Internet Info 1994 March

home *** CD-ROM | disk | FTP | other *** search

/ Internet Info 1994 March / Internet Info CD-ROM (Walnut Creek) (March 1994).iso / networking / terms / kermit / c / cie680.c < prev next >

Wrap

C/C++ Source or Header | 1988-08-16 | 45.8 KB | 1,285 lines

/* * K e r m i t File Transfer Utility (in the C Programming Language) * * 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 * David Lawyer, UCI l986 * Keith Justice, UCI l986 * * 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. dd=more verbose debugging. * * For remote Kermit, format is either: * kermit r to receive files * or kermit s file ... to send files * * A useful book: "Advanced Unix Programming" by Marc J. Rochkind, 1985. * * * History of Porting to the CIE: * * Changes made are commented using only leading "//". * 1986: May 23: Modified so as to be compatable with the CIE micro. * -Added #include <ucb/sys/ttydev.h> for speeds B1200 etc. * -Cast pointer subtraction results to integer (int) in: * 1. sfile() 2. spack(...) in call of write(...) * -Changed name to CIE_Kermit: in printmsg(...) * June: Modified Connect so that it works much faster. Made * read non-blocking and read remote up to 80 ch. at a time. * * Dec.: Changed Berkeley stty and gtty to Regulus (almost like * System III) ioctl calls via function setraw. Changed many * 0's to null pointers (long integers). Did casting as indi- * cated by lint. Deleted various options for non-CIE systems * except for UCB4X which the CIE is assumed to be like, although * changes to the program have hopefully been made where there * is a difference between UCB4X and the CIE. * * How to COMPILE: * No flags are * needed for compiling, although one might use the flag for * system III: -ls3. The command for compiling which I used: * cc -v -o kerm.c */ #include <stdio.h> /* Standard UNIX definitions */ #define UCB4X 1 /* Berkeley 4.x UNIX */ //dsl added #includes #include <fcntl.h> //defines pars to open and fcntl #include <sys/ioctl.h> //Regulus ioctl #include <termio.h> // Regulus termio structure see tty(dev) #include <signal.h> #include <setjmp.h> /* 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 */ 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 */ linefd, /* 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 */ 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 */ FILE *fp, /* File pointer for current disk file */ *log; /* File pointer for Logfile */ 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 *linename, /* tty name for LINE argument */ *cp; /* char pointer */ int speed, /* speed of assigned tty, */ cflg, rflg, sflg; /* flags for CONNECT, RECEIVE, SEND */ struct termio ttyrawmode, /* Controlling tty raw mode */ ttycookmode, /* Controlling tty cooked mode */ linemode; /* mode of tty line in LINE option */ 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 = '\0'; // use null if any padding wanted speed = cflg = sflg = rflg = 0; /* Turn off all parse flags */ linename = 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 */ image = TRUE; break; /* (this is default for non-UNIX) */ case 'l': /* L = specify tty line to use */ if (argc--) linename = *argv++; else usage(); if (debug) printf("Line to remote host is %s\n",linename); 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 (argc--) speed = atoi(*argv++); else usage(); if (debug) printf("Line speed to remote host is %d\n",speed); break; } /* Done parsing */ if ((cflg+sflg+rflg) != 1) /* Only one command allowed */ usage(); if (linename) /* If LINE was specified, we */ { /* operate in local mode */ linefd = open( linename, O_RDWR|O_NDELAY ); //read/write & nonblock if (linefd== -1) { printmsg("Cannot open %s",linename); exit(1); } remote = FALSE; /* Indicate we're in local mode */ } else /* No LINE specified so we operate */ { /* in remote mode (ie. controlling */ linefd = 0; /* tty is the communications line) */ remote = TRUE; } /* Put the proper tty line into the correct mode */ if (remote) /* If remote, use controlling tty */ { ioctl(0,&ttycookmode); /* Save current mode so we can */ ioctl(0,&ttyrawmode); /* restore it later */ setraw(0,&linemode); // Put remote tty into raw mode } else /* Local, use assigned line */ { ioctl(linefd,TCGETA,&linemode); // Get line tty mode (attributes) setraw(linefd, &linemode); // Put line tty into raw mode if (speed) /* User specified a speed? */ { switch(speed) /* Get internal system code */ { 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; case 19200: speed = EXTA; break; default: printmsg("Bad line speed."); exit(1); } linemode.c_cflag &= ~CBAUD; linemode.c_cflag |= speed; } ioctl(linefd,TCSETA,&linemode); // Put line tty in raw mode } /* 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 { if (remote) ioctl(0,&ttycookmode); /* 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 */ } if (remote) ioctl(0,TCSETA,&ttycookmode);//Restore controlling tty mode } /* * 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 */ 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 (numtry++ > MAXTRY) return('A'); /* If too many tries, give up */ spar(packet); /* Fill up init info packet */ ioctl(linefd, TCFLSH, 0); /* 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 (*cp >= 'a' && *cp <= 'z') *cp ^= 040; //&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& len = (int) (cp - newfilnam); // Compute length of new filename // long pointer cast to int by dsl 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,NULL); /* 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,NULL); 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,NULL); /* 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,NULL); /* 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,NULL); /* 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,NULL); /* 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,NULL); /* 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,NULL); /* 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,NULL); /* 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. The buffer (buf[..]) size affects the per- * formance and the optimal size has not been determined. If too * large the scrolling is jerky at 9600 baud. If too small it * is slow due to the overhad costs of too many calls to read or * write. If its over 512 bytes (the approximate size of the kernal * read or write buffer size (2 buffers), then errors occur. * */ connect() { int no_bytes, // No. of bytes in buffer to xfer connected; /* Boolean connect flag */ char bel = '\07', buf[80], // Bell. Buffer for reading remote. c; struct termio ttyrawmode, /* Controlling tty raw mode */ ttycookmode; /* Controlling tty cooked mode */ if (remote) /* Nothing to connect to in remote */ { /* mode, so just return */ printmsg("No line specified for connection."); return; } ioctl(0,TCGETA,&ttycookmode); /* Save current mode so we can */ ioctl(0,TCGETA,&ttyrawmode); // Get existing mode to modify setraw(0, &ttyrawmode); // Put your tty in raw mode fcntl(linefd, F_SETFL, O_NDELAY); // Makes reads of line non-blocking fcntl(0, F_SETFL, O_NDELAY); // Makes reads of tty non-blocking // See fcntl(sys) printmsg("Connected to UCI data switch.\r"); connected = TRUE; /* Put us in "connect mode" */ while (connected) { if(read(0,&c,1)==1) // Try to get a char. (non-blocking) { if ((c&0177) == escchr) /* Check for escape character */ { fcntl(0,F_SETFL,02); // Turn off O_NDELAY: make blocking read(0,&c,1); fcntl(0,F_SETFL,O_NDELAY); // Makes reads non-blocking if ((c&0177) == escchr) write(linefd,&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(linefd,&c,1); // Write it to remote computer } } // end of outer if part else if (no_bytes = read(linefd,&buf,80) ) //Try to read remote write(1,&buf,no_bytes); //Write it to local tty //Writes only if no_bytes != 0 } //end of while loop fcntl(0,F_SETFL,02); // Turn off O_NDELAY: make blocking ioctl(0,TCSETAW,&ttycookmode); // Restore tty mode printmsg("Disconnected from UCI data switch."); return; /* Done */ } /* * KERMIT utilities. */ 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 */ { printf("In spack"); 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(linefd,&padchar,1); /* Issue any padding */ *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<len; i++) /* Loop for all data characters */ { *bufp++ = data[i]; /* Get a character */ chksum += data[i]; /* Update checksum */ } chksum = (((chksum&0300) >> 6)+chksum)&077; /* Compute final checksum */ *bufp++ = tochar(chksum); /* Put it in the packet */ *bufp = eol; /* Extra-packet line terminator */ write(linefd, buffer, (int)(bufp - buffer + 1) ); //Send the packet } // 3rd arg cast to int by dsl //&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& /* * 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 */ cchksum, /* Our (computed) checksum */ rchksum; /* Checksum received from other host */ if (setjmp(env)) return FALSE; /* Timed out, fail */ signal(SIGALRM,clkint); /* Setup the timeout */ if ((timint > MAXTIM) || (timint < MINTIM)) timint = MYTIME; alarm(timint); while (t != SOH) /* Wait for packet header */ { read(linefd,&t,1); t &= 0177; /* Handle parity */ } done = FALSE; /* Got SOH, init loop */ while (!done) /* Loop to get a packet */ { read(linefd,&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(linefd,&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(linefd,&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(linefd,&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(linefd,&t,1); /* Get last character (checksum) */ rchksum = unchar(t); /* Convert to numeric */ read(linefd,&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 */ } #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 */ } /* * 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 = t & 0177; /* 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 (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. */ bufemp(buffer,len) char buffer[]; /* Buffer */ int len; /* Length */ { int i; /* Counter */ char t; /* Character holder */ for (i=0; i<len; i++) /* Loop thru the data field */ { t = buffer[i]; /* Get character */ if (t == MYQUOTE) /* Control quote? */ { /* Yes */ t = buffer[++i]; /* Get the quoted character */ if ((t & 0177) != MYQUOTE) /* Low order bits match quote char? */ t = ctl(t); /* No, uncontrollify it */ } if (t==CR && !image) /* Don't pass CR if in image mode */ continue; putc(t,fp); } } /* * g n x t f l * * Get next file in a file group */ gnxtfl() { if (debug) printf(" gnxtfl: filelist = \"%s\"\n",*filelist); filnam = *(filelist++); if (filecount-- == 0) return FALSE; /* If no more, fail */ else return TRUE; /* else succeed */ } /* * s p a r * * Fill the data array with my send-init parameters * */ spar(data) char data[]; { data[0] = tochar(MAXPACKSIZ); /* Biggest packet I can receive */ data[1] = tochar(MYTIME); /* When I want to be timed out */ data[2] = tochar(MYPAD); /* How much padding I need */ data[3] = ctl(MYPCHAR); /* Padding character I want */ data[4] = tochar(MYEOL); /* End-Of-Line character I want */ data[5] = MYQUOTE; /* Control-Quote character I send */ } /* r p a r * * Get the other host's send-init parameters * */ rpar(data) char data[]; { spsiz = unchar(data[0]); /* Maximum send packet size */ timint = unchar(data[1]); /* When I should time out */ pad = unchar(data[2]); /* Number of pads to send */ padchar = ctl(data[3]); /* Padding character to send */ eol = unchar(data[4]); /* EOL character I must send */ quote = data[5]; /* Incoming data quote character */ } /* * s e t r a w * * Puts a specified tty interface (or line interface via a tty port) * into raw mode. See the help file (manual) tty (dev) for an * explanation of the ioctl system call and the termio structure. * They are almost the same as for Unix System III. Unsetting * (disabling) the symbolic constant flags ISTRIP and OPOST * resulted in ^Q from the keyboard not restarting stopped output. * Although they should be disabled for raw mode per various * sources, they were not due to this problem. The line disipline * LD_FILXFR would not work so it was not used. */ setraw(ttyfd, ttymode) struct termio *ttymode; int ttyfd; { if( ioctl( ttyfd , TCGETA, ttymode) ) // Get ttymode to modify printmsg("Error getting ttymode"); ttymode->c_iflag &= ~(BRKINT | ICRNL ); ttymode->c_oflag &= ~(TAB3 | ONLCR ); ttymode->c_lflag &= ~(ISIG|ECHO|ICANON); ttymode->c_cc[4] = 1; // min # of chars ttymode->c_cc[5] = 0; // timeout of reads if( ioctl( ttyfd, TCSETAF, ttymode) ) // put ttyfd in raw mode printmsg("Error in setraw() ioctl. Line/tty not put in raw mode."); } //-------------------------------------------------------------------------- /* * Kermit printing routines: * * usage - print command line options showing proper syntax * printmsg - like printf with "Kermit: " prepended * error - like printmsg if local kermit; sends a error packet if remote * prerrpkt - print contents of error packet received from remote host */ /* * u s a g e * * Print summary of usage info and quit */ usage() { #if UCB4X printf("Usage: kermit c[lbe line baud esc.char] (connect mode)\n"); printf("or: kermit s[diflb line baud] file ... (send mode)\n"); printf("or: kermit r[diflb line baud] (receive mode)\n"); #else printf("Usage: kermit c[le line esc.char] (connect mode)\n"); printf("or: kermit s[difl line] file ... (send mode)\n"); printf("or: kermit r[difl line] (receive mode)\n"); #endif exit(1); } /* * p r i n t m s g * * Print message on standard output if not remote. */ /*VARARGS1*/ printmsg(fmt, a1, a2, a3, a4, a5) char *fmt; { if (!remote) { printf("CIE_Kermit: "); printf(fmt,a1,a2,a3,a4,a5); printf("\n"); fflush(stdout); /* force output (UTS needs it) */ } } /* * e r r o r * * Print error message. * * If local, print error message with printmsg. * If remote, send an error packet with the message. */ /*VARARGS1*/ error(fmt, a1, a2, a3, a4, a5) char *fmt; { char msg[80]; int len; if (remote) { sprintf(msg,fmt,a1,a2,a3,a4,a5); /* Make it a string */ len = strlen(msg); spack('E',n,len,msg); /* Send the error packet */ } else printmsg(fmt, a1, a2, a3, a4, a5); return; } /* * p r e r r p k t * * Print contents of error packet received from remote host. */ prerrpkt(msg) char *msg; { printf("Kermit aborting with following error from remote host:\n%s\n",msg); return; }