99 lines
2.4 KiB
Plaintext
99 lines
2.4 KiB
Plaintext
--- b.c.orig Fri Jan 20 00:38:25 1995
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+++ b.c Sun Dec 3 09:58:21 2000
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@@ -21,6 +21,9 @@
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#include <pwd.h>
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#endif
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#include <errno.h>
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+#include <sys/file.h>
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+#include <sys/types.h>
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+#include <sys/stat.h>
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#include "config.h"
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#include "blocks.h"
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@@ -201,6 +204,7 @@
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if(prop) b->o=prop->o;
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else b->o=pdefault;
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mset(b->marks,0,sizeof(b->marks));
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+ b->filehandle = -1; /* initialize filehandle &&& ob */
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b->rdonly=0;
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b->orphan=0;
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b->oldcur=0;
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@@ -255,6 +259,10 @@
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{
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if(b && !--b->count)
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{
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+ if (b->filehandle != -1) {
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+ /* close filehandle, free lock &&& ob */
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+ close (b->filehandle);
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+ }
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if(b->changed) abrerr(b->name);
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if(b==errbuf) errbuf=0;
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if(b->undo) undorm(b->undo);
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@@ -1671,7 +1679,8 @@
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B *b;
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long skip,amnt;
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char *n;
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- int nowrite=0;
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+ struct stat sb;
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+ int nowrite=0,fh=-1;
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if(!s || !s[0])
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{
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@@ -1704,6 +1713,28 @@
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else fclose(fi);
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fi=fopen(n,"r");
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if(!fi) nowrite=0;
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+/*printf ("nowrite open=%i\n", nowrite); */
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+
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+ /* check file mod, if no write flags set,
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+ joe in read only mode. &&& ob */
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+
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+ if (!nowrite) {
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+ nowrite = (!stat (n, &sb)) && (!(sb.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)));
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+ }
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+/*printf ("nowrite stat=%i\n", nowrite); */
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+
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+ /* lock the file if writable, or go into read only mode if
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+ already locked, */
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+
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+ if ((fi) && (!nowrite)) {
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+ fh = dup( fileno(fi) );
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+ nowrite = (flock (fh, LOCK_EX | LOCK_NB));
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+ }
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+/*printf ("nowrite flock=%i\n", nowrite); */
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+
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+/*nowrite = 1; */ /* for test purpose */
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+/*printf ("nowrite=%i\n", nowrite); */
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+
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}
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joesep(n);
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@@ -1761,6 +1792,7 @@
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vsrm(n);
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b->er=error;
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+ if( fh != -1 ) b->filehandle = fh;
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return b;
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}
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@@ -1990,7 +2022,18 @@
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{
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long tim=time(0);
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B *b;
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- FILE *f=fopen("DEADJOE","a");
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+ FILE *f;
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+ struct stat sb;
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+ if ((lstat("DEADJOE", &sb) == 0) && (((sb.st_mode & S_IFLNK) && (sb.st_uid != getuid())) || (sb.st_nlink > 1)))
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+ {
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+ printf("*** JOE was aborted ");
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+ if (sig) printf("by signal %d, cannot save DEADJOE due to unsafe symlink\n",sig);
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+ else printf("because the terminal closed, cannot save DEADJOE due to unsafe symlink\n");
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+ if(sig) ttclsn();
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+ _exit(1);
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+ }
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+ f=fopen("DEADJOE","a");
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+ chmod("DEADJOE", S_IRUSR | S_IWUSR);
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fprintf(f,"\n*** Modified files in JOE when it aborted on %s",ctime(&tim));
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if(sig) fprintf(f,"*** JOE was aborted by signal %d\n",sig);
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else fprintf(f,"*** JOE was aborted because the terminal closed\n");
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