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crypt.c
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C/C++ Source or Header
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1992-07-05
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4KB
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194 lines
/*
* Encryption utilites
* Bradley Williams
* {allegra,ihnp4,uiucdcs,ctvax}!convex!williams
* $Revision: 6.21 $
*/
#if !defined(VMS) && !defined(MSDOS) && !defined(__OS2__) && defined(CRYPT_PATH)
#include <stdio.h>
#include <curses.h>
#if defined(BSD42) || defined(BSD43)
#include <sys/types.h>
#include <sys/file.h>
#else
#include <fcntl.h>
#endif
#include "sc.h"
char *getpass();
#ifdef SYSV3
void exit();
#endif
int Crypt = 0;
#define MAXKEYWORDSIZE 30
char KeyWord[MAXKEYWORDSIZE] = {""};
void
creadfile (save, eraseflg)
char *save;
int eraseflg;
{
register FILE *f;
int pipefd[2];
int fildes;
int pid;
if (eraseflg && strcmp(save, curfile) && modcheck(" first")) return;
if ((fildes = open(findhome(save), O_RDONLY, 0)) < 0)
{
error ("Can't read file \"%s\"", save);
return;
}
if (eraseflg) erasedb ();
if (pipe(pipefd) < 0) {
error("Can't make pipe to child");
return;
}
deraw();
(void) strcpy(KeyWord, getpass("Enter key:"));
goraw();
if ((pid=fork()) == 0) /* if child */
{
(void) close (0); /* close stdin */
(void) close (1); /* close stdout */
(void) close (pipefd[0]); /* close pipe input */
(void) dup (fildes); /* standard in from file */
(void) dup (pipefd[1]); /* connect to pipe */
(void) fprintf (stderr, " ");
(void) execl (CRYPT_PATH, "crypt", KeyWord, 0);
(void) fprintf (stderr, "execl(%s, \"crypt\", %s, 0) in creadfile() failed",
CRYPT_PATH, KeyWord);
exit (-127);
}
else /* else parent */
{
(void) close (fildes);
(void) close (pipefd[1]); /* close pipe output */
if ((f = fdopen (pipefd[0], "r")) == (FILE *)0)
{
(void) kill (pid, -9);
error ("Can't fdopen file \"%s\"", save);
(void) close (pipefd[0]);
return;
}
}
loading++;
while (fgets(line,sizeof line,f)) {
linelim = 0;
if (line[0] != '#') (void) yyparse ();
}
--loading;
(void) fclose (f);
(void) close (pipefd[0]);
while (pid != wait(&fildes)) /**/;
linelim = -1;
modflg++;
if (eraseflg) {
(void) strcpy (curfile, save);
modflg = 0;
}
EvalAll();
}
int
cwritefile (fname, r0, c0, rn, cn)
char *fname;
int r0, c0, rn, cn;
{
register FILE *f;
int pipefd[2];
int fildes;
int pid;
char save[PATHLEN];
char *fn;
char *busave;
if (*fname == '\0') fname = &curfile[0];
fn = fname;
while (*fn && (*fn == ' ')) /* Skip leading blanks */
fn++;
if ( *fn == '|' ) {
error ("Can't have encrypted pipe");
return(-1);
}
(void) strcpy(save,fname);
busave = findhome(save);
#ifdef DOBACKUPS
if (!backup_file(busave) &&
(yn_ask("Could not create backup copy, Save anyhow?: (y,n)") != 1))
return(0);
#endif
if ((fildes = open (busave, O_TRUNC|O_WRONLY|O_CREAT, 0600)) < 0)
{
error ("Can't create file \"%s\"", save);
return(-1);
}
if (pipe (pipefd) < 0) {
error ("Can't make pipe to child\n");
return(-1);
}
if (KeyWord[0] == '\0') {
deraw();
(void) strcpy(KeyWord, getpass("Enter key:"));
goraw();
}
if ((pid=fork()) == 0) /* if child */
{
(void) close (0); /* close stdin */
(void) close (1); /* close stdout */
(void) close (pipefd[1]); /* close pipe output */
(void) dup (pipefd[0]); /* connect to pipe input */
(void) dup (fildes); /* standard out to file */
(void) fprintf (stderr, " ");
(void) execl (CRYPT_PATH, "crypt", KeyWord, 0);
(void) fprintf (stderr, "execl(%s, \"crypt\", %s, 0) in cwritefile() failed",
CRYPT_PATH, KeyWord);
exit (-127);
}
else /* else parent */
{
(void) close (fildes);
(void) close (pipefd[0]); /* close pipe input */
f = fdopen (pipefd[1], "w");
if (f == 0)
{
(void) kill (pid, -9);
error ("Can't fdopen file \"%s\"", save);
(void) close (pipefd[1]);
return(-1);
}
}
write_fd(f, r0, c0, rn, cn);
(void) fclose (f);
(void) close (pipefd[1]);
while (pid != wait(&fildes)) /**/;
(void) strcpy(curfile,save);
modflg = 0;
error ("File \"%s\" written (encrypted).", curfile);
return(0);
}
#endif /* CRYPT_PATH */