1371 lines
29 KiB
C
1371 lines
29 KiB
C
/* pop.c: client routines for talking to a POP3-protocol post-office server
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Copyright (c) 1991,1993 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#include <protos.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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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 HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include <pop.h>
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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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#ifdef HAVE_PWD_H
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#include <pwd.h>
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#endif
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#include <errno.h>
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#ifdef SOCKS
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#include <socks.h>
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/* This doesn't belong here. */
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struct tm *localtime(const time_t *);
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struct hostent *gethostbyname(const char *);
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#endif
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#ifdef HAVE_OPENSSL
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#include <openssl/des.h>
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#else
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#include <des.h>
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#endif
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#include <krb.h>
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#include <roken.h>
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static int socket_connection ( char *, int );
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static char *pop_getline ( popserver );
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static int sendline ( popserver, char * );
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static int fullwrite ( int, char *, int );
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static int getok ( popserver );
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#if 0
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static int gettermination ( popserver );
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#endif
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static void pop_trash ( popserver );
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static char *find_crlf ( char * );
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#if defined(__ultrix) || defined(IRIX4)
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char *getpass(const char*);
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#endif
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#define ERROR_MAX 80 /* a pretty arbitrary size */
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#define POP_PORT 110
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#define KPOP_PORT 1109
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#define POP_SERVICE "pop"
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#define KPOP_SERVICE "kpop"
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char pop_error[ERROR_MAX];
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int pop_debug = 0;
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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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#define DONT_NEED_PASSWORD (! (flags & POP_NO_KERBEROS))
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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 (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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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") || (! (fromserver = pop_getline (server))))
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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 = strchr (&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 (*IDs);
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free (*sizes);
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return (-1);
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}
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if (! (fromserver = pop_getline (server)))
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{
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free (*IDs);
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free (*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 (*IDs);
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free (*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 = strchr (&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 (*IDs);
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free (*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 (*IDs);
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free (*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))
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{
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free (*IDs);
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free (*sizes);
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return (-1);
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}
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(*IDs)[i] = atoi (fromserver);
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fromserver = strchr (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 (*IDs);
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free (*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))
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{
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free (*IDs);
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free (*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 (*IDs);
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free (*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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*
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* Return value: A string pointing to the message, if successful, or
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* null with pop_error set if not.
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*
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* Side effects: May kill connection on error.
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*/
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char *
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pop_retrieve (server, message, markfrom)
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popserver server;
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int message;
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int markfrom;
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{
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int *IDs, *sizes, bufsize, fromcount = 0, cp = 0;
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char *ptr, *fromserver;
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int ret;
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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_retrieve");
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return (0);
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}
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if (pop_list (server, message, &IDs, &sizes))
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return (0);
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if (pop_retrieve_first (server, message, &fromserver))
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{
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return (0);
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}
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/*
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* The "5" below is an arbitrary constant -- I assume that if
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* there are "From" lines in the text to be marked, there
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* probably won't be more than 5 of them. If there are, I
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* allocate more space for them below.
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*/
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bufsize = sizes[0] + (markfrom ? 5 : 0);
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ptr = malloc (bufsize);
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free (IDs);
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free (sizes);
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if (! ptr)
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{
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strcpy (pop_error, "Out of memory in pop_retrieve");
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pop_retrieve_flush (server);
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return (0);
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}
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while (! (ret = pop_retrieve_next (server, &fromserver)))
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{
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int linesize;
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if (! fromserver)
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{
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ptr[cp] = '\0';
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return (ptr);
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}
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if (markfrom && fromserver[0] == 'F' && fromserver[1] == 'r' &&
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fromserver[2] == 'o' && fromserver[3] == 'm' &&
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fromserver[4] == ' ')
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{
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if (++fromcount == 5)
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{
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bufsize += 5;
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ptr = realloc (ptr, bufsize);
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if (! ptr)
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{
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strcpy (pop_error, "Out of memory in pop_retrieve");
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pop_retrieve_flush (server);
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return (0);
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}
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fromcount = 0;
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}
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ptr[cp++] = '>';
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}
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linesize = strlen (fromserver);
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memcpy (&ptr[cp], fromserver, linesize);
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cp += linesize;
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ptr[cp++] = '\n';
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}
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if (ret)
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{
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free (ptr);
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return (0);
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}
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return (0);
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}
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int
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pop_retrieve_first (server, message, response)
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popserver server;
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int message;
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char **response;
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{
|
|
sprintf (pop_error, "RETR %d", message);
|
|
return (pop_multi_first (server, pop_error, response));
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
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) || (! (*response = pop_getline (server))))
|
|
{
|
|
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);
|
|
}
|
|
}
|
|
|
|
int
|
|
pop_multi_next (server, line)
|
|
popserver server;
|
|
char **line;
|
|
{
|
|
char *fromserver;
|
|
|
|
if (! server->in_multi)
|
|
{
|
|
strcpy (pop_error, "Not in multi-line query in pop_multi_next");
|
|
return (-1);
|
|
}
|
|
|
|
fromserver = pop_getline (server);
|
|
if (! fromserver)
|
|
{
|
|
return (-1);
|
|
}
|
|
|
|
if (fromserver[0] == '.')
|
|
{
|
|
if (! fromserver[1])
|
|
{
|
|
*line = 0;
|
|
server->in_multi = 0;
|
|
return (0);
|
|
}
|
|
else
|
|
{
|
|
*line = fromserver + 1;
|
|
return (0);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
*line = fromserver;
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
int
|
|
pop_multi_flush (server)
|
|
popserver server;
|
|
{
|
|
char *line;
|
|
|
|
if (! server->in_multi)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
while (! pop_multi_next (server, &line))
|
|
{
|
|
if (! line)
|
|
{
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
return (-1);
|
|
}
|
|
|
|
/* 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 (! (fromserver = pop_getline (server)))
|
|
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 unuseable 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 (server);
|
|
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct hostent *hostent;
|
|
struct sockaddr_in addr;
|
|
char found_port = 0;
|
|
char *service;
|
|
int sock;
|
|
KTEXT ticket;
|
|
MSG_DAT msg_data;
|
|
CREDENTIALS cred;
|
|
Key_schedule schedule;
|
|
int rem;
|
|
|
|
int try_count = 0;
|
|
|
|
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);
|
|
|
|
memset (&addr, 0, sizeof (addr));
|
|
addr.sin_family = AF_INET;
|
|
|
|
service = (flags & POP_NO_KERBEROS) ? POP_SERVICE : KPOP_SERVICE;
|
|
|
|
#ifdef HESIOD
|
|
if (! (flags & POP_NO_HESIOD))
|
|
{
|
|
struct servent *servent = hes_getservbyname (service, "tcp");
|
|
if (servent)
|
|
{
|
|
addr.sin_port = servent->s_port;
|
|
found_port = 1;
|
|
}
|
|
}
|
|
#endif
|
|
if (! found_port)
|
|
{
|
|
addr.sin_port = k_getportbyname (service, "tcp",
|
|
htons((flags & POP_NO_KERBEROS) ?
|
|
POP_PORT : KPOP_PORT));
|
|
}
|
|
|
|
#define SOCKET_ERROR "Could not create socket for POP connection: "
|
|
|
|
sock = socket (PF_INET, SOCK_STREAM, 0);
|
|
if (sock < 0)
|
|
{
|
|
strcpy (pop_error, SOCKET_ERROR);
|
|
strncat (pop_error, strerror (errno),
|
|
ERROR_MAX - sizeof (SOCKET_ERROR));
|
|
return (-1);
|
|
|
|
}
|
|
|
|
|
|
while (*hostent->h_addr_list)
|
|
{
|
|
memcpy (&addr.sin_addr, *hostent->h_addr_list, sizeof(addr.sin_addr));
|
|
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)
|
|
{
|
|
close (sock);
|
|
strcpy (pop_error, CONNECT_ERROR);
|
|
strncat (pop_error, strerror (errno),
|
|
ERROR_MAX - sizeof (CONNECT_ERROR));
|
|
return (-1);
|
|
|
|
}
|
|
|
|
#define KRB_ERROR "Kerberos error connecting to POP server: "
|
|
if (! (flags & POP_NO_KERBEROS))
|
|
{
|
|
char *hostname = strdup((char *)hostent->h_name);
|
|
ticket = (KTEXT) malloc (sizeof (KTEXT_ST));
|
|
rem = krb_sendauth (0L, sock, ticket, "pop", hostname,
|
|
krb_realmofhost (hostname),
|
|
0UL, &msg_data, &cred, schedule,
|
|
(struct sockaddr_in *) 0,
|
|
(struct sockaddr_in *) 0,
|
|
"KPOPV0.1");
|
|
free (ticket);
|
|
free (hostname);
|
|
if (rem != KSUCCESS)
|
|
{
|
|
strcpy (pop_error, KRB_ERROR);
|
|
strncat (pop_error, krb_get_err_text(rem),
|
|
ERROR_MAX - sizeof (KRB_ERROR));
|
|
close (sock);
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
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: A non-null pointer if successful, or a null pointer on any
|
|
* error, with an error message copied into pop_error.
|
|
*
|
|
* Notes: The line returned is overwritten with each call to pop_getline.
|
|
*
|
|
* Side effects: Closes the connection on error.
|
|
*/
|
|
static char *
|
|
pop_getline (popserver server)
|
|
{
|
|
#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);
|
|
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)
|
|
fprintf (stderr, "<<< %s\n", server->buffer + found);
|
|
return (server->buffer + found);
|
|
}
|
|
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 = realloc (server->buffer, server->buffer_size);
|
|
if (! server->buffer)
|
|
{
|
|
strcpy (pop_error, "Out of memory in pop_getline");
|
|
pop_trash (server);
|
|
return (0);
|
|
}
|
|
}
|
|
ret = read (server->file, server->buffer + server->data,
|
|
server->buffer_size - server->data - 1);
|
|
if (ret < 0)
|
|
{
|
|
strcpy (pop_error, GETLINE_ERROR);
|
|
strncat (pop_error, strerror (errno),
|
|
ERROR_MAX - sizeof (GETLINE_ERROR));
|
|
pop_trash (server);
|
|
return (0);
|
|
}
|
|
else if (ret == 0)
|
|
{
|
|
strcpy (pop_error, "Unexpected EOF from server in pop_getline");
|
|
pop_trash (server);
|
|
return (0);
|
|
}
|
|
else
|
|
{
|
|
char *cp;
|
|
server->data += ret;
|
|
server->buffer[server->data] = '\0';
|
|
|
|
cp = find_crlf (server->buffer + 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);
|
|
return (server->buffer);
|
|
}
|
|
search_offset += ret;
|
|
}
|
|
}
|
|
|
|
/* 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, char *line)
|
|
{
|
|
#define SENDLINE_ERROR "Error writing to POP server: "
|
|
int ret;
|
|
|
|
ret = fullwrite (server->file, line, strlen (line));
|
|
if (ret >= 0)
|
|
{ /* 0 indicates that a blank line was written */
|
|
ret = fullwrite (server->file, "\r\n", 2);
|
|
}
|
|
|
|
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 (int fd, char *buf, int nbytes)
|
|
{
|
|
char *cp;
|
|
int ret;
|
|
|
|
cp = buf;
|
|
while ((ret = write (fd, cp, nbytes)) > 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 unuseable.
|
|
*/
|
|
static int
|
|
getok (popserver server)
|
|
{
|
|
char *fromline;
|
|
|
|
if (! (fromline = pop_getline (server)))
|
|
{
|
|
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;
|
|
|
|
fromserver = pop_getline (server);
|
|
if (! fromserver)
|
|
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 unuseable 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 (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 (popserver server)
|
|
{
|
|
if (server->file >= 0)
|
|
{
|
|
sendline (server, "RSET");
|
|
sendline (server, "QUIT");
|
|
|
|
close (server->file);
|
|
server->file = -1;
|
|
if (server->buffer)
|
|
{
|
|
free (server->buffer);
|
|
server->buffer = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Return a pointer to the first CRLF in IN_STRING,
|
|
or 0 if it does not contain one. */
|
|
|
|
static char *
|
|
find_crlf (char *in_string)
|
|
{
|
|
while (1)
|
|
{
|
|
if (! *in_string)
|
|
return (0);
|
|
else if (*in_string == '\r')
|
|
{
|
|
if (*++in_string == '\n')
|
|
return (in_string - 1);
|
|
}
|
|
else
|
|
in_string++;
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|