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c182393f MT |
1 | /* |
2 | libloc - A library to determine the location of someone on the Internet | |
3 | ||
4 | Copyright (C) 2017 IPFire Development Team <info@ipfire.org> | |
5 | ||
6 | This library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | This library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | */ | |
16 | ||
c182393f MT |
17 | #include <endian.h> |
18 | #include <errno.h> | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <time.h> | |
23 | ||
24 | #include <loc/format.h> | |
25 | #include <loc/writer.h> | |
26 | ||
27 | #include "libloc-private.h" | |
28 | #include "as.h" | |
29 | ||
30 | struct loc_writer { | |
31 | struct loc_ctx* ctx; | |
32 | int refcount; | |
33 | ||
34 | struct loc_stringpool* pool; | |
35 | off_t vendor; | |
36 | off_t description; | |
37 | ||
38 | struct loc_as** as; | |
39 | size_t as_count; | |
40 | }; | |
41 | ||
42 | LOC_EXPORT int loc_writer_new(struct loc_ctx* ctx, struct loc_writer** writer) { | |
43 | struct loc_writer* w = calloc(1, sizeof(*w)); | |
44 | if (!w) | |
45 | return -ENOMEM; | |
46 | ||
47 | w->ctx = loc_ref(ctx); | |
48 | w->refcount = 1; | |
49 | ||
0e974d4b | 50 | int r = loc_stringpool_new(ctx, &w->pool); |
c182393f MT |
51 | if (r) { |
52 | loc_writer_unref(w); | |
53 | return r; | |
54 | } | |
55 | ||
56 | *writer = w; | |
57 | return 0; | |
58 | } | |
59 | ||
60 | LOC_EXPORT struct loc_writer* loc_writer_ref(struct loc_writer* writer) { | |
61 | writer->refcount++; | |
62 | ||
63 | return writer; | |
64 | } | |
65 | ||
66 | static void loc_writer_free(struct loc_writer* writer) { | |
67 | DEBUG(writer->ctx, "Releasing writer at %p\n", writer); | |
68 | ||
69 | // Unref all AS | |
70 | for (unsigned int i = 0; i < writer->as_count; i++) { | |
71 | loc_as_unref(writer->as[i]); | |
72 | } | |
73 | ||
74 | // Unref the string pool | |
75 | loc_stringpool_unref(writer->pool); | |
76 | ||
77 | loc_unref(writer->ctx); | |
78 | free(writer); | |
79 | } | |
80 | ||
81 | LOC_EXPORT struct loc_writer* loc_writer_unref(struct loc_writer* writer) { | |
82 | if (--writer->refcount > 0) | |
83 | return writer; | |
84 | ||
85 | loc_writer_free(writer); | |
86 | ||
87 | return NULL; | |
88 | } | |
89 | ||
90 | LOC_EXPORT const char* loc_writer_get_vendor(struct loc_writer* writer) { | |
91 | return loc_stringpool_get(writer->pool, writer->vendor); | |
92 | } | |
93 | ||
94 | LOC_EXPORT int loc_writer_set_vendor(struct loc_writer* writer, const char* vendor) { | |
95 | // Add the string to the string pool | |
96 | off_t offset = loc_stringpool_add(writer->pool, vendor); | |
97 | if (offset < 0) | |
98 | return offset; | |
99 | ||
100 | writer->vendor = offset; | |
101 | return 0; | |
102 | } | |
103 | ||
104 | LOC_EXPORT const char* loc_writer_get_description(struct loc_writer* writer) { | |
105 | return loc_stringpool_get(writer->pool, writer->description); | |
106 | } | |
107 | ||
108 | LOC_EXPORT int loc_writer_set_description(struct loc_writer* writer, const char* description) { | |
109 | // Add the string to the string pool | |
110 | off_t offset = loc_stringpool_add(writer->pool, description); | |
111 | if (offset < 0) | |
112 | return offset; | |
113 | ||
114 | writer->description = offset; | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static int __loc_as_cmp(const void* as1, const void* as2) { | |
119 | return loc_as_cmp(*(struct loc_as**)as1, *(struct loc_as**)as2); | |
120 | } | |
121 | ||
122 | LOC_EXPORT int loc_writer_add_as(struct loc_writer* writer, struct loc_as** as, uint32_t number) { | |
123 | int r = loc_as_new(writer->ctx, writer->pool, as, number); | |
124 | if (r) | |
125 | return r; | |
126 | ||
127 | // We have a new AS to add | |
128 | writer->as_count++; | |
129 | ||
130 | // Make space | |
131 | writer->as = realloc(writer->as, sizeof(*writer->as) * writer->as_count); | |
132 | if (!writer->as) | |
133 | return -ENOMEM; | |
134 | ||
135 | // Add as last element | |
136 | writer->as[writer->as_count - 1] = loc_as_ref(*as); | |
137 | ||
138 | // Sort everything | |
139 | qsort(writer->as, writer->as_count, sizeof(*writer->as), __loc_as_cmp); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static void make_magic(struct loc_writer* writer, struct loc_database_magic* magic) { | |
145 | // Copy magic bytes | |
146 | for (unsigned int i = 0; i < strlen(LOC_DATABASE_MAGIC); i++) | |
147 | magic->magic[i] = LOC_DATABASE_MAGIC[i]; | |
148 | ||
149 | // Set version | |
0676cd80 | 150 | magic->version = htobe16(LOC_DATABASE_VERSION); |
c182393f MT |
151 | } |
152 | ||
153 | static void align_page_boundary(off_t* offset, FILE* f) { | |
154 | // Move to next page boundary | |
155 | while (*offset % LOC_DATABASE_PAGE_SIZE > 0) | |
156 | *offset += fwrite("", 1, 1, f); | |
157 | } | |
158 | ||
159 | static int loc_database_write_pool(struct loc_writer* writer, | |
160 | struct loc_database_header_v0* header, off_t* offset, FILE* f) { | |
161 | // Save the offset of the pool section | |
162 | DEBUG(writer->ctx, "Pool starts at %jd bytes\n", *offset); | |
0676cd80 | 163 | header->pool_offset = htobe32(*offset); |
c182393f MT |
164 | |
165 | // Write the pool | |
166 | size_t pool_length = loc_stringpool_write(writer->pool, f); | |
167 | *offset += pool_length; | |
168 | ||
169 | DEBUG(writer->ctx, "Pool has a length of %zu bytes\n", pool_length); | |
0676cd80 | 170 | header->pool_length = htobe32(pool_length); |
c182393f MT |
171 | |
172 | return 0; | |
173 | } | |
174 | ||
175 | static int loc_database_write_as_section(struct loc_writer* writer, | |
176 | struct loc_database_header_v0* header, off_t* offset, FILE* f) { | |
177 | DEBUG(writer->ctx, "AS section starts at %jd bytes\n", *offset); | |
0676cd80 | 178 | header->as_offset = htobe32(*offset); |
c182393f MT |
179 | |
180 | size_t as_length = 0; | |
181 | ||
182 | struct loc_database_as_v0 as; | |
183 | for (unsigned int i = 0; i < writer->as_count; i++) { | |
184 | // Convert AS into database format | |
185 | loc_as_to_database_v0(writer->as[i], &as); | |
186 | ||
187 | // Write to disk | |
188 | offset += fwrite(&as, 1, sizeof(as), f); | |
189 | as_length += sizeof(as); | |
190 | } | |
191 | ||
192 | DEBUG(writer->ctx, "AS section has a length of %zu bytes\n", as_length); | |
0676cd80 | 193 | header->as_length = htobe32(as_length); |
c182393f MT |
194 | |
195 | return 0; | |
196 | } | |
197 | ||
198 | LOC_EXPORT int loc_writer_write(struct loc_writer* writer, FILE* f) { | |
199 | struct loc_database_magic magic; | |
200 | make_magic(writer, &magic); | |
201 | ||
202 | // Make the header | |
203 | struct loc_database_header_v0 header; | |
0676cd80 MT |
204 | header.vendor = htobe32(writer->vendor); |
205 | header.description = htobe32(writer->description); | |
c182393f MT |
206 | |
207 | time_t now = time(NULL); | |
208 | header.created_at = htobe64(now); | |
209 | ||
210 | int r; | |
211 | off_t offset = 0; | |
212 | ||
213 | // Start writing at the beginning of the file | |
214 | r = fseek(f, 0, SEEK_SET); | |
215 | if (r) | |
216 | return r; | |
217 | ||
218 | // Write the magic | |
219 | offset += fwrite(&magic, 1, sizeof(magic), f); | |
220 | ||
221 | // Skip the space we need to write the header later | |
222 | r = fseek(f, sizeof(header), SEEK_CUR); | |
223 | if (r) { | |
224 | DEBUG(writer->ctx, "Could not seek to position after header\n"); | |
225 | return r; | |
226 | } | |
227 | offset += sizeof(header); | |
228 | ||
229 | align_page_boundary(&offset, f); | |
230 | ||
231 | // Write all ASes | |
232 | r = loc_database_write_as_section(writer, &header, &offset, f); | |
233 | if (r) | |
234 | return r; | |
235 | ||
236 | align_page_boundary(&offset, f); | |
237 | ||
238 | // Write pool | |
239 | r = loc_database_write_pool(writer, &header, &offset, f); | |
240 | if (r) | |
241 | return r; | |
242 | ||
243 | // Write the header | |
244 | r = fseek(f, sizeof(magic), SEEK_SET); | |
245 | if (r) | |
246 | return r; | |
247 | ||
248 | offset += fwrite(&header, 1, sizeof(header), f); | |
249 | ||
250 | return 0; | |
251 | } |