src/common/smtp.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2012 Hiroyuki Yamamoto and the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  *
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #include "claws-features.h"
  23 #endif
  24
  25 #include <glib.h>
  26 #ifdef ENABLE_NLS
  27 #include <glib/gi18n.h>
  28 #else
  29 #define _(a) (a)
  30 #define N_(a) (a)
  31 #endif
  32 #include <stdio.h>
  33 #include <string.h>
  34
  35 #include "smtp.h"
  36 #include "md5.h"
  37 #include "utils.h"
  38 #include "log.h"
  39
  40 static void smtp_session_destroy(Session *session);
  41
  42 static gint smtp_auth(SMTPSession *session);
  43 #ifdef USE_GNUTLS
  44 static gint smtp_starttls(SMTPSession *session);
  45 #endif
  46 static gint smtp_auth_cram_md5(SMTPSession *session);
  47 static gint smtp_auth_login(SMTPSession *session);
  48 static gint smtp_auth_plain(SMTPSession *session);
  49
  50 static gint smtp_ehlo(SMTPSession *session);
  51 static gint smtp_ehlo_recv(SMTPSession *session, const gchar *msg);
  52
  53 static gint smtp_helo(SMTPSession *session);
  54 static gint smtp_rcpt(SMTPSession *session);
  55 static gint smtp_data(SMTPSession *session);
  56 static gint smtp_send_data(SMTPSession *session);
  57 static gint smtp_make_ready(SMTPSession *session);
  58 static gint smtp_eom(SMTPSession *session);
  59
  60 static gint smtp_session_recv_msg(Session *session, const gchar *msg);
  61 static gint smtp_session_send_data_finished(Session *session, guint len);
  62
  63
  64 Session *smtp_session_new(void *prefs_account)
  65 {
  66         SMTPSession *session;
  67
  68         session = g_new0(SMTPSession, 1);
  69
  70         session_init(SESSION(session), prefs_account, TRUE);
  71
  72         SESSION(session)->type             = SESSION_SMTP;
  73
  74         SESSION(session)->recv_msg         = smtp_session_recv_msg;
  75
  76         SESSION(session)->recv_data_finished = NULL;
  77         SESSION(session)->send_data_finished = smtp_session_send_data_finished;
  78
  79         SESSION(session)->destroy          = smtp_session_destroy;
  80
  81         session->state                     = SMTP_READY;
  82
  83 #ifdef USE_GNUTLS
  84         session->tls_init_done             = FALSE;
  85 #endif
  86
  87         session->hostname                  = NULL;
  88         session->user                      = NULL;
  89         session->pass                      = NULL;
  90
  91         session->from                      = NULL;
  92         session->to_list                   = NULL;
  93         session->cur_to                    = NULL;
  94
  95         session->send_data                 = NULL;
  96         session->send_data_len             = 0;
  97
  98         session->max_message_size          = -1;
  99
 100         session->avail_auth_type           = 0;
 101         session->forced_auth_type          = 0;
 102         session->auth_type                 = 0;
 103         session->esmtp_flags               = 0;
 104
 105         session->error_val                 = SM_OK;
 106         session->error_msg                 = NULL;
 107
 108         return SESSION(session);
 109 }
 110
 111 static void smtp_session_destroy(Session *session)
 112 {
 113         SMTPSession *smtp_session = SMTP_SESSION(session);
 114
 115         g_free(smtp_session->hostname);
 116         g_free(smtp_session->user);
 117         g_free(smtp_session->pass);
 118         g_free(smtp_session->from);
 119
 120         g_free(smtp_session->send_data);
 121
 122         g_free(smtp_session->error_msg);
 123 }
 124
 125 gint smtp_from(SMTPSession *session)
 126 {
 127         gchar buf[MESSAGEBUFSIZE];
 128         gchar *mail_size = NULL;
 129
 130         cm_return_val_if_fail(session->from != NULL, SM_ERROR);
 131
 132         session->state = SMTP_FROM;
 133
 134         if (session->is_esmtp && (session->esmtp_flags & ESMTP_SIZE)!=0)
 135                 mail_size = g_strdup_printf(" SIZE=%d", session->send_data_len);
 136         else
 137                 mail_size = g_strdup("");
 138
 139
 140         if (strchr(session->from, '<'))
 141                 g_snprintf(buf, sizeof(buf), "MAIL FROM:%s%s", session->from,
 142                            mail_size);
 143         else
 144                 g_snprintf(buf, sizeof(buf), "MAIL FROM:<%s>%s", session->from,
 145                            mail_size);
 146
 147         g_free(mail_size);
 148
 149         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
 150                 return SM_ERROR;
 151         log_print(LOG_PROTOCOL, "%sSMTP> %s\n", (session->is_esmtp?"E":""), buf);
 152
 153         return SM_OK;
 154 }
 155
 156 static gint smtp_auth(SMTPSession *session)
 157 {
 158
 159         cm_return_val_if_fail(session->user != NULL, SM_ERROR);
 160
 161         session->state = SMTP_AUTH;
 162
 163         if ((session->forced_auth_type == SMTPAUTH_CRAM_MD5
 164              || session->forced_auth_type == 0)
 165             &&
 166              (session->avail_auth_type & SMTPAUTH_CRAM_MD5) != 0)
 167                 smtp_auth_cram_md5(session);
 168         else if ((session->forced_auth_type == SMTPAUTH_LOGIN
 169                   || session->forced_auth_type == 0)
 170                  &&
 171                   (session->avail_auth_type & SMTPAUTH_LOGIN) != 0)
 172                 smtp_auth_login(session);
 173         else if ((session->forced_auth_type == SMTPAUTH_PLAIN
 174                   || session->forced_auth_type == 0)
 175                  &&
 176                   (session->avail_auth_type & SMTPAUTH_PLAIN) != 0)
 177                 smtp_auth_plain(session);
 178         else if (session->forced_auth_type == 0) {
 179                 log_warning(LOG_PROTOCOL, _("No SMTP AUTH method available\n"));
 180                 return SM_AUTHFAIL;
 181         } else {
 182                 log_warning(LOG_PROTOCOL, _("Selected SMTP AUTH method not available\n"));
 183                 return SM_AUTHFAIL;
 184         }
 185
 186         return SM_OK;
 187 }
 188
 189 static gint smtp_auth_recv(SMTPSession *session, const gchar *msg)
 190 {
 191         gchar buf[MESSAGEBUFSIZE], *tmp;
 192
 193         switch (session->auth_type) {
 194         case SMTPAUTH_LOGIN:
 195                 session->state = SMTP_AUTH_LOGIN_USER;
 196
 197                 if (!strncmp(msg, "334 ", 4)) {
 198                         tmp = g_base64_encode(session->user, strlen(session->user));
 199                         debug_print("|%s|\n", tmp);
 200
 201                         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
 202                                          tmp) < 0) {
 203                                 g_free(tmp);
 204                                 return SM_ERROR;
 205                         }
 206                         g_free(tmp);
 207                         log_print(LOG_PROTOCOL, "ESMTP> [USERID]\n");
 208                 } else {
 209                         /* Server rejects AUTH */
 210                         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
 211                                          "*") < 0)
 212                                 return SM_ERROR;
 213                         log_print(LOG_PROTOCOL, "ESMTP> *\n");
 214                 }
 215                 break;
 216         case SMTPAUTH_CRAM_MD5:
 217                 session->state = SMTP_AUTH_CRAM_MD5;
 218
 219                 if (!strncmp(msg, "334 ", 4)) {
 220                         gchar *response;
 221                         gchar *response64;
 222                         gchar *challenge, *tmp;
 223                         gsize challengelen;
 224                         guchar hexdigest[33];
 225
 226                         tmp = g_base64_decode(msg + 4, &challengelen);
 227                         challenge = g_strndup(tmp, challengelen);
 228                         g_free(tmp);
 229                         log_print(LOG_PROTOCOL, "ESMTP< [Decoded: %s]\n", challenge);
 230
 231                         g_snprintf(buf, sizeof(buf), "%s", session->pass);
 232                         md5_hex_hmac(hexdigest, challenge, challengelen,
 233                                      buf, strlen(session->pass));
 234                         g_free(challenge);
 235
 236                         response = g_strdup_printf
 237                                 ("%s %s", session->user, hexdigest);
 238                         log_print(LOG_PROTOCOL, "ESMTP> [Encoded: %s]\n", response);
 239
 240                         response64 = g_base64_encode(response, strlen(response));
 241                         g_free(response);
 242
 243                         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
 244                                          response64) < 0) {
 245                                 g_free(response64);
 246                                 return SM_ERROR;
 247                         }
 248                         log_print(LOG_PROTOCOL, "ESMTP> %s\n", response64);
 249                         g_free(response64);
 250                 } else {
 251                         /* Server rejects AUTH */
 252                         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
 253                                          "*") < 0)
 254                                 return SM_ERROR;
 255                         log_print(LOG_PROTOCOL, "ESMTP> *\n");
 256                 }
 257                 break;
 258         case SMTPAUTH_DIGEST_MD5:
 259         default:
 260                 /* stop smtp_auth when no correct authtype */
 261                 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "*") < 0)
 262                         return SM_ERROR;
 263                 log_print(LOG_PROTOCOL, "ESMTP> *\n");
 264                 break;
 265         }
 266
 267         return SM_OK;
 268 }
 269
 270 static gint smtp_auth_login_user_recv(SMTPSession *session, const gchar *msg)
 271 {
 272         gchar *tmp;
 273
 274         session->state = SMTP_AUTH_LOGIN_PASS;
 275
 276         if (!strncmp(msg, "334 ", 4)) {
 277                 tmp = g_base64_encode(session->pass, strlen(session->pass));
 278         } else {
 279                 /* Server rejects AUTH */
 280                 tmp = g_strdup("*");
 281         }
 282
 283         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, tmp) < 0) {
 284                 g_free(tmp);
 285                 return SM_ERROR;
 286         }
 287         g_free(tmp);
 288
 289         log_print(LOG_PROTOCOL, "ESMTP> [PASSWORD]\n");
 290
 291         return SM_OK;
 292 }
 293
 294 static gint smtp_ehlo(SMTPSession *session)
 295 {
 296         gchar buf[MESSAGEBUFSIZE];
 297
 298         session->state = SMTP_EHLO;
 299
 300         session->avail_auth_type = 0;
 301
 302         g_snprintf(buf, sizeof(buf), "EHLO %s",
 303                    session->hostname ? session->hostname : get_domain_name());
 304         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
 305                 return SM_ERROR;
 306         log_print(LOG_PROTOCOL, "ESMTP> %s\n", buf);
 307
 308         return SM_OK;
 309 }
 310
 311 static gint smtp_ehlo_recv(SMTPSession *session, const gchar *msg)
 312 {
 313         if (strncmp(msg, "250", 3) == 0) {
 314                 const gchar *p = msg;
 315                 p += 3;
 316                 if (*p == '-' || *p == ' ') p++;
 317                 if (g_ascii_strncasecmp(p, "AUTH", 4) == 0) {
 318                         p += 5;
 319                         if (strcasestr(p, "PLAIN"))
 320                                 session->avail_auth_type |= SMTPAUTH_PLAIN;
 321                         if (strcasestr(p, "LOGIN"))
 322                                 session->avail_auth_type |= SMTPAUTH_LOGIN;
 323                         if (strcasestr(p, "CRAM-MD5"))
 324                                 session->avail_auth_type |= SMTPAUTH_CRAM_MD5;
 325                         if (strcasestr(p, "DIGEST-MD5"))
 326                                 session->avail_auth_type |= SMTPAUTH_DIGEST_MD5;
 327                 }
 328                 if (g_ascii_strncasecmp(p, "SIZE", 4) == 0) {
 329                         p += 5;
 330                         session->max_message_size = atoi(p);
 331                         session->esmtp_flags |= ESMTP_SIZE;
 332                 }
 333                 if (g_ascii_strncasecmp(p, "STARTTLS", 8) == 0) {
 334                         p += 9;
 335                         session->avail_auth_type |= SMTPAUTH_TLS_AVAILABLE;
 336                 }
 337                 return SM_OK;
 338         } else if ((msg[0] == '1' || msg[0] == '2' || msg[0] == '3') &&
 339             (msg[3] == ' ' || msg[3] == '\0'))
 340                 return SM_OK;
 341         else if (msg[0] == '5' && msg[1] == '0' &&
 342                  (msg[2] == '4' || msg[2] == '3' || msg[2] == '1'))
 343                 return SM_ERROR;
 344
 345         return SM_ERROR;
 346 }
 347
 348 #ifdef USE_GNUTLS
 349 static gint smtp_starttls(SMTPSession *session)
 350 {
 351         session->state = SMTP_STARTTLS;
 352
 353         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "STARTTLS") < 0)
 354                 return SM_ERROR;
 355         log_print(LOG_PROTOCOL, "ESMTP> STARTTLS\n");
 356
 357         return SM_OK;
 358 }
 359 #endif
 360
 361 static gint smtp_auth_cram_md5(SMTPSession *session)
 362 {
 363         session->state = SMTP_AUTH;
 364         session->auth_type = SMTPAUTH_CRAM_MD5;
 365
 366         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH CRAM-MD5") < 0)
 367                 return SM_ERROR;
 368         log_print(LOG_PROTOCOL, "ESMTP> AUTH CRAM-MD5\n");
 369
 370         return SM_OK;
 371 }
 372
 373 static gint smtp_auth_plain(SMTPSession *session)
 374 {
 375         gchar buf[MESSAGEBUFSIZE], *b64buf, *out;
 376         gint len;
 377
 378         session->state = SMTP_AUTH_PLAIN;
 379         session->auth_type = SMTPAUTH_PLAIN;
 380
 381         memset(buf, 0, sizeof buf);
 382
 383         /* "\0user\0password" */
 384         len = sprintf(buf, "%c%s%c%s", '\0', session->user, '\0', session->pass);
 385         b64buf = g_base64_encode(buf, len);
 386         out = g_strconcat("AUTH PLAIN ", b64buf, NULL);
 387         g_free(b64buf);
 388
 389         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, out) < 0) {
 390                 g_free(out);
 391                 return SM_ERROR;
 392         }
 393
 394         g_free(out);
 395
 396         log_print(LOG_PROTOCOL, "ESMTP> [AUTH PLAIN]\n");
 397
 398         g_free(b64buf);
 399
 400         return SM_OK;
 401 }
 402
 403 static gint smtp_auth_login(SMTPSession *session)
 404 {
 405         session->state = SMTP_AUTH;
 406         session->auth_type = SMTPAUTH_LOGIN;
 407
 408         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH LOGIN") < 0)
 409                 return SM_ERROR;
 410         log_print(LOG_PROTOCOL, "ESMTP> AUTH LOGIN\n");
 411
 412         return SM_OK;
 413 }
 414
 415 static gint smtp_helo(SMTPSession *session)
 416 {
 417         gchar buf[MESSAGEBUFSIZE];
 418
 419         session->state = SMTP_HELO;
 420
 421         g_snprintf(buf, sizeof(buf), "HELO %s",
 422                    session->hostname ? session->hostname : get_domain_name());
 423         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
 424                 return SM_ERROR;
 425         log_print(LOG_PROTOCOL, "SMTP> %s\n", buf);
 426
 427         return SM_OK;
 428 }
 429
 430 static gint smtp_rcpt(SMTPSession *session)
 431 {
 432         gchar buf[MESSAGEBUFSIZE];
 433         gchar *to;
 434
 435         cm_return_val_if_fail(session->cur_to != NULL, SM_ERROR);
 436
 437         session->state = SMTP_RCPT;
 438
 439         to = (gchar *)session->cur_to->data;
 440
 441         if (strchr(to, '<'))
 442                 g_snprintf(buf, sizeof(buf), "RCPT TO:%s", to);
 443         else
 444                 g_snprintf(buf, sizeof(buf), "RCPT TO:<%s>", to);
 445         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
 446                 return SM_ERROR;
 447         log_print(LOG_PROTOCOL, "SMTP> %s\n", buf);
 448
 449         session->cur_to = session->cur_to->next;
 450
 451         return SM_OK;
 452 }
 453
 454 static gint smtp_data(SMTPSession *session)
 455 {
 456         session->state = SMTP_DATA;
 457
 458         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "DATA") < 0)
 459                 return SM_ERROR;
 460         log_print(LOG_PROTOCOL, "SMTP> DATA\n");
 461
 462         return SM_OK;
 463 }
 464
 465 static gint smtp_send_data(SMTPSession *session)
 466 {
 467         session->state = SMTP_SEND_DATA;
 468
 469         session_send_data(SESSION(session), session->send_data,
 470                           session->send_data_len);
 471
 472         return SM_OK;
 473 }
 474
 475 static gint smtp_make_ready(SMTPSession *session)
 476 {
 477         session->state = SMTP_MAIL_SENT_OK;
 478
 479         return SM_OK;
 480 }
 481
 482 gint smtp_quit(SMTPSession *session)
 483 {
 484         session->state = SMTP_QUIT;
 485
 486         session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "QUIT");
 487         log_print(LOG_PROTOCOL, "SMTP> QUIT\n");
 488
 489         return SM_OK;
 490 }
 491
 492 static gint smtp_eom(SMTPSession *session)
 493 {
 494         session->state = SMTP_EOM;
 495
 496         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, ".") < 0)
 497                 return SM_ERROR;
 498         log_print(LOG_PROTOCOL, "SMTP> . (EOM)\n");
 499
 500         return SM_OK;
 501 }
 502
 503 static gint smtp_session_recv_msg(Session *session, const gchar *msg)
 504 {
 505         SMTPSession *smtp_session = SMTP_SESSION(session);
 506         gboolean cont = FALSE;
 507         gint ret = 0;
 508
 509         if (strlen(msg) < 4) {
 510                 log_warning(LOG_PROTOCOL, _("bad SMTP response\n"));
 511                 return -1;
 512         }
 513
 514         switch (smtp_session->state) {
 515         case SMTP_EHLO:
 516         case SMTP_STARTTLS:
 517         case SMTP_AUTH:
 518         case SMTP_AUTH_PLAIN:
 519         case SMTP_AUTH_LOGIN_USER:
 520         case SMTP_AUTH_LOGIN_PASS:
 521         case SMTP_AUTH_CRAM_MD5:
 522                 log_print(LOG_PROTOCOL, "ESMTP< %s\n", msg);
 523                 break;
 524         default:
 525                 log_print(LOG_PROTOCOL, "SMTP< %s\n", msg);
 526                 break;
 527         }
 528
 529         /* ignore all multiline responses except for EHLO */
 530         if (msg[3] == '-' && smtp_session->state != SMTP_EHLO)
 531                 return session_recv_msg(session);
 532
 533         if (msg[0] == '5' && msg[1] == '0' &&
 534             (msg[2] == '4' || msg[2] == '3' || msg[2] == '1')) {
 535                 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
 536                 smtp_session->state = SMTP_ERROR;
 537                 smtp_session->error_val = SM_ERROR;
 538                 g_free(smtp_session->error_msg);
 539                 smtp_session->error_msg = g_strdup(msg);
 540                 return -1;
 541         }
 542
 543         if (!strncmp(msg, "535", 3)) {
 544                 log_warning(LOG_PROTOCOL, _("error occurred on authentication\n"));
 545                 smtp_session->state = SMTP_ERROR;
 546                 smtp_session->error_val = SM_AUTHFAIL;
 547                 g_free(smtp_session->error_msg);
 548                 smtp_session->error_msg = g_strdup(msg);
 549                 return -1;
 550         }
 551
 552         if (msg[0] != '1' && msg[0] != '2' && msg[0] != '3') {
 553                 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
 554                 smtp_session->state = SMTP_ERROR;
 555                 smtp_session->error_val = SM_ERROR;
 556                 g_free(smtp_session->error_msg);
 557                 smtp_session->error_msg = g_strdup(msg);
 558                 return -1;
 559         }
 560
 561         if (msg[3] == '-')
 562                 cont = TRUE;
 563         else if (msg[3] != ' ' && msg[3] != '\0') {
 564                 log_warning(LOG_PROTOCOL, _("bad SMTP response\n"));
 565                 smtp_session->state = SMTP_ERROR;
 566                 smtp_session->error_val = SM_UNRECOVERABLE;
 567                 return -1;
 568         }
 569
 570         switch (smtp_session->state) {
 571         case SMTP_READY:
 572                 if (strstr(msg, "ESMTP"))
 573                         smtp_session->is_esmtp = TRUE;
 574 #ifdef USE_GNUTLS
 575                 if (smtp_session->user || session->ssl_type != SSL_NONE ||
 576                     smtp_session->is_esmtp)
 577 #else
 578                 if (smtp_session->user || smtp_session->is_esmtp)
 579 #endif
 580                         ret = smtp_ehlo(smtp_session);
 581                 else
 582                         ret = smtp_helo(smtp_session);
 583                 break;
 584         case SMTP_HELO:
 585                 ret = smtp_from(smtp_session);
 586                 break;
 587         case SMTP_EHLO:
 588                 ret = smtp_ehlo_recv(smtp_session, msg);
 589                 if (cont == TRUE)
 590                         break;
 591                 if (smtp_session->max_message_size > 0
 592                 && smtp_session->max_message_size <
 593                    smtp_session->send_data_len) {
 594                         log_warning(LOG_PROTOCOL, _("Message is too big "
 595                               "(Maximum size is %s)\n"),
 596                               to_human_readable(
 597                                (goffset)(smtp_session->max_message_size)));
 598                         smtp_session->state = SMTP_ERROR;
 599                         smtp_session->error_val = SM_ERROR;
 600                         return -1;
 601                 }
 602 #ifdef USE_GNUTLS
 603                 if (session->ssl_type == SSL_STARTTLS &&
 604                     smtp_session->tls_init_done == FALSE) {
 605                         ret = smtp_starttls(smtp_session);
 606                         break;
 607                 }
 608 #endif
 609                 if (smtp_session->user) {
 610                         if (smtp_auth(smtp_session) != SM_OK) {
 611 #ifdef USE_GNUTLS
 612                                 if (session->ssl_type == SSL_NONE
 613                                 &&  smtp_session->tls_init_done == FALSE
 614                                 &&  (smtp_session->avail_auth_type & SMTPAUTH_TLS_AVAILABLE))
 615                                         ret = smtp_starttls(smtp_session);
 616                                 else
 617 #endif
 618                                         ret = smtp_from(smtp_session);
 619                         }
 620                 } else
 621                         ret = smtp_from(smtp_session);
 622                 break;
 623         case SMTP_STARTTLS:
 624 #ifdef USE_GNUTLS
 625                 if (session_start_tls(session) < 0) {
 626                         log_warning(LOG_PROTOCOL, _("couldn't start TLS session\n"));
 627                         smtp_session->state = SMTP_ERROR;
 628                         smtp_session->error_val = SM_ERROR;
 629                         return -1;
 630                 }
 631                 smtp_session->tls_init_done = TRUE;
 632                 ret = smtp_ehlo(smtp_session);
 633 #endif
 634                 break;
 635         case SMTP_AUTH:
 636                 ret = smtp_auth_recv(smtp_session, msg);
 637                 break;
 638         case SMTP_AUTH_LOGIN_USER:
 639                 ret = smtp_auth_login_user_recv(smtp_session, msg);
 640                 break;
 641         case SMTP_AUTH_PLAIN:
 642         case SMTP_AUTH_LOGIN_PASS:
 643         case SMTP_AUTH_CRAM_MD5:
 644                 ret = smtp_from(smtp_session);
 645                 break;
 646         case SMTP_FROM:
 647                 if (smtp_session->cur_to)
 648                         ret = smtp_rcpt(smtp_session);
 649                 break;
 650         case SMTP_RCPT:
 651                 if (smtp_session->cur_to)
 652                         ret = smtp_rcpt(smtp_session);
 653                 else
 654                         ret = smtp_data(smtp_session);
 655                 break;
 656         case SMTP_DATA:
 657                 ret = smtp_send_data(smtp_session);
 658                 break;
 659         case SMTP_EOM:
 660                 smtp_make_ready(smtp_session);
 661                 break;
 662         case SMTP_QUIT:
 663                 session_disconnect(session);
 664                 break;
 665         case SMTP_ERROR:
 666         default:
 667                 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
 668                 smtp_session->error_val = SM_ERROR;
 669                 return -1;
 670         }
 671
 672         if (cont && ret == SM_OK)
 673                 return session_recv_msg(session);
 674
 675         if (ret != SM_OK)
 676                 smtp_session->error_val = SM_ERROR;
 677
 678         return ret == SM_OK ? 0 : -1;
 679 }
 680
 681 static gint smtp_session_send_data_finished(Session *session, guint len)
 682 {
 683         return smtp_eom(SMTP_SESSION(session));
 684 }