/*

  *  Copyright (C) 2002-2006 Nigel Horne <njh@bandsman.co.uk>

  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software

  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  *  MA 02110-1301, USA.

  */

 static	char	const	rcsid[] = "$Id: mbox.c,v 1.380 2007/02/13 19:47:37 njh Exp $";

 
 #ifdef	_MSC_VER
 #include <winsock.h>	/* only needed in CL_EXPERIMENTAL */
 #endif

 
 #if HAVE_CONFIG_H
 #include "clamav-config.h"
 #endif

 
 #ifndef	CL_DEBUG

 #define	NDEBUG	/* map CLAMAV debug onto standard */

 #endif
 
 #ifdef CL_THREAD_SAFE

 #ifndef	_REENTRANT

 #define	_REENTRANT	/* for Solaris 2.8 */
 #endif

 #endif

 
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <assert.h>
 #include <string.h>

 #ifdef	HAVE_STRINGS_H

 #include <strings.h>

 #endif

 #include <ctype.h>
 #include <time.h>
 #include <fcntl.h>

 #ifdef	HAVE_SYS_PARAM_H

 #include <sys/param.h>

 #endif
 #include "clamav.h"
 #ifndef	C_WINDOWS

 #include <dirent.h>

 #endif

 #include <limits.h>

 #include <signal.h>

 #ifdef	HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 

 #if defined(HAVE_READDIR_R_3) || defined(HAVE_READDIR_R_2)
 #include <stddef.h>
 #endif
 

 #ifdef	CL_THREAD_SAFE
 #include <pthread.h>
 #endif
 

 #include "others.h"
 #include "defaults.h"
 #include "str.h"
 #include "filetypes.h"

 #include "mbox.h"
 

 #ifdef	CL_DEBUG

 #if	defined(C_LINUX) || defined(C_CYGWIN)

 #include <features.h>

 #endif

 #if __GLIBC__ == 2 && __GLIBC_MINOR__ >= 1
 #define HAVE_BACKTRACE
 #endif

 #endif

 
 #ifdef HAVE_BACKTRACE
 #include <execinfo.h>
 #include <syslog.h>
 
 static	void	sigsegv(int sig);
 static	void	print_trace(int use_syslog);
 #endif
 

 #if	defined(NO_STRTOK_R) || !defined(CL_THREAD_SAFE)

 #undef strtok_r
 #undef __strtok_r
 #define strtok_r(a,b,c)	strtok(a,b)
 #endif
 

 #ifdef	HAVE_STDBOOL_H

 #ifdef	C_BEOS
 #include "SupportDefs.h"
 #else

 #include <stdbool.h>

 #endif

 #else
 #ifdef	FALSE
 typedef	unsigned	char	bool;
 #else
 typedef enum	{ FALSE = 0, TRUE = 1 } bool;

 #endif
 #endif
 

 typedef	enum {
 	FAIL,
 	OK,
 	OK_ATTACHMENTS_NOT_SAVED,
 	VIRUS
 } mbox_status;
 

 #ifndef isblank
 #define isblank(c)	(((c) == ' ') || ((c) == '\t'))
 #endif
 

 #define	SAVE_TO_DISC	/* multipart/message are saved in a temporary file */

 #ifndef CL_EXPERIMENTAL

 /*

  * Code does exist to run FOLLOWURLS on systems without libcurl, however that

  * is not recommended so it is not compiled by default

  *

  * On Solaris, when using the GNU C compiler, the clamAV build system uses the
  * Sun supplied ld instead of the GNU ld causing an error. Therefore you cannot
  * use WITH_CURL on Solaris with gcc, you must configure with
  * "--without-libcurl". I don't know if it works with Sun's own compiler
  *

  * Fails to link on Solaris 10 with this error:

  *      Undefined			first referenced
  *  symbol				in file
  *  __floatdidf				/opt/sfw/lib/libcurl.s

  */

 #if	defined(C_SOLARIS) && defined(__GNUC__)

 #undef	WITH_CURL
 #endif

 #endif

 #if	defined(WITH_CURL) || defined(CL_EXPERIMENTAL)

 #define	FOLLOWURLS	5	/*
 				 * Maximum number of URLs scanned in a message

 				 * part. Helps to prevent Dialer.gen-45 and
 				 * Trojan.WinREG.Zapchast which are often
 				 * dispatched by emails which point to it. If

 				 * not defined, don't check any URLs
 				 */

 #endif

 #ifdef	FOLLOWURLS

 #include "htmlnorm.h"
 #endif
 
 #ifdef CL_EXPERIMENTAL
 #include "phishcheck.h"
 #endif
 

 #ifdef	FOLLOWURLS

 #ifndef	C_WINDOWS
 #include <netdb.h>
 #include <sys/socket.h>
 #include <netinet/in.h>

 #ifndef	C_BEOS

 #include <net/if.h>
 #include <arpa/inet.h>
 #endif

 #endif

 
 #ifndef	C_WINDOWS
 #define	closesocket(s)	close(s)
 #endif
 
 #ifdef	CL_EXPERIMENTAL	/* dropping curl support */
 

 #include <fcntl.h>
 #ifndef	C_WINDOWS
 #include <sys/time.h>
 #endif
 
 #ifndef HAVE_IN_PORT_T
 typedef	unsigned	short	in_port_t;
 #endif
 
 #ifndef HAVE_IN_ADDR_T
 typedef	unsigned	int	in_addr_t;
 #endif
 
 #if	(!defined(EALREADY)) && (defined(WSAEALREADY))
 #define EALREADY	WSAEALREADY
 #endif
 #if	(!defined(EINPROGRESS)) && (defined(WSAEINPROGRESS))
 #define EINPROGRESS	WSAEINPROGRESS
 #endif
 #if	(!defined(EISCONN)) && (defined(WSAEISCONN))
 #define EISCONN	WSAEISCONN
 #endif
 
 #else
 

 #ifdef	WITH_CURL	/* Set in configure */
 /*
  * To build with WITH_CURL:
  * LDFLAGS=`curl-config --libs` ./configure ...
  */

 #include <curl/curl.h>

 
 /*

  * Needs curl >= 7.11 (I've heard that 7.9 can cause crashes and I have seen
  *	7.10 segfault, later versions can be flakey as well)

  * untested)

  *
  * Even 7.15 crashes, valgrind shows this:
  *	==2835== Warning: client switching stacks?  SP change: 0xBEB0FD2C --> 0xD0678F0
 *	==2835==          to suppress, use: --max-stackframe=1314225092 or greater
 
  *	==2835== Invalid write of size 4
  *	==2835==    at 0x40F67BD: Curl_resolv (in /usr/lib/libcurl.so.3.0.0)
  *	==2835==  Address 0xD0678F4 is on thread 1's stack
  *	==2835== Can't extend stack to 0xD067390 during signal delivery for thread 1:
  *	==2835==   no stack segment
  *	==2835==
  *	==2835== Process terminating with default action of signal 11 (SIGSEGV)
  *	==2835==  Access not within mapped region at address 0xD067390
  *	==2835==    at 0x40F67BD: Curl_resolv (in /usr/lib/libcurl.so.3.0.0)
  *
  * This bug has been reported upstream, however they claim that the bug

  *	does not exist :-(. I have received reports that 7.15.5 suffers from the
  *	same problem in Curl_resolv
  *
  * TODO: Drop curl and do it ourselves

  */

 #if	(LIBCURL_VERSION_NUM < 0x070B00)

 #undef	WITH_CURL	/* also undef FOLLOWURLS? */
 #endif
 

 #else
 #error	"FOLLOWURLS without CURL is no longer supported"
 

 #endif	/*WITH_CURL*/
 

 #endif	/* CL_EXPERIMENTAL */
 

 #else	/*!FOLLOWURLS*/
 #undef	WITH_CURL

 #endif	/*FOLLOWURLS*/

 /*

  * Define this to handle messages covered by section 7.3.2 of RFC1341.

  *	This is experimental code so it is up to YOU to (1) ensure it's secure

  * (2) periodically trim the directory of old files
  *
  * If you use the load balancing feature of clamav-milter to run clamd on

  * more than one machine you must make sure that .../partial is on a shared

  * network filesystem

  */

 #ifndef	C_WINDOWS	/* TODO: when opendir() is done */

 #define	PARTIAL_DIR

 #endif

 /*#define	NEW_WORLD*/

 /*#define	SCAN_UNENCODED_BOUNCES	*//*

 					 * Slows things down a lot and only catches unencoded copies

 					 * of EICAR within bounces, which don't matter

 					 */
 

 typedef	struct	mbox_ctx {
 	const	char	*dir;
 	const	table_t	*rfc821Table;
 	const	table_t	*subtypeTable;
 	cli_ctx	*ctx;
 } mbox_ctx;
 

 static	int	cli_parse_mbox(const char *dir, int desc, cli_ctx *ctx);

 static	message	*parseEmailFile(FILE *fin, const table_t *rfc821Table, const char *firstLine, const char *dir);

 static	message	*parseEmailHeaders(message *m, const table_t *rfc821Table);

 static	int	parseEmailHeader(message *m, const char *line, const table_t *rfc821Table);

 static	mbox_status	parseEmailBody(message *messageIn, text *textIn, mbox_ctx *mctx, unsigned int recursion_level);

 static	int	boundaryStart(const char *line, const char *boundary);
 static	int	endOfMessage(const char *line, const char *boundary);
 static	int	initialiseTables(table_t **rfc821Table, table_t **subtypeTable);
 static	int	getTextPart(message *const messages[], size_t size);
 static	size_t	strip(char *buf, int len);
 static	int	parseMimeHeader(message *m, const char *cmd, const table_t *rfc821Table, const char *arg);

 static	void	saveTextPart(message *m, const char *dir, int destroy_text);

 static	char	*rfc2047(const char *in);

 static	char	*rfc822comments(const char *in, char *out);

 #ifdef	PARTIAL_DIR
 static	int	rfc1341(message *m, const char *dir);
 #endif

 static	bool	usefulHeader(int commandNumber, const char *cmd);

 static	char	*getline_from_mbox(char *buffer, size_t len, FILE *fin);

 static	bool	isBounceStart(const char *line);

 static	bool	exportBinhexMessage(const char *dir, message *m);
 static	int	exportBounceMessage(text *start, const mbox_ctx *ctx);

 static	message	*do_multipart(message *mainMessage, message **messages, int i, mbox_status *rc, mbox_ctx *mctx, message *messageIn, text **tptr, unsigned int recursion_level);

 static	int	count_quotes(const char *buf);

 static	bool	next_is_folded_header(const text *t);

 static	bool	newline_in_header(const char *line);

 static	void	checkURLs(message *m, mbox_ctx *mctx, mbox_status *rc, int is_html);

 
 #ifdef CL_EXPERIMENTAL

 static	void	do_checkURLs(message *m, const char *dir, tag_arguments_t *hrefs);
 static	blob	*getHrefs(message *m, tag_arguments_t *hrefs);
 static	void	hrefs_done(blob *b, tag_arguments_t *hrefs);

 #endif
 

 #if	defined(FOLLOWURLS) && (FOLLOWURLS > 0)

 struct arg {

 #ifdef	CL_EXPERIMENTAL

 	char *url;
 #else

 	CURL *curl;

 	const char *url;

 #endif

 	const char *dir;

 	char *filename;
 };
 #ifdef	CL_THREAD_SAFE
 static	void	*getURL(void *a);
 #else
 static	void	*getURL(struct arg *arg);
 #endif

 #endif
 

 /* Maximum line length according to RFC821 */

 #define	RFC2821LENGTH	1000

 
 /* Hashcodes for our hash tables */
 #define	CONTENT_TYPE			1
 #define	CONTENT_TRANSFER_ENCODING	2
 #define	CONTENT_DISPOSITION		3
 
 /* Mime sub types */
 #define	PLAIN		1
 #define	ENRICHED	2
 #define	HTML		3
 #define	RICHTEXT	4
 #define	MIXED		5

 #define	ALTERNATIVE	6	/* RFC1521*/

 #define	DIGEST		7
 #define	SIGNED		8
 #define	PARALLEL	9
 #define	RELATED		10	/* RFC2387 */
 #define	REPORT		11	/* RFC1892 */

 #define	APPLEDOUBLE	12	/* Handling of this in only noddy for now */

 #define	FAX		MIXED	/*
 				 * RFC3458
 				 * Drafts stated to treat is as mixed if it is
 				 * not known.  This disappeared in the final
 				 * version (except when talking about
 				 * voice-message), but it is good enough for us
 				 * since we do no validation of coversheet
 				 * presence etc. (which also has disappeared
 				 * in the final version)
 				 */

 #define	ENCRYPTED	13	/*
 				 * e.g. RFC2015
 				 * Content-Type: multipart/encrypted;
 				 * boundary="nextPart1383049.XCRrrar2yq";
 				 * protocol="application/pgp-encrypted"
 				 */

 #define	X_BFILE		RELATED	/*
 				 * BeOS, expert two parts: the file and it's
 				 * attributes. The attributes part comes as
 				 *	Content-Type: application/x-be_attribute
 				 *		name="foo"
 				 * I can't find where it is defined, any
 				 * pointers would be appreciated. For now
 				 * we treat it as multipart/related
 				 */

 #define	KNOWBOT		14	/* Unknown and undocumented format? */

 
 static	const	struct tableinit {
 	const	char	*key;
 	int	value;
 } rfc821headers[] = {

 	/* TODO: make these regular expressions */

 	{	"Content-Type",			CONTENT_TYPE		},

 	{	"Content-Transfer-Encoding",	CONTENT_TRANSFER_ENCODING	},
 	{	"Content-Disposition",		CONTENT_DISPOSITION	},

 	{	NULL,				0			}

 }, mimeSubtypes[] = {	/* see RFC2045 */

 		/* subtypes of Text */
 	{	"plain",	PLAIN		},
 	{	"enriched",	ENRICHED	},
 	{	"html",		HTML		},
 	{	"richtext",	RICHTEXT	},
 		/* subtypes of Multipart */
 	{	"mixed",	MIXED		},
 	{	"alternative",	ALTERNATIVE	},
 	{	"digest",	DIGEST		},
 	{	"signed",	SIGNED		},
 	{	"parallel",	PARALLEL	},
 	{	"related",	RELATED		},
 	{	"report",	REPORT		},

 	{	"appledouble",	APPLEDOUBLE	},

 	{	"fax-message",	FAX		},

 	{	"encrypted",	ENCRYPTED	},

 	{	"x-bfile",	X_BFILE		},	/* BeOS */

 	{	"knowbot",		KNOWBOT		},	/* ??? */
 	{	"knowbot-metadata",	KNOWBOT		},	/* ??? */
 	{	"knowbot-code",		KNOWBOT		},	/* ??? */
 	{	"knowbot-state",	KNOWBOT		},	/* ??? */

 	{	NULL,		0		}
 };

 
 #ifdef	CL_THREAD_SAFE
 static	pthread_mutex_t	tables_mutex = PTHREAD_MUTEX_INITIALIZER;
 #endif

 #ifndef	O_BINARY
 #define	O_BINARY	0
 #endif
 

 #ifdef	NEW_WORLD

 #include "matcher.h"
 

 #undef	PARTIAL_DIR
 

 #if HAVE_MMAP
 #if HAVE_SYS_MMAN_H
 #include <sys/mman.h>
 #else /* HAVE_SYS_MMAN_H */
 #undef HAVE_MMAP
 #endif

 #else	/*HAVE_MMAP*/
 #undef	NEW_WORLD
 #endif

 #endif
 

 #ifdef	NEW_WORLD

 /*
  * Files larger than this are scanned with the old method, should be
  *	StreamMaxLength, I guess
  * If NW_MAX_FILE_SIZE is not defined, all files go through the
  *	new method. This definition is for machines very tight on RAM, or
  *	with large StreamMaxLength values
  */
 #define	MAX_ALLOCATION	134217728	/* see libclamav/others.c */
 #define	NW_MAX_FILE_SIZE	MAX_ALLOCATION
 

 struct scanlist {

 	const	char	*start;
 	size_t	size;
 	encoding_type	decoder;	/* only BASE64 and QUOTEDPRINTABLE for now */
 	struct	scanlist *next;

 };
 

 static struct map {
 	const	char	*offset;	/* sorted */
 	const	char	*word;
 	struct	map	*next;
 } *map, *tail;
 

 static	int	save_text(cli_ctx *ctx, const char *dir, const char *start, size_t len);

 static	void	create_map(const char *begin, const char *end);
 static	void	add_to_map(const char *offset, const char *word);
 static	const	char	*find_in_map(const char *offset, const char *word);
 static	void	free_map(void);
 

 /*
  * This could be the future. Instead of parsing and decoding it just decodes.

  *

  * USE IT AT YOUR PERIL, a large number of viruses are not detected with this
  * method, possibly because the decoded files must be exact and not have
  * extra data at the start or end, which this code will produce.

  *

  * Currently only supports base64 and quoted-printable
  *
  * You may also see a lot of warnings. For the moment it falls back to old
  *	world mode if it doesn't know what to do - that'll be removed.
  * The code is untidy...
  *
  * FIXME: Some mailbox scans are slower with this method. I suspect that it's
  * because the scan can proceed to the end of the file rather than the end
  * of the attachment which can mean than later emails are scanned many times

  *

  * FIXME: quoted printable doesn't know when to stop, so size related virus
  *	matching breaks
  *

  * TODO: Fall through to cli_parse_mbox() too often

  *

  * TODO: Add support for systems without mmap()

  *
  * TODO: partial_dir fall through

  *
  * FIXME: Some EICAR gets through

  */
 int

 cli_mbox(const char *dir, int desc, cli_ctx *ctx)

 {

 	char *start, *ptr, *line;
 	const char *last, *p, *q;

 	size_t size;

 	struct stat statb;
 	message *m;
 	fileblob *fb;

 	int ret = CL_CLEAN;

 	int wasAlloced;

 	struct scanlist *scanlist, *scanelem;

 	if(dir == NULL) {
 		cli_warnmsg("cli_mbox called with NULL dir\n");
 		return CL_ENULLARG;
 	}

 	if(fstat(desc, &statb) < 0)
 		return CL_EOPEN;
 
 	size = statb.st_size;
 
 	if(size == 0)
 		return CL_CLEAN;
 

 #ifdef	NW_MAX_FILE_SIZE
 	if(size > NW_MAX_FILE_SIZE)

 		return cli_parse_mbox(dir, desc, ctx);

 #endif

 	/*cli_warnmsg("NEW_WORLD is new code - use at your own risk.\n");*/

 #ifdef	PARTIAL_DIR
 	cli_warnmsg("PARTIAL_DIR doesn't work in the NEW_WORLD yet\n");
 #endif

 	start = mmap(NULL, size, PROT_READ, MAP_PRIVATE, desc, 0);
 	if(start == MAP_FAILED)

 		return CL_EMEM;
 
 	cli_dbgmsg("mmap'ed mbox\n");
 

 	ptr = cli_malloc(size);
 	if(ptr) {
 		memcpy(ptr, start, size);

 		munmap(start, size);

 		start = ptr;

 		wasAlloced = 1;

 	} else
 		wasAlloced = 0;
 

 	/* last points to the last *valid* address in the array */
 	last = &start[size - 1];
 
 	create_map(start, last);
 

 	scanelem = scanlist = NULL;
 	q = start;

 	/*
 	 * FIXME: mismatch of const char * and char * here and in later calls
 	 *	to find_in_map()
 	 */
 	while((p = find_in_map(q, "base64")) != NULL) {

 		cli_dbgmsg("Found base64\n");
 		if(scanelem) {
 			scanelem->next = cli_malloc(sizeof(struct scanlist));
 			scanelem = scanelem->next;
 		} else
 			scanlist = scanelem = cli_malloc(sizeof(struct scanlist));
 		scanelem->next = NULL;
 		scanelem->decoder = BASE64;
 		q = scanelem->start = &p[6];

 		if(((p = find_in_map(q, "\nFrom ")) != NULL) ||
 		   ((p = find_in_map(q, "base64")) != NULL) ||
 		   ((p = find_in_map(q, "quoted-printable")) != NULL)) {

 			scanelem->size = (size_t)(p - q);

 			q = p;

 		} else {
 			scanelem->size = (size_t)(last - scanelem->start) + 1;
 			break;
 		}

 		cli_dbgmsg("base64: last %u q %u\n", (unsigned int)last, (unsigned int)q);

 		assert(scanelem->size <= size);

 	}

 	q = start;

 	while((p = find_in_map(q, "quoted-printable")) != NULL) {

 		if(p != q)
 			switch(p[-1]) {
 				case ' ':
 				case ':':
 				case '=':	/* wrong but allow it */
 					break;
 				default:
 					q = &p[16];
 					cli_dbgmsg("Ignore quoted-printable false positive\n");
 					continue;	/* false positive */
 			}

 		cli_dbgmsg("Found quoted-printable\n");

 #ifdef	notdef
 		/*
 		 * The problem with quoted printable is recognising when to stop
 		 * parsing
 		 */

 		if(scanelem) {
 			scanelem->next = cli_malloc(sizeof(struct scanlist));
 			scanelem = scanelem->next;
 		} else
 			scanlist = scanelem = cli_malloc(sizeof(struct scanlist));
 		scanelem->next = NULL;
 		scanelem->decoder = QUOTEDPRINTABLE;
 		q = scanelem->start = &p[16];

 		cli_dbgmsg("qp: last %u q %u\n", (unsigned int)last, (unsigned int)q);

 		if(((p = find_in_map(q, "\nFrom ")) != NULL) ||
 		   ((p = find_in_map(q, "quoted-printable")) != NULL) ||
 		   ((p = find_in_map(q, "base64")) != NULL)) {

 			scanelem->size = (size_t)(p - q);

 			q = p;

 			cli_dbgmsg("qp: scanelem->size = %u\n", scanelem->size);
 		} else {
 			scanelem->size = (size_t)(last - scanelem->start) + 1;
 			break;
 		}

 		assert(scanelem->size <= size);

 #else
 		if(wasAlloced)
 			free(start);
 		else
 			munmap(start, size);
 

 		free_map();

 		return cli_parse_mbox(dir, desc, ctx);

 #endif

 	}
 

 	if(scanlist == NULL) {
 		const struct tableinit *tableinit;
 		bool anyHeadersFound = FALSE;

 		bool hasuuencode = FALSE;

 		cli_file_t type;

 
 		/* FIXME: message: There could of course be no decoder needed... */
 		for(tableinit = rfc821headers; tableinit->key; tableinit++)

 			if(find_in_map(start, tableinit->key)) {

 				anyHeadersFound = TRUE;
 				break;
 			}
 

 		if((!anyHeadersFound) &&
 		   ((p = find_in_map(start, "\nbegin ")) != NULL) &&
 		   (isuuencodebegin(++p)))

 			/* uuencoded part */
 			hasuuencode = TRUE;

 		else {
 			cli_dbgmsg("Nothing encoded, looking for a text part to save\n");
 			ret = save_text(ctx, dir, start, size);
 			if(wasAlloced)
 				free(start);
 			else
 				munmap(start, size);
 
 			free_map();
 			if(ret != CL_EFORMAT)
 				return ret;
 			ret = CL_CLEAN;
 		}

 		free_map();
 

 		type = cli_filetype(start, size);
 
 		if((type == CL_TYPE_UNKNOWN_TEXT) &&
 		   (strncmp(start, "Microsoft Mail Internet Headers", 31) == 0))

 			type = CL_TYPE_MAIL;

 		if(wasAlloced)
 			free(start);
 		else
 			munmap(start, size);

 		if(anyHeadersFound || hasuuencode) {
 			/* TODO: reduce the number of falls through here */

 			if(hasuuencode)

 				/* TODO: fast track visa */
 				cli_warnmsg("New world - fall back to old uudecoder\n");

 			else

 				cli_warnmsg("cli_mbox: unknown encoder, type %d\n", type);

 			if(type == CL_TYPE_MAIL)

 				return cli_parse_mbox(dir, desc, ctx);

 			cli_dbgmsg("Unknown filetype %d, return CLEAN\n", type);
 			return CL_CLEAN;

 		}

 #if	0	/* I don't believe this is needed any more */

 		/*
 		 * The message could be a plain text phish
 		 * FIXME: Can't get to the option whether we are looking for
 		 *	phishes or not, so assume we are, this slows things a
 		 *	lot
 		 * Should be
 		 *	if((type == CL_TYPE_MAIL) && (!(no-phishing))
 		 */
 		if(type == CL_TYPE_MAIL)

 			return cli_parse_mbox(dir, desc, ctx);

 #endif

 		cli_dbgmsg("cli_mbox: I believe it's plain text (type == %d) which must be clean\n",
 			type);

 		return CL_CLEAN;
 	}

 #if	0
 	if(wasAlloced) {
 		const char *max = NULL;
 
 		for(scanelem = scanlist; scanelem; scanelem = scanelem->next) {
 			const char *end = &scanelem->start[scanelem->size];
 
 			if(end > max)
 				max = end;
 		}
 
 		if(max < last)
 			printf("could free %d bytes\n", (int)(last - max));
 	}
 #endif

 
 	for(scanelem = scanlist; scanelem; scanelem = scanelem->next) {
 		if(scanelem->decoder == BASE64) {

 			const char *b64start = scanelem->start;
 			size_t b64size = scanelem->size;

 
 			cli_dbgmsg("b64size = %lu\n", b64size);

 			while((*b64start != '\n') && (*b64start != '\r')) {

 				b64start++;
 				b64size--;

 			}
 			/*
 			 * Look for the end of the headers
 			 */
 			while(b64start < last) {
 				if(*b64start == ';') {

 					b64start++;
 					b64size--;

 				} else if((memcmp(b64start, "\n\n", 2) == 0) ||
 					  (memcmp(b64start, "\r\r", 2) == 0)) {
 					b64start += 2;
 					b64size -= 2;
 					break;
 				} else if(memcmp(b64start, "\r\n\r\n", 4) == 0) {
 					b64start += 4;
 					b64size -= 4;
 					break;

 				} else if(memcmp(b64start, "\n \n", 3) == 0) {
 					/*
 					 * Some viruses are broken and have
 					 * one space character at the end of
 					 * the headers
 					 */
 					b64start += 3;
 					b64size -= 3;
 					break;
 				} else if(memcmp(b64start, "\r\n \r\n", 5) == 0) {
 					/*
 					 * Some viruses are broken and have
 					 * one space character at the end of
 					 * the headers
 					 */
 					b64start += 5;
 					b64size -= 5;
 					break;

 				}

 				b64start++;

 				b64size--;

 			}

 			if(b64size > 0L)

 				while((!isalnum(*b64start)) && (*b64start != '/')) {

 					if(b64size-- == 0L)
 						break;
 					b64start++;
 				}
 
 			if(b64size > 0L) {

 				int lastline;

 				char *tmpfilename;
 				unsigned char *uptr;
 

 				cli_dbgmsg("cli_mbox: decoding %ld base64 bytes\n", b64size);

 				if((fb = fileblobCreate()) == NULL) {

 					free_map();

 					if(wasAlloced)
 						free(start);
 					else
 						munmap(start, size);
 
 					return CL_EMEM;
 				}
 

 				tmpfilename = cli_gentemp(dir);

 				if(tmpfilename == NULL) {
 					free_map();

 					if(wasAlloced)
 						free(start);
 					else
 						munmap(start, size);

 					fileblobDestroy(fb);

 					return CL_EMEM;

 				}

 				fileblobSetFilename(fb, dir, tmpfilename);
 				free(tmpfilename);

 				line = NULL;

 				m = messageCreate();

 				if(m == NULL) {

 					free_map();

 					if(wasAlloced)
 						free(start);
 					else
 						munmap(start, size);

 					fileblobDestroy(fb);

 					return CL_EMEM;

 				}

 				messageSetEncoding(m, "base64");

 				messageSetCTX(m, ctx);
 				fileblobSetCTX(fb, ctx);
 

 				lastline = 0;

 				do {

 					int length = 0, datalen;

 					char *newline, *equal;

 					unsigned char *bigbuf, *data;
 					unsigned char smallbuf[1024];

 					const char *cptr;

 					/*printf("%ld: ", b64size); fflush(stdout);*/

 					for(cptr = b64start; b64size && (*cptr != '\n') && (*cptr != '\r'); cptr++) {

 						length++;
 						--b64size;
 					}

 					/*printf("%d: ", length); fflush(stdout);*/

 					newline = cli_realloc(line, length + 1);
 					if(newline == NULL)
 						break;
 					line = newline;

 					memcpy(line, b64start, length);
 					line[length] = '\0';

 					equal = strchr(line, '=');
 					if(equal) {
 						lastline++;
 						*equal = '\0';
 					}

 					/*puts(line);*/

 #if	0

 					if(messageAddStr(m, line) < 0)
 						break;

 #endif

 					if(length >= (int)sizeof(smallbuf)) {

 						datalen = length + 2;
 						data = bigbuf = cli_malloc(datalen);
 						if(data == NULL)
 							break;
 					} else {
 						bigbuf = NULL;
 						data = smallbuf;
 						datalen = sizeof(data) - 1;
 					}
 					uptr = decodeLine(m, BASE64, line, data, datalen);
 
 					if(uptr == NULL) {
 						if(bigbuf)
 							free(bigbuf);
 						break;
 					}
 					/*cli_dbgmsg("base64: write %u bytes\n", (size_t)(uptr - data));*/

 					datalen = fileblobAddData(fb, data, (size_t)(uptr - data));

 					if(bigbuf)
 						free(bigbuf);

 					if(datalen < 0)
 						break;

 					if(fileblobContainsVirus(fb))

 						break;

 					if((b64size > 0) && (*cptr == '\r')) {
 						b64start = ++cptr;

 						--b64size;
 					}

 					if((b64size > 0) && (*cptr == '\n')) {
 						b64start = ++cptr;

 						--b64size;
 					}

 					if(lastline)

 						break;

 				} while(b64size > 0L);
 

 				if(m->base64chars) {
 					unsigned char data[4];
 
 					uptr = base64Flush(m, data);
 					if(uptr) {
 						/*cli_dbgmsg("base64: flush %u bytes\n", (size_t)(uptr - data));*/

 						(void)fileblobAddData(fb, data, (size_t)(uptr - data));

 					}
 				}

 				if(fb)
 					fileblobDestroy(fb);
 				else

 					ret = -1;

 
 				messageDestroy(m);
 				free(line);

 			}

 		} else if(scanelem->decoder == QUOTEDPRINTABLE) {

 			const char *quotedstart = scanelem->start;
 			size_t quotedsize = scanelem->size;

 			cli_dbgmsg("quotedsize = %lu\n", quotedsize);
 			while(*quotedstart != '\n') {

 				quotedstart++;
 				quotedsize--;

 			}
 			/*
 			 * Look for the end of the headers
 			 */
 			while(quotedstart < last) {
 				if(*quotedstart == ';') {

 					quotedstart++;
 					quotedsize--;

 				} else if((*quotedstart == '\n') || (*quotedstart == '\r')) {

 					quotedstart++;
 					quotedsize--;
 					if((*quotedstart == '\n') || (*quotedstart == '\r')) {
 						quotedstart++;
 						quotedsize--;
 						break;
 					}

 				}

 				quotedstart++;
 				quotedsize--;

 			}

 			while(!isalnum(*quotedstart)) {
 				quotedstart++;
 				quotedsize--;
 			}

 			if(quotedsize > 0L) {
 				cli_dbgmsg("cli_mbox: decoding %ld quoted-printable bytes\n", quotedsize);

 				m = messageCreate();

 				if(m == NULL) {

 					free_map();

 					if(wasAlloced)
 						free(start);
 					else
 						munmap(start, size);
 

 					return CL_EMEM;

 				}

 				messageSetEncoding(m, "quoted-printable");

 				messageSetCTX(m, ctx);

 				line = NULL;

 				do {

 					int length = 0;

 					char *newline;

 					const char *cptr;

 					/*printf("%ld: ", quotedsize); fflush(stdout);*/

 					for(cptr = quotedstart; quotedsize && (*cptr != '\n') && (*cptr != '\r'); cptr++) {

 						length++;
 						--quotedsize;
 					}

 					/*printf("%d: ", length); fflush(stdout);*/

 					newline = cli_realloc(line, length + 1);
 					if(newline == NULL)
 						break;
 					line = newline;

 					memcpy(line, quotedstart, length);
 					line[length] = '\0';

 					/*puts(line);*/

 					if(messageAddStr(m, line) < 0)
 						break;

 					if((quotedsize > 0) && (*cptr == '\r')) {
 						quotedstart = ++cptr;

 						--quotedsize;
 					}

 					if((quotedsize > 0) && (*cptr == '\n')) {
 						quotedstart = ++cptr;

 						--quotedsize;
 					}

 				} while(quotedsize > 0L);
 

 				free(line);

 				fb = messageToFileblob(m, dir, 1);

 				messageDestroy(m);

 				if(fb)

 					fileblobDestroy(fb);

 				else
 					ret = -1;

 			}

 		}
 	}

 	scanelem = scanlist;
 

 	/*
 	 * There could be a phish in the plain text part, so save that
 	 * FIXME: Can't get to the option whether we are looking for
 	 *	phishes or not, so assume we are, this slows things a
 	 *	lot
 	 * Should be
 	 *	if((type == CL_TYPE_MAIL) && (!(no-phishing))
 	 */
 	ret = save_text(ctx, dir, start, size);
 
 	free_map();
 

 	while(scanelem) {
 		struct scanlist *n = scanelem->next;
 
 		free(scanelem);
 		scanelem = n;
 	}

 	if(wasAlloced)
 		free(start);
 	else
 		munmap(start, size);

 	/*
 	 * FIXME: Need to run cl_scandir() here and return that value
 	 */

 	cli_dbgmsg("cli_mbox: ret = %d\n", ret);

 	if(ret != CL_EFORMAT)
 		return ret;

 	cli_warnmsg("New world - don't know what to do - fall back to old world\n");

 	/* Fall back for now */

 	lseek(desc, 0L, SEEK_SET);

 	return cli_parse_mbox(dir, desc, ctx);

 }

 /*
  * Save a text part - it could contain phish or jscript
  */
 static int
 save_text(cli_ctx *ctx, const char *dir, const char *start, size_t len)
 {
 	const char *p;
 
 	if((p = find_in_map(start, "\n\n")) || (p = find_in_map(start, "\r\n\r\n"))) {
 		const char *q;
 		fileblob *fb;
 		char *tmpfilename;
 
 		if(((q = find_in_map(start, "base64")) == NULL) &&
 		   ((q = find_in_map(start, "quoted_printable")) == NULL)) {
 			cli_dbgmsg("It's all plain text!\n");
 			if(*p == '\r')
 				p += 4;
 			else
 				p += 2;
 			len -= (p - start);
 		} else if(((q = find_in_map(p, "\nFrom ")) == NULL) &&
 		   ((q = find_in_map(p, "base64")) == NULL) &&
 		   ((q = find_in_map(p, "quoted-printable")) == NULL))
 			cli_dbgmsg("Can't find end of plain text - assume it's all\n");
 		else
 			len = (size_t)(q - p);
 
 		if(len < 5) {
 			cli_dbgmsg("save_text: Too small\n");
 			return CL_EFORMAT;
 		}
 		if(ctx->scanned)
 			*ctx->scanned += len / CL_COUNT_PRECISION;
 
 		/*
 		 * This doesn't work, cli_scanbuff isn't designed to be used
 		 *	in this way. It gets the "filetype" wrong and then
 		 *	doesn't scan correctly
 		 */

 		if(cli_scanbuff((char *)p, len, ctx->virname, ctx->engine, CL_TYPE_UNKNOWN_DATA) == CL_VIRUS) {

 			cli_dbgmsg("save_text: found %s\n", *ctx->virname);
 			return CL_VIRUS;
 		}
 
 		fb = fileblobCreate();
 		if(fb == NULL)
 			return CL_EMEM;
 
 		tmpfilename = cli_gentemp(dir);
 
 		if(tmpfilename == NULL) {
 			fileblobDestroy(fb);
 			return CL_ETMPFILE;
 		}
 		cli_dbgmsg("save plain bit to %s, %u bytes\n",
 			tmpfilename, len);
 
 		fileblobSetFilename(fb, dir, tmpfilename);
 		free(tmpfilename);
 
 		(void)fileblobAddData(fb, (const unsigned char *)p, len);
 		fileblobDestroy(fb);
 		return CL_SUCCESS;
 	}
 	cli_dbgmsg("No text part found to save\n");
 	return CL_EFORMAT;
 }
 

 static void
 create_map(const char *begin, const char *end)
 {
 	const struct wordlist {
 		const char *word;
 		int len;
 	} wordlist[] = {
 		{	"base64",		6	},
 		{	"quoted-printable",	16	},
 		{	"\nbegin ",		7	},

 		{	"\nFrom ",		6	},
 		{	"\n\n",			2	},
 		{	"\r\n\r\n",		4	},

 		{	NULL,			0	}
 	};
 
 	if(map) {
 		cli_warnmsg("create_map called without free_map\n");
 		free_map();
 	}
 	while(begin < end) {
 		const struct wordlist *word;
 
 		for(word = wordlist; word->word; word++) {
 			if((end - begin) < word->len)
 				continue;
 			if(strncasecmp(begin, word->word, word->len) == 0) {
 				add_to_map(begin, word->word);
 				break;
 			}
 		}
 		begin++;
 	}
 }
 
 /* To sort map, assume 'offset' is presented in sorted order */
 static void
 add_to_map(const char *offset, const char *word)
 {
 	if(map) {
 		tail->next = cli_malloc(sizeof(struct map));	/* FIXME: verify */
 		tail = tail->next;
 	} else
 		map = tail = cli_malloc(sizeof(struct map));	/* FIXME: verify */
 
 	tail->offset = offset;
 	tail->word = word;
 	tail->next = NULL;
 }
 
 static const char *
 find_in_map(const char *offset, const char *word)
 {
 	const struct map *item;
 
 	for(item = map; item; item = item->next)
 		if(item->offset >= offset)
 			if(strcasecmp(word, item->word) == 0)
 				return item->offset;
 
 	return NULL;
 }
 
 static void
 free_map(void)
 {
 	while(map) {
 		struct map *next = map->next;
 
 		free(map);
 		map = next;
 	}
 	map = NULL;
 }
 
 #else	/*!NEW_WORLD*/

 int

 cli_mbox(const char *dir, int desc, cli_ctx *ctx)

 {

 	if(dir == NULL) {
 		cli_warnmsg("cli_mbox called with NULL dir\n");
 		return CL_ENULLARG;
 	}

 	return cli_parse_mbox(dir, desc, ctx);

 }
 #endif
 

 /*
  * TODO: when signal handling is added, need to remove temp files when a

  *	signal is received

  * TODO: add option to scan in memory not via temp files, perhaps with a

  * named pipe or memory mapped file, though this won't work on big e-mails
  * containing many levels of encapsulated messages - it'd just take too much
  * RAM

  * TODO: parse .msg format files

  * TODO: fully handle AppleDouble format, see

  *	http://www.lazerware.com/formats/Specs/AppleSingle_AppleDouble.pdf

  * TODO: ensure parseEmailHeaders is always called before parseEmailBody
  * TODO: create parseEmail which calls parseEmailHeaders then parseEmailBody

  * TODO: Handle unepected NUL bytes in header lines which stop strcmp()s:
  *	e.g. \0Content-Type: application/binary;

  */

 static int

 cli_parse_mbox(const char *dir, int desc, cli_ctx *ctx)

 {

 	int retcode, i;

 	message *body;

 	FILE *fd;

 	char buffer[RFC2821LENGTH + 1];

 	mbox_ctx mctx;

 #ifdef HAVE_BACKTRACE

 	void (*segv)(int);
 #endif

 	static table_t *rfc821, *subtype;

 #ifdef	CL_DEBUG
 	char tmpfilename[16];
 	int tmpfd;
 #endif

 #if	defined(FOLLOWURLS) && (!defined(CL_EXPERIMENTAL))

 	static int initialised = 0;
 #ifdef	CL_THREAD_SAFE
 	static pthread_mutex_t init_mutex = PTHREAD_MUTEX_INITIALIZER;
 #endif
 #endif

 #ifdef	NEW_WORLD
 	cli_dbgmsg("fall back to old world\n");
 #else

 	cli_dbgmsg("in mbox()\n");

 #endif

 #if	defined(FOLLOWURLS) && (!defined(CL_EXPERIMENTAL))

 	if(ctx->options&CL_SCAN_MAILURL) {
 #ifdef	CL_THREAD_SAFE
 		pthread_mutex_lock(&init_mutex);
 #endif
 		if(!initialised) {
 			if(curl_global_init(CURL_GLOBAL_ALL) != 0) {
 #ifdef	CL_THREAD_SAFE
 				pthread_mutex_unlock(&init_mutex);
 #endif
 				cli_warnmsg("curl_global_init failed, disabling mail-follow-urls");
 				ctx->options &= ~CL_SCAN_MAILURL;
 			}
 			initialised = 1;
 		}
 #ifdef	CL_THREAD_SAFE
 		pthread_mutex_unlock(&init_mutex);
 #endif
 	}
 #endif
 

 	i = dup(desc);
 	if((fd = fdopen(i, "rb")) == NULL) {
 		cli_errmsg("Can't open descriptor %d\n", desc);
 		close(i);

 		return CL_EOPEN;

 	}

 	rewind(fd);	/* bug 240 */

 #ifdef	CL_DEBUG
 	/*
 	 * Copy the incoming mail for debugging, so that if it falls over
 	 * we have a copy of the offending email. This is debugging code
 	 * that you shouldn't of course install in a live environment. I am
 	 * not interested in hearing about security issues with this section
 	 * of the parser.
 	 */
 	strcpy(tmpfilename, "/tmp/mboxXXXXXX");
 	tmpfd = mkstemp(tmpfilename);
 	if(tmpfd < 0) {
 		perror(tmpfilename);
 		cli_errmsg("Can't make debugging file\n");
 	} else {
 		FILE *tmpfp = fdopen(tmpfd, "w");
 
 		if(tmpfp) {
 			while(fgets(buffer, sizeof(buffer) - 1, fd) != NULL)
 				fputs(buffer, tmpfp);
 			fclose(tmpfp);
 			rewind(fd);
 		} else
 			cli_errmsg("Can't fdopen debugging file\n");
 	}
 #endif

 	if(fgets(buffer, sizeof(buffer) - 1, fd) == NULL) {

 		/* empty message */
 		fclose(fd);

 #ifdef	CL_DEBUG
 		unlink(tmpfilename);
 #endif

 		return CL_CLEAN;

 	}

 #ifdef	CL_THREAD_SAFE
 	pthread_mutex_lock(&tables_mutex);
 #endif

 	if(rfc821 == NULL) {
 		assert(subtype == NULL);

 		if(initialiseTables(&rfc821, &subtype) < 0) {
 			rfc821 = NULL;
 			subtype = NULL;

 #ifdef	CL_THREAD_SAFE
 			pthread_mutex_unlock(&tables_mutex);
 #endif

 			fclose(fd);

 #ifdef	CL_DEBUG
 			unlink(tmpfilename);
 #endif

 			return CL_EMEM;

 		}

 	}

 #ifdef	CL_THREAD_SAFE
 	pthread_mutex_unlock(&tables_mutex);
 #endif

 #ifdef HAVE_BACKTRACE

 	segv = signal(SIGSEGV, sigsegv);
 #endif
 

 	retcode = CL_SUCCESS;

 	body = NULL;
 

 	mctx.dir = dir;
 	mctx.rfc821Table = rfc821;
 	mctx.subtypeTable = subtype;
 	mctx.ctx = ctx;
 

 	/*

 	 * Is it a UNIX style mbox with more than one

 	 * mail message, or just a single mail message?

 	 *
 	 * TODO: It would be better if we called cli_scandir here rather than
 	 * in cli_scanmail. Then we could improve the way mailboxes with more
 	 * than one message is handled, e.g. stopping parsing when an infected
 	 * message is stopped, and giving a better indication of which message
 	 * within the mailbox is infected

 	 */

 	/*if((strncmp(buffer, "From ", 5) == 0) && isalnum(buffer[5])) {*/
 	if(strncmp(buffer, "From ", 5) == 0) {

 		/*

 		 * Have been asked to check a UNIX style mbox file, which
 		 * may contain more than one e-mail message to decode

 		 *
 		 * It would be far better for scanners.c to do this splitting
 		 * and do this
 		 *	FOR EACH mail in the mailbox
 		 *	DO
 		 *		pass this mail to cli_mbox --
 		 *		scan this file
 		 *		IF this file has a virus quit
 		 *		THEN
 		 *			return CL_VIRUS
 		 *		FI
 		 *	END
 		 * This would remove a problem with this code that it can
 		 * fill up the tmp directory before it starts scanning

 		 */

 		bool lastLineWasEmpty;
 		int messagenumber;
 		message *m = messageCreate();
 
 		if(m == NULL) {
 			fclose(fd);
 #ifdef HAVE_BACKTRACE
 			signal(SIGSEGV, segv);
 #endif

 #ifdef	CL_DEBUG
 			unlink(tmpfilename);
 #endif

 			return CL_EMEM;
 		}
 
 		lastLineWasEmpty = FALSE;
 		messagenumber = 1;

 		messageSetCTX(m, ctx);

 		do {

 			cli_chomp(buffer);

 			/*if(lastLineWasEmpty && (strncmp(buffer, "From ", 5) == 0) && isalnum(buffer[5])) {*/
 			if(lastLineWasEmpty && (strncmp(buffer, "From ", 5) == 0)) {

 				cli_dbgmsg("Deal with email number %d\n", messagenumber++);

 				/*

 				 * End of a message in the mail box

 				 */

 				body = parseEmailHeaders(m, rfc821);

 				if(body == NULL) {
 					messageReset(m);
 					continue;
 				}

 				messageSetCTX(body, ctx);

 				messageDestroy(m);

 				if(messageGetBody(body)) {

 					mbox_status rc = parseEmailBody(body, NULL, &mctx, 0);
 					if(rc == FAIL) {

 						messageReset(body);
 						m = body;
 						continue;

 					} else if(rc == VIRUS) {

 						cli_dbgmsg("Message number %d is infected\n",
 							messagenumber);
 						retcode = CL_VIRUS;

 						m = NULL;

 						break;

 					}

 				}

 				/*

 				 * Starting a new message, throw away all the

 				 * information about the old one. It would
 				 * be best to be able to scan this message
 				 * now, but cli_scanfile needs arguments
 				 * that haven't been passed here so it can't be
 				 * called

 				 */

 				m = body;
 				messageReset(body);

 				messageSetCTX(body, ctx);

 				cli_dbgmsg("Finished processing message\n");

 			} else

 				lastLineWasEmpty = (bool)(buffer[0] == '\0');

 			if(isuuencodebegin(buffer)) {

 				/*

 				 * Fast track visa to uudecode.
 				 * TODO: binhex, yenc
 				 */

 				if(uudecodeFile(m, buffer, dir, fd) < 0)

 					if(messageAddStr(m, buffer) < 0)
 						break;
 			} else

 				if(messageAddStr(m, buffer) < 0)
 					break;

 		} while(fgets(buffer, sizeof(buffer) - 1, fd) != NULL);

 		fclose(fd);
 

 		if(retcode == CL_SUCCESS) {
 			cli_dbgmsg("Extract attachments from email %d\n", messagenumber);
 			body = parseEmailHeaders(m, rfc821);
 		}
 		if(m)
 			messageDestroy(m);

 	} else {

 		/*
 		 * It's a single message, parse the headers then the body

 		 */

 		if(strncmp(buffer, "P I ", 4) == 0)
 			/*
 			 * CommuniGate Pro format: ignore headers until
 			 * blank line
 			 */

 			while((fgets(buffer, sizeof(buffer) - 1, fd) != NULL) &&

 				(strchr("\r\n", buffer[0]) == NULL))
 					;
 		/*
 		 * Ignore any blank lines at the top of the message
 		 */

 		while(strchr("\r\n", buffer[0]) &&

 		     (getline_from_mbox(buffer, sizeof(buffer) - 1, fd) != NULL))

 			;
 

 		buffer[sizeof(buffer) - 1] = '\0';

 		body = parseEmailFile(fd, rfc821, buffer, dir);

 		fclose(fd);

 	}

 	if(body) {
 		/*
 		 * Write out the last entry in the mailbox
 		 */

 		if((retcode == CL_SUCCESS) && messageGetBody(body)) {
 			messageSetCTX(body, ctx);

 			switch(parseEmailBody(body, NULL, &mctx, 0)) {

 				case FAIL:

 					retcode = CL_EFORMAT;
 					break;

 				case VIRUS:

 					retcode = CL_VIRUS;
 					break;
 			}
 		}

 		/*
 		 * Tidy up and quit
 		 */
 		messageDestroy(body);
 	}

 
 	cli_dbgmsg("cli_mbox returning %d\n", retcode);
 

 #ifdef HAVE_BACKTRACE

 	signal(SIGSEGV, segv);
 #endif
 

 #ifdef	CL_DEBUG
 	unlink(tmpfilename);
 #endif

 	return retcode;
 }
 
 /*

  * Read in an email message from fin, parse it, and return the message

  *

  * FIXME: files full of new lines and nothing else are
  * handled ungracefully...
  */
 static message *

 parseEmailFile(FILE *fin, const table_t *rfc821, const char *firstLine, const char *dir)

 {
 	bool inHeader = TRUE;

 	bool bodyIsEmpty = TRUE;

 	bool lastWasBlank = FALSE, lastBodyLineWasBlank = FALSE;

 	message *ret;
 	bool anyHeadersFound = FALSE;
 	int commandNumber = -1;

 	char *fullline = NULL, *boundary = NULL;

 	size_t fulllinelength = 0;

 	char buffer[RFC2821LENGTH + 1];

 
 	cli_dbgmsg("parseEmailFile\n");
 
 	ret = messageCreate();
 	if(ret == NULL)
 		return NULL;
 
 	strcpy(buffer, firstLine);
 	do {

 		const char *line;

 
 		(void)cli_chomp(buffer);
 

 		if(buffer[0] == '\0')

 			line = NULL;

 		else
 			line = buffer;

 
 		/*
 		 * Don't blank lines which are only spaces from headers,
 		 * otherwise they'll be treated as the end of header marker
 		 */

 		if(lastWasBlank) {
 			lastWasBlank = FALSE;
 			if(boundaryStart(buffer, boundary)) {
 				cli_dbgmsg("Found a header line with space that should be blank\n");
 				inHeader = FALSE;
 			}
 		}

 		if(inHeader) {

 			cli_dbgmsg("parseEmailFile: check '%s' fullline %p\n",
 				buffer ? buffer : "", fullline);

 			if(line && isspace(line[0])) {

 				char copy[sizeof(buffer)];
 
 				strcpy(copy, buffer);
 				strstrip(copy);
 				if(copy[0] == '\0') {
 					/*

 					 * The header line contains only white
 					 * space. This is not the end of the
 					 * headers according to RFC2822, but
 					 * some MUAs will handle it as though
 					 * it were, and virus writers exploit
 					 * this bug. We can't just break from
 					 * the loop here since that would allow
 					 * other exploits such as inserting a
 					 * white space line before the
 					 * content-type line. So we just have
 					 * to make a best guess. Sigh.

 					 */
 					if(fullline) {
 						if(parseEmailHeader(ret, fullline, rfc821) < 0)
 							continue;
 
 						free(fullline);
 						fullline = NULL;
 					}

 					if(boundary ||
 					   ((boundary = (char *)messageFindArgument(ret, "boundary")) != NULL)) {

 						lastWasBlank = TRUE;
 						continue;
 					}
 				}
 			}

 			if((line == NULL) && (fullline == NULL)) {	/* empty line */

 				/*
 				 * A blank line signifies the end of
 				 * the header and the start of the text
 				 */
 				if(!anyHeadersFound)
 					/* Ignore the junk at the top */
 					continue;

 				cli_dbgmsg("End of header information\n");
 				inHeader = FALSE;
 				bodyIsEmpty = TRUE;

 			} else {
 				char *ptr;

 				int lookahead;

 
 				if(fullline == NULL) {

 					char cmd[RFC2821LENGTH + 1], out[RFC2821LENGTH + 1];

 
 					/*
 					 * Continuation of line we're ignoring?
 					 */

 					if(isblank(line[0]))

 						continue;
 
 					/*
 					 * Is this a header we're interested in?
 					 */

 					if((strchr(line, ':') == NULL) ||
 					   (cli_strtokbuf(line, 0, ":", cmd) == NULL)) {
 						if(strncmp(line, "From ", 5) == 0)

 							anyHeadersFound = TRUE;
 						continue;
 					}
 

 					ptr = rfc822comments(cmd, out);

 					commandNumber = tableFind(rfc821, ptr ? ptr : cmd);
 
 					switch(commandNumber) {
 						case CONTENT_TRANSFER_ENCODING:
 						case CONTENT_DISPOSITION:
 						case CONTENT_TYPE:
 							anyHeadersFound = TRUE;
 							break;
 						default:
 							if(!anyHeadersFound)
 								anyHeadersFound = usefulHeader(commandNumber, cmd);
 							continue;
 					}

 					fullline = cli_strdup(line);

 					fulllinelength = strlen(line) + 1;
 				} else if(line != NULL) {
 					fulllinelength += strlen(line);

 					ptr = cli_realloc(fullline, fulllinelength);
 					if(ptr == NULL)
 						continue;
 					fullline = ptr;

 					strcat(fullline, line);

 				}
 
 				assert(fullline != NULL);
 
 				lookahead = getc(fin);
 				if(lookahead != EOF) {
 					ungetc(lookahead, fin);
 
 					/*
 					 * Section B.2 of RFC822 says TAB or
 					 * SPACE means a continuation of the
 					 * previous entry.
 					 *
 					 * Add all the arguments on the line
 					 */

 					if(isblank(lookahead))

 						continue;
 				}
 

 				/*
 				 * Handle broken headers, where the next
 				 * line isn't indented by whitespace
 				 */
 				if(fullline[fulllinelength - 2] == ';')
 					/* Add arguments to this line */
 					continue;
 

 				if(line && (count_quotes(fullline) & 1))
 					continue;

 				ptr = rfc822comments(fullline, NULL);

 				if(ptr) {
 					free(fullline);
 					fullline = ptr;
 				}
 
 				if(parseEmailHeader(ret, fullline, rfc821) < 0)
 					continue;
 
 				free(fullline);
 				fullline = NULL;
 			}

 		} else if(line && isuuencodebegin(line)) {

 			/*
 			 * Fast track visa to uudecode.
 			 * TODO: binhex, yenc
 			 */

 			bodyIsEmpty = FALSE;

 			if(uudecodeFile(ret, line, dir, fin) < 0)

 				if(messageAddStr(ret, line) < 0)
 					break;

 		} else {
 			if(line == NULL) {

 				/*
 				 * Although this would save time and RAM, some
 				 * phish signatures have been built which need
 				 * the blank lines
 				 */
 				if(lastBodyLineWasBlank &&
 				  (messageGetMimeType(ret) != TEXT)) {

 					cli_dbgmsg("Ignoring consecutive blank lines in the body\n");
 					continue;
 				}
 				lastBodyLineWasBlank = TRUE;

 			} else {
 				if(bodyIsEmpty) {
 					/*
 					 * Broken message: new line in the
 					 * middle of the headers, so the first
 					 * line of the body is in fact
 					 * the last lines of the header
 					 */

 					if(newline_in_header(line))

 						continue;

 					bodyIsEmpty = FALSE;

 				}

 				lastBodyLineWasBlank = FALSE;

 			}

 			if(messageAddStr(ret, line) < 0)

 				break;

 		}

 	} while(getline_from_mbox(buffer, sizeof(buffer) - 1, fin) != NULL);

 	if(boundary)
 		free(boundary);
 

 	if(fullline) {
 		if(*fullline) switch(commandNumber) {
 			case CONTENT_TRANSFER_ENCODING:
 			case CONTENT_DISPOSITION:
 			case CONTENT_TYPE:

 				cli_dbgmsg("parseEmailFile: Fullline unparsed '%s'\n", fullline);

 		}
 		free(fullline);
 	}
 
 	if(!anyHeadersFound) {
 		/*
 		 * False positive in believing we have an e-mail when we don't
 		 */
 		messageDestroy(ret);
 		cli_dbgmsg("parseEmailFile: no headers found, assuming it isn't an email\n");
 		return NULL;
 	}
 
 	messageClean(ret);
 
 	cli_dbgmsg("parseEmailFile: return\n");
 
 	return ret;
 }
 
 /*
  * The given message contains a raw e-mail.

  *
  * Returns the message's body with the correct arguments set

  *
  * The downside of this approach is that for a short time we have two copies
  * of the message in memory, the upside is that it makes for easier parsing
  * of encapsulated messages, and in the long run uses less memory in those
  * scenarios

  *
  * TODO: remove the duplication with parseEmailFile

  */

 static message *

 parseEmailHeaders(message *m, const table_t *rfc821)

 {

 	bool inHeader = TRUE;

 	bool bodyIsEmpty = TRUE;

 	const text *t;

 	message *ret;

 	bool anyHeadersFound = FALSE;

 	int commandNumber = -1;

 	char *fullline = NULL;

 	size_t fulllinelength = 0;

 	cli_dbgmsg("parseEmailHeaders\n");
 

 	if(m == NULL)
 		return NULL;
 
 	ret = messageCreate();

 	for(t = messageGetBody(m); t; t = t->t_next) {

 		const char *line;

 		if(t->t_line)

 			line = lineGetData(t->t_line);

 		else

 			line = NULL;

 		if(inHeader) {

 			cli_dbgmsg("parseEmailHeaders: check '%s'\n",

 				line ? line : "");
 			if(line == NULL) {

 				/*
 				 * A blank line signifies the end of
 				 * the header and the start of the text
 				 */
 				cli_dbgmsg("End of header information\n");

 				if(!anyHeadersFound) {
 					cli_dbgmsg("Nothing interesting in the header\n");
 					break;
 				}

 				inHeader = FALSE;
 				bodyIsEmpty = TRUE;

 			} else {

 				char *ptr;
 

 				if(fullline == NULL) {

 					char cmd[RFC2821LENGTH + 1];

 
 					/*
 					 * Continuation of line we're ignoring?
 					 */

 					if(isblank(line[0]))

 						continue;
 
 					/*
 					 * Is this a header we're interested in?
 					 */

 					if((strchr(line, ':') == NULL) ||
 					   (cli_strtokbuf(line, 0, ":", cmd) == NULL)) {
 						if(strncmp(line, "From ", 5) == 0)

 							anyHeadersFound = TRUE;

 						continue;

 					}

 					ptr = rfc822comments(cmd, NULL);

 					commandNumber = tableFind(rfc821, ptr ? ptr : cmd);
 					if(ptr)
 						free(ptr);

 
 					switch(commandNumber) {
 						case CONTENT_TRANSFER_ENCODING:
 						case CONTENT_DISPOSITION:
 						case CONTENT_TYPE:

 							anyHeadersFound = TRUE;

 							break;
 						default:

 							if(!anyHeadersFound)
 								anyHeadersFound = usefulHeader(commandNumber, cmd);

 							continue;
 					}

 					fullline = cli_strdup(line);
 					fulllinelength = strlen(line) + 1;
 				} else if(line) {
 					fulllinelength += strlen(line);

 					ptr = cli_realloc(fullline, fulllinelength);
 					if(ptr == NULL)
 						continue;
 					fullline = ptr;

 					strcat(fullline, line);

 				}

 				assert(fullline != NULL);

 				if(next_is_folded_header(t))
 					/* Add arguments to this line */
 					continue;

 				if(count_quotes(fullline) & 1)

 					continue;
 

 				ptr = rfc822comments(fullline, NULL);

 				if(ptr) {
 					free(fullline);
 					fullline = ptr;
 				}

 				if(parseEmailHeader(ret, fullline, rfc821) < 0)
 					continue;

 				free(fullline);
 				fullline = NULL;

 			}

 		} else {
 			if(bodyIsEmpty) {

 				if(line == NULL)

 					/* throw away leading blank lines */
 					continue;
 				/*
 				 * Broken message: new line in the
 				 * middle of the headers, so the first
 				 * line of the body is in fact
 				 * the last lines of the header
 				 */

 				if(newline_in_header(line))

 					continue;
 				bodyIsEmpty = FALSE;
 			}
 			/*if(t->t_line && isuuencodebegin(t->t_line))
 				puts("FIXME: add fast visa here");*/

 			/*cli_dbgmsg("Add line to body '%s'\n", line);*/

 			if(messageAddLine(ret, t->t_line) < 0)

 				break;

 		}

 	}

 	if(fullline) {

 		if(*fullline) switch(commandNumber) {
 			case CONTENT_TRANSFER_ENCODING:
 			case CONTENT_DISPOSITION:
 			case CONTENT_TYPE:

 				cli_dbgmsg("parseEmailHeaders: Fullline unparsed '%s'\n", fullline);

 		}

 		free(fullline);
 	}
 

 	if(!anyHeadersFound) {
 		/*
 		 * False positive in believing we have an e-mail when we don't
 		 */
 		messageDestroy(ret);
 		cli_dbgmsg("parseEmailHeaders: no headers found, assuming it isn't an email\n");
 		return NULL;
 	}
 

 	messageClean(ret);
 

 	cli_dbgmsg("parseEmailHeaders: return\n");
 

 	return ret;

 }
 
 /*

  * Handle a header line of an email message
  */
 static int

 parseEmailHeader(message *m, const char *line, const table_t *rfc821)

 {

 	char *cmd;

 	int ret = -1;
 #ifdef CL_THREAD_SAFE
 	char *strptr;
 #endif

 	const char *separater;

 	char *copy, tokenseparater[2];

 	cli_dbgmsg("parseEmailHeader '%s'\n", line);
 

 	/*
 	 * In RFC822 the separater between the key a value is a colon,
 	 * e.g.	Content-Transfer-Encoding: base64
 	 * However some MUA's are lapse about this and virus writers exploit
 	 * this hole, so we need to check all known possiblities
 	 */
 	for(separater = ":= "; *separater; separater++)
 		if(strchr(line, *separater) != NULL)
 			break;
 
 	if(*separater == '\0')

 		return -1;
 

 	copy = rfc2047(line);
 	if(copy == NULL)

 		/* an RFC checker would return -1 here */

 		copy = cli_strdup(line);

 	tokenseparater[0] = *separater;
 	tokenseparater[1] = '\0';
 

 #ifdef	CL_THREAD_SAFE

 	cmd = strtok_r(copy, tokenseparater, &strptr);

 #else
 	cmd = strtok(copy, tokenseparater);
 #endif

 	if(cmd && (strstrip(cmd) > 0)) {

 #ifdef	CL_THREAD_SAFE

 		char *arg = strtok_r(NULL, "", &strptr);

 #else
 		char *arg = strtok(NULL, "");
 #endif

 
 		if(arg)
 			/*
 			 * Found a header such as
 			 * Content-Type: multipart/mixed;
 			 * set arg to be
 			 * "multipart/mixed" and cmd to

 			 * be "Content-Type"

 			 */

 			ret = parseMimeHeader(m, cmd, rfc821, arg);

 	}

 	free(copy);

 	return ret;
 }
 
 /*

  * This is a recursive routine.

  * FIXME: We are not passed &mrec so we can't check against MAX_MAIL_RECURSION

  *

  * This function parses the body of mainMessage and saves its attachments in dir
  *

  * mainMessage is the buffer to be parsed, it contains an e-mail's body, without

  * any headers. First time of calling it'll be
  * the whole message. Later it'll be parts of a multipart message

  * textIn is the plain text message being built up so far
  */

 static mbox_status

 parseEmailBody(message *messageIn, text *textIn, mbox_ctx *mctx, unsigned int recursion_level)

 {

 	mbox_status rc;

 	text *aText = textIn;
 	message *mainMessage = messageIn;

 	fileblob *fb;

 	bool infected = FALSE;

 #ifdef CL_EXPERIMENTAL

 	const int doPhishingScan = mctx->ctx->engine->dboptions&CL_DB_PHISHING_URLS; /* || (mctx->ctx->options&CL_SCAN_PHISHING_GA_TRAIN) || (mctx->ctx->options&CL_SCAN_PHISHING_GA);  kept here for the GA MERGE */

 #endif

 	cli_dbgmsg("in parseEmailBody\n");

 	if(mctx->ctx->limits->maxmailrec) {
 		const cli_ctx *ctx = mctx->ctx;	/* needed for BLOCKMAX :-( */
 

 		/*
 		 * This is approximate
 		 */

 		if(recursion_level > ctx->limits->maxmailrec) {
 
 			cli_warnmsg("parseEmailBody: hit maximum recursion level (%u)\n", recursion_level);
 			if(BLOCKMAX) {
 				if(ctx->virname)
 					*ctx->virname = "MIME.RecursionLimit";
 				return VIRUS;
 			} else
 				return OK_ATTACHMENTS_NOT_SAVED;

 		}

 	}

 	rc = OK;
 

 	/* Anything left to be parsed? */

 	if(mainMessage && (messageGetBody(mainMessage) != NULL)) {

 		mime_type mimeType;

 		int subtype, inhead, htmltextPart, inMimeHead, i;

 		const char *mimeSubtype;
 		char *protocol, *boundary;

 		const text *t_line;

 		/*bool isAlternative;*/

 		message *aMessage;

 		int multiparts = 0;
 		message **messages = NULL;	/* parts of a multipart message */

 		cli_dbgmsg("Parsing mail file\n");
 

 		mimeType = messageGetMimeType(mainMessage);
 		mimeSubtype = messageGetMimeSubtype(mainMessage);
 

 		/* pre-process */

 		subtype = tableFind(mctx->subtypeTable, mimeSubtype);

 		if((mimeType == TEXT) && (subtype == PLAIN)) {

 			/*
 			 * This is effectively no encoding, notice that we
 			 * don't check that charset is us-ascii
 			 */
 			cli_dbgmsg("assume no encoding\n");
 			mimeType = NOMIME;

 			messageSetMimeSubtype(mainMessage, "");

 		} else if((mimeType == MESSAGE) &&
 			  (strcasecmp(mimeSubtype, "rfc822-headers") == 0)) {
 			/*
 			 * RFC1892/RFC3462: section 2 text/rfc822-headers
 			 * incorrectly sent as message/rfc822-headers

 			 *
 			 * Parse as text/plain, i.e. no mime

 			 */
 			cli_dbgmsg("Changing message/rfc822-headers to text/rfc822-headers\n");

 			mimeType = NOMIME;

 			messageSetMimeSubtype(mainMessage, "");

 		} else
 			cli_dbgmsg("mimeType = %d\n", mimeType);

 		switch(mimeType) {
 		case NOMIME:

 			cli_dbgmsg("Not a mime encoded message\n");

 			aText = textAddMessage(aText, mainMessage);

 #ifdef CL_EXPERIMENTAL

 			if(!doPhishingScan)
 				break;

 			/*
 			 * Fall through: some phishing mails claim they are
 			 * text/plain, when they are in fact html
 			 */

 #else
 			break;

 #endif

 		case TEXT:

 			/* text/plain has been preprocessed as no encoding */

 #ifdef CL_EXPERIMENTAL

 			if((subtype == HTML) || doPhishingScan) {

 #else

 			if((mctx->ctx->options&CL_SCAN_MAILURL) && (subtype == HTML))

 #endif

 				/*
 				 * It would be better to save and scan the
 				 * file and only checkURLs if it's found to be
 				 * clean
 				 */

 				checkURLs(mainMessage, mctx, &rc, (subtype == HTML));

 #ifdef CL_EXPERIMENTAL

 				/*
 				 * There might be html sent without subtype
 				 * html too, so scan them for phishing
 				 */

 				if(rc == VIRUS)

 					infected = TRUE;

 			}
 #endif

 			break;
 		case MULTIPART:

 			cli_dbgmsg("Content-type 'multipart' handler\n");

 			boundary = messageFindArgument(mainMessage, "boundary");
 
 			if(boundary == NULL) {

 				cli_warnmsg("Multipart/%s MIME message contains no boundary header\n",
 					mimeSubtype);

 				/* Broken e-mail message */
 				mimeType = NOMIME;
 				/*
 				 * The break means that we will still
 				 * check if the file contains a uuencoded file
 				 */
 				break;

 			}
 

 			/* Perhaps it should assume mixed? */

 			if(mimeSubtype[0] == '\0') {
 				cli_warnmsg("Multipart has no subtype assuming alternative\n");
 				mimeSubtype = "alternative";
 				messageSetMimeSubtype(mainMessage, "alternative");
 			}
 

 			/*
 			 * Get to the start of the first message
 			 */

 			t_line = messageGetBody(mainMessage);
 
 			if(t_line == NULL) {
 				cli_warnmsg("Multipart MIME message has no body\n");
 				free((char *)boundary);
 				mimeType = NOMIME;
 				break;
 			}
 
 			do

 				if(t_line->t_line) {
 					if(boundaryStart(lineGetData(t_line->t_line), boundary))
 						break;
 					/*

 					 * Found a binhex file before

 					 *	the first multipart

 					 * TODO: check yEnc

 					 */

 					if(binhexBegin(mainMessage) == t_line) {

 						if(exportBinhexMessage(mctx->dir, mainMessage)) {

 							/* virus found */

 							rc = VIRUS;

 							infected = TRUE;

 							break;

 						}

 					} else if(t_line->t_next &&

 						 (encodingLine(mainMessage) == t_line->t_next)) {

 						/*
 						 * We look for the next line
 						 * since later on we'll skip
 						 * over the important line when
 						 * we think it's a blank line
 						 * at the top of the message -
 						 * which it would have been in
 						 * an RFC compliant world
 						 */

 						cli_dbgmsg("Found MIME attachment before the first MIME section \"%s\"\n",
 							lineGetData(t_line->t_next->t_line));

 						if(messageGetEncoding(mainMessage) == NOENCODING)
 							break;

 					}

 				}

 			while((t_line = t_line->t_next) != NULL);

 
 			if(t_line == NULL) {

 				cli_dbgmsg("Multipart MIME message contains no boundary lines (%s)\n",
 					boundary);

 				/*
 				 * Free added by Thomas Lamy
 				 * <Thomas.Lamy@in-online.net>
 				 */
 				free((char *)boundary);

 				mimeType = NOMIME;
 				/*
 				 * The break means that we will still

 				 * check if the file contains a yEnc/binhex file

 				 */
 				break;

 			}
 			/*
 			 * Build up a table of all of the parts of this
 			 * multipart message. Remember, each part may itself
 			 * be a multipart message.
 			 */
 			inhead = 1;
 			inMimeHead = 0;
 

 			/*

 			 * Re-read this variable in case mimeSubtype has changed
 			 */
 			subtype = tableFind(mctx->subtypeTable, mimeSubtype);
 
 			/*

 			 * Parse the mainMessage object and create an array
 			 * of objects called messages, one for each of the

 			 * multiparts that mainMessage contains.

 			 *

 			 * This looks like parseEmailHeaders() - maybe there's
 			 * some duplication of code to be cleaned up

 			 *

 			 * We may need to create an array rather than just

 			 * save each part as it is found because not all
 			 * elements will need scanning, and we don't yet know
 			 * which of those elements it will be, except in
 			 * the case of mixed, when all parts need to be scanned.

 			 */

 			for(multiparts = 0; t_line && !infected; multiparts++) {

 				int lines = 0;

 				message **m;

 				m = cli_realloc(messages, ((multiparts + 1) * sizeof(message *)));

 				if(m == NULL)

 					break;
 				messages = m;

 				aMessage = messages[multiparts] = messageCreate();

 				if(aMessage == NULL) {
 					multiparts--;
 					continue;
 				}

 				messageSetCTX(aMessage, mctx->ctx);

 
 				cli_dbgmsg("Now read in part %d\n", multiparts);
 

 				/*
 				 * Ignore blank lines. There shouldn't be ANY
 				 * but some viruses insert them
 				 */

 				while((t_line = t_line->t_next) != NULL)

 					if(t_line->t_line &&
 					   /*(cli_chomp(t_line->t_text) > 0))*/
 					   (strlen(lineGetData(t_line->t_line)) > 0))

 						break;

 
 				if(t_line == NULL) {
 					cli_dbgmsg("Empty part\n");

 					/*
 					 * Remove this part unless there's

 					 * a binhex portion somewhere in

 					 * the complete message that we may
 					 * throw away by mistake if the MIME
 					 * encoding information is incorrect
 					 */

 					if(mainMessage &&
 					   (binhexBegin(mainMessage) == NULL)) {

 						messageDestroy(aMessage);
 						--multiparts;
 					}

 					continue;
 				}
 
 				do {

 					const char *line = lineGetData(t_line->t_line);

 					/*cli_dbgmsg("multipart %d: inMimeHead %d inhead %d boundary '%s' line '%s' next '%s'\n",
 						multiparts, inMimeHead, inhead, boundary, line,

 						t_line->t_next && t_line->t_next->t_line ? lineGetData(t_line->t_next->t_line) : "(null)");*/

 					if(inMimeHead) {	/* continuation line */

 						if(line == NULL) {

 							/*inhead =*/ inMimeHead = 0;

 							continue;
 						}

 						/*
 						 * Handle continuation lines
 						 * because the previous line

 						 * ended with a ; or this line
 						 * starts with a white space

 						 */

 						cli_dbgmsg("Multipart %d: About to add mime Argument '%s'\n",
 							multiparts, line);

 						/*
 						 * Handle the case when it
 						 * isn't really a continuation
 						 * line:
 						 * Content-Type: application/octet-stream;
 						 * Content-Transfer-Encoding: base64
 						 */

 						parseEmailHeader(aMessage, line, mctx->rfc821Table);

 						while(isspace((int)*line))
 							line++;
 
 						if(*line == '\0') {
 							inhead = inMimeHead = 0;
 							continue;
 						}

 						inMimeHead = FALSE;

 						messageAddArgument(aMessage, line);

 					} else if(inhead) {	/* handling normal headers */

 						/*int quotes;*/

 						char *fullline, *ptr;

 						if(line == NULL) {

 							/*
 							 * empty line, should the end of the headers,
 							 * but some base64 decoders, e.g. uudeview, are broken
 							 * and will handle this type of entry, decoding the
 							 * base64 content...
 							 * Content-Type: application/octet-stream; name=text.zip
 							 * Content-Transfer-Encoding: base64
 							 * Content-Disposition: attachment; filename="text.zip"

 							 *

 							 * Content-Disposition: attachment;
 							 *	filename=text.zip
 							 * Content-Type: application/octet-stream;
 							 *	name=text.zip
 							 * Content-Transfer-Encoding: base64

 							 *

 							 * UEsDBAoAAAAAAACgPjJ2RHw676gAAO+oAABEAAAAbWFpbF90ZXh0LWluZm8udHh0ICAgICAgICAg
 							 */

 							const text *next = t_line->t_next;
 

 							if(next && next->t_line) {
 								const char *data = lineGetData(next->t_line);

 
 								if((messageGetEncoding(aMessage) == NOENCODING) &&

 								   (messageGetMimeType(aMessage) == APPLICATION) &&
 								   strstr(data, "base64")) {

 									/*
 									 * Handle this nightmare (note the blank
 									 * line in the header and the incorrect
 									 * content-transfer-encoding header)
 									 *
 									 * Content-Type: application/octet-stream; name="zipped_files.EXEX-Spanska: Yes
 									 *
 									 * r-Encoding: base64
 									 * Content-Disposition: attachment; filename="zipped_files.EXE"
 									 */

 									messageSetEncoding(aMessage, "base64");
 									cli_dbgmsg("Ignoring fake end of headers\n");
 									continue;
 								}

 								if((strncmp(data, "Content", 7) == 0) ||
 								   (strncmp(data, "filename=", 9) == 0)) {

 									cli_dbgmsg("Ignoring fake end of headers\n");
 									continue;
 								}
 							}

 							cli_dbgmsg("Multipart %d: End of header information\n",
 								multiparts);

 							inhead = 0;
 							continue;
 						}

 						if(isspace((int)*line)) {
 							/*
 							 * The first line is
 							 * continuation line.
 							 * This is tricky
 							 * to handle, but
 							 * all we can do is our
 							 * best
 							 */
 							cli_dbgmsg("Part %d starts with a continuation line\n",
 								multiparts);
 							messageAddArgument(aMessage, line);
 							/*
 							 * Give it a default
 							 * MIME type since
 							 * that may be the
 							 * missing line
 							 *
 							 * Choose application to
 							 * force a save
 							 */
 							if(messageGetMimeType(aMessage) == NOMIME)
 								messageSetMimeType(aMessage, "application");
 							continue;
 						}
 

 						inMimeHead = FALSE;

 						assert(strlen(line) <= RFC2821LENGTH);

 						fullline = rfc822comments(line, NULL);

 						if(fullline == NULL)

 							fullline = cli_strdup(line);

 						/*quotes = count_quotes(fullline);*/

 						/*
 						 * Fold next lines to the end of this
 						 * if they start with a white space
 						 * or if this line has an odd number of quotes:
 						 * Content-Type: application/octet-stream; name="foo
 						 * "
 						 */

 						while(t_line && next_is_folded_header(t_line)) {
 							const char *data;
 
 							t_line = t_line->t_next;
 
 							data = lineGetData(t_line->t_line);

 							if(data[1] == '\0') {
 								/*
 								 * Broken message: the
 								 * blank line at the end
 								 * of the headers isn't blank -
 								 * it contains a space
 								 */
 								cli_dbgmsg("Multipart %d: headers not terminated by blank line\n",
 									multiparts);
 								inhead = FALSE;
 								break;
 							}
 

 							ptr = cli_realloc(fullline,
 								strlen(fullline) + strlen(data) + 1);

 							if(ptr == NULL)
 								break;

 							fullline = ptr;
 							strcat(fullline, data);

 							/*quotes = count_quotes(data);*/

 						}

 						cli_dbgmsg("Multipart %d: About to parse folded header '%s'\n",
 							multiparts, fullline);
 

 						parseEmailHeader(aMessage, fullline, mctx->rfc821Table);

 						free(fullline);

 					} else if(endOfMessage(line, boundary)) {
 						/*
 						 * Some viruses put information
 						 * *after* the end of message,
 						 * which presumably some broken
 						 * mail clients find, so we
 						 * can't assume that this
 						 * is the end of the message
 						 */
 						/* t_line = NULL;*/
 						break;

 					} else if(boundaryStart(line, boundary)) {
 						inhead = 1;
 						break;

 					} else {

 						if(messageAddLine(aMessage, t_line->t_line) < 0)

 							break;

 						lines++;
 					}

 				} while((t_line = t_line->t_next) != NULL);
 

 				cli_dbgmsg("Part %d has %d lines\n",
 					multiparts, lines);

 
 				/*
 				 * Only save in the array of messages if some
 				 * decision will be taken on whether to scan.
 				 * If all parts will be scanned then save to
 				 * file straight away
 				 */
 				switch(subtype) {
 					case MIXED:
 					case ALTERNATIVE:
 					case REPORT:
 					case DIGEST:
 					case APPLEDOUBLE:
 					case KNOWBOT:
 					case -1:
 						mainMessage = do_multipart(mainMessage,
 							messages, multiparts,
 							&rc, mctx, messageIn,

 							&aText, recursion_level);

 						--multiparts;

 						if(rc == VIRUS)

 							infected = TRUE;
 						break;
 					default:
 						messageClean(aMessage);
 				}

 			}
 
 			free((char *)boundary);
 

 			/*

 			 * Preprocess. Anything special to be done before
 			 * we handle the multiparts?

 			 */

 			switch(subtype) {

 				case KNOWBOT:
 					/* TODO */
 					cli_dbgmsg("multipart/knowbot parsed as multipart/mixed for now\n");
 					mimeSubtype = "mixed";
 					break;

 				case -1:
 					/*
 					 * According to section 7.2.6 of
 					 * RFC1521, unrecognised multiparts
 					 * should be treated as multipart/mixed.
 					 */

 					cli_dbgmsg("Unsupported multipart format `%s', parsed as mixed\n", mimeSubtype);

 					mimeSubtype = "mixed";
 					break;

 			}

 
 			/*

 			 * We've finished message we're parsing
 			 */
 			if(mainMessage && (mainMessage != messageIn)) {
 				messageDestroy(mainMessage);
 				mainMessage = NULL;

 			}

 			cli_dbgmsg("The message has %d parts\n", multiparts);
 
 			if(((multiparts == 0) || infected) && (aText == NULL)) {

 				if(messages) {
 					for(i = 0; i < multiparts; i++)
 						if(messages[i])
 							messageDestroy(messages[i]);

 					free(messages);

 				}
 

 				/*
 				 * FIXME: we could return 2 here when we have
 				 * saved stuff earlier

 				 *
 				 * Nothing to do

 				 */

 				return (rc == VIRUS) ? VIRUS : OK_ATTACHMENTS_NOT_SAVED;

 			}

 			cli_dbgmsg("Find out the multipart type (%s)\n", mimeSubtype);

 			/*
 			 * We now have all the parts of the multipart message
 			 * in the messages array:
 			 *	message *messages[multiparts]
 			 * Let's decide what to do with them all
 			 */

 			switch(tableFind(mctx->subtypeTable, mimeSubtype)) {

 			case RELATED:

 				cli_dbgmsg("Multipart related handler\n");

 				/*

 				 * Have a look to see if there's HTML code
 				 * which will need scanning

 				 */
 				aMessage = NULL;
 				assert(multiparts > 0);
 

 				htmltextPart = getTextPart(messages, multiparts);

 				if(htmltextPart >= 0)
 					aText = textAddMessage(aText, messages[htmltextPart]);

 				else
 					/*

 					 * There isn't an HTML bit. If there's a
 					 * multipart bit, it'll may be in there
 					 * somewhere

 					 */
 					for(i = 0; i < multiparts; i++)
 						if(messageGetMimeType(messages[i]) == MULTIPART) {
 							aMessage = messages[i];

 							htmltextPart = i;

 							break;
 						}
 

 				if(htmltextPart == -1)

 					cli_dbgmsg("No HTML code found to be scanned\n");

 				else {

 					rc = parseEmailBody(aMessage, aText, mctx, recursion_level + 1);

 					if(rc == OK) {

 						assert(aMessage == messages[htmltextPart]);
 						messageDestroy(aMessage);
 						messages[htmltextPart] = NULL;
 					}
 				}

 
 				/*
 				 * Fixed based on an idea from Stephen White <stephen@earth.li>
 				 * The message is confused about the difference
 				 * between alternative and related. Badtrans.B
 				 * suffers from this problem.
 				 *
 				 * Fall through in this case:
 				 * Content-Type: multipart/related;
 				 *	type="multipart/alternative"
 				 */

 				/*
 				 * Changed to always fall through based on
 				 * an idea from Michael Dankov <misha@btrc.ru>
 				 * that some viruses are completely confused
 				 * about the difference between related
 				 * and mixed
 				 */
 				/*cptr = messageFindArgument(mainMessage, "type");

 				if(cptr == NULL)
 					break;
 				isAlternative = (bool)(strcasecmp(cptr, "multipart/alternative") == 0);
 				free((char *)cptr);
 				if(!isAlternative)

 					break;*/

 			case DIGEST:
 				/*
 				 * According to section 5.1.5 RFC2046, the
 				 * default mime type of multipart/digest parts
 				 * is message/rfc822
 				 *
 				 * We consider them as alternative, wrong in
 				 * the strictest sense since they aren't
 				 * alternatives - all parts a valid - but it's
 				 * OK for our needs since it means each part
 				 * will be scanned
 				 */

 			case ALTERNATIVE:
 				cli_dbgmsg("Multipart alternative handler\n");
 
 				/*
 				 * Fall through - some clients are broken and
 				 * say alternative instead of mixed. The Klez

 				 * virus is broken that way, and anyway we
 				 * wish to scan all of the alternatives

 				 */
 			case REPORT:
 				/*
 				 * According to section 1 of RFC1892, the
 				 * syntax of multipart/report is the same
 				 * as multipart/mixed. There are some required
 				 * parameters, but there's no need for us to
 				 * verify that they exist
 				 */
 			case MIXED:

 			case APPLEDOUBLE:	/* not really supported */

 				/*
 				 * Look for attachments
 				 *
 				 * Not all formats are supported. If an
 				 * unsupported format turns out to be
 				 * common enough to implement, it is a simple
 				 * matter to add it
 				 */

 				if(aText) {
 					if(mainMessage && (mainMessage != messageIn))
 						messageDestroy(mainMessage);

 					mainMessage = NULL;

 				}

 
 				cli_dbgmsg("Mixed message with %d parts\n", multiparts);
 				for(i = 0; i < multiparts; i++) {

 					mainMessage = do_multipart(mainMessage,
 						messages, i, &rc, mctx,

 						messageIn, &aText, recursion_level + 1);

 					if(rc == VIRUS) {

 						infected = TRUE;
 						break;
 					}

 				}
 

 				/* rc = parseEmailBody(NULL, NULL, mctx, recursion_level + 1); */

 				break;
 			case SIGNED:
 			case PARALLEL:
 				/*
 				 * If we're here it could be because we have a
 				 * multipart/mixed message, consisting of a
 				 * message followed by an attachment. That
 				 * message itself is a multipart/alternative
 				 * message and we need to dig out the plain
 				 * text part of that alternative
 				 */

 				htmltextPart = getTextPart(messages, multiparts);
 				if(htmltextPart == -1)
 					htmltextPart = 0;

 				rc = parseEmailBody(messages[htmltextPart], aText, mctx, recursion_level + 1);

 				break;

 			case ENCRYPTED:

 				rc = FAIL;	/* Not yet handled */

 				protocol = (char *)messageFindArgument(mainMessage, "protocol");

 				if(protocol) {
 					if(strcasecmp(protocol, "application/pgp-encrypted") == 0) {
 						/* RFC2015 */
 						cli_warnmsg("PGP encoded attachment not scanned\n");

 						rc = OK_ATTACHMENTS_NOT_SAVED;

 					} else

 						cli_warnmsg("Unknown encryption protocol '%s' - if you believe this file contains a virus, submit it to www.clamav.net\n", protocol);

 					free(protocol);
 				} else

 					cli_dbgmsg("Encryption method missing protocol name\n");

 
 				break;

 			default:

 				assert(0);

 			}
 

 			if(mainMessage && (mainMessage != messageIn))
 				messageDestroy(mainMessage);
 

 			if(aText && (textIn == NULL)) {

 				if((!infected) && (fb = fileblobCreate()) != NULL) {

 					cli_dbgmsg("Save non mime and/or text/plain part\n");

 					fileblobSetFilename(fb, mctx->dir, "textpart");

 					/*fileblobAddData(fb, "Received: by clamd (textpart)\n", 30);*/

 					fileblobSetCTX(fb, mctx->ctx);

 					(void)textToFileblob(aText, fb, 1);

 
 					fileblobDestroy(fb);
 				}

 				textDestroy(aText);

 			}

 			for(i = 0; i < multiparts; i++)
 				if(messages[i])
 					messageDestroy(messages[i]);
 

 			if(messages)
 				free(messages);
 

 			return rc;
 
 		case MESSAGE:
 			/*
 			 * Check for forbidden encodings
 			 */
 			switch(messageGetEncoding(mainMessage)) {
 				case NOENCODING:
 				case EIGHTBIT:
 				case BINARY:
 					break;
 				default:

 					cli_warnmsg("MIME type 'message' cannot be decoded\n");

 					break;
 			}

 			rc = FAIL;

 			if((strcasecmp(mimeSubtype, "rfc822") == 0) ||
 			   (strcasecmp(mimeSubtype, "delivery-status") == 0)) {

 				message *m = parseEmailHeaders(mainMessage, mctx->rfc821Table);

 				if(m) {

 					cli_dbgmsg("Decode rfc822\n");

 					messageSetCTX(m, mctx->ctx);

 					if(mainMessage && (mainMessage != messageIn)) {
 						messageDestroy(mainMessage);
 						mainMessage = NULL;

 					} else
 						messageReset(mainMessage);

 					if(messageGetBody(m))

 						rc = parseEmailBody(m, NULL, mctx, recursion_level + 1);

 
 					messageDestroy(m);
 				}

 				break;

 			} else if(strcasecmp(mimeSubtype, "disposition-notification") == 0) {

 				/* RFC 2298 - handle like a normal email */

 				rc = OK;

 				break;

 			} else if(strcasecmp(mimeSubtype, "partial") == 0) {

 #ifdef	PARTIAL_DIR
 				/* RFC1341 message split over many emails */

 				if(rfc1341(mainMessage, mctx->dir) >= 0)

 					rc = OK;

 #else

 				cli_warnmsg("Partial message received from MUA/MTA - message cannot be scanned\n");

 #endif
 			} else if(strcasecmp(mimeSubtype, "external-body") == 0)

 				/* TODO */

 				cli_warnmsg("Attempt to send Content-type message/external-body trapped");

 			else

 				cli_warnmsg("Unsupported message format `%s' - if you believe this file contains a virus, submit it to www.clamav.net\n", mimeSubtype);

 			if(mainMessage && (mainMessage != messageIn))
 				messageDestroy(mainMessage);

 			if(messages)
 				free(messages);

 			return rc;

 
 		case APPLICATION:

 			/*cptr = messageGetMimeSubtype(mainMessage);

 			if((strcasecmp(cptr, "octet-stream") == 0) ||

 			   (strcasecmp(cptr, "x-msdownload") == 0)) {*/
 			{

 				fb = messageToFileblob(mainMessage, mctx->dir, 1);

 				if(fb) {
 					cli_dbgmsg("Saving main message as attachment\n");
 					fileblobDestroy(fb);

 					if(mainMessage != messageIn) {
 						messageDestroy(mainMessage);
 						mainMessage = NULL;
 					} else
 						messageReset(mainMessage);

 				}

 			} /*else
 				cli_warnmsg("Discarded application not sent as attachment\n");*/

 			break;
 
 		case AUDIO:
 		case VIDEO:
 		case IMAGE:
 			break;
 
 		default:
 			cli_warnmsg("Message received with unknown mime encoding");
 			break;
 		}

 		if(messages) {
 			/* "can't happen" */

 			cli_warnmsg("messages != NULL, report to http://bugs.clamav.net\n");

 			free(messages);

 		}

 	}
 

 	if(aText && (textIn == NULL)) {

 		/* Look for a bounce in the text (non mime encoded) portion */
 		const text *t;

 		for(t = aText; t; t = t->t_next) {
 			const line_t *l = t->t_line;

 			const text *lookahead, *topofbounce;

 			const char *s;

 			bool inheader;

 			if(l == NULL)
 				continue;
 

 			if(!isBounceStart(lineGetData(l)))

 				continue;
 
 			/*
 			 * We've found what looks like the start of a bounce
 			 * message. Only bother saving if it really is a bounce
 			 * message, this helps to speed up scanning of ping-pong
 			 * messages that have lots of bounces within bounces in
 			 * them
 			 */
 			for(lookahead = t->t_next; lookahead; lookahead = lookahead->t_next) {
 				l = lookahead->t_line;
 
 				if(l == NULL)
 					break;
 				s = lineGetData(l);
 				if(strncasecmp(s, "Content-Type:", 13) == 0)
 					/*
 					 * Don't bother with plain/text or
 					 * plain/html
 					 */
 					if(strstr(s, "text/") == NULL)

 						/*
 						 * Don't bother to save the unuseful
 						 * part
 						 */

 						break;
 			}
 
 			if(lookahead && (lookahead->t_line == NULL)) {
 				cli_dbgmsg("Non mime part bounce message is not mime encoded, so it will not be scanned\n");
 				t = lookahead;
 				/* look for next bounce message */
 				continue;
 			}
 

 			/*
 			 * Prescan the bounce message to see if there's likely
 			 * to be anything nasty.
 			 * This algorithm is hand crafted and may be breakable
 			 * so all submissions are welcome. It's best NOT to
 			 * remove this however you may be tempted, because it
 			 * significantly speeds up the scanning of multiple
 			 * bounces (i.e. bounces within many bounces)
 			 */
 			for(; lookahead; lookahead = lookahead->t_next) {
 				l = lookahead->t_line;
 
 				if(l) {
 					s = lineGetData(l);
 					if((strncasecmp(s, "Content-Type:", 13) == 0) &&
 					   (strstr(s, "multipart/") == NULL) &&
 					   (strstr(s, "message/rfc822") == NULL) &&
 					   (strstr(s, "text/plain") == NULL))
 						break;
 				}
 			}
 			if(lookahead == NULL) {

 				cli_dbgmsg("cli_mbox: I believe it's plain text which must be clean\n");

 				/* nothing here, move along please */
 				break;
 			}

 			if((fb = fileblobCreate()) == NULL)
 				break;
 			cli_dbgmsg("Save non mime part bounce message\n");

 			fileblobSetFilename(fb, mctx->dir, "bounce");

 			fileblobAddData(fb, (const unsigned char *)"Received: by clamd (bounce)\n", 28);

 			fileblobSetCTX(fb, mctx->ctx);

 
 			inheader = TRUE;
 			topofbounce = NULL;

 			do {

 				l = t->t_line;
 
 				if(l == NULL) {
 					if(inheader) {
 						inheader = FALSE;
 						topofbounce = t;
 					}
 				} else {
 					s = lineGetData(l);

 					fileblobAddData(fb, (const unsigned char *)s, strlen(s));

 				}

 				fileblobAddData(fb, (const unsigned char *)"\n", 1);

 				lookahead = t->t_next;
 				if(lookahead == NULL)
 					break;
 				t = lookahead;
 				l = t->t_line;
 				if((!inheader) && l) {
 					s = lineGetData(l);

 					if(isBounceStart(s)) {

 						cli_dbgmsg("Found the start of another bounce candidate (%s)\n", s);

 						break;
 					}
 				}

 			} while(!fileblobContainsVirus(fb));

 
 			fileblobDestroy(fb);
 			if(topofbounce)
 				t = topofbounce;
 			/*
 			 * Don't do this - it slows bugs.txt
 			 */
 			/*if(mainMessage)
 				mainMessage->bounce = NULL;*/

 		}

 		textDestroy(aText);
 		aText = NULL;
 	}
 

 	/*
 	 * No attachments - scan the text portions, often files
 	 * are hidden in HTML code
 	 */

 	if(mainMessage && (rc != VIRUS)) {

 		text *t_line;
 

 		/*

 		 * Look for uu-encoded main file

 		 */

 		if((encodingLine(mainMessage) != NULL) &&

 		   ((t_line = bounceBegin(mainMessage)) != NULL)) {
 			if(exportBounceMessage(t_line, mctx))

 				rc = OK;

 		} else {
 			bool saveIt;

 			if(messageGetMimeType(mainMessage) == MESSAGE)

 				/*

 				 * Quick peek, if the encapsulated
 				 * message has no
 				 * content encoding statement don't
 				 * bother saving to scan, it's safe

 				 */

 				saveIt = (bool)(encodingLine(mainMessage) != NULL);

 			else if((t_line = encodingLine(mainMessage)) != NULL) {

 				/*

 				 * Some bounces include the message
 				 * body without the headers.

 				 * FIXME: Unfortunately this generates a

 				 * lot of false positives that a bounce
 				 * has been found when it hasn't.

 				 */

 				if((fb = fileblobCreate()) != NULL) {

 					cli_dbgmsg("Found a bounce message with no header at '%s'\n",
 						lineGetData(t_line->t_line));

 					fileblobSetFilename(fb, mctx->dir, "bounce");

 					fileblobAddData(fb,
 						(const unsigned char *)"Received: by clamd (bounce)\n",
 						28);

 					/*fileblobSetCTX(fb, ctx);*/

 					fileblobDestroy(textToFileblob(t_line, fb, 1));

 				}

 				saveIt = FALSE;

 			} else

 				/*
 				 * Save the entire text portion,
 				 * since it it may be an HTML file with

 				 * a JavaScript virus or a phish

 				 */
 				saveIt = TRUE;

 			if(saveIt) {
 				cli_dbgmsg("Saving text part to scan\n");

 				saveTextPart(mainMessage, mctx->dir, 1);

 				if(mainMessage != messageIn) {
 					messageDestroy(mainMessage);
 					mainMessage = NULL;
 				} else
 					messageReset(mainMessage);

 				rc = OK;

 			}

 		}

 	} else

 		rc = OK_ATTACHMENTS_NOT_SAVED;	/* nothing saved */

 	if(mainMessage && (mainMessage != messageIn))
 		messageDestroy(mainMessage);
 

 	if((rc != FAIL) && infected)
 		rc = VIRUS;

 	cli_dbgmsg("parseEmailBody() returning %d\n", rc);

 	return rc;

 }
 
 /*
  * Is the current line the start of a new section?
  *
  * New sections start with --boundary
  */
 static int
 boundaryStart(const char *line, const char *boundary)
 {

 	const char *ptr;
 	char *out;

 	int rc;

 	char buf[RFC2821LENGTH + 1];

 	if(line == NULL)
 		return 0;	/* empty line */

 	if(boundary == NULL)
 		return 0;

 	/*cli_dbgmsg("boundaryStart: line = '%s' boundary = '%s'\n", line, boundary);*/

 	if((*line != '-') && (*line != '('))
 		return 0;
 
 	if(strchr(line, '-') == NULL)
 		return 0;
 

 	if(strlen(line) <= sizeof(buf)) {
 		out = NULL;
 		ptr = rfc822comments(line, buf);
 	} else

 		ptr = out = rfc822comments(line, NULL);

 	if(ptr == NULL)

 		ptr = line;

 
 	if(*ptr++ != '-') {

 		if(out)
 			free(out);

 		return 0;

 	}

 	/*

 	 * Gibe.B3 is broken, it has:

 	 *	boundary="---- =_NextPart_000_01C31177.9DC7C000"
 	 * but it's boundaries look like
 	 *	------ =_NextPart_000_01C31177.9DC7C000

 	 * notice the one too few '-'.
 	 * Presumably this is a deliberate exploitation of a bug in some mail
 	 * clients.
 	 *
 	 * The trouble is that this creates a lot of false positives for
 	 * boundary conditions, if we're too lax about matches. We do our level
 	 * best to avoid these false positives. For example if we have
 	 * boundary="1" we want to ensure that we don't break out of every line
 	 * that has -1 in it instead of starting --1. This needs some more work.

 	 *
 	 * Look with and without RFC822 comments stripped, I've seen some
 	 * samples where () are taken as comments in boundaries and some where
 	 * they're not. Irrespective of whatever RFC2822 says we need to find
 	 * viruses in both types of mails

 	 */

 	if((strstr(ptr, boundary) != NULL) || (strstr(line, boundary) != NULL))

 		rc = OK;

 	else if(*ptr++ != '-')

 		rc = FAIL;

 	else

 		rc = (strcasecmp(ptr, boundary) == 0);

 	if(out)
 		free(out);

 	if(rc == OK)

 		cli_dbgmsg("boundaryStart: found %s in %s\n", boundary, line);
 
 	return rc;

 }
 
 /*
  * Is the current line the end?
  *
  * The message ends with with --boundary--
  */
 static int
 endOfMessage(const char *line, const char *boundary)
 {
 	size_t len;
 

 	if(line == NULL)
 		return 0;

 	/*cli_dbgmsg("endOfMessage: line = '%s' boundary = '%s'\n", line, boundary);*/

 	if(*line++ != '-')
 		return 0;
 	if(*line++ != '-')
 		return 0;
 	len = strlen(boundary);

 	if(strncasecmp(line, boundary, len) != 0)
 		return 0;

 	/*
 	 * Use < rather than == because some broken mails have white
 	 * space after the boundary
 	 */

 	if(strlen(line) < (len + 2))

 		return 0;
 	line = &line[len];
 	if(*line++ != '-')
 		return 0;
 	return *line == '-';
 }
 
 /*
  * Initialise the various lookup tables
  */
 static int
 initialiseTables(table_t **rfc821Table, table_t **subtypeTable)
 {
 	const struct tableinit *tableinit;
 
 	/*
 	 * Initialise the various look up tables
 	 */
 	*rfc821Table = tableCreate();
 	assert(*rfc821Table != NULL);
 
 	for(tableinit = rfc821headers; tableinit->key; tableinit++)

 		if(tableInsert(*rfc821Table, tableinit->key, tableinit->value) < 0) {
 			tableDestroy(*rfc821Table);

 			*rfc821Table = NULL;

 			return -1;

 		}

 
 	*subtypeTable = tableCreate();
 	assert(*subtypeTable != NULL);
 
 	for(tableinit = mimeSubtypes; tableinit->key; tableinit++)
 		if(tableInsert(*subtypeTable, tableinit->key, tableinit->value) < 0) {
 			tableDestroy(*rfc821Table);

 			tableDestroy(*subtypeTable);

 			*rfc821Table = NULL;
 			*subtypeTable = NULL;

 			return -1;
 		}
 
 	return 0;
 }
 
 /*

  * If there's a HTML text version use that, otherwise

  * use the first text part, otherwise just use the

  * first one around. HTML text is most likely to include
  * a scripting worm

  *
  * If we can't find one, return -1
  */
 static int
 getTextPart(message *const messages[], size_t size)
 {
 	size_t i;

 	int textpart = -1;

 
 	for(i = 0; i < size; i++) {
 		assert(messages[i] != NULL);

 		if(messageGetMimeType(messages[i]) == TEXT) {
 			if(strcasecmp(messageGetMimeSubtype(messages[i]), "html") == 0)
 				return (int)i;
 			textpart = (int)i;
 		}

 	}

 	return textpart;

 }
 
 /*
  * strip -

  *	Remove the trailing spaces from a buffer. Don't call this directly,
  * always call strstrip() which is a wrapper to this routine to be used with
  * NUL terminated strings. This code looks a bit strange because of it's
  * heritage from code that worked on strings that weren't necessarily NUL
  * terminated.
  * TODO: rewrite for clamAV
  *

  * Returns it's new length (a la strlen)
  *
  * len must be int not size_t because of the >= 0 test, it is sizeof(buf)
  *	not strlen(buf)
  */
 static size_t
 strip(char *buf, int len)
 {
 	register char *ptr;
 	register size_t i;
 
 	if((buf == NULL) || (len <= 0))

 		return 0;

 
 	i = strlen(buf);
 	if(len > (int)(i + 1))

 		return i;

 	ptr = &buf[--len];
 

 #if	defined(UNIX) || defined(C_LINUX) || defined(C_DARWIN)	/* watch - it may be in shared text area */

 	do
 		if(*ptr)
 			*ptr = '\0';

 	while((--len >= 0) && (!isgraph(*--ptr)) && (*ptr != '\n') && (*ptr != '\r'));

 #else	/* more characters can be displayed on DOS */
 	do
 #ifndef	REAL_MODE_DOS
 		if(*ptr)	/* C8.0 puts into a text area */
 #endif
 			*ptr = '\0';
 	while((--len >= 0) && ((*--ptr == '\0') || (isspace((int)*ptr))));
 #endif
 	return((size_t)(len + 1));
 }
 
 /*
  * strstrip:
  *	Strip a given string
  */

 size_t

 strstrip(char *s)
 {
 	if(s == (char *)NULL)
 		return(0);

 	return(strip(s, (int)strlen(s) + 1));

 }
 
 static int
 parseMimeHeader(message *m, const char *cmd, const table_t *rfc821Table, const char *arg)
 {

 	char *copy, *p;
 	const char *ptr;

 	int commandNumber;

 	cli_dbgmsg("parseMimeHeader: cmd='%s', arg='%s'\n", cmd, arg);

 	copy = rfc822comments(cmd, NULL);

 	if(copy) {
 		commandNumber = tableFind(rfc821Table, copy);
 		free(copy);

 	} else
 		commandNumber = tableFind(rfc821Table, cmd);

 	copy = rfc822comments(arg, NULL);

 	if(copy)
 		ptr = copy;
 	else
 		ptr = arg;

 	switch(commandNumber) {

 		case CONTENT_TYPE:
 			/*
 			 * Fix for non RFC1521 compliant mailers
 			 * that send content-type: Text instead
 			 * of content-type: Text/Plain, or
 			 * just simply "Content-Type:"
 			 */

 			if(arg == NULL)

 				/*
 				 * According to section 4 of RFC1521:
 				 * "Note also that a subtype specification is
 				 * MANDATORY. There are no default subtypes"
 				 *

 				 * We have to break this and make an assumption

 				 * for the subtype because virus writers and
 				 * email client writers don't get it right
 				 */
 				 cli_warnmsg("Empty content-type received, no subtype specified, assuming text/plain; charset=us-ascii\n");

 			else if(strchr(ptr, '/') == NULL)

 				/*
 				 * Empty field, such as
 				 *	Content-Type:
 				 * which I believe is illegal according to
 				 * RFC1521
 				 */

 				cli_dbgmsg("Invalid content-type '%s' received, no subtype specified, assuming text/plain; charset=us-ascii\n", ptr);

 			else {

 				int i;

 				char *mimeArgs;	/* RHS of the ; */
 

 				/*
 				 * Some clients are broken and
 				 * put white space after the ;
 				 */

 				if(*arg == '/') {
 					cli_warnmsg("Content-type '/' received, assuming application/octet-stream\n");
 					messageSetMimeType(m, "application");
 					messageSetMimeSubtype(m, "octet-stream");
 				} else {
 					/*

 					 * The content type could be in quotes:
 					 *	Content-Type: "multipart/mixed"
 					 * FIXME: this is a hack in that ignores
 					 *	the quotes, it doesn't handle
 					 *	them properly

 					 */

 					while(isspace(*ptr))
 						ptr++;
 					if(ptr[0] == '\"')
 						ptr++;

 					if(ptr[0] != '/') {

 						char *s;
 						char *mimeType;	/* LHS of the ; */

 #ifdef CL_THREAD_SAFE

 						char *strptr = NULL;

 #endif

 						s = mimeType = cli_strtok(ptr, 0, ";");

 						/*

 						 * Handle
 						 * Content-Type: foo/bar multipart/mixed
 						 * and
 						 * Content-Type: multipart/mixed foo/bar

 						 */

 						if(s && *s) for(;;) {

 #ifdef	CL_THREAD_SAFE

 							int set = messageSetMimeType(m, strtok_r(s, "/", &strptr));

 #else
 							int set = messageSetMimeType(m, strtok(s, "/"));
 #endif

 
 							/*
 							 * Stephen White <stephen@earth.li>
 							 * Some clients put space after
 							 * the mime type but before
 							 * the ;
 							 */

 #ifdef	CL_THREAD_SAFE

 							s = strtok_r(NULL, ";", &strptr);

 #else
 							s = strtok(NULL, ";");
 #endif

 							if(s == NULL)
 								break;
 							if(set) {

 								size_t len = strstrip(s) - 1;

 								if(s[len] == '\"') {
 									s[len] = '\0';
 									len = strstrip(s);
 								}
 								if(len) {

 									if(strchr(s, ' ')) {
 										char *t = cli_strtok(s, 0, " ");

 										messageSetMimeSubtype(m, t);
 										free(t);
 									} else
 										messageSetMimeSubtype(m, s);

 								}

 							}

 
 							while(*s && !isspace(*s))
 								s++;
 							if(*s++ == '\0')
 								break;
 							if(*s == '\0')
 								break;

 						}

 						if(mimeType)
 							free(mimeType);

 					}

 				}

 
 				/*

 				 * Add in all rest of the the arguments.
 				 * e.g. if the header is this:
 				 * Content-Type:', arg='multipart/mixed; boundary=foo
 				 * we find the boundary argument set it

 				 */

 				i = 1;

 				while((mimeArgs = cli_strtok(ptr, i++, ";")) != NULL) {

 					cli_dbgmsg("mimeArgs = '%s'\n", mimeArgs);
 

 					messageAddArguments(m, mimeArgs);
 					free(mimeArgs);
 				}

 			}
 			break;
 		case CONTENT_TRANSFER_ENCODING:

 			messageSetEncoding(m, ptr);

 			break;
 		case CONTENT_DISPOSITION:

 			p = cli_strtok(ptr, 0, ";");
 			if(p) {
 				if(*p) {
 					messageSetDispositionType(m, p);
 					free(p);
 					p = cli_strtok(ptr, 1, ";");
 					messageAddArgument(m, p);
 				}
 				free(p);

 			}

 			if((p = (char *)messageFindArgument(m, "filename")) == NULL)
 				/*
 				 * Handle this type of header, without
 				 * a filename (e.g. some Worm.Torvil.D)
 				 *	Content-ID: <nRfkHdrKsAxRU>
 				 * Content-Transfer-Encoding: base64
 				 * Content-Disposition: attachment
 				 */
 				messageAddArgument(m, "filename=unknown");
 			else
 				free(p);

 	}

 	if(copy)
 		free(copy);

 	return 0;

 }
 

 /*

  * Save the text portion of the message
  */
 static void

 saveTextPart(message *m, const char *dir, int destroy_text)

 {

 	fileblob *fb;

 
 	messageAddArgument(m, "filename=textportion");

 	if((fb = messageToFileblob(m, dir, destroy_text)) != NULL) {

 		/*
 		 * Save main part to scan that
 		 */

 		cli_dbgmsg("Saving main message\n");

 		fileblobDestroy(fb);

 	}
 }
 

 /*

  * Handle RFC822 comments in headers.

  * If out == NULL, return a buffer without the comments, the caller must free
  *	the returned buffer
  * Return NULL on error or if the input * has no comments.

  * See secion 3.4.3 of RFC822

  * TODO: handle comments that go on to more than one line
  */
 static char *

 rfc822comments(const char *in, char *out)

 {
 	const char *iptr;

 	char *optr;

 	int backslash, inquote, commentlevel;
 
 	if(in == NULL)

 		return NULL;

 
 	if(strchr(in, '(') == NULL)

 		return NULL;

 	assert(out != in);
 
 	if(out == NULL) {
 		out = cli_malloc(strlen(in) + 1);
 		if(out == NULL)
 			return NULL;
 	}

 
 	backslash = commentlevel = inquote = 0;
 	optr = out;
 
 	cli_dbgmsg("rfc822comments: contains a comment\n");
 
 	for(iptr = in; *iptr; iptr++)
 		if(backslash) {

 			if(commentlevel == 0)
 				*optr++ = *iptr;

 			backslash = 0;
 		} else switch(*iptr) {
 			case '\\':
 				backslash = 1;
 				break;
 			case '\"':

 				*optr++ = '\"';

 				inquote = !inquote;
 				break;
 			case '(':

 				if(inquote)
 					*optr++ = '(';
 				else
 					commentlevel++;

 				break;
 			case ')':

 				if(inquote)
 					*optr++ = ')';
 				else if(commentlevel > 0)

 					commentlevel--;
 				break;
 			default:
 				if(commentlevel == 0)
 					*optr++ = *iptr;
 		}
 
 	if(backslash)	/* last character was a single backslash */
 		*optr++ = '\\';
 	*optr = '\0';
 

 	/*strstrip(out);*/

 
 	cli_dbgmsg("rfc822comments '%s'=>'%s'\n", in, out);
 
 	return out;
 }

 
 /*
  * Handle RFC2047 encoding. Returns a malloc'd buffer that the caller must
  * free, or NULL on error
  */
 static char *
 rfc2047(const char *in)
 {
 	char *out, *pout;
 	size_t len;
 

 	if((strstr(in, "=?") == NULL) || (strstr(in, "?=") == NULL))

 		return cli_strdup(in);

 
 	cli_dbgmsg("rfc2047 '%s'\n", in);
 	out = cli_malloc(strlen(in) + 1);
 
 	if(out == NULL)
 		return NULL;
 
 	pout = out;
 
 	/* For each RFC2047 string */
 	while(*in) {

 		char encoding, *ptr, *enctext;

 		message *m;
 		blob *b;
 
 		/* Find next RFC2047 string */
 		while(*in) {
 			if((*in == '=') && (in[1] == '?')) {
 				in += 2;
 				break;
 			}
 			*pout++ = *in++;
 		}
 		/* Skip over charset, find encoding */
 		while((*in != '?') && *in)
 			in++;
 		if(*in == '\0')
 			break;
 		encoding = *++in;
 		encoding = tolower(encoding);
 
 		if((encoding != 'q') && (encoding != 'b')) {

 			cli_warnmsg("Unsupported RFC2047 encoding type '%c' - if you believe this file contains a virus, submit it to www.clamav.net\n", encoding);

 			free(out);
 			out = NULL;

 			break;
 		}
 		/* Skip to encoded text */
 		if(*++in != '?')
 			break;
 		if(*++in == '\0')
 			break;
 

 		enctext = cli_strdup(in);

 		if(enctext == NULL) {
 			free(out);
 			out = NULL;
 			break;
 		}

 		in = strstr(in, "?=");

 		if(in == NULL) {
 			free(enctext);

 			break;

 		}

 		in += 2;
 		ptr = strstr(enctext, "?=");
 		assert(ptr != NULL);
 		*ptr = '\0';
 		/*cli_dbgmsg("Need to decode '%s' with method '%c'\n", enctext, encoding);*/
 
 		m = messageCreate();

 		if(m == NULL)

 			break;

 		messageAddStr(m, enctext);

 		free(enctext);

 		switch(encoding) {

 			case 'q':
 				messageSetEncoding(m, "quoted-printable");
 				break;
 			case 'b':
 				messageSetEncoding(m, "base64");
 				break;
 		}

 		b = messageToBlob(m, 1);

 		len = blobGetDataSize(b);

 		cli_dbgmsg("Decoded as '%*.*s'\n", (int)len, (int)len,
 			blobGetData(b));

 		memcpy(pout, blobGetData(b), len);
 		blobDestroy(b);
 		messageDestroy(m);
 		if(pout[len - 1] == '\n')
 			pout += len - 1;
 		else
 			pout += len;
 
 	}

 	if(out == NULL)
 		return NULL;
 
 	*pout = '\0';