/* for STARTTLS responses */
static CURLcode smtp_state_starttls_resp(struct connectdata *conn,
int smtpcode,
smtpstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
(void)instate; /* no use for this yet */
if(smtpcode != 220) {
if(data->set.ftp_ssl != CURLUSESSL_TRY) {
failf(data, "STARTTLS denied. %c", smtpcode);
result = CURLE_LOGIN_DENIED;
}
else
result = smtp_authenticate(conn);
}
else {
/* Curl_ssl_connect is BLOCKING */
result = Curl_ssl_connect(conn, FIRSTSOCKET);
if(CURLE_OK == result) {
conn->protocol |= PROT_SMTPS;
result = smtp_state_ehlo(conn);
}
}
return result;
}
/* For STARTTLS responses */
static CURLcode smtp_state_starttls_resp(struct connectdata *conn,
int smtpcode,
smtpstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
(void)instate; /* no use for this yet */
if(smtpcode != 220) {
if(data->set.use_ssl != CURLUSESSL_TRY) {
failf(data, "STARTTLS denied. %c", smtpcode);
result = CURLE_USE_SSL_FAILED;
}
else
result = smtp_authenticate(conn);
}
else {
if(data->state.used_interface == Curl_if_multi) {
state(conn, SMTP_UPGRADETLS);
result = smtp_state_upgrade_tls(conn);
}
else {
result = Curl_ssl_connect(conn, FIRSTSOCKET);
if(CURLE_OK == result) {
smtp_to_smtps(conn);
result = smtp_state_ehlo(conn);
}
}
}
return result;
}
static CURLcode smtp_state_upgrade_tls(struct connectdata *conn)
{
struct smtp_conn *smtpc = &conn->proto.smtpc;
CURLcode result;
result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &smtpc->ssldone);
if(smtpc->ssldone) {
smtp_to_smtps(conn);
result = smtp_state_ehlo(conn);
}
return result;
}
/* For the initial server greeting */
static CURLcode smtp_state_servergreet_resp(struct connectdata *conn,
int smtpcode,
smtpstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
(void)instate; /* no use for this yet */
if(smtpcode/100 != 2) {
failf(data, "Got unexpected smtp-server response: %d", smtpcode);
return CURLE_FTP_WEIRD_SERVER_REPLY;
}
result = smtp_state_ehlo(conn);
return result;
}
static CURLcode smtp_state_upgrade_tls(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct smtp_conn *smtpc = &conn->proto.smtpc;
/* Start the SSL connection */
result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &smtpc->ssldone);
if(!result) {
if(smtpc->state != SMTP_UPGRADETLS)
state(conn, SMTP_UPGRADETLS);
if(smtpc->ssldone) {
smtp_to_smtps(conn);
result = smtp_state_ehlo(conn);
}
}
return result;
}
static CURLcode smtp_statemach_act(struct connectdata *conn)
{
CURLcode result;
curl_socket_t sock = conn->sock[FIRSTSOCKET];
struct SessionHandle *data=conn->data;
int smtpcode;
struct smtp_conn *smtpc = &conn->proto.smtpc;
struct pingpong *pp = &smtpc->pp;
size_t nread = 0;
if(pp->sendleft)
/* we have a piece of a command still left to send */
return Curl_pp_flushsend(pp);
/* we read a piece of response */
result = Curl_pp_readresp(sock, pp, &smtpcode, &nread);
if(result)
return result;
if(smtpcode) {
/* we have now received a full SMTP server response */
switch(smtpc->state) {
case SMTP_SERVERGREET:
if(smtpcode/100 != 2) {
failf(data, "Got unexpected smtp-server response: %d", smtpcode);
return CURLE_FTP_WEIRD_SERVER_REPLY;
}
result = smtp_state_ehlo(conn);
if(result)
return result;
break;
case SMTP_EHLO:
result = smtp_state_ehlo_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_HELO:
result = smtp_state_helo_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_STARTTLS:
result = smtp_state_starttls_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_AUTHPLAIN:
result = smtp_state_authplain_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_AUTHLOGIN:
result = smtp_state_authlogin_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_AUTHPASSWD:
result = smtp_state_authpasswd_resp(conn, smtpcode, smtpc->state);
break;
#ifndef CURL_DISABLE_CRYPTO_AUTH
case SMTP_AUTHCRAM:
result = smtp_state_authcram_resp(conn, smtpcode, smtpc->state);
break;
#endif
case SMTP_AUTH:
result = smtp_state_auth_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_MAIL:
result = smtp_state_mail_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_RCPT:
result = smtp_state_rcpt_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_DATA:
result = smtp_state_data_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_POSTDATA:
result = smtp_state_postdata_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_QUIT:
/* fallthrough, just stop! */
default:
/* internal error */
state(conn, SMTP_STOP);
break;
}
}
return result;
}
static CURLcode smtp_statemach_act(struct connectdata *conn)
{
CURLcode result;
curl_socket_t sock = conn->sock[FIRSTSOCKET];
struct SessionHandle *data=conn->data;
int smtpcode;
struct smtp_conn *smtpc = &conn->proto.smtpc;
struct pingpong *pp = &smtpc->pp;
size_t nread = 0;
if(pp->sendleft)
/* we have a piece of a command still left to send */
return Curl_pp_flushsend(pp);
/* we read a piece of response */
result = Curl_pp_readresp(sock, pp, &smtpcode, &nread);
if(result)
return result;
if(smtpcode) {
/* we have now received a full SMTP server response */
switch(smtpc->state) {
case SMTP_SERVERGREET:
if(smtpcode/100 != 2) {
failf(data, "Got unexpected smtp-server response: %d", smtpcode);
return CURLE_FTP_WEIRD_SERVER_REPLY;
}
if(data->set.ftp_ssl && !conn->ssl[FIRSTSOCKET].use) {
/* We don't have a SSL/TLS connection yet, but SSL is requested. Switch
to TLS connection now */
result = Curl_pp_sendf(&smtpc->pp, "STARTTLS", NULL);
state(conn, SMTP_STARTTLS);
}
else
result = smtp_state_ehlo(conn);
if(result)
return result;
break;
case SMTP_EHLO:
result = smtp_state_ehlo_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_MAIL:
result = smtp_state_mail_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_RCPT:
result = smtp_state_rcpt_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_STARTTLS:
result = smtp_state_starttls_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_DATA:
result = smtp_state_data_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_QUIT:
/* fallthrough, just stop! */
default:
/* internal error */
state(conn, SMTP_STOP);
break;
}
}
return result;
}
