chiark / gitweb /
Makefile: remove all the duplicated rules
[elogind.git] / extras / dasd_id / dasd_id.c
1 /*
2  * dasdlabel - read label from s390 block device
3  *
4  * Copyright (C) 2004 Arnd Bergmann <arnd@arndb.de>
5  *
6  *      This program is free software; you can redistribute it and/or modify it
7  *      under the terms of the GNU General Public License as published by the
8  *      Free Software Foundation version 2 of the License.
9  * 
10  *      This program is distributed in the hope that it will be useful, but
11  *      WITHOUT ANY WARRANTY; without even the implied warranty of
12  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  *      General Public License for more details.
14  * 
15  *      You should have received a copy of the GNU General Public License along
16  *      with this program; if not, write to the Free Software Foundation, Inc.,
17  *      675 Mass Ave, Cambridge, MA 02139, USA.
18  *
19  */
20
21 #ifndef _GNU_SOURCE
22 #define _GNU_SOURCE 1
23 #endif
24
25 #ifdef HAVE_CONFIG_H
26 #  include <config.h>
27 #endif
28
29 #include <stdlib.h>
30 #include <stdio.h>
31 #include <string.h>
32 #include <unistd.h>
33 #include <fcntl.h>
34 #include <errno.h>
35 #include <sys/ioctl.h>
36
37 #include "../../logging.h"
38 #include "../../udev_utils.h"
39
40 #ifdef USE_LOG
41 void log_message(int priority, const char *format, ...)
42 {
43         va_list args;
44         static int udev_log = -1;
45
46         if (udev_log == -1) {
47                 const char *value;
48
49                 value = getenv("UDEV_LOG");
50                 if (value)
51                         udev_log = log_priority(value);
52                 else
53                         udev_log = LOG_ERR;
54         }
55
56         if (priority > udev_log)
57                 return;
58
59         va_start(args, format);
60         vsyslog(priority, format, args);
61         va_end(args);
62 }
63 #endif
64
65 /*
66  * Only compile this on S/390. Doesn't make any sense
67  * for other architectures.
68  */
69
70 static unsigned char EBCtoASC[256] =
71 {
72 /* 0x00  NUL   SOH   STX   ETX  *SEL    HT  *RNL   DEL */
73         0x00, 0x01, 0x02, 0x03, 0x07, 0x09, 0x07, 0x7F,
74 /* 0x08  -GE  -SPS  -RPT    VT    FF    CR    SO    SI */
75         0x07, 0x07, 0x07, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
76 /* 0x10  DLE   DC1   DC2   DC3  -RES   -NL    BS  -POC
77                                 -ENP  ->LF             */
78         0x10, 0x11, 0x12, 0x13, 0x07, 0x0A, 0x08, 0x07,
79 /* 0x18  CAN    EM  -UBS  -CU1  -IFS  -IGS  -IRS  -ITB
80                                                   -IUS */
81         0x18, 0x19, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
82 /* 0x20  -DS  -SOS    FS  -WUS  -BYP    LF   ETB   ESC
83                                 -INP                   */
84         0x07, 0x07, 0x1C, 0x07, 0x07, 0x0A, 0x17, 0x1B,
85 /* 0x28  -SA  -SFE   -SM  -CSP  -MFA   ENQ   ACK   BEL
86                      -SW                               */
87         0x07, 0x07, 0x07, 0x07, 0x07, 0x05, 0x06, 0x07,
88 /* 0x30 ----  ----   SYN   -IR   -PP  -TRN  -NBS   EOT */
89         0x07, 0x07, 0x16, 0x07, 0x07, 0x07, 0x07, 0x04,
90 /* 0x38 -SBS   -IT  -RFF  -CU3   DC4   NAK  ----   SUB */
91         0x07, 0x07, 0x07, 0x07, 0x14, 0x15, 0x07, 0x1A,
92 /* 0x40   SP   RSP           ä              ----       */
93         0x20, 0xFF, 0x83, 0x84, 0x85, 0xA0, 0x07, 0x86,
94 /* 0x48                      .     <     (     +     | */
95         0x87, 0xA4, 0x9B, 0x2E, 0x3C, 0x28, 0x2B, 0x7C,
96 /* 0x50    &                                      ---- */
97         0x26, 0x82, 0x88, 0x89, 0x8A, 0xA1, 0x8C, 0x07,
98 /* 0x58          ß     !     $     *     )     ;       */
99         0x8D, 0xE1, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0xAA,
100 /* 0x60    -     /  ----     Ä  ----  ----  ----       */
101         0x2D, 0x2F, 0x07, 0x8E, 0x07, 0x07, 0x07, 0x8F,
102 /* 0x68             ----     ,     %     _     >     ? */
103         0x80, 0xA5, 0x07, 0x2C, 0x25, 0x5F, 0x3E, 0x3F,
104 /* 0x70  ---        ----  ----  ----  ----  ----  ---- */
105         0x07, 0x90, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
106 /* 0x78    *     `     :     #     @     '     =     " */
107         0x70, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22,
108 /* 0x80    *     a     b     c     d     e     f     g */
109         0x07, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
110 /* 0x88    h     i              ----  ----  ----       */
111         0x68, 0x69, 0xAE, 0xAF, 0x07, 0x07, 0x07, 0xF1,
112 /* 0x90    °     j     k     l     m     n     o     p */
113         0xF8, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70,
114 /* 0x98    q     r                    ----        ---- */
115         0x71, 0x72, 0xA6, 0xA7, 0x91, 0x07, 0x92, 0x07,
116 /* 0xA0          ~     s     t     u     v     w     x */
117         0xE6, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
118 /* 0xA8    y     z              ----  ----  ----  ---- */
119         0x79, 0x7A, 0xAD, 0xAB, 0x07, 0x07, 0x07, 0x07,
120 /* 0xB0    ^                    ----     §  ----       */
121         0x5E, 0x9C, 0x9D, 0xFA, 0x07, 0x07, 0x07, 0xAC,
122 /* 0xB8       ----     [     ]  ----  ----  ----  ---- */
123         0xAB, 0x07, 0x5B, 0x5D, 0x07, 0x07, 0x07, 0x07,
124 /* 0xC0    {     A     B     C     D     E     F     G */
125         0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
126 /* 0xC8    H     I  ----           ö              ---- */
127         0x48, 0x49, 0x07, 0x93, 0x94, 0x95, 0xA2, 0x07,
128 /* 0xD0    }     J     K     L     M     N     O     P */
129         0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
130 /* 0xD8    Q     R  ----           ü                   */
131         0x51, 0x52, 0x07, 0x96, 0x81, 0x97, 0xA3, 0x98,
132 /* 0xE0    \           S     T     U     V     W     X */
133         0x5C, 0xF6, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
134 /* 0xE8    Y     Z        ----     Ö  ----  ----  ---- */
135         0x59, 0x5A, 0xFD, 0x07, 0x99, 0x07, 0x07, 0x07,
136 /* 0xF0    0     1     2     3     4     5     6     7 */
137         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
138 /* 0xF8    8     9  ----  ----     Ü  ----  ----  ---- */
139         0x38, 0x39, 0x07, 0x07, 0x9A, 0x07, 0x07, 0x07
140 };
141
142 static void vtoc_ebcdic_dec (const unsigned char *source, unsigned char *target, int l) 
143 {
144         int i;
145
146         for (i = 0; i < l; i++) 
147                 target[i]=(char)EBCtoASC[(unsigned char)(source[i])];
148 }
149
150 /*
151  * struct dasd_information_t
152  * represents any data about the data, which is visible to userspace
153  */
154 typedef struct dasd_information_t {
155         unsigned int devno;             /* S/390 devno */
156         unsigned int real_devno;        /* for aliases */
157         unsigned int schid;             /* S/390 subchannel identifier */
158         unsigned int cu_type  : 16;     /* from SenseID */
159         unsigned int cu_model :  8;     /* from SenseID */
160         unsigned int dev_type : 16;     /* from SenseID */
161         unsigned int dev_model : 8;     /* from SenseID */
162         unsigned int open_count;
163         unsigned int req_queue_len;
164         unsigned int chanq_len;         /* length of chanq */
165         char type[4];                   /* from discipline.name, 'none' for unknown */
166         unsigned int status;            /* current device level */
167         unsigned int label_block;       /* where to find the VOLSER */
168         unsigned int FBA_layout;        /* fixed block size (like AIXVOL) */
169         unsigned int characteristics_size;
170         unsigned int confdata_size;
171         char characteristics[64];       /* from read_device_characteristics */
172         char configuration_data[256];   /* from read_configuration_data */
173 } dasd_information_t;
174
175 #define DASD_IOCTL_LETTER        'D'
176 #define BIODASDINFO _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
177 #define BLKSSZGET _IO(0x12,104)
178
179 unsigned char serial[8];
180
181 static int dasd_id(int fd)
182 {
183         int blocksize;
184         dasd_information_t info;
185         unsigned char *data;
186         unsigned char *label_raw;
187
188         if (ioctl(fd, BIODASDINFO, &info) != 0) {
189                 dbg("not a dasd");
190                 return -1;
191         }
192
193                 if (ioctl(fd, BLKSSZGET, &blocksize) != 0) {
194                         err("failed to get blocksize");
195                         return -1;
196                 }
197
198                 if (lseek(fd,info.label_block * blocksize, SEEK_SET) == -1) {
199                         err("seek failed on dasd");
200                         return -1;
201                 }
202
203                 data = malloc(blocksize);
204                 if (data == NULL)
205                         return -1;
206
207                 if (read(fd, data, blocksize) == -1) {
208                         err("read disklabel failed");
209                         free(data);
210                         return -1;
211                 }
212
213                 if ((!info.FBA_layout) && (!strcmp(info.type, "ECKD")))
214                         label_raw = &data[8];
215                 else
216                         label_raw = &data[4];
217                 serial[6] = '\0';
218
219                 vtoc_ebcdic_dec(label_raw, serial, 6);
220                 free(data);
221
222                 return 0;
223         }
224
225 int main(int argc, char *argv[])
226 {
227         const char *node = NULL;
228         int i;
229         int export = 0;
230         int fd;
231         int rc = 0;
232
233         logging_init("dasd_id");
234
235         for (i = 1; i < argc; i++) {
236                 char *arg = argv[i];
237
238                 if (strcmp(arg, "--export") == 0) {
239                         export = 1;
240                 } else
241                         node = arg;
242         }
243         if (!node) {
244                 err("no node specified");
245                 rc = 1;
246                 goto exit;
247         }
248
249         fd = open(node, O_RDONLY);
250         if (fd < 0) {
251                 err("unable to open '%s'", node);
252                 rc = 1;
253                 goto exit;
254         }
255
256         if (dasd_id(fd) < 0) {
257                 err("dasd_id failed: %s", strerror(errno));
258                 rc = 1;
259         }
260
261         if (export) {
262                 printf("ID_TYPE=disk\n");
263                 printf("ID_SERIAL=%s\n",serial);
264                 printf("ID_BUS=ccw\n");
265         } else
266                 printf("%s\n", serial);
267
268         close(fd);
269 exit:
270         logging_close();
271         return rc;
272 }
273