granicus.if.org Git - strace/blob - netlink_unix_diag.c

   1 /*
   2  * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
   3  * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
   4  * Copyright (c) 2017-2018 The strace developers.
   5  * All rights reserved.
   6  *
   7  * SPDX-License-Identifier: LGPL-2.1-or-later
   8  */
   9
  10 #include "defs.h"
  11 #include "netlink.h"
  12 #include "netlink_sock_diag.h"
  13 #include "nlattr.h"
  14 #include "print_fields.h"
  15
  16 #include <linux/sock_diag.h>
  17 #include <linux/unix_diag.h>
  18
  19 #include "xlat/unix_diag_attrs.h"
  20 #include "xlat/unix_diag_show.h"
  21
  22 DECL_NETLINK_DIAG_DECODER(decode_unix_diag_req)
  23 {
  24         struct unix_diag_req req = { .sdiag_family = family };
  25         const size_t offset = sizeof(req.sdiag_family);
  26
  27         PRINT_FIELD_XVAL("{", req, sdiag_family, addrfams, "AF_???");
  28         tprints(", ");
  29         if (len >= sizeof(req)) {
  30                 if (!umoven_or_printaddr(tcp, addr + offset,
  31                                          sizeof(req) - offset,
  32                                          (char *) &req + offset)) {
  33                         PRINT_FIELD_U("", req, sdiag_protocol);
  34                         PRINT_FIELD_FLAGS(", ", req, udiag_states,
  35                                           tcp_state_flags, "1<<TCP_???");
  36                         PRINT_FIELD_U(", ", req, udiag_ino);
  37                         PRINT_FIELD_FLAGS(", ", req, udiag_show,
  38                                           unix_diag_show, "UDIAG_SHOW_???");
  39                         PRINT_FIELD_COOKIE(", ", req, udiag_cookie);
  40                 }
  41         } else
  42                 tprints("...");
  43         tprints("}");
  44 }
  45
  46 static bool
  47 decode_unix_diag_vfs(struct tcb *const tcp,
  48                      const kernel_ulong_t addr,
  49                      const unsigned int len,
  50                      const void *const opaque_data)
  51 {
  52         struct unix_diag_vfs uv;
  53
  54         if (len < sizeof(uv))
  55                 return false;
  56         if (umove_or_printaddr(tcp, addr, &uv))
  57                 return true;
  58
  59         PRINT_FIELD_DEV("{", uv, udiag_vfs_dev);
  60         PRINT_FIELD_U(", ", uv, udiag_vfs_ino);
  61         tprints("}");
  62
  63         return true;
  64 }
  65
  66 static bool
  67 print_inode(struct tcb *const tcp,
  68             void *const elem_buf,
  69             const size_t elem_size,
  70             void *const opaque_data)
  71 {
  72         tprintf("%" PRIu32, *(uint32_t *) elem_buf);
  73
  74         return true;
  75 }
  76
  77 static bool
  78 decode_unix_diag_inode(struct tcb *const tcp,
  79                        const kernel_ulong_t addr,
  80                        const unsigned int len,
  81                        const void *const opaque_data)
  82 {
  83         uint32_t inode;
  84         const size_t nmemb = len / sizeof(inode);
  85
  86         if (!nmemb)
  87                 return false;
  88
  89         print_array(tcp, addr, nmemb, &inode, sizeof(inode),
  90                     tfetch_mem, print_inode, 0);
  91
  92         return true;
  93 }
  94
  95 static bool
  96 decode_unix_diag_rqlen(struct tcb *const tcp,
  97                        const kernel_ulong_t addr,
  98                        const unsigned int len,
  99                        const void *const opaque_data)
 100 {
 101         struct unix_diag_rqlen rql;
 102
 103         if (len < sizeof(rql))
 104                 return false;
 105         if (umove_or_printaddr(tcp, addr, &rql))
 106                 return true;
 107
 108         PRINT_FIELD_U("{", rql, udiag_rqueue);
 109         PRINT_FIELD_U(", ", rql, udiag_wqueue);
 110         tprints("}");
 111
 112         return true;
 113 }
 114
 115 static const nla_decoder_t unix_diag_msg_nla_decoders[] = {
 116         [UNIX_DIAG_NAME]        = decode_nla_str,
 117         [UNIX_DIAG_VFS]         = decode_unix_diag_vfs,
 118         [UNIX_DIAG_PEER]        = decode_nla_u32,
 119         [UNIX_DIAG_ICONS]       = decode_unix_diag_inode,
 120         [UNIX_DIAG_RQLEN]       = decode_unix_diag_rqlen,
 121         [UNIX_DIAG_MEMINFO]     = decode_nla_meminfo,
 122         [UNIX_DIAG_SHUTDOWN]    = decode_nla_u8,
 123         [UNIX_DIAG_UID]         = decode_nla_uid
 124 };
 125
 126 DECL_NETLINK_DIAG_DECODER(decode_unix_diag_msg)
 127 {
 128         struct unix_diag_msg msg = { .udiag_family = family };
 129         size_t offset = sizeof(msg.udiag_family);
 130         bool decode_nla = false;
 131
 132         PRINT_FIELD_XVAL("{", msg, udiag_family, addrfams, "AF_???");
 133         tprints(", ");
 134         if (len >= sizeof(msg)) {
 135                 if (!umoven_or_printaddr(tcp, addr + offset,
 136                                          sizeof(msg) - offset,
 137                                          (char *) &msg + offset)) {
 138                         PRINT_FIELD_XVAL("", msg, udiag_type,
 139                                          socktypes, "SOCK_???");
 140                         PRINT_FIELD_XVAL(", ", msg, udiag_state,
 141                                          tcp_states, "TCP_???");
 142                         PRINT_FIELD_U(", ", msg, udiag_ino);
 143                         PRINT_FIELD_COOKIE(", ", msg, udiag_cookie);
 144                         decode_nla = true;
 145                 }
 146         } else
 147                 tprints("...");
 148         tprints("}");
 149
 150         offset = NLMSG_ALIGN(sizeof(msg));
 151         if (decode_nla && len > offset) {
 152                 tprints(", ");
 153                 decode_nlattr(tcp, addr + offset, len - offset,
 154                               unix_diag_attrs, "UNIX_DIAG_???",
 155                               unix_diag_msg_nla_decoders,
 156                               ARRAY_SIZE(unix_diag_msg_nla_decoders), NULL);
 157         }
 158 }