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smtp.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2022, Daniel Stenberg, <[email protected]>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
* RFC1870 SMTP Service Extension for Message Size
* RFC2195 CRAM-MD5 authentication
* RFC2831 DIGEST-MD5 authentication
* RFC3207 SMTP over TLS
* RFC4422 Simple Authentication and Security Layer (SASL)
* RFC4616 PLAIN authentication
* RFC4752 The Kerberos V5 ("GSSAPI") SASL Mechanism
* RFC4954 SMTP Authentication
* RFC5321 SMTP protocol
* RFC5890 Internationalized Domain Names for Applications (IDNA)
* RFC6531 SMTP Extension for Internationalized Email
* RFC6532 Internationalized Email Headers
* RFC6749 OAuth 2.0 Authorization Framework
* RFC8314 Use of TLS for Email Submission and Access
* Draft SMTP URL Interface <draft-earhart-url-smtp-00.txt>
* Draft LOGIN SASL Mechanism <draft-murchison-sasl-login-00.txt>
*
***************************************************************************/
#include "curl_setup.h"
#ifndef CURL_DISABLE_SMTP
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_UTSNAME_H
#include <sys/utsname.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef __VMS
#include <in.h>
#include <inet.h>
#endif
#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
#undef in_addr_t
#define in_addr_t unsigned long
#endif
#include <curl/curl.h>
#include "urldata.h"
#include "sendf.h"
#include "hostip.h"
#include "progress.h"
#include "transfer.h"
#include "escape.h"
#include "http.h" /* for HTTP proxy tunnel stuff */
#include "mime.h"
#include "socks.h"
#include "smtp.h"
#include "strtoofft.h"
#include "strcase.h"
#include "vtls/vtls.h"
#include "cfilters.h"
#include "connect.h"
#include "select.h"
#include "multiif.h"
#include "url.h"
#include "curl_gethostname.h"
#include "bufref.h"
#include "curl_sasl.h"
#include "warnless.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
/* Local API functions */
static CURLcode smtp_regular_transfer(struct Curl_easy *data, bool *done);
static CURLcode smtp_do(struct Curl_easy *data, bool *done);
static CURLcode smtp_done(struct Curl_easy *data, CURLcode status,
bool premature);
static CURLcode smtp_connect(struct Curl_easy *data, bool *done);
static CURLcode smtp_disconnect(struct Curl_easy *data,
struct connectdata *conn, bool dead);
static CURLcode smtp_multi_statemach(struct Curl_easy *data, bool *done);
static int smtp_getsock(struct Curl_easy *data,
struct connectdata *conn, curl_socket_t *socks);
static CURLcode smtp_doing(struct Curl_easy *data, bool *dophase_done);
static CURLcode smtp_setup_connection(struct Curl_easy *data,
struct connectdata *conn);
static CURLcode smtp_parse_url_options(struct connectdata *conn);
static CURLcode smtp_parse_url_path(struct Curl_easy *data);
static CURLcode smtp_parse_custom_request(struct Curl_easy *data);
static CURLcode smtp_parse_address(struct Curl_easy *data, const char *fqma,
char **address, struct hostname *host);
static CURLcode smtp_perform_auth(struct Curl_easy *data, const char *mech,
const struct bufref *initresp);
static CURLcode smtp_continue_auth(struct Curl_easy *data, const char *mech,
const struct bufref *resp);
static CURLcode smtp_cancel_auth(struct Curl_easy *data, const char *mech);
static CURLcode smtp_get_message(struct Curl_easy *data, struct bufref *out);
/*
* SMTP protocol handler.
*/
const struct Curl_handler Curl_handler_smtp = {
"SMTP", /* scheme */
smtp_setup_connection, /* setup_connection */
smtp_do, /* do_it */
smtp_done, /* done */
ZERO_NULL, /* do_more */
smtp_connect, /* connect_it */
smtp_multi_statemach, /* connecting */
smtp_doing, /* doing */
smtp_getsock, /* proto_getsock */
smtp_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
smtp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_SMTP, /* defport */
CURLPROTO_SMTP, /* protocol */
CURLPROTO_SMTP, /* family */
PROTOPT_CLOSEACTION | PROTOPT_NOURLQUERY | /* flags */
PROTOPT_URLOPTIONS
};
#ifdef USE_SSL
/*
* SMTPS protocol handler.
*/
const struct Curl_handler Curl_handler_smtps = {
"SMTPS", /* scheme */
smtp_setup_connection, /* setup_connection */
smtp_do, /* do_it */
smtp_done, /* done */
ZERO_NULL, /* do_more */
smtp_connect, /* connect_it */
smtp_multi_statemach, /* connecting */
smtp_doing, /* doing */
smtp_getsock, /* proto_getsock */
smtp_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
smtp_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_SMTPS, /* defport */
CURLPROTO_SMTPS, /* protocol */
CURLPROTO_SMTP, /* family */
PROTOPT_CLOSEACTION | PROTOPT_SSL
| PROTOPT_NOURLQUERY | PROTOPT_URLOPTIONS /* flags */
};
#endif
/* SASL parameters for the smtp protocol */
static const struct SASLproto saslsmtp = {
"smtp", /* The service name */
smtp_perform_auth, /* Send authentication command */
smtp_continue_auth, /* Send authentication continuation */
smtp_cancel_auth, /* Cancel authentication */
smtp_get_message, /* Get SASL response message */
512 - 8, /* Max line len - strlen("AUTH ") - 1 space - crlf */
334, /* Code received when continuation is expected */
235, /* Code to receive upon authentication success */
SASL_AUTH_DEFAULT, /* Default mechanisms */
SASL_FLAG_BASE64 /* Configuration flags */
};
#ifdef USE_SSL
static void smtp_to_smtps(struct connectdata *conn)
{
/* Change the connection handler */
conn->handler = &Curl_handler_smtps;
/* Set the connection's upgraded to TLS flag */
conn->bits.tls_upgraded = TRUE;
}
#else
#define smtp_to_smtps(x) Curl_nop_stmt
#endif
/***********************************************************************
*
* smtp_endofresp()
*
* Checks for an ending SMTP status code at the start of the given string, but
* also detects various capabilities from the EHLO response including the
* supported authentication mechanisms.
*/
static bool smtp_endofresp(struct Curl_easy *data, struct connectdata *conn,
char *line, size_t len, int *resp)
{
struct smtp_conn *smtpc = &conn->proto.smtpc;
bool result = FALSE;
(void)data;
/* Nothing for us */
if(len < 4 || !ISDIGIT(line[0]) || !ISDIGIT(line[1]) || !ISDIGIT(line[2]))
return FALSE;
/* Do we have a command response? This should be the response code followed
by a space and optionally some text as per RFC-5321 and as outlined in
Section 4. Examples of RFC-4954 but some email servers ignore this and
only send the response code instead as per Section 4.2. */
if(line[3] == ' ' || len == 5) {
char tmpline[6];
result = TRUE;
memset(tmpline, '\0', sizeof(tmpline));
memcpy(tmpline, line, (len == 5 ? 5 : 3));
*resp = curlx_sltosi(strtol(tmpline, NULL, 10));
/* Make sure real server never sends internal value */
if(*resp == 1)
*resp = 0;
}
/* Do we have a multiline (continuation) response? */
else if(line[3] == '-' &&
(smtpc->state == SMTP_EHLO || smtpc->state == SMTP_COMMAND)) {
result = TRUE;
*resp = 1; /* Internal response code */
}
return result;
}
/***********************************************************************
*
* smtp_get_message()
*
* Gets the authentication message from the response buffer.
*/
static CURLcode smtp_get_message(struct Curl_easy *data, struct bufref *out)
{
char *message = data->state.buffer;
size_t len = strlen(message);
if(len > 4) {
/* Find the start of the message */
len -= 4;
for(message += 4; *message == ' ' || *message == '\t'; message++, len--)
;
/* Find the end of the message */
while(len--)
if(message[len] != '\r' && message[len] != '\n' && message[len] != ' ' &&
message[len] != '\t')
break;
/* Terminate the message */
message[++len] = '\0';
Curl_bufref_set(out, message, len, NULL);
}
else
/* junk input => zero length output */
Curl_bufref_set(out, "", 0, NULL);
return CURLE_OK;
}
/***********************************************************************
*
* state()
*
* This is the ONLY way to change SMTP state!
*/
static void state(struct Curl_easy *data, smtpstate newstate)
{
struct smtp_conn *smtpc = &data->conn->proto.smtpc;
#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
/* for debug purposes */
static const char * const names[] = {
"STOP",
"SERVERGREET",
"EHLO",
"HELO",
"STARTTLS",
"UPGRADETLS",
"AUTH",
"COMMAND",
"MAIL",
"RCPT",
"DATA",
"POSTDATA",
"QUIT",
/* LAST */
};
if(smtpc->state != newstate)
infof(data, "SMTP %p state change from %s to %s",
(void *)smtpc, names[smtpc->state], names[newstate]);
#endif
smtpc->state = newstate;
}
/***********************************************************************
*
* smtp_perform_ehlo()
*
* Sends the EHLO command to not only initialise communication with the ESMTP
* server but to also obtain a list of server side supported capabilities.
*/
static CURLcode smtp_perform_ehlo(struct Curl_easy *data)
{
CURLcode result = CURLE_OK;
struct connectdata *conn = data->conn;
struct smtp_conn *smtpc = &conn->proto.smtpc;
smtpc->sasl.authmechs = SASL_AUTH_NONE; /* No known auth. mechanism yet */
smtpc->sasl.authused = SASL_AUTH_NONE; /* Clear the authentication mechanism
used for esmtp connections */
smtpc->tls_supported = FALSE; /* Clear the TLS capability */
smtpc->auth_supported = FALSE; /* Clear the AUTH capability */
/* Send the EHLO command */
result = Curl_pp_sendf(data, &smtpc->pp, "EHLO %s", smtpc->domain);
if(!result)
state(data, SMTP_EHLO);
return result;
}
/***********************************************************************
*
* smtp_perform_helo()
*
* Sends the HELO command to initialise communication with the SMTP server.
*/
static CURLcode smtp_perform_helo(struct Curl_easy *data,
struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct smtp_conn *smtpc = &conn->proto.smtpc;
smtpc->sasl.authused = SASL_AUTH_NONE; /* No authentication mechanism used
in smtp connections */
/* Send the HELO command */
result = Curl_pp_sendf(data, &smtpc->pp, "HELO %s", smtpc->domain);
if(!result)
state(data, SMTP_HELO);
return result;
}
/***********************************************************************
*
* smtp_perform_starttls()
*
* Sends the STLS command to start the upgrade to TLS.
*/
static CURLcode smtp_perform_starttls(struct Curl_easy *data,
struct connectdata *conn)
{
/* Send the STARTTLS command */
CURLcode result = Curl_pp_sendf(data, &conn->proto.smtpc.pp,
"%s", "STARTTLS");
if(!result)
state(data, SMTP_STARTTLS);
return result;
}
/***********************************************************************
*
* smtp_perform_upgrade_tls()
*
* Performs the upgrade to TLS.
*/
static CURLcode smtp_perform_upgrade_tls(struct Curl_easy *data)
{
/* Start the SSL connection */
struct connectdata *conn = data->conn;
struct smtp_conn *smtpc = &conn->proto.smtpc;
CURLcode result;
if(!Curl_cfilter_ssl_added(data, conn, FIRSTSOCKET)) {
result = Curl_cfilter_ssl_add(data, conn, FIRSTSOCKET);
if(result)
goto out;
}
result = Curl_cfilter_connect(data, conn, FIRSTSOCKET,
FALSE, &smtpc->ssldone);
if(!result) {
if(smtpc->state != SMTP_UPGRADETLS)
state(data, SMTP_UPGRADETLS);
if(smtpc->ssldone) {
smtp_to_smtps(conn);
result = smtp_perform_ehlo(data);
}
}
out:
return result;
}
/***********************************************************************
*
* smtp_perform_auth()
*
* Sends an AUTH command allowing the client to login with the given SASL
* authentication mechanism.
*/
static CURLcode smtp_perform_auth(struct Curl_easy *data,
const char *mech,
const struct bufref *initresp)
{
CURLcode result = CURLE_OK;
struct smtp_conn *smtpc = &data->conn->proto.smtpc;
const char *ir = (const char *) Curl_bufref_ptr(initresp);
if(ir) { /* AUTH <mech> ...<crlf> */
/* Send the AUTH command with the initial response */
result = Curl_pp_sendf(data, &smtpc->pp, "AUTH %s %s", mech, ir);
}
else {
/* Send the AUTH command */
result = Curl_pp_sendf(data, &smtpc->pp, "AUTH %s", mech);
}
return result;
}
/***********************************************************************
*
* smtp_continue_auth()
*
* Sends SASL continuation data.
*/
static CURLcode smtp_continue_auth(struct Curl_easy *data,
const char *mech,
const struct bufref *resp)
{
struct smtp_conn *smtpc = &data->conn->proto.smtpc;
(void)mech;
return Curl_pp_sendf(data, &smtpc->pp,
"%s", (const char *) Curl_bufref_ptr(resp));
}
/***********************************************************************
*
* smtp_cancel_auth()
*
* Sends SASL cancellation.
*/
static CURLcode smtp_cancel_auth(struct Curl_easy *data, const char *mech)
{
struct smtp_conn *smtpc = &data->conn->proto.smtpc;
(void)mech;
return Curl_pp_sendf(data, &smtpc->pp, "*");
}
/***********************************************************************
*
* smtp_perform_authentication()
*
* Initiates the authentication sequence, with the appropriate SASL
* authentication mechanism.
*/
static CURLcode smtp_perform_authentication(struct Curl_easy *data)
{
CURLcode result = CURLE_OK;
struct connectdata *conn = data->conn;
struct smtp_conn *smtpc = &conn->proto.smtpc;
saslprogress progress;
/* Check we have enough data to authenticate with, and the
server supports authentication, and end the connect phase if not */
if(!smtpc->auth_supported ||
!Curl_sasl_can_authenticate(&smtpc->sasl, data)) {
state(data, SMTP_STOP);
return result;
}
/* Calculate the SASL login details */
result = Curl_sasl_start(&smtpc->sasl, data, FALSE, &progress);
if(!result) {
if(progress == SASL_INPROGRESS)
state(data, SMTP_AUTH);
else {
/* Other mechanisms not supported */
infof(data, "No known authentication mechanisms supported");
result = CURLE_LOGIN_DENIED;
}
}
return result;
}
/***********************************************************************
*
* smtp_perform_command()
*
* Sends a SMTP based command.
*/
static CURLcode smtp_perform_command(struct Curl_easy *data)
{
CURLcode result = CURLE_OK;
struct connectdata *conn = data->conn;
struct SMTP *smtp = data->req.p.smtp;
if(smtp->rcpt) {
/* We notify the server we are sending UTF-8 data if a) it supports the
SMTPUTF8 extension and b) The mailbox contains UTF-8 characters, in
either the local address or host name parts. This is regardless of
whether the host name is encoded using IDN ACE */
bool utf8 = FALSE;
if((!smtp->custom) || (!smtp->custom[0])) {
char *address = NULL;
struct hostname host = { NULL, NULL, NULL, NULL };
/* Parse the mailbox to verify into the local address and host name
parts, converting the host name to an IDN A-label if necessary */
result = smtp_parse_address(data, smtp->rcpt->data,
&address, &host);
if(result)
return result;
/* Establish whether we should report SMTPUTF8 to the server for this
mailbox as per RFC-6531 sect. 3.1 point 6 */
utf8 = (conn->proto.smtpc.utf8_supported) &&
((host.encalloc) || (!Curl_is_ASCII_name(address)) ||
(!Curl_is_ASCII_name(host.name)));
/* Send the VRFY command (Note: The host name part may be absent when the
host is a local system) */
result = Curl_pp_sendf(data, &conn->proto.smtpc.pp, "VRFY %s%s%s%s",
address,
host.name ? "@" : "",
host.name ? host.name : "",
utf8 ? " SMTPUTF8" : "");
Curl_free_idnconverted_hostname(&host);
free(address);
}
else {
/* Establish whether we should report that we support SMTPUTF8 for EXPN
commands to the server as per RFC-6531 sect. 3.1 point 6 */
utf8 = (conn->proto.smtpc.utf8_supported) &&
(!strcmp(smtp->custom, "EXPN"));
/* Send the custom recipient based command such as the EXPN command */
result = Curl_pp_sendf(data, &conn->proto.smtpc.pp,
"%s %s%s", smtp->custom,
smtp->rcpt->data,
utf8 ? " SMTPUTF8" : "");
}
}
else
/* Send the non-recipient based command such as HELP */
result = Curl_pp_sendf(data, &conn->proto.smtpc.pp, "%s",
smtp->custom && smtp->custom[0] != '\0' ?
smtp->custom : "HELP");
if(!result)
state(data, SMTP_COMMAND);
return result;
}
/***********************************************************************
*
* smtp_perform_mail()
*
* Sends an MAIL command to initiate the upload of a message.
*/
static CURLcode smtp_perform_mail(struct Curl_easy *data)
{
char *from = NULL;
char *auth = NULL;
char *size = NULL;
CURLcode result = CURLE_OK;
struct connectdata *conn = data->conn;
/* We notify the server we are sending UTF-8 data if a) it supports the
SMTPUTF8 extension and b) The mailbox contains UTF-8 characters, in
either the local address or host name parts. This is regardless of
whether the host name is encoded using IDN ACE */
bool utf8 = FALSE;
/* Calculate the FROM parameter */
if(data->set.str[STRING_MAIL_FROM]) {
char *address = NULL;
struct hostname host = { NULL, NULL, NULL, NULL };
/* Parse the FROM mailbox into the local address and host name parts,
converting the host name to an IDN A-label if necessary */
result = smtp_parse_address(data, data->set.str[STRING_MAIL_FROM],
&address, &host);
if(result)
return result;
/* Establish whether we should report SMTPUTF8 to the server for this
mailbox as per RFC-6531 sect. 3.1 point 4 and sect. 3.4 */
utf8 = (conn->proto.smtpc.utf8_supported) &&
((host.encalloc) || (!Curl_is_ASCII_name(address)) ||
(!Curl_is_ASCII_name(host.name)));
if(host.name) {
from = aprintf("<%s@%s>", address, host.name);
Curl_free_idnconverted_hostname(&host);
}
else
/* An invalid mailbox was provided but we'll simply let the server worry
about that and reply with a 501 error */
from = aprintf("<%s>", address);
free(address);
}
else
/* Null reverse-path, RFC-5321, sect. 3.6.3 */
from = strdup("<>");
if(!from)
return CURLE_OUT_OF_MEMORY;
/* Calculate the optional AUTH parameter */
if(data->set.str[STRING_MAIL_AUTH] && conn->proto.smtpc.sasl.authused) {
if(data->set.str[STRING_MAIL_AUTH][0] != '\0') {
char *address = NULL;
struct hostname host = { NULL, NULL, NULL, NULL };
/* Parse the AUTH mailbox into the local address and host name parts,
converting the host name to an IDN A-label if necessary */
result = smtp_parse_address(data, data->set.str[STRING_MAIL_AUTH],
&address, &host);
if(result) {
free(from);
return result;
}
/* Establish whether we should report SMTPUTF8 to the server for this
mailbox as per RFC-6531 sect. 3.1 point 4 and sect. 3.4 */
if((!utf8) && (conn->proto.smtpc.utf8_supported) &&
((host.encalloc) || (!Curl_is_ASCII_name(address)) ||
(!Curl_is_ASCII_name(host.name))))
utf8 = TRUE;
if(host.name) {
auth = aprintf("<%s@%s>", address, host.name);
Curl_free_idnconverted_hostname(&host);
}
else
/* An invalid mailbox was provided but we'll simply let the server
worry about it */
auth = aprintf("<%s>", address);
free(address);
}
else
/* Empty AUTH, RFC-2554, sect. 5 */
auth = strdup("<>");
if(!auth) {
free(from);
return CURLE_OUT_OF_MEMORY;
}
}
/* Prepare the mime data if some. */
if(data->set.mimepost.kind != MIMEKIND_NONE) {
/* Use the whole structure as data. */
data->set.mimepost.flags &= ~MIME_BODY_ONLY;
/* Add external headers and mime version. */
curl_mime_headers(&data->set.mimepost, data->set.headers, 0);
result = Curl_mime_prepare_headers(&data->set.mimepost, NULL,
NULL, MIMESTRATEGY_MAIL);
if(!result)
if(!Curl_checkheaders(data, STRCONST("Mime-Version")))
result = Curl_mime_add_header(&data->set.mimepost.curlheaders,
"Mime-Version: 1.0");
/* Make sure we will read the entire mime structure. */
if(!result)
result = Curl_mime_rewind(&data->set.mimepost);
if(result) {
free(from);
free(auth);
return result;
}
data->state.infilesize = Curl_mime_size(&data->set.mimepost);
/* Read from mime structure. */
data->state.fread_func = (curl_read_callback) Curl_mime_read;
data->state.in = (void *) &data->set.mimepost;
}
/* Calculate the optional SIZE parameter */
if(conn->proto.smtpc.size_supported && data->state.infilesize > 0) {
size = aprintf("%" CURL_FORMAT_CURL_OFF_T, data->state.infilesize);
if(!size) {
free(from);
free(auth);
return CURLE_OUT_OF_MEMORY;
}
}
/* If the mailboxes in the FROM and AUTH parameters don't include a UTF-8
based address then quickly scan through the recipient list and check if
any there do, as we need to correctly identify our support for SMTPUTF8
in the envelope, as per RFC-6531 sect. 3.4 */
if(conn->proto.smtpc.utf8_supported && !utf8) {
struct SMTP *smtp = data->req.p.smtp;
struct curl_slist *rcpt = smtp->rcpt;
while(rcpt && !utf8) {
/* Does the host name contain non-ASCII characters? */
if(!Curl_is_ASCII_name(rcpt->data))
utf8 = TRUE;
rcpt = rcpt->next;
}
}
/* Send the MAIL command */
result = Curl_pp_sendf(data, &conn->proto.smtpc.pp,
"MAIL FROM:%s%s%s%s%s%s",
from, /* Mandatory */
auth ? " AUTH=" : "", /* Optional on AUTH support */
auth ? auth : "", /* */
size ? " SIZE=" : "", /* Optional on SIZE support */
size ? size : "", /* */
utf8 ? " SMTPUTF8" /* Internationalised mailbox */
: ""); /* included in our envelope */
free(from);
free(auth);
free(size);
if(!result)
state(data, SMTP_MAIL);
return result;
}
/***********************************************************************
*
* smtp_perform_rcpt_to()
*
* Sends a RCPT TO command for a given recipient as part of the message upload
* process.
*/
static CURLcode smtp_perform_rcpt_to(struct Curl_easy *data)
{
CURLcode result = CURLE_OK;
struct connectdata *conn = data->conn;
struct SMTP *smtp = data->req.p.smtp;
char *address = NULL;
struct hostname host = { NULL, NULL, NULL, NULL };
/* Parse the recipient mailbox into the local address and host name parts,
converting the host name to an IDN A-label if necessary */
result = smtp_parse_address(data, smtp->rcpt->data,
&address, &host);
if(result)
return result;
/* Send the RCPT TO command */
if(host.name)
result = Curl_pp_sendf(data, &conn->proto.smtpc.pp, "RCPT TO:<%s@%s>",
address, host.name);
else
/* An invalid mailbox was provided but we'll simply let the server worry
about that and reply with a 501 error */
result = Curl_pp_sendf(data, &conn->proto.smtpc.pp, "RCPT TO:<%s>",
address);
Curl_free_idnconverted_hostname(&host);
free(address);
if(!result)
state(data, SMTP_RCPT);
return result;
}
/***********************************************************************
*
* smtp_perform_quit()
*
* Performs the quit action prior to sclose() being called.
*/
static CURLcode smtp_perform_quit(struct Curl_easy *data,
struct connectdata *conn)
{
/* Send the QUIT command */
CURLcode result = Curl_pp_sendf(data, &conn->proto.smtpc.pp, "%s", "QUIT");
if(!result)
state(data, SMTP_QUIT);
return result;
}
/* For the initial server greeting */
static CURLcode smtp_state_servergreet_resp(struct Curl_easy *data,
int smtpcode,
smtpstate instate)
{
CURLcode result = CURLE_OK;
(void)instate; /* no use for this yet */
if(smtpcode/100 != 2) {
failf(data, "Got unexpected smtp-server response: %d", smtpcode);
result = CURLE_WEIRD_SERVER_REPLY;
}
else
result = smtp_perform_ehlo(data);
return result;
}
/* For STARTTLS responses */
static CURLcode smtp_state_starttls_resp(struct Curl_easy *data,
int smtpcode,
smtpstate instate)
{
CURLcode result = CURLE_OK;
(void)instate; /* no use for this yet */
/* Pipelining in response is forbidden. */
if(data->conn->proto.smtpc.pp.cache_size)
return CURLE_WEIRD_SERVER_REPLY;
if(smtpcode != 220) {
if(data->set.use_ssl != CURLUSESSL_TRY) {
failf(data, "STARTTLS denied, code %d", smtpcode);
result = CURLE_USE_SSL_FAILED;
}
else
result = smtp_perform_authentication(data);
}
else
result = smtp_perform_upgrade_tls(data);
return result;
}
/* For EHLO responses */
static CURLcode smtp_state_ehlo_resp(struct Curl_easy *data,
struct connectdata *conn, int smtpcode,
smtpstate instate)
{
CURLcode result = CURLE_OK;
struct smtp_conn *smtpc = &conn->proto.smtpc;
const char *line = data->state.buffer;
size_t len = strlen(line);
(void)instate; /* no use for this yet */
if(smtpcode/100 != 2 && smtpcode != 1) {
if(data->set.use_ssl <= CURLUSESSL_TRY || Curl_ssl_use(conn, FIRSTSOCKET))
result = smtp_perform_helo(data, conn);
else {
failf(data, "Remote access denied: %d", smtpcode);
result = CURLE_REMOTE_ACCESS_DENIED;
}
}
else if(len >= 4) {
line += 4;
len -= 4;
/* Does the server support the STARTTLS capability? */
if(len >= 8 && !memcmp(line, "STARTTLS", 8))
smtpc->tls_supported = TRUE;
/* Does the server support the SIZE capability? */
else if(len >= 4 && !memcmp(line, "SIZE", 4))
smtpc->size_supported = TRUE;
/* Does the server support the UTF-8 capability? */
else if(len >= 8 && !memcmp(line, "SMTPUTF8", 8))
smtpc->utf8_supported = TRUE;
/* Does the server support authentication? */
else if(len >= 5 && !memcmp(line, "AUTH ", 5)) {
smtpc->auth_supported = TRUE;
/* Advance past the AUTH keyword */
line += 5;
len -= 5;
/* Loop through the data line */
for(;;) {
size_t llen;
size_t wordlen;
unsigned short mechbit;
while(len &&
(*line == ' ' || *line == '\t' ||
*line == '\r' || *line == '\n')) {
line++;
len--;
}
if(!len)
break;
/* Extract the word */
for(wordlen = 0; wordlen < len && line[wordlen] != ' ' &&
line[wordlen] != '\t' && line[wordlen] != '\r' &&
line[wordlen] != '\n';)
wordlen++;
/* Test the word for a matching authentication mechanism */
mechbit = Curl_sasl_decode_mech(line, wordlen, &llen);
if(mechbit && llen == wordlen)
smtpc->sasl.authmechs |= mechbit;
line += wordlen;
len -= wordlen;
}
}
if(smtpcode != 1) {
if(data->set.use_ssl && !Curl_ssl_use(conn, FIRSTSOCKET)) {
/* We don't have a SSL/TLS connection yet, but SSL is requested */
if(smtpc->tls_supported)
/* Switch to TLS connection now */
result = smtp_perform_starttls(data, conn);
else if(data->set.use_ssl == CURLUSESSL_TRY)
/* Fallback and carry on with authentication */
result = smtp_perform_authentication(data);
else {
failf(data, "STARTTLS not supported.");
result = CURLE_USE_SSL_FAILED;
}
}
else
result = smtp_perform_authentication(data);
}
}
else {
failf(data, "Unexpectedly short EHLO response");
result = CURLE_WEIRD_SERVER_REPLY;
}
return result;
}
/* For HELO responses */
static CURLcode smtp_state_helo_resp(struct Curl_easy *data, int smtpcode,
smtpstate instate)
{
CURLcode result = CURLE_OK;
(void)instate; /* no use for this yet */
if(smtpcode/100 != 2) {
failf(data, "Remote access denied: %d", smtpcode);
result = CURLE_REMOTE_ACCESS_DENIED;
}
else
/* End of connect phase */