mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-11 21:48:50 +01:00
788a9bc51f
* assuan-buffer.c (_assuan_read_line): New variable ATTICLEN, use it to save the number of bytes left over after the complete line. Rediddle the code a bit to make it more clear what happens.
363 lines
8.5 KiB
C
363 lines
8.5 KiB
C
/* assuan-buffer.c - read and send data
|
||
* Copyright (C) 2001 Free Software Foundation, Inc.
|
||
*
|
||
* This file is part of GnuPG.
|
||
*
|
||
* GnuPG is free software; you can redistribute it and/or modify
|
||
* it under the terms of the GNU General Public License as published by
|
||
* the Free Software Foundation; either version 2 of the License, or
|
||
* (at your option) any later version.
|
||
*
|
||
* GnuPG is distributed in the hope that it will be useful,
|
||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
* GNU General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU General Public License
|
||
* along with this program; if not, write to the Free Software
|
||
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
||
*/
|
||
|
||
#include <config.h>
|
||
#include <stdlib.h>
|
||
#include <stdio.h>
|
||
#include <errno.h>
|
||
#include <unistd.h>
|
||
#include <assert.h>
|
||
|
||
#include "assuan-defs.h"
|
||
|
||
|
||
static int
|
||
writen ( int fd, const char *buffer, size_t length )
|
||
{
|
||
while (length)
|
||
{
|
||
int nwritten = write (fd, buffer, length);
|
||
|
||
if (nwritten < 0)
|
||
{
|
||
if (errno == EINTR)
|
||
continue;
|
||
return -1; /* write error */
|
||
}
|
||
length -= nwritten;
|
||
buffer += nwritten;
|
||
}
|
||
return 0; /* okay */
|
||
}
|
||
|
||
/* read an entire line */
|
||
static int
|
||
readline (int fd, char *buf, size_t buflen, int *r_nread, int *eof)
|
||
{
|
||
size_t nleft = buflen;
|
||
char *p;
|
||
|
||
*eof = 0;
|
||
*r_nread = 0;
|
||
while (nleft > 0)
|
||
{
|
||
int n = read (fd, buf, nleft);
|
||
if (n < 0)
|
||
{
|
||
if (errno == EINTR)
|
||
continue;
|
||
return -1; /* read error */
|
||
}
|
||
else if (!n)
|
||
{
|
||
*eof = 1;
|
||
break; /* allow incomplete lines */
|
||
}
|
||
p = buf;
|
||
nleft -= n;
|
||
buf += n;
|
||
*r_nread += n;
|
||
|
||
for (; n && *p != '\n'; n--, p++)
|
||
;
|
||
if (n)
|
||
break; /* at least one full line available - that's enough for now */
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
int
|
||
_assuan_read_line (ASSUAN_CONTEXT ctx)
|
||
{
|
||
char *line = ctx->inbound.line;
|
||
int n, nread, atticlen;
|
||
int rc;
|
||
|
||
if (ctx->inbound.eof)
|
||
return -1;
|
||
|
||
atticlen = ctx->inbound.attic.linelen;
|
||
if (atticlen)
|
||
{
|
||
memcpy (line, ctx->inbound.attic.line, atticlen);
|
||
ctx->inbound.attic.linelen = 0;
|
||
for (n=0; n < atticlen && line[n] != '\n'; n++)
|
||
;
|
||
if (n < atticlen)
|
||
{
|
||
rc = 0; /* found another line in the attic */
|
||
nread = atticlen;
|
||
atticlen = 0;
|
||
}
|
||
else
|
||
{ /* read the rest */
|
||
assert (atticlen < LINELENGTH);
|
||
rc = readline (ctx->inbound.fd, line + atticlen,
|
||
LINELENGTH - atticlen, &nread, &ctx->inbound.eof);
|
||
}
|
||
}
|
||
else
|
||
rc = readline (ctx->inbound.fd, line, LINELENGTH,
|
||
&nread, &ctx->inbound.eof);
|
||
if (rc)
|
||
return ASSUAN_Read_Error;
|
||
if (!nread)
|
||
{
|
||
assert (ctx->inbound.eof);
|
||
return -1;
|
||
}
|
||
|
||
ctx->inbound.attic.pending = 0;
|
||
nread += atticlen;
|
||
for (n=0; n < nread; n++)
|
||
{
|
||
if (line[n] == '\n')
|
||
{
|
||
if (n+1 < nread)
|
||
{
|
||
char *s, *d;
|
||
int i;
|
||
|
||
n++;
|
||
/* we have to copy the rest because the handlers are
|
||
allowed to modify the passed buffer */
|
||
for (d=ctx->inbound.attic.line, s=line+n, i=nread-n; i; i--)
|
||
{
|
||
if (*s=='\n')
|
||
ctx->inbound.attic.pending = 1;
|
||
*d++ = *s++;
|
||
}
|
||
ctx->inbound.attic.linelen = nread-n;
|
||
n--;
|
||
}
|
||
if (n && line[n-1] == '\r')
|
||
n--;
|
||
line[n] = 0;
|
||
ctx->inbound.linelen = n;
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
*line = 0;
|
||
ctx->inbound.linelen = 0;
|
||
return ctx->inbound.eof? ASSUAN_Line_Not_Terminated : ASSUAN_Line_Too_Long;
|
||
}
|
||
|
||
|
||
/* Read the next line from the client or server and return a pointer
|
||
to a buffer with holding that line. linelen returns the length of
|
||
the line. This buffer is valid until another read operation is
|
||
done on this buffer. The caller is allowed to modify this buffer.
|
||
He should only use the buffer if the function returns without an
|
||
error.
|
||
|
||
Returns: 0 on success or an assuan error code
|
||
See also: assuan_pending_line().
|
||
*/
|
||
AssuanError
|
||
assuan_read_line (ASSUAN_CONTEXT ctx, char **line, size_t *linelen)
|
||
{
|
||
AssuanError err;
|
||
|
||
if (!ctx)
|
||
return ASSUAN_Invalid_Value;
|
||
|
||
err = _assuan_read_line (ctx);
|
||
*line = ctx->inbound.line;
|
||
*linelen = ctx->inbound.linelen;
|
||
return err;
|
||
}
|
||
|
||
|
||
/* Return true when a full line is pending for a read, without the need
|
||
for actual IO */
|
||
int
|
||
assuan_pending_line (ASSUAN_CONTEXT ctx)
|
||
{
|
||
return ctx && ctx->inbound.attic.pending;
|
||
}
|
||
|
||
|
||
AssuanError
|
||
assuan_write_line (ASSUAN_CONTEXT ctx, const char *line )
|
||
{
|
||
int rc;
|
||
|
||
if (!ctx)
|
||
return ASSUAN_Invalid_Value;
|
||
|
||
/* fixme: we should do some kind of line buffering */
|
||
rc = writen (ctx->outbound.fd, line, strlen(line));
|
||
if (rc)
|
||
rc = ASSUAN_Write_Error;
|
||
if (!rc)
|
||
{
|
||
rc = writen (ctx->outbound.fd, "\n", 1);
|
||
if (rc)
|
||
rc = ASSUAN_Write_Error;
|
||
}
|
||
|
||
return rc;
|
||
}
|
||
|
||
|
||
|
||
/* Write out the data in buffer as datalines with line wrapping and
|
||
percent escaping. This fucntion is used for GNU's custom streams */
|
||
int
|
||
_assuan_cookie_write_data (void *cookie, const char *buffer, size_t size)
|
||
{
|
||
ASSUAN_CONTEXT ctx = cookie;
|
||
char *line;
|
||
size_t linelen;
|
||
|
||
if (ctx->outbound.data.error)
|
||
return 0;
|
||
|
||
line = ctx->outbound.data.line;
|
||
linelen = ctx->outbound.data.linelen;
|
||
line += linelen;
|
||
while (size)
|
||
{
|
||
/* insert data line header */
|
||
if (!linelen)
|
||
{
|
||
*line++ = 'D';
|
||
*line++ = ' ';
|
||
linelen += 2;
|
||
}
|
||
|
||
/* copy data, keep some space for the CRLF and to escape one character */
|
||
while (size && linelen < LINELENGTH-2-2)
|
||
{
|
||
if (*buffer == '%' || *buffer == '\r' || *buffer == '\n')
|
||
{
|
||
sprintf (line, "%%%02X", *(unsigned char*)buffer);
|
||
line += 3;
|
||
linelen += 3;
|
||
buffer++;
|
||
}
|
||
else
|
||
{
|
||
*line++ = *buffer++;
|
||
linelen++;
|
||
}
|
||
size--;
|
||
}
|
||
|
||
if (linelen >= LINELENGTH-2-2)
|
||
{
|
||
*line++ = '\n';
|
||
linelen++;
|
||
if (writen (ctx->outbound.fd, ctx->outbound.data.line, linelen))
|
||
{
|
||
ctx->outbound.data.error = ASSUAN_Write_Error;
|
||
return 0;
|
||
}
|
||
line = ctx->outbound.data.line;
|
||
linelen = 0;
|
||
}
|
||
}
|
||
|
||
ctx->outbound.data.linelen = linelen;
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Write out any buffered data
|
||
This fucntion is used for GNU's custom streams */
|
||
int
|
||
_assuan_cookie_write_flush (void *cookie)
|
||
{
|
||
ASSUAN_CONTEXT ctx = cookie;
|
||
char *line;
|
||
size_t linelen;
|
||
|
||
if (ctx->outbound.data.error)
|
||
return 0;
|
||
|
||
line = ctx->outbound.data.line;
|
||
linelen = ctx->outbound.data.linelen;
|
||
line += linelen;
|
||
if (linelen)
|
||
{
|
||
*line++ = '\n';
|
||
linelen++;
|
||
if (writen (ctx->outbound.fd, ctx->outbound.data.line, linelen))
|
||
{
|
||
ctx->outbound.data.error = ASSUAN_Write_Error;
|
||
return 0;
|
||
}
|
||
ctx->outbound.data.linelen = 0;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
|
||
/**
|
||
* assuan_send_data:
|
||
* @ctx: An assuan context
|
||
* @buffer: Data to send or NULL to flush
|
||
* @length: length of the data to send/
|
||
*
|
||
* This function may be used by the server or the client to send data
|
||
* lines. The data will be escaped as required by the Assuan protocol
|
||
* and may get buffered until a line is full. To force sending the
|
||
* data out @buffer may be passed as NULL (in which case @length must
|
||
* also be 0); however when used by a client this flush operation does
|
||
* also send the terminating "END" command to terminate the reponse on
|
||
* a INQUIRE response. However, when assuan_transact() is used, this
|
||
* function takes care of sending END itself.
|
||
*
|
||
* Return value: 0 on success or an error code
|
||
**/
|
||
|
||
AssuanError
|
||
assuan_send_data (ASSUAN_CONTEXT ctx, const void *buffer, size_t length)
|
||
{
|
||
if (!ctx)
|
||
return ASSUAN_Invalid_Value;
|
||
if (!buffer && length)
|
||
return ASSUAN_Invalid_Value;
|
||
|
||
if (!buffer)
|
||
{ /* flush what we have */
|
||
_assuan_cookie_write_flush (ctx);
|
||
if (ctx->outbound.data.error)
|
||
return ctx->outbound.data.error;
|
||
if (!ctx->is_server)
|
||
return assuan_write_line (ctx, "END");
|
||
}
|
||
else
|
||
{
|
||
_assuan_cookie_write_data (ctx, buffer, length);
|
||
if (ctx->outbound.data.error)
|
||
return ctx->outbound.data.error;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
|