match(uid_t uid, gid_t *groups, int ngroups, uid_t target, const char *cmd,
    const char **cmdargs, struct rule *r)
{
	int i;

	if (r->ident[0] == ':') {
		gid_t rgid;
		if (parsegid(r->ident + 1, &rgid) == -1)
			return 0;
		for (i = 0; i < ngroups; i++) {
			if (rgid == groups[i])
				break;
		}
		if (i == ngroups)
			return 0;
	} else {
		if (uidcheck(r->ident, uid) != 0)
			return 0;
	}
	if (r->target && uidcheck(r->target, target) != 0)
		return 0;
	if (r->cmd) {
		if (strcmp(r->cmd, cmd))
			return 0;
		if (r->cmdargs) {
			/* if arguments were given, they should match explicitly */
			for (i = 0; r->cmdargs[i]; i++) {
				if (!cmdargs[i])
					return 0;
				if (strcmp(r->cmdargs[i], cmdargs[i]))
					return 0;
			}
			if (cmdargs[i])
				return 0;
		}
	}
	return 1;
}