rz.c

ZMODEM协议的实现

#define VERSION "3.01 5-25-89"
#define PUBDIR "/usr/spool/uucppublic"

/*% cc -compat -M2 -Ox -K -i -DMD % -o rz; size rz;
<-xtx-*> cc386 -Ox -DMD rz.c -o $B/rz;  size $B/rz
 *
 * rz.c By Chuck Forsberg
 *
 *	cc -O rz.c -o rz		USG (3.0) Unix
 * 	cc -O -DV7  rz.c -o rz		Unix V7, BSD 2.8 - 4.3
 *
 *	ln rz rb;  ln rz rx			For either system
 *
 *	ln rz /usr/bin/rzrmail		For remote mail.  Make this the
 *					login shell. rzrmail then calls
 *					rmail(1) to deliver mail.
 *
 * To compile on VMS:
 *
 *	define LNK$LIBRARY   SYS$LIBRARY:VAXCRTL.OLB
 *	cc rz.c
 *	cc vvmodem.c
 *	link rz,vvmodem
 *	rz :== $disk:[username.subdir]rz.exe
 *      For high speed, try increasing the SYSGEN parameter TTY_TYPAHDSZ to 256.
 *
 *
 *  Unix is a trademark of Western Electric Company
 *
 * A program for Unix to receive files and commands from computers running
 *  Professional-YAM, PowerCom, YAM, IMP, or programs supporting XMODEM.
 *  rz uses Unix buffered input to reduce wasted CPU time.
 *
 *	This version implements ZMODEM Run Length Encoding 
 *	and variable length headers.  These features were not funded
 *	by the original Telenet development contract.  This software,
 *	including these features, may be freely used for non
 *	commercial and educational purposes.  This software may also
 *	be freely used to support file transfer operations to or from
 *	licensed Omen Technology products.  Contact Omen Technology
 *	for licensing for other uses.  Any programs which use part or
 *	all of this software must be provided in source form with this
 *	notice intact except by written permission from Omen
 *	Technology Incorporated.
 *
 *		Omen Technology Inc		FAX: [phone]
 *		Post Office Box 4681
 *		Portland OR 97208
 *
 *	Previous versions of this program (not containing the extensions
 *	listed above) remain in the public domain.
 *
 *	This code is made available in the hope it will be useful,
 *	BUT WITHOUT ANY WARRANTY OF ANY KIND OR LIABILITY FOR ANY
 *	DAMAGES OF ANY KIND.
 *
 *
 * Iff the program is invoked by rzCOMMAND, output is piped to 
 * "COMMAND filename"  (Unix only)
 *
 *  Some systems (Venix, Coherent, Regulus) may not support tty raw mode
 *  read(2) the same way as Unix. ONEREAD must be defined to force one
 *  character reads for these systems. Added 7-01-84 CAF
 *
 *  Alarm signal handling changed to work with 4.2 BSD 7-15-84 CAF 
 *
 *  BIX added 6-30-87 to support BIX(TM) upload protocol used by the
 *  Byte Information Exchange.
 *
 *  NFGVMIN Updated 2-18-87 CAF for Xenix systems where c_cc[VMIN]
 *  doesn't work properly (even though it compiles without error!),
 *
 *  SEGMENTS=n added 2-21-88 as a model for CP/M programs
 *    for CP/M-80 systems that cannot overlap modem and disk I/O.
 *
 *  VMS flavor hacks begin with rz version 2.00
 *
 *  -DMD may be added to compiler command line to compile in
 *    Directory-creating routines from Public Domain TAR by John Gilmore
 *
 *  HOWMANY may be tuned for best performance
 *
 *  USG UNIX (3.0) ioctl conventions courtesy  Jeff Martin
 */

#ifdef vax11c
#include <types.h>
#include <stat.h>
#define LOGFILE "rzlog.tmp"
#include <stdio.h>
#include <signal.h>
#include <setjmp.h>
#include <ctype.h>
#include <errno.h>
#define OS "VMS"
#define BUFREAD
extern int errno;
#define SS_NORMAL SS$_NORMAL

#ifndef PROGNAME
#define PROGNAME "rz"
#endif


#else


#define SS_NORMAL 0
#define LOGFILE "/tmp/rzlog"
#include <stdio.h>
#include <signal.h>
#include <setjmp.h>
#include <ctype.h>
#include <errno.h>
extern int errno;
FILE *popen();
#endif

#define OK 0
#define FALSE 0
#define TRUE 1
#define ERROR (-1)

/*
 * Max value for HOWMANY is 255.
 *   A larger value reduces system overhead but may evoke kernel bugs.
 *   133 corresponds to an XMODEM/CRC sector
 */
#ifndef HOWMANY
#define HOWMANY 133
#endif

/* Ward Christensen / CP/M parameters - Don't change these! */
#define ENQ 005
#define CAN ('X'&037)
#define XOFF ('s'&037)
#define XON ('q'&037)
#define SOH 1
#define STX 2
#define EOT 4
#define ACK 6
#define NAK 025
#define CPMEOF 032
#define WANTCRC 0103	/* send C not NAK to get crc not checksum */
#define TIMEOUT (-2)
#define RCDO (-3)
#define GCOUNT (-4)
#define ERRORMAX 5
#define RETRYMAX 5
#define WCEOT (-10)
#define PATHLEN 257	/* ready for 4.2 bsd ? */
#define UNIXFILE 0xF000	/* The S_IFMT file mask bit for stat */

int Zmodem=0;		/* ZMODEM protocol requested */
int Nozmodem = 0;	/* If invoked as "rb" */
unsigned Baudrate = 2400;
unsigned Effbaud = 2400;
#ifdef vax11c
#include "vrzsz.c"	/* most of the system dependent stuff here */
#else
#include "rbsb.c"	/* most of the system dependent stuff here */
#endif
#include "crctab.c"

char *substr();
FILE *fout;

/*
 * Routine to calculate the free bytes on the current file system
 *  ~0 means many free bytes (unknown)
 */
long getfree()
{
	return(~0L);	/* many free bytes ... */
}

int Lastrx;
int Crcflg;
int Firstsec;
int Eofseen;		/* indicates cpm eof (^Z) has been received */
int errors;
int Restricted=0;	/* restricted; no /.. or ../ in filenames */
#ifdef ONEREAD
/* Sorry, Regulus and some others don't work right in raw mode! */
int Readnum = 1;	/* Number of bytes to ask for in read() from modem */
#else
int Readnum = HOWMANY;	/* Number of bytes to ask for in read() from modem */
#endif

#define DEFBYTL 2000000000L	/* default rx file size */
long Bytesleft;		/* number of bytes of incoming file left */
long Modtime;		/* Unix style mod time for incoming file */
int Filemode;		/* Unix style mode for incoming file */
char Pathname[PATHLEN];
char *Progname;		/* the name by which we were called */

int Batch=0;
int Topipe=0;
int MakeLCPathname=TRUE;	/* make received pathname lower case */
int Verbose=0;
int Quiet=0;		/* overrides logic that would otherwise set verbose */
int Nflag = 0;		/* Don't really transfer files */
int Rxclob=FALSE;	/* Clobber existing file */
int Rxbinary=FALSE;	/* receive all files in bin mode */
int Rxascii=FALSE;	/* receive files in ascii (translate) mode */
int Thisbinary;		/* current file is to be received in bin mode */
int Blklen;		/* record length of received packets */

#ifdef SEGMENTS
int chinseg = 0;	/* Number of characters received in this data seg */
char secbuf[1+(SEGMENTS+1)*1024];
#else
char secbuf[1025];
#endif


char linbuf[HOWMANY];
int Lleft=0;		/* number of characters in linbuf */
time_t timep[2];
char Lzmanag;		/* Local file management request */
char zconv;		/* ZMODEM file conversion request */
char zmanag;		/* ZMODEM file management request */
char ztrans;		/* ZMODEM file transport request */
int Zctlesc;		/* Encode control characters */
int Zrwindow = 1400;	/* RX window size (controls garbage count) */

jmp_buf tohere;		/* For the interrupt on RX timeout */

#define xsendline(c) sendline(c)

#include "zm.c"

#include "zmr.c"

int tryzhdrtype=ZRINIT;	/* Header type to send corresponding to Last rx close */

alrm()
{
	longjmp(tohere, -1);
}

/* called by signal interrupt or terminate to clean things up */
bibi(n)
{
	if (Zmodem)
		zmputs(Attn);
	canit(); mode(0);
	fprintf(stderr, "rz: caught signal %d; exiting", n);
	cucheck();
	exit(128+n);
}

main(argc, argv)
char *argv[];
{
	register char *cp;
	register npats;
	char *virgin, **patts;
	char *getenv();
	int exitcode;

	Rxtimeout = 100;
	setbuf(stderr, NULL);
	if ((cp=getenv("SHELL")) && (substr(cp, "rsh") || substr(cp, "rksh")))
		Restricted=TRUE;

	from_cu();
#ifdef vax11c
	chkinvok(virgin = PROGNAME);
#else
	chkinvok(virgin=argv[0]);	/* if called as [-]rzCOMMAND set flag */
#endif
	npats = 0;
	while (--argc) {
		cp = *++argv;
		if (*cp == '-') {
			while( *++cp) {
				switch(*cp) {
				case '\\':
					 cp[1] = toupper(cp[1]);  continue;
				case '+':
					Lzmanag = ZMAPND; break;
				case 'a':
					Rxascii=TRUE;  break;
				case 'b':
					Rxbinary=TRUE; break;
				case 'c':
					Crcflg=TRUE; break;
#ifndef vax11c
				case 'D':
					Nflag = TRUE; break;
#endif
				case 'e':
					Zctlesc = 1; break;
				case 'p':
					Lzmanag = ZMPROT;  break;
				case 'q':
					Quiet=TRUE; Verbose=0; break;
				case 't':
					if (--argc < 1) {
						usage();
					}
					Rxtimeout = atoi(*++argv);
					if (Rxtimeout<10 || Rxtimeout>1000)
						usage();
					break;
				case 'w':
					if (--argc < 1) {
						usage();
					}
					Zrwindow = atoi(*++argv);
					break;
				case 'u':
					MakeLCPathname=FALSE; break;
				case 'v':
					++Verbose; break;
				case 'y':
					Rxclob=TRUE; break;
				default:
					usage();
				}
			}
		}
		else if ( !npats && argc>0) {
			if (argv[0][0]) {
				npats=argc;
				patts=argv;
			}
		}
	}
	if (npats > 1)
		usage();
	if (Batch && npats)
		usage();
	if (Verbose) {
		if (freopen(LOGFILE, "a", stderr)==NULL) {
			printf("Can't open log file %s\n",LOGFILE);
			exit(0200);
		}
		setbuf(stderr, NULL);
		fprintf(stderr, "argv[0]=%s Progname=%s\n", virgin, Progname);
	}
	if (Fromcu && !Quiet) {
		if (Verbose == 0)
			Verbose = 2;
	}
	vfile("%s %s for %s\n", Progname, VERSION, OS);
	mode(1);
	if (signal(SIGINT, bibi) == SIG_IGN) {
		signal(SIGINT, SIG_IGN); signal(SIGKILL, SIG_IGN);
	}
	else {
		signal(SIGINT, bibi); signal(SIGKILL, bibi);
	}
	signal(SIGTERM, bibi);
	if (wcreceive(npats, patts)==ERROR) {
		exitcode=0200;
		canit();
	}
	mode(0);
	if (exitcode && !Zmodem)	/* bellow again with all thy might. */
		canit();
	if (exitcode)
		cucheck();
	exit(exitcode ? exitcode:SS_NORMAL);
}


usage()
{
	cucheck();
	fprintf(stderr,"Usage:	rz [-abeuvy]		(ZMODEM)\n");
	fprintf(stderr,"or	rb [-abuvy]		(YMODEM)\n");
	fprintf(stderr,"or	rx [-abcv] file	(XMODEM or XMODEM-1k)\n");
	fprintf(stderr,"	  -a ASCII transfer (strip CR)\n");
	fprintf(stderr,"	  -b Binary transfer for all files\n");
#ifndef vax11c
	fprintf(stderr,"	  -c Use 16 bit CRC	(XMODEM)\n");
#endif
	fprintf(stderr,"	  -e Escape control characters	(ZMODEM)\n");
	fprintf(stderr,"	  -v Verbose more v's give more info\n");
	fprintf(stderr,"	  -y Yes, clobber existing file if any\n");
	fprintf(stderr,"%s %s for %s by Chuck Forsberg, Omen Technology INC\n",
	  Progname, VERSION, OS);
	fprintf(stderr, "\t\t\042The High Reliability Software\042\n");
	exit(SS_NORMAL);
}
/*
 *  Debugging information output interface routine
 */
/* VARARGS1 */
vfile(f, a, b, c)
register char *f;
{
	if (Verbose > 2) {
		fprintf(stderr, f, a, b, c);
		fprintf(stderr, "\n");
	}
}

/*
 * Let's receive something already.
 */

char *rbmsg =
"%s ready. To begin transfer, type \"%s file ...\" to your modem program\r\n\n";

wcreceive(argc, argp)
char **argp;
{
	register c;

	if (Batch || argc==0) {
		Crcflg=1;
		if ( !Quiet)
			fprintf(stderr, rbmsg, Progname, Nozmodem?"sb":"sz");
		if (c=tryz()) {
			if (c == ZCOMPL)
				return OK;
			if (c == ERROR)
				goto fubar;
			c = rzfiles();
			if (c)
				goto fubar;
		} else {
			for (;;) {
				if (wcrxpn(secbuf)== ERROR)
					goto fubar;
				if (secbuf[0]==0)
					return OK;
				if (procheader(secbuf) == ERROR)
					goto fubar;
				if (wcrx()==ERROR)
					goto fubar;
			}
		}
	} else {
		Bytesleft = DEFBYTL; Filemode = 0; Modtime = 0L;

		procheader(""); strcpy(Pathname, *argp); checkpath(Pathname);
		fprintf(stderr, "\nrz: ready to receive %s\r\n", Pathname);
		if ((fout=fopen(Pathname, "w")) == NULL)
			return ERROR;
		if (wcrx()==ERROR)
			goto fubar;
	}
	return OK;
fubar:
	canit();
#ifndef vax11c
	if (Topipe && fout) {
		pclose(fout);  return ERROR;
	}
#endif
	Modtime = 1;
	if (fout)
		fclose(fout);
#ifndef vax11c
	if (Restricted) {
		unlink(Pathname);
		fprintf(stderr, "\r\nrz: %s removed.\r\n", Pathname);
	}
#endif
	return ERROR;
}


/*
 * Fetch a pathname from the other end as a C ctyle ASCIZ string.
 * Length is indeterminate as long as less than Blklen
 * A null string represents no more files (YMODEM)
 */
wcrxpn(rpn)
char *rpn;	/* receive a pathname */
{
	register c;

#ifdef NFGVMIN
	readline(1);
#else
	purgeline();
#endif

et_tu:
	Firstsec=TRUE;  Eofseen=FALSE;
	sendline(Crcflg?WANTCRC:NAK);
	Lleft=0;	/* Do read next time ... */
	while ((c = wcgetsec(rpn, 100)) != 0) {
		if (c == WCEOT) {
			zperr( "Pathname fetch returned %d", c);
			sendline(ACK);
			Lleft=0;	/* Do read next time ... */
			readline(1);
			goto et_tu;
		}
		return ERROR;
	}
	sendline(ACK);
	return OK;
}

/*
 * Adapted from CMODEM13.C, written by
 * Jack M. Wierda and Roderick W. Hart
 */

wcrx()
{
	register int sectnum, sectcurr;
	register char sendchar;
	register char *p;
	int cblklen;			/* bytes to dump this block */

	Firstsec=TRUE;sectnum=0; Eofseen=FALSE;
	sendchar=Crcflg?WANTCRC:NAK;