On Tue, Aug 15, 2017 at 09:09:45AM -0700, Stephen Hemminger wrote: > On Sat, 12 Aug 2017 14:05:09 +0200 > Phil Sutter <p...@nwl.cc> wrote: > > > +void assert_valid_dev_name(const char *, const char *); > > Not a fan of long function names. > “I have only made this letter longer because I have not had the time to make > it shorter."
:) > Maybe just add a new function addattr_ifname() and add the checking there? It is not only about netlink attributes - these are in fact unproblematic, since they allow for interface names longer than IFNAMSIZ-1 and the kernel will then reject. The length check has to happen before copying into any IFNAMSIZ-sized buffer takes place (e.g. ifr_name of struct ifreq). Logically I would prefer to perform the checks right at the point user input parsing takes place since it belongs there. I could rename the function to 'ifname_valid' instead? I liked having 'assert' in the name though, since the function calls exit() on error. Thanks, Phil
