head 1.1; access ; symbols ; locks ; comment @ * @; 1.1 date 89.02.16.13.10.52; author pkern; state Exp; branches ; next ; desc @@ 1.1 log @Initial revision @ text @/* * K e r m i t File Transfer Utility * * UNIX Kermit, Columbia University, 1981, 1982, 1983 * Bill Catchings, Bob Cattani, Chris Maio, Frank da Cruz, Alan Crosswell * * Also: Jim Guyton, Rand Corporation * Walter Underwood, Ford Aerospace * * usage: kermit c [lbe line baud escapechar] to connect * kermit s [d..iflb line baud] file ... to send files * kermit r [d..iflb line baud] 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. * * For remote Kermit, format is either: * kermit r to receive files * or kermit s file ... to send files * */ /* * Modification History: * * 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. */ #include /* Standard UNIX definitions */ /* Conditional compilation for different machines/operating systems */ /* One and only one of the following lines should be 1 */ #define UCB4X 0 /* 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 (not yet implemented) */ /* 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 V6_LIBS #include #include #include #else #ifdef unix #include #include #else #include #endif #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 ESCCHR '^' /* Default escape character for CONNECT */ #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) */ #if IBM_UTS #define MYEOL '\r' /* End-Of-Line character for UTS systems */ #else #define MYEOL '\n' /* End-Of-Line character I need */ #endif #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 /* 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). */ #define tochar(ch) ((ch) + ' ') #define unchar(ch) ((ch) - ' ') #define ctl(ch) ((ch) ^ 64 ) /* Global Variables */ #ifndef unix static #endif 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 */ debug, /* indicates level of debugging output (0=none) */ filnamcnv, /* -1 means do file name case conversions */ filecount; /* Number of files left to send */ #ifndef unix static #endif char state, /* Present state of the automaton */ 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 */ #ifndef unix static #endif FILE *fp, /* File pointer for current disk file */ *log; /* File pointer for Logfile */ #ifdef unix jmp_buf env; /* Environment ptr for timeout longjump */ #else #define exit(a) longjmp(xjmp,a) static jmp_buf env, xjmp; extern unsigned int cntdn; #endif /* * m a i n * * Main routine - parse command and options, set up the * tty lines, and dispatch to the appropriate routine. */ #ifdef unix main(argc,argv) #else kermit(argc,argv) #endif int argc; /* Character pointers to and count of */ char **argv; /* command line arguments */ { char *ttyname, /* tty name for LINE argument */ *cp; /* char pointer */ int speed, /* speed of assigned tty, */ cflg, rflg, sflg; /* flags for CONNECT, RECEIVE, SEND */ #ifdef unix struct sgttyb rawmode, /* Controlling tty raw mode */ cookedmode, /* Controlling tty cooked mode */ ttymode; /* mode of tty line in LINE option */ #else int o_n, o_fmode, boom(), xboom(); counter(1); o_fmode = _fmode; _fmode = O_BINARY; debug = 0; if (o_n = setjmp(xjmp)) { counter(0); if (fp != NULL) { fclose(fp); fp = NULL; } _fmode = o_fmode; ctrlbrk(boom); return(o_n); } else ctrlbrk(xboom); #endif 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 */ #if UCB4X /* Default to 7-bit masking, CRLF */ image = FALSE; /* translation and filename case */ filnamcnv = TRUE; /* conversion for UNIX systems */ #else image = TRUE; /* Default to no processing for */ filnamcnv = FALSE; /* non-UNIX systems */ #endif escchr = ESCCHR; /* 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 */ #ifdef unix image = TRUE; break; /* (this is default for non-UNIX) */ #else image = FALSE; break; #endif #ifdef unix 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 '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 #endif } /* Done parsing */ if ((cflg+sflg+rflg) != 1) /* Only one command allowed */ usage(); #ifdef unix if (ttyname) /* If LINE was specified, we */ { /* operate in local mode */ ttyfd = open(ttyname,2); /* Open the tty line */ if (ttyfd < 0) { printmsg("Cannot open %s",ttyname); exit(1); } remote = FALSE; /* Indicate we're in local mode */ } else /* No LINE specified so we operate */ { /* in remote mode (ie. controlling */ ttyfd = 0; /* tty is the communications line) */ remote = TRUE; } /* Put the proper tty into the correct mode */ if (remote) /* If remote, use controlling tty */ { gtty(0,&cookedmode); /* Save current mode so we can */ gtty(0,&rawmode); /* restore it later */ rawmode.sg_flags |= (RAW|TANDEM); rawmode.sg_flags &= ~(ECHO|CRMOD); stty(0,&rawmode); /* Put tty in raw mode */ } else /* Local, use assigned line */ { gtty(ttyfd,&ttymode); ttymode.sg_flags |= (RAW|TANDEM); ttymode.sg_flags &= ~(ECHO|CRMOD); #if UCB4X /* Speed changing for UNIX only */ if (speed) /* User specified a speed? */ { switch(speed) /* Get internal system code */ { case 110: speed = B110; break; case 150: speed = B150; break; case 300: speed = B300; break; case 1200: speed = B1200; break; case 2400: speed = B2400; break; case 4800: speed = B4800; break; case 9600: speed = B9600; break; default: printmsg("Bad line speed."); exit(1); } ttymode.sg_ispeed = speed; ttymode.sg_ospeed = speed; } #endif /* UCB4X */ stty(ttyfd,&ttymode); /* Put asg'd tty in raw mode */ } #else remote = FALSE; #endif /* All set up, now execute the command that was given. */ if (debug) { printf("Debugging level = %d\n\n",debug); 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 #ifdef unix { if (remote) stty(0,&cookedmode); /* Restore controlling tty's modes */ usage(); /* and give error */ } #else usage(); #endif 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 */ } #ifdef unix if (remote) stty(0,&cookedmode); /* Restore controlling tty's modes */ #endif } /* * 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. * */ #ifndef unix static #endif 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 */ 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. */ #ifndef unix static #endif char sinit() { int num, len; /* Packet number, length */ 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. */ #ifndef unix static #endif 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 (*cp >= 'a' && *cp <= 'z') *cp ^= 040; 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 */ #ifndef unix static #endif 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. */ #ifndef unix static #endif 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) */ #ifndef unix static #endif 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. */ #ifndef unix static #endif 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 */ #ifndef unix static #endif 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 */ #ifndef unix static #endif 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 (*filnam >= 'A' && *filnam <= 'Z') *filnam |= 040; 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 */ #ifndef unix static #endif 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 */ #ifndef unix fp = NULL; #endif 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" */ } } /* * c o n n e c t * * Establish a virtual terminal connection with the remote host, over an * assigned tty line. */ #ifndef unix static #endif connect() { #ifdef unix int pid, /* Holds process id of child */ connected; /* Boolean connect flag */ char bel = '\07', c; struct sgttyb rawmode, /* Controlling tty raw mode */ cookedmode; /* Controlling tty cooked mode */ if (remote) /* Nothing to connect to in remote */ { /* mode, so just return */ printmsg("No line specified for connection."); return; } gtty(0,&cookedmode); /* Save current mode so we can */ gtty(0,&rawmode); /* restore it later */ rawmode.sg_flags |= (RAW|TANDEM); rawmode.sg_flags &= ~(ECHO|CRMOD); stty(0,&rawmode); /* Put tty in raw mode */ pid = fork(); /* Start fork to get typeout from remote host */ if (pid) /* Parent: send type-in to remote host */ { printmsg("connected...\r"); connected = TRUE; /* Put us in "connect mode" */ while (connected) { read(0,&c,1); /* Get a character */ if ((c&0177) == escchr) /* Check for escape character */ { read(0,&c,1); if ((c&0177) == escchr) write(ttyfd,&c,1); else switch (c&0177) { case 'c': case 'C': connected = FALSE; write(0,"\r\n",2); break; case 'h': case 'H': write(0,"\r\nYes, I'm still here...\r\n",26); break; default: write(0,&bel,1); break; } } else { /* If not escape charater, */ write(ttyfd,&c,1); /* write it out */ c = NULL; /* Nullify it (why?) */ } } kill(pid,9); /* Done, kill the child */ wait(0); /* and bury him */ stty(0,&cookedmode); /* Restore tty mode */ printmsg("disconnected."); return; /* Done */ } else /* Child does the reading from the remote host */ { while(1) /* Do this forever */ { read(ttyfd,&c,1); write(1,&c,1); } } #endif } /* * KERMIT utilities. */ #ifndef unix static #endif clkint() /* Timer interrupt handler */ { longjmp(env,TRUE); /* Tell rpack to give up */ } /* * s p a c k * * Send a Packet */ #ifndef unix static #endif 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++) #ifdef unix write(ttyfd,&padchar,1); /* Issue any padding */ #else xwrite(&padchar,1); #endif *bufp++ = SOH; /* Packet marker, ASCII 1 (SOH) */ *bufp++ = tochar(len+3); /* Send the character count */ chksum = tochar(len+3); /* Initialize the checksum */ *bufp++ = tochar(num); /* Packet number */ chksum += tochar(num); /* Update checksum */ *bufp++ = type; /* Packet type */ chksum += type; /* Update checksum */ for (i=0; i> 6)+chksum)&077; /* Compute final checksum */ *bufp++ = tochar(chksum); /* Put it in the packet */ *bufp = eol; /* Extra-packet line terminator */ #ifdef unix write(ttyfd, buffer,bufp-buffer+1); /* Send the packet */ #else xwrite( buffer,bufp-buffer+1); #endif } /* * r p a c k * * Read a Packet */ #ifndef unix static #endif 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 */ cchksum, /* Our (computed) checksum */ rchksum; /* Checksum received from other host */ #ifdef unix #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 */ #else if (setjmp(env)) return FALSE; if ((timint > MAXTIM) || (timint < MINTIM)) timint = MYTIME; cntdn = timint * 10; #define read(a,b,c) xread(b,c) #endif while (t != SOH) /* Wait for packet header */ { read(ttyfd,&t,1); t &= 0177; /* Handle parity */ } done = FALSE; /* Got SOH, init loop */ while (!done) /* Loop to get a packet */ { read(ttyfd,&t,1); /* Get character */ if (!image) t &= 0177; /* Handle parity */ if (t == SOH) continue; /* Resynchronize if SOH */ cchksum = t; /* Start the checksum */ *len = unchar(t)-3; /* Character count */ read(ttyfd,&t,1); /* Get character */ if (!image) t &= 0177; /* Handle parity */ if (t == SOH) continue; /* Resynchronize if SOH */ cchksum = cchksum + t; /* Update checksum */ *num = unchar(t); /* Packet number */ read(ttyfd,&t,1); /* Get character */ if (!image) t &= 0177; /* Handle parity */ if (t == SOH) continue; /* Resynchronize if SOH */ cchksum = cchksum + t; /* Update checksum */ type = t; /* Packet type */ for (i=0; i<*len; i++) /* The data itself, if any */ { /* Loop for character count */ read(ttyfd,&t,1); /* Get character */ if (!image) t &= 0177; /* Handle parity */ if (t == SOH) continue; /* Resynch if SOH */ cchksum = cchksum + t; /* Update checksum */ data[i] = t; /* Put it in the data buffer */ } data[*len] = 0; /* Mark the end of the data */ read(ttyfd,&t,1); /* Get last character (checksum) */ rchksum = unchar(t); /* Convert to numeric */ read(ttyfd,&t,1); /* get EOL character and toss it */ if (!image) t &= 0177; /* Handle parity */ if (t == SOH) continue; /* Resynchronize if SOH */ done = TRUE; /* Got checksum, done */ } #ifdef unix #if UCB4X alarm(0); /* Disable the timer interrupt */ #endif #else cntdn = 0; #undef read #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 */ } /* * 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. */ #ifndef unix static #endif 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 = t & 0177; /* Get low order 7 bits */ if (t7 < SP || t7==DEL || t7==quote) /* Does this char require */ { /* special handling? */ #ifdef unix if (t=='\n' && !image) { /* Do LF->CRLF mapping if !image */ buffer[i++] = quote; buffer[i++] = ctl('\r'); } #endif buffer[i++] = quote; /* Quote the character */ if (t7 != quote) { t = ctl(t); /* and uncontrolify */ t7 = ctl(t7); } } if (image) 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. */ #ifndef unix static #endif bufemp(buffer,len) char buffer[]; /* Buffer */ int len; /* Length */ { int i; /* Counter */ char t; /* Character holder */ for (i=0; i