pop.c 35.9 KB
Newer Older
Richard M. Stallman's avatar
Richard M. Stallman committed
1
/* pop.c: client routines for talking to a POP3-protocol post-office server
2
   Copyright (c) 1991, 1993, 1996, 1997, 1999 Free Software Foundation, Inc.
Richard M. Stallman's avatar
Richard M. Stallman committed
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
   Written by Jonathan Kamens, jik@security.ov.com.

This file is part of GNU Emacs.

GNU Emacs 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, or (at your option)
any later version.

GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
19 20
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
21

22 23
#ifdef HAVE_CONFIG_H
#define NO_SHORTNAMES	/* Tell config not to load remap.h */
Richard M. Stallman's avatar
Richard M. Stallman committed
24
#include <../src/config.h>
25 26 27
#else
#define MAIL_USE_POP
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
28

29 30
#ifdef MAIL_USE_POP

Richard M. Stallman's avatar
Richard M. Stallman committed
31
#include <sys/types.h>
32 33 34 35
#ifdef WINDOWSNT
#include "ntlib.h"
#include <winsock.h>
#undef SOCKET_ERROR
36 37 38
#define RECV(s,buf,len,flags) recv(s,buf,len,flags)
#define SEND(s,buf,len,flags) send(s,buf,len,flags)
#define CLOSESOCKET(s) closesocket(s)
39
#else
Richard M. Stallman's avatar
Richard M. Stallman committed
40 41
#include <netinet/in.h>
#include <sys/socket.h>
42 43 44
#define RECV(s,buf,len,flags) read(s,buf,len)
#define SEND(s,buf,len,flags) write(s,buf,len)
#define CLOSESOCKET(s) close(s)
45
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
46
#include <pop.h>
47

Richard M. Stallman's avatar
Richard M. Stallman committed
48 49
#ifdef sun
#include <malloc.h>
50
#endif /* sun */
51

Richard M. Stallman's avatar
Richard M. Stallman committed
52 53 54 55 56 57 58 59 60 61
#ifdef HESIOD
#include <hesiod.h>
/*
 * It really shouldn't be necessary to put this declaration here, but
 * the version of hesiod.h that Athena has installed in release 7.2
 * doesn't declare this function; I don't know if the 7.3 version of
 * hesiod.h does.
 */
extern struct servent *hes_getservbyname (/* char *, char * */);
#endif
62

Richard M. Stallman's avatar
Richard M. Stallman committed
63 64 65 66
#include <pwd.h>
#include <netdb.h>
#include <errno.h>
#include <stdio.h>
67 68
#ifdef STDC_HEADERS
#include <string.h>
69 70 71 72
#define index strchr
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
73
#endif
74

Richard M. Stallman's avatar
Richard M. Stallman committed
75
#ifdef KERBEROS
76 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
# ifdef HAVE_KRB5_H
#  include <krb5.h>
# endif
# ifdef HAVE_DES_H
#  include <des.h>
# else
#  ifdef HAVE_KERBEROSIV_DES_H
#   include <kerberosIV/des.h>
#  else
#   ifdef HAVE_KERBEROS_DES_H
#    include <kerberos/des.h>
#   endif
#  endif
# endif
# ifdef HAVE_KRB_H
#  include <krb.h>
# else
#  ifdef HAVE_KERBEROSIV_KRB_H
#   include <kerberosIV/krb.h>
#  else
#   ifdef HAVE_KERBEROS_KRB_H
#    include <kerberos/krb.h>
#   endif
#  endif
# endif
# ifdef HAVE_COM_ERR_H
#  include <com_err.h>
# endif
104
#endif /* KERBEROS */
Richard M. Stallman's avatar
Richard M. Stallman committed
105

106
#ifdef KERBEROS
107
#ifndef KERBEROS5
Richard M. Stallman's avatar
Richard M. Stallman committed
108
extern int krb_sendauth (/* long, int, KTEXT, char *, char *, char *,
109 110 111
			    u_long, MSG_DAT *, CREDENTIALS *, Key_schedule,
			    struct sockaddr_in *, struct sockaddr_in *,
			    char * */);
Richard M. Stallman's avatar
Richard M. Stallman committed
112
extern char *krb_realmofhost (/* char * */);
113
#endif /* ! KERBEROS5 */
114
#endif /* KERBEROS */
Richard M. Stallman's avatar
Richard M. Stallman committed
115

116
#ifndef WINDOWSNT
117
#if !defined(HAVE_H_ERRNO) || !defined(HAVE_CONFIG_H)
Richard M. Stallman's avatar
Richard M. Stallman committed
118 119
extern int h_errno;
#endif
120
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
121

122 123 124 125 126 127 128 129 130
#ifndef _P
# ifdef __STDC__
#  define _P(a) a
# else
#  define _P(a) ()
# endif /* __STDC__ */
#endif /* ! __P */

static int socket_connection _P((char *, int));
131
static int pop_getline _P((popserver, char **));
132 133 134
static int sendline _P((popserver, char *));
static int fullwrite _P((int, char *, int));
static int getok _P((popserver));
Richard M. Stallman's avatar
Richard M. Stallman committed
135
#if 0
136
static int gettermination _P((popserver));
Richard M. Stallman's avatar
Richard M. Stallman committed
137
#endif
138 139
static void pop_trash _P((popserver));
static char *find_crlf _P((char *, int));
140

Dave Love's avatar
Dave Love committed
141 142
#define ERROR_MAX 160		/* a pretty arbitrary size, but needs
				   to be bigger than the one-time 80 */
Richard M. Stallman's avatar
Richard M. Stallman committed
143 144
#define POP_PORT 110
#define KPOP_PORT 1109
145
#define POP_SERVICE "pop3"	/* we don't want the POP2 port! */
Richard M. Stallman's avatar
Richard M. Stallman committed
146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257
#ifdef KERBEROS
#define KPOP_SERVICE "kpop"
#endif

char pop_error[ERROR_MAX];
int pop_debug = 0;

#ifndef min
#define min(a,b) (((a) < (b)) ? (a) : (b))
#endif

/*
 * Function: pop_open (char *host, char *username, char *password,
 * 		       int flags)
 *
 * Purpose: Establishes a connection with a post-office server, and
 * 	completes the authorization portion of the session.
 *
 * Arguments:
 * 	host	The server host with which the connection should be
 * 		established.  Optional.  If omitted, internal
 * 		heuristics will be used to determine the server host,
 * 		if possible.
 * 	username
 * 		The username of the mail-drop to access.  Optional.
 * 		If omitted, internal heuristics will be used to
 * 		determine the username, if possible.
 * 	password
 * 		The password to use for authorization.  If omitted,
 * 		internal heuristics will be used to determine the
 * 		password, if possible.
 * 	flags	A bit mask containing flags controlling certain
 * 		functions of the routine.  Valid flags are defined in
 * 		the file pop.h
 *
 * Return value: Upon successful establishment of a connection, a
 * 	non-null popserver will be returned.  Otherwise, null will be
 * 	returned, and the string variable pop_error will contain an
 * 	explanation of the error.
 */
popserver
pop_open (host, username, password, flags)
     char *host;
     char *username;
     char *password;
     int flags;
{
  int sock;
  popserver server;

  /* Determine the user name */
  if (! username)
    {
      username = getenv ("USER");
      if (! (username && *username))
	{
	  username = getlogin ();
	  if (! (username && *username))
	    {
	      struct passwd *passwd;
	      passwd = getpwuid (getuid ());
	      if (passwd && passwd->pw_name && *passwd->pw_name)
		{
		  username = passwd->pw_name;
		}
	      else
		{
		  strcpy (pop_error, "Could not determine username");
		  return (0);
		}
	    }
	}
    }

  /*
   *  Determine the mail host.
   */

  if (! host)
    {
      host = getenv ("MAILHOST");
    }

#ifdef HESIOD
  if ((! host) && (! (flags & POP_NO_HESIOD)))
    {
      struct hes_postoffice *office;
      office = hes_getmailhost (username);
      if (office && office->po_type && (! strcmp (office->po_type, "POP"))
	  && office->po_name && *office->po_name && office->po_host
	  && *office->po_host)
	{
	  host = office->po_host;
	  username = office->po_name;
	}
    }
#endif

#ifdef MAILHOST
  if (! host)
    {
      host = MAILHOST;
    }
#endif

  if (! host)
    {
      strcpy (pop_error, "Could not determine POP server");
      return (0);
    }

  /* Determine the password */
Richard M. Stallman's avatar
Richard M. Stallman committed
258 259
#ifdef KERBEROS
#define DONT_NEED_PASSWORD (! (flags & POP_NO_KERBEROS))
Richard M. Stallman's avatar
Richard M. Stallman committed
260
#else
Richard M. Stallman's avatar
Richard M. Stallman committed
261
#define DONT_NEED_PASSWORD 0
Richard M. Stallman's avatar
Richard M. Stallman committed
262 263 264 265 266 267 268 269 270 271 272 273 274 275 276
#endif
 
  if ((! password) && (! DONT_NEED_PASSWORD))
    {
      if (! (flags & POP_NO_GETPASS))
	{
	  password = getpass ("Enter POP password:");
	}
      if (! password)
	{
	  strcpy (pop_error, "Could not determine POP password");
	  return (0);
	}
    }
  if (password)
Richard M. Stallman's avatar
Richard M. Stallman committed
277
    flags |= POP_NO_KERBEROS;
Richard M. Stallman's avatar
Richard M. Stallman committed
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
  else
    password = username;

  sock = socket_connection (host, flags);
  if (sock == -1)
    return (0);

  server = (popserver) malloc (sizeof (struct _popserver));
  if (! server)
    {
      strcpy (pop_error, "Out of memory in pop_open");
      return (0);
    }
  server->buffer = (char *) malloc (GETLINE_MIN);
  if (! server->buffer)
    {
      strcpy (pop_error, "Out of memory in pop_open");
      free ((char *) server);
      return (0);
    }
	  
  server->file = sock;
  server->data = 0;
  server->buffer_index = 0;
  server->buffer_size = GETLINE_MIN;
  server->in_multi = 0;
304
  server->trash_started = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369

  if (getok (server))
    return (0);

  /*
   * I really shouldn't use the pop_error variable like this, but....
   */
  if (strlen (username) > ERROR_MAX - 6)
    {
      pop_close (server);
      strcpy (pop_error,
	      "Username too long; recompile pop.c with larger ERROR_MAX");
      return (0);
    }
  sprintf (pop_error, "USER %s", username);

  if (sendline (server, pop_error) || getok (server))
    {
      return (0);
    }

  if (strlen (password) > ERROR_MAX - 6)
    {
      pop_close (server);
      strcpy (pop_error,
	      "Password too long; recompile pop.c with larger ERROR_MAX");
      return (0);
    }
  sprintf (pop_error, "PASS %s", password);

  if (sendline (server, pop_error) || getok (server))
    {
      return (0);
    }

  return (server);
}

/*
 * Function: pop_stat
 *
 * Purpose: Issue the STAT command to the server and return (in the
 * 	value parameters) the number of messages in the maildrop and
 * 	the total size of the maildrop.
 *
 * Return value: 0 on success, or non-zero with an error in pop_error
 * 	in failure.
 *
 * Side effects: On failure, may make further operations on the
 * 	connection impossible.
 */
int
pop_stat (server, count, size)
     popserver server;
     int *count;
     int *size;
{
  char *fromserver;

  if (server->in_multi)
    {
      strcpy (pop_error, "In multi-line query in pop_stat");
      return (-1);
    }
     
370
  if (sendline (server, "STAT") || (pop_getline (server, &fromserver) < 0))
Richard M. Stallman's avatar
Richard M. Stallman committed
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
    return (-1);

  if (strncmp (fromserver, "+OK ", 4))
    {
      if (0 == strncmp (fromserver, "-ERR", 4))
	{
	  strncpy (pop_error, fromserver, ERROR_MAX);
	}
      else
	{
	  strcpy (pop_error,
		  "Unexpected response from POP server in pop_stat");
	  pop_trash (server);
	}
      return (-1);
    }

  *count = atoi (&fromserver[4]);
     
  fromserver = index (&fromserver[4], ' ');
  if (! fromserver)
    {
      strcpy (pop_error,
	      "Badly formatted response from server in pop_stat");
      pop_trash (server);
      return (-1);
    }

  *size = atoi (fromserver + 1);

  return (0);
}

/*
 * Function: pop_list
 *
 * Purpose: Performs the POP "list" command and returns (in value
 * 	parameters) two malloc'd zero-terminated arrays -- one of
 * 	message IDs, and a parallel one of sizes.
 *
 * Arguments:
 * 	server	The pop connection to talk to.
 * 	message	The number of the one message about which to get
 * 		information, or 0 to get information about all
 * 		messages.
 *
 * Return value: 0 on success, non-zero with error in pop_error on
 * 	failure.
 *
 * Side effects: On failure, may make further operations on the
 * 	connection impossible.
 */
int
pop_list (server, message, IDs, sizes)
     popserver server;
     int message;
     int **IDs;
     int **sizes;
{
  int how_many, i;
  char *fromserver;

  if (server->in_multi)
    {
      strcpy (pop_error, "In multi-line query in pop_list");
      return (-1);
    }

  if (message)
    how_many = 1;
  else
    {
      int count, size;
      if (pop_stat (server, &count, &size))
	return (-1);
      how_many = count;
    }

  *IDs = (int *) malloc ((how_many + 1) * sizeof (int));
  *sizes = (int *) malloc ((how_many + 1) * sizeof (int));
  if (! (*IDs && *sizes))
    {
      strcpy (pop_error, "Out of memory in pop_list");
      return (-1);
    }

  if (message)
    {
      sprintf (pop_error, "LIST %d", message);
      if (sendline (server, pop_error))
	{
	  free ((char *) *IDs);
	  free ((char *) *sizes);
	  return (-1);
	}
466
      if (pop_getline (server, &fromserver) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510
	{
	  free ((char *) *IDs);
	  free ((char *) *sizes);
	  return (-1);
	}
      if (strncmp (fromserver, "+OK ", 4))
	{
	  if (! strncmp (fromserver, "-ERR", 4))
	    strncpy (pop_error, fromserver, ERROR_MAX);
	  else
	    {
	      strcpy (pop_error,
		      "Unexpected response from server in pop_list");
	      pop_trash (server);
	    }
	  free ((char *) *IDs);
	  free ((char *) *sizes);
	  return (-1);
	}
      (*IDs)[0] = atoi (&fromserver[4]);
      fromserver = index (&fromserver[4], ' ');
      if (! fromserver)
	{
	  strcpy (pop_error,
		  "Badly formatted response from server in pop_list");
	  pop_trash (server);
	  free ((char *) *IDs);
	  free ((char *) *sizes);
	  return (-1);
	}
      (*sizes)[0] = atoi (fromserver);
      (*IDs)[1] = (*sizes)[1] = 0;
      return (0);
    }
  else
    {
      if (pop_multi_first (server, "LIST", &fromserver))
	{
	  free ((char *) *IDs);
	  free ((char *) *sizes);
	  return (-1);
	}
      for (i = 0; i < how_many; i++)
	{
511
	  if (pop_multi_next (server, &fromserver) <= 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529
	    {
	      free ((char *) *IDs);
	      free ((char *) *sizes);
	      return (-1);
	    }
	  (*IDs)[i] = atoi (fromserver);
	  fromserver = index (fromserver, ' ');
	  if (! fromserver)
	    {
	      strcpy (pop_error,
		      "Badly formatted response from server in pop_list");
	      free ((char *) *IDs);
	      free ((char *) *sizes);
	      pop_trash (server);
	      return (-1);
	    }
	  (*sizes)[i] = atoi (fromserver);
	}
530
      if (pop_multi_next (server, &fromserver) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559
	{
	  free ((char *) *IDs);
	  free ((char *) *sizes);
	  return (-1);
	}
      else if (fromserver)
	{
	  strcpy (pop_error,
		  "Too many response lines from server in pop_list");
	  free ((char *) *IDs);
	  free ((char *) *sizes);
	  return (-1);
	}
      (*IDs)[i] = (*sizes)[i] = 0;
      return (0);
    }
}

/*
 * Function: pop_retrieve
 *
 * Purpose: Retrieve a specified message from the maildrop.
 *
 * Arguments:
 * 	server	The server to retrieve from.
 * 	message	The message number to retrieve.
 *	markfrom
 * 		If true, then mark the string "From " at the beginning
 * 		of lines with '>'.
560 561
 *	msg_buf	Output parameter to which a buffer containing the
 * 		message is assigned.
Richard M. Stallman's avatar
Richard M. Stallman committed
562
 * 
563 564 565
 * Return value: The number of bytes in msg_buf, which may contain
 * 	embedded nulls, not including its final null, or -1 on error
 * 	with pop_error set.
Richard M. Stallman's avatar
Richard M. Stallman committed
566 567 568
 *
 * Side effects: May kill connection on error.
 */
569 570
int
pop_retrieve (server, message, markfrom, msg_buf)
Richard M. Stallman's avatar
Richard M. Stallman committed
571 572 573
     popserver server;
     int message;
     int markfrom;
574
     char **msg_buf;
Richard M. Stallman's avatar
Richard M. Stallman committed
575 576 577 578 579 580 581 582
{
  int *IDs, *sizes, bufsize, fromcount = 0, cp = 0;
  char *ptr, *fromserver;
  int ret;

  if (server->in_multi)
    {
      strcpy (pop_error, "In multi-line query in pop_retrieve");
583
      return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
584 585 586
    }

  if (pop_list (server, message, &IDs, &sizes))
587
    return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
588 589 590

  if (pop_retrieve_first (server, message, &fromserver))
    {
591
      return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
592 593 594 595 596 597 598 599 600
    }

  /*
   * The "5" below is an arbitrary constant -- I assume that if
   * there are "From" lines in the text to be marked, there
   * probably won't be more than 5 of them.  If there are, I
   * allocate more space for them below.
   */
  bufsize = sizes[0] + (markfrom ? 5 : 0);
601
  ptr = (char *)malloc (bufsize);
Richard M. Stallman's avatar
Richard M. Stallman committed
602 603 604 605 606 607 608
  free ((char *) IDs);
  free ((char *) sizes);

  if (! ptr)
    {
      strcpy (pop_error, "Out of memory in pop_retrieve");
      pop_retrieve_flush (server);
609
      return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
610 611
    }

612
  while ((ret = pop_retrieve_next (server, &fromserver)) >= 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
613 614 615 616
    {
      if (! fromserver)
	{
	  ptr[cp] = '\0';
617 618
	  *msg_buf = ptr;
	  return (cp);
Richard M. Stallman's avatar
Richard M. Stallman committed
619 620 621 622 623 624 625 626
	}
      if (markfrom && fromserver[0] == 'F' && fromserver[1] == 'r' &&
	  fromserver[2] == 'o' && fromserver[3] == 'm' &&
	  fromserver[4] == ' ')
	{
	  if (++fromcount == 5)
	    {
	      bufsize += 5;
627
	      ptr = (char *)realloc (ptr, bufsize);
Richard M. Stallman's avatar
Richard M. Stallman committed
628 629 630 631
	      if (! ptr)
		{
		  strcpy (pop_error, "Out of memory in pop_retrieve");
		  pop_retrieve_flush (server);
632
		  return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
633 634 635 636 637
		}
	      fromcount = 0;
	    }
	  ptr[cp++] = '>';
	}
638 639
      bcopy (fromserver, &ptr[cp], ret);
      cp += ret;
Richard M. Stallman's avatar
Richard M. Stallman committed
640 641 642
      ptr[cp++] = '\n';
    }

643 644
  free (ptr);
  return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
645 646 647 648 649 650 651 652 653 654 655 656
}     

int
pop_retrieve_first (server, message, response)
     popserver server;
     int message;
     char **response;
{
  sprintf (pop_error, "RETR %d", message);
  return (pop_multi_first (server, pop_error, response));
}

657 658 659 660 661 662 663 664
/*
  Returns a negative number on error, 0 to indicate that the data has
  all been read (i.e., the server has returned a "." termination
  line), or a positive number indicating the number of bytes in the
  returned buffer (which is null-terminated and may contain embedded
  nulls, but the returned bytecount doesn't include the final null).
  */

Richard M. Stallman's avatar
Richard M. Stallman committed
665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
int
pop_retrieve_next (server, line)
     popserver server;
     char **line;
{
  return (pop_multi_next (server, line));
}

int
pop_retrieve_flush (server)
     popserver server;
{
  return (pop_multi_flush (server));
}

int
pop_top_first (server, message, lines, response)
     popserver server;
     int message, lines;
     char **response;
{
  sprintf (pop_error, "TOP %d %d", message, lines);
  return (pop_multi_first (server, pop_error, response));
}

690 691 692 693 694 695 696 697
/*
  Returns a negative number on error, 0 to indicate that the data has
  all been read (i.e., the server has returned a "." termination
  line), or a positive number indicating the number of bytes in the
  returned buffer (which is null-terminated and may contain embedded
  nulls, but the returned bytecount doesn't include the final null).
  */

Richard M. Stallman's avatar
Richard M. Stallman committed
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
int
pop_top_next (server, line)
     popserver server;
     char **line;
{
  return (pop_multi_next (server, line));
}

int
pop_top_flush (server)
     popserver server;
{
  return (pop_multi_flush (server));
}

int
pop_multi_first (server, command, response)
     popserver server;
     char *command;
     char **response;
{
  if (server->in_multi)
    {
      strcpy (pop_error,
	      "Already in multi-line query in pop_multi_first");
      return (-1);
    }

726
  if (sendline (server, command) || (pop_getline (server, response) < 0))
Richard M. Stallman's avatar
Richard M. Stallman committed
727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749
    {
      return (-1);
    }

  if (0 == strncmp (*response, "-ERR", 4))
    {
      strncpy (pop_error, *response, ERROR_MAX);
      return (-1);
    }
  else if (0 == strncmp (*response, "+OK", 3))
    {
      for (*response += 3; **response == ' '; (*response)++) /* empty */;
      server->in_multi = 1;
      return (0);
    }
  else
    {
      strcpy (pop_error,
	      "Unexpected response from server in pop_multi_first");
      return (-1);
    }
}

750 751 752 753 754 755 756 757 758
/*
  Read the next line of data from SERVER and place a pointer to it
  into LINE.  Return -1 on error, 0 if there are no more lines to read
  (i.e., the server has returned a line containing only "."), or a
  positive number indicating the number of bytes in the LINE buffer
  (not including the final null).  The data in that buffer may contain
  embedded nulls, but does not contain the final CRLF. When returning
  0, LINE is set to null. */

Richard M. Stallman's avatar
Richard M. Stallman committed
759 760 761 762 763 764
int
pop_multi_next (server, line)
     popserver server;
     char **line;
{
  char *fromserver;
765
  int ret;
Richard M. Stallman's avatar
Richard M. Stallman committed
766 767 768 769 770 771 772

  if (! server->in_multi)
    {
      strcpy (pop_error, "Not in multi-line query in pop_multi_next");
      return (-1);
    }

773
  if ((ret = pop_getline (server, &fromserver)) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
774 775 776 777 778 779 780 781 782 783 784 785 786 787 788
    {
      return (-1);
    }

  if (fromserver[0] == '.')
    {
      if (! fromserver[1])
	{
	  *line = 0;
	  server->in_multi = 0;
	  return (0);
	}
      else
	{
	  *line = fromserver + 1;
789
	  return (ret - 1);
Richard M. Stallman's avatar
Richard M. Stallman committed
790 791 792 793 794
	}
    }
  else
    {
      *line = fromserver;
795
      return (ret);
Richard M. Stallman's avatar
Richard M. Stallman committed
796 797 798 799 800 801 802 803
    }
}

int
pop_multi_flush (server)
     popserver server;
{
  char *line;
804
  int ret;
Richard M. Stallman's avatar
Richard M. Stallman committed
805 806 807 808 809 810

  if (! server->in_multi)
    {
      return (0);
    }

811
  while ((ret = pop_multi_next (server, &line)))
Richard M. Stallman's avatar
Richard M. Stallman committed
812
    {
813 814
      if (ret < 0)
	return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
815 816
    }

817
  return (0);
Richard M. Stallman's avatar
Richard M. Stallman committed
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907
}

/* Function: pop_delete
 *
 * Purpose: Delete a specified message.
 *
 * Arguments:
 * 	server	Server from which to delete the message.
 * 	message	Message to delete.
 *
 * Return value: 0 on success, non-zero with error in pop_error
 * 	otherwise.
 */
int
pop_delete (server, message)
     popserver server;
     int message;
{
  if (server->in_multi)
    {
      strcpy (pop_error, "In multi-line query in pop_delete");
      return (-1);
    }

  sprintf (pop_error, "DELE %d", message);

  if (sendline (server, pop_error) || getok (server))
    return (-1);

  return (0);
}

/*
 * Function: pop_noop
 *
 * Purpose: Send a noop command to the server.
 *
 * Argument:
 * 	server	The server to send to.
 *
 * Return value: 0 on success, non-zero with error in pop_error
 * 	otherwise.
 *
 * Side effects: Closes connection on error.
 */
int
pop_noop (server)
     popserver server;
{
  if (server->in_multi)
    {
      strcpy (pop_error, "In multi-line query in pop_noop");
      return (-1);
    }

  if (sendline (server, "NOOP") || getok (server))
    return (-1);

  return (0);
}

/*
 * Function: pop_last
 *
 * Purpose: Find out the highest seen message from the server.
 *
 * Arguments:
 * 	server	The server.
 *
 * Return value: If successful, the highest seen message, which is
 * 	greater than or equal to 0.  Otherwise, a negative number with
 * 	the error explained in pop_error.
 *
 * Side effects: Closes the connection on error.
 */
int
pop_last (server)
     popserver server;
{
  char *fromserver;
     
  if (server->in_multi)
    {
      strcpy (pop_error, "In multi-line query in pop_last");
      return (-1);
    }

  if (sendline (server, "LAST"))
    return (-1);

908
  if (pop_getline (server, &fromserver) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966
    return (-1);

  if (! strncmp (fromserver, "-ERR", 4))
    {
      strncpy (pop_error, fromserver, ERROR_MAX);
      return (-1);
    }
  else if (strncmp (fromserver, "+OK ", 4))
    {
      strcpy (pop_error, "Unexpected response from server in pop_last");
      pop_trash (server);
      return (-1);
    }
  else
    {
      return (atoi (&fromserver[4]));
    }
}

/*
 * Function: pop_reset
 *
 * Purpose: Reset the server to its initial connect state
 *
 * Arguments:
 * 	server	The server.
 *
 * Return value: 0 for success, non-0 with error in pop_error
 * 	otherwise.
 *
 * Side effects: Closes the connection on error.
 */
int
pop_reset (server)
     popserver server;
{
  if (pop_retrieve_flush (server))
    {
      return (-1);
    }

  if (sendline (server, "RSET") || getok (server))
    return (-1);

  return (0);
}

/*
 * Function: pop_quit
 *
 * Purpose: Quit the connection to the server,
 *
 * Arguments:
 * 	server	The server to quit.
 *
 * Return value: 0 for success, non-zero otherwise with error in
 * 	pop_error.
 *
Karl Heuer's avatar
Karl Heuer committed
967
 * Side Effects: The popserver passed in is unusable after this
Richard M. Stallman's avatar
Richard M. Stallman committed
968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997
 * 	function is called, even if an error occurs.
 */
int
pop_quit (server)
     popserver server;
{
  int ret = 0;

  if (server->file >= 0)
    {
      if (pop_retrieve_flush (server))
	{
	  ret = -1;
	}

      if (sendline (server, "QUIT") || getok (server))
	{
	  ret = -1;
	}

      close (server->file);
    }

  if (server->buffer)
    free (server->buffer);
  free ((char *) server);

  return (ret);
}

998 999 1000 1001
#ifdef WINDOWSNT
static int have_winsock = 0;
#endif

Richard M. Stallman's avatar
Richard M. Stallman committed
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
/*
 * Function: socket_connection
 *
 * Purpose: Opens the network connection with the mail host, without
 * 	doing any sort of I/O with it or anything.
 *
 * Arguments:
 * 	host	The host to which to connect.
 *	flags	Option flags.
 * 	
 * Return value: A file descriptor indicating the connection, or -1
 * 	indicating failure, in which case an error has been copied
 * 	into pop_error.
 */
static int
socket_connection (host, flags)
     char *host;
     int flags;
{
  struct hostent *hostent;
  struct servent *servent;
  struct sockaddr_in addr;
  char found_port = 0;
  char *service;
  int sock;
#ifdef KERBEROS
1028
#ifdef KERBEROS5
Richard M. Stallman's avatar
Richard M. Stallman committed
1029
  krb5_error_code rem;
1030 1031
  krb5_context kcontext = 0;
  krb5_auth_context auth_context = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
  krb5_ccache ccdef;
  krb5_principal client, server;
  krb5_error *err_ret;
  register char *cp;
#else
  KTEXT ticket;
  MSG_DAT msg_data;
  CREDENTIALS cred;
  Key_schedule schedule;
  int rem;
1042
  char *realhost;
1043
#endif /* KERBEROS5 */
Richard M. Stallman's avatar
Richard M. Stallman committed
1044 1045 1046 1047
#endif /* KERBEROS */

  int try_count = 0;

1048 1049 1050 1051 1052 1053 1054 1055
#ifdef WINDOWSNT
  {
    WSADATA winsockData;
    if (WSAStartup (0x101, &winsockData) == 0)
      have_winsock = 1;
  }
#endif

Richard M. Stallman's avatar
Richard M. Stallman committed
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
  do
    {
      hostent = gethostbyname (host);
      try_count++;
      if ((! hostent) && ((h_errno != TRY_AGAIN) || (try_count == 5)))
	{
	  strcpy (pop_error, "Could not determine POP server's address");
	  return (-1);
	}
    } while (! hostent);

  bzero ((char *) &addr, sizeof (addr));
  addr.sin_family = AF_INET;

#ifdef KERBEROS
  service = (flags & POP_NO_KERBEROS) ? POP_SERVICE : KPOP_SERVICE;
#else
  service = POP_SERVICE;
#endif

#ifdef HESIOD
  if (! (flags & POP_NO_HESIOD))
    {
      servent = hes_getservbyname (service, "tcp");
      if (servent)
	{
	  addr.sin_port = servent->s_port;
	  found_port = 1;
	}
    }
#endif
  if (! found_port)
    {
      servent = getservbyname (service, "tcp");
      if (servent)
	{
	  addr.sin_port = servent->s_port;
	}
      else
	{
#ifdef KERBEROS
	  addr.sin_port = htons ((flags & POP_NO_KERBEROS) ?
				POP_PORT : KPOP_PORT);
#else
	  addr.sin_port = htons (POP_PORT);
#endif
	}
    }

1105
#define POP_SOCKET_ERROR "Could not create socket for POP connection: "
Richard M. Stallman's avatar
Richard M. Stallman committed
1106 1107 1108 1109

  sock = socket (PF_INET, SOCK_STREAM, 0);
  if (sock < 0)
    {
1110
      strcpy (pop_error, POP_SOCKET_ERROR);
Richard M. Stallman's avatar
Richard M. Stallman committed
1111
      strncat (pop_error, strerror (errno),
1112
	       ERROR_MAX - sizeof (POP_SOCKET_ERROR));
Richard M. Stallman's avatar
Richard M. Stallman committed
1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
      return (-1);
	  
    }

  while (*hostent->h_addr_list)
    {
      bcopy (*hostent->h_addr_list, (char *) &addr.sin_addr,
	     hostent->h_length);
      if (! connect (sock, (struct sockaddr *) &addr, sizeof (addr)))
	break;
      hostent->h_addr_list++;
    }

#define CONNECT_ERROR "Could not connect to POP server: "
     
  if (! *hostent->h_addr_list)
    {
1130
      CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
      strcpy (pop_error, CONNECT_ERROR);
      strncat (pop_error, strerror (errno),
	       ERROR_MAX - sizeof (CONNECT_ERROR));
      return (-1);
	  
    }

#ifdef KERBEROS
#define KRB_ERROR "Kerberos error connecting to POP server: "
  if (! (flags & POP_NO_KERBEROS))
    {
1142 1143
#ifdef KERBEROS5
      if ((rem = krb5_init_context (&kcontext)))
Richard M. Stallman's avatar
Richard M. Stallman committed
1144 1145
	{
	krb5error:
1146 1147 1148 1149
	  if (auth_context)
	    krb5_auth_con_free (kcontext, auth_context);
	  if (kcontext)
	    krb5_free_context (kcontext);
Richard M. Stallman's avatar
Richard M. Stallman committed
1150 1151 1152
	  strcpy (pop_error, KRB_ERROR);
	  strncat (pop_error, error_message (rem),
		   ERROR_MAX - sizeof(KRB_ERROR));
1153
	  CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1154 1155 1156
	  return (-1);
	}

1157 1158 1159 1160 1161 1162 1163 1164
      if ((rem = krb5_auth_con_init (kcontext, &auth_context)))
	goto krb5error;
      
      if (rem = krb5_cc_default (kcontext, &ccdef))
	goto krb5error;

      if (rem = krb5_cc_get_principal (kcontext, ccdef, &client))
	goto krb5error;
Richard M. Stallman's avatar
Richard M. Stallman committed
1165 1166 1167 1168 1169 1170 1171 1172 1173

      for (cp = hostent->h_name; *cp; cp++)
	{
	  if (isupper (*cp))
	    {
	      *cp = tolower (*cp);
	    }
	}

1174 1175 1176
      if (rem = krb5_sname_to_principal (kcontext, hostent->h_name,
					 POP_SERVICE, FALSE, &server))
	goto krb5error;
Richard M. Stallman's avatar
Richard M. Stallman committed
1177

1178 1179
      rem = krb5_sendauth (kcontext, &auth_context,
			   (krb5_pointer) &sock, "KPOPV1.0", client, server,
Richard M. Stallman's avatar
Richard M. Stallman committed
1180 1181 1182 1183 1184
			  AP_OPTS_MUTUAL_REQUIRED,
			  0,	/* no checksum */
			  0,	/* no creds, use ccache instead */
			  ccdef,
			  &err_ret,
1185
			  0,	/* don't need subsession key */
Richard M. Stallman's avatar
Richard M. Stallman committed
1186
			  0);	/* don't need reply */
1187
      krb5_free_principal (kcontext, server);
Richard M. Stallman's avatar
Richard M. Stallman committed
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
      if (rem)
	{
	  if (err_ret && err_ret->text.length)
	    {
	      strcpy (pop_error, KRB_ERROR);
	      strncat (pop_error, error_message (rem),
		       ERROR_MAX - sizeof (KRB_ERROR));
	      strncat (pop_error, " [server says '",
		       ERROR_MAX - strlen (pop_error) - 1);
	      strncat (pop_error, err_ret->text.data,
		       min (ERROR_MAX - strlen (pop_error) - 1,
			    err_ret->text.length));
	      strncat (pop_error, "']",
		       ERROR_MAX - strlen (pop_error) - 1);
	    }
	  else
	    {
	      strcpy (pop_error, KRB_ERROR);
	      strncat (pop_error, error_message (rem),
		       ERROR_MAX - sizeof (KRB_ERROR));
	    }
	  if (err_ret)
1210 1211 1212
	    krb5_free_error (kcontext, err_ret);
	  krb5_auth_con_free (kcontext, auth_context);
	  krb5_free_context (kcontext);
Richard M. Stallman's avatar
Richard M. Stallman committed
1213

1214
	  CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1215 1216
	  return (-1);
	}
1217
#else  /* ! KERBEROS5 */	  
Richard M. Stallman's avatar
Richard M. Stallman committed
1218
      ticket = (KTEXT) malloc (sizeof (KTEXT_ST));
1219 1220 1221
      realhost = strdup (hostent->h_name);
      rem = krb_sendauth (0L, sock, ticket, "pop", realhost,
			  (char *) krb_realmofhost (realhost),
Richard M. Stallman's avatar
Richard M. Stallman committed
1222 1223 1224 1225 1226
			  (unsigned long) 0, &msg_data, &cred, schedule,
			  (struct sockaddr_in *) 0,
			  (struct sockaddr_in *) 0,
			  "KPOPV0.1");
      free ((char *) ticket);
1227
      free (realhost);
Richard M. Stallman's avatar
Richard M. Stallman committed
1228 1229 1230 1231 1232
      if (rem != KSUCCESS)
	{
	  strcpy (pop_error, KRB_ERROR);
	  strncat (pop_error, krb_err_txt[rem],
		   ERROR_MAX - sizeof (KRB_ERROR));
1233
	  CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1234 1235
	  return (-1);
	}
1236
#endif /* KERBEROS5 */
Richard M. Stallman's avatar
Richard M. Stallman committed
1237 1238 1239 1240 1241 1242 1243
    }
#endif /* KERBEROS */

  return (sock);
} /* socket_connection */

/*
1244
 * Function: pop_getline
Richard M. Stallman's avatar
Richard M. Stallman committed
1245 1246 1247 1248 1249 1250 1251 1252 1253
 *
 * Purpose: Get a line of text from the connection and return a
 * 	pointer to it.  The carriage return and linefeed at the end of
 * 	the line are stripped, but periods at the beginnings of lines
 * 	are NOT dealt with in any special way.
 *
 * Arguments:
 * 	server	The server from which to get the line of text.
 *
1254 1255 1256 1257 1258
 * Returns: The number of characters in the line, which is returned in
 * 	LINE, not including the final null.  A return value of 0
 * 	indicates a blank line.  A negative return value indicates an
 * 	error (in which case the contents of LINE are undefined.  In
 * 	case of error, an error message is copied into pop_error.
Richard M. Stallman's avatar
Richard M. Stallman committed
1259
 *
1260
 * Notes: The line returned is overwritten with each call to pop_getline.
Richard M. Stallman's avatar
Richard M. Stallman committed
1261 1262
 *
 * Side effects: Closes the connection on error.
1263 1264
 *
 * THE RETURNED LINE MAY CONTAIN EMBEDDED NULLS!
Richard M. Stallman's avatar
Richard M. Stallman committed
1265
 */
1266
static int
1267
pop_getline (server, line)
Richard M. Stallman's avatar
Richard M. Stallman committed
1268
     popserver server;
1269
     char **line;
Richard M. Stallman's avatar
Richard M. Stallman committed
1270 1271 1272 1273
{
#define GETLINE_ERROR "Error reading from server: "

  int ret;
1274 1275
  int search_offset = 0;

Richard M. Stallman's avatar
Richard M. Stallman committed
1276 1277
  if (server->data)
    {
1278 1279
      char *cp = find_crlf (server->buffer + server->buffer_index,
			    server->data);
Richard M. Stallman's avatar
Richard M. Stallman committed
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
      if (cp)
	{
	  int found;
	  int data_used;

	  found = server->buffer_index;
	  data_used = (cp + 2) - server->buffer - found;
	       
	  *cp = '\0';		/* terminate the string to be returned */
	  server->data -= data_used;
	  server->buffer_index += data_used;

	  if (pop_debug)
1293 1294
	    /* Embedded nulls will truncate this output prematurely,
	       but that's OK because it's just for debugging anyway. */
Richard M. Stallman's avatar
Richard M. Stallman committed
1295
	    fprintf (stderr, "<<< %s\n", server->buffer + found);
1296 1297
	  *line = server->buffer + found;
	  return (data_used - 2);
Richard M. Stallman's avatar
Richard M. Stallman committed
1298 1299 1300 1301 1302
	}
      else
	{
	  bcopy (server->buffer + server->buffer_index,
		 server->buffer, server->data);
1303 1304 1305 1306 1307 1308 1309 1310
	  /* Record the fact that we've searched the data already in
             the buffer for a CRLF, so that when we search below, we
             don't have to search the same data twice.  There's a "-
             1" here to account for the fact that the last character
             of the data we have may be the CR of a CRLF pair, of
             which we haven't read the second half yet, so we may have
             to search it again when we read more data. */
	  search_offset = server->data - 1;
Richard M. Stallman's avatar
Richard M. Stallman committed
1311 1312 1313 1314 1315 1316 1317 1318 1319 1320
	  server->buffer_index = 0;
	}
    }
  else
    {
      server->buffer_index = 0;
    }

  while (1)
    {
Richard M. Stallman's avatar
Richard M. Stallman committed
1321 1322 1323 1324
      /* There's a "- 1" here to leave room for the null that we put
         at the end of the read data below.  We put the null there so
         that find_crlf knows where to stop when we call it. */
      if (server->data == server->buffer_size - 1)
Richard M. Stallman's avatar
Richard M. Stallman committed
1325
	{
Richard M. Stallman's avatar
Richard M. Stallman committed
1326 1327 1328
	  server->buffer_size += GETLINE_INCR;
	  server->buffer = (char *)realloc (server->buffer, server->buffer_size);
	  if (! server->buffer)
Richard M. Stallman's avatar
Richard M. Stallman committed
1329
	    {
Richard M. Stallman's avatar
Richard M. Stallman committed
1330 1331 1332
	      strcpy (pop_error, "Out of memory in pop_getline");
	      pop_trash (server);
	      return (-1);
Karl Heuer's avatar
Karl Heuer committed
1333 1334
	    }
	}
Richard M. Stallman's avatar
Richard M. Stallman committed
1335 1336
      ret = RECV (server->file, server->buffer + server->data,
		  server->buffer_size - server->data - 1, 0);
Richard M. Stallman's avatar
Richard M. Stallman committed
1337 1338 1339 1340 1341 1342
      if (ret < 0)
	{
	  strcpy (pop_error, GETLINE_ERROR);
	  strncat (pop_error, strerror (errno),
		   ERROR_MAX - sizeof (GETLINE_ERROR));
	  pop_trash (server);
1343
	  return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
1344 1345 1346
	}
      else if (ret == 0)
	{
1347
	  strcpy (pop_error, "Unexpected EOF from server in pop_getline");
Richard M. Stallman's avatar
Richard M. Stallman committed
1348
	  pop_trash (server);
1349
	  return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
1350 1351 1352
	}
      else
	{
1353
	  char *cp;
Richard M. Stallman's avatar
Richard M. Stallman committed
1354
	  server->data += ret;
1355
	  server->buffer[server->data] = '\0';
Richard M. Stallman's avatar
Richard M. Stallman committed
1356
	       
1357 1358
	  cp = find_crlf (server->buffer + search_offset,
			  server->data - search_offset);
Richard M. Stallman's avatar
Richard M. Stallman committed
1359 1360 1361 1362 1363 1364 1365 1366 1367
	  if (cp)
	    {
	      int data_used = (cp + 2) - server->buffer;
	      *cp = '\0';
	      server->data -= data_used;
	      server->buffer_index = data_used;

	      if (pop_debug)
		fprintf (stderr, "<<< %s\n", server->buffer);
1368 1369
	      *line = server->buffer;
	      return (data_used - 2);
Richard M. Stallman's avatar
Richard M. Stallman committed
1370
	    }
1371 1372 1373
	  /* As above, the "- 1" here is to account for the fact that
	     we may have read a CR without its accompanying LF. */
	  search_offset += ret - 1;
Richard M. Stallman's avatar
Richard M. Stallman committed
1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
	}
    }

  /* NOTREACHED */
}

/*
 * Function: sendline
 *
 * Purpose: Sends a line of text to the POP server.  The line of text
 * 	passed into this function should NOT have the carriage return
 * 	and linefeed on the end of it.  Periods at beginnings of lines
 * 	will NOT be treated specially by this function.
 *
 * Arguments:
 * 	server	The server to which to send the text.
 * 	line	The line of text to send.
 *
 * Return value: Upon successful completion, a value of 0 will be
 * 	returned.  Otherwise, a non-zero value will be returned, and
 * 	an error will be copied into pop_error.
 *
 * Side effects: Closes the connection on error.
 */
static int
sendline (server, line)
     popserver server;
     char *line;
{
#define SENDLINE_ERROR "Error writing to POP server: "
  int ret;

Richard M. Stallman's avatar
Richard M. Stallman committed
1406 1407 1408 1409
  ret = fullwrite (server->file, line, strlen (line));
  if (ret >= 0)
    {				/* 0 indicates that a blank line was written */
      ret = fullwrite (server->file, "\r\n", 2);
Richard M. Stallman's avatar
Richard M. Stallman committed
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441
    }

  if (ret < 0)
    {
      pop_trash (server);
      strcpy (pop_error, SENDLINE_ERROR);
      strncat (pop_error, strerror (errno),
	       ERROR_MAX - sizeof (SENDLINE_ERROR));
      return (ret);
    }

  if (pop_debug)
    fprintf (stderr, ">>> %s\n", line);

  return (0);
}

/*
 * Procedure: fullwrite
 *
 * Purpose: Just like write, but keeps trying until the entire string
 * 	has been written.
 *
 * Return value: Same as write.  Pop_error is not set.
 */
static int
fullwrite (fd, buf, nbytes)
     int fd;
     char *buf;
     int nbytes;
{
  char *cp;
1442
  int ret = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
1443 1444

  cp = buf;
1445
  while (nbytes && ((ret = SEND (fd, cp, nbytes, 0)) > 0))
Richard M. Stallman's avatar
Richard M. Stallman committed
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
    {
      cp += ret;
      nbytes -= ret;
    }

  return (ret);
}

/*
 * Procedure getok
 *
 * Purpose: Reads a line from the server.  If the return indicator is
 * 	positive, return with a zero exit status.  If not, return with
 * 	a negative exit status.
 *
 * Arguments:
 * 	server	The server to read from.
 * 
 * Returns: 0 for success, else for failure and puts error in pop_error.
 *
Karl Heuer's avatar
Karl Heuer committed
1466
 * Side effects: On failure, may make the connection unusable.
Richard M. Stallman's avatar
Richard M. Stallman committed
1467 1468 1469 1470 1471 1472 1473
 */
static int
getok (server)
     popserver server;
{
  char *fromline;

1474
  if (pop_getline (server, &fromline) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512
    {
      return (-1);
    }

  if (! strncmp (fromline, "+OK", 3))
    return (0);
  else if (! strncmp (fromline, "-ERR", 4))
    {
      strncpy (pop_error, fromline, ERROR_MAX);
      pop_error[ERROR_MAX-1] = '\0';
      return (-1);
    }
  else
    {
      strcpy (pop_error,
	      "Unexpected response from server; expecting +OK or -ERR");
      pop_trash (server);
      return (-1);
    }
}	  

#if 0
/*
 * Function: gettermination
 *
 * Purpose: Gets the next line and verifies that it is a termination
 * 	line (nothing but a dot).
 *
 * Return value: 0 on success, non-zero with pop_error set on error.
 *
 * Side effects: Closes the connection on error.
 */
static int
gettermination (server)
     popserver server;
{
  char *fromserver;

1513
  if (pop_getline (server, &fromserver) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535
    return (-1);

  if (strcmp (fromserver, "."))
    {
      strcpy (pop_error,
	      "Unexpected response from server in gettermination");
      pop_trash (server);
      return (-1);
    }

  return (0);
}
#endif

/*
 * Function pop_close
 *
 * Purpose: Close a pop connection, sending a "RSET" command to try to
 * 	preserve any changes that were made and a "QUIT" command to
 * 	try to get the server to quit, but ignoring any responses that
 * 	are received.
 *
Karl Heuer's avatar
Karl Heuer committed
1536
 * Side effects: The server is unusable after this function returns.
Richard M. Stallman's avatar
Richard M. Stallman committed
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562
 * 	Changes made to the maildrop since the session was started (or
 * 	since the last pop_reset) may be lost.
 */
void 
pop_close (server)
     popserver server;
{
  pop_trash (server);
  free ((char *) server);

  return;
}

/*
 * Function: pop_trash
 *
 * Purpose: Like pop_close or pop_quit, but doesn't deallocate the
 * 	memory associated with the server.  It is legal to call
 * 	pop_close or pop_quit after this function has been called.
 */
static void
pop_trash (server)
     popserver server;
{
  if (server->file >= 0)
    {
1563 1564 1565 1566
      /* avoid recursion; sendline can call pop_trash */
      if (server->trash_started)
	return;
      server->trash_started = 1;
1567

Richard M. Stallman's avatar
Richard M. Stallman committed
1568 1569 1570
      sendline (server, "RSET");
      sendline (server, "QUIT");

1571
      CLOSESOCKET (server->file);
Richard M. Stallman's avatar
Richard M. Stallman committed
1572 1573 1574 1575 1576 1577 1578
      server->file = -1;
      if (server->buffer)
	{
	  free (server->buffer);
	  server->buffer = 0;
	}
    }
1579 1580 1581 1582 1583

#ifdef WINDOWSNT
  if (have_winsock)
    WSACleanup ();
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
1584 1585
}

1586 1587 1588
/* Return a pointer to the first CRLF in IN_STRING, which can contain
   embedded nulls and has LEN characters in it not including the final
   null, or 0 if it does not contain one.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
1589 1590

static char *
1591
find_crlf (in_string, len)
1592
     char *in_string;
</