Standardize apps use of -rand, etc.

Standardized the -rand flag and added a new one:
    -rand file...
            Always reads the specified files
    -writerand file
            Always writes to the file on exit

For apps that use a config file, the RANDFILE config parameter reads
the file at startup (to seed the RNG) and write to it on exit if
the -writerand flag isn't used.

Ensured that every app that took -rand also took -writerand, and
made sure all of that agreed with all the documentation.

Fix error reporting in write_file and -rand

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/3862)

1 files changed, 9 insertions, 3 deletions

diff --git a/doc/man1/s_server.pod b/doc/man1/s_server.pod
index b1195fdae3..986578937e 100644
--- a/doc/man1/s_server.pod
+++ b/doc/man1/s_server.pod
@@ -52,7 +52,8 @@ B<openssl> B<s_server>
 [B<-tlsextdebug>]
 [B<-HTTP>]
 [B<-id_prefix val>]
-[B<-rand val>]
+[B<-rand file...>]
+[B<-writerand file>]
 [B<-keymatexport val>]
 [B<-keymatexportlen +int>]
 [B<-CRL infile>]
@@ -381,14 +382,19 @@ for testing any SSL/TLS code (eg. proxies) that wish to deal with multiple
 servers, when each of which might be generating a unique range of session
 IDs (eg. with a certain prefix).
 
-=item B<-rand val>
+=item B<-rand file...>
 
 A file or files containing random data used to seed the random number
-generator, or an EGD socket (see L<RAND_egd(3)>).
+generator.
 Multiple files can be specified separated by an OS-dependent character.
 The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
 all others.
 
+=item [B<-writerand file>]
+
+Writes random data to the specified I<file> upon exit.
+This can be used with a subsequent B<-rand> flag.
+
 =item B<-verify_return_error>
 
 Verification errors normally just print a message but allow the