ref: dfb4b522830edab8f3856289d326d6cf5e930644
dir: /sys/src/cmd/upas/smtp/smtpd.y/
%{
#include "common.h"
#include <ctype.h>
#include "smtpd.h"
#define YYMAXDEPTH 500 /* was default 150 */
#define YYSTYPE yystype
typedef struct quux yystype;
struct quux {
String *s;
int c;
};
Biobuf *yyfp;
YYSTYPE *bang;
extern Biobuf bin;
extern int debug;
YYSTYPE cat(YYSTYPE*, YYSTYPE*, YYSTYPE*, YYSTYPE*, YYSTYPE*, YYSTYPE*, YYSTYPE*);
int yyparse(void);
int yylex(void);
YYSTYPE anonymous(void);
%}
%term SPACE
%term CNTRL
%term CRLF
%start conversation
%%
conversation : cmd
| conversation cmd
;
cmd : error
| 'h' 'e' 'l' 'o' spaces sdomain CRLF
{ hello($6.s, 0); }
| 'e' 'h' 'l' 'o' spaces sdomain CRLF
{ hello($6.s, 1); }
| 'm' 'a' 'i' 'l' spaces 'f' 'r' 'o' 'm' ':' spath CRLF
{ sender($11.s); }
| 'm' 'a' 'i' 'l' spaces 'f' 'r' 'o' 'm' ':' spath spaces 'a' 'u' 't' 'h' '=' sauth CRLF
{ sender($11.s); }
| 'r' 'c' 'p' 't' spaces 't' 'o' ':' spath CRLF
{ receiver($9.s); }
| 'd' 'a' 't' 'a' CRLF
{ data(); }
| 'r' 's' 'e' 't' CRLF
{ reset(); }
| 's' 'e' 'n' 'd' spaces 'f' 'r' 'o' 'm' ':' spath CRLF
{ sender($11.s); }
| 's' 'o' 'm' 'l' spaces 'f' 'r' 'o' 'm' ':' spath CRLF
{ sender($11.s); }
| 's' 'a' 'm' 'l' spaces 'f' 'r' 'o' 'm' ':' spath CRLF
{ sender($11.s); }
| 'v' 'r' 'f' 'y' spaces string CRLF
{ verify($6.s); }
| 'e' 'x' 'p' 'n' spaces string CRLF
{ verify($6.s); }
| 'h' 'e' 'l' 'p' CRLF
{ help(0); }
| 'h' 'e' 'l' 'p' spaces string CRLF
{ help($6.s); }
| 'n' 'o' 'o' 'p' CRLF
{ noop(); }
| 'q' 'u' 'i' 't' CRLF
{ quit(); }
| 's' 't' 'a' 'r' 't' 't' 'l' 's' CRLF
{ starttls(); }
| 'a' 'u' 't' 'h' spaces name spaces string CRLF
{ auth($6.s, $8.s); }
| 'a' 'u' 't' 'h' spaces name CRLF
{ auth($6.s, nil); }
| CRLF
{ reply("500 5.5.1 illegal command or bad syntax\r\n"); }
;
path : '<' '>' ={ $$ = anonymous(); }
| '<' mailbox '>' ={ $$ = $2; }
| '<' a_d_l ':' mailbox '>' ={ $$ = cat(&$2, bang, &$4, 0, 0 ,0, 0); }
;
spath : path ={ $$ = $1; }
| spaces path ={ $$ = $2; }
;
auth : path ={ $$ = $1; }
| mailbox ={ $$ = $1; }
;
sauth : auth ={ $$ = $1; }
| spaces auth ={ $$ = $2; }
;
;
a_d_l : at_domain ={ $$ = cat(&$1, 0, 0, 0, 0 ,0, 0); }
| at_domain ',' a_d_l ={ $$ = cat(&$1, bang, &$3, 0, 0, 0, 0); }
;
at_domain : '@' domain ={ $$ = cat(&$2, 0, 0, 0, 0 ,0, 0); }
;
sdomain : domain ={ $$ = $1; }
| domain spaces ={ $$ = $1; }
;
domain : element ={ $$ = cat(&$1, 0, 0, 0, 0 ,0, 0); }
| element '.' ={ $$ = cat(&$1, 0, 0, 0, 0 ,0, 0); }
| element '.' domain ={ $$ = cat(&$1, &$2, &$3, 0, 0 ,0, 0); }
;
element : name ={ $$ = cat(&$1, 0, 0, 0, 0 ,0, 0); }
| '#' number ={ $$ = cat(&$1, &$2, 0, 0, 0 ,0, 0); }
| '[' ']' ={ $$ = cat(&$1, &$2, 0, 0, 0 ,0, 0); }
| '[' ipaddr ']' ={ $$ = cat(&$1, &$2, &$3, 0, 0 ,0, 0); }
;
mailbox : local_part ={ $$ = cat(&$1, 0, 0, 0, 0 ,0, 0); }
| local_part '@' domain ={ $$ = cat(&$3, bang, &$1, 0, 0 ,0, 0); }
;
local_part : dot_string ={ $$ = cat(&$1, 0, 0, 0, 0 ,0, 0); }
| quoted_string ={ $$ = cat(&$1, 0, 0, 0, 0 ,0, 0); }
;
name : let_dig ={ $$ = cat(&$1, 0, 0, 0, 0 ,0, 0); }
| let_dig ld_str ={ $$ = cat(&$1, &$2, 0, 0, 0 ,0, 0); }
| let_dig ldh_str ld_str ={ $$ = cat(&$1, &$2, &$3, 0, 0 ,0, 0); }
;
ld_str : let_dig
| let_dig ld_str ={ $$ = cat(&$1, &$2, 0, 0, 0 ,0, 0); }
;
ldh_str : hunder
| ld_str hunder ={ $$ = cat(&$1, &$2, 0, 0, 0 ,0, 0); }
| ldh_str ld_str hunder ={ $$ = cat(&$1, &$2, &$3, 0, 0 ,0, 0); }
;
let_dig : a
| d
;
dot_string : string ={ $$ = cat(&$1, 0, 0, 0, 0 ,0, 0); }
| string '.' dot_string ={ $$ = cat(&$1, &$2, &$3, 0, 0 ,0, 0); }
;
string : char ={ $$ = cat(&$1, 0, 0, 0, 0 ,0, 0); }
| string char ={ $$ = cat(&$1, &$2, 0, 0, 0 ,0, 0); }
;
quoted_string : '"' qtext '"' ={ $$ = cat(&$1, &$2, &$3, 0, 0 ,0, 0); }
;
qtext : '\\' x ={ $$ = cat(&$2, 0, 0, 0, 0 ,0, 0); }
| qtext '\\' x ={ $$ = cat(&$1, &$3, 0, 0, 0 ,0, 0); }
| q
| qtext q ={ $$ = cat(&$1, &$2, 0, 0, 0 ,0, 0); }
;
char : c
| '\\' x ={ $$ = $2; }
;
ipaddr : ipv4addr ={ $$ = cat(&$1, 0, 0, 0, 0, 0, 0); }
| 'i' 'p' 'v' '6' ':' ipv6addr ={ $$ = cat(&$6, 0, 0, 0, 0, 0, 0); }
;
ipv6addr : ipv6addr_list ={ $$ = cat(&$1, 0, 0, 0, 0, 0, 0); }
| ipv6addr_list ':' ':' ipv6addr_list ={ $$ = cat(&$1, &$2, &$3, &$4, 0, 0, 0); }
| ':' ':' ipv6addr_list ={ $$ = cat(&$1, &$2, &$3, 0, 0, 0, 0); }
;
ipv6addr_list : ipv6addr_elem ={ $$ = cat(&$1, 0, 0, 0, 0, 0, 0); }
| ipv6addr_list ':' ipv6addr_elem ={ $$ = cat(&$1, &$2, &$3, 0, 0, 0, 0); }
;
ipv6addr_elem : hnum ={ $$ = cat(&$1, 0, 0, 0, 0, 0, 0); }
| ipv4addr ={ $$ = cat(&$1, 0, 0, 0, 0, 0, 0); }
;
ipv4addr : snum '.' snum '.' snum '.' snum ={ $$ = cat(&$1, &$2, &$3, &$4, &$5, &$6, &$7); }
;
number : d ={ $$ = cat(&$1, 0, 0, 0, 0, 0, 0); }
| number d ={ $$ = cat(&$1, &$2, 0, 0, 0, 0, 0); }
;
snum : number ={ if(atoi(s_to_c($1.s)) > 255) fprint(2, "bad snum\n"); }
;
hnum : h ={ $$ = cat(&$1, 0, 0, 0, 0, 0, 0); }
| h h ={ $$ = cat(&$1, &$2, 0, 0, 0, 0, 0); }
| h h h ={ $$ = cat(&$1, &$2, &$3, 0, 0, 0, 0); }
| h h h h ={ $$ = cat(&$1, &$2, &$3, &$4, 0, 0, 0); }
;
spaces : SPACE ={ $$ = $1; }
| SPACE spaces ={ $$ = $1; }
;
hunder : '-' | '_'
;
special1 : CNTRL
| '(' | ')' | ',' | '.'
| ':' | ';' | '<' | '>' | '@'
;
special : special1 | '\\' | '"'
;
notspecial : '!' | '#' | '$' | '%' | '&' | '\''
| '*' | '+' | '-' | '/'
| '=' | '?'
| '[' | ']' | '^' | '_' | '`' | '{' | '|' | '}' | '~'
;
a : 'a' | 'b' | 'c' | 'd' | 'e' | 'f' | 'g' | 'h' | 'i'
| 'j' | 'k' | 'l' | 'm' | 'n' | 'o' | 'p' | 'q' | 'r'
| 's' | 't' | 'u' | 'v' | 'w' | 'x' | 'y' | 'z'
;
d : '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9'
;
h : d | 'a' | 'b' | 'c' | 'd' | 'e' | 'f'
;
c : a | d | notspecial
;
q : a | d | special1 | notspecial | SPACE
;
x : a | d | special | notspecial | SPACE
;
%%
void
parseinit(void)
{
bang = (YYSTYPE*)malloc(sizeof(YYSTYPE));
bang->c = '!';
bang->s = 0;
yyfp = &bin;
}
yylex(void)
{
int c;
for(;;){
c = Bgetc(yyfp);
if(c == -1)
return 0;
if(debug)
fprint(2, "%c", c);
yylval.c = c = c & 0x7F;
if(c == '\n'){
return CRLF;
}
if(c == '\r'){
c = Bgetc(yyfp);
if(c != '\n'){
Bungetc(yyfp);
c = '\r';
} else {
if(debug)
fprint(2, "%c", c);
return CRLF;
}
}
if(isalpha(c))
return tolower(c);
if(isspace(c))
return SPACE;
if(iscntrl(c))
return CNTRL;
return c;
}
}
YYSTYPE
cat(YYSTYPE *y1, YYSTYPE *y2, YYSTYPE *y3, YYSTYPE *y4, YYSTYPE *y5, YYSTYPE *y6, YYSTYPE *y7)
{
YYSTYPE rv;
if(y1->s)
rv.s = y1->s;
else {
rv.s = s_new();
s_putc(rv.s, y1->c);
s_terminate(rv.s);
}
if(y2){
if(y2->s){
s_append(rv.s, s_to_c(y2->s));
s_free(y2->s);
} else {
s_putc(rv.s, y2->c);
s_terminate(rv.s);
}
} else
return rv;
if(y3){
if(y3->s){
s_append(rv.s, s_to_c(y3->s));
s_free(y3->s);
} else {
s_putc(rv.s, y3->c);
s_terminate(rv.s);
}
} else
return rv;
if(y4){
if(y4->s){
s_append(rv.s, s_to_c(y4->s));
s_free(y4->s);
} else {
s_putc(rv.s, y4->c);
s_terminate(rv.s);
}
} else
return rv;
if(y5){
if(y5->s){
s_append(rv.s, s_to_c(y5->s));
s_free(y5->s);
} else {
s_putc(rv.s, y5->c);
s_terminate(rv.s);
}
} else
return rv;
if(y6){
if(y6->s){
s_append(rv.s, s_to_c(y6->s));
s_free(y6->s);
} else {
s_putc(rv.s, y6->c);
s_terminate(rv.s);
}
} else
return rv;
if(y7){
if(y7->s){
s_append(rv.s, s_to_c(y7->s));
s_free(y7->s);
} else {
s_putc(rv.s, y7->c);
s_terminate(rv.s);
}
} else
return rv;
return rv;
}
void
yyerror(char *x)
{
USED(x);
}
/*
* an anonymous user
*/
YYSTYPE
anonymous(void)
{
YYSTYPE rv;
rv.s = s_copy("/dev/null");
return rv;
}