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
 200                         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
 201                                          tmp) < 0) {
 202                                 g_free(tmp);
 203                                 return SM_ERROR;
 204                         }
 205                         g_free(tmp);
 206                         log_print(LOG_PROTOCOL, "ESMTP> [USERID]\n");
 207                 } else {
 208                         /* Server rejects AUTH */
 209                         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
 210                                          "*") < 0)
 211                                 return SM_ERROR;
 212                         log_print(LOG_PROTOCOL, "ESMTP> *\n");
 213                 }
 214                 break;
 215         case SMTPAUTH_CRAM_MD5:
 216                 session->state = SMTP_AUTH_CRAM_MD5;
 217
 218                 if (!strncmp(msg, "334 ", 4)) {
 219                         gchar *response;
 220                         gchar *response64;
 221                         gchar *challenge;
 222                         gsize challengelen;
 223                         guchar hexdigest[33];
 224
 225                         challenge = g_base64_decode_zero(msg + 4, &challengelen);
 226                         log_print(LOG_PROTOCOL, "ESMTP< [Decoded: %s]\n", challenge);
 227
 228                         g_snprintf(buf, sizeof(buf), "%s", session->pass);
 229                         md5_hex_hmac(hexdigest, challenge, challengelen,
 230                                      buf, strlen(session->pass));
 231                         g_free(challenge);
 232
 233                         response = g_strdup_printf
 234                                 ("%s %s", session->user, hexdigest);
 235                         log_print(LOG_PROTOCOL, "ESMTP> [Encoded: %s]\n", response);
 236
 237                         response64 = g_base64_encode(response, strlen(response));
 238                         g_free(response);
 239
 240                         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
 241                                          response64) < 0) {
 242                                 g_free(response64);
 243                                 return SM_ERROR;
 244                         }
 245                         log_print(LOG_PROTOCOL, "ESMTP> %s\n", response64);
 246                         g_free(response64);
 247                 } else {
 248                         /* Server rejects AUTH */
 249                         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
 250                                          "*") < 0)
 251                                 return SM_ERROR;
 252                         log_print(LOG_PROTOCOL, "ESMTP> *\n");
 253                 }
 254                 break;
 255         case SMTPAUTH_DIGEST_MD5:
 256         default:
 257                 /* stop smtp_auth when no correct authtype */
 258                 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "*") < 0)
 259                         return SM_ERROR;
 260                 log_print(LOG_PROTOCOL, "ESMTP> *\n");
 261                 break;
 262         }
 263
 264         return SM_OK;
 265 }
 266
 267 static gint smtp_auth_login_user_recv(SMTPSession *session, const gchar *msg)
 268 {
 269         gchar *tmp;
 270
 271         session->state = SMTP_AUTH_LOGIN_PASS;
 272
 273         if (!strncmp(msg, "334 ", 4)) {
 274                 tmp = g_base64_encode(session->pass, strlen(session->pass));
 275         } else {
 276                 /* Server rejects AUTH */
 277                 tmp = g_strdup("*");
 278         }
 279
 280         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, tmp) < 0) {
 281                 g_free(tmp);
 282                 return SM_ERROR;
 283         }
 284         g_free(tmp);
 285
 286         log_print(LOG_PROTOCOL, "ESMTP> [PASSWORD]\n");
 287
 288         return SM_OK;
 289 }
 290
 291 static gint smtp_ehlo(SMTPSession *session)
 292 {
 293         gchar buf[MESSAGEBUFSIZE];
 294
 295         session->state = SMTP_EHLO;
 296
 297         session->avail_auth_type = 0;
 298
 299         g_snprintf(buf, sizeof(buf), "EHLO %s",
 300                    session->hostname ? session->hostname : get_domain_name());
 301         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
 302                 return SM_ERROR;
 303         log_print(LOG_PROTOCOL, "ESMTP> %s\n", buf);
 304
 305         return SM_OK;
 306 }
 307
 308 static gint smtp_ehlo_recv(SMTPSession *session, const gchar *msg)
 309 {
 310         if (strncmp(msg, "250", 3) == 0) {
 311                 const gchar *p = msg;
 312                 p += 3;
 313                 if (*p == '-' || *p == ' ') p++;
 314                 if (g_ascii_strncasecmp(p, "AUTH", 4) == 0) {
 315                         p += 5;
 316                         if (strcasestr(p, "PLAIN"))
 317                                 session->avail_auth_type |= SMTPAUTH_PLAIN;
 318                         if (strcasestr(p, "LOGIN"))
 319                                 session->avail_auth_type |= SMTPAUTH_LOGIN;
 320                         if (strcasestr(p, "CRAM-MD5"))
 321                                 session->avail_auth_type |= SMTPAUTH_CRAM_MD5;
 322                         if (strcasestr(p, "DIGEST-MD5"))
 323                                 session->avail_auth_type |= SMTPAUTH_DIGEST_MD5;
 324                 }
 325                 if (g_ascii_strncasecmp(p, "SIZE", 4) == 0) {
 326                         p += 5;
 327                         session->max_message_size = atoi(p);
 328                         session->esmtp_flags |= ESMTP_SIZE;
 329                 }
 330                 if (g_ascii_strncasecmp(p, "STARTTLS", 8) == 0) {
 331                         p += 9;
 332                         session->avail_auth_type |= SMTPAUTH_TLS_AVAILABLE;
 333                 }
 334                 return SM_OK;
 335         } else if ((msg[0] == '1' || msg[0] == '2' || msg[0] == '3') &&
 336             (msg[3] == ' ' || msg[3] == '\0'))
 337                 return SM_OK;
 338         else if (msg[0] == '5' && msg[1] == '0' &&
 339                  (msg[2] == '4' || msg[2] == '3' || msg[2] == '1'))
 340                 return SM_ERROR;
 341
 342         return SM_ERROR;
 343 }
 344
 345 #ifdef USE_GNUTLS
 346 static gint smtp_starttls(SMTPSession *session)
 347 {
 348         session->state = SMTP_STARTTLS;
 349
 350         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "STARTTLS") < 0)
 351                 return SM_ERROR;
 352         log_print(LOG_PROTOCOL, "ESMTP> STARTTLS\n");
 353
 354         return SM_OK;
 355 }
 356 #endif
 357
 358 static gint smtp_auth_cram_md5(SMTPSession *session)
 359 {
 360         session->state = SMTP_AUTH;
 361         session->auth_type = SMTPAUTH_CRAM_MD5;
 362
 363         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH CRAM-MD5") < 0)
 364                 return SM_ERROR;
 365         log_print(LOG_PROTOCOL, "ESMTP> AUTH CRAM-MD5\n");
 366
 367         return SM_OK;
 368 }
 369
 370 static gint smtp_auth_plain(SMTPSession *session)
 371 {
 372         gchar buf[MESSAGEBUFSIZE], *b64buf, *out;
 373         gint len;
 374
 375         session->state = SMTP_AUTH_PLAIN;
 376         session->auth_type = SMTPAUTH_PLAIN;
 377
 378         memset(buf, 0, sizeof buf);
 379
 380         /* "\0user\0password" */
 381         len = sprintf(buf, "%c%s%c%s", '\0', session->user, '\0', session->pass);
 382         b64buf = g_base64_encode(buf, len);
 383         out = g_strconcat("AUTH PLAIN ", b64buf, NULL);
 384         g_free(b64buf);
 385
 386         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, out) < 0) {
 387                 g_free(out);
 388                 return SM_ERROR;
 389         }
 390
 391         g_free(out);
 392
 393         log_print(LOG_PROTOCOL, "ESMTP> [AUTH PLAIN]\n");
 394
 395         return SM_OK;
 396 }
 397
 398 static gint smtp_auth_login(SMTPSession *session)
 399 {
 400         session->state = SMTP_AUTH;
 401         session->auth_type = SMTPAUTH_LOGIN;
 402
 403         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH LOGIN") < 0)
 404                 return SM_ERROR;
 405         log_print(LOG_PROTOCOL, "ESMTP> AUTH LOGIN\n");
 406
 407         return SM_OK;
 408 }
 409
 410 static gint smtp_helo(SMTPSession *session)
 411 {
 412         gchar buf[MESSAGEBUFSIZE];
 413
 414         session->state = SMTP_HELO;
 415
 416         g_snprintf(buf, sizeof(buf), "HELO %s",
 417                    session->hostname ? session->hostname : get_domain_name());
 418         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
 419                 return SM_ERROR;
 420         log_print(LOG_PROTOCOL, "SMTP> %s\n", buf);
 421
 422         return SM_OK;
 423 }
 424
 425 static gint smtp_rcpt(SMTPSession *session)
 426 {
 427         gchar buf[MESSAGEBUFSIZE];
 428         gchar *to;
 429
 430         cm_return_val_if_fail(session->cur_to != NULL, SM_ERROR);
 431
 432         session->state = SMTP_RCPT;
 433
 434         to = (gchar *)session->cur_to->data;
 435
 436         if (strchr(to, '<'))
 437                 g_snprintf(buf, sizeof(buf), "RCPT TO:%s", to);
 438         else
 439                 g_snprintf(buf, sizeof(buf), "RCPT TO:<%s>", to);
 440         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
 441                 return SM_ERROR;
 442         log_print(LOG_PROTOCOL, "SMTP> %s\n", buf);
 443
 444         session->cur_to = session->cur_to->next;
 445
 446         return SM_OK;
 447 }
 448
 449 static gint smtp_data(SMTPSession *session)
 450 {
 451         session->state = SMTP_DATA;
 452
 453         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "DATA") < 0)
 454                 return SM_ERROR;
 455         log_print(LOG_PROTOCOL, "SMTP> DATA\n");
 456
 457         return SM_OK;
 458 }
 459
 460 static gint smtp_send_data(SMTPSession *session)
 461 {
 462         session->state = SMTP_SEND_DATA;
 463
 464         session_send_data(SESSION(session), session->send_data,
 465                           session->send_data_len);
 466
 467         return SM_OK;
 468 }
 469
 470 static gint smtp_make_ready(SMTPSession *session)
 471 {
 472         session->state = SMTP_MAIL_SENT_OK;
 473
 474         return SM_OK;
 475 }
 476
 477 gint smtp_quit(SMTPSession *session)
 478 {
 479         session->state = SMTP_QUIT;
 480
 481         session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "QUIT");
 482         log_print(LOG_PROTOCOL, "SMTP> QUIT\n");
 483
 484         return SM_OK;
 485 }
 486
 487 static gint smtp_eom(SMTPSession *session)
 488 {
 489         session->state = SMTP_EOM;
 490
 491         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, ".") < 0)
 492                 return SM_ERROR;
 493         log_print(LOG_PROTOCOL, "SMTP> . (EOM)\n");
 494
 495         return SM_OK;
 496 }
 497
 498 static gint smtp_session_recv_msg(Session *session, const gchar *msg)
 499 {
 500         SMTPSession *smtp_session = SMTP_SESSION(session);
 501         gboolean cont = FALSE;
 502         gint ret = 0;
 503
 504         if (strlen(msg) < 4) {
 505                 log_warning(LOG_PROTOCOL, _("bad SMTP response\n"));
 506                 return -1;
 507         }
 508
 509         switch (smtp_session->state) {
 510         case SMTP_EHLO:
 511         case SMTP_STARTTLS:
 512         case SMTP_AUTH:
 513         case SMTP_AUTH_PLAIN:
 514         case SMTP_AUTH_LOGIN_USER:
 515         case SMTP_AUTH_LOGIN_PASS:
 516         case SMTP_AUTH_CRAM_MD5:
 517                 log_print(LOG_PROTOCOL, "ESMTP< %s\n", msg);
 518                 break;
 519         default:
 520                 log_print(LOG_PROTOCOL, "SMTP< %s\n", msg);
 521                 break;
 522         }
 523
 524         /* ignore all multiline responses except for EHLO */
 525         if (msg[3] == '-' && smtp_session->state != SMTP_EHLO)
 526                 return session_recv_msg(session);
 527
 528         if (msg[0] == '5' && msg[1] == '0' &&
 529             (msg[2] == '4' || msg[2] == '3' || msg[2] == '1')) {
 530                 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
 531                 smtp_session->state = SMTP_ERROR;
 532                 smtp_session->error_val = SM_ERROR;
 533                 g_free(smtp_session->error_msg);
 534                 smtp_session->error_msg = g_strdup(msg);
 535                 return -1;
 536         }
 537
 538         if (!strncmp(msg, "535", 3)) {
 539                 log_warning(LOG_PROTOCOL, _("error occurred on authentication\n"));
 540                 smtp_session->state = SMTP_ERROR;
 541                 smtp_session->error_val = SM_AUTHFAIL;
 542                 g_free(smtp_session->error_msg);
 543                 smtp_session->error_msg = g_strdup(msg);
 544                 return -1;
 545         }
 546
 547         if (msg[0] != '1' && msg[0] != '2' && msg[0] != '3') {
 548                 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
 549                 smtp_session->state = SMTP_ERROR;
 550                 smtp_session->error_val = SM_ERROR;
 551                 g_free(smtp_session->error_msg);
 552                 smtp_session->error_msg = g_strdup(msg);
 553                 return -1;
 554         }
 555
 556         if (msg[3] == '-')
 557                 cont = TRUE;
 558         else if (msg[3] != ' ' && msg[3] != '\0') {
 559                 log_warning(LOG_PROTOCOL, _("bad SMTP response\n"));
 560                 smtp_session->state = SMTP_ERROR;
 561                 smtp_session->error_val = SM_UNRECOVERABLE;
 562                 return -1;
 563         }
 564
 565         switch (smtp_session->state) {
 566         case SMTP_READY:
 567                 if (strstr(msg, "ESMTP"))
 568                         smtp_session->is_esmtp = TRUE;
 569 #ifdef USE_GNUTLS
 570                 if (smtp_session->user || session->ssl_type != SSL_NONE ||
 571                     smtp_session->is_esmtp)
 572 #else
 573                 if (smtp_session->user || smtp_session->is_esmtp)
 574 #endif
 575                         ret = smtp_ehlo(smtp_session);
 576                 else
 577                         ret = smtp_helo(smtp_session);
 578                 break;
 579         case SMTP_HELO:
 580                 ret = smtp_from(smtp_session);
 581                 break;
 582         case SMTP_EHLO:
 583                 ret = smtp_ehlo_recv(smtp_session, msg);
 584                 if (cont == TRUE)
 585                         break;
 586                 if (smtp_session->max_message_size > 0
 587                 && smtp_session->max_message_size <
 588                    smtp_session->send_data_len) {
 589                         log_warning(LOG_PROTOCOL, _("Message is too big "
 590                               "(Maximum size is %s)\n"),
 591                               to_human_readable(
 592                                (goffset)(smtp_session->max_message_size)));
 593                         smtp_session->state = SMTP_ERROR;
 594                         smtp_session->error_val = SM_ERROR;
 595                         return -1;
 596                 }
 597 #ifdef USE_GNUTLS
 598                 if (session->ssl_type == SSL_STARTTLS &&
 599                     smtp_session->tls_init_done == FALSE) {
 600                         ret = smtp_starttls(smtp_session);
 601                         break;
 602                 }
 603 #endif
 604                 if (smtp_session->user) {
 605                         if (smtp_auth(smtp_session) != SM_OK) {
 606 #ifdef USE_GNUTLS
 607                                 if (session->ssl_type == SSL_NONE
 608                                 &&  smtp_session->tls_init_done == FALSE
 609                                 &&  (smtp_session->avail_auth_type & SMTPAUTH_TLS_AVAILABLE))
 610                                         ret = smtp_starttls(smtp_session);
 611                                 else
 612 #endif
 613                                         ret = smtp_from(smtp_session);
 614                         }
 615                 } else
 616                         ret = smtp_from(smtp_session);
 617                 break;
 618         case SMTP_STARTTLS:
 619 #ifdef USE_GNUTLS
 620                 if (session_start_tls(session) < 0) {
 621                         log_warning(LOG_PROTOCOL, _("couldn't start TLS session\n"));
 622                         smtp_session->state = SMTP_ERROR;
 623                         smtp_session->error_val = SM_ERROR;
 624                         return -1;
 625                 }
 626                 smtp_session->tls_init_done = TRUE;
 627                 ret = smtp_ehlo(smtp_session);
 628 #endif
 629                 break;
 630         case SMTP_AUTH:
 631                 ret = smtp_auth_recv(smtp_session, msg);
 632                 break;
 633         case SMTP_AUTH_LOGIN_USER:
 634                 ret = smtp_auth_login_user_recv(smtp_session, msg);
 635                 break;
 636         case SMTP_AUTH_PLAIN:
 637         case SMTP_AUTH_LOGIN_PASS:
 638         case SMTP_AUTH_CRAM_MD5:
 639                 ret = smtp_from(smtp_session);
 640                 break;
 641         case SMTP_FROM:
 642                 if (smtp_session->cur_to)
 643                         ret = smtp_rcpt(smtp_session);
 644                 break;
 645         case SMTP_RCPT:
 646                 if (smtp_session->cur_to)
 647                         ret = smtp_rcpt(smtp_session);
 648                 else
 649                         ret = smtp_data(smtp_session);
 650                 break;
 651         case SMTP_DATA:
 652                 ret = smtp_send_data(smtp_session);
 653                 break;
 654         case SMTP_EOM:
 655                 smtp_make_ready(smtp_session);
 656                 break;
 657         case SMTP_QUIT:
 658                 session_disconnect(session);
 659                 break;
 660         case SMTP_ERROR:
 661         default:
 662                 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
 663                 smtp_session->error_val = SM_ERROR;
 664                 return -1;
 665         }
 666
 667         if (cont && ret == SM_OK)
 668                 return session_recv_msg(session);
 669
 670         if (ret != SM_OK)
 671                 smtp_session->error_val = SM_ERROR;
 672
 673         return ret == SM_OK ? 0 : -1;
 674 }
 675
 676 static gint smtp_session_send_data_finished(Session *session, guint len)
 677 {
 678         return smtp_eom(SMTP_SESSION(session));
 679 }