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Diffstat (limited to 'contrib/tftp/tftpsubs.c')
| -rw-r--r-- | contrib/tftp/tftpsubs.c | 260 |
1 files changed, 0 insertions, 260 deletions
diff --git a/contrib/tftp/tftpsubs.c b/contrib/tftp/tftpsubs.c deleted file mode 100644 index 608d64ec..00000000 --- a/contrib/tftp/tftpsubs.c +++ /dev/null @@ -1,260 +0,0 @@ -/* - * Copyright (c) 1983 Regents of the University of California. - * All rights reserved. - * - * Redistribution and use in source and binary forms are permitted - * provided that the above copyright notice and this paragraph are - * duplicated in all such forms and that any documentation, - * advertising materials, and other materials related to such - * distribution and use acknowledge that the software was developed - * by the University of California, Berkeley. The name of the - * University may not be used to endorse or promote products derived - * from this software without specific prior written permission. - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED - * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. - */ - -#ifndef lint -static char sccsid[] = "@(#)tftpsubs.c 5.4 (Berkeley) 6/29/88"; -#endif /* not lint */ - -/* Simple minded read-ahead/write-behind subroutines for tftp user and - server. Written originally with multiple buffers in mind, but current - implementation has two buffer logic wired in. - - Todo: add some sort of final error check so when the write-buffer - is finally flushed, the caller can detect if the disk filled up - (or had an i/o error) and return a nak to the other side. - - Jim Guyton 10/85 - */ - -#include <errno.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <sys/ioctl.h> -#include <netinet/in.h> -#include <arpa/tftp.h> -#include <stdio.h> - -#define PKTSIZE (1432+4) /* SEGSIZE+4 */ /* should be moved to tftp.h */ - -struct bf { - int counter; /* size of data in buffer, or flag */ - char buf[PKTSIZE]; /* room for data packet */ -} bfs[2]; - - /* Values for bf.counter */ -#define BF_ALLOC -3 /* alloc'd but not yet filled */ -#define BF_FREE -2 /* free */ -/* [-1 .. SEGSIZE] = size of data in the data buffer */ - -extern int segsize; - -static int nextone; /* index of next buffer to use */ -static int current; /* index of buffer in use */ - - /* control flags for crlf conversions */ -int newline = 0; /* fillbuf: in middle of newline expansion */ -int prevchar = -1; /* putbuf: previous char (cr check) */ - -struct tftphdr *rw_init(); - -struct tftphdr *w_init() { return rw_init(0); } /* write-behind */ -struct tftphdr *r_init() { return rw_init(1); } /* read-ahead */ - -struct tftphdr * -rw_init(x) /* init for either read-ahead or write-behind */ -int x; /* zero for write-behind, one for read-head */ -{ - newline = 0; /* init crlf flag */ - prevchar = -1; - bfs[0].counter = BF_ALLOC; /* pass out the first buffer */ - current = 0; - bfs[1].counter = BF_FREE; - nextone = x; /* ahead or behind? */ - return (struct tftphdr *)bfs[0].buf; -} - - -/* Have emptied current buffer by sending to net and getting ack. - Free it and return next buffer filled with data. - */ -readit(file, dpp, convert) - FILE *file; /* file opened for read */ - struct tftphdr **dpp; - int convert; /* if true, convert to ascii */ -{ - struct bf *b; - - bfs[current].counter = BF_FREE; /* free old one */ - current = !current; /* "incr" current */ - - b = &bfs[current]; /* look at new buffer */ - if (b->counter == BF_FREE) /* if it's empty */ - read_ahead(file, convert); /* fill it */ -/* assert(b->counter != BF_FREE); /* check */ - *dpp = (struct tftphdr *)b->buf; /* set caller's ptr */ - return b->counter; -} - -/* - * fill the input buffer, doing ascii conversions if requested - * conversions are lf -> cr,lf and cr -> cr, nul - */ -read_ahead(file, convert) - FILE *file; /* file opened for read */ - int convert; /* if true, convert to ascii */ -{ - register int i; - register char *p; - register int c; - struct bf *b; - struct tftphdr *dp; - - b = &bfs[nextone]; /* look at "next" buffer */ - if (b->counter != BF_FREE) /* nop if not free */ - return; - nextone = !nextone; /* "incr" next buffer ptr */ - - dp = (struct tftphdr *)b->buf; - - if (convert == 0) { - int i; - b->counter = 0; - do { - i = read(fileno(file), dp->th_data + b->counter, - segsize - b->counter); - if (i > 0) - b->counter += i; - } while (i != 0 && !(i < 0 && errno != EINTR) && - b->counter < segsize); - return; - } - - p = dp->th_data; - for (i = 0 ; i < segsize; i++) { - if (newline) { - if (prevchar == '\n') - c = '\n'; /* lf to cr,lf */ - else c = '\0'; /* cr to cr,nul */ - newline = 0; - } - else { - c = getc(file); - if (c == EOF) break; - if (c == '\n' || c == '\r') { - prevchar = c; - c = '\r'; - newline = 1; - } - } - *p++ = c; - } - b->counter = (int)(p - dp->th_data); -} - -/* Update count associated with the buffer, get new buffer - from the queue. Calls write_behind only if next buffer not - available. - */ -writeit(file, dpp, ct, convert) - FILE *file; - struct tftphdr **dpp; - int convert; -{ - bfs[current].counter = ct; /* set size of data to write */ - current = !current; /* switch to other buffer */ - if (bfs[current].counter != BF_FREE) /* if not free */ - write_behind(file, convert); /* flush it */ - bfs[current].counter = BF_ALLOC; /* mark as alloc'd */ - *dpp = (struct tftphdr *)bfs[current].buf; - return ct; /* this is a lie of course */ -} - -/* - * Output a buffer to a file, converting from netascii if requested. - * CR,NUL -> CR and CR,LF => LF. - * Note spec is undefined if we get CR as last byte of file or a - * CR followed by anything else. In this case we leave it alone. - */ -write_behind(file, convert) - FILE *file; - int convert; -{ - char *buf; - int count; - register int ct; - register char *p; - register int c; /* current character */ - struct bf *b; - struct tftphdr *dp; - - b = &bfs[nextone]; - if (b->counter < -1) /* anything to flush? */ - return 0; /* just nop if nothing to do */ - - count = b->counter; /* remember byte count */ - b->counter = BF_FREE; /* reset flag */ - dp = (struct tftphdr *)b->buf; - nextone = !nextone; /* incr for next time */ - buf = dp->th_data; - - if (count <= 0) return -1; /* nak logic? */ - - if (convert == 0) - return write(fileno(file), buf, count); - - p = buf; - ct = count; - while (ct--) { /* loop over the buffer */ - c = *p++; /* pick up a character */ - if (prevchar == '\r') { /* if prev char was cr */ - if (c == '\n') /* if have cr,lf then just */ - fseek(file, -1, 1); /* smash lf on top of the cr */ - else - if (c == '\0') /* if have cr,nul then */ - goto skipit; /* just skip over the putc */ - /* else just fall through and allow it */ - } - putc(c, file); -skipit: - prevchar = c; - } - return count; -} - - -/* When an error has occurred, it is possible that the two sides - * are out of synch. Ie: that what I think is the other side's - * response to packet N is really their response to packet N-1. - * - * So, to try to prevent that, we flush all the input queued up - * for us on the network connection on our host. - * - * We return the number of packets we flushed (mostly for reporting - * when trace is active). - */ - -int -synchnet(f) -int f; /* socket to flush */ -{ - int i, j = 0; - char rbuf[PKTSIZE]; - struct sockaddr_in from; - int fromlen; - - while (1) { - (void) ioctl(f, FIONREAD, &i); - if (i) { - j++; - fromlen = sizeof from; - (void) recvfrom(f, rbuf, sizeof (rbuf), 0, - (struct sockaddr *)&from, &fromlen); - } else { - return(j); - } - } -} |