When I tried to use inetd as an unprivileged user on linux (4.9.x, x86_64, glibc or musl), I get:
inetd: can't set groups: Operation not permitted I believe the problem is line 1486, where it compares the desired uid to 0, rather than to the current uid, to decide whether to set groups. For example: printf '127.0.0.1:3030 stream tcp nowait jack ./echo.sh' > inetd.conf printf '#!/bin/sh\necho ok\nsleep 1' > echo.sh chmod 755 echo.sh ./busybox inetd -e -f inetd.conf & nc 127.0.0.1 3030 With the patch, it echoes "ok". Without the patch, inetd gives an error: inetd: can't set groups: Operation not permitted Of course, to placate line 1486 one could use: printf '127.0.0.1:3030 stream tcp nowait root ./echo.sh' > inetd.conf but this results in the earlier error: inetd: non-root must run services as himself
inetd-setgroups-fix.diff
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