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author | Vladimir Dronnikov <dronnikov@gmail.com> | 2009-10-15 09:24:25 +0200 |
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committer | Denys Vlasenko <vda.linux@googlemail.com> | 2009-10-15 09:24:25 +0200 |
commit | db67a20595be279e7db9f5f8e27bd94534efb8d4 (patch) | |
tree | 0263d0ac18ff70781d9a3074f12f5abcd2e18dfc /util-linux | |
parent | 7eabffafa5b6faaaa87ff8ba0efbf637aaa364e8 (diff) | |
download | busybox-w32-db67a20595be279e7db9f5f8e27bd94534efb8d4.tar.gz busybox-w32-db67a20595be279e7db9f5f8e27bd94534efb8d4.tar.bz2 busybox-w32-db67a20595be279e7db9f5f8e27bd94534efb8d4.zip |
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.c | 92 |
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 | ||
54 | static 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. |