1  /*
       2   * Copyright (c) 2018 Harsha Sharma <harshasharmaiitr@gmail.com>
       3   * Copyright (c) 2018-2021 The strace developers.
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: LGPL-2.1-or-later
       7   */
       8  
       9  #include "defs.h"
      10  #include "netlink_kobject_uevent.h"
      11  
      12  #include <arpa/inet.h>
      13  
      14  #define PRINT_FIELD_HTONL_X(where_, field_)				\
      15  	do {								\
      16  		tprints_field_name(#field_);				\
      17  		tprints_arg_begin("htonl");				\
      18  		PRINT_VAL_X(ntohl((where_).field_));			\
      19  		tprint_arg_end();					\
      20  	} while (0)
      21  
      22  void
      23  decode_netlink_kobject_uevent(struct tcb *tcp, kernel_ulong_t addr,
      24  			      kernel_ulong_t len)
      25  {
      26  	struct udev_monitor_netlink_header uh;
      27  	const char *prefix = "libudev";
      28  	unsigned int offset = sizeof(uh);
      29  
      30  	if (!verbose(tcp) || (exiting(tcp) && syserror(tcp)) ||
      31  	    !addr || len < offset || umove(tcp, addr, &uh) ||
      32  	    strcmp(uh.prefix, prefix) != 0) {
      33  		printstrn(tcp, addr, len);
      34  		return;
      35  	}
      36  
      37  	if (len > offset)
      38  		tprint_array_begin();
      39  	tprint_struct_begin();
      40  	PRINT_FIELD_CSTRING(uh, prefix);
      41  	tprint_struct_next();
      42  
      43  	PRINT_FIELD_HTONL_X(uh, magic);
      44  	tprint_struct_next();
      45  
      46  	PRINT_FIELD_U(uh, header_size);
      47  	tprint_struct_next();
      48  
      49  	PRINT_FIELD_U(uh, properties_off);
      50  	tprint_struct_next();
      51  
      52  	PRINT_FIELD_U(uh, properties_len);
      53  	tprint_struct_next();
      54  
      55  	PRINT_FIELD_HTONL_X(uh, filter_subsystem_hash);
      56  	tprint_struct_next();
      57  
      58  	PRINT_FIELD_HTONL_X(uh, filter_devtype_hash);
      59  	tprint_struct_next();
      60  
      61  	PRINT_FIELD_HTONL_X(uh, filter_tag_bloom_hi);
      62  	tprint_struct_next();
      63  
      64  	PRINT_FIELD_HTONL_X(uh, filter_tag_bloom_lo);
      65  	tprint_struct_end();
      66  
      67  	if (len > offset) {
      68  		tprint_array_next();
      69  		printstrn(tcp, addr + offset, len - offset);
      70  		tprint_array_end();
      71  	}
      72  }