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Commit | Line | Data |
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f9253394 JH |
1 | #include "cache.h" |
2 | #include "pack.h" | |
70f5d5d3 | 3 | #include "pack-revindex.h" |
1e49f22f | 4 | #include "progress.h" |
0317f455 | 5 | #include "packfile.h" |
f9253394 | 6 | |
9cba13ca | 7 | struct idx_entry { |
3af51928 | 8 | off_t offset; |
9fd75046 | 9 | union idx_entry_object { |
10 | const unsigned char *hash; | |
11 | struct object_id *oid; | |
12 | } oid; | |
c41a4a94 | 13 | unsigned int nr; |
3af51928 AJ |
14 | }; |
15 | ||
16 | static int compare_entries(const void *e1, const void *e2) | |
17 | { | |
18 | const struct idx_entry *entry1 = e1; | |
19 | const struct idx_entry *entry2 = e2; | |
20 | if (entry1->offset < entry2->offset) | |
21 | return -1; | |
22 | if (entry1->offset > entry2->offset) | |
23 | return 1; | |
24 | return 0; | |
25 | } | |
26 | ||
c41a4a94 NP |
27 | int check_pack_crc(struct packed_git *p, struct pack_window **w_curs, |
28 | off_t offset, off_t len, unsigned int nr) | |
29 | { | |
30 | const uint32_t *index_crc; | |
1e4cd68c | 31 | uint32_t data_crc = crc32(0, NULL, 0); |
c41a4a94 NP |
32 | |
33 | do { | |
ef49a7a0 | 34 | unsigned long avail; |
c41a4a94 NP |
35 | void *data = use_pack(p, w_curs, offset, &avail); |
36 | if (avail > len) | |
37 | avail = len; | |
38 | data_crc = crc32(data_crc, data, avail); | |
39 | offset += avail; | |
40 | len -= avail; | |
41 | } while (len); | |
42 | ||
43 | index_crc = p->index_data; | |
ccc12e06 | 44 | index_crc += 2 + 256 + p->num_objects * (the_hash_algo->rawsz/4) + nr; |
c41a4a94 NP |
45 | |
46 | return data_crc != ntohl(*index_crc); | |
47 | } | |
48 | ||
03e79c88 | 49 | static int verify_packfile(struct packed_git *p, |
c9486eb0 | 50 | struct pack_window **w_curs, |
1e49f22f NTND |
51 | verify_fn fn, |
52 | struct progress *progress, uint32_t base_count) | |
53 | ||
f9253394 | 54 | { |
c4001d92 | 55 | off_t index_size = p->index_size; |
42873078 | 56 | const unsigned char *index_base = p->index_data; |
ccc12e06 | 57 | git_hash_ctx ctx; |
9fd75046 | 58 | unsigned char hash[GIT_MAX_RAWSZ], *pack_sig; |
4277c670 | 59 | off_t offset = 0, pack_sig_ofs = 0; |
326bf396 | 60 | uint32_t nr_objects, i; |
62413604 | 61 | int err = 0; |
3af51928 | 62 | struct idx_entry *entries; |
f9253394 | 63 | |
a9445d85 JK |
64 | if (!is_pack_valid(p)) |
65 | return error("packfile %s cannot be accessed", p->pack_name); | |
f9253394 | 66 | |
ccc12e06 | 67 | the_hash_algo->init_fn(&ctx); |
4277c670 | 68 | do { |
ef49a7a0 | 69 | unsigned long remaining; |
079afb18 SP |
70 | unsigned char *in = use_pack(p, w_curs, offset, &remaining); |
71 | offset += remaining; | |
4277c670 | 72 | if (!pack_sig_ofs) |
ccc12e06 | 73 | pack_sig_ofs = p->pack_size - the_hash_algo->rawsz; |
62413604 NP |
74 | if (offset > pack_sig_ofs) |
75 | remaining -= (unsigned int)(offset - pack_sig_ofs); | |
ccc12e06 | 76 | the_hash_algo->update_fn(&ctx, in, remaining); |
4277c670 | 77 | } while (offset < pack_sig_ofs); |
ccc12e06 | 78 | the_hash_algo->final_fn(hash, &ctx); |
62413604 | 79 | pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL); |
9fd75046 | 80 | if (hashcmp(hash, pack_sig)) |
ccc12e06 | 81 | err = error("%s pack checksum mismatch", |
62413604 | 82 | p->pack_name); |
ccc12e06 | 83 | if (hashcmp(index_base + index_size - the_hash_algo->hexsz, pack_sig)) |
84 | err = error("%s pack checksum does not match its index", | |
62413604 | 85 | p->pack_name); |
079afb18 | 86 | unuse_pack(w_curs); |
f3bf9224 JH |
87 | |
88 | /* Make sure everything reachable from idx is valid. Since we | |
89 | * have verified that nr_objects matches between idx and pack, | |
90 | * we do not do scan-streaming check on the pack file. | |
91 | */ | |
57059091 | 92 | nr_objects = p->num_objects; |
b32fa95f | 93 | ALLOC_ARRAY(entries, nr_objects + 1); |
c41a4a94 | 94 | entries[nr_objects].offset = pack_sig_ofs; |
3af51928 AJ |
95 | /* first sort entries by pack offset, since unpacking them is more efficient that way */ |
96 | for (i = 0; i < nr_objects; i++) { | |
9fd75046 | 97 | entries[i].oid.hash = nth_packed_object_sha1(p, i); |
98 | if (!entries[i].oid.hash) | |
3af51928 | 99 | die("internal error pack-check nth-packed-object"); |
99093238 | 100 | entries[i].offset = nth_packed_object_offset(p, i); |
c41a4a94 | 101 | entries[i].nr = i; |
3af51928 | 102 | } |
9ed0d8d6 | 103 | QSORT(entries, nr_objects, compare_entries); |
3af51928 | 104 | |
62413604 | 105 | for (i = 0; i < nr_objects; i++) { |
f3bf9224 | 106 | void *data; |
21666f1a | 107 | enum object_type type; |
c4001d92 | 108 | unsigned long size; |
ec9d2249 NTND |
109 | off_t curpos; |
110 | int data_valid; | |
f3bf9224 | 111 | |
c41a4a94 NP |
112 | if (p->index_version > 1) { |
113 | off_t offset = entries[i].offset; | |
114 | off_t len = entries[i+1].offset - offset; | |
115 | unsigned int nr = entries[i].nr; | |
116 | if (check_pack_crc(p, w_curs, offset, len, nr)) | |
117 | err = error("index CRC mismatch for object %s " | |
118 | "from %s at offset %"PRIuMAX"", | |
9fd75046 | 119 | oid_to_hex(entries[i].oid.oid), |
c41a4a94 NP |
120 | p->pack_name, (uintmax_t)offset); |
121 | } | |
ec9d2249 NTND |
122 | |
123 | curpos = entries[i].offset; | |
124 | type = unpack_object_header(p, w_curs, &curpos, &size); | |
125 | unuse_pack(w_curs); | |
126 | ||
127 | if (type == OBJ_BLOB && big_file_threshold <= size) { | |
128 | /* | |
17e65451 | 129 | * Let check_object_signature() check it with |
ec9d2249 NTND |
130 | * the streaming interface; no point slurping |
131 | * the data in-core only to discard. | |
132 | */ | |
133 | data = NULL; | |
134 | data_valid = 0; | |
135 | } else { | |
136 | data = unpack_entry(p, entries[i].offset, &type, &size); | |
137 | data_valid = 1; | |
138 | } | |
139 | ||
140 | if (data_valid && !data) | |
62413604 | 141 | err = error("cannot unpack %s from %s at offset %"PRIuMAX"", |
9fd75046 | 142 | oid_to_hex(entries[i].oid.oid), p->pack_name, |
62413604 | 143 | (uintmax_t)entries[i].offset); |
17e65451 | 144 | else if (check_object_signature(entries[i].oid.oid, data, size, type_name(type))) |
1038f0c0 | 145 | err = error("packed %s from %s is corrupt", |
9fd75046 | 146 | oid_to_hex(entries[i].oid.oid), p->pack_name); |
c9486eb0 NTND |
147 | else if (fn) { |
148 | int eaten = 0; | |
9fd75046 | 149 | err |= fn(entries[i].oid.oid, type, size, data, &eaten); |
c9486eb0 NTND |
150 | if (eaten) |
151 | data = NULL; | |
152 | } | |
1e49f22f NTND |
153 | if (((base_count + i) & 1023) == 0) |
154 | display_progress(progress, base_count + i); | |
f3bf9224 | 155 | free(data); |
1e49f22f | 156 | |
f3bf9224 | 157 | } |
1e49f22f | 158 | display_progress(progress, base_count + i); |
3af51928 | 159 | free(entries); |
f3bf9224 JH |
160 | |
161 | return err; | |
f9253394 JH |
162 | } |
163 | ||
9b0aa728 | 164 | int verify_pack_index(struct packed_git *p) |
f9253394 | 165 | { |
d079837e SP |
166 | off_t index_size; |
167 | const unsigned char *index_base; | |
ccc12e06 | 168 | git_hash_ctx ctx; |
169 | unsigned char hash[GIT_MAX_RAWSZ]; | |
62413604 | 170 | int err = 0; |
f9253394 | 171 | |
d079837e SP |
172 | if (open_pack_index(p)) |
173 | return error("packfile %s index not opened", p->pack_name); | |
174 | index_size = p->index_size; | |
175 | index_base = p->index_data; | |
176 | ||
f9253394 | 177 | /* Verify SHA1 sum of the index file */ |
ccc12e06 | 178 | the_hash_algo->init_fn(&ctx); |
179 | the_hash_algo->update_fn(&ctx, index_base, (unsigned int)(index_size - the_hash_algo->rawsz)); | |
180 | the_hash_algo->final_fn(hash, &ctx); | |
181 | if (hashcmp(hash, index_base + index_size - the_hash_algo->rawsz)) | |
182 | err = error("Packfile index for %s hash mismatch", | |
f3bf9224 | 183 | p->pack_name); |
9b0aa728 SP |
184 | return err; |
185 | } | |
186 | ||
1e49f22f NTND |
187 | int verify_pack(struct packed_git *p, verify_fn fn, |
188 | struct progress *progress, uint32_t base_count) | |
9b0aa728 SP |
189 | { |
190 | int err = 0; | |
191 | struct pack_window *w_curs = NULL; | |
192 | ||
193 | err |= verify_pack_index(p); | |
194 | if (!p->index_data) | |
195 | return -1; | |
f3bf9224 | 196 | |
1e49f22f | 197 | err |= verify_packfile(p, &w_curs, fn, progress, base_count); |
62413604 | 198 | unuse_pack(&w_curs); |
f3bf9224 | 199 | |
62413604 | 200 | return err; |
f9253394 | 201 | } |