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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> | |
3b5f4af2 | 25 | #include <loc/network.h> |
c182393f MT |
26 | #include <loc/writer.h> |
27 | ||
28 | #include "libloc-private.h" | |
29 | #include "as.h" | |
30 | ||
31 | struct loc_writer { | |
32 | struct loc_ctx* ctx; | |
33 | int refcount; | |
34 | ||
35 | struct loc_stringpool* pool; | |
36 | off_t vendor; | |
37 | off_t description; | |
38 | ||
39 | struct loc_as** as; | |
40 | size_t as_count; | |
3b5f4af2 MT |
41 | |
42 | struct loc_network_tree* networks; | |
c182393f MT |
43 | }; |
44 | ||
45 | LOC_EXPORT int loc_writer_new(struct loc_ctx* ctx, struct loc_writer** writer) { | |
46 | struct loc_writer* w = calloc(1, sizeof(*w)); | |
47 | if (!w) | |
48 | return -ENOMEM; | |
49 | ||
50 | w->ctx = loc_ref(ctx); | |
51 | w->refcount = 1; | |
52 | ||
0e974d4b | 53 | int r = loc_stringpool_new(ctx, &w->pool); |
c182393f MT |
54 | if (r) { |
55 | loc_writer_unref(w); | |
56 | return r; | |
57 | } | |
58 | ||
3b5f4af2 MT |
59 | // Initialize the network tree |
60 | r = loc_network_tree_new(ctx, &w->networks); | |
61 | if (r) { | |
62 | loc_writer_unref(w); | |
63 | return r; | |
64 | } | |
65 | ||
c182393f MT |
66 | *writer = w; |
67 | return 0; | |
68 | } | |
69 | ||
70 | LOC_EXPORT struct loc_writer* loc_writer_ref(struct loc_writer* writer) { | |
71 | writer->refcount++; | |
72 | ||
73 | return writer; | |
74 | } | |
75 | ||
76 | static void loc_writer_free(struct loc_writer* writer) { | |
77 | DEBUG(writer->ctx, "Releasing writer at %p\n", writer); | |
78 | ||
79 | // Unref all AS | |
80 | for (unsigned int i = 0; i < writer->as_count; i++) { | |
81 | loc_as_unref(writer->as[i]); | |
82 | } | |
83 | ||
3b5f4af2 MT |
84 | // Release network tree |
85 | if (writer->networks) | |
86 | loc_network_tree_unref(writer->networks); | |
87 | ||
c182393f MT |
88 | // Unref the string pool |
89 | loc_stringpool_unref(writer->pool); | |
90 | ||
91 | loc_unref(writer->ctx); | |
92 | free(writer); | |
93 | } | |
94 | ||
95 | LOC_EXPORT struct loc_writer* loc_writer_unref(struct loc_writer* writer) { | |
96 | if (--writer->refcount > 0) | |
97 | return writer; | |
98 | ||
99 | loc_writer_free(writer); | |
100 | ||
101 | return NULL; | |
102 | } | |
103 | ||
104 | LOC_EXPORT const char* loc_writer_get_vendor(struct loc_writer* writer) { | |
105 | return loc_stringpool_get(writer->pool, writer->vendor); | |
106 | } | |
107 | ||
108 | LOC_EXPORT int loc_writer_set_vendor(struct loc_writer* writer, const char* vendor) { | |
109 | // Add the string to the string pool | |
110 | off_t offset = loc_stringpool_add(writer->pool, vendor); | |
111 | if (offset < 0) | |
112 | return offset; | |
113 | ||
114 | writer->vendor = offset; | |
115 | return 0; | |
116 | } | |
117 | ||
118 | LOC_EXPORT const char* loc_writer_get_description(struct loc_writer* writer) { | |
119 | return loc_stringpool_get(writer->pool, writer->description); | |
120 | } | |
121 | ||
122 | LOC_EXPORT int loc_writer_set_description(struct loc_writer* writer, const char* description) { | |
123 | // Add the string to the string pool | |
124 | off_t offset = loc_stringpool_add(writer->pool, description); | |
125 | if (offset < 0) | |
126 | return offset; | |
127 | ||
128 | writer->description = offset; | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static int __loc_as_cmp(const void* as1, const void* as2) { | |
133 | return loc_as_cmp(*(struct loc_as**)as1, *(struct loc_as**)as2); | |
134 | } | |
135 | ||
136 | LOC_EXPORT int loc_writer_add_as(struct loc_writer* writer, struct loc_as** as, uint32_t number) { | |
137 | int r = loc_as_new(writer->ctx, writer->pool, as, number); | |
138 | if (r) | |
139 | return r; | |
140 | ||
141 | // We have a new AS to add | |
142 | writer->as_count++; | |
143 | ||
144 | // Make space | |
145 | writer->as = realloc(writer->as, sizeof(*writer->as) * writer->as_count); | |
146 | if (!writer->as) | |
147 | return -ENOMEM; | |
148 | ||
149 | // Add as last element | |
150 | writer->as[writer->as_count - 1] = loc_as_ref(*as); | |
151 | ||
152 | // Sort everything | |
153 | qsort(writer->as, writer->as_count, sizeof(*writer->as), __loc_as_cmp); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
3b5f4af2 MT |
158 | LOC_EXPORT int loc_writer_add_network(struct loc_writer* writer, struct loc_network** network, const char* string) { |
159 | int r; | |
160 | ||
161 | // Create a new network object | |
162 | r = loc_network_new_from_string(writer->ctx, network, string); | |
163 | if (r) | |
164 | return r; | |
165 | ||
166 | // Add it to the local tree | |
167 | return loc_network_tree_add_network(writer->networks, *network); | |
168 | } | |
169 | ||
c182393f MT |
170 | static void make_magic(struct loc_writer* writer, struct loc_database_magic* magic) { |
171 | // Copy magic bytes | |
172 | for (unsigned int i = 0; i < strlen(LOC_DATABASE_MAGIC); i++) | |
173 | magic->magic[i] = LOC_DATABASE_MAGIC[i]; | |
174 | ||
175 | // Set version | |
0676cd80 | 176 | magic->version = htobe16(LOC_DATABASE_VERSION); |
c182393f MT |
177 | } |
178 | ||
179 | static void align_page_boundary(off_t* offset, FILE* f) { | |
180 | // Move to next page boundary | |
181 | while (*offset % LOC_DATABASE_PAGE_SIZE > 0) | |
182 | *offset += fwrite("", 1, 1, f); | |
183 | } | |
184 | ||
185 | static int loc_database_write_pool(struct loc_writer* writer, | |
186 | struct loc_database_header_v0* header, off_t* offset, FILE* f) { | |
187 | // Save the offset of the pool section | |
188 | DEBUG(writer->ctx, "Pool starts at %jd bytes\n", *offset); | |
0676cd80 | 189 | header->pool_offset = htobe32(*offset); |
c182393f MT |
190 | |
191 | // Write the pool | |
192 | size_t pool_length = loc_stringpool_write(writer->pool, f); | |
193 | *offset += pool_length; | |
194 | ||
195 | DEBUG(writer->ctx, "Pool has a length of %zu bytes\n", pool_length); | |
0676cd80 | 196 | header->pool_length = htobe32(pool_length); |
c182393f MT |
197 | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static int loc_database_write_as_section(struct loc_writer* writer, | |
202 | struct loc_database_header_v0* header, off_t* offset, FILE* f) { | |
203 | DEBUG(writer->ctx, "AS section starts at %jd bytes\n", *offset); | |
0676cd80 | 204 | header->as_offset = htobe32(*offset); |
c182393f MT |
205 | |
206 | size_t as_length = 0; | |
207 | ||
208 | struct loc_database_as_v0 as; | |
209 | for (unsigned int i = 0; i < writer->as_count; i++) { | |
210 | // Convert AS into database format | |
211 | loc_as_to_database_v0(writer->as[i], &as); | |
212 | ||
213 | // Write to disk | |
214 | offset += fwrite(&as, 1, sizeof(as), f); | |
215 | as_length += sizeof(as); | |
216 | } | |
217 | ||
218 | DEBUG(writer->ctx, "AS section has a length of %zu bytes\n", as_length); | |
0676cd80 | 219 | header->as_length = htobe32(as_length); |
c182393f MT |
220 | |
221 | return 0; | |
222 | } | |
223 | ||
224 | LOC_EXPORT int loc_writer_write(struct loc_writer* writer, FILE* f) { | |
225 | struct loc_database_magic magic; | |
226 | make_magic(writer, &magic); | |
227 | ||
228 | // Make the header | |
229 | struct loc_database_header_v0 header; | |
0676cd80 MT |
230 | header.vendor = htobe32(writer->vendor); |
231 | header.description = htobe32(writer->description); | |
c182393f MT |
232 | |
233 | time_t now = time(NULL); | |
234 | header.created_at = htobe64(now); | |
235 | ||
236 | int r; | |
237 | off_t offset = 0; | |
238 | ||
239 | // Start writing at the beginning of the file | |
240 | r = fseek(f, 0, SEEK_SET); | |
241 | if (r) | |
242 | return r; | |
243 | ||
244 | // Write the magic | |
245 | offset += fwrite(&magic, 1, sizeof(magic), f); | |
246 | ||
247 | // Skip the space we need to write the header later | |
248 | r = fseek(f, sizeof(header), SEEK_CUR); | |
249 | if (r) { | |
250 | DEBUG(writer->ctx, "Could not seek to position after header\n"); | |
251 | return r; | |
252 | } | |
253 | offset += sizeof(header); | |
254 | ||
255 | align_page_boundary(&offset, f); | |
256 | ||
257 | // Write all ASes | |
258 | r = loc_database_write_as_section(writer, &header, &offset, f); | |
259 | if (r) | |
260 | return r; | |
261 | ||
262 | align_page_boundary(&offset, f); | |
263 | ||
264 | // Write pool | |
265 | r = loc_database_write_pool(writer, &header, &offset, f); | |
266 | if (r) | |
267 | return r; | |
268 | ||
269 | // Write the header | |
270 | r = fseek(f, sizeof(magic), SEEK_SET); | |
271 | if (r) | |
272 | return r; | |
273 | ||
274 | offset += fwrite(&header, 1, sizeof(header), f); | |
275 | ||
276 | return 0; | |
277 | } |