https://bugs.exim.org/show_bug.cgi?id=2929
Bug ID: 2929
Summary: Failed to expand $recipients after running external
command with ${run} in ACL
Product: Exim
Version: 4.96
Hardware: x86-64
OS: All
Status: NEW
Severity: bug
Priority: medium
Component: String expansion
Assignee: unallocated@???
Reporter: r.jenster@???
CC: exim-dev@???
In exim 4.96 it is not possible to expand $recipients after running an external
command using the ${run} expansion. The expaned $recipients variable is empty.
This does not happen in exim 4.94 and 4.95.
You can check this with the following minimal config:
```
acl_smtp_predata = myacl
acl_smtp_rcpt = accept_all
begin acl
myacl:
warn
logwrite = before run: $recipients
set acl_m0 = ${run{/bin/true}}
logwrite = after run: $recipients
accept_all:
accept
```
## Analysis
-----------
I tried to bisect the issue, and discovered that after reverting commit
https://git.exim.org/exim.git/commit/cfe6acff2ddc7eb03b3489770219edf829abd323
the $recipients variable is expanded again as expected.
So I digged a bit deeper.
The function transport_set_up_command is called for the string expansion of
${run {command}} in src/src/expand.c now enables argument expansion by default
here:
https://git.exim.org/exim.git/blob/cfe6acff2ddc7eb03b3489770219edf829abd323:/src/src/expand.c#l5593
But within the argument expansion in transport_set_up_command the global option
enable_dollar_recipients is disabled here
https://git.exim.org/exim.git/blob/cfe6acff2ddc7eb03b3489770219edf829abd323:/src/src/transport.c#l2349
While this may work for transports, it is not a good idea when ${run} is used
in ACLs.
Attached you'll find a patch that resets the global option
enable_dollar_recipients. This makes the expansion of $recipients work again.
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