pop_lib.c 9.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61
/*
 * Copyright (C) 2000 Vsevolod Volkov <vvv@mutt.org.ua>
 * 
 *     This program is free software; you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation; either version 2 of the License, or
 *     (at your option) any later version.
 * 
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 * 
 *     You should have received a copy of the GNU General Public License
 *     along with this program; if not, write to the Free Software
 *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 */

#include "mutt.h"
#include "mx.h"
#include "url.h"
#include "pop.h"

#include <string.h>
#include <unistd.h>
#include <ctype.h>

/* given an POP mailbox name, return host, port, username and password */
int pop_parse_path (const char* path, ACCOUNT* acct)
{
  ciss_url_t url;
  char *c;
  int ret = -1;

  /* Defaults */
  acct->flags = 0;
  acct->port = POP_PORT;
  acct->type = M_ACCT_TYPE_POP;

  c = safe_strdup (path);
  url_parse_ciss (&url, c);

  if (url.scheme == U_POP || url.scheme == U_POPS)
  {
    if (url.scheme == U_POPS)
    {
      acct->flags |= M_ACCT_SSL;
      acct->port = POP_SSL_PORT;
    }

    if ((!url.path || !*url.path) && mutt_account_fromurl (acct, &url) == 0)
      ret = 0;
  }

  FREE (&c);
  return ret;
}

/* Copy error message to err_msg buffer */
void pop_error (POP_DATA *pop_data, char *msg)
{
62
  char *t, *c, *c2;
63

64
  t = strchr (pop_data->err_msg, '\0');
65 66 67 68 69 70 71 72 73 74 75
  c = msg;

  if (!mutt_strncmp (msg, "-ERR ", 5))
  {
    c2 = msg + 5;
    SKIPWS (c2);

    if (*c2)
      c = c2;
  }

76
  strfcpy (t, c, sizeof (pop_data->err_msg) - strlen (pop_data->err_msg));
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117
  mutt_remove_trailing_ws (pop_data->err_msg);
}

/* Parse CAPA output */
static int fetch_capa (char *line, void *data)
{
  POP_DATA *pop_data = (POP_DATA *)data;
  char *c;

  if (!mutt_strncmp (line, "SASL", 4))
  {
    c = line + 4;
    SKIPWS (c);
    pop_data->auth_list = safe_strdup (c);
  }

  else if (!mutt_strncmp (line, "USER", 4))
    pop_data->cmd_user = 1;

  else if (!mutt_strncmp (line, "UIDL", 4))
    pop_data->cmd_uidl = 1;

  else if (!mutt_strncmp (line, "TOP", 3))
    pop_data->cmd_top = 1;

  return 0;
}

/* Fetch list of the authentication mechanisms */
static int fetch_auth (char *line, void *data)
{
  POP_DATA *pop_data = (POP_DATA *)data;

  if (!pop_data->auth_list)
  {
    pop_data->auth_list = safe_malloc (strlen (line) + 1);
    *pop_data->auth_list = '\0';
  }
  else
  {
    safe_realloc ((void **) &pop_data->auth_list,
118 119
	    strlen (pop_data->auth_list) + strlen (line) + 2);
    strcat (pop_data->auth_list, " ");	/* __STRCAT_CHECKED__ */
120
  }
121
  strcat (pop_data->auth_list, line);	/* __STRCAT_CHECKED__ */
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211

  return 0;
}

/*
 * Get capabilities
 *  0 - successful,
 * -1 - conection lost,
 * -2 - execution error.
*/
static int pop_capabilities (POP_DATA *pop_data)
{
  char buf[LONG_STRING];
  char *msg = NULL;

  if (pop_data->capabilities)
    return 0;

  pop_data->cmd_capa = 0;
  pop_data->cmd_user = 0;
  pop_data->cmd_uidl = 0;
  pop_data->cmd_top = 0;
  pop_data->resp_codes = 0;
  pop_data->expire = 1;
  pop_data->login_delay = 0;
  FREE (&pop_data->auth_list);

  strfcpy (buf, "CAPA\r\n", sizeof (buf));
  switch (pop_fetch_data (pop_data, buf, NULL, fetch_capa, pop_data))
  {
    case 0:
    {
      pop_data->cmd_capa = 1;

      if (!pop_data->expire)
	msg = _("Unable to leave messages on server.");
      if (!pop_data->cmd_top)
	msg = _("Command TOP is not supported by server.");
      if (!pop_data->cmd_uidl)
	msg = _("Command UIDL is not supported by server.");
      break;
    }
    case -1:
      return -1;
  }

  if (!pop_data->cmd_capa)
  {
    pop_data->cmd_user = 2;
    pop_data->cmd_uidl = 2;
    pop_data->cmd_top = 2;

    strfcpy (buf, "AUTH\r\n", sizeof (buf));
    if (pop_fetch_data (pop_data, buf, NULL, fetch_auth, pop_data) == -1)
      return -1;
  }

  if (msg)
  {
    mutt_error (msg);
    return -2;
  }

  pop_data->capabilities = 1;

  return 0;
}

/*
 * Open connection
 *  0 - successful,
 * -1 - conection lost,
 * -2 - invalid response.
*/
int pop_connect (POP_DATA *pop_data)
{
  char buf[LONG_STRING];

  pop_data->status = POP_NONE;
  if (mutt_socket_open (pop_data->conn) < 0 ||
      mutt_socket_readln (buf, sizeof (buf), pop_data->conn) < 0)
  {
    mutt_error (_("Error connecting to server: %s"), pop_data->conn->account.host);
    return -1;
  }

  pop_data->status = POP_CONNECTED;

  if (mutt_strncmp (buf, "+OK", 3))
  {
212
    *pop_data->err_msg = '\0';
213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317
    pop_error (pop_data, buf);
    mutt_error ("%s", pop_data->err_msg);
    return -2;
  }

  pop_apop_timestamp (pop_data, buf);

  return 0;
}

/*
 * Open connection and authenticate
 *  0 - successful,
 * -1 - conection lost,
 * -2 - invalid command or execution error,
 * -3 - authentication canceled.
*/
int pop_open_connection (POP_DATA *pop_data)
{
  int ret;
  char buf[LONG_STRING];

  ret = pop_connect (pop_data);
  if (ret < 0)
  {
    sleep (2);
    return ret;
  }

  ret = pop_capabilities (pop_data);
  if (ret == -1)
    goto err_conn;
  if (ret == -2)
  {
    sleep (2);
    return -2;
  }

  ret = pop_authenticate (pop_data);
  if (ret == -1)
    goto err_conn;
  if (ret != 0)
    return ret;

  /* get total size of mailbox */
  strfcpy (buf, "STAT\r\n", sizeof (buf));
  ret = pop_query (pop_data, buf, sizeof (buf));
  if (ret == -1)
    goto err_conn;
  if (ret == -2)
  {
    mutt_error ("%s", pop_data->err_msg);
    sleep (2);
    return ret;
  }

  sscanf (buf, "+OK %d %d", &ret, &pop_data->size);
  return 0;

err_conn:
  pop_data->status = POP_DISCONNECTED;
  mutt_error _("Server closed connection!");
  sleep (2);
  return -1;
}

/* logout from POP server */
void pop_logout (CONTEXT *ctx)
{
  int ret = 0;
  char buf[LONG_STRING];
  POP_DATA *pop_data = (POP_DATA *)ctx->data;

  if (pop_data->status == POP_CONNECTED)
  {
    mutt_message _("Closing connection to POP server...");

    if (ctx->readonly)
    {
      strfcpy (buf, "RSET\r\n", sizeof (buf));
      ret = pop_query (pop_data, buf, sizeof (buf));
    }

    if (ret != -1)
    {
      strfcpy (buf, "QUIT\r\n", sizeof (buf));
      pop_query (pop_data, buf, sizeof (buf));
    }

    mutt_clear_error ();
  }

  pop_data->status = POP_DISCONNECTED;
  return;
}

/*
 * Send data from buffer and receive answer to the same buffer
 *  0 - successful,
 * -1 - conection lost,
 * -2 - invalid command or execution error.
*/
int pop_query_d (POP_DATA *pop_data, char *buf, size_t buflen, char *msg)
{
  int dbg = M_SOCK_LOG_CMD;
318
  char *c;
319 320 321 322 323 324 325 326 327 328 329 330 331 332

  if (pop_data->status != POP_CONNECTED)
    return -1;

#ifdef DEBUG
    /* print msg instaed of real command */
    if (msg)
    {
      dbg = M_SOCK_LOG_FULL;
      dprint (M_SOCK_LOG_CMD, (debugfile, "> %s", msg));
    }
#endif

  mutt_socket_write_d (pop_data->conn, buf, dbg);
333 334 335 336 337

  c = strpbrk (buf, " \r\n");
  *c = '\0';
  snprintf (pop_data->err_msg, sizeof (pop_data->err_msg), "%s: ", buf);

338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480
  if (mutt_socket_readln (buf, buflen, pop_data->conn) < 0)
  {
    pop_data->status = POP_DISCONNECTED;
    return -1;
  }
  if (!mutt_strncmp (buf, "+OK", 3))
    return 0;

  pop_error (pop_data, buf);
  return -2;
}

/*
 * This function calls  funct(*line, *data)  for each received line,
 * funct(NULL, *data)  if  rewind(*data)  needs, exits when fail or done.
 * Returned codes:
 *  0 - successful,
 * -1 - conection lost,
 * -2 - invalid command or execution error,
 * -3 - error in funct(*line, *data)
 */
int pop_fetch_data (POP_DATA *pop_data, char *query, char *msg,
		    int (*funct) (char *, void *), void *data)
{
  char buf[LONG_STRING];
  char *inbuf;
  char *p;
  int ret, chunk, line = 0;
  size_t lenbuf = 0;

  strfcpy (buf, query, sizeof (buf));
  ret = pop_query (pop_data, buf, sizeof (buf));
  if (ret < 0)
    return ret;

  inbuf = safe_malloc (sizeof (buf));

  FOREVER
  {
    chunk = mutt_socket_readln_d (buf, sizeof (buf), pop_data->conn, M_SOCK_LOG_HDR);
    if (chunk < 0)
    {
      pop_data->status = POP_DISCONNECTED;
      ret = -1;
      break;
    }

    p = buf;
    if (!lenbuf && buf[0] == '.')
    {
      if (buf[1] != '.')
	break;
      p++;
    }

    strfcpy (inbuf + lenbuf, p, sizeof (buf));

    if (chunk >= sizeof (buf))
    {
      lenbuf += strlen (p);
    }
    else
    {
      line++;
      if (msg && ReadInc && (line % ReadInc == 0))
	mutt_message ("%s %d", msg, line);
      if (ret == 0 && funct (inbuf, data) < 0)
	ret = -3;
      lenbuf = 0;
    }

    safe_realloc ((void **) &inbuf, lenbuf + sizeof (buf));
  }

  FREE (&inbuf);
  return ret;
}

/* find message with this UIDL and set refno */
static int check_uidl (char *line, void *data)
{
  int i, index;
  CONTEXT *ctx = (CONTEXT *)data;

  sscanf (line, "%d %s", &index, line);
  for (i = 0; i < ctx->msgcount; i++)
  {
    if (!mutt_strcmp (ctx->hdrs[i]->data, line))
    {
      ctx->hdrs[i]->refno = index;
      break;
    }
  }

  return 0;
}

/* reconnect and verify idnexes if connection was lost */
int pop_reconnect (CONTEXT *ctx)
{
  int ret;
  POP_DATA *pop_data = (POP_DATA *)ctx->data;

  if (pop_data->status == POP_CONNECTED)
    return 0;
  if (pop_data->status == POP_BYE)
    return -1;

  FOREVER
  {
    mutt_socket_close (pop_data->conn);

    ret = pop_open_connection (pop_data);
    if (ret == 0)
    {
      char *msg = _("Verifying message indexes...");
      int i;

      for (i = 0; i < ctx->msgcount; i++)
	ctx->hdrs[i]->refno = -1;

      mutt_message (msg);

      ret = pop_fetch_data (pop_data, "UIDL\r\n", msg, check_uidl, ctx);
      if (ret == -2)
      {
        mutt_error ("%s", pop_data->err_msg);
        sleep (2);
      }
    }
    if (ret == 0)
      return 0;

    pop_logout (ctx);

    if (ret < -1)
      return -1;

    if (query_quadoption (OPT_POPRECONNECT,
		_("Connection lost. Reconnect to POP server?")) != M_YES)
      return -1;
  }
}