pop.c 38.2 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 3
   Copyright (C) 1991, 1993, 1996, 1997, 1999, 2001, 2002, 2003, 2004,
                 2005, 2006, 2007  Free Software Foundation, Inc.
Richard M. Stallman's avatar
Richard M. Stallman committed
4 5 6 7 8 9
   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
10
the Free Software Foundation; either version 3, or (at your option)
Richard M. Stallman's avatar
Richard M. Stallman committed
11 12 13 14 15 16 17 18 19
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
Lute Kamstra's avatar
Lute Kamstra committed
20 21
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */
Richard M. Stallman's avatar
Richard M. Stallman committed
22

23 24
#ifdef HAVE_CONFIG_H
#define NO_SHORTNAMES	/* Tell config not to load remap.h */
Pavel Janík's avatar
Pavel Janík committed
25
#include <config.h>
26 27 28
#else
#define MAIL_USE_POP
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
29

30 31
#ifdef MAIL_USE_POP

Richard M. Stallman's avatar
Richard M. Stallman committed
32
#include <sys/types.h>
33 34 35 36
#ifdef WINDOWSNT
#include "ntlib.h"
#include <winsock.h>
#undef SOCKET_ERROR
37 38 39
#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)
40
#else
Richard M. Stallman's avatar
Richard M. Stallman committed
41 42
#include <netinet/in.h>
#include <sys/socket.h>
43 44 45
#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)
46
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
47
#include <pop.h>
48

Richard M. Stallman's avatar
Richard M. Stallman committed
49 50
#ifdef sun
#include <malloc.h>
51
#endif /* sun */
52

Richard M. Stallman's avatar
Richard M. Stallman committed
53 54 55 56 57 58 59 60 61 62
#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
63

Richard M. Stallman's avatar
Richard M. Stallman committed
64 65 66 67
#include <pwd.h>
#include <netdb.h>
#include <errno.h>
#include <stdio.h>
68 69
#ifdef STDC_HEADERS
#include <string.h>
70 71 72 73
#define index strchr
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
74
#endif
75

Richard M. Stallman's avatar
Richard M. Stallman committed
76
#ifdef KERBEROS
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93
# ifdef HAVE_KRB5_H
#  include <krb5.h>
# 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
94
#endif /* KERBEROS */
Richard M. Stallman's avatar
Richard M. Stallman committed
95

96
#ifdef KERBEROS
97
#ifndef KERBEROS5
Richard M. Stallman's avatar
Richard M. Stallman committed
98
extern int krb_sendauth (/* long, int, KTEXT, char *, char *, char *,
99 100 101
			    u_long, MSG_DAT *, CREDENTIALS *, Key_schedule,
			    struct sockaddr_in *, struct sockaddr_in *,
			    char * */);
Richard M. Stallman's avatar
Richard M. Stallman committed
102
extern char *krb_realmofhost (/* char * */);
103
#endif /* ! KERBEROS5 */
104
#endif /* KERBEROS */
Richard M. Stallman's avatar
Richard M. Stallman committed
105

106
#ifndef WINDOWSNT
107
#if !defined(HAVE_H_ERRNO) || !defined(HAVE_CONFIG_H)
Richard M. Stallman's avatar
Richard M. Stallman committed
108 109
extern int h_errno;
#endif
110
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
111

112
#ifndef __P
113
# ifdef __STDC__
114
#  define __P(a) a
115
# else
116
#  define __P(a) ()
117 118 119
# endif /* __STDC__ */
#endif /* ! __P */

120 121 122 123 124
static int socket_connection __P((char *, int));
static int pop_getline __P((popserver, char **));
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
125
#if 0
126
static int gettermination __P((popserver));
Richard M. Stallman's avatar
Richard M. Stallman committed
127
#endif
128 129
static void pop_trash __P((popserver));
static char *find_crlf __P((char *, int));
130

Dave Love's avatar
Dave Love committed
131
#define ERROR_MAX 160		/* a pretty arbitrary size, but needs
Dave Love's avatar
comment  
Dave Love committed
132 133
				   to be bigger than the original
				   value of 80 */
Richard M. Stallman's avatar
Richard M. Stallman committed
134 135
#define POP_PORT 110
#define KPOP_PORT 1109
136
#define POP_SERVICE "pop3"	/* we don't want the POP2 port! */
Richard M. Stallman's avatar
Richard M. Stallman committed
137
#ifdef KERBEROS
138
#define KPOP_SERVICE "kpop"	/* never used: look for 20060515 to see why */
Richard M. Stallman's avatar
Richard M. Stallman committed
139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248
#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
249 250
#ifdef KERBEROS
#define DONT_NEED_PASSWORD (! (flags & POP_NO_KERBEROS))
Richard M. Stallman's avatar
Richard M. Stallman committed
251
#else
Richard M. Stallman's avatar
Richard M. Stallman committed
252
#define DONT_NEED_PASSWORD 0
Richard M. Stallman's avatar
Richard M. Stallman committed
253
#endif
254

Richard M. Stallman's avatar
Richard M. Stallman committed
255 256 257 258 259 260 261 262 263 264 265 266
  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);
	}
    }
267
  if (password)			/* always true, detected 20060515 */
Richard M. Stallman's avatar
Richard M. Stallman committed
268
    flags |= POP_NO_KERBEROS;
Richard M. Stallman's avatar
Richard M. Stallman committed
269
  else
270 271
    password = username;	/* dead code, detected 20060515 */
  /** "kpop" service is  never used: look for 20060515 to see why **/
Richard M. Stallman's avatar
Richard M. Stallman committed
272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289

  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);
    }
Pavel Janík's avatar
Pavel Janík committed
290

Richard M. Stallman's avatar
Richard M. Stallman committed
291 292 293 294 295
  server->file = sock;
  server->data = 0;
  server->buffer_index = 0;
  server->buffer_size = GETLINE_MIN;
  server->in_multi = 0;
296
  server->trash_started = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360

  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);
    }
Pavel Janík's avatar
Pavel Janík committed
361

362
  if (sendline (server, "STAT") || (pop_getline (server, &fromserver) < 0))
Richard M. Stallman's avatar
Richard M. Stallman committed
363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380
    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]);
Pavel Janík's avatar
Pavel Janík committed
381

Richard M. Stallman's avatar
Richard M. Stallman committed
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
  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);
	}
458
      if (pop_getline (server, &fromserver) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502
	{
	  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++)
	{
503
	  if (pop_multi_next (server, &fromserver) <= 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521
	    {
	      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);
	}
522
      if (pop_multi_next (server, &fromserver) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551
	{
	  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 '>'.
552 553
 *	msg_buf	Output parameter to which a buffer containing the
 * 		message is assigned.
554
 *
555 556 557
 * 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
558 559 560
 *
 * Side effects: May kill connection on error.
 */
561 562
int
pop_retrieve (server, message, markfrom, msg_buf)
Richard M. Stallman's avatar
Richard M. Stallman committed
563 564 565
     popserver server;
     int message;
     int markfrom;
566
     char **msg_buf;
Richard M. Stallman's avatar
Richard M. Stallman committed
567 568 569 570 571 572 573 574
{
  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");
575
      return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
576 577 578
    }

  if (pop_list (server, message, &IDs, &sizes))
579
    return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
580 581 582

  if (pop_retrieve_first (server, message, &fromserver))
    {
583
      return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
584 585 586 587 588 589 590 591 592
    }

  /*
   * 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);
593
  ptr = (char *)malloc (bufsize);
Richard M. Stallman's avatar
Richard M. Stallman committed
594 595 596 597 598 599 600
  free ((char *) IDs);
  free ((char *) sizes);

  if (! ptr)
    {
      strcpy (pop_error, "Out of memory in pop_retrieve");
      pop_retrieve_flush (server);
601
      return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
602 603
    }

604
  while ((ret = pop_retrieve_next (server, &fromserver)) >= 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
605 606 607 608
    {
      if (! fromserver)
	{
	  ptr[cp] = '\0';
609 610
	  *msg_buf = ptr;
	  return (cp);
Richard M. Stallman's avatar
Richard M. Stallman committed
611 612 613 614 615 616 617 618
	}
      if (markfrom && fromserver[0] == 'F' && fromserver[1] == 'r' &&
	  fromserver[2] == 'o' && fromserver[3] == 'm' &&
	  fromserver[4] == ' ')
	{
	  if (++fromcount == 5)
	    {
	      bufsize += 5;
619
	      ptr = (char *)realloc (ptr, bufsize);
Richard M. Stallman's avatar
Richard M. Stallman committed
620 621 622 623
	      if (! ptr)
		{
		  strcpy (pop_error, "Out of memory in pop_retrieve");
		  pop_retrieve_flush (server);
624
		  return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
625 626 627 628 629
		}
	      fromcount = 0;
	    }
	  ptr[cp++] = '>';
	}
630 631
      bcopy (fromserver, &ptr[cp], ret);
      cp += ret;
Richard M. Stallman's avatar
Richard M. Stallman committed
632 633 634
      ptr[cp++] = '\n';
    }

635 636
  free (ptr);
  return (-1);
637
}
Richard M. Stallman's avatar
Richard M. Stallman committed
638 639 640 641 642 643 644 645 646 647 648

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));
}

649 650 651 652 653 654 655 656
/*
  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
657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681
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));
}

682 683 684 685 686 687 688 689
/*
  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
690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717
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);
    }

718
  if (sendline (server, command) || (pop_getline (server, response) < 0))
Richard M. Stallman's avatar
Richard M. Stallman committed
719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741
    {
      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);
    }
}

742 743 744 745 746 747 748 749 750
/*
  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
751 752 753 754 755 756
int
pop_multi_next (server, line)
     popserver server;
     char **line;
{
  char *fromserver;
757
  int ret;
Richard M. Stallman's avatar
Richard M. Stallman committed
758 759 760 761 762 763 764

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

765
  if ((ret = pop_getline (server, &fromserver)) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
766 767 768 769 770 771 772 773 774 775 776 777 778 779 780
    {
      return (-1);
    }

  if (fromserver[0] == '.')
    {
      if (! fromserver[1])
	{
	  *line = 0;
	  server->in_multi = 0;
	  return (0);
	}
      else
	{
	  *line = fromserver + 1;
781
	  return (ret - 1);
Richard M. Stallman's avatar
Richard M. Stallman committed
782 783 784 785 786
	}
    }
  else
    {
      *line = fromserver;
787
      return (ret);
Richard M. Stallman's avatar
Richard M. Stallman committed
788 789 790 791 792 793 794 795
    }
}

int
pop_multi_flush (server)
     popserver server;
{
  char *line;
796
  int ret;
Richard M. Stallman's avatar
Richard M. Stallman committed
797 798 799 800 801 802

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

803
  while ((ret = pop_multi_next (server, &line)))
Richard M. Stallman's avatar
Richard M. Stallman committed
804
    {
805 806
      if (ret < 0)
	return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
807 808
    }

809
  return (0);
Richard M. Stallman's avatar
Richard M. Stallman committed
810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
}

/* 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;
Pavel Janík's avatar
Pavel Janík committed
890

Richard M. Stallman's avatar
Richard M. Stallman committed
891 892 893 894 895 896 897 898 899
  if (server->in_multi)
    {
      strcpy (pop_error, "In multi-line query in pop_last");
      return (-1);
    }

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

900
  if (pop_getline (server, &fromserver) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958
    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
959
 * Side Effects: The popserver passed in is unusable after this
Richard M. Stallman's avatar
Richard M. Stallman committed
960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989
 * 	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);
}

990 991 992 993
#ifdef WINDOWSNT
static int have_winsock = 0;
#endif

Richard M. Stallman's avatar
Richard M. Stallman committed
994 995 996 997 998 999 1000 1001 1002
/*
 * 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.
Pavel Janík's avatar
Pavel Janík committed
1003
 *
Richard M. Stallman's avatar
Richard M. Stallman committed
1004 1005 1006 1007 1008 1009 1010 1011 1012
 * 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;
{
1013 1014 1015 1016 1017
#ifdef HAVE_GETADDRINFO
  struct addrinfo *res, *it;
  struct addrinfo hints;
  int ret;
#else /* !HAVE_GETADDRINFO */
Richard M. Stallman's avatar
Richard M. Stallman committed
1018
  struct hostent *hostent;
1019
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
1020 1021 1022 1023 1024
  struct servent *servent;
  struct sockaddr_in addr;
  char found_port = 0;
  char *service;
  int sock;
1025
  char *realhost;
Richard M. Stallman's avatar
Richard M. Stallman committed
1026
#ifdef KERBEROS
1027
#ifdef KERBEROS5
Richard M. Stallman's avatar
Richard M. Stallman committed
1028
  krb5_error_code rem;
1029 1030
  krb5_context kcontext = 0;
  krb5_auth_context auth_context = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
  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;
1041
#endif /* KERBEROS5 */
Richard M. Stallman's avatar
Richard M. Stallman committed
1042 1043 1044
#endif /* KERBEROS */

  int try_count = 0;
1045
  int connect_ok;
Richard M. Stallman's avatar
Richard M. Stallman committed
1046

1047 1048 1049 1050 1051 1052 1053 1054
#ifdef WINDOWSNT
  {
    WSADATA winsockData;
    if (WSAStartup (0x101, &winsockData) == 0)
      have_winsock = 1;
  }
#endif

Richard M. Stallman's avatar
Richard M. Stallman committed
1055 1056 1057
  bzero ((char *) &addr, sizeof (addr));
  addr.sin_family = AF_INET;

1058
  /** "kpop" service is  never used: look for 20060515 to see why **/
Richard M. Stallman's avatar
Richard M. Stallman committed
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
#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
	{
1085
  /** "kpop" service is  never used: look for 20060515 to see why **/
Richard M. Stallman's avatar
Richard M. Stallman committed
1086 1087 1088 1089 1090 1091 1092 1093 1094
#ifdef KERBEROS
	  addr.sin_port = htons ((flags & POP_NO_KERBEROS) ?
				POP_PORT : KPOP_PORT);
#else
	  addr.sin_port = htons (POP_PORT);
#endif
	}
    }

1095
#define POP_SOCKET_ERROR "Could not create socket for POP connection: "
Richard M. Stallman's avatar
Richard M. Stallman committed
1096 1097 1098 1099

  sock = socket (PF_INET, SOCK_STREAM, 0);
  if (sock < 0)
    {
1100
      strcpy (pop_error, POP_SOCKET_ERROR);
Richard M. Stallman's avatar
Richard M. Stallman committed
1101
      strncat (pop_error, strerror (errno),
1102
	       ERROR_MAX - sizeof (POP_SOCKET_ERROR));
Richard M. Stallman's avatar
Richard M. Stallman committed
1103
      return (-1);
Pavel Janík's avatar
Pavel Janík committed
1104

Richard M. Stallman's avatar
Richard M. Stallman committed
1105 1106
    }

1107 1108 1109
#ifdef HAVE_GETADDRINFO
  memset (&hints, 0, sizeof(hints));
  hints.ai_socktype = SOCK_STREAM;
1110
  hints.ai_flags = AI_ADDRCONFIG | AI_CANONNAME;
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
  hints.ai_family = AF_INET;
  do
    {
      ret = getaddrinfo (host, service, &hints, &res);
      try_count++;
      if (ret != 0 && (ret != EAI_AGAIN || try_count == 5))
	{
	  strcpy (pop_error, "Could not determine POP server's address");
	  return (-1);
	}
    } while (ret != 0);

  if (ret == 0)
    {
      it = res;
      while (it)
        {
          if (it->ai_addrlen == sizeof (addr))
            {
              struct sockaddr_in *in_a = (struct sockaddr_in *) it->ai_addr;
              bcopy (&in_a->sin_addr, (char *) &addr.sin_addr,
                     sizeof (addr.sin_addr));
              if (! connect (sock, (struct sockaddr *) &addr, sizeof (addr)))
                break;
            }
          it = it->ai_next;
        }
      connect_ok = it != NULL;
1139 1140 1141 1142 1143
      if (connect_ok)
        {
          realhost = alloca (strlen (it->ai_canonname) + 1);
          strcpy (realhost, it->ai_canonname);
        }
1144 1145 1146
      freeaddrinfo (res);
    }
#else /* !HAVE_GETADDRINFO */
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
  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);

Richard M. Stallman's avatar
Richard M. Stallman committed
1158 1159 1160 1161 1162 1163 1164 1165
  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++;
    }
1166
  connect_ok = *hostent->h_addr_list != NULL;
1167 1168 1169 1170 1171 1172
  if (! connect_ok)
    {
      realhost = alloca (strlen (hostent->h_name) + 1);
      strcpy (realhost, hostent->h_name);
    }

1173
#endif /* !HAVE_GETADDRINFO */
Richard M. Stallman's avatar
Richard M. Stallman committed
1174 1175

#define CONNECT_ERROR "Could not connect to POP server: "
Pavel Janík's avatar
Pavel Janík committed
1176

1177
  if (! connect_ok)
Richard M. Stallman's avatar
Richard M. Stallman committed
1178
    {
1179
      CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1180 1181 1182 1183
      strcpy (pop_error, CONNECT_ERROR);
      strncat (pop_error, strerror (errno),
	       ERROR_MAX - sizeof (CONNECT_ERROR));
      return (-1);
Pavel Janík's avatar
Pavel Janík committed
1184

Richard M. Stallman's avatar
Richard M. Stallman committed
1185 1186 1187
    }

#ifdef KERBEROS
1188

Richard M. Stallman's avatar
Richard M. Stallman committed
1189 1190 1191
#define KRB_ERROR "Kerberos error connecting to POP server: "
  if (! (flags & POP_NO_KERBEROS))
    {
1192 1193
#ifdef KERBEROS5
      if ((rem = krb5_init_context (&kcontext)))
Richard M. Stallman's avatar
Richard M. Stallman committed
1194 1195
	{
	krb5error:
1196 1197 1198 1199
	  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
1200 1201 1202
	  strcpy (pop_error, KRB_ERROR);
	  strncat (pop_error, error_message (rem),
		   ERROR_MAX - sizeof(KRB_ERROR));
1203
	  CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1204 1205 1206
	  return (-1);
	}

1207 1208
      if ((rem = krb5_auth_con_init (kcontext, &auth_context)))
	goto krb5error;
Pavel Janík's avatar
Pavel Janík committed
1209

1210 1211 1212 1213 1214
      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
1215

1216
      for (cp = realhost; *cp; cp++)
Richard M. Stallman's avatar
Richard M. Stallman committed
1217 1218 1219 1220 1221 1222 1223
	{
	  if (isupper (*cp))
	    {
	      *cp = tolower (*cp);
	    }
	}

1224
      if (rem = krb5_sname_to_principal (kcontext, realhost,
1225 1226
					 POP_SERVICE, FALSE, &server))
	goto krb5error;
Richard M. Stallman's avatar
Richard M. Stallman committed
1227

1228 1229
      rem = krb5_sendauth (kcontext, &auth_context,
			   (krb5_pointer) &sock, "KPOPV1.0", client, server,
Richard M. Stallman's avatar
Richard M. Stallman committed
1230 1231 1232 1233 1234
			  AP_OPTS_MUTUAL_REQUIRED,
			  0,	/* no checksum */
			  0,	/* no creds, use ccache instead */
			  ccdef,
			  &err_ret,
1235
			  0,	/* don't need subsession key */
Richard M. Stallman's avatar
Richard M. Stallman committed
1236
			  0);	/* don't need reply */
1237
      krb5_free_principal (kcontext, server);
Richard M. Stallman's avatar
Richard M. Stallman committed
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
      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)
1260 1261 1262
	    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
1263

1264
	  CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1265 1266
	  return (-1);
	}
Pavel Janík's avatar
Pavel Janík committed
1267
#else  /* ! KERBEROS5 */
Richard M. Stallman's avatar
Richard M. Stallman committed
1268
      ticket = (KTEXT) malloc (sizeof (KTEXT_ST));
1269 1270
      rem = krb_sendauth (0L, sock, ticket, "pop", realhost,
			  (char *) krb_realmofhost (realhost),
Richard M. Stallman's avatar
Richard M. Stallman committed
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280
			  (unsigned long) 0, &msg_data, &cred, schedule,
			  (struct sockaddr_in *) 0,
			  (struct sockaddr_in *) 0,
			  "KPOPV0.1");
      free ((char *) ticket);
      if (rem != KSUCCESS)
	{
	  strcpy (pop_error, KRB_ERROR);
	  strncat (pop_error, krb_err_txt[rem],
		   ERROR_MAX - sizeof (KRB_ERROR));
1281
	  CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1282 1283
	  return (-1);
	}
1284
#endif /* KERBEROS5 */
Richard M. Stallman's avatar
Richard M. Stallman committed
1285 1286 1287 1288 1289 1290 1291
    }
#endif /* KERBEROS */

  return (sock);
} /* socket_connection */

/*
1292
 * Function: pop_getline
Richard M. Stallman's avatar
Richard M. Stallman committed
1293 1294 1295 1296 1297 1298 1299 1300 1301
 *
 * 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.
 *
1302 1303 1304 1305 1306
 * 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
1307
 *
1308
 * Notes: The line returned is overwritten with each call to pop_getline.
Richard M. Stallman's avatar
Richard M. Stallman committed
1309 1310
 *
 * Side effects: Closes the connection on error.
1311 1312
 *
 * THE RETURNED LINE MAY CONTAIN EMBEDDED NULLS!
Richard M. Stallman's avatar
Richard M. Stallman committed
1313
 */
1314
static int
1315
pop_getline (server, line)
Richard M. Stallman's avatar
Richard M. Stallman committed
1316
     popserver server;
1317
     char **line;
Richard M. Stallman's avatar
Richard M. Stallman committed
1318 1319 1320 1321
{
#define GETLINE_ERROR "Error reading from server: "

  int ret;
1322 1323
  int search_offset = 0;

Richard M. Stallman's avatar
Richard M. Stallman committed
1324 1325
  if (server->data)
    {
1326 1327
      char *cp = find_crlf (server->buffer + server->buffer_index,
			    server->data);
Richard M. Stallman's avatar
Richard M. Stallman committed
1328 1329 1330 1331 1332 1333 1334
      if (cp)
	{
	  int found;
	  int data_used;

	  found = server->buffer_index;
	  data_used = (cp + 2) - server->buffer - found;
Pavel Janík's avatar
Pavel Janík committed
1335

Richard M. Stallman's avatar
Richard M. Stallman committed
1336 1337 1338 1339 1340
	  *cp = '\0';		/* terminate the string to be returned */
	  server->data -= data_used;
	  server->buffer_index += data_used;

	  if (pop_debug)
1341 1342
	    /* 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
1343
	    fprintf (stderr, "<<< %s\n", server->buffer + found);
1344 1345
	  *line = server->buffer + found;
	  return (data_used - 2);
Richard M. Stallman's avatar
Richard M. Stallman committed
1346 1347 1348 1349 1350
	}
      else
	{
	  bcopy (server->buffer + server->buffer_index,
		 server->buffer, server->data);
1351 1352 1353 1354 1355 1356 1357 1358
	  /* 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
1359 1360 1361 1362 1363 1364 1365 1366 1367 1368
	  server->buffer_index = 0;
	}
    }
  else
    {
      server->buffer_index = 0;
    }

  while (1)
    {
Richard M. Stallman's avatar
Richard M. Stallman committed
1369 1370 1371 1372
      /* 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
1373
	{
Richard M. Stallman's avatar
Richard M. Stallman committed
1374 1375 1376
	  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
1377
	    {
Richard M. Stallman's avatar
Richard M. Stallman committed
1378 1379 1380
	      strcpy (pop_error, "Out of memory in pop_getline");
	      pop_trash (server);
	      return (-1);
Karl Heuer's avatar
Karl Heuer committed
1381 1382
	    }
	}
Richard M. Stallman's avatar
Richard M. Stallman committed
1383 1384
      ret = RECV (server->file, server->buffer + server->data,
		  server->buffer_size - server->data - 1, 0);
Richard M. Stallman's avatar
Richard M. Stallman committed
1385 1386 1387 1388 1389 1390
      if (ret < 0)
	{
	  strcpy (pop_error, GETLINE_ERROR);
	  strncat (pop_error, strerror (errno),
		   ERROR_MAX - sizeof (GETLINE_ERROR));
	  pop_trash (server);
1391
	  return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
1392 1393 1394
	}
      else if (ret == 0)
	{
1395
	  strcpy (pop_error, "Unexpected EOF from server in pop_getline");
Richard M. Stallman's avatar
Richard M. Stallman committed
1396
	  pop_trash (server);
1397
	  return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
1398 1399 1400
	}
      else
	{
1401
	  char *cp;
Richard M. Stallman's avatar
Richard M. Stallman committed
1402
	  server->data += ret;
1403
	  server->buffer[server->data] = '\0';
Pavel Janík's avatar
Pavel Janík committed
1404

1405 1406
	  cp = find_crlf (server->buffer + search_offset,
			  server->data - search_offset);
Richard M. Stallman's avatar
Richard M. Stallman committed
1407 1408 1409 1410 1411 1412 1413 1414 1415
	  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);
1416 1417
	      *line = server->buffer;
	      return (data_used - 2);
Richard M. Stallman's avatar
Richard M. Stallman committed
1418
	    }
1419 1420 1421
	  /* 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
1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
	}
    }

  /* 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.