radare2/libr/anal/reflines.c

427 lines
11 KiB
C

/* radare - LGPL - Copyright 2009-2015 - pancake, nibble */
#include <r_core.h>
#include <r_util.h>
#include <r_cons.h>
#define mid_down_refline(a, r) ((r)->from > (r)->to && (a) < (r)->from && (a) > (r)->to)
#define mid_up_refline(a, r) ((r)->from < (r)->to && (a) > (r)->from && (a) < (r)->to)
#define mid_refline(a, r) (mid_down_refline (a, r) || mid_up_refline (a, r))
#define in_refline(a, r) (mid_refline (a, r) || (a) == (r)->from || (a) == (r)->to)
typedef struct refline_end {
int val;
bool is_from;
RAnalRefline *r;
} ReflineEnd;
static int cmp_asc(const struct refline_end *a, const struct refline_end *b) {
return a->val > b->val;
}
static int cmp_by_ref_lvl(const RAnalRefline *a, const RAnalRefline *b) {
return a->level < b->level;
}
static ReflineEnd *refline_end_new(ut64 val, bool is_from, RAnalRefline *ref) {
ReflineEnd *re = R_NEW0 (struct refline_end);
if (!re) return NULL;
re->val = val;
re->is_from = is_from;
re->r = ref;
return re;
}
static int add_refline(RList *list, RList *sten, ut64 addr, ut64 to, int *idx) {
ReflineEnd *re1, *re2;
RAnalRefline *item = R_NEW0 (RAnalRefline);
if (!item) return -1;
item->from = addr;
item->to = to;
item->index = *idx;
item->level = -1;
*idx += 1;
r_list_append (list, item);
re1 = refline_end_new (item->from, true, item);
if (!re1) goto re1_err;
r_list_add_sorted (sten, re1, (RListComparator)cmp_asc);
re2 = refline_end_new (item->to, false, item);
if (!re2) goto re2_err;
r_list_add_sorted (sten, re2, (RListComparator)cmp_asc);
return 0;
re2_err:
free (re1);
re1_err:
free (item);
return -1;
}
R_API void r_anal_reflines_free (RAnalRefline *rl) {
if (rl) {
free (rl);
}
}
/* returns a list of RAnalRefline for the code present in the buffer buf, of
* length len. A RAnalRefline exists from address A to address B if a jmp,
* conditional jmp or call instruction exists at address A and it targets
* address B.
*
* nlines - max number of lines of code to consider
* linesout - true if you want to display lines that go outside of the scope [addr;addr+len)
* linescall - true if you want to display call lines */
R_API RList *r_anal_reflines_get(RAnal *anal, ut64 addr, const ut8 *buf, ut64 len, int nlines, int linesout, int linescall) {
RList *list, *sten;
RListIter *iter;
RAnalOp op;
struct refline_end *el;
const ut8 *ptr = buf;
const ut8 *end = buf + len;
ut8 *free_levels;
int res, sz = 0, count = 0;
ut64 opc = addr;
memset (&op, 0, sizeof(op));
/*
* 1) find all reflines
* 2) sort "from"s and "to"s in a list
* 3) traverse the list to find the minimum available level for each refline
* * create a sorted list with available levels.
* * when we encounter a previously unseen "from" or "to" of a
* refline, we occupy the lowest level available for it.
* * when we encounter the "from" or "to" of an already seen
* refline, we free that level.
*/
list = r_list_new ();
if (!list) return NULL;
sten = r_list_new ();
if (!sten) goto list_err;
sten->free = (RListFree)free;
/* analyze code block */
while (ptr < end) {
if (nlines != -1) {
nlines--;
if (nlines == 0) break;
}
if (anal->maxreflines && count > anal->maxreflines) {
break;
}
addr += sz;
// This can segfault if opcode length and buffer check fails
r_anal_op_fini (&op);
sz = r_anal_op (anal, &op, addr, ptr, (int)(end - ptr));
if (sz <= 0) {
sz = 1;
goto __next;
}
/* store data */
switch (op.type) {
case R_ANAL_OP_TYPE_CALL:
if (!linescall) break;
case R_ANAL_OP_TYPE_CJMP:
case R_ANAL_OP_TYPE_JMP:
if ((!linesout && (op.jump > opc + len || op.jump < opc)) ||
op.jump == 0LL) {
break;
}
res = add_refline (list, sten, addr, op.jump, &count);
if (res < 0) goto sten_err;
break;
case R_ANAL_OP_TYPE_SWITCH:
{
RAnalCaseOp *caseop;
RListIter *iter;
// add caseops
if (!op.switch_op) break;
r_list_foreach (op.switch_op->cases, iter, caseop) {
if (!linesout && (op.jump > opc + len || op.jump < opc)) {
continue;
}
res = add_refline (list, sten, op.switch_op->addr,
caseop->jump, &count);
if (res < 0) goto sten_err;
}
break;
}
}
__next:
ptr += sz;
}
r_anal_op_fini (&op);
free_levels = R_NEWS0 (ut8, r_list_length (list) + 1);
if (!free_levels) goto sten_err;
int min = 0;
r_list_foreach (sten, iter, el) {
if ((el->is_from && el->r->level == -1) || (!el->is_from && el->r->level == -1)) {
el->r->level = min + 1;
free_levels[min] = 1;
if (min < 0) min = 0;
while (free_levels[++min] == 1);
} else {
free_levels[el->r->level - 1] = 0;
if (min > el->r->level - 1) min = el->r->level - 1;
}
}
/* XXX: the algorithm can be improved. We can calculate the set of
* reflines used in each interval of addresses and store them.
* Considering r_anal_reflines_str is always called with increasing
* addresses, we can just traverse linearly the list of intervals to
* know which reflines need to be drawn for each address. In this way,
* we don't need to traverse again and again the reflines for each call
* to r_anal_reflines_str, but we can reuse the data already
* calculated. Those data will be quickly available because the
* intervals will be sorted and the addresses to consider are always
* increasing. */
free (free_levels);
r_list_free (sten);
return list;
sten_err:
r_list_free (sten);
list_err:
r_list_free (list);
return NULL;
}
R_API RList*r_anal_reflines_fcn_get(RAnal *anal, RAnalFunction *fcn, int nlines, int linesout, int linescall) {
RList *list;
RAnalRefline *item;
RAnalBlock *bb;
RListIter *bb_iter;
int index = 0;
ut32 len;
list = r_list_new ();
if (!list) return NULL;
/* analyze code block */
r_list_foreach (fcn->bbs, bb_iter, bb) {
if (!bb || bb->size == 0) continue;
if (nlines != -1 && --nlines == 0) break;
len = bb->size;
/* store data */
ut64 control_type = bb->type;
control_type &= R_ANAL_BB_TYPE_SWITCH | R_ANAL_BB_TYPE_JMP | R_ANAL_BB_TYPE_COND | R_ANAL_BB_TYPE_CALL;
// handle call
if ( (control_type & R_ANAL_BB_TYPE_CALL) == R_ANAL_BB_TYPE_CALL && !linescall) {
continue;
}
// Handles conditonal + unconditional jump
if ( (control_type & R_ANAL_BB_TYPE_CJMP) == R_ANAL_BB_TYPE_CJMP) {
// dont need to continue here is opc+len exceed function scope
if (linesout && bb->fail > 0LL && bb->fail != bb->addr + len) {
item = R_NEW0 (RAnalRefline);
if (!item) {
r_list_free (list);
return NULL;
}
item->from = bb->addr;
item->to = bb->fail;
item->index = index++;
r_list_append (list, item);
}
}
if ( (control_type & R_ANAL_BB_TYPE_JMP) == R_ANAL_BB_TYPE_JMP) {
if (!linesout || bb->jump == 0LL || bb->jump == bb->addr + len)
continue;
item = R_NEW0 (RAnalRefline);
if (!item) {
r_list_free (list);
return NULL;
}
item->from = bb->addr;
item->to = bb->jump;
item->index = index++;
r_list_append (list, item);
continue;
}
// XXX - Todo test handle swith op
if (control_type & R_ANAL_BB_TYPE_SWITCH) {
if (bb->switch_op) {
RAnalCaseOp *caseop;
RListIter *iter;
r_list_foreach (bb->switch_op->cases, iter, caseop) {
if (caseop) {
if (!linesout)// && (op.jump > opc+len || op.jump < pc))
continue;
item = R_NEW0 (RAnalRefline);
if (!item){
r_list_free (list);
return NULL;
}
item->from = bb->switch_op->addr;
item->to = caseop->jump;
item->index = index++;
r_list_append (list, item);
}
}
}
}
}
return list;
}
R_API int r_anal_reflines_middle(RAnal *a, RList* /*<RAnalRefline>*/ list, ut64 addr, int len) {
if (a && list) {
RAnalRefline *ref;
RListIter *iter;
r_list_foreach (list, iter, ref) {
if ((ref->to > addr) && (ref->to < addr+len))
return R_TRUE;
}
}
return R_FALSE;
}
static const char* get_corner_char(RAnalRefline *ref, ut64 addr, int is_middle) {
if (addr == ref->to) {
if (is_middle) {
return (ref->from > ref->to) ? " " : "|";
}
return (ref->from > ref->to) ? "." : "`";
} else if (addr == ref->from) {
if (is_middle) {
return (ref->from > ref->to) ? "|" : " ";
}
return (ref->from > ref->to) ? "`" : ",";
}
return "";
}
static void add_spaces(RBuffer *b, int level, int pos, int wide) {
if (pos != -1) {
if (wide) {
pos *= 2;
level *= 2;
}
if (pos > level + 1) {
const char *pd = r_str_pad (' ', pos - level - 1);
r_buf_append_string (b, pd);
}
}
}
static void fill_level(RBuffer *b, int pos, char ch, RAnalRefline *r, int wide) {
const char *pd;
int sz = r->level;
if (wide) sz *= 2;
pd = r_str_pad (ch, sz - 1);
if (pos == -1) {
r_buf_append_string (b, pd);
} else {
r_buf_write_at (b, pos, (ut8 *)pd, strlen (pd));
}
}
// TODO: move into another file
// TODO: this is TOO SLOW. do not iterate over all reflines or gtfo
R_API char* r_anal_reflines_str(void *_core, ut64 addr, int opts) {
RCore *core = _core;
RAnal *anal = core->anal;
RBuffer *b;
RListIter *iter;
RAnalRefline *ref;
int l;
int dir = 0, wide = opts & R_ANAL_REFLINE_TYPE_WIDE;
int middle = opts & R_ANAL_REFLINE_TYPE_MIDDLE;
char *str = NULL;
if (!anal || !anal->reflines) return NULL;
RList *lvls = r_list_new ();
if (!lvls) return NULL;
r_list_foreach (anal->reflines, iter, ref) {
if (in_refline (addr, ref)) {
r_list_add_sorted (lvls, (void *)ref, (RListComparator)cmp_by_ref_lvl);
}
}
int pos = -1, max_level = -1;
b = r_buf_new ();
r_buf_append_string (b, " ");
r_list_foreach (lvls, iter, ref) {
if (ref->from == addr || ref->to == addr) {
const char *corner = get_corner_char (ref, addr, middle);
const char ch = ref->from == addr ? '=' : '-';
if (pos == 0) {
int ch_pos = max_level + 1 - ref->level;
if (wide) ch_pos = ch_pos * 2 - 1;
r_buf_write_at (b, ch_pos, (ut8 *)corner, 1);
fill_level (b, ch_pos + 1, ch, ref, wide);
} else {
add_spaces (b, ref->level, pos, wide);
r_buf_append_string (b, corner);
if (!middle) {
fill_level (b, -1, ch, ref, wide);
}
}
if (!middle) {
dir = ref->to == addr ? 1 : 2;
}
pos = middle ? ref->level : 0;
} else {
if (pos == 0) continue;
add_spaces (b, ref->level, pos, wide);
r_buf_append_string (b, "|");
pos = ref->level;
}
if (max_level == -1) max_level = ref->level;
}
add_spaces (b, 0, pos, wide);
str = r_buf_free_to_string (b);
if (core->anal->lineswidth > 0) {
int lw = core->anal->lineswidth;
l = strlen (str);
if (l > lw) {
r_str_cpy (str, str + l - lw);
} else {
char pfx[128];
lw -= l;
memset (pfx, ' ', sizeof (pfx));
if (lw >= sizeof (pfx)) {
lw = sizeof (pfx)-1;
}
if (lw > 0) {
pfx[lw] = 0;
str = r_str_prefix (str, pfx);
}
}
}
str = r_str_concat (str, (dir == 1) ? "-> "
: (dir == 2) ? "=< " : " ");
if (core->utf8 || opts & R_ANAL_REFLINE_TYPE_UTF8) {
RCons *c = core->cons;
str = r_str_replace (str, "<", c->vline[ARROW_LEFT], 1);
str = r_str_replace (str, ">", c->vline[ARROW_RIGHT], 1);
str = r_str_replace (str, "!", c->vline[LINE_UP], 1);
str = r_str_replace (str, "|", c->vline[LINE_VERT], 1);
str = r_str_replace (str, "=", c->vline[LINE_HORIZ], 1);
str = r_str_replace (str, "-", c->vline[LINE_HORIZ], 1);
str = r_str_replace (str, ",", c->vline[LUP_CORNER], 1);
str = r_str_replace (str, ".", c->vline[LUP_CORNER], 1);
str = r_str_replace (str, "`", c->vline[LDWN_CORNER], 1);
}
return str;
}