260 lines
6.7 KiB
C
260 lines
6.7 KiB
C
/* $OpenBSD: getline.c,v 1.16 2004/09/16 04:50:51 deraadt Exp $ */
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/*
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* Copyright (c) 1985, 1988 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ftpcmd.y 5.24 (Berkeley) 2/25/91
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/telnet.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sysexits.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "util.h"
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int refill_buffer(struct csiob *iobp);
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/*
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* Refill the io buffer if we KNOW that data is available
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*
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* Returns 1 if any new data was obtained, 0 otherwise.
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*/
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int
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refill_buffer(struct csiob *iobp)
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{
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int rqlen, rlen;
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if (!(iobp->data_available))
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return(0);
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if (iobp->got_eof)
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return(0);
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/*
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* The buffer has been entirely consumed if next_byte == io_buffer_len.
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* Otherwise, there is some still-to-be-used data in io_buffer.
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* Shuffle it to the start of the buffer.
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* Note that next_byte will never exceed io_buffer_len.
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* Also, note that we MUST use bcopy because the two regions could
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* overlap (memcpy isn't defined to work properly with overlapping
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* regions).
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*/
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if (iobp->next_byte < iobp->io_buffer_len) {
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int dst_ix = 0;
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int src_ix = iobp->next_byte;
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int amount = iobp->io_buffer_len - iobp->next_byte;
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bcopy(&iobp->io_buffer[src_ix], &iobp->io_buffer[dst_ix],
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amount);
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iobp->io_buffer_len = amount;
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} else if (iobp->next_byte == iobp->io_buffer_len)
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iobp->io_buffer_len = 0;
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else {
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syslog(LOG_ERR, "next_byte(%d) > io_buffer_len(%d)",
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iobp->next_byte, iobp->io_buffer_len);
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exit(EX_OSERR);
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}
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iobp->next_byte = 0;
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/* don't do tiny reads, grow first if we need to */
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rqlen = iobp->io_buffer_size - iobp->io_buffer_len;
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if (rqlen <= 128) {
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unsigned char *tmp;
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iobp->io_buffer_size += 128;
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tmp = realloc(iobp->io_buffer, iobp->io_buffer_size);
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if (tmp == NULL) {
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syslog(LOG_INFO, "Insufficient memory");
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exit(EX_UNAVAILABLE);
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}
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iobp->io_buffer = tmp;
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rqlen = iobp->io_buffer_size - iobp->io_buffer_len;
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}
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/*
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* Always leave an unused byte at the end of the buffer
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* because the debug output uses that byte from time to time
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* to ensure that something that is being printed is \0 terminated.
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*/
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rqlen -= 1;
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doread:
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rlen = read(iobp->fd, &iobp->io_buffer[iobp->io_buffer_len], rqlen);
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iobp->data_available = 0;
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switch (rlen) {
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case -1:
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if (errno == EAGAIN || errno == EINTR)
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goto doread;
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if (errno != ECONNRESET) {
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syslog(LOG_INFO, "read() failed on socket from %s (%m)",
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iobp->who);
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exit(EX_DATAERR);
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}
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/* fall through to EOF case */
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case 0:
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iobp->got_eof = 1;
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return(0);
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break;
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default:
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iobp->io_buffer_len += rlen;
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break;
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}
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return(1);
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}
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/*
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* telnet_getline - a hacked up version of fgets to ignore TELNET escape codes.
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*
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* This code is derived from the getline routine found in the UC Berkeley
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* ftpd code.
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*
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*/
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int
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telnet_getline(struct csiob *iobp, struct csiob *telnet_passthrough)
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{
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unsigned char ch;
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int ix;
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unsigned char tbuf[100];
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iobp->line_buffer[0] = '\0';
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/*
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* If the buffer is empty then refill it right away.
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*/
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if (iobp->next_byte == iobp->io_buffer_len)
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if (!refill_buffer(iobp))
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return(0);
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/*
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* Is there a telnet command in the buffer?
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*/
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ch = iobp->io_buffer[iobp->next_byte];
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if (ch == IAC) {
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/*
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* Yes - buffer must have at least three bytes in it
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*/
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if (iobp->io_buffer_len - iobp->next_byte < 3) {
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if (!refill_buffer(iobp))
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return(0);
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if (iobp->io_buffer_len - iobp->next_byte < 3)
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return(0);
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}
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iobp->next_byte++;
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ch = iobp->io_buffer[iobp->next_byte++];
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switch (ch) {
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case WILL:
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case WONT:
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case DO:
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case DONT:
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tbuf[0] = IAC;
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tbuf[1] = ch;
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tbuf[2] = iobp->io_buffer[iobp->next_byte++];
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(void)send(telnet_passthrough->fd, tbuf, 3,
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telnet_passthrough->send_oob_flags);
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break;
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case IAC:
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break;
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default:
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break;
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}
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return(1);
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} else {
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int clen;
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/*
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* Is there a newline in the buffer?
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*/
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for (ix = iobp->next_byte; ix < iobp->io_buffer_len;
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ix += 1) {
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if (iobp->io_buffer[ix] == '\n')
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break;
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if (iobp->io_buffer[ix] == '\0') {
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syslog(LOG_INFO,
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"got NUL byte from %s - bye!",
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iobp->who);
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exit(EX_DATAERR);
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}
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}
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if (ix == iobp->io_buffer_len) {
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if (!refill_buffer(iobp))
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return(0);
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/*
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* Empty line returned
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* will try again soon!
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*/
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return(1);
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}
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/*
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* Expand the line buffer if it isn't big enough. We
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* use a fudge factor of 5 rather than trying to
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* figure out exactly how to account for the '\0 \r\n' and
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* such. The correct fudge factor is 0, 1 or 2 but
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* anything higher also works. We also grow it by a
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* bunch to avoid having to do this often. Yes this is
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* nasty.
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*/
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if (ix - iobp->next_byte > iobp->line_buffer_size - 5) {
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unsigned char *tmp;
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iobp->line_buffer_size = 256 + ix - iobp->next_byte;
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tmp = realloc(iobp->line_buffer,
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iobp->line_buffer_size);
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if (tmp == NULL) {
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syslog(LOG_INFO, "Insufficient memory");
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exit(EX_UNAVAILABLE);
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}
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iobp->line_buffer = tmp;
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}
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/* +1 is for the newline */
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clen = (ix+1) - iobp->next_byte;
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memcpy(iobp->line_buffer, &iobp->io_buffer[iobp->next_byte],
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clen);
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iobp->next_byte += clen;
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iobp->line_buffer[clen] = '\0';
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return(1);
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}
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}
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