radare2/libr/core/cmd_cmp.c

/* radare - LGPL - Copyright 2009-2012 - pancake */

R_API void r_core_cmpwatch_free (RCoreCmpWatcher *w) {
	free (w->ndata);
	free (w->odata);
	free (w);
}

R_API RCoreCmpWatcher* r_core_cmpwatch_get(RCore *core, ut64 addr) {
	RListIter *iter;
	RCoreCmpWatcher *w;
	r_list_foreach (core->watchers, iter, w) {
		if (addr == w->addr)
			return w;
	}
	return NULL;
}

R_API int r_core_cmpwatch_add (RCore *core, ut64 addr, int size, const char *cmd) {
	RCoreCmpWatcher *cmpw;
	if (size<1) return R_FALSE;
	cmpw = r_core_cmpwatch_get (core, addr);
	if (!cmpw) {
		cmpw = R_NEW (RCoreCmpWatcher);
		cmpw->addr = addr;
	}
	cmpw->size = size;
	strncpy (cmpw->cmd, cmd, sizeof (cmpw->cmd));
	cmpw->odata = NULL;
	cmpw->ndata = malloc (size);
	r_io_read_at (core->io, addr, cmpw->ndata, size);
	r_list_append (core->watchers, cmpw);
	return R_TRUE;
}

R_API int r_core_cmpwatch_del (RCore *core, ut64 addr) {
	int ret = R_FALSE;
	RCoreCmpWatcher *w;
	RListIter *iter, *iter2;
	r_list_foreach_safe (core->watchers, iter, iter2, w) {
		if (w->addr == addr || addr == UT64_MAX) {
			r_list_delete (core->watchers, iter);
			ret = R_TRUE;
		}
	}
	return ret;
}

R_API int r_core_cmpwatch_show (RCore *core, ut64 addr, int mode) {
	char cmd[128];
	RListIter *iter;
	RCoreCmpWatcher *w;
	r_list_foreach (core->watchers, iter, w) {
		int is_diff = w->odata? memcmp (w->odata, w->ndata, w->size): 0;
		switch (mode) {
		case '*':
			r_cons_printf ("cw 0x%08"PFMT64x" %d %s%s\n",
				w->addr, w->size, w->cmd, is_diff? " # differs":"");
			break;
		case 'd': // diff
			if (is_diff)
				r_cons_printf ("0x%08"PFMT64x" has changed\n", w->addr);
		case 'o': // old contents
			// use tmpblocksize
		default:
			r_cons_printf ("0x%08"PFMT64x"%s\n", w->addr, is_diff? " modified":"");
			snprintf (cmd, sizeof (cmd), "%s@%"PFMT64d"!%d",
				w->cmd, w->addr, w->size);
			r_core_cmd0 (core, cmd);
			break;
		}
	}
	return R_FALSE;
}

R_API int r_core_cmpwatch_update (RCore *core, ut64 addr) {
	RCoreCmpWatcher *w;
	RListIter *iter;
	r_list_foreach (core->watchers, iter, w) {
		free (w->odata);
		w->odata = w->ndata;
		w->ndata = malloc (w->size);
		r_io_read_at (core->io, w->addr, w->ndata, w->size);
	}
	return !r_list_empty (core->watchers);
}

R_API int r_core_cmpwatch_revert (RCore *core, ut64 addr) {
	RCoreCmpWatcher *w;
	int ret = R_FALSE;
	RListIter *iter;
	r_list_foreach (core->watchers, iter, w) {
		if (w->addr == addr || addr == UT64_MAX) {
			if (w->odata) {
				free (w->ndata);
				w->ndata = w->odata;
				w->odata = NULL;
				ret = R_TRUE;
			}
		}
	}
	return ret;
}
/** **/

static int radare_compare(RCore *core, const ut8 *f, const ut8 *d, int len) {
	int i, eq = 0;
	for (i=0; i<len; i++) {
		if (f[i]==d[i]) {
			eq++;
			continue;
		}
		r_cons_printf ("0x%08"PFMT64x" (byte=%.2d)   %02x '%c'  ->  %02x '%c'\n",
			core->offset+i, i+1,
			f[i], (IS_PRINTABLE(f[i]))?f[i]:' ',
			d[i], (IS_PRINTABLE(d[i]))?d[i]:' ');
	}
	eprintf ("Compare %d/%d equal bytes\n", eq, len);
	return len-eq;
}

static void cmd_cmp_watcher (RCore *core, const char *input) {
	char *p, *q, *r = NULL;
	int size = 0;
	ut64 addr = 0;
	switch (*input) {
	case ' ':
		p = strdup (input+1);
		q = strchr (p, ' ');
		if (q) {
			*q++ = 0;
			addr = r_num_math (core->num, p);
			r = strchr (q, ' ');
			if (r) {
				*r++ = 0;
				size = atoi (q);
			}
			r_core_cmpwatch_add (core, addr, size, r);
			//eprintf ("ADD (%llx) %d (%s)\n", addr, size, r);
		} else eprintf ("Missing parameters\n");
		free (p);
		break;
	case 'r':
		addr = input[1]? r_num_math (core->num, input+1): UT64_MAX;
		r_core_cmpwatch_revert (core, addr);
		break;
	case 'u':
		addr = input[1]? r_num_math (core->num, input+1): UT64_MAX;
		r_core_cmpwatch_update (core, addr);
		break;
	case '*':
		r_core_cmpwatch_show (core, UT64_MAX, '*');
		break;
	case '\0':
		r_core_cmpwatch_show (core, UT64_MAX, 0);
		break;
	case '?':
		r_cons_printf (
			"Usage: cw[?] [...]\n"
			"  cw              list all compare watchers\n"
			"  cw*             list compare watchers in r2 cmds\n"
			"  cw addr         list all compare watchers\n"
			"  cw addr sz cmd  add a memory watcher\n"
			//"  cws [addr]      show watchers\n"
			"  cwu [addr]      update watchers\n"
			"  cwr [addr]      reset/revert watchers\n"
			);
		break;
	}
}

static int cmd_cmp(void *data, const char *input) {
	RCore *core = data;
	FILE *fd;
	ut8 *buf;
	int ret;
	ut32 v32;
	ut64 v64;

	switch (*input) {
	case 'w':
		cmd_cmp_watcher (core, input+1);
		break;
	case ' ':
		radare_compare (core, core->block, (ut8*)input+1, strlen (input+1)+1);
		break;
	case 'x':
		if (input[1]!=' ') {
			eprintf ("Usage: cx 001122'\n");
			return 0;
		}
		buf = (ut8*)malloc (strlen (input+2));
		ret = r_hex_str2bin (input+2, buf);
		if (ret<1) eprintf ("Cannot parse hexpair\n");
		else radare_compare (core, core->block, buf, ret);
		free (buf);
		break;
	case 'X':
		buf = malloc (core->blocksize);
		ret = r_io_read_at (core->io, r_num_math (core->num, input+1),
			buf, core->blocksize);
		radare_compare (core, core->block, buf, ret);
		free (buf);
		break;
	case 'f':
		if (input[1]!=' ') {
			eprintf ("Please. use 'cf [file]'\n");
			return 0;
		}
		fd = r_sandbox_fopen (input+2, "rb");
		if (fd == NULL) {
			eprintf ("Cannot open file '%s'\n", input+2);
			return 0;
		}
		buf = (ut8 *)malloc (core->blocksize);
		fread (buf, 1, core->blocksize, fd);
		fclose (fd);
		radare_compare (core, core->block, buf, core->blocksize);
		free (buf);
		break;
	case 'q':
		v64 = (ut64) r_num_math (core->num, input+1);
		radare_compare (core, core->block, (ut8*)&v64, sizeof (v64));
		break;
	case 'd':
		v32 = (ut32) r_num_math (core->num, input+1);
		radare_compare (core, core->block, (ut8*)&v32, sizeof (v32));
		break;
#if 0
	case 'c':
		radare_compare_code (
			r_num_math (core->num, input+1),
			core->block, core->blocksize);
		break;
	case 'D':
		{ // XXX ugly hack
		char cmd[1024];
		sprintf (cmd, "radiff -b %s %s", ".curblock", input+2);
		r_file_dump (".curblock", config.block, config.block_size);
		radare_system(cmd);
		unlink(".curblock");
		}
		break;
#endif
	case 'c':
		{
		int col = core->cons->columns>123;
		ut8 *b = malloc (core->blocksize);
		ut64 addr = r_num_math (core->num, input+2);
		if (!b) return 0;
		memset (b, 0xff, core->blocksize);
		r_core_read_at (core, addr, b, core->blocksize);
		r_print_hexdiff (core->print, core->offset, core->block,
			addr, b, core->blocksize, col);
		free (b);
		}
		break;
	case 'g':
		{ // XXX: this is broken
			int diffops = 0;
		RCore *core2;
		char *file2 = NULL;
		if (input[1]=='o') {
			file2 = (char*)r_str_chop_ro (input+2);
			r_anal_diff_setup (core->anal, R_TRUE, -1, -1);
		} else
		if (input[1]==' ') {
			file2 = (char*)r_str_chop_ro (input+2);
			r_anal_diff_setup (core->anal, R_FALSE, -1, -1);
		} else {
			eprintf ("Usage: cg[o] [file]\n");
			eprintf (" cg  - byte-per-byte code graph diff\n");
			eprintf (" cgo - opcode-bytes code graph diff\n");
			return R_FALSE;
		}

		if (!(core2 = r_core_new ())) {
			eprintf ("Cannot init diff core\n");
			return R_FALSE;
		}
		core2->io->va = core->io->va;
		core2->anal->split = core->anal->split;
		if (!r_core_file_open (core2, file2, 0, 0LL)) {
			eprintf ("Cannot open diff file '%s'\n", file2);
			r_core_free (core2);
			return R_FALSE;
		}
		// TODO: must replicate on core1 too
		r_config_set_i (core2->config, "io.va", R_TRUE);
		r_config_set_i (core2->config, "anal.split", R_TRUE);
                r_anal_diff_setup (core->anal, diffops, -1, -1);
                r_anal_diff_setup (core2->anal, diffops, -1, -1);

		r_core_bin_load (core2, file2);
		r_core_gdiff (core, core2);
		r_core_diff_show (core, core2);
		r_core_free (core2);
		}
		break;
	case '?':
		r_cons_strcat (
		"Usage: c[?cdfx] [argument]\n"
		" c  [string]    Compares a plain with escaped chars string\n"
		" cc [at] [(at)] Compares in two hexdump columns of block size\n"
		//" cc [offset]   Code bindiff current block against offset\n"
		" cd [value]     Compare a doubleword from a math expression\n"
		//" cD [file]     Like above, but using radiff -b\n");
		" cq [value]     Compare a quadword from a math expression\n"
		" cx [hexpair]   Compare hexpair string\n"
		" cX [addr]      Like 'cc' but using hexdiff output\n"
		" cf [file]      Compare contents of file at current seek\n"
		" cg[o] [file]   Graphdiff current file and [file]\n"
		" cw[us?] [...]  Compare memory watchers\n");
		break;
	default:
		eprintf ("Usage: c[?cDdxfw] [argument]\n");
	}
	return 0;
}