adding permissions check for the logfile name

Screen shows error message and terminates if you
specify not available (permissions problem?) logfile
name (-L parameter).

bug #49491

Signed-off-by: Alexander Naumov <alexander_naumov@opensuse.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/screen.c b/src/screen.c
index 97bf85c..97c2597 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -670,6 +670,12 @@ int main(int ac, char** av)
                 Panic(0, "-L: logfile name can not start with \"-\" symbol");
               if (strlen(screenlogfile) > PATH_MAX)
                 Panic(0, "-L: logfile name too long. (max. %d char)", PATH_MAX);
+
+              FILE *w_check;
+              if ((w_check = fopen(screenlogfile, "w")) == NULL)
+                Panic(0, "-L: logfile name access problem");
+              else
+                fclose(w_check);
             }
             nwin_options.Lflag = 1;
             break;