tverifyarena.c - plan9port - [fork] Plan 9 from user space
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tverifyarena.c (5993B)
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1 #include "stdinc.h"
2 #include "dat.h"
3 #include "fns.h"
4
5 static int verbose;
6 static int fd;
7 static uchar *data;
8 static int blocksize;
9 static int sleepms;
10 static vlong offset0;
11
12 void
13 usage(void)
14 {
15 fprint(2, "usage: verifyarena [-b blocksize] [-s ms] [-v] [arenapart [name...]]\n");
16 threadexitsall(0);
17 }
18
19 static int
20 preadblock(uchar *buf, int n, vlong off)
21 {
22 int nr, m;
23
24 for(nr = 0; nr < n; nr += m){
25 m = n - nr;
26 m = pread(fd, &buf[nr], m, offset0+off+nr);
27 if(m <= 0){
28 if(m == 0)
29 werrstr("early eof");
30 return -1;
31 }
32 }
33 return 0;
34 }
35
36 static int
37 readblock(uchar *buf, int n)
38 {
39 int nr, m;
40
41 for(nr = 0; nr < n; nr += m){
42 m = n - nr;
43 m = read(fd, &buf[nr], m);
44 if(m <= 0){
45 if(m == 0)
46 werrstr("early eof");
47 return -1;
48 }
49 }
50 return 0;
51 }
52
53 static void
54 verifyarena(char *name, vlong len)
55 {
56 Arena arena;
57 ArenaHead head;
58 DigestState s;
59 u64int n, e;
60 u32int bs;
61 u8int score[VtScoreSize];
62
63 if(verbose)
64 fprint(2, "%T verify %s\n", name);
65
66 memset(&arena, 0, sizeof arena);
67 memset(&s, 0, sizeof s);
68
69 /*
70 * read a little bit, which will include the header
71 */
72 if(readblock(data, HeadSize) < 0){
73 fprint(2, "%T %s: reading header: %r\n", name);
74 return;
75 }
76 sha1(data, HeadSize, nil, &s);
77 if(unpackarenahead(&head, data) < 0){
78 fprint(2, "%T %s: corrupt arena header: %r\n", name);
79 return;
80 }
81 if(head.version != ArenaVersion4 && head.version != ArenaVersion5)
82 fprint(2, "%T %s: warning: unknown arena version %d\n", name, head.version);
83 if(len != 0 && len != head.size)
84 fprint(2, "%T %s: warning: unexpected length %lld != %lld\n", name, head.size, len);
85 if(strcmp(name, "<stdin>") != 0 && strcmp(head.name, name) != 0)
86 fprint(2, "%T %s: warning: unexpected name %s\n", name, head.name);
87
88 /*
89 * now we know how much to read
90 * read everything but the last block, which is special
91 */
92 e = head.size - head.blocksize;
93 bs = blocksize;
94 for(n = HeadSize; n < e; n += bs){
95 if(n + bs > e)
96 bs = e - n;
97 if(readblock(data, bs) < 0){
98 fprint(2, "%T %s: read data: %r\n", name);
99 return;
100 }
101 sha1(data, bs, nil, &s);
102 if(sleepms)
103 sleep(sleepms);
104 }
105
106 /*
107 * read the last block update the sum.
108 * the sum is calculated assuming the slot for the sum is zero.
109 */
110 bs = head.blocksize;
111 if(readblock(data, bs) < 0){
112 fprint(2, "%T %s: read last block: %r\n", name);
113 return;
114 }
115 sha1(data, bs-VtScoreSize, nil, &s);
116 sha1(zeroscore, VtScoreSize, nil, &s);
117 sha1(nil, 0, score, &s);
118
119 /*
120 * validity check on the trailer
121 */
122 arena.blocksize = head.blocksize;
123 if(unpackarena(&arena, data) < 0){
124 fprint(2, "%T %s: corrupt arena trailer: %r\n", name);
125 return;
126 }
127 scorecp(arena.score, &data[arena.blocksize - VtScoreSize]);
128
129 if(namecmp(arena.name, head.name) != 0){
130 fprint(2, "%T %s: wrong name in trailer: %s vs. %s\n",
131 name, head.name, arena.name);
132 return;
133 }
134 if(arena.version != head.version){
135 fprint(2, "%T %s: wrong version in trailer: %d vs. %d\n",
136 name, head.version, arena.version);
137 return;
138 }
139 arena.size = head.size - 2 * head.blocksize;
140
141 /*
142 * check for no checksum or the same
143 */
144 if(scorecmp(score, arena.score) == 0) {
145 if(verbose)
146 fprint(2, "%T %s: verified score\n", name);
147 } else if(scorecmp(zeroscore, arena.score) == 0) {
148 if(verbose || arena.diskstats.used > 0)
149 fprint(2, "%T %s: unsealed %,lld bytes\n", name, arena.diskstats.used);
150 } else{
151 fprint(2, "%T %s: mismatch checksum - found=%V calculated=%V\n",
152 name, arena.score, score);
153 return;
154 }
155 if(verbose > 1)
156 printarena(2, &arena);
157 }
158
159 static int
160 shouldcheck(char *name, char **s, int n)
161 {
162 int i;
163
164 if(n == 0)
165 return 1;
166
167 for(i=0; i<n; i++){
168 if(s[i] && strcmp(name, s[i]) == 0){
169 s[i] = nil;
170 return 1;
171 }
172 }
173 return 0;
174 }
175
176 void
177 threadmain(int argc, char *argv[])
178 {
179 int i, nline;
180 char *p, *q, *table, *f[10], line[256];
181 vlong start, stop;
182 ArenaPart ap;
183 Part *part;
184
185 needzeroscore();
186 ventifmtinstall();
187 blocksize = MaxIoSize;
188 ARGBEGIN{
189 case 'b':
190 blocksize = unittoull(EARGF(usage()));
191 break;
192 case 's':
193 sleepms = atoi(EARGF(usage()));
194 break;
195 case 'v':
196 verbose++;
197 break;
198 default:
199 usage();
200 break;
201 }ARGEND
202
203 data = vtmalloc(MaxIo + blocksize);
204 if((uintptr)data % MaxIo)
205 data += MaxIo - (uintptr)data%MaxIo;
206
207 if(argc == 0){
208 fd = 0;
209 verifyarena("<stdin>", 0);
210 threadexitsall(nil);
211 }
212
213 if((part = initpart(argv[0], OREAD)) == nil)
214 sysfatal("open partition %s: %r", argv[0]);
215 fd = part->fd;
216 offset0 = part->offset;
217
218 if(preadblock(data, 8192, PartBlank) < 0)
219 sysfatal("read arena part header: %r");
220 if(unpackarenapart(&ap, data) < 0)
221 sysfatal("corrupted arena part header: %r");
222 if(verbose)
223 fprint(2, "%T # arena part version=%d blocksize=%d arenabase=%d\n",
224 ap.version, ap.blocksize, ap.arenabase);
225 ap.tabbase = (PartBlank+HeadSize+ap.blocksize-1)&~(ap.blocksize-1);
226 ap.tabsize = ap.arenabase - ap.tabbase;
227 table = malloc(ap.tabsize+1);
228 if(preadblock((uchar*)table, ap.tabsize, ap.tabbase) < 0)
229 sysfatal("reading arena part directory: %r");
230 table[ap.tabsize] = 0;
231
232 nline = atoi(table);
233 p = strchr(table, '\n');
234 if(p)
235 p++;
236 for(i=0; i<nline; i++){
237 if(p == nil){
238 fprint(2, "%T warning: unexpected arena table end\n");
239 break;
240 }
241 q = strchr(p, '\n');
242 if(q)
243 *q++ = 0;
244 if(strlen(p) >= sizeof line){
245 fprint(2, "%T warning: long arena table line: %s\n", p);
246 p = q;
247 continue;
248 }
249 strcpy(line, p);
250 memset(f, 0, sizeof f);
251 if(tokenize(line, f, nelem(f)) < 3){
252 fprint(2, "%T warning: bad arena table line: %s\n", p);
253 p = q;
254 continue;
255 }
256 p = q;
257 if(shouldcheck(f[0], argv+1, argc-1)){
258 start = strtoull(f[1], 0, 0);
259 stop = strtoull(f[2], 0, 0);
260 if(stop <= start){
261 fprint(2, "%T %s: bad start,stop %lld,%lld\n", f[0], stop, start);
262 continue;
263 }
264 if(seek(fd, offset0+start, 0) < 0)
265 fprint(2, "%T %s: seek to start: %r\n", f[0]);
266 verifyarena(f[0], stop - start);
267 }
268 }
269 for(i=1; i<argc; i++)
270 if(argv[i] != 0)
271 fprint(2, "%T %s: did not find arena\n", argv[i]);
272
273 threadexitsall(nil);
274 }