mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-17 10:06:13 +00:00
ae1d87e24e
* lib-src/pop.c (socket_connection) [HAVE_GETADDRINFO]: * src/bidi.c (bidi_push_it, bidi_pop_it): * src/fns.c (copy_hash_table): * src/image.c (define_image_type): * src/keyboard.c (kbd_buffer_store_event_hold): * src/process.c (Fprocess_send_eof): * src/xfaces.c (x_create_gc) [HAVE_NS]: * src/xgselect.c (xg_select): Use assignment, not memcpy, as either will do here, and assignment is more likely to catch type errors.
1596 lines
37 KiB
C
1596 lines
37 KiB
C
/* pop.c: client routines for talking to a POP3-protocol post-office server
|
|
|
|
Copyright (C) 1991, 1993, 1996-1997, 1999, 2001-2012
|
|
Free Software Foundation, Inc.
|
|
|
|
Author: Jonathan Kamens <jik@security.ov.com>
|
|
|
|
This file is part of GNU Emacs.
|
|
|
|
GNU Emacs is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
GNU Emacs is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
|
|
#include <config.h>
|
|
|
|
#ifdef MAIL_USE_POP
|
|
|
|
#include <sys/types.h>
|
|
#ifdef WINDOWSNT
|
|
#include "ntlib.h"
|
|
#include <winsock.h>
|
|
#undef SOCKET_ERROR
|
|
#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)
|
|
#else
|
|
#include <netinet/in.h>
|
|
#include <sys/socket.h>
|
|
#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)
|
|
#endif
|
|
#include <pop.h>
|
|
|
|
#ifdef sun
|
|
#include <malloc.h>
|
|
#endif /* sun */
|
|
|
|
#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
|
|
|
|
#include <pwd.h>
|
|
#include <netdb.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#ifdef KERBEROS
|
|
# 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
|
|
#endif /* KERBEROS */
|
|
|
|
#include <min-max.h>
|
|
|
|
#ifdef KERBEROS
|
|
#ifndef KERBEROS5
|
|
extern int krb_sendauth (/* long, int, KTEXT, char *, char *, char *,
|
|
u_long, MSG_DAT *, CREDENTIALS *, Key_schedule,
|
|
struct sockaddr_in *, struct sockaddr_in *,
|
|
char * */);
|
|
extern char *krb_realmofhost (/* char * */);
|
|
#endif /* ! KERBEROS5 */
|
|
#endif /* KERBEROS */
|
|
|
|
#ifndef WINDOWSNT
|
|
#ifndef HAVE_H_ERRNO
|
|
extern int h_errno;
|
|
#endif
|
|
#endif
|
|
|
|
static int socket_connection (char *, int);
|
|
static int pop_getline (popserver, char **);
|
|
static int sendline (popserver, const char *);
|
|
static int fullwrite (int, char *, int);
|
|
static int getok (popserver);
|
|
#if 0
|
|
static int gettermination (popserver);
|
|
#endif
|
|
static void pop_trash (popserver);
|
|
static char *find_crlf (char *, int);
|
|
|
|
#define ERROR_MAX 160 /* a pretty arbitrary size, but needs
|
|
to be bigger than the original
|
|
value of 80 */
|
|
#define POP_PORT 110
|
|
#define POP_SERVICE "pop3" /* we don't want the POP2 port! */
|
|
#ifdef KERBEROS
|
|
#define KPOP_PORT 1109
|
|
#define KPOP_SERVICE "kpop" /* never used: look for 20060515 to see why */
|
|
#endif
|
|
|
|
char pop_error[ERROR_MAX];
|
|
int pop_debug = 0;
|
|
|
|
/*
|
|
* 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 (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 */
|
|
#ifdef KERBEROS
|
|
#define DONT_NEED_PASSWORD (! (flags & POP_NO_KERBEROS))
|
|
#else
|
|
#define DONT_NEED_PASSWORD 0
|
|
#endif
|
|
|
|
if ((! password) && (! DONT_NEED_PASSWORD))
|
|
{
|
|
if (! (flags & POP_NO_GETPASS))
|
|
{
|
|
password = getpass ("Enter POP password:");
|
|
}
|
|
if (! password)
|
|
{
|
|
strcpy (pop_error, "Could not determine POP password");
|
|
return (0);
|
|
}
|
|
}
|
|
if (password) /* always true, detected 20060515 */
|
|
flags |= POP_NO_KERBEROS;
|
|
else
|
|
password = username; /* dead code, detected 20060515 */
|
|
/** "kpop" service is never used: look for 20060515 to see why **/
|
|
|
|
sock = socket_connection (host, flags);
|
|
if (sock == -1)
|
|
return (0);
|
|
|
|
server = (popserver) malloc (sizeof (struct _popserver));
|
|
if (! server)
|
|
{
|
|
strcpy (pop_error, "Out of memory in pop_open");
|
|
return (0);
|
|
}
|
|
server->buffer = (char *) malloc (GETLINE_MIN);
|
|
if (! server->buffer)
|
|
{
|
|
strcpy (pop_error, "Out of memory in pop_open");
|
|
free ((char *) server);
|
|
return (0);
|
|
}
|
|
|
|
server->file = sock;
|
|
server->data = 0;
|
|
server->buffer_index = 0;
|
|
server->buffer_size = GETLINE_MIN;
|
|
server->in_multi = 0;
|
|
server->trash_started = 0;
|
|
|
|
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 (popserver server, int *count, int *size)
|
|
{
|
|
char *fromserver;
|
|
char *end_ptr;
|
|
|
|
if (server->in_multi)
|
|
{
|
|
strcpy (pop_error, "In multi-line query in pop_stat");
|
|
return (-1);
|
|
}
|
|
|
|
if (sendline (server, "STAT") || (pop_getline (server, &fromserver) < 0))
|
|
return (-1);
|
|
|
|
if (strncmp (fromserver, "+OK ", 4))
|
|
{
|
|
if (0 == strncmp (fromserver, "-ERR", 4))
|
|
snprintf (pop_error, ERROR_MAX, "%s", fromserver);
|
|
else
|
|
{
|
|
strcpy (pop_error,
|
|
"Unexpected response from POP server in pop_stat");
|
|
pop_trash (server);
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
errno = 0;
|
|
*count = strtol (&fromserver[4], &end_ptr, 10);
|
|
/* Check validity of string-to-integer conversion. */
|
|
if (fromserver + 4 == end_ptr || *end_ptr != ' ' || errno)
|
|
{
|
|
strcpy (pop_error, "Unexpected response from POP server in pop_stat");
|
|
pop_trash (server);
|
|
return (-1);
|
|
}
|
|
|
|
fromserver = end_ptr;
|
|
|
|
errno = 0;
|
|
*size = strtol (fromserver + 1, &end_ptr, 10);
|
|
if (fromserver + 1 == end_ptr || errno)
|
|
{
|
|
strcpy (pop_error, "Unexpected response from POP server in pop_stat");
|
|
pop_trash (server);
|
|
return (-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 (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);
|
|
}
|
|
if (pop_getline (server, &fromserver) < 0)
|
|
{
|
|
free ((char *) *IDs);
|
|
free ((char *) *sizes);
|
|
return (-1);
|
|
}
|
|
if (strncmp (fromserver, "+OK ", 4))
|
|
{
|
|
if (! strncmp (fromserver, "-ERR", 4))
|
|
snprintf (pop_error, ERROR_MAX, "%s", fromserver);
|
|
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 = strchr (&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++)
|
|
{
|
|
if (pop_multi_next (server, &fromserver) <= 0)
|
|
{
|
|
free ((char *) *IDs);
|
|
free ((char *) *sizes);
|
|
return (-1);
|
|
}
|
|
(*IDs)[i] = atoi (fromserver);
|
|
fromserver = strchr (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);
|
|
}
|
|
if (pop_multi_next (server, &fromserver) < 0)
|
|
{
|
|
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 '>'.
|
|
* msg_buf Output parameter to which a buffer containing the
|
|
* message is assigned.
|
|
*
|
|
* 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.
|
|
*
|
|
* Side effects: May kill connection on error.
|
|
*/
|
|
int
|
|
pop_retrieve (popserver server, int message, int markfrom, char **msg_buf)
|
|
{
|
|
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");
|
|
return (-1);
|
|
}
|
|
|
|
if (pop_list (server, message, &IDs, &sizes))
|
|
return (-1);
|
|
|
|
if (pop_retrieve_first (server, message, &fromserver))
|
|
{
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
ptr = (char *)malloc (bufsize);
|
|
free ((char *) IDs);
|
|
free ((char *) sizes);
|
|
|
|
if (! ptr)
|
|
{
|
|
strcpy (pop_error, "Out of memory in pop_retrieve");
|
|
pop_retrieve_flush (server);
|
|
return (-1);
|
|
}
|
|
|
|
while ((ret = pop_retrieve_next (server, &fromserver)) >= 0)
|
|
{
|
|
if (! fromserver)
|
|
{
|
|
ptr[cp] = '\0';
|
|
*msg_buf = ptr;
|
|
return (cp);
|
|
}
|
|
if (markfrom && fromserver[0] == 'F' && fromserver[1] == 'r' &&
|
|
fromserver[2] == 'o' && fromserver[3] == 'm' &&
|
|
fromserver[4] == ' ')
|
|
{
|
|
if (++fromcount == 5)
|
|
{
|
|
bufsize += 5;
|
|
ptr = (char *)realloc (ptr, bufsize);
|
|
if (! ptr)
|
|
{
|
|
strcpy (pop_error, "Out of memory in pop_retrieve");
|
|
pop_retrieve_flush (server);
|
|
return (-1);
|
|
}
|
|
fromcount = 0;
|
|
}
|
|
ptr[cp++] = '>';
|
|
}
|
|
memcpy (&ptr[cp], fromserver, ret);
|
|
cp += ret;
|
|
ptr[cp++] = '\n';
|
|
}
|
|
|
|
free (ptr);
|
|
return (-1);
|
|
}
|
|
|
|
int
|
|
pop_retrieve_first (popserver server, int message, char **response)
|
|
{
|
|
sprintf (pop_error, "RETR %d", message);
|
|
return (pop_multi_first (server, pop_error, response));
|
|
}
|
|
|
|
/*
|
|
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).
|
|
*/
|
|
|
|
int
|
|
pop_retrieve_next (popserver server, char **line)
|
|
{
|
|
return (pop_multi_next (server, line));
|
|
}
|
|
|
|
int
|
|
pop_retrieve_flush (popserver server)
|
|
{
|
|
return (pop_multi_flush (server));
|
|
}
|
|
|
|
int
|
|
pop_top_first (popserver server, int message, int lines, char **response)
|
|
{
|
|
sprintf (pop_error, "TOP %d %d", message, lines);
|
|
return (pop_multi_first (server, pop_error, response));
|
|
}
|
|
|
|
/*
|
|
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).
|
|
*/
|
|
|
|
int
|
|
pop_top_next (popserver server, char **line)
|
|
{
|
|
return (pop_multi_next (server, line));
|
|
}
|
|
|
|
int
|
|
pop_top_flush (popserver server)
|
|
{
|
|
return (pop_multi_flush (server));
|
|
}
|
|
|
|
int
|
|
pop_multi_first (popserver server, const char *command, char **response)
|
|
{
|
|
if (server->in_multi)
|
|
{
|
|
strcpy (pop_error,
|
|
"Already in multi-line query in pop_multi_first");
|
|
return (-1);
|
|
}
|
|
|
|
if (sendline (server, command) || (pop_getline (server, response) < 0))
|
|
{
|
|
return (-1);
|
|
}
|
|
|
|
if (0 == strncmp (*response, "-ERR", 4))
|
|
{
|
|
snprintf (pop_error, ERROR_MAX, "%s", *response);
|
|
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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
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. */
|
|
|
|
int
|
|
pop_multi_next (popserver server, char **line)
|
|
{
|
|
char *fromserver;
|
|
int ret;
|
|
|
|
if (! server->in_multi)
|
|
{
|
|
strcpy (pop_error, "Not in multi-line query in pop_multi_next");
|
|
return (-1);
|
|
}
|
|
|
|
if ((ret = pop_getline (server, &fromserver)) < 0)
|
|
{
|
|
return (-1);
|
|
}
|
|
|
|
if (fromserver[0] == '.')
|
|
{
|
|
if (! fromserver[1])
|
|
{
|
|
*line = 0;
|
|
server->in_multi = 0;
|
|
return (0);
|
|
}
|
|
else
|
|
{
|
|
*line = fromserver + 1;
|
|
return (ret - 1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
*line = fromserver;
|
|
return (ret);
|
|
}
|
|
}
|
|
|
|
int
|
|
pop_multi_flush (popserver server)
|
|
{
|
|
char *line;
|
|
int ret;
|
|
|
|
if (! server->in_multi)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
while ((ret = pop_multi_next (server, &line)))
|
|
{
|
|
if (ret < 0)
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* 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 (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 (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 (popserver server)
|
|
{
|
|
char *fromserver;
|
|
|
|
if (server->in_multi)
|
|
{
|
|
strcpy (pop_error, "In multi-line query in pop_last");
|
|
return (-1);
|
|
}
|
|
|
|
if (sendline (server, "LAST"))
|
|
return (-1);
|
|
|
|
if (pop_getline (server, &fromserver) < 0)
|
|
return (-1);
|
|
|
|
if (! strncmp (fromserver, "-ERR", 4))
|
|
{
|
|
snprintf (pop_error, ERROR_MAX, "%s", fromserver);
|
|
return (-1);
|
|
}
|
|
else if (strncmp (fromserver, "+OK ", 4))
|
|
{
|
|
strcpy (pop_error, "Unexpected response from server in pop_last");
|
|
pop_trash (server);
|
|
return (-1);
|
|
}
|
|
else
|
|
{
|
|
char *end_ptr;
|
|
int count;
|
|
errno = 0;
|
|
count = strtol (&fromserver[4], &end_ptr, 10);
|
|
if (fromserver + 4 == end_ptr || errno)
|
|
{
|
|
strcpy (pop_error, "Unexpected response from server in pop_last");
|
|
pop_trash (server);
|
|
return (-1);
|
|
}
|
|
return count;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 (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.
|
|
*
|
|
* Side Effects: The popserver passed in is unusable after this
|
|
* function is called, even if an error occurs.
|
|
*/
|
|
int
|
|
pop_quit (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);
|
|
}
|
|
|
|
free (server->buffer);
|
|
free ((char *) server);
|
|
|
|
return (ret);
|
|
}
|
|
|
|
#ifdef WINDOWSNT
|
|
static int have_winsock = 0;
|
|
#endif
|
|
|
|
/*
|
|
* Function: socket_connection
|
|
*
|
|
* Purpose: Opens the network connection with the mail host, without
|
|
* doing any sort of I/O with it or anything.
|
|
*
|
|
* Arguments:
|
|
* host The host to which to connect.
|
|
* flags Option flags.
|
|
*
|
|
* Return value: A file descriptor indicating the connection, or -1
|
|
* indicating failure, in which case an error has been copied
|
|
* into pop_error.
|
|
*/
|
|
static int
|
|
socket_connection (char *host, int flags)
|
|
{
|
|
#ifdef HAVE_GETADDRINFO
|
|
struct addrinfo *res, *it;
|
|
struct addrinfo hints;
|
|
int ret;
|
|
#else /* !HAVE_GETADDRINFO */
|
|
struct hostent *hostent;
|
|
#endif
|
|
struct servent *servent;
|
|
struct sockaddr_in addr;
|
|
char found_port = 0;
|
|
const char *service;
|
|
int sock;
|
|
char *realhost;
|
|
#ifdef KERBEROS
|
|
#ifdef KERBEROS5
|
|
krb5_error_code rem;
|
|
krb5_context kcontext = 0;
|
|
krb5_auth_context auth_context = 0;
|
|
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;
|
|
#endif /* KERBEROS5 */
|
|
#endif /* KERBEROS */
|
|
|
|
int try_count = 0;
|
|
int connect_ok;
|
|
|
|
#ifdef WINDOWSNT
|
|
{
|
|
WSADATA winsockData;
|
|
if (WSAStartup (0x101, &winsockData) == 0)
|
|
have_winsock = 1;
|
|
}
|
|
#endif
|
|
|
|
memset (&addr, 0, sizeof (addr));
|
|
addr.sin_family = AF_INET;
|
|
|
|
/** "kpop" service is never used: look for 20060515 to see why **/
|
|
#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
|
|
{
|
|
/** "kpop" service is never used: look for 20060515 to see why **/
|
|
#ifdef KERBEROS
|
|
addr.sin_port = htons ((flags & POP_NO_KERBEROS) ?
|
|
POP_PORT : KPOP_PORT);
|
|
#else
|
|
addr.sin_port = htons (POP_PORT);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#define POP_SOCKET_ERROR "Could not create socket for POP connection: "
|
|
|
|
sock = socket (PF_INET, SOCK_STREAM, 0);
|
|
if (sock < 0)
|
|
{
|
|
snprintf (pop_error, ERROR_MAX, "%s%s",
|
|
POP_SOCKET_ERROR, strerror (errno));
|
|
return (-1);
|
|
|
|
}
|
|
|
|
#ifdef HAVE_GETADDRINFO
|
|
memset (&hints, 0, sizeof (hints));
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
hints.ai_flags = AI_CANONNAME;
|
|
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;
|
|
addr.sin_addr = in_a->sin_addr;
|
|
if (! connect (sock, (struct sockaddr *) &addr, sizeof (addr)))
|
|
break;
|
|
}
|
|
it = it->ai_next;
|
|
}
|
|
connect_ok = it != NULL;
|
|
if (connect_ok)
|
|
{
|
|
realhost = alloca (strlen (it->ai_canonname) + 1);
|
|
strcpy (realhost, it->ai_canonname);
|
|
}
|
|
freeaddrinfo (res);
|
|
}
|
|
#else /* !HAVE_GETADDRINFO */
|
|
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);
|
|
|
|
while (*hostent->h_addr_list)
|
|
{
|
|
memcpy (&addr.sin_addr, *hostent->h_addr_list, hostent->h_length);
|
|
if (! connect (sock, (struct sockaddr *) &addr, sizeof (addr)))
|
|
break;
|
|
hostent->h_addr_list++;
|
|
}
|
|
connect_ok = *hostent->h_addr_list != NULL;
|
|
if (! connect_ok)
|
|
{
|
|
realhost = alloca (strlen (hostent->h_name) + 1);
|
|
strcpy (realhost, hostent->h_name);
|
|
}
|
|
|
|
#endif /* !HAVE_GETADDRINFO */
|
|
|
|
#define CONNECT_ERROR "Could not connect to POP server: "
|
|
|
|
if (! connect_ok)
|
|
{
|
|
CLOSESOCKET (sock);
|
|
snprintf (pop_error, ERROR_MAX, "%s%s", CONNECT_ERROR, strerror (errno));
|
|
return (-1);
|
|
|
|
}
|
|
|
|
#ifdef KERBEROS
|
|
|
|
#define KRB_ERROR "Kerberos error connecting to POP server: "
|
|
if (! (flags & POP_NO_KERBEROS))
|
|
{
|
|
#ifdef KERBEROS5
|
|
if ((rem = krb5_init_context (&kcontext)))
|
|
{
|
|
krb5error:
|
|
if (auth_context)
|
|
krb5_auth_con_free (kcontext, auth_context);
|
|
if (kcontext)
|
|
krb5_free_context (kcontext);
|
|
snprintf (pop_error, ERROR_MAX, "%s%s",
|
|
KRB_ERROR, error_message (rem));
|
|
CLOSESOCKET (sock);
|
|
return (-1);
|
|
}
|
|
|
|
if ((rem = krb5_auth_con_init (kcontext, &auth_context)))
|
|
goto krb5error;
|
|
|
|
if (rem = krb5_cc_default (kcontext, &ccdef))
|
|
goto krb5error;
|
|
|
|
if (rem = krb5_cc_get_principal (kcontext, ccdef, &client))
|
|
goto krb5error;
|
|
|
|
for (cp = realhost; *cp; cp++)
|
|
{
|
|
if (isupper (*cp))
|
|
{
|
|
*cp = tolower (*cp);
|
|
}
|
|
}
|
|
|
|
if (rem = krb5_sname_to_principal (kcontext, realhost,
|
|
POP_SERVICE, FALSE, &server))
|
|
goto krb5error;
|
|
|
|
rem = krb5_sendauth (kcontext, &auth_context,
|
|
(krb5_pointer) &sock, "KPOPV1.0", client, server,
|
|
AP_OPTS_MUTUAL_REQUIRED,
|
|
0, /* no checksum */
|
|
0, /* no creds, use ccache instead */
|
|
ccdef,
|
|
&err_ret,
|
|
0, /* don't need subsession key */
|
|
0); /* don't need reply */
|
|
krb5_free_principal (kcontext, server);
|
|
if (rem)
|
|
{
|
|
int pop_error_len = snprintf (pop_error, ERROR_MAX, "%s%s",
|
|
KRB_ERROR, error_message (rem));
|
|
#if defined HAVE_KRB5_ERROR_TEXT
|
|
if (err_ret && err_ret->text.length)
|
|
{
|
|
int errlen = err_ret->text.length;
|
|
snprintf (pop_error + pop_error_len, ERROR_MAX - pop_error_len,
|
|
" [server says '.*%s']", errlen, err_ret->text.data);
|
|
}
|
|
#elif defined HAVE_KRB5_ERROR_E_TEXT
|
|
if (err_ret && err_ret->e_text && **err_ret->e_text)
|
|
snprintf (pop_error + pop_error_len, ERRMAX - pop_error_len,
|
|
" [server says '%s']", *err_ret->e_text);
|
|
#endif
|
|
if (err_ret)
|
|
krb5_free_error (kcontext, err_ret);
|
|
krb5_auth_con_free (kcontext, auth_context);
|
|
krb5_free_context (kcontext);
|
|
|
|
CLOSESOCKET (sock);
|
|
return (-1);
|
|
}
|
|
#else /* ! KERBEROS5 */
|
|
ticket = (KTEXT) malloc (sizeof (KTEXT_ST));
|
|
rem = krb_sendauth (0L, sock, ticket, "pop", realhost,
|
|
(char *) krb_realmofhost (realhost),
|
|
(unsigned long) 0, &msg_data, &cred, schedule,
|
|
(struct sockaddr_in *) 0,
|
|
(struct sockaddr_in *) 0,
|
|
"KPOPV0.1");
|
|
free ((char *) ticket);
|
|
if (rem != KSUCCESS)
|
|
{
|
|
snprintf (pop_error, ERROR_MAX, "%s%s", KRB_ERROR, krb_err_txt[rem]);
|
|
CLOSESOCKET (sock);
|
|
return (-1);
|
|
}
|
|
#endif /* KERBEROS5 */
|
|
}
|
|
#endif /* KERBEROS */
|
|
|
|
return (sock);
|
|
} /* socket_connection */
|
|
|
|
/*
|
|
* Function: pop_getline
|
|
*
|
|
* 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.
|
|
*
|
|
* 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.
|
|
*
|
|
* Notes: The line returned is overwritten with each call to pop_getline.
|
|
*
|
|
* Side effects: Closes the connection on error.
|
|
*
|
|
* THE RETURNED LINE MAY CONTAIN EMBEDDED NULLS!
|
|
*/
|
|
static int
|
|
pop_getline (popserver server, char **line)
|
|
{
|
|
#define GETLINE_ERROR "Error reading from server: "
|
|
|
|
int ret;
|
|
int search_offset = 0;
|
|
|
|
if (server->data)
|
|
{
|
|
char *cp = find_crlf (server->buffer + server->buffer_index,
|
|
server->data);
|
|
if (cp)
|
|
{
|
|
int found;
|
|
int data_used;
|
|
|
|
found = server->buffer_index;
|
|
data_used = (cp + 2) - server->buffer - found;
|
|
|
|
*cp = '\0'; /* terminate the string to be returned */
|
|
server->data -= data_used;
|
|
server->buffer_index += data_used;
|
|
|
|
if (pop_debug)
|
|
/* Embedded nulls will truncate this output prematurely,
|
|
but that's OK because it's just for debugging anyway. */
|
|
fprintf (stderr, "<<< %s\n", server->buffer + found);
|
|
*line = server->buffer + found;
|
|
return (data_used - 2);
|
|
}
|
|
else
|
|
{
|
|
memmove (server->buffer, server->buffer + server->buffer_index,
|
|
server->data);
|
|
/* 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;
|
|
server->buffer_index = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
server->buffer_index = 0;
|
|
}
|
|
|
|
while (1)
|
|
{
|
|
/* 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)
|
|
{
|
|
server->buffer_size += GETLINE_INCR;
|
|
server->buffer = (char *)realloc (server->buffer, server->buffer_size);
|
|
if (! server->buffer)
|
|
{
|
|
strcpy (pop_error, "Out of memory in pop_getline");
|
|
pop_trash (server);
|
|
return (-1);
|
|
}
|
|
}
|
|
ret = RECV (server->file, server->buffer + server->data,
|
|
server->buffer_size - server->data - 1, 0);
|
|
if (ret < 0)
|
|
{
|
|
snprintf (pop_error, ERROR_MAX, "%s%s",
|
|
GETLINE_ERROR, strerror (errno));
|
|
pop_trash (server);
|
|
return (-1);
|
|
}
|
|
else if (ret == 0)
|
|
{
|
|
strcpy (pop_error, "Unexpected EOF from server in pop_getline");
|
|
pop_trash (server);
|
|
return (-1);
|
|
}
|
|
else
|
|
{
|
|
char *cp;
|
|
server->data += ret;
|
|
server->buffer[server->data] = '\0';
|
|
|
|
cp = find_crlf (server->buffer + search_offset,
|
|
server->data - search_offset);
|
|
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);
|
|
*line = server->buffer;
|
|
return (data_used - 2);
|
|
}
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Function: sendline
|
|
*
|
|
* Purpose: Sends a line of text to the POP server. The line of text
|
|
* passed into this function should NOT have the carriage return
|
|
* and linefeed on the end of it. Periods at beginnings of lines
|
|
* will NOT be treated specially by this function.
|
|
*
|
|
* Arguments:
|
|
* server The server to which to send the text.
|
|
* line The line of text to send.
|
|
*
|
|
* Return value: Upon successful completion, a value of 0 will be
|
|
* returned. Otherwise, a non-zero value will be returned, and
|
|
* an error will be copied into pop_error.
|
|
*
|
|
* Side effects: Closes the connection on error.
|
|
*/
|
|
static int
|
|
sendline (popserver server, const char *line)
|
|
{
|
|
#define SENDLINE_ERROR "Error writing to POP server: "
|
|
int ret;
|
|
char *buf;
|
|
|
|
/* Combine the string and the CR-LF into one buffer. Otherwise, two
|
|
reasonable network stack optimizations, Nagle's algorithm and
|
|
delayed acks, combine to delay us a fraction of a second on every
|
|
message we send. (Movemail writes line without \r\n, client
|
|
kernel sends packet, server kernel delays the ack to see if it
|
|
can combine it with data, movemail writes \r\n, client kernel
|
|
waits because it has unacked data already in its outgoing queue,
|
|
client kernel eventually times out and sends.)
|
|
|
|
This can be something like 0.2s per command, which can add up
|
|
over a few dozen messages, and is a big chunk of the time we
|
|
spend fetching mail from a server close by. */
|
|
buf = alloca (strlen (line) + 3);
|
|
strcpy (buf, line);
|
|
strcat (buf, "\r\n");
|
|
ret = fullwrite (server->file, buf, strlen (buf));
|
|
|
|
if (ret < 0)
|
|
{
|
|
pop_trash (server);
|
|
snprintf (pop_error, ERROR_MAX, "%s%s", SENDLINE_ERROR, strerror (errno));
|
|
return (ret);
|
|
}
|
|
|
|
if (pop_debug)
|
|
fprintf (stderr, ">>> %s\n", line);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Procedure: fullwrite
|
|
*
|
|
* Purpose: Just like write, but keeps trying until the entire string
|
|
* has been written.
|
|
*
|
|
* Return value: Same as write. Pop_error is not set.
|
|
*/
|
|
static int
|
|
fullwrite (int fd, char *buf, int nbytes)
|
|
{
|
|
char *cp;
|
|
int ret = 0;
|
|
|
|
cp = buf;
|
|
while (nbytes && ((ret = SEND (fd, cp, nbytes, 0)) > 0))
|
|
{
|
|
cp += ret;
|
|
nbytes -= ret;
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Procedure getok
|
|
*
|
|
* Purpose: Reads a line from the server. If the return indicator is
|
|
* positive, return with a zero exit status. If not, return with
|
|
* a negative exit status.
|
|
*
|
|
* Arguments:
|
|
* server The server to read from.
|
|
*
|
|
* Returns: 0 for success, else for failure and puts error in pop_error.
|
|
*
|
|
* Side effects: On failure, may make the connection unusable.
|
|
*/
|
|
static int
|
|
getok (popserver server)
|
|
{
|
|
char *fromline;
|
|
|
|
if (pop_getline (server, &fromline) < 0)
|
|
{
|
|
return (-1);
|
|
}
|
|
|
|
if (! strncmp (fromline, "+OK", 3))
|
|
return (0);
|
|
else if (! strncmp (fromline, "-ERR", 4))
|
|
{
|
|
snprintf (pop_error, ERROR_MAX, "%s", fromline);
|
|
return (-1);
|
|
}
|
|
else
|
|
{
|
|
strcpy (pop_error,
|
|
"Unexpected response from server; expecting +OK or -ERR");
|
|
pop_trash (server);
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* Function: gettermination
|
|
*
|
|
* Purpose: Gets the next line and verifies that it is a termination
|
|
* line (nothing but a dot).
|
|
*
|
|
* Return value: 0 on success, non-zero with pop_error set on error.
|
|
*
|
|
* Side effects: Closes the connection on error.
|
|
*/
|
|
static int
|
|
gettermination (server)
|
|
popserver server;
|
|
{
|
|
char *fromserver;
|
|
|
|
if (pop_getline (server, &fromserver) < 0)
|
|
return (-1);
|
|
|
|
if (strcmp (fromserver, "."))
|
|
{
|
|
strcpy (pop_error,
|
|
"Unexpected response from server in gettermination");
|
|
pop_trash (server);
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Function pop_close
|
|
*
|
|
* Purpose: Close a pop connection, sending a "RSET" command to try to
|
|
* preserve any changes that were made and a "QUIT" command to
|
|
* try to get the server to quit, but ignoring any responses that
|
|
* are received.
|
|
*
|
|
* Side effects: The server is unusable after this function returns.
|
|
* Changes made to the maildrop since the session was started (or
|
|
* since the last pop_reset) may be lost.
|
|
*/
|
|
void
|
|
pop_close (popserver server)
|
|
{
|
|
pop_trash (server);
|
|
free ((char *) server);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Function: pop_trash
|
|
*
|
|
* Purpose: Like pop_close or pop_quit, but doesn't deallocate the
|
|
* memory associated with the server. It is valid to call
|
|
* pop_close or pop_quit after this function has been called.
|
|
*/
|
|
static void
|
|
pop_trash (popserver server)
|
|
{
|
|
if (server->file >= 0)
|
|
{
|
|
/* avoid recursion; sendline can call pop_trash */
|
|
if (server->trash_started)
|
|
return;
|
|
server->trash_started = 1;
|
|
|
|
sendline (server, "RSET");
|
|
sendline (server, "QUIT");
|
|
|
|
CLOSESOCKET (server->file);
|
|
server->file = -1;
|
|
if (server->buffer)
|
|
{
|
|
free (server->buffer);
|
|
server->buffer = 0;
|
|
}
|
|
}
|
|
|
|
#ifdef WINDOWSNT
|
|
if (have_winsock)
|
|
WSACleanup ();
|
|
#endif
|
|
}
|
|
|
|
/* Return a pointer to the first CRLF in IN_STRING, which can contain
|
|
embedded nulls and has LEN characters in it not including the final
|
|
null, or 0 if it does not contain one. */
|
|
|
|
static char *
|
|
find_crlf (char *in_string, int len)
|
|
{
|
|
while (len--)
|
|
{
|
|
if (*in_string == '\r')
|
|
{
|
|
if (*++in_string == '\n')
|
|
return (in_string - 1);
|
|
}
|
|
else
|
|
in_string++;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#endif /* MAIL_USE_POP */
|