1 /* ldbuildid.c - Build Id support routines
2 Copyright (C) 2013-2016 Free Software Foundation, Inc.
3
4 This file is part of the GNU Binutils.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "safe-ctype.h"
24 #include "md5.h"
25 #include "sha1.h"
26 #include "ldbuildid.h"
27
28 #define streq(a,b) strcmp ((a), (b)) == 0
29 #define strneq(a,b,n) strncmp ((a), (b), (n)) == 0
30
31 bfd_boolean
validate_build_id_style(const char * style)32 validate_build_id_style (const char *style)
33 {
34 if ((streq (style, "md5")) || (streq (style, "sha1"))
35 #ifndef __MINGW32__
36 || (streq (style, "uuid"))
37 #endif
38 || (strneq (style, "0x", 2)))
39 return TRUE;
40
41 return FALSE;
42 }
43
44 bfd_size_type
compute_build_id_size(const char * style)45 compute_build_id_size (const char *style)
46 {
47 if (streq (style, "md5") || streq (style, "uuid"))
48 return 128 / 8;
49
50 if (streq (style, "sha1"))
51 return 160 / 8;
52
53 if (strneq (style, "0x", 2))
54 {
55 bfd_size_type size = 0;
56 /* ID is in string form (hex). Count the bytes. */
57 const char *id = style + 2;
58
59 do
60 {
61 if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
62 {
63 ++size;
64 id += 2;
65 }
66 else if (*id == '-' || *id == ':')
67 ++id;
68 else
69 {
70 size = 0;
71 break;
72 }
73 } while (*id != '\0');
74 return size;
75 }
76
77 return 0;
78 }
79
80 static unsigned char
read_hex(const char xdigit)81 read_hex (const char xdigit)
82 {
83 if (ISDIGIT (xdigit))
84 return xdigit - '0';
85
86 if (ISUPPER (xdigit))
87 return xdigit - 'A' + 0xa;
88
89 if (ISLOWER (xdigit))
90 return xdigit - 'a' + 0xa;
91
92 abort ();
93 return 0;
94 }
95
96 bfd_boolean
generate_build_id(bfd * abfd,const char * style,checksum_fn checksum_contents,unsigned char * id_bits,int size ATTRIBUTE_UNUSED)97 generate_build_id (bfd *abfd,
98 const char *style,
99 checksum_fn checksum_contents,
100 unsigned char *id_bits,
101 int size ATTRIBUTE_UNUSED)
102 {
103 if (streq (style, "md5"))
104 {
105 struct md5_ctx ctx;
106
107 md5_init_ctx (&ctx);
108 if (!(*checksum_contents) (abfd, (sum_fn) &md5_process_bytes, &ctx))
109 return FALSE;
110 md5_finish_ctx (&ctx, id_bits);
111 }
112 else if (streq (style, "sha1"))
113 {
114 struct sha1_ctx ctx;
115
116 sha1_init_ctx (&ctx);
117 if (!(*checksum_contents) (abfd, (sum_fn) &sha1_process_bytes, &ctx))
118 return FALSE;
119 sha1_finish_ctx (&ctx, id_bits);
120 }
121 #ifndef __MINGW32__
122 else if (streq (style, "uuid"))
123 {
124 int n;
125 int fd = open ("/dev/urandom", O_RDONLY);
126
127 if (fd < 0)
128 return FALSE;
129 n = read (fd, id_bits, size);
130 close (fd);
131 if (n < size)
132 return FALSE;
133 }
134 #endif
135 else if (strneq (style, "0x", 2))
136 {
137 /* ID is in string form (hex). Convert to bits. */
138 const char *id = style + 2;
139 size_t n = 0;
140
141 do
142 {
143 if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
144 {
145 id_bits[n] = read_hex (*id++) << 4;
146 id_bits[n++] |= read_hex (*id++);
147 }
148 else if (*id == '-' || *id == ':')
149 ++id;
150 else
151 abort (); /* Should have been validated earlier. */
152 } while (*id != '\0');
153 }
154 else
155 abort (); /* Should have been validated earlier. */
156
157 return TRUE;
158 }
159