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asn1: Add --decorate=... for internal bookkeeping

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This option, `--decorate=TYPE-NAME:FIELD-TYPE:field-name[?]` allows one to add
a field to any struct generated by the ASN.1 compiler for any SET or SEQUENCE
type such that:

 - the field will     be freed by the `free_TYPE_NAME()` function
 - the field will     be copied by the `copy_TYPE_NAME()` function
 - the field will not be printed by the `print_TYPE_NAME()` function
 - the field will NOT be encoded or decoded

This is useful for internal bookkeeping.

The first use of this may well be for adding an optional field to
`Principal` where information about name attributes will be stored,
which will then allow us to have GSS name attributes for the krb5
mechanism w/o having to refactor the mechanism to use a different
structure for representing `gss_name_t` mechnames than the one currently
used (`Principal`; `krb5_principal` happens to be a typedef alias of
`Principal *`).

So w/o massive rototilling of the GSS krb5 mechanism we can have name
attributes, _and_ we'll also be able to have those in the krb5 API as
well w/o any massive rototilling there either.
This commit is contained in:
Nicolas Williams
2021-12-19 22:51:10 -06:00
parent 309d1192df
commit 823fb82477
14 changed files with 246 additions and 18 deletions
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26
lib/asn1/gen_template.c
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@@ -1063,6 +1063,8 @@ template_members(struct templatehead *temp,
Member *m;
size_t i = 0, typeididx = 0, opentypeidx = 0;
int is_array_of_open_type = 0;
int deco_opt;
char *ft, *fn;
if (isstruct && t->actual_parameter)
get_open_type_defn_fields(t, &typeidmember, &opentypemember,
@@ -1102,6 +1104,17 @@ template_members(struct templatehead *temp,
typeidfield, opentypefield, opentypemember,
is_array_of_open_type);
if (decorate_type(basetype, &ft, &fn, &deco_opt)) {
char *poffset2;
poffset2 = partial_offset(basetype, fn, 1, isstruct);
add_line_pointer(temp, ft, poffset2, "A1_OP_TYPE_DECORATE %s",
deco_opt ? "|A1_FLAG_OPTIONAL" : "");
free(poffset2);
free(ft);
free(fn);
}
if (isstruct)
template_names(temp, basetype, t);
break;
@@ -1114,6 +1127,8 @@ template_members(struct templatehead *temp,
Member *m;
size_t i = 0, typeididx = 0, opentypeidx = 0;
int is_array_of_open_type = 0;
int deco_opt;
char *ft, *fn;
if (isstruct && t->actual_parameter)
get_open_type_defn_fields(t, &typeidmember, &opentypemember,
@@ -1153,6 +1168,17 @@ template_members(struct templatehead *temp,
typeidfield, opentypefield, opentypemember,
is_array_of_open_type);
if (decorate_type(basetype, &ft, &fn, &deco_opt)) {
char *poffset2;
poffset2 = partial_offset(basetype, fn, 1, isstruct);
add_line_pointer(temp, ft, poffset2, "A1_OP_TYPE_DECORATE %s",
deco_opt ? "|A1_FLAG_OPTIONAL" : "");
free(poffset2);
free(ft);
free(fn);
}
if (isstruct)
template_names(temp, basetype, t);
break;