/* * Copyright (c) 1985, 1988 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ftpcmd.y 5.24 (Berkeley) 2/25/91 */ /* * RCS information: * $Id: getline.c,v 1.2 2001/08/19 13:43:09 deraadt Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include "util.h" /* * Refill the io buffer if we KNOW that data is available * * Returns 1 if any new data was obtained, 0 otherwise. */ int refill_buffer(register struct csiob *iobp) { int rqlen, rlen; if (!(iobp->data_available)) return(0); if (iobp->got_eof) return(0); /* * The buffer has been entirely consumed if next_byte == io_buffer_len. * Otherwise, there is some still-to-be-used data in io_buffer. * Shuffle it to the start of the buffer. * Note that next_byte will never exceed io_buffer_len. * Also, note that we MUST use bcopy because the two regions could * overlap (memcpy isn't defined to work properly with overlapping * regions). */ if (iobp->next_byte < iobp->io_buffer_len) { register int dst_ix, src_ix; register int amount; dst_ix = 0; src_ix = iobp->next_byte; amount = iobp->io_buffer_len - iobp->next_byte; bcopy(&iobp->io_buffer[src_ix], &iobp->io_buffer[dst_ix], amount); iobp->io_buffer_len = amount; } else if (iobp->next_byte == iobp->io_buffer_len) iobp->io_buffer_len = 0; else { syslog(LOG_ERR, "next_byte(%d) > io_buffer_len(%d)\n", iobp->next_byte, iobp->io_buffer_len); exit(EX_OSERR); } iobp->next_byte = 0; /* don't do tiny reads, grow first if we need to */ rqlen = iobp->io_buffer_size - iobp->io_buffer_len; if (rqlen <= 128) { char * tmp; iobp->io_buffer_size += 128; tmp = realloc(iobp->io_buffer, iobp->io_buffer_size); if (tmp == NULL) return(0); iobp->io_buffer = tmp; rqlen = iobp->io_buffer_size - iobp->io_buffer_len; } /* * Always leave an unused byte at the end of the buffer * because the debug output uses that byte from time to time * to ensure that something that is being printed is \0 terminated. */ rqlen -= 1; doread: rlen = read(iobp->fd, &iobp->io_buffer[iobp->io_buffer_len], rqlen); iobp->data_available = 0; switch (rlen) { case -1: if (errno == EAGAIN || errno == EINTR) goto doread; if (errno != ECONNRESET) { syslog(LOG_INFO, "read failed on socket from %s (%m)", iobp->who); exit(EX_DATAERR); } /* fall through to EOF case */ case 0: iobp->got_eof = 1; return(0); break; default: iobp->io_buffer_len += rlen; } return(1); } /* * telnet_getline - a hacked up version of fgets to ignore TELNET escape codes. * * This code is derived from the getline routine found in the UC Berkeley * ftpd code. */ int telnet_getline(register struct csiob *iobp, struct csiob *telnet_passthrough) { unsigned char ch; register int ix; char tbuf[100]; iobp->line_buffer[0] = '\0'; /* * If the buffer is empty then refill it right away. */ if (iobp->next_byte == iobp->io_buffer_len) if (!refill_buffer(iobp)) return(0); /* * Is there a telnet command in the buffer? */ ch = iobp->io_buffer[iobp->next_byte]; if (ch == IAC) { /* * Yes - buffer must have at least three bytes in it */ if (iobp->io_buffer_len - iobp->next_byte < 3) { if (!refill_buffer(iobp)) return(0); if (iobp->io_buffer_len - iobp->next_byte < 3) return(0); } iobp->next_byte++; ch = iobp->io_buffer[iobp->next_byte++]; switch (ch) { case WILL: case WONT: case DO: case DONT: tbuf[0] = IAC; tbuf[1] = ch; tbuf[2] = iobp->io_buffer[iobp->next_byte++]; (void)send(telnet_passthrough->fd,tbuf,3, telnet_passthrough->send_oob_flags); break; case IAC: break; default: break; } return(1); } else { int clen; /* * Is there a newline in the buffer? */ for (ix = iobp->next_byte; ix < iobp->io_buffer_len; ix += 1) { if (iobp->io_buffer[ix] == '\n') break; if (iobp->io_buffer[ix] == '\0') { syslog(LOG_INFO, "got null byte from %s - bye!\n", iobp->who); exit(EX_DATAERR); } } if (ix == iobp->io_buffer_len) { if (!refill_buffer(iobp)) return(0); /* * Empty line returned * will try again soon! */ return(1); } /* * Expand the line buffer if it isn't big enough. We * use a fudge factor of 5 rather than trying to * figure out exactly how to account for the '\0 \r\n' and * such. The correct fudge factor is 0, 1 or 2 but * anything higher also works. We also grow it by a * bunch to avoid having to do this often. Yes this is * nasty. */ if (ix - iobp->next_byte > iobp->line_buffer_size - 5) { char * tmp; iobp->line_buffer_size = 256 + ix - iobp->next_byte; tmp = realloc(iobp->line_buffer, iobp->line_buffer_size); if (tmp == NULL) return(0); iobp->line_buffer = tmp; } /* +1 is for the newline */ clen = (ix+1) - iobp->next_byte; memcpy(iobp->line_buffer, &iobp->io_buffer[iobp->next_byte], clen); iobp->next_byte += clen; iobp->line_buffer[clen] = '\0'; return(1); } }