mirror of
https://github.com/moparisthebest/curl
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0d24f64473
Its use is only enabled by explicit requirement in URL (;AUTH=EXTERNAL) and by not setting the password.
1675 lines
47 KiB
C
1675 lines
47 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* RFC1870 SMTP Service Extension for Message Size
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* RFC2195 CRAM-MD5 authentication
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* RFC2831 DIGEST-MD5 authentication
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* RFC3207 SMTP over TLS
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* RFC4422 Simple Authentication and Security Layer (SASL)
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* RFC4616 PLAIN authentication
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* RFC4752 The Kerberos V5 ("GSSAPI") SASL Mechanism
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* RFC4954 SMTP Authentication
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* RFC5321 SMTP protocol
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* RFC6749 OAuth 2.0 Authorization Framework
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* Draft SMTP URL Interface <draft-earhart-url-smtp-00.txt>
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* Draft LOGIN SASL Mechanism <draft-murchison-sasl-login-00.txt>
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*
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***************************************************************************/
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#include "curl_setup.h"
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#ifndef CURL_DISABLE_SMTP
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#ifdef HAVE_UTSNAME_H
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#include <sys/utsname.h>
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#endif
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#ifdef __VMS
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#include <in.h>
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#include <inet.h>
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#endif
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#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
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#undef in_addr_t
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#define in_addr_t unsigned long
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#endif
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#include <curl/curl.h>
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#include "urldata.h"
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#include "sendf.h"
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#include "hostip.h"
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#include "progress.h"
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#include "transfer.h"
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#include "escape.h"
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#include "http.h" /* for HTTP proxy tunnel stuff */
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#include "socks.h"
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#include "smtp.h"
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#include "strtoofft.h"
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#include "strequal.h"
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#include "vtls/vtls.h"
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#include "connect.h"
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#include "strerror.h"
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#include "select.h"
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#include "multiif.h"
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#include "url.h"
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#include "rawstr.h"
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#include "curl_gethostname.h"
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#include "curl_sasl.h"
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#include "warnless.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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#include "curl_memory.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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/* Local API functions */
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static CURLcode smtp_regular_transfer(struct connectdata *conn, bool *done);
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static CURLcode smtp_do(struct connectdata *conn, bool *done);
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static CURLcode smtp_done(struct connectdata *conn, CURLcode status,
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bool premature);
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static CURLcode smtp_connect(struct connectdata *conn, bool *done);
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static CURLcode smtp_disconnect(struct connectdata *conn, bool dead);
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static CURLcode smtp_multi_statemach(struct connectdata *conn, bool *done);
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static int smtp_getsock(struct connectdata *conn, curl_socket_t *socks,
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int numsocks);
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static CURLcode smtp_doing(struct connectdata *conn, bool *dophase_done);
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static CURLcode smtp_setup_connection(struct connectdata *conn);
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static CURLcode smtp_parse_url_options(struct connectdata *conn);
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static CURLcode smtp_parse_url_path(struct connectdata *conn);
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static CURLcode smtp_parse_custom_request(struct connectdata *conn);
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static CURLcode smtp_perform_auth(struct connectdata *conn, const char *mech,
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const char *initresp);
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static CURLcode smtp_continue_auth(struct connectdata *conn, const char *resp);
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static void smtp_get_message(char *buffer, char** outptr);
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/*
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* SMTP protocol handler.
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*/
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const struct Curl_handler Curl_handler_smtp = {
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"SMTP", /* scheme */
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smtp_setup_connection, /* setup_connection */
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smtp_do, /* do_it */
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smtp_done, /* done */
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ZERO_NULL, /* do_more */
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smtp_connect, /* connect_it */
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smtp_multi_statemach, /* connecting */
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smtp_doing, /* doing */
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smtp_getsock, /* proto_getsock */
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smtp_getsock, /* doing_getsock */
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ZERO_NULL, /* domore_getsock */
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ZERO_NULL, /* perform_getsock */
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smtp_disconnect, /* disconnect */
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ZERO_NULL, /* readwrite */
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PORT_SMTP, /* defport */
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CURLPROTO_SMTP, /* protocol */
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PROTOPT_CLOSEACTION | PROTOPT_NOURLQUERY /* flags */
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};
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#ifdef USE_SSL
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/*
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* SMTPS protocol handler.
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*/
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const struct Curl_handler Curl_handler_smtps = {
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"SMTPS", /* scheme */
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smtp_setup_connection, /* setup_connection */
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smtp_do, /* do_it */
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smtp_done, /* done */
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ZERO_NULL, /* do_more */
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smtp_connect, /* connect_it */
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smtp_multi_statemach, /* connecting */
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smtp_doing, /* doing */
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smtp_getsock, /* proto_getsock */
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smtp_getsock, /* doing_getsock */
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ZERO_NULL, /* domore_getsock */
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ZERO_NULL, /* perform_getsock */
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smtp_disconnect, /* disconnect */
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ZERO_NULL, /* readwrite */
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PORT_SMTPS, /* defport */
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CURLPROTO_SMTPS, /* protocol */
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PROTOPT_CLOSEACTION | PROTOPT_SSL
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| PROTOPT_NOURLQUERY /* flags */
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};
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#endif
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#ifndef CURL_DISABLE_HTTP
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/*
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* HTTP-proxyed SMTP protocol handler.
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*/
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static const struct Curl_handler Curl_handler_smtp_proxy = {
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"SMTP", /* scheme */
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Curl_http_setup_conn, /* setup_connection */
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Curl_http, /* do_it */
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Curl_http_done, /* done */
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ZERO_NULL, /* do_more */
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ZERO_NULL, /* connect_it */
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ZERO_NULL, /* connecting */
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ZERO_NULL, /* doing */
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ZERO_NULL, /* proto_getsock */
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ZERO_NULL, /* doing_getsock */
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ZERO_NULL, /* domore_getsock */
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ZERO_NULL, /* perform_getsock */
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ZERO_NULL, /* disconnect */
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ZERO_NULL, /* readwrite */
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PORT_SMTP, /* defport */
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CURLPROTO_HTTP, /* protocol */
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PROTOPT_NONE /* flags */
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};
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#ifdef USE_SSL
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/*
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* HTTP-proxyed SMTPS protocol handler.
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*/
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static const struct Curl_handler Curl_handler_smtps_proxy = {
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"SMTPS", /* scheme */
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Curl_http_setup_conn, /* setup_connection */
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Curl_http, /* do_it */
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Curl_http_done, /* done */
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ZERO_NULL, /* do_more */
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ZERO_NULL, /* connect_it */
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ZERO_NULL, /* connecting */
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ZERO_NULL, /* doing */
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ZERO_NULL, /* proto_getsock */
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ZERO_NULL, /* doing_getsock */
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ZERO_NULL, /* domore_getsock */
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ZERO_NULL, /* perform_getsock */
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ZERO_NULL, /* disconnect */
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ZERO_NULL, /* readwrite */
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PORT_SMTPS, /* defport */
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CURLPROTO_HTTP, /* protocol */
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PROTOPT_NONE /* flags */
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};
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#endif
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#endif
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/* SASL parameters for the smtp protocol */
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static const struct SASLproto saslsmtp = {
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"smtp", /* The service name */
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334, /* Code received when continuation is expected */
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235, /* Code to receive upon authentication success */
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512 - 8, /* Maximum initial response length (no max) */
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smtp_perform_auth, /* Send authentication command */
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smtp_continue_auth, /* Send authentication continuation */
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smtp_get_message /* Get SASL response message */
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};
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#ifdef USE_SSL
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static void smtp_to_smtps(struct connectdata *conn)
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{
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conn->handler = &Curl_handler_smtps;
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}
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#else
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#define smtp_to_smtps(x) Curl_nop_stmt
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#endif
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/***********************************************************************
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*
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* smtp_endofresp()
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*
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* Checks for an ending SMTP status code at the start of the given string, but
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* also detects various capabilities from the EHLO response including the
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* supported authentication mechanisms.
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*/
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static bool smtp_endofresp(struct connectdata *conn, char *line, size_t len,
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int *resp)
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{
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struct smtp_conn *smtpc = &conn->proto.smtpc;
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bool result = FALSE;
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/* Nothing for us */
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if(len < 4 || !ISDIGIT(line[0]) || !ISDIGIT(line[1]) || !ISDIGIT(line[2]))
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return FALSE;
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/* Do we have a command response? This should be the response code followed
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by a space and optionally some text as per RFC-5321 and as outlined in
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Section 4. Examples of RFC-4954 but some e-mail servers ignore this and
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only send the response code instead as per Section 4.2. */
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if(line[3] == ' ' || len == 5) {
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result = TRUE;
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*resp = curlx_sltosi(strtol(line, NULL, 10));
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/* Make sure real server never sends internal value */
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if(*resp == 1)
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*resp = 0;
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}
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/* Do we have a multiline (continuation) response? */
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else if(line[3] == '-' &&
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(smtpc->state == SMTP_EHLO || smtpc->state == SMTP_COMMAND)) {
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result = TRUE;
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*resp = 1; /* Internal response code */
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}
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return result;
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}
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/***********************************************************************
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*
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* smtp_get_message()
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*
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* Gets the authentication message from the response buffer.
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*/
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static void smtp_get_message(char *buffer, char** outptr)
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{
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size_t len = 0;
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char* message = NULL;
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/* Find the start of the message */
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for(message = buffer + 4; *message == ' ' || *message == '\t'; message++)
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;
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/* Find the end of the message */
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for(len = strlen(message); len--;)
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if(message[len] != '\r' && message[len] != '\n' && message[len] != ' ' &&
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message[len] != '\t')
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break;
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/* Terminate the message */
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if(++len) {
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message[len] = '\0';
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}
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*outptr = message;
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}
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/***********************************************************************
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*
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* state()
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*
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* This is the ONLY way to change SMTP state!
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*/
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static void state(struct connectdata *conn, smtpstate newstate)
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{
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struct smtp_conn *smtpc = &conn->proto.smtpc;
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#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
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/* for debug purposes */
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static const char * const names[] = {
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"STOP",
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"SERVERGREET",
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"EHLO",
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"HELO",
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"STARTTLS",
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"UPGRADETLS",
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"AUTH",
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"COMMAND",
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"MAIL",
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"RCPT",
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"DATA",
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"POSTDATA",
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"QUIT",
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/* LAST */
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};
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if(smtpc->state != newstate)
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infof(conn->data, "SMTP %p state change from %s to %s\n",
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(void *)smtpc, names[smtpc->state], names[newstate]);
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#endif
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smtpc->state = newstate;
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}
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/***********************************************************************
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*
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* smtp_perform_ehlo()
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*
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* Sends the EHLO command to not only initialise communication with the ESMTP
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* server but to also obtain a list of server side supported capabilities.
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*/
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static CURLcode smtp_perform_ehlo(struct connectdata *conn)
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{
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CURLcode result = CURLE_OK;
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struct smtp_conn *smtpc = &conn->proto.smtpc;
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smtpc->sasl.authmechs = SASL_AUTH_NONE; /* No known auth. mechanism yet */
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smtpc->sasl.authused = SASL_AUTH_NONE; /* Clear the authentication mechanism
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used for esmtp connections */
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smtpc->tls_supported = FALSE; /* Clear the TLS capability */
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smtpc->auth_supported = FALSE; /* Clear the AUTH capability */
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/* Send the EHLO command */
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result = Curl_pp_sendf(&smtpc->pp, "EHLO %s", smtpc->domain);
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if(!result)
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state(conn, SMTP_EHLO);
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return result;
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}
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/***********************************************************************
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*
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* smtp_perform_helo()
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*
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* Sends the HELO command to initialise communication with the SMTP server.
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*/
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static CURLcode smtp_perform_helo(struct connectdata *conn)
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{
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CURLcode result = CURLE_OK;
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struct smtp_conn *smtpc = &conn->proto.smtpc;
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smtpc->sasl.authused = SASL_AUTH_NONE; /* No authentication mechanism used
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in smtp connections */
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/* Send the HELO command */
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result = Curl_pp_sendf(&smtpc->pp, "HELO %s", smtpc->domain);
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if(!result)
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state(conn, SMTP_HELO);
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return result;
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}
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/***********************************************************************
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*
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* smtp_perform_starttls()
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*
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* Sends the STLS command to start the upgrade to TLS.
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*/
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static CURLcode smtp_perform_starttls(struct connectdata *conn)
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{
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CURLcode result = CURLE_OK;
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/* Send the STARTTLS command */
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result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "STARTTLS");
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if(!result)
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state(conn, SMTP_STARTTLS);
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return result;
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}
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/***********************************************************************
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*
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* smtp_perform_upgrade_tls()
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*
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* Performs the upgrade to TLS.
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*/
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static CURLcode smtp_perform_upgrade_tls(struct connectdata *conn)
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{
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CURLcode result = CURLE_OK;
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struct smtp_conn *smtpc = &conn->proto.smtpc;
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/* Start the SSL connection */
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result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &smtpc->ssldone);
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if(!result) {
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if(smtpc->state != SMTP_UPGRADETLS)
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state(conn, SMTP_UPGRADETLS);
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if(smtpc->ssldone) {
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smtp_to_smtps(conn);
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result = smtp_perform_ehlo(conn);
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}
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}
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return result;
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}
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/***********************************************************************
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*
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* smtp_perform_auth()
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*
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* Sends an AUTH command allowing the client to login with the given SASL
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* authentication mechanism.
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*/
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static CURLcode smtp_perform_auth(struct connectdata *conn,
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const char *mech,
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const char *initresp)
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{
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CURLcode result = CURLE_OK;
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struct smtp_conn *smtpc = &conn->proto.smtpc;
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if(initresp) { /* AUTH <mech> ...<crlf> */
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/* Send the AUTH command with the initial response */
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result = Curl_pp_sendf(&smtpc->pp, "AUTH %s %s", mech, initresp);
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}
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else {
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/* Send the AUTH command */
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result = Curl_pp_sendf(&smtpc->pp, "AUTH %s", mech);
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}
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return result;
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}
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|
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/***********************************************************************
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*
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* smtp_continue_auth()
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*
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* Sends SASL continuation data or cancellation.
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*/
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static CURLcode smtp_continue_auth(struct connectdata *conn, const char *resp)
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{
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struct smtp_conn *smtpc = &conn->proto.smtpc;
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return Curl_pp_sendf(&smtpc->pp, "%s", resp);
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}
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|
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/***********************************************************************
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*
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* smtp_perform_authentication()
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*
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* Initiates the authentication sequence, with the appropriate SASL
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* authentication mechanism.
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*/
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static CURLcode smtp_perform_authentication(struct connectdata *conn)
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{
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CURLcode result = CURLE_OK;
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struct smtp_conn *smtpc = &conn->proto.smtpc;
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saslprogress progress;
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/* Check we have enough data to authenticate with, and the
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server supports authentiation, and end the connect phase if not */
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if(!smtpc->auth_supported ||
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!Curl_sasl_can_authenticate(&smtpc->sasl, conn)) {
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state(conn, SMTP_STOP);
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return result;
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}
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/* Calculate the SASL login details */
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result = Curl_sasl_start(&smtpc->sasl, conn, FALSE, &progress);
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if(!result) {
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if(progress == SASL_INPROGRESS)
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state(conn, SMTP_AUTH);
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else {
|
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/* Other mechanisms not supported */
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infof(conn->data, "No known authentication mechanisms supported!\n");
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result = CURLE_LOGIN_DENIED;
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}
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}
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return result;
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}
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|
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/***********************************************************************
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*
|
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* smtp_perform_command()
|
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*
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* Sends a SMTP based command.
|
|
*/
|
|
static CURLcode smtp_perform_command(struct connectdata *conn)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
struct SMTP *smtp = data->req.protop;
|
|
|
|
/* Send the command */
|
|
if(smtp->rcpt)
|
|
result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s %s",
|
|
smtp->custom && smtp->custom[0] != '\0' ?
|
|
smtp->custom : "VRFY",
|
|
smtp->rcpt->data);
|
|
else
|
|
result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s",
|
|
smtp->custom && smtp->custom[0] != '\0' ?
|
|
smtp->custom : "HELP");
|
|
|
|
if(!result)
|
|
state(conn, SMTP_COMMAND);
|
|
|
|
return result;
|
|
}
|
|
|
|
/***********************************************************************
|
|
*
|
|
* smtp_perform_mail()
|
|
*
|
|
* Sends an MAIL command to initiate the upload of a message.
|
|
*/
|
|
static CURLcode smtp_perform_mail(struct connectdata *conn)
|
|
{
|
|
char *from = NULL;
|
|
char *auth = NULL;
|
|
char *size = NULL;
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
|
|
/* Calculate the FROM parameter */
|
|
if(!data->set.str[STRING_MAIL_FROM])
|
|
/* Null reverse-path, RFC-5321, sect. 3.6.3 */
|
|
from = strdup("<>");
|
|
else if(data->set.str[STRING_MAIL_FROM][0] == '<')
|
|
from = aprintf("%s", data->set.str[STRING_MAIL_FROM]);
|
|
else
|
|
from = aprintf("<%s>", data->set.str[STRING_MAIL_FROM]);
|
|
|
|
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')
|
|
auth = aprintf("%s", data->set.str[STRING_MAIL_AUTH]);
|
|
else
|
|
/* Empty AUTH, RFC-2554, sect. 5 */
|
|
auth = strdup("<>");
|
|
|
|
if(!auth) {
|
|
Curl_safefree(from);
|
|
|
|
return CURLE_OUT_OF_MEMORY;
|
|
}
|
|
}
|
|
|
|
/* Calculate the optional SIZE parameter */
|
|
if(conn->proto.smtpc.size_supported && conn->data->state.infilesize > 0) {
|
|
size = aprintf("%" CURL_FORMAT_CURL_OFF_T, data->state.infilesize);
|
|
|
|
if(!size) {
|
|
Curl_safefree(from);
|
|
Curl_safefree(auth);
|
|
|
|
return CURLE_OUT_OF_MEMORY;
|
|
}
|
|
}
|
|
|
|
/* Send the MAIL command */
|
|
if(!auth && !size)
|
|
result = Curl_pp_sendf(&conn->proto.smtpc.pp,
|
|
"MAIL FROM:%s", from);
|
|
else if(auth && !size)
|
|
result = Curl_pp_sendf(&conn->proto.smtpc.pp,
|
|
"MAIL FROM:%s AUTH=%s", from, auth);
|
|
else if(auth && size)
|
|
result = Curl_pp_sendf(&conn->proto.smtpc.pp,
|
|
"MAIL FROM:%s AUTH=%s SIZE=%s", from, auth, size);
|
|
else
|
|
result = Curl_pp_sendf(&conn->proto.smtpc.pp,
|
|
"MAIL FROM:%s SIZE=%s", from, size);
|
|
|
|
Curl_safefree(from);
|
|
Curl_safefree(auth);
|
|
Curl_safefree(size);
|
|
|
|
if(!result)
|
|
state(conn, 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 connectdata *conn)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
struct SMTP *smtp = data->req.protop;
|
|
|
|
/* Send the RCPT TO command */
|
|
if(smtp->rcpt->data[0] == '<')
|
|
result = Curl_pp_sendf(&conn->proto.smtpc.pp, "RCPT TO:%s",
|
|
smtp->rcpt->data);
|
|
else
|
|
result = Curl_pp_sendf(&conn->proto.smtpc.pp, "RCPT TO:<%s>",
|
|
smtp->rcpt->data);
|
|
if(!result)
|
|
state(conn, SMTP_RCPT);
|
|
|
|
return result;
|
|
}
|
|
|
|
/***********************************************************************
|
|
*
|
|
* smtp_perform_quit()
|
|
*
|
|
* Performs the quit action prior to sclose() being called.
|
|
*/
|
|
static CURLcode smtp_perform_quit(struct connectdata *conn)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
|
|
/* Send the QUIT command */
|
|
result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "QUIT");
|
|
|
|
if(!result)
|
|
state(conn, SMTP_QUIT);
|
|
|
|
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);
|
|
result = CURLE_FTP_WEIRD_SERVER_REPLY;
|
|
}
|
|
else
|
|
result = smtp_perform_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_perform_authentication(conn);
|
|
}
|
|
else
|
|
result = smtp_perform_upgrade_tls(conn);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* For EHLO responses */
|
|
static CURLcode smtp_state_ehlo_resp(struct connectdata *conn, int smtpcode,
|
|
smtpstate instate)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
struct smtp_conn *smtpc = &conn->proto.smtpc;
|
|
const char *line = data->state.buffer;
|
|
size_t len = strlen(line);
|
|
size_t wordlen;
|
|
|
|
(void)instate; /* no use for this yet */
|
|
|
|
if(smtpcode/100 != 2 && smtpcode != 1) {
|
|
if(data->set.use_ssl <= CURLUSESSL_TRY || conn->ssl[FIRSTSOCKET].use)
|
|
result = smtp_perform_helo(conn);
|
|
else {
|
|
failf(data, "Remote access denied: %d", smtpcode);
|
|
result = CURLE_REMOTE_ACCESS_DENIED;
|
|
}
|
|
}
|
|
else {
|
|
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 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;
|
|
unsigned int 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 */
|
|
if((mechbit = Curl_sasl_decode_mech(line, wordlen, &llen)) &&
|
|
llen == wordlen)
|
|
smtpc->sasl.authmechs |= mechbit;
|
|
|
|
line += wordlen;
|
|
len -= wordlen;
|
|
}
|
|
}
|
|
|
|
if(smtpcode != 1) {
|
|
if(data->set.use_ssl && !conn->ssl[FIRSTSOCKET].use) {
|
|
/* 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(conn);
|
|
else if(data->set.use_ssl == CURLUSESSL_TRY)
|
|
/* Fallback and carry on with authentication */
|
|
result = smtp_perform_authentication(conn);
|
|
else {
|
|
failf(data, "STARTTLS not supported.");
|
|
result = CURLE_USE_SSL_FAILED;
|
|
}
|
|
}
|
|
else
|
|
result = smtp_perform_authentication(conn);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* For HELO responses */
|
|
static CURLcode smtp_state_helo_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, "Remote access denied: %d", smtpcode);
|
|
result = CURLE_REMOTE_ACCESS_DENIED;
|
|
}
|
|
else
|
|
/* End of connect phase */
|
|
state(conn, SMTP_STOP);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* For SASL authentication responses */
|
|
static CURLcode smtp_state_auth_resp(struct connectdata *conn,
|
|
int smtpcode,
|
|
smtpstate instate)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
struct smtp_conn *smtpc = &conn->proto.smtpc;
|
|
saslprogress progress;
|
|
|
|
(void)instate; /* no use for this yet */
|
|
|
|
result = Curl_sasl_continue(&smtpc->sasl, conn, smtpcode, &progress);
|
|
if(!result)
|
|
switch(progress) {
|
|
case SASL_DONE:
|
|
state(conn, SMTP_STOP); /* Authenticated */
|
|
break;
|
|
case SASL_IDLE: /* No mechanism left after cancellation */
|
|
failf(data, "Authentication cancelled");
|
|
result = CURLE_LOGIN_DENIED;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* For command responses */
|
|
static CURLcode smtp_state_command_resp(struct connectdata *conn, int smtpcode,
|
|
smtpstate instate)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
struct SMTP *smtp = data->req.protop;
|
|
char *line = data->state.buffer;
|
|
size_t len = strlen(line);
|
|
|
|
(void)instate; /* no use for this yet */
|
|
|
|
if((smtp->rcpt && smtpcode/100 != 2 && smtpcode != 553 && smtpcode != 1) ||
|
|
(!smtp->rcpt && smtpcode/100 != 2 && smtpcode != 1)) {
|
|
failf(data, "Command failed: %d", smtpcode);
|
|
result = CURLE_RECV_ERROR;
|
|
}
|
|
else {
|
|
/* Temporarily add the LF character back and send as body to the client */
|
|
if(!data->set.opt_no_body) {
|
|
line[len] = '\n';
|
|
result = Curl_client_write(conn, CLIENTWRITE_BODY, line, len + 1);
|
|
line[len] = '\0';
|
|
}
|
|
|
|
if(smtpcode != 1) {
|
|
if(smtp->rcpt) {
|
|
smtp->rcpt = smtp->rcpt->next;
|
|
|
|
if(smtp->rcpt) {
|
|
/* Send the next command */
|
|
result = smtp_perform_command(conn);
|
|
}
|
|
else
|
|
/* End of DO phase */
|
|
state(conn, SMTP_STOP);
|
|
}
|
|
else
|
|
/* End of DO phase */
|
|
state(conn, SMTP_STOP);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* For MAIL responses */
|
|
static CURLcode smtp_state_mail_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, "MAIL failed: %d", smtpcode);
|
|
result = CURLE_SEND_ERROR;
|
|
}
|
|
else
|
|
/* Start the RCPT TO command */
|
|
result = smtp_perform_rcpt_to(conn);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* For RCPT responses */
|
|
static CURLcode smtp_state_rcpt_resp(struct connectdata *conn, int smtpcode,
|
|
smtpstate instate)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
struct SMTP *smtp = data->req.protop;
|
|
|
|
(void)instate; /* no use for this yet */
|
|
|
|
if(smtpcode/100 != 2) {
|
|
failf(data, "RCPT failed: %d", smtpcode);
|
|
result = CURLE_SEND_ERROR;
|
|
}
|
|
else {
|
|
smtp->rcpt = smtp->rcpt->next;
|
|
|
|
if(smtp->rcpt)
|
|
/* Send the next RCPT TO command */
|
|
result = smtp_perform_rcpt_to(conn);
|
|
else {
|
|
/* Send the DATA command */
|
|
result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "DATA");
|
|
|
|
if(!result)
|
|
state(conn, SMTP_DATA);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* For DATA response */
|
|
static CURLcode smtp_state_data_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 != 354) {
|
|
failf(data, "DATA failed: %d", smtpcode);
|
|
result = CURLE_SEND_ERROR;
|
|
}
|
|
else {
|
|
/* Set the progress upload size */
|
|
Curl_pgrsSetUploadSize(data, data->state.infilesize);
|
|
|
|
/* SMTP upload */
|
|
Curl_setup_transfer(conn, -1, -1, FALSE, NULL, FIRSTSOCKET, NULL);
|
|
|
|
/* End of DO phase */
|
|
state(conn, SMTP_STOP);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* For POSTDATA responses, which are received after the entire DATA
|
|
part has been sent to the server */
|
|
static CURLcode smtp_state_postdata_resp(struct connectdata *conn,
|
|
int smtpcode,
|
|
smtpstate instate)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
|
|
(void)instate; /* no use for this yet */
|
|
|
|
if(smtpcode != 250)
|
|
result = CURLE_RECV_ERROR;
|
|
|
|
/* End of DONE phase */
|
|
state(conn, SMTP_STOP);
|
|
|
|
return result;
|
|
}
|
|
|
|
static CURLcode smtp_statemach_act(struct connectdata *conn)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
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;
|
|
|
|
/* Busy upgrading the connection; right now all I/O is SSL/TLS, not SMTP */
|
|
if(smtpc->state == SMTP_UPGRADETLS)
|
|
return smtp_perform_upgrade_tls(conn);
|
|
|
|
/* Flush any data that needs to be sent */
|
|
if(pp->sendleft)
|
|
return Curl_pp_flushsend(pp);
|
|
|
|
do {
|
|
/* Read the response from the server */
|
|
result = Curl_pp_readresp(sock, pp, &smtpcode, &nread);
|
|
if(result)
|
|
return result;
|
|
|
|
/* Store the latest response for later retrieval if necessary */
|
|
if(smtpc->state != SMTP_QUIT && smtpcode != 1)
|
|
data->info.httpcode = smtpcode;
|
|
|
|
if(!smtpcode)
|
|
break;
|
|
|
|
/* We have now received a full SMTP server response */
|
|
switch(smtpc->state) {
|
|
case SMTP_SERVERGREET:
|
|
result = smtp_state_servergreet_resp(conn, smtpcode, smtpc->state);
|
|
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_AUTH:
|
|
result = smtp_state_auth_resp(conn, smtpcode, smtpc->state);
|
|
break;
|
|
|
|
case SMTP_COMMAND:
|
|
result = smtp_state_command_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;
|
|
}
|
|
} while(!result && smtpc->state != SMTP_STOP && Curl_pp_moredata(pp));
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Called repeatedly until done from multi.c */
|
|
static CURLcode smtp_multi_statemach(struct connectdata *conn, bool *done)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct smtp_conn *smtpc = &conn->proto.smtpc;
|
|
|
|
if((conn->handler->flags & PROTOPT_SSL) && !smtpc->ssldone) {
|
|
result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &smtpc->ssldone);
|
|
if(result || !smtpc->ssldone)
|
|
return result;
|
|
}
|
|
|
|
result = Curl_pp_statemach(&smtpc->pp, FALSE);
|
|
*done = (smtpc->state == SMTP_STOP) ? TRUE : FALSE;
|
|
|
|
return result;
|
|
}
|
|
|
|
static CURLcode smtp_block_statemach(struct connectdata *conn)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct smtp_conn *smtpc = &conn->proto.smtpc;
|
|
|
|
while(smtpc->state != SMTP_STOP && !result)
|
|
result = Curl_pp_statemach(&smtpc->pp, TRUE);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Allocate and initialize the SMTP struct for the current SessionHandle if
|
|
required */
|
|
static CURLcode smtp_init(struct connectdata *conn)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
struct SMTP *smtp;
|
|
|
|
smtp = data->req.protop = calloc(sizeof(struct SMTP), 1);
|
|
if(!smtp)
|
|
result = CURLE_OUT_OF_MEMORY;
|
|
|
|
return result;
|
|
}
|
|
|
|
/* For the SMTP "protocol connect" and "doing" phases only */
|
|
static int smtp_getsock(struct connectdata *conn, curl_socket_t *socks,
|
|
int numsocks)
|
|
{
|
|
return Curl_pp_getsock(&conn->proto.smtpc.pp, socks, numsocks);
|
|
}
|
|
|
|
/***********************************************************************
|
|
*
|
|
* smtp_connect()
|
|
*
|
|
* This function should do everything that is to be considered a part of
|
|
* the connection phase.
|
|
*
|
|
* The variable pointed to by 'done' will be TRUE if the protocol-layer
|
|
* connect phase is done when this function returns, or FALSE if not.
|
|
*/
|
|
static CURLcode smtp_connect(struct connectdata *conn, bool *done)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct smtp_conn *smtpc = &conn->proto.smtpc;
|
|
struct pingpong *pp = &smtpc->pp;
|
|
|
|
*done = FALSE; /* default to not done yet */
|
|
|
|
/* We always support persistent connections in SMTP */
|
|
connkeep(conn, "SMTP default");
|
|
|
|
/* Set the default response time-out */
|
|
pp->response_time = RESP_TIMEOUT;
|
|
pp->statemach_act = smtp_statemach_act;
|
|
pp->endofresp = smtp_endofresp;
|
|
pp->conn = conn;
|
|
|
|
/* Initialize the SASL storage */
|
|
Curl_sasl_init(&smtpc->sasl, &saslsmtp);
|
|
|
|
/* Initialise the pingpong layer */
|
|
Curl_pp_init(pp);
|
|
|
|
/* Parse the URL options */
|
|
result = smtp_parse_url_options(conn);
|
|
if(result)
|
|
return result;
|
|
|
|
/* Parse the URL path */
|
|
result = smtp_parse_url_path(conn);
|
|
if(result)
|
|
return result;
|
|
|
|
/* Start off waiting for the server greeting response */
|
|
state(conn, SMTP_SERVERGREET);
|
|
|
|
result = smtp_multi_statemach(conn, done);
|
|
|
|
return result;
|
|
}
|
|
|
|
/***********************************************************************
|
|
*
|
|
* smtp_done()
|
|
*
|
|
* The DONE function. This does what needs to be done after a single DO has
|
|
* performed.
|
|
*
|
|
* Input argument is already checked for validity.
|
|
*/
|
|
static CURLcode smtp_done(struct connectdata *conn, CURLcode status,
|
|
bool premature)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
struct SMTP *smtp = data->req.protop;
|
|
struct pingpong *pp = &conn->proto.smtpc.pp;
|
|
char *eob;
|
|
ssize_t len;
|
|
ssize_t bytes_written;
|
|
|
|
(void)premature;
|
|
|
|
if(!smtp || !pp->conn)
|
|
/* When the easy handle is removed from the multi interface while libcurl
|
|
is still trying to resolve the host name, the SMTP struct is not yet
|
|
initialized. However, the removal action calls Curl_done() which in
|
|
turn calls this function, so we simply return success. */
|
|
return CURLE_OK;
|
|
|
|
if(status) {
|
|
connclose(conn, "SMTP done with bad status"); /* marked for closure */
|
|
result = status; /* use the already set error code */
|
|
}
|
|
else if(!data->set.connect_only && data->set.upload && data->set.mail_rcpt) {
|
|
/* Calculate the EOB taking into account any terminating CRLF from the
|
|
previous line of the email or the CRLF of the DATA command when there
|
|
is "no mail data". RFC-5321, sect. 4.1.1.4.
|
|
|
|
Note: As some SSL backends, such as OpenSSL, will cause Curl_write() to
|
|
fail when using a different pointer following a previous write, that
|
|
returned CURLE_AGAIN, we duplicate the EOB now rather than when the
|
|
bytes written doesn't equal len. */
|
|
if(smtp->trailing_crlf || !conn->data->state.infilesize) {
|
|
eob = strdup(SMTP_EOB + 2);
|
|
len = SMTP_EOB_LEN - 2;
|
|
}
|
|
else {
|
|
eob = strdup(SMTP_EOB);
|
|
len = SMTP_EOB_LEN;
|
|
}
|
|
|
|
if(!eob)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
|
|
/* Send the end of block data */
|
|
result = Curl_write(conn, conn->writesockfd, eob, len, &bytes_written);
|
|
if(result) {
|
|
free(eob);
|
|
return result;
|
|
}
|
|
|
|
if(bytes_written != len) {
|
|
/* The whole chunk was not sent so keep it around and adjust the
|
|
pingpong structure accordingly */
|
|
pp->sendthis = eob;
|
|
pp->sendsize = len;
|
|
pp->sendleft = len - bytes_written;
|
|
}
|
|
else {
|
|
/* Successfully sent so adjust the response timeout relative to now */
|
|
pp->response = Curl_tvnow();
|
|
|
|
free(eob);
|
|
}
|
|
|
|
state(conn, SMTP_POSTDATA);
|
|
|
|
/* Run the state-machine
|
|
|
|
TODO: when the multi interface is used, this _really_ should be using
|
|
the smtp_multi_statemach function but we have no general support for
|
|
non-blocking DONE operations, not in the multi state machine and with
|
|
Curl_done() invokes on several places in the code!
|
|
*/
|
|
result = smtp_block_statemach(conn);
|
|
}
|
|
|
|
/* Cleanup our per-request based variables */
|
|
Curl_safefree(smtp->custom);
|
|
|
|
/* Clear the transfer mode for the next request */
|
|
smtp->transfer = FTPTRANSFER_BODY;
|
|
|
|
return result;
|
|
}
|
|
|
|
/***********************************************************************
|
|
*
|
|
* smtp_perform()
|
|
*
|
|
* This is the actual DO function for SMTP. Transfer a mail, send a command
|
|
* or get some data according to the options previously setup.
|
|
*/
|
|
static CURLcode smtp_perform(struct connectdata *conn, bool *connected,
|
|
bool *dophase_done)
|
|
{
|
|
/* This is SMTP and no proxy */
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
struct SMTP *smtp = data->req.protop;
|
|
|
|
DEBUGF(infof(conn->data, "DO phase starts\n"));
|
|
|
|
if(data->set.opt_no_body) {
|
|
/* Requested no body means no transfer */
|
|
smtp->transfer = FTPTRANSFER_INFO;
|
|
}
|
|
|
|
*dophase_done = FALSE; /* not done yet */
|
|
|
|
/* Store the first recipient (or NULL if not specified) */
|
|
smtp->rcpt = data->set.mail_rcpt;
|
|
|
|
/* Start the first command in the DO phase */
|
|
if(data->set.upload && data->set.mail_rcpt)
|
|
/* MAIL transfer */
|
|
result = smtp_perform_mail(conn);
|
|
else
|
|
/* SMTP based command (VRFY, EXPN, NOOP, RSET or HELP) */
|
|
result = smtp_perform_command(conn);
|
|
|
|
if(result)
|
|
return result;
|
|
|
|
/* Run the state-machine */
|
|
result = smtp_multi_statemach(conn, dophase_done);
|
|
|
|
*connected = conn->bits.tcpconnect[FIRSTSOCKET];
|
|
|
|
if(*dophase_done)
|
|
DEBUGF(infof(conn->data, "DO phase is complete\n"));
|
|
|
|
return result;
|
|
}
|
|
|
|
/***********************************************************************
|
|
*
|
|
* smtp_do()
|
|
*
|
|
* This function is registered as 'curl_do' function. It decodes the path
|
|
* parts etc as a wrapper to the actual DO function (smtp_perform).
|
|
*
|
|
* The input argument is already checked for validity.
|
|
*/
|
|
static CURLcode smtp_do(struct connectdata *conn, bool *done)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
|
|
*done = FALSE; /* default to false */
|
|
|
|
/* Parse the custom request */
|
|
result = smtp_parse_custom_request(conn);
|
|
if(result)
|
|
return result;
|
|
|
|
result = smtp_regular_transfer(conn, done);
|
|
|
|
return result;
|
|
}
|
|
|
|
/***********************************************************************
|
|
*
|
|
* smtp_disconnect()
|
|
*
|
|
* Disconnect from an SMTP server. Cleanup protocol-specific per-connection
|
|
* resources. BLOCKING.
|
|
*/
|
|
static CURLcode smtp_disconnect(struct connectdata *conn, bool dead_connection)
|
|
{
|
|
struct smtp_conn *smtpc = &conn->proto.smtpc;
|
|
|
|
/* We cannot send quit unconditionally. If this connection is stale or
|
|
bad in any way, sending quit and waiting around here will make the
|
|
disconnect wait in vain and cause more problems than we need to. */
|
|
|
|
/* The SMTP session may or may not have been allocated/setup at this
|
|
point! */
|
|
if(!dead_connection && smtpc->pp.conn && smtpc->pp.conn->bits.protoconnstart)
|
|
if(!smtp_perform_quit(conn))
|
|
(void)smtp_block_statemach(conn); /* ignore errors on QUIT */
|
|
|
|
/* Disconnect from the server */
|
|
Curl_pp_disconnect(&smtpc->pp);
|
|
|
|
/* Cleanup the SASL module */
|
|
Curl_sasl_cleanup(conn, smtpc->sasl.authused);
|
|
|
|
/* Cleanup our connection based variables */
|
|
Curl_safefree(smtpc->domain);
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/* Call this when the DO phase has completed */
|
|
static CURLcode smtp_dophase_done(struct connectdata *conn, bool connected)
|
|
{
|
|
struct SMTP *smtp = conn->data->req.protop;
|
|
|
|
(void)connected;
|
|
|
|
if(smtp->transfer != FTPTRANSFER_BODY)
|
|
/* no data to transfer */
|
|
Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/* Called from multi.c while DOing */
|
|
static CURLcode smtp_doing(struct connectdata *conn, bool *dophase_done)
|
|
{
|
|
CURLcode result = smtp_multi_statemach(conn, dophase_done);
|
|
|
|
if(result)
|
|
DEBUGF(infof(conn->data, "DO phase failed\n"));
|
|
else if(*dophase_done) {
|
|
result = smtp_dophase_done(conn, FALSE /* not connected */);
|
|
|
|
DEBUGF(infof(conn->data, "DO phase is complete\n"));
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/***********************************************************************
|
|
*
|
|
* smtp_regular_transfer()
|
|
*
|
|
* The input argument is already checked for validity.
|
|
*
|
|
* Performs all commands done before a regular transfer between a local and a
|
|
* remote host.
|
|
*/
|
|
static CURLcode smtp_regular_transfer(struct connectdata *conn,
|
|
bool *dophase_done)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
bool connected = FALSE;
|
|
struct SessionHandle *data = conn->data;
|
|
|
|
/* Make sure size is unknown at this point */
|
|
data->req.size = -1;
|
|
|
|
/* Set the progress data */
|
|
Curl_pgrsSetUploadCounter(data, 0);
|
|
Curl_pgrsSetDownloadCounter(data, 0);
|
|
Curl_pgrsSetUploadSize(data, -1);
|
|
Curl_pgrsSetDownloadSize(data, -1);
|
|
|
|
/* Carry out the perform */
|
|
result = smtp_perform(conn, &connected, dophase_done);
|
|
|
|
/* Perform post DO phase operations if necessary */
|
|
if(!result && *dophase_done)
|
|
result = smtp_dophase_done(conn, connected);
|
|
|
|
return result;
|
|
}
|
|
|
|
static CURLcode smtp_setup_connection(struct connectdata *conn)
|
|
{
|
|
struct SessionHandle *data = conn->data;
|
|
CURLcode result;
|
|
|
|
if(conn->bits.httpproxy && !data->set.tunnel_thru_httpproxy) {
|
|
/* Unless we have asked to tunnel SMTP operations through the proxy, we
|
|
switch and use HTTP operations only */
|
|
#ifndef CURL_DISABLE_HTTP
|
|
if(conn->handler == &Curl_handler_smtp)
|
|
conn->handler = &Curl_handler_smtp_proxy;
|
|
else {
|
|
#ifdef USE_SSL
|
|
conn->handler = &Curl_handler_smtps_proxy;
|
|
#else
|
|
failf(data, "SMTPS not supported!");
|
|
return CURLE_UNSUPPORTED_PROTOCOL;
|
|
#endif
|
|
}
|
|
/* set it up as a HTTP connection instead */
|
|
return conn->handler->setup_connection(conn);
|
|
|
|
#else
|
|
failf(data, "SMTP over http proxy requires HTTP support built-in!");
|
|
return CURLE_UNSUPPORTED_PROTOCOL;
|
|
#endif
|
|
}
|
|
|
|
/* Initialise the SMTP layer */
|
|
result = smtp_init(conn);
|
|
if(result)
|
|
return result;
|
|
|
|
data->state.path++; /* don't include the initial slash */
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/***********************************************************************
|
|
*
|
|
* smtp_parse_url_options()
|
|
*
|
|
* Parse the URL login options.
|
|
*/
|
|
static CURLcode smtp_parse_url_options(struct connectdata *conn)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct smtp_conn *smtpc = &conn->proto.smtpc;
|
|
const char *ptr = conn->options;
|
|
|
|
smtpc->sasl.resetprefs = TRUE;
|
|
|
|
while(!result && ptr && *ptr) {
|
|
const char *key = ptr;
|
|
const char *value;
|
|
|
|
while(*ptr && *ptr != '=')
|
|
ptr++;
|
|
|
|
value = ptr + 1;
|
|
|
|
while(*ptr && *ptr != ';')
|
|
ptr++;
|
|
|
|
if(strnequal(key, "AUTH=", 5))
|
|
result = Curl_sasl_parse_url_auth_option(&smtpc->sasl,
|
|
value, ptr - value);
|
|
else
|
|
result = CURLE_URL_MALFORMAT;
|
|
|
|
if(*ptr == ';')
|
|
ptr++;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/***********************************************************************
|
|
*
|
|
* smtp_parse_url_path()
|
|
*
|
|
* Parse the URL path into separate path components.
|
|
*/
|
|
static CURLcode smtp_parse_url_path(struct connectdata *conn)
|
|
{
|
|
/* The SMTP struct is already initialised in smtp_connect() */
|
|
struct SessionHandle *data = conn->data;
|
|
struct smtp_conn *smtpc = &conn->proto.smtpc;
|
|
const char *path = data->state.path;
|
|
char localhost[HOSTNAME_MAX + 1];
|
|
|
|
/* Calculate the path if necessary */
|
|
if(!*path) {
|
|
if(!Curl_gethostname(localhost, sizeof(localhost)))
|
|
path = localhost;
|
|
else
|
|
path = "localhost";
|
|
}
|
|
|
|
/* URL decode the path and use it as the domain in our EHLO */
|
|
return Curl_urldecode(conn->data, path, 0, &smtpc->domain, NULL, TRUE);
|
|
}
|
|
|
|
/***********************************************************************
|
|
*
|
|
* smtp_parse_custom_request()
|
|
*
|
|
* Parse the custom request.
|
|
*/
|
|
static CURLcode smtp_parse_custom_request(struct connectdata *conn)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct SessionHandle *data = conn->data;
|
|
struct SMTP *smtp = data->req.protop;
|
|
const char *custom = data->set.str[STRING_CUSTOMREQUEST];
|
|
|
|
/* URL decode the custom request */
|
|
if(custom)
|
|
result = Curl_urldecode(data, custom, 0, &smtp->custom, NULL, TRUE);
|
|
|
|
return result;
|
|
}
|
|
|
|
CURLcode Curl_smtp_escape_eob(struct connectdata *conn, const ssize_t nread)
|
|
{
|
|
/* When sending a SMTP payload we must detect CRLF. sequences making sure
|
|
they are sent as CRLF.. instead, as a . on the beginning of a line will
|
|
be deleted by the server when not part of an EOB terminator and a
|
|
genuine CRLF.CRLF which isn't escaped will wrongly be detected as end of
|
|
data by the server
|
|
*/
|
|
ssize_t i;
|
|
ssize_t si;
|
|
struct SessionHandle *data = conn->data;
|
|
struct SMTP *smtp = data->req.protop;
|
|
char *scratch = data->state.scratch;
|
|
char *newscratch = NULL;
|
|
char *oldscratch = NULL;
|
|
size_t eob_sent;
|
|
|
|
/* Do we need to allocate a scratch buffer? */
|
|
if(!scratch || data->set.crlf) {
|
|
oldscratch = scratch;
|
|
|
|
scratch = newscratch = malloc(2 * BUFSIZE);
|
|
if(!newscratch) {
|
|
failf(data, "Failed to alloc scratch buffer!");
|
|
|
|
return CURLE_OUT_OF_MEMORY;
|
|
}
|
|
}
|
|
|
|
/* Have we already sent part of the EOB? */
|
|
eob_sent = smtp->eob;
|
|
|
|
/* This loop can be improved by some kind of Boyer-Moore style of
|
|
approach but that is saved for later... */
|
|
for(i = 0, si = 0; i < nread; i++) {
|
|
if(SMTP_EOB[smtp->eob] == data->req.upload_fromhere[i]) {
|
|
smtp->eob++;
|
|
|
|
/* Is the EOB potentially the terminating CRLF? */
|
|
if(2 == smtp->eob || SMTP_EOB_LEN == smtp->eob)
|
|
smtp->trailing_crlf = TRUE;
|
|
else
|
|
smtp->trailing_crlf = FALSE;
|
|
}
|
|
else if(smtp->eob) {
|
|
/* A previous substring matched so output that first */
|
|
memcpy(&scratch[si], &SMTP_EOB[eob_sent], smtp->eob - eob_sent);
|
|
si += smtp->eob - eob_sent;
|
|
|
|
/* Then compare the first byte */
|
|
if(SMTP_EOB[0] == data->req.upload_fromhere[i])
|
|
smtp->eob = 1;
|
|
else
|
|
smtp->eob = 0;
|
|
|
|
eob_sent = 0;
|
|
|
|
/* Reset the trailing CRLF flag as there was more data */
|
|
smtp->trailing_crlf = FALSE;
|
|
}
|
|
|
|
/* Do we have a match for CRLF. as per RFC-5321, sect. 4.5.2 */
|
|
if(SMTP_EOB_FIND_LEN == smtp->eob) {
|
|
/* Copy the replacement data to the target buffer */
|
|
memcpy(&scratch[si], &SMTP_EOB_REPL[eob_sent],
|
|
SMTP_EOB_REPL_LEN - eob_sent);
|
|
si += SMTP_EOB_REPL_LEN - eob_sent;
|
|
smtp->eob = 0;
|
|
eob_sent = 0;
|
|
}
|
|
else if(!smtp->eob)
|
|
scratch[si++] = data->req.upload_fromhere[i];
|
|
}
|
|
|
|
if(smtp->eob - eob_sent) {
|
|
/* A substring matched before processing ended so output that now */
|
|
memcpy(&scratch[si], &SMTP_EOB[eob_sent], smtp->eob - eob_sent);
|
|
si += smtp->eob - eob_sent;
|
|
}
|
|
|
|
/* Only use the new buffer if we replaced something */
|
|
if(si != nread) {
|
|
/* Upload from the new (replaced) buffer instead */
|
|
data->req.upload_fromhere = scratch;
|
|
|
|
/* Save the buffer so it can be freed later */
|
|
data->state.scratch = scratch;
|
|
|
|
/* Free the old scratch buffer */
|
|
Curl_safefree(oldscratch);
|
|
|
|
/* Set the new amount too */
|
|
data->req.upload_present = si;
|
|
}
|
|
else
|
|
Curl_safefree(newscratch);
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
#endif /* CURL_DISABLE_SMTP */
|