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, *tmp;
 222                         gsize challengelen;
 223                         guchar hexdigest[33];
 224
 225                         tmp = g_base64_decode(msg + 4, &challengelen);
 226                         challenge = g_strndup(tmp, challengelen);
 227                         g_free(tmp);
 228                         log_print(LOG_PROTOCOL, "ESMTP< [Decoded: %s]\n", challenge);
 229
 230                         g_snprintf(buf, sizeof(buf), "%s", session->pass);
 231                         md5_hex_hmac(hexdigest, challenge, challengelen,
 232                                      buf, strlen(session->pass));
 233                         g_free(challenge);
 234
 235                         response = g_strdup_printf
 236                                 ("%s %s", session->user, hexdigest);
 237                         log_print(LOG_PROTOCOL, "ESMTP> [Encoded: %s]\n", response);
 238
 239                         response64 = g_base64_encode(response, strlen(response));
 240                         g_free(response);
 241
 242                         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
 243                                          response64) < 0) {
 244                                 g_free(response64);
 245                                 return SM_ERROR;
 246                         }
 247                         log_print(LOG_PROTOCOL, "ESMTP> %s\n", response64);
 248                         g_free(response64);
 249                 } else {
 250                         /* Server rejects AUTH */
 251                         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
 252                                          "*") < 0)
 253                                 return SM_ERROR;
 254                         log_print(LOG_PROTOCOL, "ESMTP> *\n");
 255                 }
 256                 break;
 257         case SMTPAUTH_DIGEST_MD5:
 258         default:
 259                 /* stop smtp_auth when no correct authtype */
 260                 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "*") < 0)
 261                         return SM_ERROR;
 262                 log_print(LOG_PROTOCOL, "ESMTP> *\n");
 263                 break;
 264         }
 265
 266         return SM_OK;
 267 }
 268
 269 static gint smtp_auth_login_user_recv(SMTPSession *session, const gchar *msg)
 270 {
 271         gchar *tmp;
 272
 273         session->state = SMTP_AUTH_LOGIN_PASS;
 274
 275         if (!strncmp(msg, "334 ", 4)) {
 276                 tmp = g_base64_encode(session->pass, strlen(session->pass));
 277         } else {
 278                 /* Server rejects AUTH */
 279                 tmp = g_strdup("*");
 280         }
 281
 282         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, tmp) < 0) {
 283                 g_free(tmp);
 284                 return SM_ERROR;
 285         }
 286         g_free(tmp);
 287
 288         log_print(LOG_PROTOCOL, "ESMTP> [PASSWORD]\n");
 289
 290         return SM_OK;
 291 }
 292
 293 static gint smtp_ehlo(SMTPSession *session)
 294 {
 295         gchar buf[MESSAGEBUFSIZE];
 296
 297         session->state = SMTP_EHLO;
 298
 299         session->avail_auth_type = 0;
 300
 301         g_snprintf(buf, sizeof(buf), "EHLO %s",
 302                    session->hostname ? session->hostname : get_domain_name());
 303         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
 304                 return SM_ERROR;
 305         log_print(LOG_PROTOCOL, "ESMTP> %s\n", buf);
 306
 307         return SM_OK;
 308 }
 309
 310 static gint smtp_ehlo_recv(SMTPSession *session, const gchar *msg)
 311 {
 312         if (strncmp(msg, "250", 3) == 0) {
 313                 const gchar *p = msg;
 314                 p += 3;
 315                 if (*p == '-' || *p == ' ') p++;
 316                 if (g_ascii_strncasecmp(p, "AUTH", 4) == 0) {
 317                         p += 5;
 318                         if (strcasestr(p, "PLAIN"))
 319                                 session->avail_auth_type |= SMTPAUTH_PLAIN;
 320                         if (strcasestr(p, "LOGIN"))
 321                                 session->avail_auth_type |= SMTPAUTH_LOGIN;
 322                         if (strcasestr(p, "CRAM-MD5"))
 323                                 session->avail_auth_type |= SMTPAUTH_CRAM_MD5;
 324                         if (strcasestr(p, "DIGEST-MD5"))
 325                                 session->avail_auth_type |= SMTPAUTH_DIGEST_MD5;
 326                 }
 327                 if (g_ascii_strncasecmp(p, "SIZE", 4) == 0) {
 328                         p += 5;
 329                         session->max_message_size = atoi(p);
 330                         session->esmtp_flags |= ESMTP_SIZE;
 331                 }
 332                 if (g_ascii_strncasecmp(p, "STARTTLS", 8) == 0) {
 333                         p += 9;
 334                         session->avail_auth_type |= SMTPAUTH_TLS_AVAILABLE;
 335                 }
 336                 return SM_OK;
 337         } else if ((msg[0] == '1' || msg[0] == '2' || msg[0] == '3') &&
 338             (msg[3] == ' ' || msg[3] == '\0'))
 339                 return SM_OK;
 340         else if (msg[0] == '5' && msg[1] == '0' &&
 341                  (msg[2] == '4' || msg[2] == '3' || msg[2] == '1'))
 342                 return SM_ERROR;
 343
 344         return SM_ERROR;
 345 }
 346
 347 #ifdef USE_GNUTLS
 348 static gint smtp_starttls(SMTPSession *session)
 349 {
 350         session->state = SMTP_STARTTLS;
 351
 352         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "STARTTLS") < 0)
 353                 return SM_ERROR;
 354         log_print(LOG_PROTOCOL, "ESMTP> STARTTLS\n");
 355
 356         return SM_OK;
 357 }
 358 #endif
 359
 360 static gint smtp_auth_cram_md5(SMTPSession *session)
 361 {
 362         session->state = SMTP_AUTH;
 363         session->auth_type = SMTPAUTH_CRAM_MD5;
 364
 365         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH CRAM-MD5") < 0)
 366                 return SM_ERROR;
 367         log_print(LOG_PROTOCOL, "ESMTP> AUTH CRAM-MD5\n");
 368
 369         return SM_OK;
 370 }
 371
 372 static gint smtp_auth_plain(SMTPSession *session)
 373 {
 374         gchar buf[MESSAGEBUFSIZE], *b64buf, *out;
 375         gint len;
 376
 377         session->state = SMTP_AUTH_PLAIN;
 378         session->auth_type = SMTPAUTH_PLAIN;
 379
 380         memset(buf, 0, sizeof buf);
 381
 382         /* "\0user\0password" */
 383         len = sprintf(buf, "%c%s%c%s", '\0', session->user, '\0', session->pass);
 384         b64buf = g_base64_encode(buf, len);
 385         out = g_strconcat("AUTH PLAIN ", b64buf, NULL);
 386         g_free(b64buf);
 387
 388         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, out) < 0) {
 389                 g_free(out);
 390                 return SM_ERROR;
 391         }
 392
 393         g_free(out);
 394
 395         log_print(LOG_PROTOCOL, "ESMTP> [AUTH PLAIN]\n");
 396
 397         return SM_OK;
 398 }
 399
 400 static gint smtp_auth_login(SMTPSession *session)
 401 {
 402         session->state = SMTP_AUTH;
 403         session->auth_type = SMTPAUTH_LOGIN;
 404
 405         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH LOGIN") < 0)
 406                 return SM_ERROR;
 407         log_print(LOG_PROTOCOL, "ESMTP> AUTH LOGIN\n");
 408
 409         return SM_OK;
 410 }
 411
 412 static gint smtp_helo(SMTPSession *session)
 413 {
 414         gchar buf[MESSAGEBUFSIZE];
 415
 416         session->state = SMTP_HELO;
 417
 418         g_snprintf(buf, sizeof(buf), "HELO %s",
 419                    session->hostname ? session->hostname : get_domain_name());
 420         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
 421                 return SM_ERROR;
 422         log_print(LOG_PROTOCOL, "SMTP> %s\n", buf);
 423
 424         return SM_OK;
 425 }
 426
 427 static gint smtp_rcpt(SMTPSession *session)
 428 {
 429         gchar buf[MESSAGEBUFSIZE];
 430         gchar *to;
 431
 432         cm_return_val_if_fail(session->cur_to != NULL, SM_ERROR);
 433
 434         session->state = SMTP_RCPT;
 435
 436         to = (gchar *)session->cur_to->data;
 437
 438         if (strchr(to, '<'))
 439                 g_snprintf(buf, sizeof(buf), "RCPT TO:%s", to);
 440         else
 441                 g_snprintf(buf, sizeof(buf), "RCPT TO:<%s>", to);
 442         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
 443                 return SM_ERROR;
 444         log_print(LOG_PROTOCOL, "SMTP> %s\n", buf);
 445
 446         session->cur_to = session->cur_to->next;
 447
 448         return SM_OK;
 449 }
 450
 451 static gint smtp_data(SMTPSession *session)
 452 {
 453         session->state = SMTP_DATA;
 454
 455         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "DATA") < 0)
 456                 return SM_ERROR;
 457         log_print(LOG_PROTOCOL, "SMTP> DATA\n");
 458
 459         return SM_OK;
 460 }
 461
 462 static gint smtp_send_data(SMTPSession *session)
 463 {
 464         session->state = SMTP_SEND_DATA;
 465
 466         session_send_data(SESSION(session), session->send_data,
 467                           session->send_data_len);
 468
 469         return SM_OK;
 470 }
 471
 472 static gint smtp_make_ready(SMTPSession *session)
 473 {
 474         session->state = SMTP_MAIL_SENT_OK;
 475
 476         return SM_OK;
 477 }
 478
 479 gint smtp_quit(SMTPSession *session)
 480 {
 481         session->state = SMTP_QUIT;
 482
 483         session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "QUIT");
 484         log_print(LOG_PROTOCOL, "SMTP> QUIT\n");
 485
 486         return SM_OK;
 487 }
 488
 489 static gint smtp_eom(SMTPSession *session)
 490 {
 491         session->state = SMTP_EOM;
 492
 493         if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, ".") < 0)
 494                 return SM_ERROR;
 495         log_print(LOG_PROTOCOL, "SMTP> . (EOM)\n");
 496
 497         return SM_OK;
 498 }
 499
 500 static gint smtp_session_recv_msg(Session *session, const gchar *msg)
 501 {
 502         SMTPSession *smtp_session = SMTP_SESSION(session);
 503         gboolean cont = FALSE;
 504         gint ret = 0;
 505
 506         if (strlen(msg) < 4) {
 507                 log_warning(LOG_PROTOCOL, _("bad SMTP response\n"));
 508                 return -1;
 509         }
 510
 511         switch (smtp_session->state) {
 512         case SMTP_EHLO:
 513         case SMTP_STARTTLS:
 514         case SMTP_AUTH:
 515         case SMTP_AUTH_PLAIN:
 516         case SMTP_AUTH_LOGIN_USER:
 517         case SMTP_AUTH_LOGIN_PASS:
 518         case SMTP_AUTH_CRAM_MD5:
 519                 log_print(LOG_PROTOCOL, "ESMTP< %s\n", msg);
 520                 break;
 521         default:
 522                 log_print(LOG_PROTOCOL, "SMTP< %s\n", msg);
 523                 break;
 524         }
 525
 526         /* ignore all multiline responses except for EHLO */
 527         if (msg[3] == '-' && smtp_session->state != SMTP_EHLO)
 528                 return session_recv_msg(session);
 529
 530         if (msg[0] == '5' && msg[1] == '0' &&
 531             (msg[2] == '4' || msg[2] == '3' || msg[2] == '1')) {
 532                 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
 533                 smtp_session->state = SMTP_ERROR;
 534                 smtp_session->error_val = SM_ERROR;
 535                 g_free(smtp_session->error_msg);
 536                 smtp_session->error_msg = g_strdup(msg);
 537                 return -1;
 538         }
 539
 540         if (!strncmp(msg, "535", 3)) {
 541                 log_warning(LOG_PROTOCOL, _("error occurred on authentication\n"));
 542                 smtp_session->state = SMTP_ERROR;
 543                 smtp_session->error_val = SM_AUTHFAIL;
 544                 g_free(smtp_session->error_msg);
 545                 smtp_session->error_msg = g_strdup(msg);
 546                 return -1;
 547         }
 548
 549         if (msg[0] != '1' && msg[0] != '2' && msg[0] != '3') {
 550                 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
 551                 smtp_session->state = SMTP_ERROR;
 552                 smtp_session->error_val = SM_ERROR;
 553                 g_free(smtp_session->error_msg);
 554                 smtp_session->error_msg = g_strdup(msg);
 555                 return -1;
 556         }
 557
 558         if (msg[3] == '-')
 559                 cont = TRUE;
 560         else if (msg[3] != ' ' && msg[3] != '\0') {
 561                 log_warning(LOG_PROTOCOL, _("bad SMTP response\n"));
 562                 smtp_session->state = SMTP_ERROR;
 563                 smtp_session->error_val = SM_UNRECOVERABLE;
 564                 return -1;
 565         }
 566
 567         switch (smtp_session->state) {
 568         case SMTP_READY:
 569                 if (strstr(msg, "ESMTP"))
 570                         smtp_session->is_esmtp = TRUE;
 571 #ifdef USE_GNUTLS
 572                 if (smtp_session->user || session->ssl_type != SSL_NONE ||
 573                     smtp_session->is_esmtp)
 574 #else
 575                 if (smtp_session->user || smtp_session->is_esmtp)
 576 #endif
 577                         ret = smtp_ehlo(smtp_session);
 578                 else
 579                         ret = smtp_helo(smtp_session);
 580                 break;
 581         case SMTP_HELO:
 582                 ret = smtp_from(smtp_session);
 583                 break;
 584         case SMTP_EHLO:
 585                 ret = smtp_ehlo_recv(smtp_session, msg);
 586                 if (cont == TRUE)
 587                         break;
 588                 if (smtp_session->max_message_size > 0
 589                 && smtp_session->max_message_size <
 590                    smtp_session->send_data_len) {
 591                         log_warning(LOG_PROTOCOL, _("Message is too big "
 592                               "(Maximum size is %s)\n"),
 593                               to_human_readable(
 594                                (goffset)(smtp_session->max_message_size)));
 595                         smtp_session->state = SMTP_ERROR;
 596                         smtp_session->error_val = SM_ERROR;
 597                         return -1;
 598                 }
 599 #ifdef USE_GNUTLS
 600                 if (session->ssl_type == SSL_STARTTLS &&
 601                     smtp_session->tls_init_done == FALSE) {
 602                         ret = smtp_starttls(smtp_session);
 603                         break;
 604                 }
 605 #endif
 606                 if (smtp_session->user) {
 607                         if (smtp_auth(smtp_session) != SM_OK) {
 608 #ifdef USE_GNUTLS
 609                                 if (session->ssl_type == SSL_NONE
 610                                 &&  smtp_session->tls_init_done == FALSE
 611                                 &&  (smtp_session->avail_auth_type & SMTPAUTH_TLS_AVAILABLE))
 612                                         ret = smtp_starttls(smtp_session);
 613                                 else
 614 #endif
 615                                         ret = smtp_from(smtp_session);
 616                         }
 617                 } else
 618                         ret = smtp_from(smtp_session);
 619                 break;
 620         case SMTP_STARTTLS:
 621 #ifdef USE_GNUTLS
 622                 if (session_start_tls(session) < 0) {
 623                         log_warning(LOG_PROTOCOL, _("couldn't start TLS session\n"));
 624                         smtp_session->state = SMTP_ERROR;
 625                         smtp_session->error_val = SM_ERROR;
 626                         return -1;
 627                 }
 628                 smtp_session->tls_init_done = TRUE;
 629                 ret = smtp_ehlo(smtp_session);
 630 #endif
 631                 break;
 632         case SMTP_AUTH:
 633                 ret = smtp_auth_recv(smtp_session, msg);
 634                 break;
 635         case SMTP_AUTH_LOGIN_USER:
 636                 ret = smtp_auth_login_user_recv(smtp_session, msg);
 637                 break;
 638         case SMTP_AUTH_PLAIN:
 639         case SMTP_AUTH_LOGIN_PASS:
 640         case SMTP_AUTH_CRAM_MD5:
 641                 ret = smtp_from(smtp_session);
 642                 break;
 643         case SMTP_FROM:
 644                 if (smtp_session->cur_to)
 645                         ret = smtp_rcpt(smtp_session);
 646                 break;
 647         case SMTP_RCPT:
 648                 if (smtp_session->cur_to)
 649                         ret = smtp_rcpt(smtp_session);
 650                 else
 651                         ret = smtp_data(smtp_session);
 652                 break;
 653         case SMTP_DATA:
 654                 ret = smtp_send_data(smtp_session);
 655                 break;
 656         case SMTP_EOM:
 657                 smtp_make_ready(smtp_session);
 658                 break;
 659         case SMTP_QUIT:
 660                 session_disconnect(session);
 661                 break;
 662         case SMTP_ERROR:
 663         default:
 664                 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
 665                 smtp_session->error_val = SM_ERROR;
 666                 return -1;
 667         }
 668
 669         if (cont && ret == SM_OK)
 670                 return session_recv_msg(session);
 671
 672         if (ret != SM_OK)
 673                 smtp_session->error_val = SM_ERROR;
 674
 675         return ret == SM_OK ? 0 : -1;
 676 }
 677
 678 static gint smtp_session_send_data_finished(Session *session, guint len)
 679 {
 680         return smtp_eom(SMTP_SESSION(session));
 681 }