New to Mutt, unable to send messages in *any* attempted way

[raf]

On Fri, May 20, 2022 at 05:54:55PM +1000, raf <mutt at raf.org> wrote:

> I'm sending a patch that adds an error check for shell
> meta-characters when $sendmail is used. It might have been
> better to check right after reading .muttrc, but this seemed
> like a more natural place to put the code (i.e., right after
> the check that $sendmail exists).

I tried to send the patch to mutt-dev at mutt.org a few times but
never received it, so I'll send it here instead.

cheers,
raf

> Subject: [PATCH] Add error when $sendmail has shell metachars

---
 sendlib.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sendlib.c b/sendlib.c
index 430b5d73..05039714 100644
--- a/sendlib.c
+++ b/sendlib.c
@@ -2706,6 +2706,14 @@ mutt_invoke_sendmail (ADDRESS *from,     /* the sender */
     return -1;
   }

+  /* check for shell meta-characters that won't do what the user expects */
+#define SHELL_NON_SPACE_META_CHARACTERS "|&;()<>[]{}$`'~\"\\*?"
+  if (Sendmail[strcspn(Sendmail, SHELL_NON_SPACE_META_CHARACTERS)] != '\0')
+  {
+    mutt_error(_("$sendmail cannot contain shell meta-characters."));
+    return -1;
+  }
+
   ps = s;
   i = 0;
   while ((ps = strtok (ps, " ")))
--
2.30.2