pop.c 37.8 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 4

Copyright (C) 1991, 1993, 1996-1997, 1999, 2001-2011
  Free Software Foundation, Inc.
5 6

Author: Jonathan Kamens <jik@security.ov.com>
Richard M. Stallman's avatar
Richard M. Stallman committed
7 8 9

This file is part of GNU Emacs.

10
GNU Emacs is free software: you can redistribute it and/or modify
Richard M. Stallman's avatar
Richard M. Stallman committed
11
it under the terms of the GNU General Public License as published by
12 13
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Richard M. Stallman's avatar
Richard M. Stallman committed
14 15 16 17 18 19 20

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
21 22
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

Richard M. Stallman's avatar
Richard M. Stallman committed
23

24
#ifdef HAVE_CONFIG_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
#endif
#include <unistd.h>
72

Richard M. Stallman's avatar
Richard M. Stallman committed
73
#ifdef KERBEROS
74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90
# 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
91
#endif /* KERBEROS */
Richard M. Stallman's avatar
Richard M. Stallman committed
92

93
#ifdef KERBEROS
94
#ifndef KERBEROS5
Richard M. Stallman's avatar
Richard M. Stallman committed
95
extern int krb_sendauth (/* long, int, KTEXT, char *, char *, char *,
96 97 98
			    u_long, MSG_DAT *, CREDENTIALS *, Key_schedule,
			    struct sockaddr_in *, struct sockaddr_in *,
			    char * */);
Richard M. Stallman's avatar
Richard M. Stallman committed
99
extern char *krb_realmofhost (/* char * */);
100
#endif /* ! KERBEROS5 */
101
#endif /* KERBEROS */
Richard M. Stallman's avatar
Richard M. Stallman committed
102

103
#ifndef WINDOWSNT
104
#if !defined(HAVE_H_ERRNO) || !defined(HAVE_CONFIG_H)
Richard M. Stallman's avatar
Richard M. Stallman committed
105 106
extern int h_errno;
#endif
107
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
108

109 110
static int socket_connection (char *, int);
static int pop_getline (popserver, char **);
111
static int sendline (popserver, const char *);
112 113
static int fullwrite (int, char *, int);
static int getok (popserver);
Richard M. Stallman's avatar
Richard M. Stallman committed
114
#if 0
115
static int gettermination (popserver);
Richard M. Stallman's avatar
Richard M. Stallman committed
116
#endif
117 118
static void pop_trash (popserver);
static char *find_crlf (char *, int);
119

Dave Love's avatar
Dave Love committed
120
#define ERROR_MAX 160		/* a pretty arbitrary size, but needs
Dave Love's avatar
comment  
Dave Love committed
121 122
				   to be bigger than the original
				   value of 80 */
Richard M. Stallman's avatar
Richard M. Stallman committed
123
#define POP_PORT 110
124
#define POP_SERVICE "pop3"	/* we don't want the POP2 port! */
Richard M. Stallman's avatar
Richard M. Stallman committed
125
#ifdef KERBEROS
126
#define KPOP_PORT 1109
127
#define KPOP_SERVICE "kpop"	/* never used: look for 20060515 to see why */
Richard M. Stallman's avatar
Richard M. Stallman committed
128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166
#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
167
pop_open (char *host, char *username, char *password, int flags)
Richard M. Stallman's avatar
Richard M. Stallman committed
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
{
  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
234 235
#ifdef KERBEROS
#define DONT_NEED_PASSWORD (! (flags & POP_NO_KERBEROS))
Richard M. Stallman's avatar
Richard M. Stallman committed
236
#else
Richard M. Stallman's avatar
Richard M. Stallman committed
237
#define DONT_NEED_PASSWORD 0
Richard M. Stallman's avatar
Richard M. Stallman committed
238
#endif
239

Richard M. Stallman's avatar
Richard M. Stallman committed
240 241 242 243 244 245 246 247 248 249 250 251
  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);
	}
    }
252
  if (password)			/* always true, detected 20060515 */
Richard M. Stallman's avatar
Richard M. Stallman committed
253
    flags |= POP_NO_KERBEROS;
Richard M. Stallman's avatar
Richard M. Stallman committed
254
  else
255 256
    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
257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274

  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
275

Richard M. Stallman's avatar
Richard M. Stallman committed
276 277 278 279 280
  server->file = sock;
  server->data = 0;
  server->buffer_index = 0;
  server->buffer_size = GETLINE_MIN;
  server->in_multi = 0;
281
  server->trash_started = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333

  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
334
pop_stat (popserver server, int *count, int *size)
Richard M. Stallman's avatar
Richard M. Stallman committed
335 336
{
  char *fromserver;
337
  char *end_ptr;
Richard M. Stallman's avatar
Richard M. Stallman committed
338 339 340 341 342 343

  if (server->in_multi)
    {
      strcpy (pop_error, "In multi-line query in pop_stat");
      return (-1);
    }
Pavel Janík's avatar
Pavel Janík committed
344

345
  if (sendline (server, "STAT") || (pop_getline (server, &fromserver) < 0))
Richard M. Stallman's avatar
Richard M. Stallman committed
346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362
    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);
    }

363 364 365
  errno = 0;
  *count = strtol (&fromserver[4], &end_ptr, 10);
  /* Check validity of string-to-integer conversion. */
366
  if (fromserver + 4 == end_ptr || *end_ptr != ' ' || errno)
367 368 369 370 371
    {
      strcpy (pop_error, "Unexpected response from POP server in pop_stat");
      pop_trash (server);
      return (-1);
    }
Pavel Janík's avatar
Pavel Janík committed
372

373
  fromserver = end_ptr;
Richard M. Stallman's avatar
Richard M. Stallman committed
374

375 376
  errno = 0;
  *size = strtol (fromserver + 1, &end_ptr, 10);
377
  if (fromserver + 1 == end_ptr || errno)
378 379 380 381 382
    {
      strcpy (pop_error, "Unexpected response from POP server in pop_stat");
      pop_trash (server);
      return (-1);
    }
Richard M. Stallman's avatar
Richard M. Stallman committed
383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406

  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
407
pop_list (popserver server, int message, int **IDs, int **sizes)
Richard M. Stallman's avatar
Richard M. Stallman committed
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
{
  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);
	}
445
      if (pop_getline (server, &fromserver) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465
	{
	  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]);
466
      fromserver = strchr (&fromserver[4], ' ');
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
      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++)
	{
490
	  if (pop_multi_next (server, &fromserver) <= 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
491 492 493 494 495 496
	    {
	      free ((char *) *IDs);
	      free ((char *) *sizes);
	      return (-1);
	    }
	  (*IDs)[i] = atoi (fromserver);
497
	  fromserver = strchr (fromserver, ' ');
Richard M. Stallman's avatar
Richard M. Stallman committed
498 499 500 501 502 503 504 505 506 507 508
	  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);
	}
509
      if (pop_multi_next (server, &fromserver) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538
	{
	  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 '>'.
539 540
 *	msg_buf	Output parameter to which a buffer containing the
 * 		message is assigned.
541
 *
542 543 544
 * 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
545 546 547
 *
 * Side effects: May kill connection on error.
 */
548
int
549
pop_retrieve (popserver server, int message, int markfrom, char **msg_buf)
Richard M. Stallman's avatar
Richard M. Stallman committed
550 551 552 553 554 555 556 557
{
  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");
558
      return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
559 560 561
    }

  if (pop_list (server, message, &IDs, &sizes))
562
    return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
563 564 565

  if (pop_retrieve_first (server, message, &fromserver))
    {
566
      return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
567 568 569 570 571 572 573 574 575
    }

  /*
   * 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);
576
  ptr = (char *)malloc (bufsize);
Richard M. Stallman's avatar
Richard M. Stallman committed
577 578 579 580 581 582 583
  free ((char *) IDs);
  free ((char *) sizes);

  if (! ptr)
    {
      strcpy (pop_error, "Out of memory in pop_retrieve");
      pop_retrieve_flush (server);
584
      return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
585 586
    }

587
  while ((ret = pop_retrieve_next (server, &fromserver)) >= 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
588 589 590 591
    {
      if (! fromserver)
	{
	  ptr[cp] = '\0';
592 593
	  *msg_buf = ptr;
	  return (cp);
Richard M. Stallman's avatar
Richard M. Stallman committed
594 595 596 597 598 599 600 601
	}
      if (markfrom && fromserver[0] == 'F' && fromserver[1] == 'r' &&
	  fromserver[2] == 'o' && fromserver[3] == 'm' &&
	  fromserver[4] == ' ')
	{
	  if (++fromcount == 5)
	    {
	      bufsize += 5;
602
	      ptr = (char *)realloc (ptr, bufsize);
Richard M. Stallman's avatar
Richard M. Stallman committed
603 604 605 606
	      if (! ptr)
		{
		  strcpy (pop_error, "Out of memory in pop_retrieve");
		  pop_retrieve_flush (server);
607
		  return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
608 609 610 611 612
		}
	      fromcount = 0;
	    }
	  ptr[cp++] = '>';
	}
613
      memcpy (&ptr[cp], fromserver, ret);
614
      cp += ret;
Richard M. Stallman's avatar
Richard M. Stallman committed
615 616 617
      ptr[cp++] = '\n';
    }

618 619
  free (ptr);
  return (-1);
620
}
Richard M. Stallman's avatar
Richard M. Stallman committed
621 622

int
623
pop_retrieve_first (popserver server, int message, char **response)
Richard M. Stallman's avatar
Richard M. Stallman committed
624 625 626 627 628
{
  sprintf (pop_error, "RETR %d", message);
  return (pop_multi_first (server, pop_error, response));
}

629 630 631 632 633 634 635 636
/*
  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
637
int
638
pop_retrieve_next (popserver server, char **line)
Richard M. Stallman's avatar
Richard M. Stallman committed
639 640 641 642 643
{
  return (pop_multi_next (server, line));
}

int
644
pop_retrieve_flush (popserver server)
Richard M. Stallman's avatar
Richard M. Stallman committed
645 646 647 648 649
{
  return (pop_multi_flush (server));
}

int
650
pop_top_first (popserver server, int message, int lines, char **response)
Richard M. Stallman's avatar
Richard M. Stallman committed
651 652 653 654 655
{
  sprintf (pop_error, "TOP %d %d", message, lines);
  return (pop_multi_first (server, pop_error, response));
}

656 657 658 659 660 661 662 663
/*
  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
664
int
665
pop_top_next (popserver server, char **line)
Richard M. Stallman's avatar
Richard M. Stallman committed
666 667 668 669 670
{
  return (pop_multi_next (server, line));
}

int
671
pop_top_flush (popserver server)
Richard M. Stallman's avatar
Richard M. Stallman committed
672 673 674 675 676
{
  return (pop_multi_flush (server));
}

int
677
pop_multi_first (popserver server, const char *command, char **response)
Richard M. Stallman's avatar
Richard M. Stallman committed
678 679 680 681 682 683 684 685
{
  if (server->in_multi)
    {
      strcpy (pop_error,
	      "Already in multi-line query in pop_multi_first");
      return (-1);
    }

686
  if (sendline (server, command) || (pop_getline (server, response) < 0))
Richard M. Stallman's avatar
Richard M. Stallman committed
687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709
    {
      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);
    }
}

710 711 712 713 714 715 716 717 718
/*
  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
719
int
720
pop_multi_next (popserver server, char **line)
Richard M. Stallman's avatar
Richard M. Stallman committed
721 722
{
  char *fromserver;
723
  int ret;
Richard M. Stallman's avatar
Richard M. Stallman committed
724 725 726 727 728 729 730

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

731
  if ((ret = pop_getline (server, &fromserver)) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
732 733 734 735 736 737 738 739 740 741 742 743 744 745 746
    {
      return (-1);
    }

  if (fromserver[0] == '.')
    {
      if (! fromserver[1])
	{
	  *line = 0;
	  server->in_multi = 0;
	  return (0);
	}
      else
	{
	  *line = fromserver + 1;
747
	  return (ret - 1);
Richard M. Stallman's avatar
Richard M. Stallman committed
748 749 750 751 752
	}
    }
  else
    {
      *line = fromserver;
753
      return (ret);
Richard M. Stallman's avatar
Richard M. Stallman committed
754 755 756 757
    }
}

int
758
pop_multi_flush (popserver server)
Richard M. Stallman's avatar
Richard M. Stallman committed
759 760
{
  char *line;
761
  int ret;
Richard M. Stallman's avatar
Richard M. Stallman committed
762 763 764 765 766 767

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

768
  while ((ret = pop_multi_next (server, &line)))
Richard M. Stallman's avatar
Richard M. Stallman committed
769
    {
770 771
      if (ret < 0)
	return (-1);
Richard M. Stallman's avatar
Richard M. Stallman committed
772 773
    }

774
  return (0);
Richard M. Stallman's avatar
Richard M. Stallman committed
775 776 777 778 779 780 781 782 783 784 785 786 787 788
}

/* 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
789
pop_delete (popserver server, int message)
Richard M. Stallman's avatar
Richard M. Stallman committed
790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818
{
  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
819
pop_noop (popserver server)
Richard M. Stallman's avatar
Richard M. Stallman committed
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
{
  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
848
pop_last (popserver server)
Richard M. Stallman's avatar
Richard M. Stallman committed
849 850
{
  char *fromserver;
Pavel Janík's avatar
Pavel Janík committed
851

Richard M. Stallman's avatar
Richard M. Stallman committed
852 853 854 855 856 857 858 859 860
  if (server->in_multi)
    {
      strcpy (pop_error, "In multi-line query in pop_last");
      return (-1);
    }

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

861
  if (pop_getline (server, &fromserver) < 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
    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
    {
877 878 879 880
      char *end_ptr;
      int count;
      errno = 0;
      count = strtol (&fromserver[4], &end_ptr, 10);
881
      if (fromserver + 4 == end_ptr || errno)
882 883 884 885 886 887
	{
	  strcpy (pop_error, "Unexpected response from server in pop_last");
	  pop_trash (server);
	  return (-1);
	}
      return count;
Richard M. Stallman's avatar
Richard M. Stallman committed
888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904
    }
}

/*
 * 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
905
pop_reset (popserver server)
Richard M. Stallman's avatar
Richard M. Stallman committed
906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
{
  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
929
 * Side Effects: The popserver passed in is unusable after this
Richard M. Stallman's avatar
Richard M. Stallman committed
930 931 932
 * 	function is called, even if an error occurs.
 */
int
933
pop_quit (popserver server)
Richard M. Stallman's avatar
Richard M. Stallman committed
934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
{
  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);
    }

952
  free (server->buffer);
Richard M. Stallman's avatar
Richard M. Stallman committed
953 954 955 956 957
  free ((char *) server);

  return (ret);
}

958 959 960 961
#ifdef WINDOWSNT
static int have_winsock = 0;
#endif

Richard M. Stallman's avatar
Richard M. Stallman committed
962 963 964 965 966 967 968 969 970
/*
 * 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
971
 *
Richard M. Stallman's avatar
Richard M. Stallman committed
972 973 974 975 976
 * 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
977
socket_connection (char *host, int flags)
Richard M. Stallman's avatar
Richard M. Stallman committed
978
{
979 980 981 982 983
#ifdef HAVE_GETADDRINFO
  struct addrinfo *res, *it;
  struct addrinfo hints;
  int ret;
#else /* !HAVE_GETADDRINFO */
Richard M. Stallman's avatar
Richard M. Stallman committed
984
  struct hostent *hostent;
985
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
986 987 988
  struct servent *servent;
  struct sockaddr_in addr;
  char found_port = 0;
989
  const char *service;
Richard M. Stallman's avatar
Richard M. Stallman committed
990
  int sock;
991
  char *realhost;
Richard M. Stallman's avatar
Richard M. Stallman committed
992
#ifdef KERBEROS
993
#ifdef KERBEROS5
Richard M. Stallman's avatar
Richard M. Stallman committed
994
  krb5_error_code rem;
995 996
  krb5_context kcontext = 0;
  krb5_auth_context auth_context = 0;
Richard M. Stallman's avatar
Richard M. Stallman committed
997 998 999 1000 1001 1002 1003 1004 1005 1006
  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;
1007
#endif /* KERBEROS5 */
Richard M. Stallman's avatar
Richard M. Stallman committed
1008 1009 1010
#endif /* KERBEROS */

  int try_count = 0;
1011
  int connect_ok;
Richard M. Stallman's avatar
Richard M. Stallman committed
1012

1013 1014 1015 1016 1017 1018 1019 1020
#ifdef WINDOWSNT
  {
    WSADATA winsockData;
    if (WSAStartup (0x101, &winsockData) == 0)
      have_winsock = 1;
  }
#endif

1021
  memset (&addr, 0, sizeof (addr));
Richard M. Stallman's avatar
Richard M. Stallman committed
1022 1023
  addr.sin_family = AF_INET;

1024
  /** "kpop" service is  never used: look for 20060515 to see why **/
Richard M. Stallman's avatar
Richard M. Stallman committed
1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050
#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
	{
1051
  /** "kpop" service is  never used: look for 20060515 to see why **/
Richard M. Stallman's avatar
Richard M. Stallman committed
1052 1053 1054 1055 1056 1057 1058 1059 1060
#ifdef KERBEROS
	  addr.sin_port = htons ((flags & POP_NO_KERBEROS) ?
				POP_PORT : KPOP_PORT);
#else
	  addr.sin_port = htons (POP_PORT);
#endif
	}
    }

1061
#define POP_SOCKET_ERROR "Could not create socket for POP connection: "
Richard M. Stallman's avatar
Richard M. Stallman committed
1062 1063 1064 1065

  sock = socket (PF_INET, SOCK_STREAM, 0);
  if (sock < 0)
    {
1066
      strcpy (pop_error, POP_SOCKET_ERROR);
Richard M. Stallman's avatar
Richard M. Stallman committed
1067
      strncat (pop_error, strerror (errno),
1068
	       ERROR_MAX - sizeof (POP_SOCKET_ERROR));
Richard M. Stallman's avatar
Richard M. Stallman committed
1069
      return (-1);
Pavel Janík's avatar
Pavel Janík committed
1070

Richard M. Stallman's avatar
Richard M. Stallman committed
1071 1072
    }

1073 1074 1075
#ifdef HAVE_GETADDRINFO
  memset (&hints, 0, sizeof(hints));
  hints.ai_socktype = SOCK_STREAM;
1076
  hints.ai_flags = AI_CANONNAME;
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
  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;
1097
              memcpy (&addr.sin_addr, &in_a->sin_addr, sizeof (addr.sin_addr));
1098 1099 1100 1101 1102 1103
              if (! connect (sock, (struct sockaddr *) &addr, sizeof (addr)))
                break;
            }
          it = it->ai_next;
        }
      connect_ok = it != NULL;
1104 1105 1106 1107 1108
      if (connect_ok)
        {
          realhost = alloca (strlen (it->ai_canonname) + 1);
          strcpy (realhost, it->ai_canonname);
        }
1109 1110 1111
      freeaddrinfo (res);
    }
#else /* !HAVE_GETADDRINFO */
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
  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
1123 1124
  while (*hostent->h_addr_list)
    {
1125
      memcpy (&addr.sin_addr, *hostent->h_addr_list, hostent->h_length);
Richard M. Stallman's avatar
Richard M. Stallman committed
1126 1127 1128 1129
      if (! connect (sock, (struct sockaddr *) &addr, sizeof (addr)))
	break;
      hostent->h_addr_list++;
    }
1130
  connect_ok = *hostent->h_addr_list != NULL;
1131 1132 1133 1134 1135 1136
  if (! connect_ok)
    {
      realhost = alloca (strlen (hostent->h_name) + 1);
      strcpy (realhost, hostent->h_name);
    }

1137
#endif /* !HAVE_GETADDRINFO */
Richard M. Stallman's avatar
Richard M. Stallman committed
1138 1139

#define CONNECT_ERROR "Could not connect to POP server: "
Pavel Janík's avatar
Pavel Janík committed
1140

1141
  if (! connect_ok)
Richard M. Stallman's avatar
Richard M. Stallman committed
1142
    {
1143
      CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1144 1145 1146 1147
      strcpy (pop_error, CONNECT_ERROR);
      strncat (pop_error, strerror (errno),
	       ERROR_MAX - sizeof (CONNECT_ERROR));
      return (-1);
Pavel Janík's avatar
Pavel Janík committed
1148

Richard M. Stallman's avatar
Richard M. Stallman committed
1149 1150 1151
    }

#ifdef KERBEROS
1152

Richard M. Stallman's avatar
Richard M. Stallman committed
1153 1154 1155
#define KRB_ERROR "Kerberos error connecting to POP server: "
  if (! (flags & POP_NO_KERBEROS))
    {
1156 1157
#ifdef KERBEROS5
      if ((rem = krb5_init_context (&kcontext)))
Richard M. Stallman's avatar
Richard M. Stallman committed
1158 1159
	{
	krb5error:
1160 1161 1162 1163
	  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
1164 1165 1166
	  strcpy (pop_error, KRB_ERROR);
	  strncat (pop_error, error_message (rem),
		   ERROR_MAX - sizeof(KRB_ERROR));
1167
	  CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1168 1169 1170
	  return (-1);
	}

1171 1172
      if ((rem = krb5_auth_con_init (kcontext, &auth_context)))
	goto krb5error;
Pavel Janík's avatar
Pavel Janík committed
1173

1174 1175 1176 1177 1178
      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
1179

1180
      for (cp = realhost; *cp; cp++)
Richard M. Stallman's avatar
Richard M. Stallman committed
1181 1182 1183 1184 1185 1186 1187
	{
	  if (isupper (*cp))
	    {
	      *cp = tolower (*cp);
	    }
	}

1188
      if (rem = krb5_sname_to_principal (kcontext, realhost,
1189 1190
					 POP_SERVICE, FALSE, &server))
	goto krb5error;
Richard M. Stallman's avatar
Richard M. Stallman committed
1191

1192 1193
      rem = krb5_sendauth (kcontext, &auth_context,
			   (krb5_pointer) &sock, "KPOPV1.0", client, server,
Richard M. Stallman's avatar
Richard M. Stallman committed
1194 1195 1196 1197 1198
			  AP_OPTS_MUTUAL_REQUIRED,
			  0,	/* no checksum */
			  0,	/* no creds, use ccache instead */
			  ccdef,
			  &err_ret,
1199
			  0,	/* don't need subsession key */
Richard M. Stallman's avatar
Richard M. Stallman committed
1200
			  0);	/* don't need reply */
1201
      krb5_free_principal (kcontext, server);
Richard M. Stallman's avatar
Richard M. Stallman committed
1202 1203
      if (rem)
	{
1204 1205 1206 1207
	  strcpy (pop_error, KRB_ERROR);
	  strncat (pop_error, error_message (rem),
		   ERROR_MAX - sizeof (KRB_ERROR));
#if defined HAVE_KRB5_ERROR_TEXT
Richard M. Stallman's avatar
Richard M. Stallman committed
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217
	  if (err_ret && err_ret->text.length)
	    {
	      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);
	    }
1218 1219
#elif defined HAVE_KRB5_ERROR_E_TEXT
	  if (err_ret && err_ret->e_text && strlen(*err_ret->e_text))
Richard M. Stallman's avatar
Richard M. Stallman committed
1220
	    {
1221 1222 1223 1224 1225 1226
	      strncat (pop_error, " [server says '",
		       ERROR_MAX - strlen (pop_error) - 1);
	      strncat (pop_error, *err_ret->e_text,
		       ERROR_MAX - strlen (pop_error) - 1);
	      strncat (pop_error, "']",
		       ERROR_MAX - strlen (pop_error) - 1);
Richard M. Stallman's avatar
Richard M. Stallman committed
1227
	    }
1228
#endif
Richard M. Stallman's avatar
Richard M. Stallman committed
1229
	  if (err_ret)
1230 1231 1232
	    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
1233

1234
	  CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1235 1236
	  return (-1);
	}
Pavel Janík's avatar
Pavel Janík committed
1237
#else  /* ! KERBEROS5 */
Richard M. Stallman's avatar
Richard M. Stallman committed
1238
      ticket = (KTEXT) malloc (sizeof (KTEXT_ST));
1239 1240
      rem = krb_sendauth (0L, sock, ticket, "pop", realhost,
			  (char *) krb_realmofhost (realhost),
Richard M. Stallman's avatar
Richard M. Stallman committed
1241 1242 1243 1244 1245 1246 1247 1248 1249 1250
			  (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));
1251
	  CLOSESOCKET (sock);
Richard M. Stallman's avatar
Richard M. Stallman committed
1252 1253
	  return (-1);
	}
1254
#endif /* KERBEROS5 */
Richard M. Stallman's avatar
Richard M. Stallman committed
1255 1256 1257 1258 1259 1260 1261
    }
#endif /* KERBEROS */

  return (sock);
} /* socket_connection */

/*
1262
 * Function: pop_getline
Richard M. Stallman's avatar
Richard M. Stallman committed
1263 1264 1265 1266 1267 1268 1269 1270 1271
 *
 * 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.
 *
1272 1273 1274 1275 1276
 * 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
1277
 *
1278
 * Notes: The line returned is overwritten with each call to pop_getline.
Richard M. Stallman's avatar
Richard M. Stallman committed
1279 1280
 *
 * Side effects: Closes the connection on error.
1281 1282
 *
 * THE RETURNED LINE MAY CONTAIN EMBEDDED NULLS!
Richard M. Stallman's avatar
Richard M. Stallman committed
1283
 */
1284
static int
1285
pop_getline (popserver server, char **line)
Richard M. Stallman's avatar
Richard M. Stallman committed
1286 1287 1288 1289
{
#define GETLINE_ERROR "Error reading from server: "

  int ret;
1290 1291
  int search_offset = 0;

Richard M. Stallman's avatar
Richard M. Stallman committed
1292 1293
  if (server->data)
    {
1294 1295
      char *cp = find_crlf (server->buffer + server->buffer_index,
			    server->data);
Richard M. Stallman's avatar
Richard M. Stallman committed
1296 1297 1298 1299 1300 1301 1302
      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
1303