/**

 * \file transact.c -- transaction primitives for the fetchmail driver loop

 *

 * Copyright 2001 by Eric S. Raymond

 * For license terms, see the file COPYING in this directory.

 */

#include  "config.h"

#include  <stdio.h>

#include  <string.h>

#include  <ctype.h>

#ifdef HAVE_MEMORY_H

#include  <memory.h>

#endif /* HAVE_MEMORY_H */

#if defined(STDC_HEADERS)

#include  <stdlib.h>

#endif

#if defined(HAVE_UNISTD_H)

#include <unistd.h>

#endif

#if defined(HAVE_STDARG_H)

#include  <stdarg.h>

#else

#include  <varargs.h>

#endif

#include <limits.h>

#include <assert.h>

#ifdef HAVE_NET_SOCKET_H

#include <net/socket.h>

#endif

#include <sys/socket.h>

#include <netdb.h>

#include "fm_md5.h"

#include "i18n.h"

#include "socket.h"

#include "fetchmail.h"

/** Macro to clamp the argument so it is >= INT_MIN. */

#define _FIX_INT_MIN(x) ((x) < INT_MIN ? INT_MIN : (x))

/** Macro to clamp the argument so it is <= INT_MAX. */

#define _FIX_INT_MAX(x) ((x) > INT_MAX ? INT_MAX : (x))

/** Macro to clamp the argument so it is representable as an int. */

#define CAST_TO_INT(x) ((int)(_FIX_INT_MIN(_FIX_INT_MAX(x))))

/** Macro to clamp the unsigned argument so it is representable as an int. */

#define UCAST_TO_INT(x) ((int)(_FIX_INT_MAX(x)))

/* global variables: please reinitialize them explicitly for proper

 * working in daemon mode */

/* session variables initialized in init_transact() */

int suppress_tags = FALSE;	/**< emit tags in the protocol? */

char tag[TAGLEN];		/**< buffer for the tag */

static int tagnum;		/**< local counter for the tag */

/** Macro to generate the tag and store it in #tag. */

#define GENSYM	(sprintf(tag, "A%04d", ++tagnum % TAGMOD), tag)

static const struct method *protocol; /**< description of the protocol used for the current poll */

char shroud[PASSWORDLEN*2+3];	/**< string to shroud in debug output */

/* session variables initialized in do_session() */

int mytimeout;		/**< value of nonreponse timeout */

/* mail variables initialized in readheaders() */

struct msgblk msgblk;   /**< stores attributes of the currently processed message */

static int accept_count /** count of accepted recipients */, reject_count /** count of rejected recipients */;

/** add given address to xmit_names if it exactly matches a full address

 * \returns nonzero if matched */

static int map_address(const char *addr,/**< address to match */

	struct query *ctl,		/**< contains list of aliases */

	struct idlist **xmit_names	/**< list of recipient names */)

{

    const char	*lname;

    lname = idpair_find(&ctl->localnames, addr);

    if (lname) {

	if (outlevel >= O_DEBUG)

	    report(stdout, GT_("mapped address %s to local %s\n"), addr, lname);

	save_str(xmit_names, lname, XMIT_ACCEPT);

	accept_count++;

    }

    return lname != NULL;

}

/** add given name to xmit_names if it matches declared localnames */

static void map_name(const char *name, struct query *ctl, struct idlist **xmit_names)

/** \param name		name to map */

/** \param ctl		list of permissible aliases */

/** \param xmit_names	list of recipient names parsed out */

{

    const char	*lname;

    lname = idpair_find(&ctl->localnames, name);

    if (!lname && ctl->wildcard)

	lname = name;

    if (lname != (char *)NULL)

    {

	if (outlevel >= O_DEBUG)

	    report(stdout, GT_("mapped %s to local %s\n"), name, lname);

	save_str(xmit_names, lname, XMIT_ACCEPT);

	accept_count++;

    }

}

static void find_server_names(const char *hdr,

			      struct query *ctl,

			      struct idlist **xmit_names)

/** parse names out of a RFC822 header into an ID list */

/** \param hdr		RFC822 header in question */

/** \param ctl		list of permissible aliases */

/** \param xmit_names	list of recipient names parsed out */

{

    if (hdr == (char *)NULL)

	return;

    else

    {

	char	*cp;

	for (cp = nxtaddr(hdr); cp != NULL; cp = nxtaddr(NULL))

	{

	    char	*atsign;

	    /* 

	     * Handle empty address from a To: header containing only 

	     * a comment.

	     */

	    if (!*cp)

		continue;

	    /*

	     * If the name of the user begins with a qmail virtual

	     * domain prefix, ignore the prefix.  Doing this here

	     * means qvirtual will work either with ordinary name

	     * mapping or with a localdomains option.

	     */

	    if (ctl->server.qvirtual)

	    {

		int sl = strlen(ctl->server.qvirtual);

		if (!strncasecmp((char *)cp, ctl->server.qvirtual, sl))

		    cp += sl;

	    }

	    if ((atsign = strchr((char *)cp, '@'))) {

		struct idlist	*idp;

		/* try to match full address first, this takes

		 * precedence over localdomains and alias mappings */

		if (map_address(cp, ctl, xmit_names))

		    goto nomap;

		/*

		 * Does a trailing segment of the hostname match something

		 * on the localdomains list?  If so, save the whole name

		 * and keep going.

		 */

		for (idp = ctl->server.localdomains; idp; idp = idp->next) {

		    char	*rhs;

		    rhs = atsign + (strlen(atsign) - strlen(idp->id));

		    if (rhs > atsign &&

			(rhs[-1] == '.' || rhs[-1] == '@') &&

			strcasecmp(rhs, idp->id) == 0)

		    {

			if (outlevel >= O_DEBUG)

			    report(stdout, GT_("passed through %s matching %s\n"), 

				  cp, idp->id);

			save_str(xmit_names, (const char *)cp, XMIT_ACCEPT);

			accept_count++;

			goto nomap;

		    }

		}

		/* if we matched a local domain, idp != NULL */

		if (!idp)

		{

		    /*

		     * Check to see if the right-hand part is an alias

		     * or MX equivalent of the mailserver.  If it's

		     * not, skip this name.  If it is, we'll keep

		     * going and try to find a mapping to a client name.

		     */

		    if (!is_host_alias(atsign+1, ctl, &ai0))

		    {

			save_str(xmit_names, cp, XMIT_REJECT);

			reject_count++;

			continue;

		    }

		}

		atsign[0] = '\0';

		map_name(cp, ctl, xmit_names);

	    nomap:;

	    }

	}

    }

}

/**

 * Return zero on a syntactically invalid address, nz on a valid one.

 *

 * This used to be strchr(a, '.'), but it turns out that lines like this

 *

 * Received: from punt-1.mail.demon.net by mailstore for markb@example.com

 *          id 938765929:10:27223:2; Fri, 01 Oct 99 08:18:49 GMT

 *

 * are not uncommon.  So now we just check that the following token is

 * not itself an email address.

 */

#define VALID_ADDRESS(a)	(!strchr((a), '@'))

/** write \a value into \a rbuf, indexed by \a tp, if there is

 * sufficient room left. */

#define RBUF_WRITE(value) do { if (tp < rbuf+sizeof(rbuf)-1) *tp++=(value); } while(0)

/** Try to extract real address from the Received line.

 * If a valid Received: line is found, we return the full address in

 * a buffer which can be parsed from nxtaddr().  This is to ensure that

 * the local domain part of the address can be passed along in 

 * find_server_names() if it contains one.

 * Note: We should return a dummy header containing the address 

 * which makes nxtaddr() behave correctly. 

 */

static char *parse_received(struct query *ctl, char *bufp)

{

    char *base, *ok = (char *)NULL;

    static char rbuf[HOSTLEN + USERNAMELEN + 4]; 

    struct addrinfo *ai0;

    /*

     * Try to extract the real envelope addressee.  We look here

     * specifically for the mailserver's Received line.

     * Note: this will only work for sendmail, or an MTA that

     * shares sendmail's convention for embedding the envelope

     * address in the Received line.  Sendmail itself only

     * does this when the mail has a single recipient.

     */

    if (outlevel >= O_DEBUG)

	report(stdout, GT_("analyzing Received line:\n%s"), bufp);

    /* search for whitepace-surrounded "by" followed by valid address */

    for (base = bufp;  ; base = ok + 2)

    {

	if (!(ok = strstr(base, "by")))

	    break;

	else if (!isspace((unsigned char)ok[-1]) || !isspace((unsigned char)ok[2]))

	    continue;

	else

	{

	    char	*sp, *tp;

	    /* extract space-delimited token after "by" */

	    for (sp = ok + 2; isspace((unsigned char)*sp); sp++)

		continue;

	    tp = rbuf;

	    for (; *sp && !isspace((unsigned char)*sp); sp++)

		RBUF_WRITE(*sp);

	    *tp = '\0';

	    /* look for valid address */

	    if (VALID_ADDRESS(rbuf))

		break;

	    else

		ok = sp - 1;	/* arrange to skip this token */

	}

    }

    if (ok)

    {

	/*

	 * If it's a DNS name of the mail server, look for the

	 * recipient name after a following "for".  Otherwise

	 * punt.

	 */

	if (is_host_alias(rbuf, ctl, &ai0))

	{

	    if (outlevel >= O_DEBUG)

		report(stdout, 

		      GT_("line accepted, %s is an alias of the mailserver\n"), rbuf);

	}

	else

	{

	    if (outlevel >= O_DEBUG)

		report(stdout, 

		      GT_("line rejected, %s is not an alias of the mailserver\n"), 

		      rbuf);

	    return(NULL);

	}

	/* search for whitepace-surrounded "for" followed by xxxx@yyyy */

	for (base = ok + 4 + strlen(rbuf);  ; base = ok + 2)

	{

	    if (!(ok = strstr(base, "for")))

		break;

	    else if (!isspace((unsigned char)ok[-1]) || !isspace((unsigned char)ok[3]))

		continue;

	    else

	    {

		char	*sp, *tp;

		/* extract space-delimited token after "for" */

		for (sp = ok + 3; isspace((unsigned char)*sp); sp++)

		    continue;

		tp = rbuf;

		for (; !isspace((unsigned char)*sp); sp++)

		    RBUF_WRITE(*sp);

		*tp = '\0';

		if (strchr(rbuf, '@'))

		    break;

		else

		    ok = sp - 1;	/* arrange to skip this token */

	    }

	}

	if (ok)

	{

	    flag	want_gt = FALSE;

	    char	*sp, *tp;

	    /* char after "for" could be space or a continuation newline */

	    for (sp = ok + 4; isspace((unsigned char)*sp); sp++)

		continue;

	    tp = rbuf;

	    RBUF_WRITE(':');	/* Here is the hack.  This is to be friends */

	    RBUF_WRITE(' ');	/* with nxtaddr()... */

	    if (*sp == '<')

	    {

		want_gt = TRUE;

		sp++;

	    }

	    while (*sp == '@')		/* skip routes */

		while (*sp && *sp++ != ':')

		    continue;

            while (*sp

                   && (want_gt ? (*sp != '>') : !isspace((unsigned char)*sp))

                   && *sp != ';')

		if (!isspace((unsigned char)*sp))

		{

		    RBUF_WRITE(*sp);

		    sp++;

		}    

		else

		{

		    /* uh oh -- whitespace here can't be right! */

		    ok = (char *)NULL;

		    break;

		}

	    RBUF_WRITE('\n');

	    *tp = '\0';

	    if (strlen(rbuf) <= 3)	/* apparently nothing has been found */

		ok = NULL;

	} else

	    ok = (char *)NULL;

    }

    if (!ok)

    {

	if (outlevel >= O_DEBUG)

	    report(stdout, GT_("no Received address found\n"));

	return(NULL);

    }

    else

    {

	if (outlevel >= O_DEBUG) {

	    char *lf = rbuf + strlen(rbuf)-1;

	    *lf = '\0';

	    if (outlevel >= O_DEBUG)

		report(stdout, GT_("found Received address `%s'\n"), rbuf+2);

	    *lf = '\n';

	}

	return(rbuf);

    }

}

/* shared by readheaders and readbody */

static int sizeticker; /**< internal state variable for print_ticker() */

/** Print ticker based on a amount of data transferred of \a bytes.

 * Increments \a *tickervar by \a bytes, and if it exceeds

 * \a SIZETICKER, print a dot and reduce *tickervar by \a SIZETICKER. */

static void print_ticker(int *tickervar, int bytes)

{

    *tickervar += bytes;

    while (*tickervar >= SIZETICKER)

    {

	if (want_progress())

	{

	    fputc('.', stdout);

	    fflush(stdout);

	}

	*tickervar -= SIZETICKER;

    }

}

/** Check if \a s is equal to a LF or CR LF sequence, followed by a NUL

 * byte. \todo FIXME merge this with end_of_header? */

#define EMPTYLINE(s)   (((s)[0] == '\r' && (s)[1] == '\n' && (s)[2] == '\0') \

                       || ((s)[0] == '\n' && (s)[1] == '\0'))

/** Check if \a s is an empty line. Accept "\r*\n" as EOH in order to be bulletproof against broken survers */

static int end_of_header (const char *s)

{

    while (s[0] == '\r')

	s++;

    return (s[0] == '\n' && s[1] == '\0');

}

/** read message headers and ship to SMTP or MDA */

int readheaders(int sock,

		       long fetchlen,

		       long reallen,

		       struct query *ctl,

		       int num,

		       flag *suppress_readbody)

/** \param sock		to which the server is connected */

/** \param fetchlen	length of message according to fetch response */

/** \param reallen	length of message according to getsizes */

/** \param ctl		query control record */

/** \param num		index of message */

/** \param suppress_readbody	output: whether call to readbody() should be supressed */

{

    struct addrblk

    {

	int		offset;

	struct addrblk	*next;

    };

    struct addrblk	*to_addrchain = NULL;

    struct addrblk	**to_chainptr = &to_addrchain;

    struct addrblk	*resent_to_addrchain = NULL;

    struct addrblk	**resent_to_chainptr = &resent_to_addrchain;

    char		buf[MSGBUFSIZE+1];

    int			from_offs, reply_to_offs, resent_from_offs;

    int			app_from_offs, sender_offs, resent_sender_offs;

    int			env_offs;

    char		*received_for, *rcv, *cp;

    static char		*delivered_to = NULL;

    int 		n, oldlen, ch, remaining, skipcount;

    size_t		linelen;

    int			delivered_to_count;

    struct idlist 	*idp;

    flag		no_local_matches = FALSE;

    flag		has_nuls;

    int			olderrs, good_addresses, bad_addresses;

    int			retain_mail = 0, refuse_mail = 0;

    flag		already_has_return_path = FALSE;

    sizeticker = 0;

    has_nuls = FALSE;

    msgblk.return_path[0] = '\0';

    olderrs = ctl->errcount;

    /* read message headers */

    msgblk.reallen = reallen;

    /*

     * We used to free the header block unconditionally at the end of 

     * readheaders, but it turns out that if close_sink() hits an error

     * condition the code for sending bouncemail will actually look

     * at the freed storage and coredump...

     */

    xfree(msgblk.headers);

    free_str_list(&msgblk.recipients);

    xfree(delivered_to);

    /* initially, no message digest */

    memset(ctl->digest, '\0', sizeof(ctl->digest));

    received_for = NULL;

    from_offs = reply_to_offs = resent_from_offs = app_from_offs = 

	sender_offs = resent_sender_offs = env_offs = -1;

    oldlen = 0;

    msgblk.msglen = 0;

    skipcount = 0;

    delivered_to_count = 0;

    ctl->mimemsg = 0;

    for (remaining = fetchlen; remaining > 0 || protocol->delimited; )

    {

	char *line, *rline;

	line = (char *)xmalloc(sizeof(buf));

	linelen = 0;

	line[0] = '\0';

	do {

	    do {

		char	*sp, *tp;

		set_timeout(mytimeout);

		if ((n = SockRead(sock, buf, sizeof(buf)-1)) == -1) {

		    set_timeout(0);

		    free(line);

		    return(PS_SOCKET);

		}

		set_timeout(0);

		/*

		 * Smash out any NULs, they could wreak havoc later on.

		 * Some network stacks seem to generate these at random,

		 * especially (according to reports) at the beginning of the

		 * first read.  NULs are illegal in RFC822 format.

		 */

		for (sp = tp = buf; sp < buf + n; sp++)

		    if (*sp)

			*tp++ = *sp;

		*tp = '\0';

		n = tp - buf;

	    } while

		  (n == 0);

	    remaining -= n;

	    linelen += n;

	    msgblk.msglen += n;

	    /*

	     * Try to gracefully handle the case where the length of a

	     * line exceeds MSGBUFSIZE.

	     */

	    if (n && buf[n-1] != '\n') 

	    {

		rline = (char *) realloc(line, linelen + 1);

		if (rline == NULL)

		{

		    free (line);

		    return(PS_IOERR);

		}

		line = rline;

		memcpy(line + linelen - n, buf, n);

		line[linelen] = '\0';

		ch = ' '; /* So the next iteration starts */

		continue;

	    }

	    /* lines may not be properly CRLF terminated; fix this for qmail */

	    /* we don't want to overflow the buffer here */

	    if (ctl->forcecr && buf[n-1]=='\n' && (n==1 || buf[n-2]!='\r'))

	    {

		char * tcp;

		rline = (char *) realloc(line, linelen + 2);

		if (rline == NULL)

		{

		    free (line);

		    return(PS_IOERR);

		}

		line = rline;

		memcpy(line + linelen - n, buf, n - 1);

		tcp = line + linelen - 1;

		*tcp++ = '\r';

		*tcp++ = '\n';

		*tcp = '\0';

		/* n++; - not used later on */

		linelen++;

	    }

	    else

	    {

		rline = (char *) realloc(line, linelen + 1);

		if (rline == NULL)

		{

		    free (line);

		    return(PS_IOERR);

		}

		line = rline;

		memcpy(line + linelen - n, buf, n + 1);

	    }

	    /* check for end of headers */

	    if (end_of_header(line))

	    {

eoh:

		if (linelen != strlen (line))

		    has_nuls = TRUE;

		free(line);

		goto process_headers;

	    }

	    /*

	     * Check for end of message immediately.  If one of your folders

	     * has been mangled, the delimiter may occur directly after the

	     * header.

	     */

	    if (protocol->delimited && line[0] == '.' && EMPTYLINE(line+1))

	    {

		if (suppress_readbody)

		    *suppress_readbody = TRUE;

		goto eoh; /* above */

	    }

	    /*

	     * At least one brain-dead website (netmind.com) is known to

	     * send out robotmail that's missing the RFC822 delimiter blank

	     * line before the body! Without this check fetchmail segfaults.

	     * With it, we treat such messages as spam and refuse them.

	     *

	     * Frederic Marchal reported in February 2006 that hotmail

	     * or something improperly wrapped a very long TO header

	     * (wrapped without inserting whitespace in the continuation

	     * line) and found that this code thus refused a message

	     * that should have been delivered.

	     *

	     * XXX FIXME: we should probably wrap the message up as

	     * message/rfc822 attachment and forward to postmaster (Rob

	     * MacGregor)

	     */

	    if (!refuse_mail

		&& !ctl->server.badheader == BHACCEPT

		&& !isspace((unsigned char)line[0])

		&& !strchr(line, ':'))

	    {

		if (linelen != strlen (line))

		    has_nuls = TRUE;

		if (outlevel > O_SILENT)

		    report(stdout,

			   GT_("incorrect header line found - see manpage for bad-header option\n"));

		if (outlevel >= O_VERBOSE)

		    report (stdout, GT_("line: %s"), line);

		refuse_mail = 1;

	    }

	    /* check for RFC822 continuations */

	    set_timeout(mytimeout);

	    ch = SockPeek(sock);

	    set_timeout(0);

	} while

	    (ch == ' ' || ch == '\t');	/* continuation to next line? */

	/* write the message size dots */

	if ((outlevel > O_SILENT && outlevel < O_VERBOSE) && linelen > 0)

	{

	    print_ticker(&sizeticker, linelen);

	}

	/*

	 * Decode MIME encoded headers. We MUST do this before

	 * looking at the Content-Type / Content-Transfer-Encoding

	 * headers (RFC 2046).

	 */

	if ( ctl->mimedecode )

	{

	    char *tcp;

	    UnMimeHeader(line);

	    /* the line is now shorter. So we retrace back till we find

	     * our terminating combination \n\0, we move backwards to

	     * make sure that we don't catch some \n\0 stored in the

	     * decoded part of the message */

	    for (tcp = line + linelen - 1; tcp > line && (*tcp != 0 || tcp[-1] != '\n'); tcp--) { }

	    if  (tcp > line) linelen = tcp - line;

	}

	/* skip processing if we are going to retain or refuse this mail */

	if (retain_mail || refuse_mail)

	{

	    free(line);

	    continue;

	}

	/* we see an ordinary (non-header, non-message-delimiter) line */

	if (linelen != strlen (line))

	    has_nuls = TRUE;

	/*

	 * The University of Washington IMAP server (the reference

	 * implementation of IMAP4 written by Mark Crispin) relies

	 * on being able to keep base-UID information in a special

	 * message at the head of the mailbox.  This message should

	 * neither be deleted nor forwarded.

	 *

	 * An example for such a message is (keep this in so people

	 * find it when looking where the special code is to handle the

	 * data):

	 *

	 *   From MAILER-DAEMON Wed Nov 23 11:38:42 2005

	 *   Date: 23 Nov 2005 11:38:42 +0100

	 *   From: Mail System Internal Data <MAILER-DAEMON@mail.example.org>

	 *   Subject: DON'T DELETE THIS MESSAGE -- FOLDER INTERNAL DATA

	 *   Message-ID: <1132742322@mail.example.org>

	 *   X-IMAP: 1132742306 0000000001

	 *   Status: RO

	 *

	 *   This text is part of the internal format of your mail folder, and is not

	 *   a real message.  It is created automatically by the mail system software.

	 *   If deleted, important folder data will be lost, and it will be re-created

	 *   with the data reset to initial values.

	 *

	 * This message is only visible if a POP3 server that is unaware

	 * of these UWIMAP messages is used besides UWIMAP or PINE.

	 *

	 * We will just check if the first message in the mailbox has an

	 * X-IMAP: header.

	 */

#ifdef POP2_ENABLE

	/*

	 * We disable this check under POP2 because there's no way to

	 * prevent deletion of the message.  So at least we ought to

	 * forward it to the user so he or she will have some clue

	 * that things have gone awry.

	 */

	if (servport("pop2") != servport(protocol->service))

#endif /* POP2_ENABLE */

	    if (num == 1 && !strncasecmp(line, "X-IMAP:", 7)) {

		free(line);

		retain_mail = 1;

		continue;

	    }

	/*

	 * This code prevents fetchmail from becoming an accessory after

	 * the fact to upstream sendmails with the `E' option on.  It also

	 * copes with certain brain-dead POP servers (like NT's) that pass

	 * through Unix from_ lines.

	 *

	 * Either of these bugs can result in a non-RFC822 line at the

	 * beginning of the headers.  If fetchmail just passes it

	 * through, the client listener may think the message has *no*

	 * headers (since the first) line it sees doesn't look

	 * RFC822-conformant) and fake up a set.

	 *

	 * What the user would see in this case is bogus (synthesized)

	 * headers, followed by a blank line, followed by the >From, 

	 * followed by the real headers, followed by a blank line,

	 * followed by text.

	 *

	 * We forestall this lossage by tossing anything that looks

	 * like an escaped or passed-through From_ line in headers.

	 * These aren't RFC822 so our conscience is clear...

	 */

	if (!strncasecmp(line, ">From ", 6) || !strncasecmp(line, "From ", 5))

	{

	    free(line);

	    continue;

	}

	/*

	 * We remove all Delivered-To: headers if dropdelivered is set

	 * - special care must be taken if Delivered-To: is also used

	 * as envelope at the same time.

	 *

	 * This is to avoid false mail loops errors when delivering

	 * local messages to and from a Postfix or qmail mailserver.

	 */

	if (ctl->dropdelivered && !strncasecmp(line, "Delivered-To:", 13)) 

	{

	    if (delivered_to ||

	    	ctl->server.envelope == STRING_DISABLED ||

		!ctl->server.envelope ||

		strcasecmp(ctl->server.envelope, "Delivered-To") ||

		delivered_to_count != ctl->server.envskip)

		free(line);

	    else 

		delivered_to = line;

	    delivered_to_count++;

	    continue;

	}

	/*

	 * If we see a Status line, it may have been inserted by an MUA

	 * on the mail host, or it may have been inserted by the server

	 * program after the headers in the transaction stream.  This

	 * can actually hose some new-mail notifiers such as xbuffy,

	 * which assumes any Status line came from a *local* MDA and

	 * therefore indicates that the message has been seen.

	 *

	 * Some buggy POP servers (including at least the 3.3(20)

	 * version of the one distributed with IMAP) insert empty

	 * Status lines in the transaction stream; we'll chuck those

	 * unconditionally.  Nonempty ones get chucked if the user

	 * turns on the dropstatus flag.

	 */

	{

	    char	*tcp;

	    if (!strncasecmp(line, "Status:", 7))

		tcp = line + 7;

	    else if (!strncasecmp(line, "X-Mozilla-Status:", 17))

		tcp = line + 17;

	    else

		tcp = NULL;

	    if (tcp) {

		while (*tcp && isspace((unsigned char)*tcp)) tcp++;

		if (!*tcp || ctl->dropstatus)

		{

		    free(line);

		    continue;

		}

	    }

	}

	if (ctl->rewrite)

	    line = reply_hack(line, ctl->server.truename, &linelen);

	/*

	 * OK, this is messy.  If we're forwarding by SMTP, it's the

	 * SMTP-receiver's job (according to RFC821, page 22, section

	 * 4.1.1) to generate a Return-Path line on final delivery.

	 * The trouble is, we've already got one because the

	 * mailserver's SMTP thought *it* was responsible for final

	 * delivery.

	 *

	 * Stash away the contents of Return-Path (as modified by reply_hack)

	 * for use in generating MAIL FROM later on, then prevent the header

	 * from being saved with the others.  In effect, we strip it off here.

	 *

	 * If the SMTP server conforms to the standards, and fetchmail gets the

	 * envelope sender from the Return-Path, the new Return-Path should be

	 * exactly the same as the original one.

	 *

	 * We do *not* want to ignore empty Return-Path headers.  These should

	 * be passed through as a way of indicating that a message should

	 * not trigger bounces if delivery fails.  What we *do* need to do is

	 * make sure we never try to rewrite such a blank Return-Path.  We

	 * handle this with a check for <> in the rewrite logic above.

	 *

	 * Also, if an email has multiple Return-Path: headers, we only

	 * read the first occurance, as some spam email has more than one

	 * Return-Path.

	 *

	 */

	if ((already_has_return_path==FALSE) && !strncasecmp("Return-Path:", line, 12) && (cp = nxtaddr(line)))

	{

	    char nulladdr[] = "<>";

	    already_has_return_path = TRUE;

	    if (cp[0]=='\0')	/* nxtaddr() strips the brackets... */

		cp=nulladdr;

	    strncpy(msgblk.return_path, cp, sizeof(msgblk.return_path));

	    msgblk.return_path[sizeof(msgblk.return_path)-1] = '\0';

	    if (!ctl->mda) {

		free(line);

		continue;

	    }

	}

	if (!msgblk.headers)

	{

	    oldlen = linelen;

	    msgblk.headers = (char *)xmalloc(oldlen + 1);

	    (void) memcpy(msgblk.headers, line, linelen);

	    msgblk.headers[oldlen] = '\0';

	    free(line);

	    line = msgblk.headers;

	}

	else

	{

	    char *newhdrs;

	    int	newlen;

	    newlen = oldlen + linelen;

	    newhdrs = (char *) realloc(msgblk.headers, newlen + 1);

	    if (newhdrs == NULL) {

		free(line);

		return(PS_IOERR);

	    }

	    msgblk.headers = newhdrs;

	    memcpy(msgblk.headers + oldlen, line, linelen);

	    msgblk.headers[newlen] = '\0';

	    free(line);

	    line = msgblk.headers + oldlen;

	    oldlen = newlen;

	}

	/* find offsets of various special headers */

	if (!strncasecmp("From:", line, 5))

	    from_offs = (line - msgblk.headers);

	else if (!strncasecmp("Reply-To:", line, 9))

	    reply_to_offs = (line - msgblk.headers);

	else if (!strncasecmp("Resent-From:", line, 12))

	    resent_from_offs = (line - msgblk.headers);

	else if (!strncasecmp("Apparently-From:", line, 16))

	    app_from_offs = (line - msgblk.headers);

	/*

	 * Netscape 4.7 puts "Sender: zap" in mail headers.  Perverse...

	 *

	 * But a literal reading of RFC822 sec. 4.4.2 supports the idea

	 * that Sender: *doesn't* have to be a working email address.

	 *

	 * The definition of the Sender header in RFC822 says, in

	 * part, "The Sender mailbox specification includes a word

	 * sequence which must correspond to a specific agent (i.e., a

	 * human user or a computer program) rather than a standard

	 * address."  That implies that the contents of the Sender

	 * field don't need to be a legal email address at all So

	 * ignore any Sender or Resent-Sender lines unless they

	 * contain @.

	 *

	 * (RFC2822 says the contents of Sender must be a valid mailbox

	 * address, which is also what RFC822 4.4.4 implies.)

	 */

	else if (!strncasecmp("Sender:", line, 7) && (strchr(line, '@') || strchr(line, '!')))

	    sender_offs = (line - msgblk.headers);

	else if (!strncasecmp("Resent-Sender:", line, 14) && (strchr(line, '@') || strchr(line, '!')))

	    resent_sender_offs = (line - msgblk.headers);

#ifdef __UNUSED__

 	else if (!strncasecmp("Message-Id:", line, 11))

	{

	    if (ctl->server.uidl)

 	    {

	        char id[IDLEN+1];

		line[IDLEN+12] = 0;		/* prevent stack overflow */

 		sscanf(line+12, "%s", id);

 	        if (!str_find( &ctl->newsaved, num))

		{

 		    struct idlist *newl = save_str(&ctl->newsaved,id,UID_SEEN);

		    newl->val.status.num = num;

		}

 	    }

 	}

#endif /* __UNUSED__ */

	/* if multidrop is on, gather addressee headers */

	if (MULTIDROP(ctl))

	{

	    if (!strncasecmp("To:", line, 3)

		|| !strncasecmp("Cc:", line, 3)

		|| !strncasecmp("Bcc:", line, 4)

		|| !strncasecmp("Apparently-To:", line, 14))

	    {

		*to_chainptr = (struct addrblk *)xmalloc(sizeof(struct addrblk));

		(*to_chainptr)->offset = (line - msgblk.headers);

		to_chainptr = &(*to_chainptr)->next; 

		*to_chainptr = NULL;

	    }

	    else if (!strncasecmp("Resent-To:", line, 10)

		     || !strncasecmp("Resent-Cc:", line, 10)

		     || !strncasecmp("Resent-Bcc:", line, 11))

	    {

		*resent_to_chainptr = (struct addrblk *)xmalloc(sizeof(struct addrblk));

		(*resent_to_chainptr)->offset = (line - msgblk.headers);

		resent_to_chainptr = &(*resent_to_chainptr)->next; 

		*resent_to_chainptr = NULL;

	    }

	    else if (ctl->server.envelope != STRING_DISABLED)

	    {

		if (ctl->server.envelope 

		    && strcasecmp(ctl->server.envelope, "Received"))

		{

		    if (env_offs == -1 && !strncasecmp(ctl->server.envelope,

						       line,

						       strlen(ctl->server.envelope)))

		    {				

			if (skipcount++ < ctl->server.envskip)

			    continue;

			env_offs = (line - msgblk.headers);

		    }    

		}

		else if (!received_for && !strncasecmp("Received:", line, 9))

		{

		    if (skipcount++ < ctl->server.envskip)

			continue;

		    received_for = parse_received(ctl, line);

		}

	    }

	}

    }

process_headers:

    if (retain_mail) {

	return(PS_RETAINED);

    }

    if (refuse_mail)

	return(PS_REFUSED);

    /*

     * This is the duplicate-message killer code.

     *

     * When mail delivered to a multidrop mailbox on the server is

     * addressed to multiple people on the client machine, there will

     * be one copy left in the box for each recipient.  This is not a

     * problem if we have the actual recipient address to dispatch on

     * (e.g. because we've mined it out of sendmail trace headers, or

     * a qmail Delivered-To line, or a declared sender envelope line).

     *

     * But if we're mining addressees out of the To/Cc/Bcc fields, and

     * if the mail is addressed to N people, each recipient will

     * get N copies.  This is bad when N > 1.

     *

     * Foil this by suppressing all but one copy of a message with a

     * given set of headers.

     *

     * Note: This implementation only catches runs of successive

     * messages with the same ID, but that should be good

     * enough. A more general implementation would have to store

     * ever-growing lists of seen message-IDs; in a long-running

     * daemon this would turn into a memory leak even if the 

     * implementation were perfect.

     * 

     * Don't mess with this code casually.  It would be way too easy

     * to break it in a way that blackholed mail.  Better to pass

     * the occasional duplicate than to do that...

     *

     * Matthias Andree:

     * The real fix however is to insist on Delivered-To: or similar

     * headers and require that one copy per recipient be dropped.

     * Everything else breaks sooner or later.

     */

    if (MULTIDROP(ctl) && msgblk.headers)

    {

	MD5_CTX context;

	MD5Init(&context);

	MD5Update(&context, (unsigned char *)msgblk.headers, strlen(msgblk.headers));

	MD5Final(ctl->digest, &context);

	if (!received_for && env_offs == -1 && !delivered_to)

	{

	    /*

	     * Hmmm...can MD5 ever yield all zeroes as a hash value?

	     * If so there is a one in 18-quadrillion chance this 

	     * code will incorrectly nuke the first message.

	     */

	    if (!memcmp(ctl->lastdigest, ctl->digest, DIGESTLEN))

		return(PS_REFUSED);

	}

	memcpy(ctl->lastdigest, ctl->digest, DIGESTLEN);

    }

    /*

     * Hack time.  If the first line of the message was blank, with no headers

     * (this happens occasionally due to bad gatewaying software) cons up

     * a set of fake headers.  

     *

     * If you modify the fake header template below, be sure you don't

     * make either From or To address @-less, otherwise the reply_hack

     * logic will do bad things.

     */

    if (msgblk.headers == (char *)NULL)

    {

	snprintf(buf, sizeof(buf),

		"From: FETCHMAIL-DAEMON\r\n"

		"To: %s@%s\r\n"

		"Subject: Headerless mail from %s's mailbox on %s\r\n",

		user, fetchmailhost, ctl->remotename, ctl->server.truename);

	msgblk.headers = xstrdup(buf);

    }

    /*

     * We can now process message headers before reading the text.

     * In fact we have to, as this will tell us where to forward to.

     */

    /* Check for MIME headers indicating possible 8-bit data */

    ctl->mimemsg = MimeBodyType(msgblk.headers, ctl->mimedecode);

#ifdef SDPS_ENABLE

    if (ctl->server.sdps && sdps_envfrom)

    {

	/* We have the real envelope return-path, stored out of band by

	 * SDPS - that's more accurate than any header is going to be.

	 */

	strlcpy(msgblk.return_path, sdps_envfrom, sizeof(msgblk.return_path));

	free(sdps_envfrom);

    } else

#endif /* SDPS_ENABLE */

    /*

     * If there is a Return-Path address on the message, this was

     * almost certainly the MAIL FROM address given the originating

     * sendmail.  This is the best thing to use for logging the

     * message origin (it sets up the right behavior for bounces and

     * mailing lists).  Otherwise, fall down to the next available 

     * envelope address (which is the most probable real sender).

     * *** The order is important! ***

     * This is especially useful when receiving mailing list

     * messages in multidrop mode.  if a local address doesn't

     * exist, the bounce message won't be returned blindly to the 

     * author or to the list itself but rather to the list manager

     * (ex: specified by "Sender:") which is much less annoying.  This 

     * is true for most mailing list packages.

     */

    if( !msgblk.return_path[0] ){

	char *ap = NULL;

	if (resent_sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_sender_offs)));

	else if (sender_offs >= 0 && (ap = nxtaddr(msgblk.headers + sender_offs)));

	else if (resent_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + resent_from_offs)));

	else if (from_offs >= 0 && (ap = nxtaddr(msgblk.headers + from_offs)));

	else if (reply_to_offs >= 0 && (ap = nxtaddr(msgblk.headers + reply_to_offs)));

	else if (app_from_offs >= 0 && (ap = nxtaddr(msgblk.headers + app_from_offs))) {}

	/* multi-line MAIL FROM addresses confuse SMTP terribly */

	if (ap && !strchr(ap, '\n')) {

	    strncpy(msgblk.return_path, ap, sizeof(msgblk.return_path));

	    msgblk.return_path[sizeof(msgblk.return_path)-1] = '\0';

	}

    }

    /* cons up a list of local recipients */

    msgblk.recipients = (struct idlist *)NULL;

    accept_count = reject_count = 0;

    /* is this a multidrop box? */

    if (MULTIDROP(ctl))

    {

#ifdef SDPS_ENABLE

	if (ctl->server.sdps && sdps_envto)

	{

	    /* We have the real envelope recipient, stored out of band by

	     * SDPS - that's more accurate than any header is going to be.

	     */

	    find_server_names(sdps_envto, ctl, &msgblk.recipients);

	    free(sdps_envto);

	} else

#endif /* SDPS_ENABLE */ 

	    if (env_offs > -1) {	    /* We have the actual envelope addressee */

		if (outlevel >= O_DEBUG) {

		    const char *tmps = msgblk.headers + env_offs;

		    size_t l = strcspn(tmps, "\r\n");

		    report(stdout, GT_("Parsing envelope \"%s\" names \"%-.*s\"\n"), ctl->server.envelope, UCAST_TO_INT(l), tmps);

		}

		find_server_names(msgblk.headers + env_offs, ctl, &msgblk.recipients);

	    }

	else if (delivered_to && ctl->server.envelope != STRING_DISABLED &&

		ctl->server.envelope && !strcasecmp(ctl->server.envelope, "Delivered-To"))

	{

	    if (outlevel >= O_DEBUG) {

		const char *tmps = delivered_to + 2 + strlen(ctl->server.envelope);

		size_t l = strcspn(tmps, "\r\n");

		report(stdout, GT_("Parsing envelope \"%s\" names \"%-.*s\"\n"), ctl->server.envelope, UCAST_TO_INT(l), tmps);

	    }

	    find_server_names(delivered_to, ctl, &msgblk.recipients);

	    xfree(delivered_to);

	} else if (received_for) {

	    /*

	     * We have the Received for addressee.  

	     * It has to be a mailserver address, or we

	     * wouldn't have got here.

	     * We use find_server_names() to let local 

	     * hostnames go through.

	     */

	    if (outlevel >= O_DEBUG) {

		const char *tmps = received_for + 2;

		size_t l = strcspn(tmps, "\r\n");

		report(stdout, GT_("Parsing Received names \"%-.*s\"\n"), UCAST_TO_INT(l), tmps);

	    }

	    find_server_names(received_for, ctl, &msgblk.recipients);

	} else {

	    /*

	     * We haven't extracted the envelope address.

	     * So check all the "Resent-To" header addresses if 

	     * they exist.  If and only if they don't, consider

	     * the "To" addresses.

	     */

	    register struct addrblk *nextptr;

	   if (outlevel >= O_DEBUG)

		   report(stdout, GT_("No envelope recipient found, resorting to header guessing.\n"));

	    if (resent_to_addrchain) {

		/* delete the "To" chain and substitute it 

		 * with the "Resent-To" list 

		 */

		while (to_addrchain) {

		    nextptr = to_addrchain->next;

		    free(to_addrchain);

		    to_addrchain = nextptr;

		}

		to_addrchain = resent_to_addrchain;

		resent_to_addrchain = NULL;

	    }

	    /* now look for remaining adresses */

	    while (to_addrchain) {

		if (outlevel >= O_DEBUG) {

		    const char *tmps = msgblk.headers+to_addrchain->offset;

		    size_t l = strcspn(tmps, "\r\n");

		    report(stdout, GT_("Guessing from header \"%-.*s\".\n"), UCAST_TO_INT(l), tmps);

		}

		find_server_names(msgblk.headers+to_addrchain->offset, ctl, &msgblk.recipients);

		nextptr = to_addrchain->next;

		free(to_addrchain);

		to_addrchain = nextptr;

	    }

	}

	if (!accept_count)

	{

	    no_local_matches = TRUE;

	    save_str(&msgblk.recipients, run.postmaster, XMIT_ACCEPT);

	    if (outlevel >= O_DEBUG)

		report(stdout,

		      GT_("no local matches, forwarding to %s\n"),

		      run.postmaster);

	}

    }

    else	/* it's a single-drop box, use first localname */

	save_str(&msgblk.recipients, ctl->localnames->id, XMIT_ACCEPT);

    /*

     * Time to either address the message or decide we can't deliver it yet.

     */

    if (ctl->errcount > olderrs)	/* there were DNS errors above */

    {

	if (outlevel >= O_DEBUG)

	    report(stdout,

		   GT_("forwarding and deletion suppressed due to DNS errors\n"));

	return(PS_TRANSIENT);

    }

    else

    {

	/* set up stuffline() so we can deliver the message body through it */ 

	if ((n = open_sink(ctl, &msgblk,

			   &good_addresses, &bad_addresses)) != PS_SUCCESS)

	{

	    return(n);

	}

    }

    n = 0;

    /*

     * Some server/sendmail combinations cause problems when our

     * synthetic Received line is before the From header.  Cope

     * with this...

     */

    if ((rcv = strstr(msgblk.headers, "Received:")) == (char *)NULL)

	rcv = msgblk.headers;

    /* handle ">Received:" lines too */

    while (rcv > msgblk.headers && rcv[-1] != '\n')

	rcv--;

    if (rcv > msgblk.headers)

    {

	char	c = *rcv;

	*rcv = '\0';

	n = stuffline(ctl, msgblk.headers);

	*rcv = c;

    }

    if (!run.invisible && n != -1)

    {

	/* utter any per-message Received information we need here */

        if (ctl->server.trueaddr) {

	    char saddr[50];

	    int e;

	    e = getnameinfo(ctl->server.trueaddr, ctl->server.trueaddr_len,

		    saddr, sizeof(saddr), NULL, 0,

		    NI_NUMERICHOST);

	    if (e)

		snprintf(saddr, sizeof(saddr), "(%-.*s)", (int)(sizeof(saddr) - 3), gai_strerror(e));

	    snprintf(buf, sizeof(buf),

		    "Received: from %s [%s]\r\n", 

		    ctl->server.truename, saddr);

	} else {

	    snprintf(buf, sizeof(buf),

		  "Received: from %s\r\n", ctl->server.truename);

	}

	n = stuffline(ctl, buf);

	if (n != -1)

	{

	    /*

	     * We SHOULD (RFC-2821 sec. 4.4/p. 53) make sure to only use

	     * IANA registered protocol names here.

	     */

	    snprintf(buf, sizeof(buf),

		    "\tby %s with %s (fetchmail-%s",

		    fetchmailhost,

		    protocol->name,

		    VERSION);

	    if (ctl->server.tracepolls)

	    {

		snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),

			" polling %s account %s",

			ctl->server.pollname,

			ctl->remotename);

		if (ctl->folder)

		    snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),

			    " folder %s",

			    ctl->folder);

	    }

	    snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), ")\r\n");

	    n = stuffline(ctl, buf);

	    if (n != -1)

	    {

		buf[0] = '\t';

		if (good_addresses == 0)

		{

		    snprintf(buf+1, sizeof(buf)-1, "for <%s> (by default); ",

			    rcpt_address (ctl, run.postmaster, 0));

		}

		else if (good_addresses == 1)

		{

		    for (idp = msgblk.recipients; idp; idp = idp->next)

			if (idp->val.status.mark == XMIT_ACCEPT)

			    break;	/* only report first address */

		    if (idp)

			snprintf(buf+1, sizeof(buf)-1,

				"for <%s>", rcpt_address (ctl, idp->id, 1));

		    snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf)-1,

			    " (%s); ",

			    MULTIDROP(ctl) ? "multi-drop" : "single-drop");

		}

		else

		    buf[1] = '\0';

		snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "%s\r\n",

			rfc822timestamp());

		n = stuffline(ctl, buf);

	    }

	}

    }

    if (n != -1)

	n = stuffline(ctl, rcv);	/* ship out rest of msgblk.headers */

    if (n == -1)

    {

	report(stdout, GT_("writing RFC822 msgblk.headers\n"));

	release_sink(ctl);

	return(PS_IOERR);

    }

    if (want_progress())

	fputc('#', stdout);

    /* write error notifications */

    if (no_local_matches || has_nuls || bad_addresses)

    {

	int	errlen = 0;

	char	errhd[USERNAMELEN + POPBUFSIZE], *errmsg;

	errmsg = errhd;

	strlcpy(errhd, "X-Fetchmail-Warning: ", sizeof(errhd));

	if (no_local_matches)

	{

	    if (reject_count != 1)

		strlcat(errhd, GT_("no recipient addresses matched declared local names"), sizeof(errhd));

	    else

	    {

		for (idp = msgblk.recipients; idp; idp = idp->next)

		    if (idp->val.status.mark == XMIT_REJECT)

			break;

		snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd),

			GT_("recipient address %s didn't match any local name"), idp->id);

	    }

	}

	if (has_nuls)

	{

	    if (errhd[sizeof("X-Fetchmail-Warning: ")])

		snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd), "; ");

	    snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd),

			GT_("message has embedded NULs"));

	}

	if (bad_addresses)

	{

	    if (errhd[sizeof("X-Fetchmail-Warning: ")])

		snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd), "; ");

	    snprintf(errhd+strlen(errhd), sizeof(errhd)-strlen(errhd),

			GT_("SMTP listener rejected local recipient addresses: "));

	    errlen = strlen(errhd);

	    for (idp = msgblk.recipients; idp; idp = idp->next)

		if (idp->val.status.mark == XMIT_RCPTBAD)

		    errlen += strlen(idp->id) + 2;

	    errmsg = (char *)xmalloc(errlen + 3);

	    strcpy(errmsg, errhd);

	    for (idp = msgblk.recipients; idp; idp = idp->next)

		if (idp->val.status.mark == XMIT_RCPTBAD)

		{

		    strcat(errmsg, idp->id);

		    if (idp->next)

			strcat(errmsg, ", ");

		}

	}

	strcat(errmsg, "\r\n");

	/* ship out the error line */

	stuffline(ctl, errmsg);

	if (errmsg != errhd)

	    free(errmsg);

    }

    /* issue the delimiter line */

    cp = buf;

    *cp++ = '\r';

    *cp++ = '\n';

    *cp = '\0';

    n = stuffline(ctl, buf);

    if ((size_t)n == strlen(buf))

	return PS_SUCCESS;

    else

	return PS_SOCKET;

}

int readbody(int sock, struct query *ctl, flag forward, int len)

/** read and dispose of a message body presented on \a sock */

/** \param ctl		query control record */

/** \param sock		to which the server is connected */

/** \param forward	TRUE to forward */

/** \param len		length of message */

{

    int	linelen;

    char buf[MSGBUFSIZE+4];

    char *inbufp = buf;

    flag issoftline = FALSE;

    /*

     * Pass through the text lines in the body.

     *

     * Yes, this wants to be ||, not &&.  The problem is that in the most

     * important delimited protocol, POP3, the length is not reliable.

     * As usual, the problem is Microsoft brain damage; see FAQ item S2.

     * So, for delimited protocols we need to ignore the length here and

     * instead drop out of the loop with a break statement when we see

     * the message delimiter.

     */

    while (protocol->delimited || len > 0)

    {

	set_timeout(mytimeout);

	/* XXX FIXME: for undelimited protocols that ship the size, such

	 * as IMAP, we might want to use the count of remaining characters

	 * instead of the buffer size -- not for fetchmail 6.3.X though */

	if ((linelen = SockRead(sock, inbufp, sizeof(buf)-4-(inbufp-buf)))==-1)

	{

	    set_timeout(0);

	    release_sink(ctl);

	    return(PS_SOCKET);

	}

	set_timeout(0);

	/* write the message size dots */

	if (linelen > 0)

	{

	    print_ticker(&sizeticker, linelen);

	}

	/* Mike Jones, Manchester University, 2006:

	 * "To fix IMAP MIME Messages in which fetchmail adds the remainder of

	 * the IMAP packet including the ')' character (part of the IMAP)

	 * Protocol causing the addition of an extra MIME boundary locally."

	 *

	 * However, we shouldn't do this for delimited protocols:

	 * many POP3 servers (Microsoft, qmail) goof up message sizes

	 * so we might end truncating messages prematurely.

	 */

	if (!protocol->delimited && linelen > len) {

	    /* FIXME: HACK ALERT! This \r\n is only here to make sure the

	     * \n\0 hunt works later on. The \n generated here was not

	     * part of the original message!

	     * The real fix will be to use buffer + length strings,

	     * rather than 0-terminated C strings. */

	    inbufp[len++] = '\r';

	    inbufp[len++] = '\n';

	    inbufp[len] = '\0';

	    linelen = len;

	}

	len -= linelen;

	/* check for end of message */

	if (protocol->delimited && *inbufp == '.')

	{

	    if (EMPTYLINE(inbufp+1))

		break;

	    else

		msgblk.msglen--;	/* subtract the size of the dot escape */

	}

	msgblk.msglen += linelen;

	if (ctl->mimedecode && (ctl->mimemsg & MSG_NEEDS_DECODE)) {

	    issoftline = UnMimeBodyline(&inbufp, protocol->delimited, issoftline);

	    if (issoftline && (sizeof(buf)-1-(inbufp-buf) < 200))

	    {

		/*

		 * Soft linebreak, but less than 200 bytes left in

		 * input buffer. Rather than doing a buffer overrun,

		 * ignore the soft linebreak, NL-terminate data and

		 * deliver what we have now.

		 * (Who writes lines longer than 2K anyway?)

		 */

		*inbufp = '\n'; *(inbufp+1) = '\0';

		issoftline = 0;

	    }

	}

	/* ship out the text line */

	if (forward && (!issoftline))

	{

	    int	n;

	    inbufp = buf;

	    /* guard against very long lines */

	    buf[MSGBUFSIZE+1] = '\r';

	    buf[MSGBUFSIZE+2] = '\n';

	    buf[MSGBUFSIZE+3] = '\0';

	    n = stuffline(ctl, buf);

	    if (n < 0)

	    {

		report(stdout, GT_("error writing message text\n"));

		release_sink(ctl);

		return(PS_IOERR);

	    }

	    else if (want_progress())

	    {

		fputc('*', stdout);

		fflush(stdout);

	    }

	}

    }

    return(PS_SUCCESS);

}

void init_transact(const struct method *proto)

/** initialize state for the send and receive functions */

{

    suppress_tags = FALSE;

    tagnum = 0;

    tag[0] = '\0';	/* nuke any tag hanging out from previous query */

    protocol = proto;

    shroud[0] = '\0';

}

/** shroud a password in the given buffer */

static void enshroud(char *buf)

{

    char *cp;

    if (shroud[0] && (cp = strstr(buf, shroud)))

    {

       char    *sp;

       sp = cp + strlen(shroud);

       *cp++ = '*';

       while (*sp)

           *cp++ = *sp++;

       *cp = '\0';

    }

}

#if defined(HAVE_STDARG_H)

/** assemble command in printf(3) style and send to the server */

void gen_send(int sock, const char *fmt, ... )

#else

void gen_send(sock, fmt, va_alist)

int sock;		/** socket to which server is connected */

const char *fmt;	/** printf-style format */

va_dcl

#endif

{

    char buf [MSGBUFSIZE+1];

    va_list ap;

    if (protocol->tagged && !suppress_tags)

        snprintf(buf, sizeof(buf) - 2, "%s ", GENSYM);

    else

	buf[0] = '\0';

#if defined(HAVE_STDARG_H)

    va_start(ap, fmt);

#else

    va_start(ap);

#endif

    vsnprintf(buf + strlen(buf), sizeof(buf)-2-strlen(buf), fmt, ap);

    va_end(ap);

    snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");

    SockWrite(sock, buf, strlen(buf));

    if (outlevel >= O_MONITOR)

    {

	enshroud(buf);

	buf[strlen(buf)-2] = '\0';

	report(stdout, "%s> %s\n", protocol->name, buf);

    }

}

/** get one line of input from the server */

int gen_recv(int sock  /** socket to which server is connected */,

	     char *buf /** buffer to receive input */,

	     int size  /** length of buffer */)

{

    size_t n;

    int oldphase = phase;	/* we don't have to be re-entrant */

    phase = SERVER_WAIT;

    set_timeout(mytimeout);

    if (SockRead(sock, buf, size) == -1)

    {

	set_timeout(0);

	phase = oldphase;

	if(is_idletimeout())

	{

	  resetidletimeout();