struct instr_vertex *instr_vertex_copy(struct instr_vertex *from)
{
struct instr_vertex *iv = (struct instr_vertex *)malloc(sizeof(struct instr_vertex));
memset(iv, 0, sizeof(struct instr_vertex));
iv->eip = from->eip;
iv->instr_string = emu_string_new();
iv->dll = from->dll;
iv->syscall = from->syscall;
emu_string_append_char(iv->instr_string, from->instr_string->data);
return iv;
}
void emu_string_append_format(struct emu_string *s, const char *format, ...)
{
va_list ap;
char *message;
va_start(ap, format);
int va = vasprintf(&message, format, ap);
va_end(ap);
if (va == -1)
exit(-1);
emu_string_append_char(s, message);
free(message);
}
int graph_draw(struct emu_graph *graph)
{
struct emu_vertex *ev;
struct instr_vertex *iv;
FILE *f = fopen(opts.graphfile,"w+");
struct emu_graph *sgraph = emu_graph_new();
struct emu_hashtable *ht = emu_hashtable_new(2047, emu_hashtable_ptr_hash, emu_hashtable_ptr_cmp);
struct emu_vertex *nev;
struct instr_vertex *niv=NULL;
printf("copying vertexes\n");
for ( ev = emu_vertexes_first(graph->vertexes); !emu_vertexes_attail(ev); ev = emu_vertexes_next(ev) )
{
iv = (struct instr_vertex *)ev->data;
nev = emu_vertex_new();
emu_graph_vertex_add(sgraph, nev);
niv = instr_vertex_copy(iv);
nev->data = niv;
emu_hashtable_insert(ht, (void *)iv, nev);
ev->color = white;
}
printf("optimizing graph\n");
for ( ev = emu_vertexes_first(graph->vertexes); !emu_vertexes_attail(ev); ev = emu_vertexes_next(ev) )
{
// ignore known
if ( ev->color == black )
continue;
printf("vertex %p\n", (void *)ev);
// find the first in a chain
iv = (struct instr_vertex *)ev->data;
while ( emu_edges_length(ev->backedges) == 1 && emu_edges_length(ev->edges) <= 1 && ev->color == white && iv->dll == NULL && iv->syscall == NULL )
{
ev->color = grey;
struct emu_vertex *xev = emu_edges_first(ev->backedges)->destination;
iv = (struct instr_vertex *)xev->data;
if ( emu_edges_length(xev->backedges) > 1 || emu_edges_length(xev->edges) > 1 || iv->dll != NULL || iv->syscall != NULL )
break;
ev = xev;
printf(" -> vertex %p\n",(void *)ev);
}
iv = (struct instr_vertex *)ev->data;
// create the new vertex
nev = (struct emu_vertex *)emu_hashtable_search(ht, (void *)iv)->value;
niv = (struct instr_vertex *)nev->data;
iv = (struct instr_vertex *)ev->data;
printf("going forwards from %p\n", (void *)ev);
while ( emu_edges_length(ev->edges) == 1 && emu_edges_length(ev->backedges) <= 1 && ev->color != black && iv->dll == NULL && iv->syscall == NULL )
{
ev->color = black;
struct emu_vertex *xev = emu_edges_first(ev->edges)->destination;
iv = (struct instr_vertex *)xev->data;
if ( emu_edges_length(xev->backedges) > 1 || emu_edges_length(xev->edges) > 1 ||
iv->dll != NULL || iv->syscall != NULL )
break;
ev = xev;
iv = (struct instr_vertex *)ev->data;
emu_string_append_char(niv->instr_string, emu_string_char(iv->instr_string));
printf(" -> vertex %p\n",(void *)ev);
}
ev->color = black;
printf("copying edges for %p\n",(void *)ev);
struct emu_edge *ee;
for ( ee = emu_edges_first(ev->edges); !emu_edges_attail(ee); ee = emu_edges_next(ee) )
{
struct instr_vertex *ivto = emu_vertex_data_get(ee->destination);
struct emu_hashtable_item *ehi = emu_hashtable_search(ht, (void *)ivto);
struct emu_vertex *to = (struct emu_vertex *)ehi->value;
if ( 1 )// nev != to )//&& to->color != black )
{
struct emu_edge *nee = emu_vertex_edge_add(nev, to);
nee->count = ee->count;
nee->data = ee->data;
printf(" -> %p\n", (void *)to);
}
}
}
graph->vertex_destructor = instr_vertex_destructor;
// emu_graph_free(graph);
graph = sgraph;
emu_hashtable_free(ht);
fprintf(f, "digraph G {\n\t//rankdir=LR\n\tnode [fontname=Courier, labeljust=r];\n");
#if 0
int numdlls=0;
while ( env->loaded_dlls[numdlls] != NULL )
{
int has_dll = 0;
struct emu_string *fs = emu_string_new();
emu_string_append_format(fs, "\t subgraph cluster%i {\n\t\t node [shape=box, style=filled, color=\".7 .3 1.0\"];\n\t\tstyle=filled;\n\t\tcolor=lightgrey;\n\t\tlabel=\"%s\"\n\t\t", numdlls, env->loaded_dlls[numdlls]->dllname);
for ( ev = emu_vertexes_first(graph->vertexes); !emu_vertexes_attail(ev); ev = emu_vertexes_next(ev) )
{
struct instr_vertex *iv = emu_vertex_data_get(ev);
if ( iv->dll == env->loaded_dlls[numdlls] )
{
emu_string_append_format(fs, "\t\%i [label = \"%s\"];\n", iv->eip, emu_string_char(iv->instr_string));
has_dll = 1;
}
}
emu_string_append_char(fs, "\t}\n");
fprintf(f, "%s", emu_string_char(fs));
numdlls++;
}
