static char *sccsid = "@(#)Kermit version 3.0(1) 11/5/84"; /* * K e r m i t File Transfer Utility * * UNIX Kermit, Columbia University, 1981, 1982, 1983, 1984 * Bill Catchings, Bob Cattani, Chris Maio, Frank da Cruz, * Alan Crosswell, Jeff Damens * * Also: Jim Guyton, Rand Corporation * Walter Underwood, Ford Aerospace * * usage: kermit c [lbphe line baud par escape-char] to connect * kermit s [ddiflbpt line baud par] file ... to send files * kermit r [ddiflbpt line baud par] to receive files * * where c=connect, s=send, r=receive, * d=debug, i=image mode, f=no filename conversion, l=tty line, * b=baud rate, e=escape char, h=half duplex, t=turnaround char, * p=parity, z=log packet transactions. * * For remote Kermit, format is either: * kermit r to receive files * or kermit s file ... to send files * */ /* * Modification History: * * July 84 Bill Catchings and Jeff Damens - Add necessary commands for * communicating with IBM mainframes (t,p,h). Also started to * make it more modular. Eventually all conditionals should be * removed. After that we will go to a LEX version which will * implement all the states needed for a full server version. A * command parser is also needed. Limited VAX VMS support was also * added (no connect command). Link together KERMIT.C, KER%%%.C * (UNX for all present UNIX versions, VMS for VAX VMS) and KERCN%.C * (V for Venix on the Pro and U for UNIX this module not used for * VMS). * * May 21 84 - Roy Smith (CUCS), strip parity from checksum in rpack() * * Oct. 17 Included fixes from Alan Crosswell (CUCCA) for IBM_UTS: * - Changed MYEOL character from \n to \r. * - Change char to int in bufill so getc would return -1 on * EOF instead of 255 (-1 truncated to 8 bits) * - Added read() in rpack to eat the EOL character * - Added fflush() call in printmsg to force the output * NOTE: The last three changes are not conditionally compiled * since they should work equally well on any system. * * Changed Berkeley 4.x conditional compilation flag from * UNIX4X to UCB4X. * Added support for error packets and cleaned up the printing * routines. */ /* Conditional compilation for different machines/operating systems */ /* One and only one of the following lines should be 1 */ #define UCB4X 1 /* Berkeley 4.x UNIX */ #define TOPS_20 0 /* TOPS-20 */ #define IBM_UTS 0 /* Amdahl UTS on IBM systems */ #define VAX_VMS 0 /* VAX/VMS */ /* Conditional compilation for the different Unix variants */ /* 0 means don't compile it, nonzero means do */ #if UCB4X #define V6_LIBS 0 /* Dont't use retrofit libraries */ #define NO_FIONREAD 0 /* We have ioctl(FIONREAD,...) for flushinput() */ #define NO_TANDEM 0 /* We have TANDEM line discipline (xon/xoff) */ #endif #if IBM_UTS #define V6_LIBS 0 /* Don't use retrofit libraries */ #define NO_FIONREAD 1 /* No ioctl(FIONREAD,...) for flushinput() */ #define NO_TANDEM 1 /* No TANDEM line discipline (xon/xoff) */ #endif #if TOPS_20 #define V6_LIBS 0 /* Don't use retrofit libraries */ #define NO_FIONREAD 1 /* No ioctl(FIONREAD,...) for flushinput() */ #define NO_TANDEM 1 /* No TANDEM line discipline (xon/xoff) */ #endif #if VAX_VMS #define V6_LIBS 0 /* Don't use retrofit libraries */ #define NO_FIONREAD 1 /* No ioctl(FIONREAD,...) for flushinput() */ #define NO_TANDEM 1 /* No TANDEM line discipline (xon/xoff) */ #endif #include /* Standard UNIX definitions */ #include #if V6_LIBS #include #include #include #else #include #include #endif #if !(V6_LIBS | VAX_VMS) #include #endif #if NO_TANDEM #define TANDEM 0 /* define it to be nothing if it's unsupported */ #endif /* Symbol Definitions */ #define MAXPACKSIZ 94 /* Maximum packet size */ #define SOH 1 /* Start of header */ #define CR 13 /* ASCII Carriage Return */ #define SP 32 /* ASCII space */ #define DEL 127 /* Delete (rubout) */ #define XON 17 /* ASCII XON */ #define MAXTRY 10 /* Times to retry a packet */ #define MYQUOTE '#' /* Quote character I will use */ #define MYPAD 0 /* Number of padding characters I will need */ #define MYPCHAR 0 /* Padding character I need (NULL) */ #define MYTIME 10 /* Seconds after which I should be timed out */ #define MAXTIM 60 /* Maximum timeout interval */ #define MINTIM 2 /* Minumum timeout interval */ #define TRUE -1 /* Boolean constants */ #define FALSE 0 #define DEFESC '^' /* Default escape character for CONNECT */ #define DEFTRN FALSE /* Default turn around */ #define DEFLCH FALSE /* Default local echo */ #define DEFPAR FALSE /* Default parity */ #define DEFIM FALSE /* Default image mode */ #if UCB4X | VAX_VMS | IBM_UTS #define DEFFNC TRUE /* Default file name conversion */ #else #define DEFFNC FALSE #endif #if IBM_UTS | VAX_VMS #define MYEOL '\r' /* End-Of-Line character for UTS or VMS systems */ #else #define MYEOL '\n' /* End-Of-Line character I need */ #endif /* Macro Definitions */ /* * tochar: converts a control character to a printable one by adding a space. * * unchar: undoes tochar. * * ctl: converts between control characters and printable characters by * toggling the control bit (ie. ^A becomes A and A becomes ^A). * * unpar: turns off the parity bit. */ #define tochar(ch) ((ch) + ' ') #define unchar(ch) ((ch) - ' ') #define ctl(ch) ((ch) ^ 64 ) #define unpar(ch) ((ch) & 127) /* Conditional Global Variables */ #if VAX_VMS int confd, /* FD of the controlling terminal */ ttnam, /* Line name pointer */ oldtty[4], oldcon[4]; #else struct sgttyb oldtty; /* Controlling tty raw mode */ #endif /* Global Variables */ int size, /* Size of present data */ rpsiz, /* Maximum receive packet size */ spsiz, /* Maximum send packet size */ pad, /* How much padding to send */ timint, /* Timeout for foreign host on sends */ n, /* Packet number */ numtry, /* Times this packet retried */ oldtry, /* Times previous packet retried */ ttyfd, /* File descriptor of tty for I/O, 0 if remote */ remote, /* -1 means we're a remote kermit */ image, /* -1 means 8-bit mode */ parflg, /* TRUE means use parity specified */ turn, /* TRUE means look for turnaround char (XON) */ lecho, /* TRUE for locally echo chars in connect mode */ debug, /* Indicates level of debugging output (0=none) */ pktdeb, /* TRUE means log all packet to a file */ filnamcnv, /* -1 means do file name case conversions */ speed, /* speed to set */ filecount; /* Number of files left to send */ char state, /* Present state of the automaton */ cchksum, /* Our (computed) checksum */ padchar, /* Padding character to send */ eol, /* End-Of-Line character to send */ escchr, /* Connect command escape character */ quote, /* Quote character in incoming data */ **filelist, /* List of files to be sent */ *filnam, /* Current file name */ recpkt[MAXPACKSIZ], /* Receive packet buffer */ packet[MAXPACKSIZ]; /* Packet buffer */ FILE *fp, /* File pointer for current disk file */ *dpfp; /* File pointer for debugging packet log file */ jmp_buf env; /* Environment ptr for timeout longjump */ /* * m a i n * * Main routine - parse command and options, set up the * tty lines, and dispatch to the appropriate routine. */ main(argc,argv) int argc; /* Character pointers to and count of */ char **argv; /* command line arguments */ { char *ttyname, /* tty name for LINE argument */ *cp; /* char pointer */ int cflg, rflg, sflg; /* flags for CONNECT, RECEIVE, SEND */ if (argc < 2) usage(); /* Make sure there's a command line */ cp = *++argv; argv++; argc -= 2; /* Set up pointers to args */ /* Initialize these values and hope the first packet will get across OK */ eol = CR; /* EOL for outgoing packets */ quote = '#'; /* Standard control-quote char "#" */ pad = 0; /* No padding */ padchar = NULL; /* Use null if any padding wanted */ speed = cflg = sflg = rflg = 0; /* Turn off all parse flags */ ttyname = 0; /* Default is remote mode */ pktdeb = FALSE; /* No packet file debugging */ turn = DEFTRN; /* Default turnaround */ lecho = DEFLCH; /* Default local echo */ parflg = DEFPAR; /* Default parity */ image = DEFIM; /* Default image mode */ filnamcnv = DEFFNC; /* Default filename case conversion */ escchr = DEFESC; /* Default escape character */ while ((*cp) != NULL) /* Parse characters in first arg. */ switch (*cp++) { case 'c': cflg++; break; /* C = Connect command */ case 's': sflg++; break; /* S = Send command */ case 'r': rflg++; break; /* R = Receive command */ case 'd': /* D = Increment debug mode count */ debug++; break; case 'f': filnamcnv = FALSE; /* F = don't do case conversion */ break; /* on filenames */ case 'i': /* I = Image (8-bit) mode */ image = TRUE; break; case 'h': /* H = Half duplex mode */ lecho = TRUE; break; case 't': /* T = Turnaround character (XON) */ turn = TRUE; break; case 'l': /* L = specify tty line to use */ if (argc--) ttyname = *argv++; else usage(); if (debug) printf("Line to remote host is %s\n",ttyname); break; case 'e': /* E = specify escape char */ if (argc--) escchr = **argv++; else usage(); if (debug) printf("Escape char is \"%c\"\n",escchr); break; case 'p': /* P = specify parity */ if (argc--) switch ((parflg = **argv++)) { case 'n': parflg = FALSE; break; /* None, no parity */ case 'e': case 'm': case 'o': case 's': break; default: parflg = FALSE; usage(); } else usage(); if (debug) printf("Parity is %c\n",parflg); break; case 'z': /* Use packet file debugging */ pktdeb = TRUE; break; /* Move conditional commands to expansion command table */ case 'b': /* B = specify baud rate */ #if UCB4X if (argc--) speed = atoi(*argv++); else usage(); if (debug) printf("Line speed to remote host is %d\n",speed); break; #else printmsg("Speed setting implemented for Unix only."); exit(1); #endif default: usage(); } /* Done parsing */ if ((cflg+sflg+rflg) != 1) /* Only one command allowed */ usage(); if (ttyname) /* If LINE was specified, we */ { /* operate in local mode */ ttyfd = ttopen(ttyname); /* Open the tty line */ ttbin(ttyfd,&oldtty); /* Put the tty in binary mode */ remote = FALSE; /* Indicate we're in local mode */ } else /* No LINE specified so we operate */ { /* in remote mode (ie. controlling */ ttyfd = ttopen(0); /* tty is the communications line) */ ttbin(ttyfd,&oldtty); /* Put the tty in binary mode */ remote = TRUE; } /* All set up, now execute the command that was given. */ if (!remote) printf("%s\n",sccsid+4); /* print version # */ if (pktdeb) /* Open packet file if requested */ if ((dpfp=fopen("PACKET.LOG","w"))==NULL) { if (debug) printf("Cannot create PACKET.LOG\n"); pktdeb = FALSE; /* Say file not being used */ } if (debug) { printf("Debugging level = %d\n\n",debug); if (pktdeb) printf("Logging all packets to PACKET.LOG\n\n"); if (cflg) printf("Connect command\n\n"); if (sflg) printf("Send command\n\n"); if (rflg) printf("Receive command\n\n"); } if (cflg) connect(); /* Connect command */ if (sflg) /* Send command */ { if (argc--) filnam = *argv++; /* Get file to send */ else { ttres(ttyfd,&oldtty); /* Restore controlling tty's modes */ usage(); /* and give error */ } fp = NULL; /* Indicate no file open yet */ filelist = argv; /* Set up the rest of the file list */ filecount = argc; /* Number of files left to send */ if (sendsw() == FALSE) /* Send the file(s) */ printmsg("Send failed."); /* Report failure */ else /* or */ printmsg("done."); /* success */ } if (rflg) /* Receive command */ { if (recsw() == FALSE) /* Receive the file(s) */ printmsg("Receive failed."); else /* Report failure */ printmsg("done."); /* or success */ } ttres(ttyfd,&oldtty); /* Restore controlling tty's modes */ if (pktdeb) fclose(dpfp); /* Close the debug file */ } /* * s e n d s w * * Sendsw is the state table switcher for sending files. It loops until * either it finishes, or an error is encountered. The routines called * by sendsw are responsible for changing the state. * */ sendsw() { char sinit(), sfile(), sdata(), seof(), sbreak(); state = 'S'; /* Send initiate is the start state */ n = 0; /* Initialize message number */ numtry = 0; /* Say no tries yet */ if (remote) sleep(MYTIME); /* Sleep to give the guy a chance */ while(TRUE) /* Do this as long as necessary */ { if (debug) printf("sendsw state: %c\n",state); switch(state) { case 'S': state = sinit(); break; /* Send-Init */ case 'F': state = sfile(); break; /* Send-File */ case 'D': state = sdata(); break; /* Send-Data */ case 'Z': state = seof(); break; /* Send-End-of-File */ case 'B': state = sbreak(); break; /* Send-Break */ case 'C': return (TRUE); /* Complete */ case 'A': return (FALSE); /* "Abort" */ default: return (FALSE); /* Unknown, fail */ } } } /* * s i n i t * * Send Initiate: send this host's parameters and get other side's back. */ char sinit() { int num, len; /* Packet number, length */ if (debug) printf("In sinit retries: %d\n",numtry); if (numtry++ > MAXTRY) return('A'); /* If too many tries, give up */ spar(packet); /* Fill up init info packet */ flushinput(); /* Flush pending input */ spack('S',n,6,packet); /* Send an S packet */ switch(rpack(&len,&num,recpkt)) /* What was the reply? */ { case 'N': return(state); /* NAK, try it again */ case 'Y': /* ACK */ if (n != num) /* If wrong ACK, stay in S state */ return(state); /* and try again */ rpar(recpkt); /* Get other side's init info */ if (eol == 0) eol = '\n'; /* Check and set defaults */ if (quote == 0) quote = '#'; numtry = 0; /* Reset try counter */ n = (n+1)%64; /* Bump packet count */ return('F'); /* OK, switch state to F */ case 'E': /* Error packet received */ prerrpkt(recpkt); /* Print it out and */ return('A'); /* abort */ case FALSE: return(state); /* Receive failure, try again */ default: return('A'); /* Anything else, just "abort" */ } } /* * s f i l e * * Send File Header. */ char sfile() { int num, len; /* Packet number, length */ char filnam1[50], /* Converted file name */ *newfilnam, /* Pointer to file name to send */ *cp; /* char pointer */ if (numtry++ > MAXTRY) return('A'); /* If too many tries, give up */ if (fp == NULL) /* If not already open, */ { if (debug) printf(" Opening %s for sending.\n",filnam); fp = fopen(filnam,"r"); /* open the file to be sent */ if (fp == NULL) /* If bad file pointer, give up */ { error("Cannot open file %s",filnam); return('A'); } } strcpy(filnam1, filnam); /* Copy file name */ newfilnam = cp = filnam1; while (*cp != '\0') /* Strip off all leading directory */ if (*cp++ == '/') /* names (ie. up to the last /). */ newfilnam = cp; if (filnamcnv) /* Convert lower case to upper */ for (cp = newfilnam; *cp != '\0'; cp++) if (islower(*cp)) *cp = toupper(*cp); len = cp - newfilnam; /* Compute length of new filename */ printmsg("Sending %s as %s",filnam,newfilnam); spack('F',n,len,newfilnam); /* Send an F packet */ switch(rpack(&len,&num,recpkt)) /* What was the reply? */ { case 'N': /* NAK, just stay in this state, */ num = (--num<0 ? 63:num); /* unless it's NAK for next packet */ if (n != num) /* which is just like an ACK for */ return(state); /* this packet so fall thru to... */ case 'Y': /* ACK */ if (n != num) return(state); /* If wrong ACK, stay in F state */ numtry = 0; /* Reset try counter */ n = (n+1)%64; /* Bump packet count */ size = bufill(packet); /* Get first data from file */ return('D'); /* Switch state to D */ case 'E': /* Error packet received */ prerrpkt(recpkt); /* Print it out and */ return('A'); /* abort */ case FALSE: return(state); /* Receive failure, stay in F state */ default: return('A'); /* Something else, just "abort" */ } } /* * s d a t a * * Send File Data */ char sdata() { int num, len; /* Packet number, length */ if (numtry++ > MAXTRY) return('A'); /* If too many tries, give up */ spack('D',n,size,packet); /* Send a D packet */ switch(rpack(&len,&num,recpkt)) /* What was the reply? */ { case 'N': /* NAK, just stay in this state, */ num = (--num<0 ? 63:num); /* unless it's NAK for next packet */ if (n != num) /* which is just like an ACK for */ return(state); /* this packet so fall thru to... */ case 'Y': /* ACK */ if (n != num) return(state); /* If wrong ACK, fail */ numtry = 0; /* Reset try counter */ n = (n+1)%64; /* Bump packet count */ if ((size = bufill(packet)) == EOF) /* Get data from file */ return('Z'); /* If EOF set state to that */ return('D'); /* Got data, stay in state D */ case 'E': /* Error packet received */ prerrpkt(recpkt); /* Print it out and */ return('A'); /* abort */ case FALSE: return(state); /* Receive failure, stay in D */ default: return('A'); /* Anything else, "abort" */ } } /* * s e o f * * Send End-Of-File. */ char seof() { int num, len; /* Packet number, length */ if (numtry++ > MAXTRY) return('A'); /* If too many tries, "abort" */ spack('Z',n,0,packet); /* Send a 'Z' packet */ switch(rpack(&len,&num,recpkt)) /* What was the reply? */ { case 'N': /* NAK, just stay in this state, */ num = (--num<0 ? 63:num); /* unless it's NAK for next packet, */ if (n != num) /* which is just like an ACK for */ return(state); /* this packet so fall thru to... */ case 'Y': /* ACK */ if (n != num) return(state); /* If wrong ACK, hold out */ numtry = 0; /* Reset try counter */ n = (n+1)%64; /* and bump packet count */ if (debug) printf(" Closing input file %s, ",filnam); fclose(fp); /* Close the input file */ fp = NULL; /* Set flag indicating no file open */ if (debug) printf("looking for next file...\n"); if (gnxtfl() == FALSE) /* No more files go? */ return('B'); /* if not, break, EOT, all done */ if (debug) printf(" New file is %s\n",filnam); return('F'); /* More files, switch state to F */ case 'E': /* Error packet received */ prerrpkt(recpkt); /* Print it out and */ return('A'); /* abort */ case FALSE: return(state); /* Receive failure, stay in Z */ default: return('A'); /* Something else, "abort" */ } } /* * s b r e a k * * Send Break (EOT) */ char sbreak() { int num, len; /* Packet number, length */ if (numtry++ > MAXTRY) return('A'); /* If too many tries "abort" */ spack('B',n,0,packet); /* Send a B packet */ switch (rpack(&len,&num,recpkt)) /* What was the reply? */ { case 'N': /* NAK, just stay in this state, */ num = (--num<0 ? 63:num); /* unless NAK for previous packet, */ if (n != num) /* which is just like an ACK for */ return(state); /* this packet so fall thru to... */ case 'Y': /* ACK */ if (n != num) return(state); /* If wrong ACK, fail */ numtry = 0; /* Reset try counter */ n = (n+1)%64; /* and bump packet count */ return('C'); /* Switch state to Complete */ case 'E': /* Error packet received */ prerrpkt(recpkt); /* Print it out and */ return('A'); /* abort */ case FALSE: return(state); /* Receive failure, stay in B */ default: return ('A'); /* Other, "abort" */ } } /* * r e c s w * * This is the state table switcher for receiving files. */ recsw() { char rinit(), rfile(), rdata(); /* Use these procedures */ state = 'R'; /* Receive-Init is the start state */ n = 0; /* Initialize message number */ numtry = 0; /* Say no tries yet */ while(TRUE) { if (debug) printf(" recsw state: %c\n",state); switch(state) /* Do until done */ { case 'R': state = rinit(); break; /* Receive-Init */ case 'F': state = rfile(); break; /* Receive-File */ case 'D': state = rdata(); break; /* Receive-Data */ case 'C': return(TRUE); /* Complete state */ case 'A': return(FALSE); /* "Abort" state */ } } } /* * r i n i t * * Receive Initialization */ char rinit() { int len, num; /* Packet length, number */ if (numtry++ > MAXTRY) return('A'); /* If too many tries, "abort" */ switch(rpack(&len,&num,packet)) /* Get a packet */ { case 'S': /* Send-Init */ rpar(packet); /* Get the other side's init data */ spar(packet); /* Fill up packet with my init info */ spack('Y',n,6,packet); /* ACK with my parameters */ oldtry = numtry; /* Save old try count */ numtry = 0; /* Start a new counter */ n = (n+1)%64; /* Bump packet number, mod 64 */ return('F'); /* Enter File-Receive state */ case 'E': /* Error packet received */ prerrpkt(recpkt); /* Print it out and */ return('A'); /* abort */ case FALSE: /* Didn't get packet */ spack('N',n,0,0); /* Return a NAK */ return(state); /* Keep trying */ default: return('A'); /* Some other packet type, "abort" */ } } /* * r f i l e * * Receive File Header */ char rfile() { int num, len; /* Packet number, length */ char filnam1[50]; /* Holds the converted file name */ if (numtry++ > MAXTRY) return('A'); /* "abort" if too many tries */ switch(rpack(&len,&num,packet)) /* Get a packet */ { case 'S': /* Send-Init, maybe our ACK lost */ if (oldtry++ > MAXTRY) return('A'); /* If too many tries "abort" */ if (num == ((n==0) ? 63:n-1)) /* Previous packet, mod 64? */ { /* Yes, ACK it again with */ spar(packet); /* our Send-Init parameters */ spack('Y',num,6,packet); numtry = 0; /* Reset try counter */ return(state); /* Stay in this state */ } else return('A'); /* Not previous packet, "abort" */ case 'Z': /* End-Of-File */ if (oldtry++ > MAXTRY) return('A'); if (num == ((n==0) ? 63:n-1)) /* Previous packet, mod 64? */ { /* Yes, ACK it again. */ spack('Y',num,0,0); numtry = 0; return(state); /* Stay in this state */ } else return('A'); /* Not previous packet, "abort" */ case 'F': /* File Header (just what we want) */ if (num != n) return('A'); /* The packet number must be right */ strcpy(filnam1, packet); /* Copy the file name */ if (filnamcnv) /* Convert upper case to lower */ for (filnam=filnam1; *filnam != '\0'; filnam++) if (isupper(*filnam)) *filnam = tolower(*filnam); if ((fp=fopen(filnam1,"w"))==NULL) /* Try to open a new file */ { error("Cannot create %s",filnam1); /* Give up if can't */ return('A'); } else /* OK, give message */ printmsg("Receiving %s as %s",packet,filnam1); spack('Y',n,0,0); /* Acknowledge the file header */ oldtry = numtry; /* Reset try counters */ numtry = 0; /* ... */ n = (n+1)%64; /* Bump packet number, mod 64 */ return('D'); /* Switch to Data state */ case 'B': /* Break transmission (EOT) */ if (num != n) return ('A'); /* Need right packet number here */ spack('Y',n,0,0); /* Say OK */ return('C'); /* Go to complete state */ case 'E': /* Error packet received */ prerrpkt(recpkt); /* Print it out and */ return('A'); /* abort */ case FALSE: /* Didn't get packet */ spack('N',n,0,0); /* Return a NAK */ return(state); /* Keep trying */ default: return ('A'); /* Some other packet, "abort" */ } } /* * r d a t a * * Receive Data */ char rdata() { int num, len; /* Packet number, length */ if (numtry++ > MAXTRY) return('A'); /* "abort" if too many tries */ switch(rpack(&len,&num,packet)) /* Get packet */ { case 'D': /* Got Data packet */ if (num != n) /* Right packet? */ { /* No */ if (oldtry++ > MAXTRY) return('A'); /* If too many tries, abort */ if (num == ((n==0) ? 63:n-1)) /* Else check packet number */ { /* Previous packet again? */ spack('Y',num,6,packet); /* Yes, re-ACK it */ numtry = 0; /* Reset try counter */ return(state); /* Don't write out data! */ } else return('A'); /* sorry, wrong number */ } /* Got data with right packet number */ bufemp(packet,len); /* Write the data to the file */ spack('Y',n,0,0); /* Acknowledge the packet */ oldtry = numtry; /* Reset the try counters */ numtry = 0; /* ... */ n = (n+1)%64; /* Bump packet number, mod 64 */ return('D'); /* Remain in data state */ case 'F': /* Got a File Header */ if (oldtry++ > MAXTRY) return('A'); /* If too many tries, "abort" */ if (num == ((n==0) ? 63:n-1)) /* Else check packet number */ { /* It was the previous one */ spack('Y',num,0,0); /* ACK it again */ numtry = 0; /* Reset try counter */ return(state); /* Stay in Data state */ } else return('A'); /* Not previous packet, "abort" */ case 'Z': /* End-Of-File */ if (num != n) return('A'); /* Must have right packet number */ spack('Y',n,0,0); /* OK, ACK it. */ fclose(fp); /* Close the file */ n = (n+1)%64; /* Bump packet number */ return('F'); /* Go back to Receive File state */ case 'E': /* Error packet received */ prerrpkt(recpkt); /* Print it out and */ return('A'); /* abort */ case FALSE: /* Didn't get packet */ spack('N',n,0,0); /* Return a NAK */ return(state); /* Keep trying */ default: return('A'); /* Some other packet, "abort" */ } } /* * KERMIT utilities. */ dopar (ch) char ch; { int a; if (!parflg) return(ch); /* false, no parity */ ch &= 0177; switch (parflg) { case 'm': return(ch | 128); /* Mark */ case 's': return(ch & 127); /* Space */ case 'o': ch |= 128; /* Odd */ case 'e': /* Even */ a = (ch & 15) ^ ((ch >> 4) & 15); a = (a & 3) ^ ((a >> 2) & 3); a = (a & 1) ^ ((a >> 1) & 1); return((ch & 0177) | (a << 7)); default: return(ch); } } clkint() /* Timer interrupt handler */ { longjmp(env,TRUE); /* Tell rpack to give up */ } /* * s p a c k * * Send a Packet */ spack(type,num,len,data) char type, *data; int num, len; { int i; /* Character loop counter */ char chksum, buffer[100]; /* Checksum, packet buffer */ register char *bufp; /* Buffer pointer */ if (debug>1) /* Display outgoing packet */ { if (data != NULL) data[len] = '\0'; /* Null-terminate data to print it */ printf(" spack type: %c\n",type); printf(" num: %d\n",num); printf(" len: %d\n",len); if (data != NULL) printf(" data: \"%s\"\n",data); } bufp = buffer; /* Set up buffer pointer */ for (i=1; i<=pad; i++) write(ttyfd,&padchar,1); /* Issue any padding */ *bufp++ = dopar(SOH); /* Packet marker, ASCII 1 (SOH) */ *bufp++ = dopar(tochar(len+3)); /* Send the character count */ chksum = tochar(len+3); /* Initialize the checksum */ *bufp++ = dopar(tochar(num)); /* Packet number */ chksum += tochar(num); /* Update checksum */ *bufp++ = dopar(type); /* Packet type */ chksum += type; /* Update checksum */ for (i=0; i> 6)+chksum)&077; /* Compute final checksum */ *bufp++ = dopar(tochar(chksum)); /* Put it in the packet */ *bufp++ = dopar(eol); /* Extra-packet line terminator */ if (pktdeb) { *bufp = '\0'; /* Terminate the string */ fprintf(dpfp,"\nSpack:%s",buffer); } write(ttyfd,buffer,bufp-buffer); /* Send the packet */ } /* * r p a c k * * Read a Packet */ rpack(len,num,data) int *len, *num; /* Packet length, number */ char *data; /* Packet data */ { int i, done; /* Data character number, loop exit */ char t, /* Current input character */ type, /* Packet type */ rchksum; /* Checksum received from other host */ #if UCB4X /* TOPS-20 can't handle timeouts... */ if (setjmp(env)) return FALSE; /* Timed out, fail */ signal(SIGALRM,clkint); /* Setup the timeout */ if ((timint > MAXTIM) || (timint < MINTIM)) timint = MYTIME; alarm(timint); #endif /* UCB4X */ if (pktdeb) fprintf(dpfp,"\nRpack:"); while (inchr() != SOH); /* Wait for packet header */ done = FALSE; /* Got SOH, init loop */ while (!done) /* Loop to get a packet */ { cchksum = 0; if ((t = cinchr()) == SOH) continue; /* Resynchronize if SOH */ *len = unchar(t)-3; /* Character count */ if ((t = cinchr()) == SOH) continue; /* Resynchronize if SOH */ *num = unchar(t); /* Packet number */ if ((t = cinchr()) == SOH) continue; /* Resynchronize if SOH */ type = t; /* Packet type */ /* Put len characters from the packet into the data buffer */ for (i=0; i<*len; i++) if ((data[i] = cinchr()) == SOH) continue; /* Resynch if SOH */ data[*len] = 0; /* Mark the end of the data */ if ((t = inchr()) == SOH) continue; /* Resynchronize if SOH */ rchksum = unchar(t); /* Convert to numeric */ done = TRUE; /* Got checksum, done */ } if (turn) /* User requested trunaround char */ while (inchr() != XON); /* handling, spin until an XON */ #if UCB4X alarm(0); /* Disable the timer interrupt */ #endif if (debug>1) /* Display incoming packet */ { if (data != NULL) data[*len] = '\0'; /* Null-terminate data to print it */ printf(" rpack type: %c\n",type); printf(" num: %d\n",*num); printf(" len: %d\n",*len); if (data != NULL) printf(" data: \"%s\"\n",data); } /* Fold in bits 7,8 to compute */ cchksum = (((cchksum&0300) >> 6)+cchksum)&077; /* final checksum */ if (cchksum != rchksum) return(FALSE); return(type); /* All OK, return packet type */ } /* * Get a parity adjusted character from the line, add it to the checksum * and return it. */ cinchr() { char ch; ch = inchr(); /* Get a character */ cchksum += ch; /* Add to the checksum */ return(ch); } /* * Get a character from the line. Do any necessary parity stripping * and return the character. */ inchr() { char ch; read(ttyfd,&ch,1); if (pktdeb) /* If debugging put a copy in file */ fprintf(dpfp,"%c:%03o|",ch,ch); if(parflg) ch = unpar(ch); /* Handle parity */ return(ch); } /* * b u f i l l * * Get a bufferful of data from the file that's being sent. * Only control-quoting is done; 8-bit & repeat count prefixes are * not handled. */ bufill(buffer) char buffer[]; /* Buffer */ { int i, /* Loop index */ t; /* Char read from file */ char t7; /* 7-bit version of above */ i = 0; /* Init data buffer pointer */ while((t = getc(fp)) != EOF) /* Get the next character */ { t7 = unpar(t); /* Get low order 7 bits */ if (t7 < SP || t7==DEL || t7==quote) /* Does this char require */ { /* special handling? */ if (t=='\n' && !image) { /* Do LF->CRLF mapping if !image */ buffer[i++] = quote; buffer[i++] = ctl('\r'); } buffer[i++] = quote; /* Quote the character */ if (t7 != quote) { t = ctl(t); /* and uncontrolify */ t7 = ctl(t7); } } if (!parflg) buffer[i++] = t; /* Deposit the character itself */ else buffer[i++] = t7; if (i >= spsiz-8) return(i); /* Check length */ } if (i==0) return(EOF); /* Wind up here only on EOF */ return(i); /* Handle partial buffer */ } /* * b u f e m p * * Put data from an incoming packet into a file. */ bufemp(buffer,len) char buffer[]; /* Buffer */ int len; /* Length */ { int i; /* Counter */ char t; /* Character holder */ for (i=0; i