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1615 lines
36 KiB
C
1615 lines
36 KiB
C
/* pop.c: client routines for talking to a POP3-protocol post-office server
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Copyright (C) 1991, 1993, 1996, 1997, 1999, 2002, 2003, 2004,
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2005 Free Software Foundation, Inc.
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Written by Jonathan Kamens, jik@security.ov.com.
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This file is part of GNU Emacs.
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GNU Emacs is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#ifdef HAVE_CONFIG_H
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#define NO_SHORTNAMES /* Tell config not to load remap.h */
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#include <config.h>
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#else
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#define MAIL_USE_POP
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#endif
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#ifdef MAIL_USE_POP
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#include <sys/types.h>
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#ifdef WINDOWSNT
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#include "ntlib.h"
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#include <winsock.h>
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#undef SOCKET_ERROR
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#define RECV(s,buf,len,flags) recv(s,buf,len,flags)
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#define SEND(s,buf,len,flags) send(s,buf,len,flags)
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#define CLOSESOCKET(s) closesocket(s)
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#else
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#include <netinet/in.h>
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#include <sys/socket.h>
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#define RECV(s,buf,len,flags) read(s,buf,len)
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#define SEND(s,buf,len,flags) write(s,buf,len)
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#define CLOSESOCKET(s) close(s)
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#endif
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#include <pop.h>
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#ifdef sun
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#include <malloc.h>
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#endif /* sun */
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#ifdef HESIOD
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#include <hesiod.h>
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/*
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* It really shouldn't be necessary to put this declaration here, but
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* the version of hesiod.h that Athena has installed in release 7.2
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* doesn't declare this function; I don't know if the 7.3 version of
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* hesiod.h does.
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*/
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extern struct servent *hes_getservbyname (/* char *, char * */);
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#endif
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#include <pwd.h>
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#include <netdb.h>
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#include <errno.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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#include <string.h>
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#define index strchr
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef KERBEROS
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# ifdef HAVE_KRB5_H
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# include <krb5.h>
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# endif
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# ifdef HAVE_KRB_H
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# include <krb.h>
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# else
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# ifdef HAVE_KERBEROSIV_KRB_H
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# include <kerberosIV/krb.h>
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# else
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# ifdef HAVE_KERBEROS_KRB_H
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# include <kerberos/krb.h>
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# endif
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# endif
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# endif
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# ifdef HAVE_COM_ERR_H
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# include <com_err.h>
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# endif
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#endif /* KERBEROS */
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#ifdef KERBEROS
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#ifndef KERBEROS5
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extern int krb_sendauth (/* long, int, KTEXT, char *, char *, char *,
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u_long, MSG_DAT *, CREDENTIALS *, Key_schedule,
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struct sockaddr_in *, struct sockaddr_in *,
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char * */);
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extern char *krb_realmofhost (/* char * */);
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#endif /* ! KERBEROS5 */
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#endif /* KERBEROS */
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#ifndef WINDOWSNT
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#if !defined(HAVE_H_ERRNO) || !defined(HAVE_CONFIG_H)
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extern int h_errno;
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#endif
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#endif
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#ifndef __P
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# ifdef __STDC__
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# define __P(a) a
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# else
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# define __P(a) ()
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# endif /* __STDC__ */
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#endif /* ! __P */
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static int socket_connection __P((char *, int));
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static int pop_getline __P((popserver, char **));
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static int sendline __P((popserver, char *));
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static int fullwrite __P((int, char *, int));
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static int getok __P((popserver));
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#if 0
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static int gettermination __P((popserver));
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#endif
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static void pop_trash __P((popserver));
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static char *find_crlf __P((char *, int));
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#define ERROR_MAX 160 /* a pretty arbitrary size, but needs
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to be bigger than the original
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value of 80 */
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#define POP_PORT 110
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#define KPOP_PORT 1109
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#define POP_SERVICE "pop3" /* we don't want the POP2 port! */
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#ifdef KERBEROS
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#define KPOP_SERVICE "kpop"
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#endif
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char pop_error[ERROR_MAX];
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int pop_debug = 0;
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#ifndef min
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#define min(a,b) (((a) < (b)) ? (a) : (b))
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#endif
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/*
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* Function: pop_open (char *host, char *username, char *password,
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* int flags)
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*
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* Purpose: Establishes a connection with a post-office server, and
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* completes the authorization portion of the session.
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*
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* Arguments:
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* host The server host with which the connection should be
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* established. Optional. If omitted, internal
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* heuristics will be used to determine the server host,
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* if possible.
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* username
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* The username of the mail-drop to access. Optional.
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* If omitted, internal heuristics will be used to
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* determine the username, if possible.
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* password
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* The password to use for authorization. If omitted,
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* internal heuristics will be used to determine the
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* password, if possible.
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* flags A bit mask containing flags controlling certain
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* functions of the routine. Valid flags are defined in
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* the file pop.h
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*
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* Return value: Upon successful establishment of a connection, a
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* non-null popserver will be returned. Otherwise, null will be
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* returned, and the string variable pop_error will contain an
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* explanation of the error.
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*/
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popserver
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pop_open (host, username, password, flags)
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char *host;
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char *username;
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char *password;
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int flags;
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{
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int sock;
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popserver server;
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/* Determine the user name */
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if (! username)
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{
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username = getenv ("USER");
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if (! (username && *username))
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{
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username = getlogin ();
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if (! (username && *username))
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{
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struct passwd *passwd;
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passwd = getpwuid (getuid ());
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if (passwd && passwd->pw_name && *passwd->pw_name)
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{
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username = passwd->pw_name;
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}
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else
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{
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strcpy (pop_error, "Could not determine username");
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return (0);
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}
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}
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}
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}
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/*
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* Determine the mail host.
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*/
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if (! host)
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{
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host = getenv ("MAILHOST");
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}
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#ifdef HESIOD
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if ((! host) && (! (flags & POP_NO_HESIOD)))
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{
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struct hes_postoffice *office;
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office = hes_getmailhost (username);
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if (office && office->po_type && (! strcmp (office->po_type, "POP"))
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&& office->po_name && *office->po_name && office->po_host
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&& *office->po_host)
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{
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host = office->po_host;
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username = office->po_name;
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}
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}
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#endif
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#ifdef MAILHOST
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if (! host)
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{
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host = MAILHOST;
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}
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#endif
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if (! host)
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{
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strcpy (pop_error, "Could not determine POP server");
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return (0);
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}
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/* Determine the password */
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#ifdef KERBEROS
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#define DONT_NEED_PASSWORD (! (flags & POP_NO_KERBEROS))
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#else
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#define DONT_NEED_PASSWORD 0
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#endif
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if ((! password) && (! DONT_NEED_PASSWORD))
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{
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if (! (flags & POP_NO_GETPASS))
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{
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password = getpass ("Enter POP password:");
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}
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if (! password)
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{
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strcpy (pop_error, "Could not determine POP password");
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return (0);
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}
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}
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if (password)
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flags |= POP_NO_KERBEROS;
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else
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password = username;
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sock = socket_connection (host, flags);
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if (sock == -1)
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return (0);
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server = (popserver) malloc (sizeof (struct _popserver));
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if (! server)
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{
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strcpy (pop_error, "Out of memory in pop_open");
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return (0);
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}
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server->buffer = (char *) malloc (GETLINE_MIN);
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if (! server->buffer)
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{
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strcpy (pop_error, "Out of memory in pop_open");
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free ((char *) server);
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return (0);
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}
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server->file = sock;
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server->data = 0;
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server->buffer_index = 0;
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server->buffer_size = GETLINE_MIN;
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server->in_multi = 0;
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server->trash_started = 0;
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if (getok (server))
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return (0);
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/*
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* I really shouldn't use the pop_error variable like this, but....
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*/
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if (strlen (username) > ERROR_MAX - 6)
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{
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pop_close (server);
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strcpy (pop_error,
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"Username too long; recompile pop.c with larger ERROR_MAX");
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return (0);
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}
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sprintf (pop_error, "USER %s", username);
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if (sendline (server, pop_error) || getok (server))
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{
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return (0);
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}
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if (strlen (password) > ERROR_MAX - 6)
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{
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pop_close (server);
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strcpy (pop_error,
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"Password too long; recompile pop.c with larger ERROR_MAX");
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return (0);
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}
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sprintf (pop_error, "PASS %s", password);
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if (sendline (server, pop_error) || getok (server))
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{
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return (0);
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}
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return (server);
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}
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/*
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* Function: pop_stat
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*
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* Purpose: Issue the STAT command to the server and return (in the
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* value parameters) the number of messages in the maildrop and
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* the total size of the maildrop.
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*
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* Return value: 0 on success, or non-zero with an error in pop_error
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* in failure.
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*
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* Side effects: On failure, may make further operations on the
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* connection impossible.
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*/
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int
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pop_stat (server, count, size)
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popserver server;
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int *count;
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int *size;
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{
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char *fromserver;
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if (server->in_multi)
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{
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strcpy (pop_error, "In multi-line query in pop_stat");
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return (-1);
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}
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if (sendline (server, "STAT") || (pop_getline (server, &fromserver) < 0))
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return (-1);
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if (strncmp (fromserver, "+OK ", 4))
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{
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if (0 == strncmp (fromserver, "-ERR", 4))
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{
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strncpy (pop_error, fromserver, ERROR_MAX);
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}
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else
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{
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strcpy (pop_error,
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"Unexpected response from POP server in pop_stat");
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pop_trash (server);
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}
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return (-1);
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}
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*count = atoi (&fromserver[4]);
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fromserver = index (&fromserver[4], ' ');
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if (! fromserver)
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{
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strcpy (pop_error,
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"Badly formatted response from server in pop_stat");
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pop_trash (server);
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return (-1);
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}
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*size = atoi (fromserver + 1);
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return (0);
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}
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/*
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* Function: pop_list
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*
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* Purpose: Performs the POP "list" command and returns (in value
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* parameters) two malloc'd zero-terminated arrays -- one of
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* message IDs, and a parallel one of sizes.
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*
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* Arguments:
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* server The pop connection to talk to.
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* message The number of the one message about which to get
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* information, or 0 to get information about all
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* messages.
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*
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* Return value: 0 on success, non-zero with error in pop_error on
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* failure.
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*
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* Side effects: On failure, may make further operations on the
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* connection impossible.
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*/
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int
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pop_list (server, message, IDs, sizes)
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popserver server;
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int message;
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int **IDs;
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int **sizes;
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{
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int how_many, i;
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char *fromserver;
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if (server->in_multi)
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{
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strcpy (pop_error, "In multi-line query in pop_list");
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return (-1);
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}
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if (message)
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how_many = 1;
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else
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{
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int count, size;
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if (pop_stat (server, &count, &size))
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return (-1);
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how_many = count;
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}
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*IDs = (int *) malloc ((how_many + 1) * sizeof (int));
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*sizes = (int *) malloc ((how_many + 1) * sizeof (int));
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if (! (*IDs && *sizes))
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{
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strcpy (pop_error, "Out of memory in pop_list");
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return (-1);
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}
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if (message)
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{
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sprintf (pop_error, "LIST %d", message);
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if (sendline (server, pop_error))
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{
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free ((char *) *IDs);
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free ((char *) *sizes);
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return (-1);
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}
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if (pop_getline (server, &fromserver) < 0)
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{
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free ((char *) *IDs);
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free ((char *) *sizes);
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return (-1);
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}
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if (strncmp (fromserver, "+OK ", 4))
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{
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if (! strncmp (fromserver, "-ERR", 4))
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strncpy (pop_error, fromserver, ERROR_MAX);
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else
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{
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strcpy (pop_error,
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"Unexpected response from server in pop_list");
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pop_trash (server);
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}
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free ((char *) *IDs);
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free ((char *) *sizes);
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return (-1);
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}
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(*IDs)[0] = atoi (&fromserver[4]);
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fromserver = index (&fromserver[4], ' ');
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if (! fromserver)
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{
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strcpy (pop_error,
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"Badly formatted response from server in pop_list");
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pop_trash (server);
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free ((char *) *IDs);
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free ((char *) *sizes);
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return (-1);
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}
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(*sizes)[0] = atoi (fromserver);
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(*IDs)[1] = (*sizes)[1] = 0;
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return (0);
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}
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else
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{
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if (pop_multi_first (server, "LIST", &fromserver))
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{
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free ((char *) *IDs);
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free ((char *) *sizes);
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return (-1);
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}
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for (i = 0; i < how_many; i++)
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{
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if (pop_multi_next (server, &fromserver) <= 0)
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{
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free ((char *) *IDs);
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free ((char *) *sizes);
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return (-1);
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}
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(*IDs)[i] = atoi (fromserver);
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fromserver = index (fromserver, ' ');
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if (! fromserver)
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{
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strcpy (pop_error,
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"Badly formatted response from server in pop_list");
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free ((char *) *IDs);
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free ((char *) *sizes);
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pop_trash (server);
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return (-1);
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}
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(*sizes)[i] = atoi (fromserver);
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}
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if (pop_multi_next (server, &fromserver) < 0)
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{
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free ((char *) *IDs);
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free ((char *) *sizes);
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return (-1);
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}
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else if (fromserver)
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{
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strcpy (pop_error,
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"Too many response lines from server in pop_list");
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free ((char *) *IDs);
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free ((char *) *sizes);
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return (-1);
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}
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(*IDs)[i] = (*sizes)[i] = 0;
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return (0);
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}
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}
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/*
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* Function: pop_retrieve
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*
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* Purpose: Retrieve a specified message from the maildrop.
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*
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* Arguments:
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* server The server to retrieve from.
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* message The message number to retrieve.
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* markfrom
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* If true, then mark the string "From " at the beginning
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* of lines with '>'.
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* msg_buf Output parameter to which a buffer containing the
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* message is assigned.
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*
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* Return value: The number of bytes in msg_buf, which may contain
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|
* embedded nulls, not including its final null, or -1 on error
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|
* with pop_error set.
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*
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* Side effects: May kill connection on error.
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*/
|
|
int
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pop_retrieve (server, message, markfrom, msg_buf)
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popserver server;
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int message;
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int markfrom;
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|
char **msg_buf;
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|
{
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|
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++] = '>';
|
|
}
|
|
bcopy (fromserver, &ptr[cp], ret);
|
|
cp += ret;
|
|
ptr[cp++] = '\n';
|
|
}
|
|
|
|
free (ptr);
|
|
return (-1);
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
/*
|
|
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 (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));
|
|
}
|
|
|
|
/*
|
|
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 (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);
|
|
}
|
|
|
|
if (sendline (server, command) || (pop_getline (server, response) < 0))
|
|
{
|
|
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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
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 (server, line)
|
|
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 (server)
|
|
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 (server, message)
|
|
popserver server;
|
|
int message;
|
|
{
|
|
if (server->in_multi)
|
|
{
|
|
strcpy (pop_error, "In multi-line query in pop_delete");
|
|
return (-1);
|
|
}
|
|
|
|
sprintf (pop_error, "DELE %d", message);
|
|
|
|
if (sendline (server, pop_error) || getok (server))
|
|
return (-1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Function: pop_noop
|
|
*
|
|
* Purpose: Send a noop command to the server.
|
|
*
|
|
* Argument:
|
|
* server The server to send to.
|
|
*
|
|
* Return value: 0 on success, non-zero with error in pop_error
|
|
* otherwise.
|
|
*
|
|
* Side effects: Closes connection on error.
|
|
*/
|
|
int
|
|
pop_noop (server)
|
|
popserver server;
|
|
{
|
|
if (server->in_multi)
|
|
{
|
|
strcpy (pop_error, "In multi-line query in pop_noop");
|
|
return (-1);
|
|
}
|
|
|
|
if (sendline (server, "NOOP") || getok (server))
|
|
return (-1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Function: pop_last
|
|
*
|
|
* Purpose: Find out the highest seen message from the server.
|
|
*
|
|
* Arguments:
|
|
* server The server.
|
|
*
|
|
* Return value: If successful, the highest seen message, which is
|
|
* greater than or equal to 0. Otherwise, a negative number with
|
|
* the error explained in pop_error.
|
|
*
|
|
* Side effects: Closes the connection on error.
|
|
*/
|
|
int
|
|
pop_last (server)
|
|
popserver server;
|
|
{
|
|
char *fromserver;
|
|
|
|
if (server->in_multi)
|
|
{
|
|
strcpy (pop_error, "In multi-line query in pop_last");
|
|
return (-1);
|
|
}
|
|
|
|
if (sendline (server, "LAST"))
|
|
return (-1);
|
|
|
|
if (pop_getline (server, &fromserver) < 0)
|
|
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.
|
|
*
|
|
* Side Effects: The popserver passed in is unusable after this
|
|
* 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);
|
|
}
|
|
|
|
#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 (host, flags)
|
|
char *host;
|
|
int flags;
|
|
{
|
|
struct hostent *hostent;
|
|
struct servent *servent;
|
|
struct sockaddr_in addr;
|
|
char found_port = 0;
|
|
char *service;
|
|
int sock;
|
|
#ifdef KERBEROS
|
|
#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;
|
|
char *realhost;
|
|
#endif /* KERBEROS5 */
|
|
#endif /* KERBEROS */
|
|
|
|
int try_count = 0;
|
|
|
|
#ifdef WINDOWSNT
|
|
{
|
|
WSADATA winsockData;
|
|
if (WSAStartup (0x101, &winsockData) == 0)
|
|
have_winsock = 1;
|
|
}
|
|
#endif
|
|
|
|
bzero ((char *) &addr, sizeof (addr));
|
|
addr.sin_family = AF_INET;
|
|
|
|
#ifdef KERBEROS
|
|
service = (flags & POP_NO_KERBEROS) ? POP_SERVICE : KPOP_SERVICE;
|
|
#else
|
|
service = POP_SERVICE;
|
|
#endif
|
|
|
|
#ifdef HESIOD
|
|
if (! (flags & POP_NO_HESIOD))
|
|
{
|
|
servent = hes_getservbyname (service, "tcp");
|
|
if (servent)
|
|
{
|
|
addr.sin_port = servent->s_port;
|
|
found_port = 1;
|
|
}
|
|
}
|
|
#endif
|
|
if (! found_port)
|
|
{
|
|
servent = getservbyname (service, "tcp");
|
|
if (servent)
|
|
{
|
|
addr.sin_port = servent->s_port;
|
|
}
|
|
else
|
|
{
|
|
#ifdef KERBEROS
|
|
addr.sin_port = htons ((flags & POP_NO_KERBEROS) ?
|
|
POP_PORT : KPOP_PORT);
|
|
#else
|
|
addr.sin_port = htons (POP_PORT);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#define POP_SOCKET_ERROR "Could not create socket for POP connection: "
|
|
|
|
sock = socket (PF_INET, SOCK_STREAM, 0);
|
|
if (sock < 0)
|
|
{
|
|
strcpy (pop_error, POP_SOCKET_ERROR);
|
|
strncat (pop_error, strerror (errno),
|
|
ERROR_MAX - sizeof (POP_SOCKET_ERROR));
|
|
return (-1);
|
|
|
|
}
|
|
|
|
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)
|
|
{
|
|
bcopy (*hostent->h_addr_list, (char *) &addr.sin_addr,
|
|
hostent->h_length);
|
|
if (! connect (sock, (struct sockaddr *) &addr, sizeof (addr)))
|
|
break;
|
|
hostent->h_addr_list++;
|
|
}
|
|
|
|
#define CONNECT_ERROR "Could not connect to POP server: "
|
|
|
|
if (! *hostent->h_addr_list)
|
|
{
|
|
CLOSESOCKET (sock);
|
|
strcpy (pop_error, CONNECT_ERROR);
|
|
strncat (pop_error, strerror (errno),
|
|
ERROR_MAX - sizeof (CONNECT_ERROR));
|
|
return (-1);
|
|
|
|
}
|
|
|
|
#ifdef KERBEROS
|
|
#define KRB_ERROR "Kerberos error connecting to POP server: "
|
|
if (! (flags & POP_NO_KERBEROS))
|
|
{
|
|
#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);
|
|
strcpy (pop_error, KRB_ERROR);
|
|
strncat (pop_error, error_message (rem),
|
|
ERROR_MAX - sizeof(KRB_ERROR));
|
|
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 = hostent->h_name; *cp; cp++)
|
|
{
|
|
if (isupper (*cp))
|
|
{
|
|
*cp = tolower (*cp);
|
|
}
|
|
}
|
|
|
|
if (rem = krb5_sname_to_principal (kcontext, hostent->h_name,
|
|
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)
|
|
{
|
|
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)
|
|
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));
|
|
realhost = strdup (hostent->h_name);
|
|
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);
|
|
free (realhost);
|
|
if (rem != KSUCCESS)
|
|
{
|
|
strcpy (pop_error, KRB_ERROR);
|
|
strncat (pop_error, krb_err_txt[rem],
|
|
ERROR_MAX - sizeof (KRB_ERROR));
|
|
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 (server, line)
|
|
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
|
|
{
|
|
bcopy (server->buffer + server->buffer_index,
|
|
server->buffer, 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)
|
|
{
|
|
strcpy (pop_error, GETLINE_ERROR);
|
|
strncat (pop_error, strerror (errno),
|
|
ERROR_MAX - sizeof (GETLINE_ERROR));
|
|
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 (server, line)
|
|
popserver server;
|
|
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);
|
|
strcpy (pop_error, SENDLINE_ERROR);
|
|
strncat (pop_error, strerror (errno),
|
|
ERROR_MAX - sizeof (SENDLINE_ERROR));
|
|
return (ret);
|
|
}
|
|
|
|
if (pop_debug)
|
|
fprintf (stderr, ">>> %s\n", line);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Procedure: fullwrite
|
|
*
|
|
* Purpose: Just like write, but keeps trying until the entire string
|
|
* has been written.
|
|
*
|
|
* Return value: Same as write. Pop_error is not set.
|
|
*/
|
|
static int
|
|
fullwrite (fd, buf, nbytes)
|
|
int fd;
|
|
char *buf;
|
|
int nbytes;
|
|
{
|
|
char *cp;
|
|
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 (server)
|
|
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))
|
|
{
|
|
strncpy (pop_error, fromline, ERROR_MAX);
|
|
pop_error[ERROR_MAX-1] = '\0';
|
|
return (-1);
|
|
}
|
|
else
|
|
{
|
|
strcpy (pop_error,
|
|
"Unexpected response from server; expecting +OK or -ERR");
|
|
pop_trash (server);
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* Function: gettermination
|
|
*
|
|
* Purpose: Gets the next line and verifies that it is a termination
|
|
* line (nothing but a dot).
|
|
*
|
|
* Return value: 0 on success, non-zero with pop_error set on error.
|
|
*
|
|
* Side effects: Closes the connection on error.
|
|
*/
|
|
static int
|
|
gettermination (server)
|
|
popserver server;
|
|
{
|
|
char *fromserver;
|
|
|
|
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 (server)
|
|
popserver server;
|
|
{
|
|
pop_trash (server);
|
|
free ((char *) server);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Function: pop_trash
|
|
*
|
|
* Purpose: Like pop_close or pop_quit, but doesn't deallocate the
|
|
* memory associated with the server. It is legal to call
|
|
* pop_close or pop_quit after this function has been called.
|
|
*/
|
|
static void
|
|
pop_trash (server)
|
|
popserver server;
|
|
{
|
|
if (server->file >= 0)
|
|
{
|
|
/* 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 (in_string, len)
|
|
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 */
|
|
|
|
/* arch-tag: ceb37041-b7ad-49a8-a63d-286618b8367d
|
|
(do not change this comment) */
|