Last change
on this file since 413 was 398, checked in by coas-nagasima, 5 years ago |
mbedTLS版Azure IoT Hub接続サンプルのソースコードを追加
|
-
Property svn:eol-style
set to
native
-
Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
|
File size:
988 bytes
|
Rev | Line | |
---|
[398] | 1 | #include <resolv.h>
|
---|
| 2 | #include <string.h>
|
---|
| 3 | #include <time.h>
|
---|
| 4 | #include "libc.h"
|
---|
| 5 |
|
---|
| 6 | int __res_mkquery(int op, const char *dname, int class, int type,
|
---|
| 7 | const unsigned char *data, int datalen,
|
---|
| 8 | const unsigned char *newrr, unsigned char *buf, int buflen)
|
---|
| 9 | {
|
---|
| 10 | int id, i, j;
|
---|
| 11 | unsigned char q[280];
|
---|
| 12 | struct timespec ts;
|
---|
| 13 | size_t l = strnlen(dname, 255);
|
---|
| 14 | int n;
|
---|
| 15 |
|
---|
| 16 | if (l && dname[l-1]=='.') l--;
|
---|
| 17 | n = 17+l+!!l;
|
---|
| 18 | if (l>253 || buflen<n || op>15u || class>255u || type>255u)
|
---|
| 19 | return -1;
|
---|
| 20 |
|
---|
| 21 | /* Construct query template - ID will be filled later */
|
---|
| 22 | memset(q, 0, n);
|
---|
| 23 | q[2] = op*8 + 1;
|
---|
| 24 | q[5] = 1;
|
---|
| 25 | memcpy((char *)q+13, dname, l);
|
---|
| 26 | for (i=13; q[i]; i=j+1) {
|
---|
| 27 | for (j=i; q[j] && q[j] != '.'; j++);
|
---|
| 28 | if (j-i-1u > 62u) return -1;
|
---|
| 29 | q[i-1] = j-i;
|
---|
| 30 | }
|
---|
| 31 | q[i+1] = type;
|
---|
| 32 | q[i+3] = class;
|
---|
| 33 |
|
---|
| 34 | /* Make a reasonably unpredictable id */
|
---|
| 35 | clock_gettime(CLOCK_REALTIME, &ts);
|
---|
| 36 | id = ts.tv_nsec + ts.tv_nsec/65536UL & 0xffff;
|
---|
| 37 | q[0] = id/256;
|
---|
| 38 | q[1] = id;
|
---|
| 39 |
|
---|
| 40 | memcpy(buf, q, n);
|
---|
| 41 | return n;
|
---|
| 42 | }
|
---|
| 43 |
|
---|
| 44 | weak_alias(__res_mkquery, res_mkquery);
|
---|
Note:
See
TracBrowser
for help on using the repository browser.