return 0;
X!     }
X  
X    mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666);
X    if (mbfi < 0)
X-     {
X-       pop_command ("QUIT");
X-       pfatal_and_delete (outfile);
X-     }
X-   fchown (mbfi, getuid (), -1);
X- 
X-   if ((mbf = fdopen (mbfi, "w")) == NULL)
X-     {
X-       pop_command ("QUIT");
X-       pfatal_and_delete (outfile);
X-     }
X- 
X-   for (i = 1; i <= nmsgs; i++)
X-     {
X-       mbx_delimit_begin (mbf);
X-       if (pop_retr (i, mbx_write, mbf) != OK)
X- 	{
X- 	  pop_command ("QUIT");
X- 	  close (mbfi);
X- 	  unlink (outfile);
X- 	  fatal (Errmsg);
X- 	}
X-       mbx_delimit_end (mbf);
X-       fflush (mbf);
X-     }
X- 
X-   if (fsync (mbfi) < 0)
X-     {
X-       pop_command ("QUIT");
X-       pfatal_and_delete (outfile);
X-     }
X- 
X-   if (close (mbfi) == -1)
X-     {
X-       pop_command ("QUIT");
X-       pfatal_and_delete (outfile);
X-     }
X- 
X-   for (i = 1; i <= nmsgs; i++)
X-     {
X-       if (pop_command ("DELE %d", i) == NOTOK)
X- 	{
X- 	  /* Better to ignore this failure.  */
X- 	}
X-     }
X- 
X-   pop_command ("QUIT");
X-   return (0);
X- }
X- 
X- pop_init (host)
X-      char *host;
X  {
X!   register struct hostent *hp;
X!   register struct servent *sp;
X!   int lport = IPPORT_RESERVED - 1;
X!   struct sockaddr_in sin;
X!   register int s;
X! 
X!   hp = gethostbyname (host);
X!   if (hp == NULL)
X!     {
X!       sprintf (Errmsg, "MAILHOST unknown: %s", host);
X!       return NOTOK;
X!     }
X! 
X!   sp = getservbyname ("pop", "tcp");
X!   if (sp == 0)
X!     {
X!       strcpy (Errmsg, "tcp/pop: unknown service");
X!       return NOTOK;
X!     }
X! 
X!   sin.sin_family = hp->h_addrtype;
X!   bcopy (hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
X!   sin.sin_port = sp->s_port;
X!   s = rresvport (&lport);
X!   if (s < 0)
X!     {
X!       sprintf (Errmsg, "error creating socket: %s", get_errmsg ());
X!       return NOTOK;
X!     }
X! 
X!   if (connect (s, (char *)&sin, sizeof sin) < 0)
X!     {
X!       sprintf (Errmsg, "error during connect: %s", get_errmsg ());
X!       close (s);
X!       return NOTOK;
X!     }
X! 
X!   sfi = fdopen (s, "r");
X!   sfo = fdopen (s, "w");
X!   if (sfi == NULL || sfo == NULL)
X!     {
X!       sprintf (Errmsg, "error in fdopen: %s", get_errmsg ());
X!       close (s);
X!       return NOTOK;
X      }
X! 
X!   return OK;
X! }
X! 
X! pop_command (fmt, a, b, c, d)
X!      char *fmt;
X! {
X!   char buf[128];
X!   char errmsg[64];
X! 
X!   sprintf (buf, fmt, a, b, c, d);
X  
X!   if (debug) fprintf (stderr, "---> %s\n", buf);
X!   if (putline (buf, Errmsg, sfo) == NOTOK) return NOTOK;
X  
X!   if (getline (buf, sizeof buf, sfi) != OK)
X!     {
X!       strcpy (Errmsg, buf);
X!       return NOTOK;
X!     }
X  
X!   if (debug)
X!     fprintf (stderr, "<--- %s\n", buf);
X!   if (*buf != '+')
X!     {
X!       strcpy (Errmsg, buf);
X!       return NOTOK;
X      }
X!   else
X!     {
X!       return OK;
X!     }
X! }
X  
X      
X! pop_stat (nmsgs, nbytes)
X!      int *nmsgs, *nbytes;
X! {
X!   char buf[128];
X! 
X!   if (debug)
X!     fprintf (stderr, "---> STAT\n");
X!   if (putline ("STAT", Errmsg, sfo) == NOTOK)
X!     return NOTOK;
X! 
X!   if (getline (buf, sizeof buf, sfi) != OK)
X!     {
X!       strcpy (Errmsg, buf);
X!       return NOTOK;
X!     }
X! 
X!   if (debug) fprintf (stderr, "<--- %s\n", buf);
X!   if (*buf != '+')
X!     {
X!       strcpy (Errmsg, buf);
X!       return NOTOK;
X!     }
X!   else
X!     {
X!       sscanf (buf, "+OK %d %d", nmsgs, nbytes);
X!       return OK;
X!     }
X! }
X! 
X! pop_retr (msgno, action, arg)
X!      int (*action)();
X! {
X!   char buf[128];
X! 
X!   sprintf (buf, "RETR %d", msgno);
X!   if (debug) fprintf (stderr, "%s\n", buf);
X!   if (putline (buf, Errmsg, sfo) == NOTOK) return NOTOK;
X! 
X!   if (getline (buf, sizeof buf, sfi) != OK)
X!     {
X!       strcpy (Errmsg, buf);
X!       return NOTOK;
X!     }
X! 
X!   while (1)
X!     {
X!       switch (multiline (buf, sizeof buf, sfi))
X! 	{
X! 	case OK:
X! 	  (*action)(buf, arg);
X! 	  break;
X! 	case DONE:
X! 	  return OK;
X! 	case NOTOK:
X! 	  strcpy (Errmsg, buf);
X! 	  return NOTOK;
X! 	}
X!     }
X! }
X! 
X! getline (buf, n, f)
X!      char *buf;
X!      register int n;
X!      FILE *f;
X! {
X!   register char *p;
X!   int c;
X! 
X!   p = buf;
X!   while (--n > 0 && (c = fgetc (f)) != EOF)
X!     if ((*p++ = c) == '\n') break;
X! 
X!   if (ferror (f))
X!     {
X!       strcpy (buf, "error on connection");
X!       return NOTOK;
X!     }
X! 
X!   if (c == EOF && p == buf)
X!     {
X!       strcpy (buf, "connection closed by foreign host");
X!       return DONE;
X!     }
X! 
X!   *p = NULL;
X!   if (*--p == '\n') *p = NULL;
X!   if (*--p == '\r') *p = NULL;
X!   return OK;
X! }
X! 
X! multiline (buf, n, f)
X!      char *buf;
X!      register int n;
X!      FILE *f;
X! {
X!   if (getline (buf, n, f) != OK)
X!     return NOTOK;
X!   if (*buf == '.')
X!     {
X!       if (*(buf+1) == NULL)
X! 	return DONE;
X!       else
X! 	strcpy (buf, buf+1);
X!     }
X!   return OK;
X  }
X  
X! char *
X! get_errmsg ()
X  {
X!   extern int errno;
X!   extern char *strerror ();
X!   return strerror (errno);
X! }
X  
X! putline (buf, err, f)
X!      char *buf;
X!      char *err;
X!      FILE *f;
X! {
X!   fprintf (f, "%s\r\n", buf);
X!   fflush (f);
X!   if (ferror (f))
X!     {
X!       strcpy (err, "lost connection");
X!       return NOTOK;
X!     }
X!   return OK;
X! }
X  
X! mbx_write (line, mbf)
X!      char *line;
X!      FILE *mbf;
X! {
X!   fputs (line, mbf);
X!   fputc (0x0a, mbf);
X  }
X  
X! mbx_delimit_begin (mbf)
X!      FILE *mbf;
X  {
X!   fputs ("\f\n0, unseen,,\n", mbf);
X  }
X  
X! mbx_delimit_end (mbf)
X!      FILE *mbf;
X  {
X!   putc ('\037', mbf);
X  }
X  
X  #endif /* MAIL_USE_POP */
X--- 453,629 ----
X  char *progname;
X  FILE *sfi;
X  FILE *sfo;
X+ char ibuffer[BUFSIZ];
X+ char obuffer[BUFSIZ];
X  char Errmsg[80];
X  
X! popmail(user, outfile)
X! char *user;
X! char *outfile;
X  {
X    int nmsgs, nbytes;
X    register int i;
X    int mbfi;
X    FILE *mbf;
X!   char *getenv();
X!   int mbx_write();
X!   PopServer server;
X!   extern char *strerror();
X! 
X!   server = pop_open(0, user, 0, POP_NO_GETPASS);
X!   if (! server) {
X!     error(pop_error);
X!     return(1);
X!   }
X  
X!   if (pop_stat(server, &nmsgs, &nbytes)) {
X!     error(pop_error);
X!     return(1);
X!   }
X  
X    if (!nmsgs)
X! {
X!   pop_close(server);
X!   return(0);
X! }
X  
X    mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666);
X    if (mbfi < 0)
X  {
X!   pop_close(server);
X!   error("Error in open: %s, %s", strerror(errno), outfile);
X!   return(1);
X! }
X!   fchown(mbfi, getuid(), -1);
X! 
X!   if ((mbf = fdopen(mbfi, "w")) == NULL)
X! {
X!   pop_close(server);
X!   error("Error in fdopen: %s", strerror(errno));
X!   close(mbfi);
X!   (void) unlink(outfile);
X!   return(1);
X! }
X! 
X!   for (i = 1; i <= nmsgs; i++) {
X!     mbx_delimit_begin(mbf);
X!     if (pop_retr(server, i, mbx_write, mbf) != OK) {
X!       error(Errmsg);
X!       close(mbfi);
X!       return(1);
X!     }
X!     mbx_delimit_end(mbf);
X!     fflush(mbf);
X!     if (ferror(mbf)) {
X!       error("Error in fflush: %s", strerror(errno));
X!       pop_close(server);
X!       close(mbfi);
X!       return(1);
X      }
X!   }
X  
X!   /* On AFS, a call to write() only modifies the file in the local
X!    *     workstation's AFS cache.  The changes are not written to the server
X!    *      until a call to fsync() or close() is made.  Users with AFS home
X!    *      directories have lost mail when over quota because these checks were
X!    *      not made in previous versions of movemail. */
X! 
X!   if (fsync(mbfi) < 0) {
X!     error("Error in fsync: %s", strerror(errno));
X!     return(1);
X!   }
X  
X!   if (close(mbfi) == -1) {
X!     error("Error in close: %s", strerror(errno));
X!     return(1);
X!   }
X  
X!   for (i = 1; i <= nmsgs; i++) {
X!     if (pop_delete(server, i)) {
X!       error(pop_error);
X!       pop_close(server);
X!       return(1);
X      }
X!   }
X  
X+   if (pop_quit(server)) {
X+     error(pop_error);
X+     return(1);
X+   }
X      
X!   return(0);
X  }
X  
X! pop_retr(server, msgno, action, arg)
X! PopServer server;
X! int (*action)();
X  {
X!      extern char *strerror();
X!      char *line;
X!      int ret;
X  
X!      if (pop_retrieve_first(server, msgno, &line)) {
X! 	  strncpy(Errmsg, pop_error, sizeof(Errmsg));
X! 	  Errmsg[sizeof(Errmsg)-1] = '\0';
X! 	  return(NOTOK);
X!      }
X! 
X!      while (! (ret = pop_retrieve_next(server, &line))) {
X! 	  if (! line) {
X! 	       break;
X! 	  }
X! 	  if ((*action)(line, arg) != OK) {
X! 	       strcpy(Errmsg, strerror(errno));
X! 	       pop_close(server);
X! 	       return (NOTOK);
X! 	  }
X!      }
X  
X!      if (ret) {
X! 	  strncpy(Errmsg, pop_error, sizeof(Errmsg));
X! 	  Errmsg[sizeof(Errmsg)-1] = '\0';
X! 	  return(NOTOK);
X!      }
X! 
X!      return(OK);
X! }
X! 
X! /* Do this as a macro instead of using strcmp to save on execution time. */
X! #define IS_FROM_LINE(a) ((a[0] == 'F') && \
X! 			 (a[1] == 'r') && \
X! 			 (a[2] == 'o') && \
X! 			 (a[3] == 'm') && \
X! 			 (a[4] == ' '))
X! 
X! int mbx_write(line, mbf)
X! char *line;
X! FILE *mbf;
X! {
X!   if (IS_FROM_LINE(line)) {
X!     if (fputc('>', mbf) == EOF)
X!       return(NOTOK);
X!   }
X!   if (fputs(line, mbf) == EOF) 
X!     return(NOTOK);
X!   if (fputc(0x0a, mbf) == EOF)
X!     return(NOTOK);
X!   return(OK);
X  }
X  
X! int mbx_delimit_begin(mbf)
X! FILE *mbf;
X  {
X!   if (fputs("\f\n0, unseen,,\n", mbf) == EOF)
X!     return(NOTOK);
X!   return(OK);
X  }
X  
X! mbx_delimit_end(mbf)
X! FILE *mbf;
X  {
X!   if (putc('\037', mbf) == EOF)
X!     return(NOTOK);
X!   return(OK);
X  }
X  
X  #endif /* MAIL_USE_POP */
END_OF_FILE
if test 11173 -ne `wc -c <'movemail.c-diff'`; then
    echo shar: \"'movemail.c-diff'\" unpacked with wrong size!
fi
# end of 'movemail.c-diff'
fi
if test -f 'pop.c' -a "${1}" != "-c" ; then 
  echo shar: Will not clobber existing file \"'pop.c'\"
else
echo shar: Extracting \"'pop.c'\" \(31552 characters\)
sed "s/^X//" >'pop.c' <<'END_OF_FILE'
X/*
X * pop.c: client routines for talking to a POP3-protocol post-office
X * server
X *
X * Copyright (c) 1991,1993 by Jonathan Kamens.
X *
X * Distribution and use of this file is governed by the GNU Public
X * License (version 1 or any later version).
X *
X * If you make any enhancements, bug fixes or porting changes to this
X * file, please make sure that they get sent to me so that I can
X * incorporate them into my master version of it.  Try sending me
X * E-mail at jik@security.ov.com, or, if that fails, at
X * jik@athena.mit.edu.
X *
X * The current version of this file is $Revision: 1.2 $.
X */
X
X#ifdef MAIL_USE_POP
X
X#include <sys/types.h>
X#include <netinet/in.h>
X#include <sys/socket.h>
X#include <pop.h>
X#ifdef sun
X#include <malloc.h>
X#else
Xextern char *malloc(/* unsigned */);
Xextern char *realloc(/* char *, unsigned */);
Xextern void free(/* char * */);
X#endif
X#endif
X#ifdef HESIOD
X#include <hesiod.h>
X/*
X * It really shouldn't be necessary to put this declaration here, but
X * the version of hesiod.h that Athena has installed in release 7.2
X * doesn't declare this function; I don't know if the 7.3 version of
X * hesiod.h does.
X */
Xextern struct servent *hes_getservbyname(/* char *, char * */);
X#endif
X#include <pwd.h>
X#include <string.h>
X#include <strings.h>
X#ifdef LOCAL_STRSTR
Xextern char *strstr(/* char *, char * */);
X#endif
X#include <netdb.h>
X#include <errno.h>
X#include <stdio.h>
X#ifdef KERBEROS
X#ifndef KRB5
X#include <krb.h>
X#include <des.h>
X#else /* KRB5 */
X#include <krb5/krb5.h>
X#include <krb5/ext-proto.h>
X#include <ctype.h>
X#endif /* KRB5 */
X
Xextern char *getenv(/* char * */);
Xextern char *getlogin(/* void */);
Xextern char *getpass(/* char * */);
Xextern int getuid(/* void */);
X#ifndef bzero
Xextern void bzero(/* char *, int */);
X#endif
X#ifndef bcopy
Xbcopy(/* char *, char *, int */);
X#endif
Xextern int socket(/* int, int, int */);
Xextern int connect(/* int, struct sockaddr *, int */);
Xextern char *strerror(/* int */);
Xextern int close(/* int */);
Xextern int read(/* int, char *, int */), write(/* int, char *, int */);
Xextern int atoi(/* char * */);
X#if !(defined(vax) && defined(__GNUC__)) && !defined(_IBMR2)
Xextern int fprintf(/* FILE *, char *, ... */);
X#endif
X
X#ifdef KERBEROS
Xextern int krb_sendauth(/* long, int, KTEXT, char *, char *, char *,
X			u_long, MSG_DAT *, CREDENTIALS *, Key_schedule,
X			struct sockaddr_in *, struct sockaddr_in *,
X			char * */);
Xextern char *krb_realmofhost(/* char * */);
X#endif
X
Xextern int h_errno;
X
Xstatic int socket_connection(/* char *, int */);
Xstatic char *getline(/* PopServer */);
Xstatic int sendline(/* PopServer, char * */);
Xstatic int fullwrite(/* int, char *, int */);
Xstatic int getok(/* PopServer */);
X#if 0
Xstatic int gettermination(/* PopServer */);
X#endif
Xstatic void pop_trash(/* PopServer */);
X
X#define ERROR_MAX 80		/* a pretty arbitrary size */
X#define POP_PORT 110
X#define KPOP_PORT 1109
X#define POP_SERVICE "pop"
X#ifdef KERBEROS
X#ifdef KRB5
X#define KPOP_SERVICE "k5pop";
X#else
X#define KPOP_SERVICE "kpop"
X#endif
X#endif
X
Xchar pop_error[ERROR_MAX];
Xint pop_debug = 0;
X
X#ifndef min
X#define min(a,b) (((a) < (b)) ? (a) : (b))
X#endif
X
X/*
X * Function: pop_open(char *host, char *username, char *password,
X * 		      int flags)
X *
X * Purpose: Establishes a connection with a post-office server, and
X * 	completes the authorization portion of the session.
X *
X * Arguments:
X * 	host	The server host with which the connection should be
X * 		established.  Optional.  If omitted, internal
X * 		heuristics will be used to determine the server host,
X * 		if possible.
X * 	username
X * 		The username of the mail-drop to access.  Optional.
X * 		If omitted, internal heuristics will be used to
X * 		determine the username, if possible.
X * 	password
X * 		The password to use for authorization.  If omitted,
X * 		internal heuristics will be used to determine the
X * 		password, if possible.
X * 	flags	A bit mask containing flags controlling certain
X * 		functions of the routine.  Valid flags are defined in
X * 		the file pop.h
X *
X * Return value: Upon successful establishment of a connection, a
X * 	non-null PopServer will be returned.  Otherwise, null will be
X * 	returned, and the string variable pop_error will contain an
X * 	explanation of the error.
X */
XPopServer pop_open(host, username, password, flags)
Xchar *host;
Xchar *username;
Xchar *password;
Xint flags;
X{
X     int sock;
X     PopServer server;
X
X     /* Determine the user name */
X     if (! username) {
X	  username = getenv("USER");
X	  if (! (username && *username)) {
X	       username = getlogin();
X	       if (! (username && *username)) {
X		    struct passwd *passwd;
X		    passwd = getpwuid(getuid());
X		    if (passwd && passwd->pw_name && *passwd->pw_name) {
X			 username = passwd->pw_name;
X		    }
X		    else {
X			 strcpy(pop_error, "Could not determine username");
X			 return(0);
X		    }
X	       }
X	  }
X     }
X
X     /*
X      *  Determine the mail host.
X      */
X
X     if (! host) {
X	  host = getenv("MAILHOST");
X     }
X
X#ifdef HESIOD
X     if ((! host) && (! (flags & POP_NO_HESIOD))) {
X	  struct hes_postoffice *office;
X	  office = hes_getmailhost(username);
X	  if (office && office->po_type && (! strcmp(office->po_type, "POP"))
X	      && office->po_name && *office->po_name && office->po_host
X	      && *office->po_host) {
X	       host = office->po_host;
X	       username = office->po_name;
X	  }
X     }
X#endif
X
X#ifdef MAILHOST
X     if (! host) {
X	  host = MAILHOST;
X     }
X#endif
X
X     if (! host) {
X	  strcpy(pop_error, "Could not determine POP server");
X	  return(0);
X     }
X
X     /* Determine the password */
X#ifdef KERBEROS
X#define DONT_NEED_PASSWORD (! (flags & POP_NO_KERBEROS))
X#else
X#define DONT_NEED_PASSWORD 0
X#endif
X 
X     if ((! password) && (! DONT_NEED_PASSWORD)) {
X	  if (! (flags & POP_NO_GETPASS)) {
X	       password = getpass("Enter POP password:");
X	  }
X	  if (! password) {
X	       strcpy(pop_error, "Could not determine POP password");
X	       return(0);
X	  }
X     }
X     if (password)
X	  flags |= POP_NO_KERBEROS;
X     else
X	  password = username;
X
X     sock = socket_connection(host, flags);
X     if (sock == -1)
X	  return(0);
X
X     server = (PopServer) malloc(sizeof(struct _PopServer));
X     if (! server) {
X	  strcpy(pop_error, "Out of memory in pop_open");
X	  return(0);
X     }
X     server->buffer = (char *) malloc(GETLINE_MIN);
X     if (! server->buffer) {
X	  strcpy(pop_error, "Out of memory in pop_open");
X	  free((char *) server);
X	  return(0);
X     }
X	  
X     server->file = sock;
X     server->data = 0;
X     server->buffer_index = 0;
X     server->buffer_size = GETLINE_MIN;
X     server->in_multi = 0;
X
X     if (getok(server))
X	  return(0);
X
X     /*
X      * I really shouldn't use the pop_error variable like this, but....
X      */
X     if (strlen(username) > ERROR_MAX - 6) {
X	  pop_close(server);
X	  strcpy(pop_error,
X		 "Username too long; recompile pop.c with larger ERROR_MAX");
X	  return(0);
X     }
X     sprintf(pop_error, "USER %s", username);
X
X     if (sendline(server, pop_error) || getok(server)) {
X	  return(0);
X     }
X
X     if (strlen(password) > ERROR_MAX - 6) {
X	  pop_close(server);
X	  strcpy(pop_error,
X		 "Password too long; recompile pop.c with larger ERROR_MAX");
X	  return(0);
X     }
X     sprintf(pop_error, "PASS %s", password);
X
X     if (sendline(server, pop_error) || getok(server)) {
X	  return(0);
X     }
X
X     return(server);
X}
X
X/*
X * Function: pop_stat
X *
X * Purpose: Issue the STAT command to the server and return (in the
X * 	value parameters) the number of messages in the maildrop and
X * 	the total size of the maildrop.
X *
X * Return value: 0 on success, or non-zero with an error in pop_error
X * 	in failure.
X *
X * Side effects: On failure, may make further operations on the
X * 	connection impossible.
X */
Xint pop_stat(server, count, size)
XPopServer server;
Xint *count;
Xint *size;
X{
X     char *fromserver;
X
X     if (server->in_multi) {
X	  strcpy(pop_error, "In multi-line query in pop_stat");
X	  return(-1);
X     }
X     
X     if (sendline(server, "STAT") || (! (fromserver = getline(server))))
X	  return(-1);
X
X     if (strncmp(fromserver, "+OK ", 4)) {
X	  if (0 == strncmp(fromserver, "-ERR", 4)) {
X	       strncpy(pop_error, fromserver, ERROR_MAX);
X	  }
X	  else {
X	       strcpy(pop_error,
X		      "Unexpected response from POP server in pop_stat");
X	       pop_trash(server);
X	  }
X	  return(-1);
X     }
X
X     *count = atoi(&fromserver[4]);
X     
X     fromserver = index(&fromserver[4], ' ');
X     if (! fromserver) {
X	  strcpy(pop_error,
X		 "Badly formatted response from server in pop_stat");
X	  pop_trash(server);
X	  return(-1);
X     }
X
X     *size = atoi(fromserver + 1);
X
X     return(0);
X}
X
X/*
X * Function: pop_list
X *
X * Purpose: Performs the POP "list" command and returns (in value
X * 	parameters) two malloc'd zero-terminated arrays -- one of
X * 	message IDs, and a parallel one of sizes.
X *
X * Arguments:
X * 	server	The pop connection to talk to.
X * 	message	The number of the one message about which to get
X * 		information, or 0 to get information about all
X * 		messages.
X *
X * Return value: 0 on success, non-zero with error in pop_error on
X * 	failure.
X *
X * Side effects: On failure, may make further operations on the
X * 	connection impossible.
X */
Xint pop_list(server, message, IDs, sizes)
XPopServer server;
Xint message;
Xint **IDs;
Xint **sizes;
X{
X     int how_many, i;
X     char *fromserver;
X
X     if (server->in_multi) {
X	  strcpy(pop_error, "In multi-line query in pop_list");
X	  return(-1);
X     }
X
X     if (message)
X	  how_many = 1;
X     else {
X	  int count, size;
X	  if (pop_stat(server, &count, &size))
X	       return(-1);
X	  how_many = count;
X     }
X
X     *IDs = (int *) malloc((how_many + 1) * sizeof(int));
X     *sizes = (int *) malloc((how_many + 1) * sizeof(int));
X     if (! (*IDs && *sizes)) {
X	  strcpy(pop_error, "Out of memory in pop_list");
X	  return(-1);
X     }
X
X     if (message) {
X	  sprintf(pop_error, "LIST %d", message);
X	  if (sendline(server, pop_error)) {
X	       free((char *) *IDs);
X	       free((char *) *sizes);
X	       return(-1);
X	  }
X	  if (! (fromserver = getline(server))) {
X	       free((char *) *IDs);
X	       free((char *) *sizes);
X	       return(-1);
X	  }
X	  if (strncmp(fromserver, "+OK ", 4)) {
X	       if (! strncmp(fromserver, "-ERR", 4))
X		    strncpy(pop_error, fromserver, ERROR_MAX);
X	       else {
X		    strcpy(pop_error,
X			   "Unexpected response from server in pop_list");
X		    pop_trash(server);
X	       }
X	       free((char *) *IDs);
X	       free((char *) *sizes);
X	       return(-1);
X	  }
X	  (*IDs)[0] = atoi(&fromserver[4]);
X	  fromserver = index(&fromserver[4], ' ');
X	  if (! fromserver) {
X	       strcpy(pop_error,
X		      "Badly formatted response from server in pop_list");
X	       pop_trash(server);
X	       free((char *) *IDs);
X	       free((char *) *sizes);
X	       return(-1);
X	  }
X	  (*sizes)[0] = atoi(fromserver);
X	  (*IDs)[1] = (*sizes)[1] = 0;
X	  return(0);
X     }
X     else {
X	  if (pop_multi_first(server, "LIST", &fromserver)) {
X	       free((char *) *IDs);
X	       free((char *) *sizes);
X	       return(-1);
X	  }
X	  for (i = 0; i < how_many; i++) {
X	       if (pop_multi_next(server, &fromserver)) {
X		    free((char *) *IDs);
X		    free((char *) *sizes);
X		    return(-1);
X	       }
X	       (*IDs)[i] = atoi(fromserver);
X	       fromserver = index(fromserver, ' ');
X	       if (! fromserver) {
X		    strcpy(pop_error,
X			   "Badly formatted response from server in pop_list");
X		    free((char *) *IDs);
X		    free((char *) *sizes);
X		    pop_trash(server);
X		    return(-1);
X	       }
X	       (*sizes)[i] = atoi(fromserver);
X	  }
X	  if (pop_multi_next(server, &fromserver)) {
X	       free((char *) *IDs);
X	       free((char *) *sizes);
X	       return(-1);
X	  }
X	  else if (fromserver) {
X	       strcpy(pop_error,
X		      "Too many response lines from server in pop_list");
X	       free((char *) *IDs);
X	       free((char *) *sizes);
X	       return(-1);
X	  }
X	  (*IDs)[i] = (*sizes)[i] = 0;
X	  return(0);
X     }
X}
X
X/*
X * Function: pop_retrieve
X *
X * Purpose: Retrieve a specified message from the maildrop.
X *
X * Arguments:
X * 	server	The server to retrieve from.
X * 	message	The message number to retrieve.
X *	markfrom
X * 		If true, then mark the string "From " at the beginning
X * 		of lines with '>'.
X * 
X * Return value: A string pointing to the message, if successful, or
X * 	null with pop_error set if not.
X *
X * Side effects: May kill connection on error.
X */
Xchar *pop_retrieve(server, message, markfrom)
XPopServer server;
Xint message;
Xint markfrom;
X{
X     int *IDs, *sizes, bufsize, fromcount = 0, cp = 0;
X     char *ptr, *fromserver;
X     int ret;
X
X     if (server->in_multi) {
X	  strcpy(pop_error, "In multi-line query in pop_retrieve");
X	  return(0);
X     }
X
X     if (pop_list(server, message, &IDs, &sizes))
X	  return(0);
X
X     if (pop_retrieve_first(server, message, &fromserver)) {
X	  return(0);
X     }
X
X     /*
X      * The "5" below is an arbitrary constant -- I assume that if
X      * there are "From" lines in the text to be marked, there
X      * probably won't be more than 5 of them.  If there are, I
X      * allocate more space for them below.
X      */
X     bufsize = sizes[0] + (markfrom ? 5 : 0);
X     ptr = malloc(bufsize);
X     free((char *) IDs);
X     free((char *) sizes);
X
X     if (! ptr) {
X	  strcpy(pop_error, "Out of memory in pop_retrieve");
X	  pop_retrieve_flush(server);
X	  return(0);
X     }
X
X     while (! (ret = pop_retrieve_next(server, &fromserver))) {
X	  int linesize;
X
X	  if (! fromserver) {
X	       ptr[cp] = '\0';
X	       return(ptr);
X	  }
X	  if (markfrom && fromserver[0] == 'F' && fromserver[1] == 'r' &&
X		   fromserver[2] == 'o' && fromserver[3] == 'm' &&
X		   fromserver[4] == ' ') {
X	       if (++fromcount == 5) {
X		    bufsize += 5;
X		    ptr = realloc(ptr, bufsize);
X		    if (! ptr) {
X			 strcpy(pop_error, "Out of memory in pop_retrieve");
X			 pop_retrieve_flush(server);
X			 return(0);
X		    }
X		    fromcount = 0;
X	       }
X	       ptr[cp++] = '>';
X	  }
X	  linesize = strlen(fromserver);
X	  bcopy(fromserver, &ptr[cp], linesize);
X	  cp += linesize;
X	  ptr[cp++] = '\n';
X     }
X
X     if (ret) {
X	  free(ptr);
X	  return(0);
X     }
X}     
X
Xint pop_retrieve_first(server, message, response)
XPopServer server;
Xint message;
Xchar **response;
X{
X     sprintf(pop_error, "RETR %d", message);
X     return(pop_multi_first(server, pop_error, response));
X}
X
Xint pop_retrieve_next(server, line)
XPopServer server;
Xchar **line;
X{
X     return(pop_multi_next(server, line));
X}
X
Xint pop_retrieve_flush(server)
XPopServer server;
X{
X     return(pop_multi_flush(server));
X}
X
Xint pop_top_first(server, message, lines, response)
XPopServer server;
Xint message, lines;
Xchar **response;
X{
X     sprintf(pop_error, "TOP %d %d", message, lines);
X     return(pop_multi_first(server, pop_error, response));
X}
X
Xint pop_top_next(server, line)
XPopServer server;
Xchar **line;
X{
X     return(pop_multi_next(server, line));
X}
X
Xint pop_top_flush(server)
XPopServer server;
X{
X     return(pop_multi_flush(server));
X}
X
Xint pop_multi_first(server, command, response)
XPopServer server;
Xchar *command;
Xchar **response;
X{
X     if (server->in_multi) {
X	  strcpy(pop_error,
X		 "Already in multi-line query in pop_multi_first");
X	  return(-1);
X     }
X
X     if (sendline(server, command) || (! (*response = getline(server)))) {
X	  return(-1);
X     }
X
X     if (0 == strncmp(*response, "-ERR", 4)) {
X	  strncpy(pop_error, *response, ERROR_MAX);
X	  return(-1);
X     }
X     else if (0 == strncmp(*response, "+OK", 3)) {
X	  for (*response += 3; **response == ' '; (*response)++) /* empty */;
X	  server->in_multi = 1;
X	  return(0);
X     }
X     else {
X	  strcpy(pop_error,
X		 "Unexpected response from server in pop_multi_first");
X	  return(-1);
X     }
X}
X
Xint pop_multi_next(server, line)
XPopServer server;
Xchar **line;
X{
X     char *fromserver;
X
X     if (! server->in_multi) {
X	  strcpy(pop_error, "Not in multi-line query in pop_multi_next");
X	  return(-1);
X     }
X
X     fromserver = getline(server);
X     if (! fromserver) {
X	  return(-1);
X     }
X
X     if (fromserver[0] == '.') {
X	  if (! fromserver[1]) {
X	       *line = 0;
X	       server->in_multi = 0;
X	       return(0);
X	  }
X	  else {
X	       *line = fromserver + 1;
X	       return(0);
X	  }
X     }
X     else {
X	  *line = fromserver;
X	  return(0);
X     }
X}
X
Xint pop_multi_flush(server)
XPopServer server;
X{
X     char *line;
X
X     if (! server->in_multi) {
X	  return(0);
X     }
X
X     while (! pop_multi_next(server, &line)) {
X	  if (! line) {
X	       return(0);
X	  }
X     }
X
X     return(-1);
X}
X
X/* Function: pop_delete
X *
X * Purpose: Delete a specified message.
X *
X * Arguments:
X * 	server	Server from which to delete the message.
X * 	message	Message to delete.
X *
X * Return value: 0 on success, non-zero with error in pop_error
X * 	otherwise.
X */
Xint pop_delete(server, message)
XPopServer server;
Xint message;
X{
X     if (server->in_multi) {
X	  strcpy(pop_error, "In multi-line query in pop_delete");
X	  return(-1);
X     }
X
X     sprintf(pop_error, "DELE %d", message);
X
X     if (sendline(server, pop_error) || getok(server))
X	  return(-1);
X
X     return(0);
X}
X
X/*
X * Function: pop_noop
X *
X * Purpose: Send a noop command to the server.
X *
X * Argument:
X * 	server	The server to send to.
X *
X * Return value: 0 on success, non-zero with error in pop_error
X * 	otherwise.
X *
X * Side effects: Closes connection on error.
X */
Xint pop_noop(server)
XPopServer server;
X{
X     if (server->in_multi) {
X	  strcpy(pop_error, "In multi-line query in pop_noop");
X	  return(-1);
X     }
X
X     if (sendline(server, "NOOP") || getok(server))
X	  return(-1);
X
X     return(0);
X}
X
X/*
X * Function: pop_last
X *
X * Purpose: Find out the highest seen message from the server.
X *
X * Arguments:
X * 	server	The server.
X *
X * Return value: If successful, the highest seen message, which is
X * 	greater than or equal to 0.  Otherwise, a negative number with
X * 	the error explained in pop_error.
X *
X * Side effects: Closes the connection on error.
X */
Xint pop_last(server)
XPopServer server;
X{
X     char *fromserver;
X     
X     if (server->in_multi) {
X	  strcpy(pop_error, "In multi-line query in pop_last");
X	  return(-1);
X     }
X
X     if (sendline(server, "LAST"))
X	  return(-1);
X
X     if (! (fromserver = getline(server)))
X	  return(-1);
X
X     if (! strncmp(fromserver, "-ERR", 4)) {
X	  strncpy(pop_error, fromserver, ERROR_MAX);
X	  return(-1);
X     }
X     else if (strncmp(fromserver, "+OK ", 4)) {
X	  strcpy(pop_error, "Unexpected response from server in pop_last");
X	  pop_trash(server);
X	  return(-1);
X     }
X     else {
X	  return(atoi(&fromserver[4]));
X     }
X}
X
X/*
X * Function: pop_reset
X *
X * Purpose: Reset the server to its initial connect state
X *
X * Arguments:
X * 	server	The server.
X *
X * Return value: 0 for success, non-0 with error in pop_error
X * 	otherwise.
X *
X * Side effects: Closes the connection on error.
X */
Xint pop_reset(server)
XPopServer server;
X{
X     if (pop_retrieve_flush(server)) {
X	  return(-1);
X     }
X
X     if (sendline(server, "RSET") || getok(server))
X	  return(-1);
X
X     return(0);
X}
X
X/*
X * Function: pop_quit
X *
X * Purpose: Quit the connection to the server,
X *
X * Arguments:
X * 	server	The server to quit.
X *
X * Return value: 0 for success, non-zero otherwise with error in
X * 	pop_error.
X *
X * Side Effects: The PopServer passed in is unuseable after this
X * 	function is called, even if an error occurs.
X */
Xint pop_quit(server)
XPopServer server;
X{
X     int ret = 0;
X
X     if (server->file >= 0) {
X	  if (pop_retrieve_flush(server)) {
X	       ret = -1;
X	  }
X
X	  if (sendline(server, "QUIT") || getok(server)) {
X	       ret = -1;
X	  }
X
X	  close(server->file);
X     }
X
X     if (server->buffer)
X	  free(server->buffer);
X     free((char *) server);
X
X     return(ret);
X}
X
X/*
X * Function: socket_connection
X *
X * Purpose: Opens the network connection with the mail host, without
X * 	doing any sort of I/O with it or anything.
X *
X * Arguments:
X * 	host	The host to which to connect.
X *	flags	Option flags.
X * 	
X * Return value: A file descriptor indicating the connection, or -1
X * 	indicating failure, in which case an error has been copied
X * 	into pop_error.
X */
Xstatic int socket_connection(host, flags)
Xchar *host;
Xint flags;
X{
X     struct hostent *hostent;
X     struct servent *servent;
X     struct sockaddr_in addr;
X     char found_port = 0;
X     char *service;
X     int sock;
X#ifdef KERBEROS
X#ifdef KRB5
X     krb5_error_code rem;
X     krb5_ccache ccdef;
X     krb5_principal client, server;
X     krb5_error *err_ret;
X     register char *cp;
X#else
X     KTEXT ticket;
X     MSG_DAT msg_data;
X     CREDENTIALS cred;
X     Key_schedule schedule;
X     int rem;
X#endif /* KRB5 */
X#endif /* KERBEROS */
X
X     int try_count = 0;
X
X     do {
X	  hostent = gethostbyname(host);
X	  try_count++;
X	  if ((! hostent) && ((h_errno != TRY_AGAIN) || (try_count == 5))) {
X	       strcpy(pop_error, "Could not determine POP server's address");
X	       return(-1);
X	  }
X     } while (! hostent);
X
X     bzero((char *) &addr, sizeof(addr));
X     addr.sin_family = AF_INET;
X
X#ifdef KERBEROS
X     service = (flags & POP_NO_KERBEROS) ? POP_SERVICE : KPOP_SERVICE;
X#else
X     service = POP_SERVICE;
X#endif
X
X#ifdef HESIOD
X     if (! (flags & POP_NO_HESIOD)) {
X	  servent = hes_getservbyname(service, "tcp");
X	  if (servent) {
X	       addr.sin_port = servent->s_port;
X	       found_port = 1;
X	  }
X     }
X#endif
X     if (! found_port) {
X	  servent = getservbyname(service, "tcp");
X	  if (servent) {
X	       addr.sin_port = servent->s_port;
X	  }
X	  else {
X#ifdef KERBEROS
X	       addr.sin_port = htons((flags & POP_NO_KERBEROS) ?
X				     POP_PORT : KPOP_PORT);
X#else
X	       addr.sin_port = htons(POP_PORT);
X#endif
X	  }
X     }
X
X#define SOCKET_ERROR "Could not create socket for POP connection: "
X
X     sock = socket(PF_INET, SOCK_STREAM, 0);
X     if (sock < 0) {
X	  strcpy(pop_error, SOCKET_ERROR);
X	  strncat(pop_error, strerror(errno),
X		  ERROR_MAX - sizeof(SOCKET_ERROR));
X	  return(-1);
X	  
X     }
X
X     while (*hostent->h_addr_list) {
X	  bcopy(*hostent->h_addr_list, (char *) &addr.sin_addr,
X		hostent->h_length);
X	  if (! connect(sock, (struct sockaddr *) &addr, sizeof(addr)))
X	       break;
X	  hostent->h_addr_list++;
X     }
X
X#define CONNECT_ERROR "Could not connect to POP server: "
X     
X     if (! *hostent->h_addr_list) {
X	  (void) close(sock);
X	  strcpy(pop_error, CONNECT_ERROR);
X	  strncat(pop_error, strerror(errno),
X		  ERROR_MAX - sizeof(CONNECT_ERROR));
X	  return(-1);
X	  
X     }
X
X#ifdef KERBEROS
X#define KRB_ERROR "Kerberos error connecting to POP server: "
X     if (! (flags & POP_NO_KERBEROS)) {
X#ifdef KRB5
X	  krb5_init_ets();
X
X	  if (rem = krb5_cc_default(&ccdef)) {
X	  krb5error:
X	       strcpy(pop_error, KRB_ERROR);
X	       strncat(pop_error, error_message(rem),
X		       ERROR_MAX - sizeof(KRB_ERROR));
X	       (void) close(sock);
X	       return(-1);
X	  }
X
X	  if (rem = krb5_cc_get_principal(ccdef, &client)) {
X	       goto krb5error;
X	  }
X
X	  for (cp = hostent->h_name; *cp; cp++) {
X	       if (isupper(*cp)) {
X		    *cp = tolower(*cp);
X	       }
X	  }
X
X	  if (rem = krb5_sname_to_principal(hostent->h_name, POP_SERVICE,
X					    FALSE, &server)) {
X	       goto krb5error;
X	  }
X
X	  rem = krb5_sendauth((krb5_pointer) &sock, "KPOPV1.0", client, server,
X			      AP_OPTS_MUTUAL_REQUIRED,
X			      0,	/* no checksum */
X			      0,	/* no creds, use ccache instead */
X			      ccdef,
X			      0,	/* don't need seq # */
X			      0,	/* don't need subsession key */
X			      &err_ret,
X			      0);	/* don't need reply */
X	  krb5_free_principal(server);
X	  if (rem) {
X	       if (err_ret && err_ret->text.length) {
X		    strcpy(pop_error, KRB_ERROR);
X		    strncat(pop_error, error_message(rem),
X			    ERROR_MAX - sizeof(KRB_ERROR));
X		    strncat(pop_error, " [server says '",
X			    ERROR_MAX - strlen(pop_error) - 1);
X		    strncat(pop_error, err_ret->text.data,
X			    min(ERROR_MAX - strlen(pop_error) - 1,
X				err_ret->text.length));
X		    strncat(pop_error, "']",
X			    ERROR_MAX - strlen(pop_error) - 1);
X	       }
X	       else {
X		    strcpy(pop_error, KRB_ERROR);
X		    strncat(pop_error, error_message(rem),
X			    ERROR_MAX - sizeof(KRB_ERROR));
X	       }
X	       if (err_ret) {
X		    krb5_free_error(err_ret);
X	       }
X	       (void) close(sock);
X	       return(-1);
X	  }
X#else				/* ! KRB5 */	  
X	  ticket = (KTEXT) malloc(sizeof(KTEXT_ST));
X	  rem = krb_sendauth(0L, sock, ticket, "pop", hostent->h_name,
X			     (char *) krb_realmofhost(hostent->h_name),
X			     (unsigned long) 0, &msg_data, &cred, schedule,
X			     (struct sockaddr_in *) 0,
X			     (struct sockaddr_in *) 0,
X			     "KPOPV0.1");
X	  free((char *) ticket);
X	  if (rem != KSUCCESS) {
X	       strcpy(pop_error, KRB_ERROR);
X	       strncat(pop_error, krb_err_txt[rem],
X		       ERROR_MAX - sizeof(KRB_ERROR));
X	       (void) close(sock);
X	       return(-1);
X	  }
X#endif				/* KRB5 */
X     }
X#endif /* KERBEROS */
X
X     return(sock);
X} /* socket_connection */
X
X/*
X * Function: getline
X *
X * Purpose: Get a line of text from the connection and return a
X * 	pointer to it.  The carriage return and linefeed at the end of
X * 	the line are stripped, but periods at the beginnings of lines
X * 	are NOT dealt with in any special way.
X *
X * Arguments:
X * 	server	The server from which to get the line of text.
X *
X * Returns: A non-null pointer if successful, or a null pointer on any
X * 	error, with an error message copied into pop_error.
X *
X * Notes: The line returned is overwritten with each call to getline.
X *
X * Side effects: Closes the connection on error.
X */
Xstatic char *getline(server)
XPopServer server;
X{
X#define GETLINE_ERROR "Error reading from server: "
X
X     int ret;
X     
X     if (server->data) {
X	  char *cp = strstr(server->buffer + server->buffer_index, "\r\n");
X	  if (cp) {
X	       int found;
X	       int data_used;
X
X	       found = server->buffer_index;
X	       data_used = (cp + 2) - server->buffer - found;
X	       
X	       *cp = '\0'; /* terminate the string to be returned */
X	       server->data -= data_used;
X	       server->buffer_index += data_used;
X
X	       if (pop_debug)
X		    fprintf(stderr, "<<< %s\n", server->buffer + found);
X	       return(server->buffer + found);
X	  }
X	  else {
X	       bcopy(server->buffer + server->buffer_index,
X		     server->buffer, server->data);
X	       server->buffer_index = 0;
X	  }
X     }
X     else {
X	  server->buffer_index = 0;
X     }
X
X     while (1) {
X	  if (server->data == server->buffer_size) {
X	       server->buffer_size += GETLINE_INCR;
X	       server->buffer = realloc(server->buffer, server->buffer_size);
X	       if (! server->buffer) {
X		    strcpy(pop_error, "Out of memory in getline");
X		    pop_trash(server);
X		    return(0);
X	       }
X	  }
X	  ret = read(server->file, server->buffer + server->data,
X		     server->buffer_size - server->data);
X	  if (ret < 0) {
X	       strcpy(pop_error, GETLINE_ERROR);
X	       strncat(pop_error, strerror(errno),
X		       ERROR_MAX - sizeof(GETLINE_ERROR));
X	       pop_trash(server);
X	       return(0);
X	  }
X	  else if (ret == 0) {
X	       strcpy(pop_error, "Unexpected EOF from server in getline");
X	       pop_trash(server);
X	       return(0);
X	  }
X	  else {
X	       char *cp = strstr(server->buffer, "\r\n");
X	       server->data += ret;
X	       
X	       if (cp) {
X		    int data_used = (cp + 2) - server->buffer;
X		    *cp = '\0';
X		    server->data -= data_used;
X		    server->buffer_index = data_used;
X
X		    if (pop_debug)
X			 fprintf(stderr, "<<< %s\n", server->buffer);
X		    return(server->buffer);
X	       }
X	  }
X     }
X
X     /* NOTREACHED */
X}
X
X/*
X * Function: sendline
X *
X * Purpose: Sends a line of text to the POP server.  The line of text
X * 	passed into this function should NOT have the carriage return
X * 	and linefeed on the end of it.  Periods at beginnings of lines
X * 	will NOT be treated specially by this function.
X *
X * Arguments:
X * 	server	The server to which to send the text.
X * 	line	The line of text to send.
X *
X * Return value: Upon successful completion, a value of 0 will be
X * 	returned.  Otherwise, a non-zero value will be returned, and
X * 	an error will be copied into pop_error.
X *
X * Side effects: Closes the connection on error.
X */
Xstatic int sendline(server, line)
XPopServer server;
Xchar *line;
X{
X#define SENDLINE_ERROR "Error writing to POP server: "
X     int ret;
X
X     ret = fullwrite(server->file, line, strlen(line));
X     if (ret >= 0) { /* 0 indicates that a blank line was written */
X	  ret = fullwrite(server->file, "\r\n", 2);
X     }
X
X     if (ret < 0) {
X	  pop_trash(server);
X	  strcpy(pop_error, SENDLINE_ERROR);
X	  strncat(pop_error, strerror(errno),
X		  ERROR_MAX - sizeof(SENDLINE_ERROR));
X	  return(ret);
X     }
X
X     if (pop_debug)
X	  fprintf(stderr, ">>> %s\n", line);
X
X     return(0);
X}
X
X/*
X * Procedure: fullwrite
X *
X * Purpose: Just like write, but keeps trying until the entire string
X * 	has been written.
X *
X * Return value: Same as write.  Pop_error is not set.
X */
Xstatic int fullwrite(fd, buf, nbytes)
Xint fd;
Xchar *buf;
Xint nbytes;
X{
X     char *cp;
X     int ret;
X
X     cp = buf;
X     while ((ret = write(fd, cp, nbytes)) > 0) {
X	  cp += ret;
X	  nbytes -= ret;
X     }
X
X     return(ret);
X}
X
X/*
X * Procedure getok
X *
X * Purpose: Reads a line from the server.  If the return indicator is
X * 	positive, return with a zero exit status.  If not, return with
X * 	a negative exit status.
X *
X * Arguments:
X * 	server	The server to read from.
X * 
X * Returns: 0 for success, else for failure and puts error in pop_error.
X *
X * Side effects: On failure, may make the connection unuseable.
X */
Xstatic int getok(server)
XPopServer server;
X{
X     char *fromline;
X
X     if (! (fromline = getline(server))) {
X	  return(-1);
X     }
X
X     if (! strncmp(fromline, "+OK", 3))
X	  return(0);
X     else if (! strncmp(fromline, "-ERR", 4)) {
X	  strncpy(pop_error, fromline, ERROR_MAX);
X	  pop_error[ERROR_MAX-1] = '\0';
X	  return(-1);
X     }
X     else {
X	  strcpy(pop_error,
X		 "Unexpected response from server; expecting +OK or -ERR");
X	  pop_trash(server);
X	  return(-1);
X     }
X}	  
X
X#if 0
X/*
X * Function: gettermination
X *
X * Purpose: Gets the next line and verifies that it is a termination
X * 	line (nothing but a dot).
X *
X * Return value: 0 on success, non-zero with pop_error set on error.
X *
X * Side effects: Closes the connection on error.
X */
Xstatic int gettermination(server)
XPopServer server;
X{
X     char *fromserver;
X
X     fromserver = getline(server);
X     if (! fromserver)
X	  return(-1);
X
X     if (strcmp(fromserver, ".")) {
X	  strcpy(pop_error,
X		 "Unexpected response from server in gettermination");
X	  pop_trash(server);
X	  return(-1);
X     }
X
X     return(0);
X}
X#endif
X
X/*
X * Function pop_close
X *
X * Purpose: Close a pop connection, sending a "RSET" command to try to
X * 	preserve any changes that were made and a "QUIT" command to
X * 	try to get the server to quit, but ignoring any responses that
X * 	are received.
X *
X * Side effects: The server is unuseable after this function returns.
X * 	Changes made to the maildrop since the session was started (or
X * 	since the last pop_reset) may be lost.
X */
Xvoid pop_close(server)
XPopServer server;
X{
X     pop_trash(server);
X     free((char *) server);
X
X     return;
X}
X
X/*
X * Function: pop_trash
X *
X * Purpose: Like pop_close or pop_quit, but doesn't deallocate the
X * 	memory associated with the server.  It is legal to call
X * 	pop_close or pop_quit after this function has been called.
X */
Xstatic void pop_trash(server)
XPopServer server;
X{
X     if (server->file >= 0) {
X	  sendline(server, "RSET");
X	  sendline(server, "QUIT");
X
X	  close(server->file);
X	  server->file = -1;
X	  if (server->buffer) {
X	       free(server->buffer);
X	       server->buffer = 0;
X	  }
X     }
X}
X
X#endif /* MAIL_USE_POP */
END_OF_FILE
if test 31552 -ne `wc -c <'pop.c'`; then
    echo shar: \"'pop.c'\" unpacked with wrong size!
fi
# end of 'pop.c'
fi
if test -f 'pop.h' -a "${1}" != "-c" ; then 
  echo shar: Will not clobber existing file \"'pop.h'\"
else
echo shar: Extracting \"'pop.h'\" \(2487 characters\)
sed "s/^X//" >'pop.h' <<'END_OF_FILE'
X/*
X * pop.h: Header file for the "pop.c" client POP3 protocol
X * implementation.
X * 
X * Copyright (c) 1991,1993 by Jonathan Kamens.
X *
X * Distribution and use of this file is governed by the GNU Public
X * License (version 1 or any later version).
X *
X * If you make any enhancements, bug fixes or porting changes to this
X * file, please make sure that they get sent to me so that I can
X * incorporate them into my master version of it.  Try sending me
X * E-mail at jik@security.ov.com, or, if that fails, at
X * jik@athena.mit.edu.
X *
X * The current version of this file is $Revision: 1.1 $.
X */
X
X#include <stdio.h>
X
X#define GETLINE_MIN 1024	/* the getline buffer starts out this */
X				/* size */
X#define GETLINE_INCR 1024	/* the getline buffer is grown by this */
X				/* size when it needs to grow */
X
Xextern char pop_error[];
Xextern int pop_debug;
X
Xtypedef struct _PopServer {
X     int file, data;
X     char *buffer;
X     int buffer_size, buffer_index;
X     int in_multi;
X} *PopServer;
X
X/*
X * Valid flags for the pop_open function.
X */
X
X#define POP_NO_KERBEROS	(1<<0)
X#define POP_NO_HESIOD	(1<<1)
X#define POP_NO_GETPASS 	(1<<2)
X
X#ifdef __STDC__
X#define _ARGS(a) a
X#else
X#define _ARGS(a) ()
X#endif
X
Xextern PopServer pop_open _ARGS((char *host, char *username, char *password,
X				 int flags));
Xextern int pop_stat _ARGS((PopServer server, int *count, int *size));
Xextern int pop_list _ARGS((PopServer server, int message, int **IDs,
X			   int **size));
Xextern char *pop_retrieve _ARGS((PopServer server, int message, int markfrom));
Xextern int pop_retrieve_first _ARGS((PopServer server, int message,
X				     char **response));
Xextern int pop_retrieve_next _ARGS((PopServer server, char **line));
Xextern int pop_retrieve_flush _ARGS((PopServer server));
Xextern int pop_top_first _ARGS((PopServer server, int message, int lines,
X				char **response));
Xextern int pop_top_next _ARGS((PopServer server, char **line));
Xextern int pop_top_flush _ARGS((PopServer server));
Xextern int pop_multi_first _ARGS((PopServer server, char *command,
X				  char **response));
Xextern int pop_multi_next _ARGS((PopServer server, char **line));
Xextern int pop_multi_flush _ARGS((PopServer server));
Xextern int pop_delete _ARGS((PopServer server, int message));
Xextern int pop_noop _ARGS((PopServer server));
Xextern int pop_last _ARGS((PopServer server));
Xextern int pop_reset _ARGS((PopServer server));
Xextern int pop_quit _ARGS((PopServer server));
Xextern void pop_close _ARGS((PopServer));
X
X#undef _ARGS
END_OF_FILE
if test 2487 -ne `wc -c <'pop.h'`; then
    echo shar: \"'pop.h'\" unpacked with wrong size!
fi
# end of 'pop.h'
fi
if test -f 'strstr.c' -a "${1}" != "-c" ; then 
  echo shar: Will not clobber existing file \"'strstr.c'\"
else
echo shar: Extracting \"'strstr.c'\" \(1721 characters\)
sed "s/^X//" >'strstr.c' <<'END_OF_FILE'
X#ifdef LOCAL_STRSTR
X
X/*-
X * Copyright (c) 1990 The Regents of the University of California.
X * All rights reserved.
X *
X * This code is derived from software contributed to Berkeley by
X * Chris Torek.
X *
X * Redistribution and use in source and binary forms are permitted
X * provided that: (1) source distributions retain this entire copyright
X * notice and comment, and (2) distributions including binaries display
X * the following acknowledgement:  ``This product includes software
X * developed by the University of California, Berkeley and its contributors''
X * in the documentation or other materials provided with the distribution
X * and in all advertising materials mentioning features or use of this
X * software. Neither the name of the University nor the names of its
X * contributors may be used to endorse or promote products derived
X * from this software without specific prior written permission.
X * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
X * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
X * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
X */
X
X#if defined(LIBC_SCCS) && !defined(lint)
Xstatic char sccsid[] = "@(#)strstr.c	5.1 (Berkeley) 5/15/90";
X#endif /* LIBC_SCCS and not lint */
X
X#include <sys/types.h>
X#include <string.h>
X#include <stdio.h>
X
X#ifndef __STDC__
X#define const
X#endif
X
X/*
X * Find the first occurrence of find in s.
X */
Xchar *
Xstrstr(s, find)
X	register const char *s, *find;
X{
X	register char c, sc;
X	register size_t len;
X
X	if ((c = *find++) != 0) {
X		len = strlen(find);
X		do {
X			do {
X				if ((sc = *s++) == 0)
X					return (NULL);
X			} while (sc != c);
X		} while (strncmp(s, find, len) != 0);
X		s--;
X	}
X	return ((char *)s);
X}
X
X#endif
END_OF_FILE
if test 1721 -ne `wc -c <'strstr.c'`; then
    echo shar: \"'strstr.c'\" unpacked with wrong size!
fi
# end of 'strstr.c'
fi
echo shar: End of shell archive.
exit 0