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|
%{
/**
* \file parser.y
* Parser for the rcfile.
*
* \author Adapted from fetchmail's rcfile_y.y by José Fonseca
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libesmtp.h>
#include "main.h"
#include "smtp.h"
#include "local.h"
#include "xmalloc.h"
/** Path name of dot file */
static const char *rcfile = NULL;
int yydebug; /**< in case we didn't generate with -- debug */
static identity_t *identity = NULL;
/**
* Utility macro to set the default identity, if one isn't set yet.
*
* It's necessary for compatability with older configurations files where the
* default identity was defined in a global section, instead of defined by the
* 'default' or the first defined identity, if no 'default' keyword is given.
*/
#define SET_DEFAULT_IDENTITY \
do { \
if(!default_identity) \
default_identity = identity; \
} while(0)
/* using Bison, this arranges that yydebug messages will show actual tokens */
extern char * yytext;
#define YYPRINT(fp, type, val) fprintf(fp, " = \"%s\"", yytext)
void yyerror (const char *s);
%}
%union {
int number;
char *sval;
}
%token IDENTITY DEFAULT HOSTNAME USERNAME PASSWORD STARTTLS CERTIFICATE_PASSPHRASE PRECONNECT MDA
%token MAP
%token DISABLED ENABLED REQUIRED
%token <sval> STRING
%token <number> NUMBER
%%
rcfile : /* empty */
| statement_list
| statement_list identity_list
| identity_list
;
identity_list : identity
| identity statement_list
| identity_list identity statement_list
;
map : /* empty */
| MAP
;
identity : IDENTITY map STRING
{
identity = identity_new();
identity_add(identity);
identity->address = xstrdup($3);
}
;
statement_list : statement
| statement_list statement
;
/* future global options should also have the form SET <name> optmap <value> */
statement : HOSTNAME map STRING { identity->host = xstrdup($3); SET_DEFAULT_IDENTITY; }
| USERNAME map STRING { identity->user = xstrdup($3); SET_DEFAULT_IDENTITY; }
| PASSWORD map STRING { identity->pass = xstrdup($3); SET_DEFAULT_IDENTITY; }
| STARTTLS map DISABLED { identity->starttls = Starttls_DISABLED; SET_DEFAULT_IDENTITY; }
| STARTTLS map ENABLED { identity->starttls = Starttls_ENABLED; SET_DEFAULT_IDENTITY; }
| STARTTLS map REQUIRED { identity->starttls = Starttls_REQUIRED; SET_DEFAULT_IDENTITY; }
| CERTIFICATE_PASSPHRASE map STRING { identity->certificate_passphrase = xstrdup($3); SET_DEFAULT_IDENTITY; }
| PRECONNECT map STRING { identity->preconnect = xstrdup($3); SET_DEFAULT_IDENTITY; }
| MDA map STRING { mda = xstrdup($3); }
| DEFAULT { default_identity = identity; }
;
%%
/* lexer interface */
extern int lineno;
extern char *yytext;
extern FILE *yyin;
/**
* Report a syntax error.
*/
void yyerror (const char *s)
{
fprintf(stderr, "%s:%d: %s at %s\n", rcfile, lineno, s,
(yytext && yytext[0]) ? yytext : "end of input");
exit(EX_CONFIG);
}
#define RCFILE "esmtprc"
#define DOT_RCFILE "." RCFILE
#define ETC_RCFILE "/etc/" RCFILE
void rcfile_parse(const char *_rcfile)
{
char *temp = NULL;
if(_rcfile)
{
/* Configuration file specified on the command line */
if(!(yyin = fopen(_rcfile, "r")))
goto failure;
rcfile = _rcfile;
goto success;
}
/* Search for the user configuration file */
do
{
char *home;
if (!(home = getenv("HOME")))
break;
temp = xmalloc(strlen(home) + strlen(DOT_RCFILE) + 2);
strcpy(temp, home);
if (temp[strlen(temp) - 1] != '/')
strcat(temp, "/");
strcat(temp, DOT_RCFILE);
if(!(yyin = fopen(temp, "r")))
{
if(errno == ENOENT)
break;
else
goto failure;
}
rcfile = temp;
goto success;
}
while(0);
/* Search for the global configuration file */
do {
if(!(yyin = fopen(ETC_RCFILE, "r")))
{
if(errno == ENOENT)
break;
else
goto failure;
}
rcfile = ETC_RCFILE;
goto success;
}
while(0);
/* No configuration file found */
return;
success:
/* Configuration file opened */
identity = identity_new();
identity_add(identity);
yyparse(); /* parse entire file */
SET_DEFAULT_IDENTITY;
fclose(yyin); /* not checking this should be safe, file mode was r */
rcfile = NULL;
if(temp)
free(temp);
return;
failure:
/* Failure to open the configuration file */
fprintf(stderr, "open: %s: %s\n", rcfile, strerror(errno));
exit(EX_CONFIG);
}
/* easier to do this than cope with variations in where the library lives */
int yywrap(void) { return 1; }
|
