radare2/libr/debug/snap.c

/* radare - LGPL - Copyright 2015-2021 - pancake, rkx1209 */

#include <r_debug.h>
#include <r_hash.h>

R_API void r_debug_snap_free(RDebugSnap *snap) {
	if (snap) {
		free (snap->name);
		free (snap->data);
		R_FREE (snap);
	}
}

R_API RDebugSnap *r_debug_snap_map(RDebug *dbg, RDebugMap *map) {
	r_return_val_if_fail (dbg && map, NULL);
	if (map->size < 1) {
		R_LOG_ERROR ("Invalid map size");
		return NULL;
	}
	// TODO: Support streaming memory snapshots to avoid big allocations
	if (map->size > dbg->maxsnapsize) {
		char *us = r_num_units (NULL, 0, map->size);
		const char *name = r_str_get (map->name);
		R_LOG_ERROR ("Not snapping map %s (%s > dbg.maxsnapsize)", name, us);
		free (us);
		return NULL;
	}

	RDebugSnap *snap = R_NEW0 (RDebugSnap);
	if (!snap) {
		return NULL;
	}

	snap->name = strdup (map->name);
	snap->addr = map->addr;
	snap->addr_end = map->addr_end;
	snap->size = map->size;
	snap->perm = map->perm;
	snap->user = map->user;
	snap->shared = map->shared;

	snap->data = malloc (map->size);
	if (!snap->data) {
		r_debug_snap_free (snap);
		return NULL;
	}
	R_LOG_INFO ("Reading %d byte(s) from 0x%08"PFMT64x, snap->size, snap->addr);
	dbg->iob.read_at (dbg->iob.io, snap->addr, snap->data, snap->size);

	r_list_append (dbg->snaps, snap);
	return snap;
}

R_API bool r_debug_snap_contains(RDebugSnap *snap, ut64 addr) {
	return (snap->addr <= addr && addr >= snap->addr_end);
}

R_API ut8 *r_debug_snap_get_hash(RDebugSnap *snap) {
	ut64 algobit = r_hash_name_to_bits ("sha256");
	RHash *ctx = r_hash_new (true, algobit);
	if (!ctx) {
		return NULL;
	}

	r_hash_do_begin (ctx, algobit);
	r_hash_calculate (ctx, algobit, snap->data, snap->size);
	r_hash_do_end (ctx, algobit);

	ut8 *ret = malloc (R_HASH_SIZE_SHA256);
	if (!ret) {
		r_hash_free (ctx);
		return NULL;
	}
	memcpy (ret, ctx->digest, R_HASH_SIZE_SHA256);

	r_hash_free (ctx);
	return ret;
}

R_API bool r_debug_snap_is_equal(RDebugSnap *a, RDebugSnap *b) {
	bool ret = false;
	ut64 algobit = r_hash_name_to_bits ("sha256");
	RHash *ctx = r_hash_new (true, algobit);
	if (!ctx) {
		return ret;
	}

	r_hash_do_begin (ctx, algobit);
	r_hash_calculate (ctx, algobit, a->data, a->size);
	r_hash_do_end (ctx, algobit);

	ut8 *temp = malloc (R_HASH_SIZE_SHA256);
	if (!temp) {
		r_hash_free (ctx);
		return ret;
	}
	memcpy (temp, ctx->digest, R_HASH_SIZE_SHA256);

	r_hash_do_begin (ctx, algobit);
	r_hash_calculate (ctx, algobit, b->data, b->size);
	r_hash_do_end (ctx, algobit);

	ret = memcmp (temp, ctx->digest, R_HASH_SIZE_SHA256) == 0;
	free (temp);
	r_hash_free (ctx);
	return ret;
}

R_API int r_debug_snap_delete(RDebug *dbg, int idx) {
	ut32 count = 0;
	RListIter *iter;
	RDebugSnap *snap;
	if (idx == -1) {
		r_list_free (dbg->snaps);
		dbg->snaps = r_list_newf ((RListFree)r_debug_snap_free);
		return 1;
	}
	r_list_foreach (dbg->snaps, iter, snap) {
		if (idx != -1) {
			if (idx != count) {
				continue;
			}
		}
		R_LOG_DEBUG ("snap %p", snap);
		r_list_delete (dbg->snaps, iter);
		count++;
		break;
	}
	return 1;
}

R_API void r_debug_snap_list(RDebug *dbg, int idx, int mode) {
	const char *comment, *comma;
	ut32 count = 0;
	RListIter *iter;
	RDebugSnap *snap;
	if (mode == 'j')
		dbg->cb_printf ("[");
	r_list_foreach (dbg->snaps, iter, snap) {
		comment = "";
		comma = (iter->n)? ",":"";
		if (idx != -1) {
			if (idx != count) {
				continue;
			}
		}
		if (snap->comment && *snap->comment)
			comment = snap->comment;
		switch (mode) {
		case 'j':
			dbg->cb_printf ("{\"count\":%d,\"addr\":%"PFMT64d",\"size\":%d,\"crc\":%d,\"comment\":\"%s\"}%s",
				count, snap->addr, snap->size, snap->crc, comment, comma);
			break;
		case '*':
			dbg->cb_printf ("dms 0x%08"PFMT64x"\n", snap->addr);
			break;
		default:
			dbg->cb_printf ("%d 0x%08"PFMT64x" - 0x%08"PFMT64x" size: %d crc: %x  --  %s\n",
				count, snap->addr, snap->addr_end, snap->size, snap->crc, comment);
		}
		count++;
	}
	if (mode == 'j') {
		dbg->cb_printf ("]\n");
	}
}

R_API int r_debug_snap_all(RDebug *dbg, int perms) {
	RDebugMap *map;
	RListIter *iter;
	r_debug_map_sync (dbg);
	r_list_foreach (dbg->maps, iter, map) {
		if (!perms || (map->perm & perms)==perms) {
			r_debug_snap_map (dbg, map);
		}
	}
	return 0;
}

R_API int r_debug_snap(RDebug *dbg, ut64 addr) {
	RDebugMap *map = r_debug_map_get (dbg, addr);
	if (!map) {
		R_LOG_ERROR ("Cannot find map at 0x%08"PFMT64x, addr);
		return 0;
	}
	return r_debug_snap_map (dbg, map) != NULL;
}

R_API int r_debug_snap_comment(RDebug *dbg, int idx, const char *msg) {
	RDebugSnap *snap;
	RListIter *iter;
	ut32 count = 0;
	if (!dbg || idx<0 || !msg || !*msg)
		return 0;
	r_list_foreach (dbg->snaps, iter, snap) {
		if (count == idx) {
			free (snap->comment);
			snap->comment = r_str_trim_dup (msg);
			break;
		}
		count++;
	}
	return 1;
}