Both files in this commit exhibit the wrong way to use temporary files.

For TEHistory.cpp, it uses tmpfile() which produces a file which has a
name that can be guessed.

For vmemo.cpp, it uses tmpname() which only creates a predictable string.

Both uses have been switched to using mkstemp() wrapped around umask(). This
produces a much less predictable file that also has guaranteed restrictive
permissions.

I went a little farther in vmemo because it calls out to the shell using
system to 'mv' the new file. That is kinda wasteful so I switched it to use
rename instead.

1 files changed, 24 insertions, 3 deletions

diff --git a/noncore/apps/opie-console/TEHistory.cpp b/noncore/apps/opie-console/TEHistory.cpp
index 317ce57..e2be42a 100644
--- a/noncore/apps/opie-console/TEHistory.cpp
+++ b/noncore/apps/opie-console/TEHistory.cpp
@@ -1,149 +1,170 @@
 /* -------------------------------------------------------------------------- */
 /*                                                                            */
 /* [TEHistory.C]                   History Buffer                             */
 /*                                                                            */
 /* -------------------------------------------------------------------------- */
 /*                                                                            */
 /* Copyright (c) 1997,1998 by Lars Doelle <lars.doelle@on-line.de>            */
 /*                                                                            */
 /* This file is part of Konsole - an X terminal for KDE                       */
 /*                                                                            */
 /* -------------------------------------------------------------------------- */
         /*                                                                    */
 /* Ported Konsole to Qt/Embedded                                              */
         /*                                                                    */
 /* Copyright (C) 2000 by John Ryland <jryland@trolltech.com>                  */
         /*                                                                    */
 /* -------------------------------------------------------------------------- */
 
 #include "TEHistory.h"
 #include <stdlib.h>
 #include <assert.h>
 #include <stdio.h>
 #include <sys/types.h>
+#include <sys/stat.h>
 #include <unistd.h>
 #include <errno.h>
 
 #define HERE printf("%s(%d): here\n",__FILE__,__LINE__)
 
 /*
    An arbitrary long scroll.
 
    One can modify the scroll only by adding either cells
    or newlines, but access it randomly.
 
    The model is that of an arbitrary wide typewriter scroll
    in that the scroll is a serie of lines and each line is
    a serie of cells with no overwriting permitted.
 
    The implementation provides arbitrary length and numbers
    of cells and line/column indexed read access to the scroll
    at constant costs.
 
 FIXME: some complain about the history buffer comsuming the
        memory of their machines. This problem is critical
        since the history does not behave gracefully in cases
        where the memory is used up completely.
 
        I put in a workaround that should handle it problem
        now gracefully. I'm not satisfied with the solution.
 
 FIXME: Terminating the history is not properly indicated
        in the menu. We should throw a signal.
 
 FIXME: There is noticable decrease in speed, also. Perhaps,
        there whole feature needs to be revisited therefore.
        Disadvantage of a more elaborated, say block-oriented
        scheme with wrap around would be it's complexity.
 */
 
 //FIXME: tempory replacement for tmpfile
 //       this is here one for debugging purpose.
 
 //#define tmpfile xTmpFile
 
 FILE* xTmpFile()
 {
   static int fid = 0;
   char fname[80];
   sprintf(fname,"TmpFile.%d",fid++);
   return fopen(fname,"w");
 }
 
 
 // History Buffer ///////////////////////////////////////////
 
 /*
    A Row(X) data type which allows adding elements to the end.
 */
 
 HistoryBuffer::HistoryBuffer()
 {
   ion    = -1;
   length = 0;
 }
 
 HistoryBuffer::~HistoryBuffer()
 {
   setScroll(FALSE);
 }
 
 void HistoryBuffer::setScroll(bool on)
 {
   if (on == hasScroll()) return;
 
   if (on)
   {
     assert( ion < 0 );
     assert( length == 0);
-    FILE* tmp = tmpfile(); if (!tmp) { perror("konsole: cannot open temp file.\n"); return; }
-    ion = dup(fileno(tmp)); if (ion<0) perror("konsole: cannot dup temp file.\n");
-    fclose(tmp);
+    char* tmpDir = getenv("TMPDIR");
+    char* tmpFilePath = 0;
+    if (tmpDir && *tmpDir != '\0') {
+        tmpFilePath = new char[strlen(tmpDir) + strlen("/opie-console-HistoryBuffer-XXXXXX") + 1];
+        strcpy(tmpFilePath, tmpDir);
+        free(tmpDir);
+    } else {
+        tmpFilePath = new char[strlen("/tmp/opie-console-HistoryBuffer-XXXXXX") + 1];
+        strcpy(tmpFilePath, "/tmp");
+    }
+    strcat(tmpFilePath, "/opie-console-HistoryBuffer-XXXXXX");
+    mode_t currUmask = umask(S_IRWXO | S_IRWXG);
+    int tmpfd = mkstemp(tmpFilePath);
+    delete [] tmpFilePath;
+    umask(currUmask);
+    if (tmpfd == -1) {
+        perror("konsole: cannot open temp file.\n");
+        return;
+    }
+    ion = dup(tmpfd);
+    if (ion<0)
+        perror("konsole: cannot dup temp file.\n");
+    close(tmpfd);
   }
   else
   {
     assert( ion >= 0 );
     close(ion);
     ion    = -1;
     length = 0;
   }
 }
 
 bool HistoryBuffer::hasScroll()
 {
   return ion >= 0;
 }
 
 void HistoryBuffer::add(const unsigned char* bytes, int len)
 { int rc;
   assert(hasScroll());
   rc = lseek(ion,length,SEEK_SET); if (rc < 0) { perror("HistoryBuffer::add.seek"); setScroll(FALSE); return; }
   rc = write(ion,bytes,len);       if (rc < 0) { perror("HistoryBuffer::add.write"); setScroll(FALSE); return; }
   length += rc;
 }
 
 void HistoryBuffer::get(unsigned char* bytes, int len, int loc)
 { int rc;
   assert(hasScroll());
   if (loc < 0 || len < 0 || loc + len > length)
     fprintf(stderr,"getHist(...,%d,%d): invalid args.\n",len,loc);
   rc = lseek(ion,loc,SEEK_SET); if (rc < 0) { perror("HistoryBuffer::get.seek"); setScroll(FALSE); return; }
   rc = read(ion,bytes,len);     if (rc < 0) { perror("HistoryBuffer::get.read"); setScroll(FALSE); return; }
 }
 
 int HistoryBuffer::len()
 {
   return length;
 }
 
 // History Scroll //////////////////////////////////////
 
 /* 
    The history scroll makes a Row(Row(Cell)) from
    two history buffers. The index buffer contains
    start of line positions which refere to the cells
    buffer.
 
    Note that index[0] addresses the second line
    (line #1), while the first line (line #0) starts
    at 0 in cells.