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Conf: Allow keywords to be redefined by user symbols

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Most syntactic constructs in BIRD configuration (e.g. protocol options)
are defined as keywords, which are distinct from symbols (user-defined
names for protocols, variables, ...). That may cause backwards
compatibility issue when a new feature is added, as it may collide with
existing user names.

We can allow keywords to be shadowed by symbols in almost all cases to
avoid this issue.

This replaces the previous mechanism, where shadowable symbols have to be
explictly added to kw_syms.
This commit is contained in:
Ondrej Zajicek 2022-12-13 19:31:46 +01:00
parent cce48c6cdd
commit f5140d1027
9 changed files with 20 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
conf/confbase.Y
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@ -119,7 +119,6 @@ CF_DECLS
%type <t> text opttext
%type <bs> bytestring
%type <s> symbol
%type <kw> kw_sym
%type <v> bytestring_text text_or_ipa
%type <x> bytestring_expr
@ -178,7 +177,7 @@ expr_us:
| expr US { $$ = $1 US_; }
;
symbol: CF_SYM_UNDEFINED | CF_SYM_KNOWN | kw_sym { $$ = cf_symbol_from_keyword($1); } ;
symbol: CF_SYM_UNDEFINED | CF_SYM_KNOWN | KEYWORD { $$ = cf_symbol_from_keyword($1); } ;
/* Switches */

1
conf/gen_keywords.m4
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@ -28,6 +28,7 @@ m4_divert(-1)')
m4_define(CF_keywd, `m4_ifdef([[CF_tok_$1]],,[[m4_define([[CF_tok_$1]],1)CF_handle_kw($1)]])')
m4_define(CF_KEYWORDS, `m4_define([[CF_toks]],[[]])CF_iterate([[CF_keywd]], [[$@]])m4_ifelse(CF_toks,,,%token[[]]CF_toks
)DNL')
m4_define(CF_KEYWORDS_EXCLUSIVE, `CF_KEYWORDS($@)')
# CLI commands generate keywords as well
m4_define(CF_CLI, `CF_KEYWORDS(m4_translit($1, [[ ]], [[,]]))

12
conf/gen_parser.m4
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@ -29,11 +29,17 @@ m4_define(CF_END, `m4_divert(-1)')
m4_define(CF_itera, `m4_ifelse($#, 1, [[CF_iter($1)]], [[CF_iter($1)[[]]CF_itera(m4_shift($@))]])')
m4_define(CF_iterate, `m4_define([[CF_iter]], m4_defn([[$1]]))CF_itera($2)')
m4_define(CF_append, `m4_define([[$1]], m4_ifdef([[$1]], m4_defn([[$1]])[[$3]])[[$2]])')
# Keywords act as %token<kw>
m4_define(CF_keywd, `m4_ifdef([[CF_tok_$1]],,[[m4_define([[CF_tok_$1]],1)m4_define([[CF_toks]],CF_toks $1)]])')
m4_define(CF_keywd, `m4_ifdef([[CF_tok_$1]],,[[m4_define([[CF_tok_$1]],1)CF_append([[CF_kw_rule]],$1,[[ | ]])m4_define([[CF_toks]],CF_toks $1)]])')
m4_define(CF_KEYWORDS, `m4_define([[CF_toks]],[[]])CF_iterate([[CF_keywd]], [[$@]])m4_ifelse(CF_toks,,,%token<kw>[[]]CF_toks
)DNL')
m4_define(CF_keywd2, `m4_ifdef([[CF_tok_$1]],,[[m4_define([[CF_tok_$1]],1)m4_define([[CF_toks]],CF_toks $1)]])')
m4_define(CF_KEYWORDS_EXCLUSIVE, `m4_define([[CF_toks]],[[]])CF_iterate([[CF_keywd2]], [[$@]])m4_ifelse(CF_toks,,,%token<kw>[[]]CF_toks
)DNL')
# CLI commands
m4_define(CF_CLI, `m4_define([[CF_cmd]], cmd_[[]]m4_translit($1, [[ ]], _))DNL
m4_divert(2)CF_KEYWORDS(m4_translit($1, [[ ]], [[,]]))
@ -55,7 +61,11 @@ m4_undivert(1)DNL
m4_undivert(2)DNL
%type <kw> KEYWORD
%%
KEYWORD: CF_kw_rule;
m4_undivert(3)DNL
%%

3
filter/config.Y
View File

@ -298,12 +298,13 @@ assert_assign(struct f_lval *lval, struct f_inst *expr, const char *start, const
CF_DECLS
CF_KEYWORDS_EXCLUSIVE(IN)
CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNSET, RETURN,
ACCEPT, REJECT, ERROR,
INT, BOOL, IP, TYPE, PREFIX, RD, PAIR, QUAD, EC, LC,
SET, STRING, BYTESTRING, BGPMASK, BGPPATH, CLIST, ECLIST, LCLIST,
IF, THEN, ELSE, CASE,
FOR, IN, DO,
FOR, DO,
TRUE, FALSE, RT, RO, UNKNOWN, GENERIC,
FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, DEST, IFNAME, IFINDEX, WEIGHT, GW_MPLS, ONLINK,
PREFERENCE,

4
nest/config.Y
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@ -154,8 +154,6 @@ CF_ENUM_PX(T_ENUM_AF, AF_, AFI_, IPV4, IPV6)
CF_GRAMMAR
kw_sym: MIN | MAX ;
/* Setting of router ID */
conf: rtrid ;
@ -842,7 +840,7 @@ sym_args:
| sym_args FILTER { $$ = $1; $$->type = SYM_FILTER; }
| sym_args PROTOCOL { $$ = $1; $$->type = SYM_PROTO; }
| sym_args TEMPLATE { $$ = $1; $$->type = SYM_TEMPLATE; }
| sym_args symbol { $$ = $1; $$->sym = $2; }
| sym_args CF_SYM_KNOWN { $$ = $1; $$->sym = $2; }
;

3
proto/bgp/config.Y
View File

@ -45,9 +45,6 @@ CF_KEYWORDS(CEASE, PREFIX, LIMIT, HIT, ADMINISTRATIVE, SHUTDOWN, RESET, PEER,
CF_GRAMMAR
/* Workaround for collisions between keywords and symbols */
kw_sym: ROLE | PEER | PROVIDER | CUSTOMER | RS_SERVER | RS_CLIENT ;
proto: bgp_proto '}' ;
bgp_proto_start: proto_start BGP {

3
proto/ospf/config.Y
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@ -190,7 +190,8 @@ ospf_check_auth(void)
CF_DECLS
CF_KEYWORDS(OSPF, V2, V3, OSPF_METRIC1, OSPF_METRIC2, OSPF_TAG, OSPF_ROUTER_ID)
CF_KEYWORDS_EXCLUSIVE(V2, V3)
CF_KEYWORDS(OSPF, OSPF_METRIC1, OSPF_METRIC2, OSPF_TAG, OSPF_ROUTER_ID)
CF_KEYWORDS(AREA, NEIGHBORS, RFC1583COMPAT, STUB, TICK, COST, COST2, RETRANSMIT)
CF_KEYWORDS(HELLO, TRANSMIT, PRIORITY, DEAD, TYPE, BROADCAST, BCAST, DEFAULT)
CF_KEYWORDS(NONBROADCAST, NBMA, POINTOPOINT, PTP, POINTOMULTIPOINT, PTMP)

2
proto/radv/config.Y
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@ -50,8 +50,6 @@ CF_ENUM(T_ENUM_RA_PREFERENCE, RA_PREF_, LOW, MEDIUM, HIGH)
CF_GRAMMAR
kw_sym: CUSTOM | OPTION | VALUE ;
proto: radv_proto ;
radv_proto_start: proto_start RADV

3
proto/rip/config.Y
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@ -32,7 +32,8 @@ rip_check_auth(void)
CF_DECLS
CF_KEYWORDS(RIP, NG, ECMP, LIMIT, WEIGHT, INFINITY, METRIC, UPDATE, TIMEOUT,
CF_KEYWORDS_EXCLUSIVE(NG)
CF_KEYWORDS(RIP, ECMP, LIMIT, WEIGHT, INFINITY, METRIC, UPDATE, TIMEOUT,
GARBAGE, RETRANSMIT, PORT, ADDRESS, MODE, BROADCAST, MULTICAST,
PASSIVE, VERSION, SPLIT, HORIZON, POISON, REVERSE, CHECK, ZERO,
TIME, BFD, AUTHENTICATION, NONE, PLAINTEXT, CRYPTOGRAPHIC, MD5,