summaryrefslogtreecommitdiff
path: root/ld/ldbuildid.c
blob: d3c406c017823bda4cd4009238ff86268de82b46 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/* ldbuildid.c - Build Id support routines
   Copyright (C) 2013-2017 Free Software Foundation, Inc.

   This file is part of the GNU Binutils.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "safe-ctype.h"
#include "md5.h"
#include "sha1.h"
#include "ldbuildid.h"
#ifdef __MINGW32__
#include <windows.h>
#include <rpcdce.h>
#endif

#define streq(a,b)     strcmp ((a), (b)) == 0
#define strneq(a,b,n)  strncmp ((a), (b), (n)) == 0

bfd_boolean
validate_build_id_style (const char *style)
{
  if ((streq (style, "md5")) || (streq (style, "sha1"))
      || (streq (style, "uuid")) || (strneq (style, "0x", 2)))
    return TRUE;

  return FALSE;
}

bfd_size_type
compute_build_id_size (const char *style)
{
  if (streq (style, "md5") || streq (style, "uuid"))
    return 128 / 8;

  if (streq (style, "sha1"))
    return 160 / 8;

  if (strneq (style, "0x", 2))
    {
      bfd_size_type size = 0;
      /* ID is in string form (hex).  Count the bytes.  */
      const char *id = style + 2;

      do
	{
	  if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
	    {
	      ++size;
	      id += 2;
	    }
	  else if (*id == '-' || *id == ':')
	    ++id;
	  else
	    {
	      size = 0;
	      break;
	    }
	} while (*id != '\0');
      return size;
    }

  return 0;
}

static unsigned char
read_hex (const char xdigit)
{
  if (ISDIGIT (xdigit))
    return xdigit - '0';

  if (ISUPPER (xdigit))
    return xdigit - 'A' + 0xa;

  if (ISLOWER (xdigit))
    return xdigit - 'a' + 0xa;

  abort ();
  return 0;
}

bfd_boolean
generate_build_id (bfd *abfd,
		   const char *style,
		   checksum_fn checksum_contents,
		   unsigned char *id_bits,
		   int size ATTRIBUTE_UNUSED)
{
  if (streq (style, "md5"))
    {
      struct md5_ctx ctx;

      md5_init_ctx (&ctx);
      if (!(*checksum_contents) (abfd, (sum_fn) &md5_process_bytes, &ctx))
	return FALSE;
      md5_finish_ctx (&ctx, id_bits);
    }
  else if (streq (style, "sha1"))
    {
      struct sha1_ctx ctx;

      sha1_init_ctx (&ctx);
      if (!(*checksum_contents) (abfd, (sum_fn) &sha1_process_bytes, &ctx))
	return FALSE;
      sha1_finish_ctx (&ctx, id_bits);
    }
  else if (streq (style, "uuid"))
    {
#ifndef __MINGW32__
      int n;
      int fd = open ("/dev/urandom", O_RDONLY);

      if (fd < 0)
	return FALSE;
      n = read (fd, id_bits, size);
      close (fd);
      if (n < size)
	return FALSE;
#else /* __MINGW32__ */
      typedef RPC_STATUS (RPC_ENTRY * UuidCreateFn) (UUID *);
      UUID          uuid;
      UuidCreateFn  uuid_create = 0;
      HMODULE       rpc_library = LoadLibrary ("rpcrt4.dll");

      if (!rpc_library)
	return FALSE;
      uuid_create = (UuidCreateFn) GetProcAddress (rpc_library, "UuidCreate");
      if (!uuid_create)
	{
	  FreeLibrary (rpc_library);
	  return FALSE;
	}

      if (uuid_create (&uuid) != RPC_S_OK)
	{
	  FreeLibrary (rpc_library);
	  return FALSE;
	}
      FreeLibrary (rpc_library);
      memcpy (id_bits, &uuid,
	      (size_t) size < sizeof (UUID) ? (size_t) size : sizeof (UUID));
#endif /* __MINGW32__ */
    }
  else if (strneq (style, "0x", 2))
    {
      /* ID is in string form (hex).  Convert to bits.  */
      const char *id = style + 2;
      size_t n = 0;

      do
	{
	  if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
	    {
	      id_bits[n] = read_hex (*id++) << 4;
	      id_bits[n++] |= read_hex (*id++);
	    }
	  else if (*id == '-' || *id == ':')
	    ++id;
	  else
	    abort ();		/* Should have been validated earlier.  */
	}
      while (*id != '\0');
    }
  else
    abort ();			/* Should have been validated earlier.  */

  return TRUE;
}