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#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <unistd.h>
#include "parser.h"
char *tab_depth(int depth)
{
static pstring spaces;
memset(spaces, ' ', depth * 4);
spaces[depth * 4] = 0;
return spaces;
}
/****************************************************************************
expand a pointer to be a particular size
****************************************************************************/
void *Realloc(void *p,size_t size)
{
void *ret=NULL;
if (size == 0) {
if (p) free(p);
DEBUG(5,("Realloc asked for 0 bytes\n"));
return NULL;
}
if (!p)
ret = (void *)malloc(size);
else
ret = (void *)realloc(p,size);
if (!ret)
DEBUG(0,("Memory allocation error: failed to expand to %d bytes\n",(int)size));
return(ret);
}
/*******************************************************************
Attempt, if needed, to grow a data buffer.
Also depends on the data stream mode (io).
********************************************************************/
BOOL prs_grow(prs_struct *ps, uint32 extra_space)
{
uint32 new_size;
char *new_data;
ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);
if(ps->data_offset + extra_space <= ps->buffer_size)
return True;
/*
* We cannot grow the buffer if we're not reading
* into the prs_struct, or if we don't own the memory.
*/
if(UNMARSHALLING(ps) || !ps->is_dynamic) {
DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
(unsigned int)extra_space));
return False;
}
/*
* Decide how much extra space we really need.
*/
extra_space -= (ps->buffer_size - ps->data_offset);
if(ps->buffer_size == 0) {
/*
* Ensure we have at least a PDU's length, or extra_space, whichever
* is greater.
*/
new_size = MAX(MAX_PDU_FRAG_LEN,extra_space);
if((new_data = malloc(new_size)) == NULL) {
DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
return False;
}
memset(new_data, '\0', new_size );
} else {
/*
* If the current buffer size is bigger than the space needed, just
* double it, else add extra_space.
*/
new_size = MAX(ps->buffer_size*2, ps->buffer_size + extra_space);
if ((new_data = Realloc(ps->data_p, new_size)) == NULL) {
DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
(unsigned int)new_size));
return False;
}
}
ps->buffer_size = new_size;
ps->data_p = new_data;
return True;
}
/*******************************************************************
Ensure we can read/write to a given offset.
********************************************************************/
char *prs_mem_get(prs_struct *ps, uint32 extra_size)
{
if(UNMARSHALLING(ps)) {
/*
* If reading, ensure that we can read the requested size item.
*/
if (ps->data_offset + extra_size > ps->buffer_size) {
DEBUG(0,("prs_mem_get: reading data of size %u would overrun buffer.\n",
(unsigned int)extra_size ));
return NULL;
}
} else {
/*
* Writing - grow the buffer if needed.
*/
if(!prs_grow(ps, extra_size))
return False;
}
return &ps->data_p[ps->data_offset];
}
/*******************************************************************
Stream a uint32.
********************************************************************/
BOOL prs_uint32(char *name, prs_struct *ps, int depth, uint32 *data32, BOOL scalars)
{
char *q = prs_mem_get(ps, sizeof(uint32));
if (q == NULL)
return False;
DBG_RW_IVAL(name, depth, ps->data_offset, ps->io, ps->bigendian_data, q, *data32)
ps->data_offset += sizeof(uint32);
return True;
}
/*******************************************************************
Initialise a parse structure - malloc the data if requested.
********************************************************************/
BOOL prs_init(prs_struct *ps, uint32 size, uint8 align, BOOL io)
{
ZERO_STRUCTP(ps);
ps->io = io;
ps->bigendian_data = False;
ps->align = align;
ps->is_dynamic = False;
ps->data_offset = 0;
ps->buffer_size = 0;
ps->data_p = NULL;
if (size != 0) {
ps->buffer_size = size;
if((ps->data_p = (char *)malloc((size_t)size)) == NULL) {
DEBUG(0,("prs_init: malloc fail for %u bytes.\n", (unsigned int)size));
return False;
}
ps->is_dynamic = True; /* We own this memory. */
}
return True;
}
/*******************************************************************
debug output for parsing info.
XXXX side-effect of this function is to increase the debug depth XXXX
********************************************************************/
void prs_debug(prs_struct *ps, int depth, char *desc, char *fn_name)
{
DEBUG(5+depth, ("%s%06x %s %s\n", tab_depth(depth), ps->data_offset, fn_name, desc));
}
/*******************************************************************
Align a the data_len to a multiple of align bytes - filling with
zeros.
********************************************************************/
BOOL prs_align(prs_struct *ps)
{
uint32 mod = ps->data_offset & (ps->align-1);
if (ps->align != 0 && mod != 0) {
uint32 extra_space = (ps->align - mod);
if(!prs_grow(ps, extra_space))
return False;
memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
ps->data_offset += extra_space;
}
return True;
}
void print_asc(int level, unsigned char *buf,int len)
{
int i;
for (i=0;i<len;i++)
DEBUG(level,("%c", isprint(buf[i])?buf[i]:'.'));
}
/*******************************************************************
read from a socket into memory.
********************************************************************/
BOOL prs_read(prs_struct *ps, int fd, size_t len, int timeout)
{
BOOL ok;
size_t prev_size = ps->buffer_size;
if (!prs_grow(ps, len))
{
return False;
}
if (timeout > 0)
{
ok = (read(fd, &ps->data_p[prev_size], len) == len);
}
else
{
ok = (read(fd, &ps->data_p[prev_size], len) == len);
}
return ok;
}
void dump_data(int level,char *buf1,int len)
{
unsigned char *buf = (unsigned char *)buf1;
int i=0;
if (len<=0) return;
DEBUG(level,("[%03X] ",i));
for (i=0;i<len;) {
DEBUG(level,("%02X ",(int)buf[i]));
i++;
if (i%8 == 0) DEBUG(level,(" "));
if (i%16 == 0) {
print_asc(level,&buf[i-16],8); DEBUG(level,(" "));
print_asc(level,&buf[i-8],8); DEBUG(level,("\n"));
if (i<len) DEBUG(level,("[%03X] ",i));
}
}
if (i%16) {
int n;
n = 16 - (i%16);
DEBUG(level,(" "));
if (n>8) DEBUG(level,(" "));
while (n--) DEBUG(level,(" "));
n = MIN(8,i%16);
print_asc(level,&buf[i-(i%16)],n); DEBUG(level,(" "));
n = (i%16) - n;
if (n>0) print_asc(level,&buf[i-n],n);
DEBUG(level,("\n"));
}
}
/*******************************************************************
Stream a pointer
********************************************************************/
BOOL prs_pointer(char *desc, prs_struct *ps, int depth, void **p, BOOL scalars)
{
uint32 v = (*p) ? 1 : 0;
if (!prs_uint32(desc, ps, depth, &v, True)) return False;
*p = (void *) (v ? 1 : 0);
return True;
}
/******************************************************************
Stream an array of uint16s. Length is number of uint16s.
********************************************************************/
BOOL prs_uint16s(BOOL charmode, char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
{
char *q = prs_mem_get(ps, len * sizeof(uint16));
if (q == NULL)
return False;
DBG_RW_PSVAL(charmode, name, depth, ps->data_offset, ps->io, ps->bigendian_data, q, data16s, len)
ps->data_offset += (len * sizeof(uint16));
return True;
}
/******************************************************************
Stream an array of uint32s. Length is number of uint32s.
********************************************************************/
BOOL prs_uint32s(BOOL charmode, char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
{
char *q = prs_mem_get(ps, len * sizeof(uint32));
if (q == NULL)
return False;
DBG_RW_PIVAL(charmode, name, depth, ps->data_offset, ps->io, ps->bigendian_data, q, data32s, len)
ps->data_offset += (len * sizeof(uint32));
return True;
}
/*******************************************************************
Stream a uint16.
********************************************************************/
BOOL prs_uint16(char *name, prs_struct *ps, int depth, uint16 *data16, BOOL scalars)
{
char *q = prs_mem_get(ps, sizeof(uint16));
if (q == NULL)
return False;
DBG_RW_SVAL(name, depth, ps->data_offset, ps->io, ps->bigendian_data, q, *data16)
ps->data_offset += sizeof(uint16);
return True;
}
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