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authorVladimir Dronnikov <dronnikov@gmail.com>2009-10-15 09:24:25 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2009-10-15 09:24:25 +0200
commitdb67a20595be279e7db9f5f8e27bd94534efb8d4 (patch)
tree0263d0ac18ff70781d9a3074f12f5abcd2e18dfc /util-linux
parent7eabffafa5b6faaaa87ff8ba0efbf637aaa364e8 (diff)
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move generate_uuid from mkswap to libbb
Signed-off-by: Vladimir Dronnikov <dronnikov@gmail.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'util-linux')
-rw-r--r--util-linux/mkswap.c92
1 files changed, 13 insertions, 79 deletions
diff --git a/util-linux/mkswap.c b/util-linux/mkswap.c
index f71884340..226831bba 100644
--- a/util-linux/mkswap.c
+++ b/util-linux/mkswap.c
@@ -50,84 +50,6 @@ static void mkswap_selinux_setcontext(int fd, const char *path)
50# define mkswap_selinux_setcontext(fd, path) ((void)0) 50# define mkswap_selinux_setcontext(fd, path) ((void)0)
51#endif 51#endif
52 52
53#if ENABLE_FEATURE_MKSWAP_UUID
54static void mkswap_generate_uuid(uint8_t *buf)
55{
56 /* http://www.ietf.org/rfc/rfc4122.txt
57 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
58 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
59 * | time_low |
60 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
61 * | time_mid | time_hi_and_version |
62 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
63 * |clk_seq_and_variant | node (0-1) |
64 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
65 * | node (2-5) |
66 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
67 * IOW, uuid has this layout:
68 * uint32_t time_low (big endian)
69 * uint16_t time_mid (big endian)
70 * uint16_t time_hi_and_version (big endian)
71 * version is a 4-bit field:
72 * 1 Time-based
73 * 2 DCE Security, with embedded POSIX UIDs
74 * 3 Name-based (MD5)
75 * 4 Randomly generated
76 * 5 Name-based (SHA-1)
77 * uint16_t clk_seq_and_variant (big endian)
78 * variant is a 3-bit field:
79 * 0xx Reserved, NCS backward compatibility
80 * 10x The variant specified in rfc4122
81 * 110 Reserved, Microsoft backward compatibility
82 * 111 Reserved for future definition
83 * uint8_t node[6]
84 *
85 * For version 4, these bits are set/cleared:
86 * time_hi_and_version & 0x0fff | 0x4000
87 * clk_seq_and_variant & 0x3fff | 0x8000
88 */
89 pid_t pid;
90 int i;
91 char uuid_string[32];
92
93 i = open("/dev/urandom", O_RDONLY);
94 if (i >= 0) {
95 read(i, buf, 16);
96 close(i);
97 }
98 /* Paranoia. /dev/urandom may be missing.
99 * rand() is guaranteed to generate at least [0, 2^15) range,
100 * but lowest bits in some libc are not so "random". */
101 srand(monotonic_us());
102 pid = getpid();
103 while (1) {
104 for (i = 0; i < 16; i++)
105 buf[i] ^= rand() >> 5;
106 if (pid == 0)
107 break;
108 srand(pid);
109 pid = 0;
110 }
111
112 /* version = 4 */
113 buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40;
114 /* variant = 10x */
115 buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80;
116
117 bin2hex(uuid_string, (void*) buf, 16);
118 /* f.e. UUID=dfd9c173-be52-4d27-99a5-c34c6c2ff55f */
119 printf("UUID=%.8s" "-%.4s-%.4s-%.4s-%.12s\n",
120 uuid_string,
121 uuid_string+8,
122 uuid_string+8+4,
123 uuid_string+8+4+4,
124 uuid_string+8+4+4+4
125 );
126}
127#else
128# define mkswap_generate_uuid(buf) ((void)0)
129#endif
130
131#if 0 /* from Linux 2.6.23 */ 53#if 0 /* from Linux 2.6.23 */
132/* 54/*
133 * Magic header for a swap area. The first part of the union is 55 * Magic header for a swap area. The first part of the union is
@@ -190,7 +112,19 @@ int mkswap_main(int argc, char **argv)
190 // Make a header. hdr is zero-filled so far... 112 // Make a header. hdr is zero-filled so far...
191 hdr[0] = 1; 113 hdr[0] = 1;
192 hdr[1] = (len / pagesize) - 1; 114 hdr[1] = (len / pagesize) - 1;
193 mkswap_generate_uuid((void*) &hdr[3]); 115#if ENABLE_FEATURE_MKSWAP_UUID
116 char uuid_string[32];
117 generate_uuid((void*) &hdr[3]);
118 bin2hex(uuid_string, (void*) &hdr[3], 16);
119 /* f.e. UUID=dfd9c173-be52-4d27-99a5-c34c6c2ff55f */
120 printf("UUID=%.8s" "-%.4s-%.4s-%.4s-%.12s\n",
121 uuid_string,
122 uuid_string+8,
123 uuid_string+8+4,
124 uuid_string+8+4+4,
125 uuid_string+8+4+4+4
126 );
127#endif
194 128
195 // Write the header. Sync to disk because some kernel versions check 129 // Write the header. Sync to disk because some kernel versions check
196 // signature on disk (not in cache) during swapon. 130 // signature on disk (not in cache) during swapon.