static const response* chkdns_sender(str* sender, str* params)
{
str domstr, dbltxt;
int i;
unsigned char ansbuf[512];
if(sender->len == 0) return 0; /* bounce */
i = str_findlast(sender, '@');
if(i < 0) {
return &resp_badfrom; /* no domain */
}
str_init(&domstr);
str_copyb(&domstr, sender->s+i+1, sender->len-i-1);
if(domstr.len == 0) { /* null domain */
str_free(&domstr);
return &resp_badfrom;
}
/* first check dbl */
if(dblchk(&domstr, &dbltxt)) {
session_setenv("RBLSMTPD", dbltxt.s, 0);
session_setnum("dblfrom", 1);
session_setnum("sump", 1);
msg2("MAIL FROM in DBL ",dbltxt.s);
str_free(&domstr);
if(getenv("DBLREJECT")) {
resp_baddbl.message = dbltxt.s;
return &resp_baddbl;
}
return 0;
}
i = res_query(domstr.s, C_IN, T_MX, ansbuf, sizeof(ansbuf));
if(i > 0 && ((HEADER *)ansbuf)->ancount != 0) { /* has an MX */
str_free(&domstr);
return 0;
}
i = res_query(domstr.s, C_IN, T_A, ansbuf, sizeof(ansbuf));
if(i > 0 && ((HEADER *)ansbuf)->ancount != 0) { /* has an A */
str_free(&domstr);
return 0;
}
i = res_query(domstr.s, C_IN, T_AAAA, ansbuf, sizeof(ansbuf));
str_free(&domstr);
if(i > 0 && ((HEADER *)ansbuf)->ancount != 0) return 0; /* has an AAAA */
return &resp_badfrom;
(void)params;
}
static const response* get_seq(void)
{
str sql;
str_init(&sql);
/* do IPv6 differently */
if(strchr(remote_ip, ':')) {
if(!str_copy5s(&sql,
"INSERT INTO mail SET serial=NULL,mailtime=NULL,server6=INET_PTO6('",
local_ip,
"'),sourceip6=INET_PTO6('",
remote_ip,
"')")) return &resp_internal;
} else {
if(!str_copy5s(&sql,
"INSERT INTO mail SET serial=NULL,mailtime=NULL,server=INET_ATON('",
local_ip,
"'),sourceip=INET_ATON('",
remote_ip,
"')")) return &resp_internal;
}
if(!sqlquery(&sql, &sqlseq)
|| !str_init(&sqlseqstr)
|| !str_catu(&sqlseqstr, sqlseq)) return &resp_internal;
msg2("assigned seq ",sqlseqstr.s);
session_setnum("sqlseq", (unsigned long)sqlseq);
return 0;
}
static const response* chkdns_helo(str* hostname, str* capabilities)
{
str dbltxt;
/* hack, don't check numeric, guess from first character */
if(hostname->s[0] >= '0' && hostname->s[0] <= '9') return 0;
if(dblchk(hostname, &dbltxt)) {
session_setenv("RBLSMTPD", dbltxt.s, 0);
session_setnum("dblhelo", 1);
session_setnum("sump", 1);
msg4("HELO ", hostname->s, " in DBL ",dbltxt.s);
if(getenv("DBLREJECT")) {
resp_baddbl.message = dbltxt.s;
return &resp_baddbl;
}
}
return 0;
(void) capabilities;
}
static const response* apply_rule(const struct rule* rule)
{
const response* resp;
unsigned long maxdatabytes;
resp = build_response(rule->code, &rule->response);
apply_environment(&rule->environment);
maxdatabytes = session_getnum("maxdatabytes", ~0UL);
if (maxdatabytes == 0
|| (rule->databytes > 0
&& maxdatabytes > rule->databytes))
session_setnum("maxdatabytes", rule->databytes);
return resp;
}
static int cmd_STARTTLS(void)
{
if (!respond(&resp_start))
return 0;
if (!starttls())
return 0;
tls_available = 0;
session_setnum("tls_state", 1);
/* Remove UCSPITLS from environment to indicate it no longer available. */
unsetenv("UCSPITLS");
return 1;
}
