1 /*
2 * SysDB - src/utils/proto.c
3 * Copyright (C) 2013 Sebastian 'tokkee' Harl <sh@tokkee.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
28 #if HAVE_CONFIG_H
29 # include "config.h"
30 #endif
32 #include "core/data.h"
33 #include "core/store.h"
34 #include "core/time.h"
35 #include "utils/error.h"
36 #include "utils/proto.h"
38 #include <assert.h>
39 #include <errno.h>
41 #include <arpa/inet.h>
42 #include <limits.h>
44 #include <string.h>
45 #include <unistd.h>
47 #include <sys/select.h>
49 /*
50 * private helper functions
51 */
53 /* In case there's not enough buffer space, the marshal functions have to
54 * return the number of bytes that would have been written if enough space had
55 * been available. */
57 static ssize_t
58 marshal_int32(char *buf, size_t buf_len, uint32_t v)
59 {
60 if (buf_len >= sizeof(v)) {
61 v = htonl(v);
62 memcpy(buf, &v, sizeof(v));
63 }
64 return sizeof(v);
65 } /* marshal_int32 */
67 static ssize_t
68 marshal_int64(char *buf, size_t buf_len, int64_t v)
69 {
70 if (buf_len >= sizeof(v)) {
71 #if __BYTE_ORDER != __BIG_ENDIAN
72 v = (((int64_t)htonl((int32_t)v)) << 32)
73 + ((int64_t)htonl((int32_t)(v >> 32)));
74 #endif
75 memcpy(buf, &v, sizeof(v));
76 }
77 return sizeof(v);
78 } /* marshal_int64 */
80 static ssize_t
81 marshal_double(char *buf, size_t buf_len, double v)
82 {
83 uint64_t t = 0;
84 assert(sizeof(v) == sizeof(t));
85 memcpy(&t, &v, sizeof(v));
86 #if IEEE754_DOUBLE_BYTE_ORDER != IEEE754_DOUBLE_BIG_ENDIAN
87 t = (((int64_t)htonl((int32_t)t)) << 32)
88 + ((int64_t)htonl((int32_t)(t >> 32)));
89 #endif
90 if (buf_len >= sizeof(t))
91 memcpy(buf, &t, sizeof(t));
92 return sizeof(t);
93 } /* marshal_double */
95 static ssize_t
96 marshal_datetime(char *buf, size_t buf_len, sdb_time_t v)
97 {
98 return marshal_int64(buf, buf_len, (int64_t)v);
99 } /* marshal_datetime */
101 static ssize_t
102 marshal_binary(char *buf, size_t buf_len, size_t len, const unsigned char *v)
103 {
104 uint32_t tmp = htonl((uint32_t)len);
105 if (buf_len >= sizeof(tmp) + len) {
106 memcpy(buf, &tmp, sizeof(tmp));
107 memcpy(buf + sizeof(tmp), v, len);
108 }
109 return sizeof(tmp) + len;
110 } /* marshal_binary */
112 static ssize_t
113 marshal_string(char *buf, size_t buf_len, const char *v)
114 {
115 /* The actual string including the terminating null byte. */
116 size_t len = strlen(v) + 1;
117 if (buf_len >= len)
118 memcpy(buf, v, len);
119 return len;
120 } /* marshal_string */
122 #define OBJ_HEADER_LEN (sizeof(uint32_t) + sizeof(sdb_time_t))
123 static ssize_t
124 marshal_obj_header(char *buf, size_t buf_len,
125 int type, sdb_time_t last_update)
126 {
127 ssize_t n;
129 if (buf_len < OBJ_HEADER_LEN)
130 return OBJ_HEADER_LEN;
132 n = marshal_int32(buf, buf_len, (uint32_t)type);
133 buf += n; buf_len -= n;
134 marshal_datetime(buf, buf_len, last_update);
135 return OBJ_HEADER_LEN;
136 } /* marshal_obj_header */
138 /*
139 * public API
140 */
142 ssize_t
143 sdb_proto_marshal(char *buf, size_t buf_len, uint32_t code,
144 uint32_t msg_len, const char *msg)
145 {
146 size_t len = 2 * sizeof(uint32_t) + msg_len;
147 uint32_t tmp;
149 if (buf_len < 2 * sizeof(uint32_t))
150 return -1;
151 if (buf_len < len) /* crop message */
152 msg_len -= (uint32_t)(len - buf_len);
154 tmp = htonl(code);
155 memcpy(buf, &tmp, sizeof(tmp));
156 tmp = htonl(msg_len);
157 memcpy(buf + sizeof(tmp), &tmp, sizeof(tmp));
159 if (msg_len)
160 memcpy(buf + 2 * sizeof(tmp), msg, msg_len);
161 return len;
162 } /* sdb_proto_marshal */
164 ssize_t
165 sdb_proto_marshal_data(char *buf, size_t buf_len, const sdb_data_t *datum)
166 {
167 ssize_t len = 0, n = 0;
168 uint32_t tmp;
169 size_t i;
170 int type;
172 if (buf_len >= sizeof(tmp)) {
173 tmp = htonl((uint32_t)datum->type);
174 memcpy(buf, &tmp, sizeof(tmp));
175 buf += sizeof(tmp);
176 buf_len -= sizeof(tmp);
177 }
178 else
179 buf_len = 0;
180 len += sizeof(tmp);
182 if (datum->type == SDB_TYPE_NULL)
183 return len;
185 if (datum->type == SDB_TYPE_INTEGER)
186 n = marshal_int64(buf, buf_len, datum->data.integer);
187 else if (datum->type == SDB_TYPE_DECIMAL)
188 n = marshal_double(buf, buf_len, datum->data.decimal);
189 else if (datum->type == SDB_TYPE_STRING)
190 n = marshal_string(buf, buf_len, datum->data.string);
191 else if (datum->type == SDB_TYPE_DATETIME)
192 n = marshal_datetime(buf, buf_len, datum->data.datetime);
193 else if (datum->type == SDB_TYPE_BINARY)
194 n = marshal_binary(buf, buf_len,
195 datum->data.binary.length, datum->data.binary.datum);
196 else if (datum->type == SDB_TYPE_REGEX)
197 n = marshal_string(buf, buf_len, datum->data.re.raw);
199 if (n < 0)
200 return n;
201 else if (n > 0)
202 return len + n;
204 if (! (datum->type & SDB_TYPE_ARRAY)) {
205 errno = EINVAL;
206 return -1;
207 }
209 /* arrays */
210 if (buf_len >= sizeof(tmp)) {
211 tmp = htonl((uint32_t)datum->data.array.length);
212 memcpy(buf, &tmp, sizeof(tmp));
213 buf += sizeof(tmp);
214 buf_len -= sizeof(tmp);
215 }
216 else
217 buf_len = 0;
218 len += sizeof(tmp);
220 type = datum->type & 0xff;
221 for (i = 0; i < datum->data.array.length; ++i) {
222 if (type == SDB_TYPE_INTEGER) {
223 int64_t *v = datum->data.array.values;
224 n = marshal_int64(buf, buf_len, v[i]);
225 }
226 else if (type == SDB_TYPE_DECIMAL) {
227 double *v = datum->data.array.values;
228 n = marshal_double(buf, buf_len, v[i]);
229 }
230 else if (type == SDB_TYPE_STRING) {
231 char **v = datum->data.array.values;
232 n = marshal_string(buf, buf_len, v[i]);
233 }
234 else if (type == SDB_TYPE_DATETIME) {
235 sdb_time_t *v = datum->data.array.values;
236 n = marshal_datetime(buf, buf_len, v[i]);
237 }
238 else if (type == SDB_TYPE_BINARY) {
239 struct {
240 size_t length;
241 unsigned char *datum;
242 } *v = datum->data.array.values;
243 n = marshal_binary(buf, buf_len, v[i].length, v[i].datum);
244 }
245 else if (type == SDB_TYPE_REGEX) {
246 struct {
247 char *raw;
248 regex_t regex;
249 } *v = datum->data.array.values;
250 n = marshal_string(buf, buf_len, v[i].raw);
251 }
252 else {
253 errno = EINVAL;
254 return -1;
255 }
257 if (n < 0)
258 return -1;
259 if (buf_len >= (size_t)n) {
260 buf += n;
261 buf_len -= n;
262 }
263 else
264 buf_len = 0;
265 len += n;
266 }
267 return len;
268 } /* sdb_proto_marshal_data */
270 ssize_t
271 sdb_proto_marshal_host(char *buf, size_t buf_len,
272 const sdb_proto_host_t *host)
273 {
274 size_t len;
275 ssize_t n;
277 if ((! host) || (! host->name))
278 return -1;
280 len = OBJ_HEADER_LEN + strlen(host->name) + 1;
281 if (buf_len < len)
282 return len;
284 n = marshal_obj_header(buf, buf_len, SDB_HOST, host->last_update);
285 buf += n; buf_len -= n;
286 marshal_string(buf, buf_len, host->name);
287 return len;
288 } /* sdb_proto_marshal_host */
290 ssize_t
291 sdb_proto_marshal_service(char *buf, size_t buf_len,
292 const sdb_proto_service_t *svc)
293 {
294 size_t len;
295 ssize_t n;
297 if ((! svc) || (! svc->hostname) || (! svc->name))
298 return -1;
300 len = OBJ_HEADER_LEN + strlen(svc->hostname) + strlen(svc->name) + 2;
301 if (buf_len < len)
302 return len;
304 n = marshal_obj_header(buf, buf_len, SDB_SERVICE, svc->last_update);
305 buf += n; buf_len -= n;
306 n = marshal_string(buf, buf_len, svc->hostname);
307 buf += n; buf_len -= n;
308 marshal_string(buf, buf_len, svc->name);
309 return len;
310 } /* sdb_proto_marshal_service */
312 ssize_t
313 sdb_proto_marshal_metric(char *buf, size_t buf_len,
314 const sdb_proto_metric_t *metric)
315 {
316 size_t len;
317 ssize_t n;
319 if ((! metric) || (! metric->hostname) || (! metric->name))
320 return -1;
322 len = OBJ_HEADER_LEN + strlen(metric->hostname) + strlen(metric->name) + 2;
323 if (metric->store_type && metric->store_id)
324 len += strlen(metric->store_type) + strlen(metric->store_id) + 2;
325 if (buf_len < len)
326 return len;
328 n = marshal_obj_header(buf, buf_len, SDB_METRIC, metric->last_update);
329 buf += n; buf_len -= n;
330 n = marshal_string(buf, buf_len, metric->hostname);
331 buf += n; buf_len -= n;
332 n = marshal_string(buf, buf_len, metric->name);
333 buf += n; buf_len -= n;
334 if (metric->store_type && metric->store_id) {
335 n = marshal_string(buf, buf_len, metric->store_type);
336 buf += n; buf_len -= n;
337 marshal_string(buf, buf_len, metric->store_id);
338 }
339 return len;
340 } /* sdb_proto_marshal_metric */
342 ssize_t
343 sdb_proto_marshal_attribute(char *buf, size_t buf_len,
344 const sdb_proto_attribute_t *attr)
345 {
346 size_t len;
347 ssize_t n;
349 if ((! attr) || (! attr->parent) || (! attr->key) || (! attr->value)
350 || ((attr->parent_type != SDB_HOST) && (! attr->hostname))
351 || ((attr->parent_type != SDB_HOST)
352 && (attr->parent_type != SDB_SERVICE)
353 && (attr->parent_type != SDB_METRIC)))
354 return -1;
356 n = sdb_proto_marshal_data(NULL, 0, attr->value);
357 if (n < 0)
358 return -1;
360 len = OBJ_HEADER_LEN
361 + strlen(attr->parent) + strlen(attr->key) + 2 + (size_t)n;
362 if (attr->parent_type != SDB_HOST)
363 len += strlen(attr->hostname) + 1;
364 if (buf_len < len)
365 return len;
367 n = marshal_obj_header(buf, buf_len,
368 attr->parent_type | SDB_ATTRIBUTE, attr->last_update);
369 buf += n; buf_len -= n;
370 if (attr->parent_type != SDB_HOST) {
371 n = marshal_string(buf, buf_len, attr->hostname);
372 buf += n; buf_len -= n;
373 }
374 n = marshal_string(buf, buf_len, attr->parent);
375 buf += n; buf_len -= n;
376 n = marshal_string(buf, buf_len, attr->key);
377 buf += n; buf_len -= n;
378 sdb_proto_marshal_data(buf, buf_len, attr->value);
379 return len;
380 } /* sdb_proto_marshal_attribute */
382 ssize_t
383 sdb_proto_unmarshal_header(const char *buf, size_t buf_len,
384 uint32_t *code, uint32_t *msg_len)
385 {
386 uint32_t tmp;
387 ssize_t n;
389 if (buf_len < 2 * sizeof(uint32_t))
390 return -1;
392 n = sdb_proto_unmarshal_int32(buf, buf_len, &tmp);
393 if (code)
394 *code = tmp;
395 buf += n; buf_len -= n;
396 sdb_proto_unmarshal_int32(buf, buf_len, &tmp);
397 if (msg_len)
398 *msg_len = tmp;
399 return 2 * sizeof(uint32_t);
400 } /* sdb_proto_unmarshal_header */
402 ssize_t
403 sdb_proto_unmarshal_int32(const char *buf, size_t buf_len, uint32_t *v)
404 {
405 uint32_t n;
407 /* not enough data to read */
408 if (buf_len < sizeof(n))
409 return -1;
411 memcpy(&n, buf, sizeof(n));
412 if (v)
413 *v = ntohl(n);
414 return sizeof(n);
415 } /* sdb_proto_unmarshal_int32 */
417 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */