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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" |
f9253394 | 4 | |
3af51928 AJ |
5 | struct idx_entry |
6 | { | |
3af51928 | 7 | off_t offset; |
c41a4a94 NP |
8 | const unsigned char *sha1; |
9 | unsigned int nr; | |
3af51928 AJ |
10 | }; |
11 | ||
12 | static int compare_entries(const void *e1, const void *e2) | |
13 | { | |
14 | const struct idx_entry *entry1 = e1; | |
15 | const struct idx_entry *entry2 = e2; | |
16 | if (entry1->offset < entry2->offset) | |
17 | return -1; | |
18 | if (entry1->offset > entry2->offset) | |
19 | return 1; | |
20 | return 0; | |
21 | } | |
22 | ||
c41a4a94 NP |
23 | int check_pack_crc(struct packed_git *p, struct pack_window **w_curs, |
24 | off_t offset, off_t len, unsigned int nr) | |
25 | { | |
26 | const uint32_t *index_crc; | |
27 | uint32_t data_crc = crc32(0, Z_NULL, 0); | |
28 | ||
29 | do { | |
30 | unsigned int avail; | |
31 | void *data = use_pack(p, w_curs, offset, &avail); | |
32 | if (avail > len) | |
33 | avail = len; | |
34 | data_crc = crc32(data_crc, data, avail); | |
35 | offset += avail; | |
36 | len -= avail; | |
37 | } while (len); | |
38 | ||
39 | index_crc = p->index_data; | |
40 | index_crc += 2 + 256 + p->num_objects * (20/4) + nr; | |
41 | ||
42 | return data_crc != ntohl(*index_crc); | |
43 | } | |
44 | ||
03e79c88 SP |
45 | static int verify_packfile(struct packed_git *p, |
46 | struct pack_window **w_curs) | |
f9253394 | 47 | { |
c4001d92 | 48 | off_t index_size = p->index_size; |
42873078 | 49 | const unsigned char *index_base = p->index_data; |
9126f009 | 50 | git_SHA_CTX ctx; |
62413604 | 51 | unsigned char sha1[20], *pack_sig; |
4277c670 | 52 | off_t offset = 0, pack_sig_ofs = 0; |
326bf396 | 53 | uint32_t nr_objects, i; |
62413604 | 54 | int err = 0; |
3af51928 | 55 | struct idx_entry *entries; |
f9253394 | 56 | |
079afb18 SP |
57 | /* Note that the pack header checks are actually performed by |
58 | * use_pack when it first opens the pack file. If anything | |
59 | * goes wrong during those checks then the call will die out | |
60 | * immediately. | |
61 | */ | |
f9253394 | 62 | |
9126f009 | 63 | git_SHA1_Init(&ctx); |
4277c670 | 64 | do { |
079afb18 SP |
65 | unsigned int remaining; |
66 | unsigned char *in = use_pack(p, w_curs, offset, &remaining); | |
67 | offset += remaining; | |
4277c670 MH |
68 | if (!pack_sig_ofs) |
69 | pack_sig_ofs = p->pack_size - 20; | |
62413604 NP |
70 | if (offset > pack_sig_ofs) |
71 | remaining -= (unsigned int)(offset - pack_sig_ofs); | |
9126f009 | 72 | git_SHA1_Update(&ctx, in, remaining); |
4277c670 | 73 | } while (offset < pack_sig_ofs); |
9126f009 | 74 | git_SHA1_Final(sha1, &ctx); |
62413604 NP |
75 | pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL); |
76 | if (hashcmp(sha1, pack_sig)) | |
77 | err = error("%s SHA1 checksum mismatch", | |
78 | p->pack_name); | |
79 | if (hashcmp(index_base + index_size - 40, pack_sig)) | |
80 | err = error("%s SHA1 does not match its inddex", | |
81 | p->pack_name); | |
079afb18 | 82 | unuse_pack(w_curs); |
f3bf9224 JH |
83 | |
84 | /* Make sure everything reachable from idx is valid. Since we | |
85 | * have verified that nr_objects matches between idx and pack, | |
86 | * we do not do scan-streaming check on the pack file. | |
87 | */ | |
57059091 | 88 | nr_objects = p->num_objects; |
c41a4a94 NP |
89 | entries = xmalloc((nr_objects + 1) * sizeof(*entries)); |
90 | entries[nr_objects].offset = pack_sig_ofs; | |
3af51928 AJ |
91 | /* first sort entries by pack offset, since unpacking them is more efficient that way */ |
92 | for (i = 0; i < nr_objects; i++) { | |
93 | entries[i].sha1 = nth_packed_object_sha1(p, i); | |
94 | if (!entries[i].sha1) | |
95 | die("internal error pack-check nth-packed-object"); | |
99093238 | 96 | entries[i].offset = nth_packed_object_offset(p, i); |
c41a4a94 | 97 | entries[i].nr = i; |
3af51928 AJ |
98 | } |
99 | qsort(entries, nr_objects, sizeof(*entries), compare_entries); | |
100 | ||
62413604 | 101 | for (i = 0; i < nr_objects; i++) { |
f3bf9224 | 102 | void *data; |
21666f1a | 103 | enum object_type type; |
c4001d92 | 104 | unsigned long size; |
f3bf9224 | 105 | |
c41a4a94 NP |
106 | if (p->index_version > 1) { |
107 | off_t offset = entries[i].offset; | |
108 | off_t len = entries[i+1].offset - offset; | |
109 | unsigned int nr = entries[i].nr; | |
110 | if (check_pack_crc(p, w_curs, offset, len, nr)) | |
111 | err = error("index CRC mismatch for object %s " | |
112 | "from %s at offset %"PRIuMAX"", | |
113 | sha1_to_hex(entries[i].sha1), | |
114 | p->pack_name, (uintmax_t)offset); | |
115 | } | |
3af51928 | 116 | data = unpack_entry(p, entries[i].offset, &type, &size); |
f3bf9224 | 117 | if (!data) { |
62413604 NP |
118 | err = error("cannot unpack %s from %s at offset %"PRIuMAX"", |
119 | sha1_to_hex(entries[i].sha1), p->pack_name, | |
120 | (uintmax_t)entries[i].offset); | |
121 | break; | |
f3bf9224 | 122 | } |
3af51928 | 123 | if (check_sha1_signature(entries[i].sha1, data, size, typename(type))) { |
1038f0c0 | 124 | err = error("packed %s from %s is corrupt", |
3af51928 | 125 | sha1_to_hex(entries[i].sha1), p->pack_name); |
f3bf9224 | 126 | free(data); |
62413604 | 127 | break; |
f3bf9224 JH |
128 | } |
129 | free(data); | |
130 | } | |
3af51928 | 131 | free(entries); |
f3bf9224 JH |
132 | |
133 | return err; | |
f9253394 JH |
134 | } |
135 | ||
77d3ecee | 136 | int verify_pack(struct packed_git *p) |
f9253394 | 137 | { |
d079837e SP |
138 | off_t index_size; |
139 | const unsigned char *index_base; | |
9126f009 | 140 | git_SHA_CTX ctx; |
f9253394 | 141 | unsigned char sha1[20]; |
62413604 NP |
142 | int err = 0; |
143 | struct pack_window *w_curs = NULL; | |
f9253394 | 144 | |
d079837e SP |
145 | if (open_pack_index(p)) |
146 | return error("packfile %s index not opened", p->pack_name); | |
147 | index_size = p->index_size; | |
148 | index_base = p->index_data; | |
149 | ||
f9253394 | 150 | /* Verify SHA1 sum of the index file */ |
9126f009 NP |
151 | git_SHA1_Init(&ctx); |
152 | git_SHA1_Update(&ctx, index_base, (unsigned int)(index_size - 20)); | |
153 | git_SHA1_Final(sha1, &ctx); | |
42873078 | 154 | if (hashcmp(sha1, index_base + index_size - 20)) |
62413604 | 155 | err = error("Packfile index for %s SHA1 mismatch", |
f3bf9224 JH |
156 | p->pack_name); |
157 | ||
62413604 NP |
158 | /* Verify pack file */ |
159 | err |= verify_packfile(p, &w_curs); | |
160 | unuse_pack(&w_curs); | |
f3bf9224 | 161 | |
62413604 | 162 | return err; |
f9253394 | 163 | } |