RIOT-OS/RIOT
RIOT-OS/RIOT
1
0
Fork 0
mirror of https://github.com/RIOT-OS/RIOT.git synced 2024-12-29 04:50:03 +01:00
Code Releases Activity

dns_msg: add debug output

Browse Source
This commit is contained in:
Benjamin Valentin 2024-09-09 13:09:47 +02:00
parent 74356c9737
commit 305b5db4eb
1 changed files with 11 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
sys/net/application_layer/dns/msg.c
View File

@ -26,6 +26,9 @@
#include "net/dns/msg.h"
#define ENABLE_DEBUG 0
#include "debug.h"
static ssize_t _enc_domain_name(uint8_t *out, const char *domain_name)
{
/*
@ -76,10 +79,13 @@ static ssize_t _skip_hostname(const uint8_t *buf, size_t len,
if (bufpos >= buflim) {
/* out-of-bound */
DEBUG("dns_msg: bufpos is out of bounds\n");
return -EBADMSG;
}
/* handle DNS Message Compression */
if (*bufpos >= 192) {
if (*bufpos & 0xc0) {
DEBUG("dns_msg: hostname is compressed\n");
if ((bufpos + 2) >= buflim) {
return -EBADMSG;
}
@ -90,6 +96,7 @@ static ssize_t _skip_hostname(const uint8_t *buf, size_t len,
res += bufpos[res] + 1;
if ((&bufpos[res]) >= buflim) {
/* out-of-bound */
DEBUG("dns_msg: hostname out-of-bounds\n");
return -EBADMSG;
}
}
@ -156,6 +163,7 @@ int dns_msg_parse_reply(const uint8_t *buf, size_t len, int family,
bufpos += tmp;
if ((bufpos + RR_TYPE_LENGTH + RR_CLASS_LENGTH +
RR_TTL_LENGTH + sizeof(uint16_t)) >= buflim) {
DEBUG("dns_msg: record beyond buf limit");
return -EBADMSG;
}
uint16_t _type = ntohs(_get_short(bufpos));
@ -173,6 +181,8 @@ int dns_msg_parse_reply(const uint8_t *buf, size_t len, int family,
return -EBADMSG;
}
DEBUG("dns_msg: type: %u, class: %u, len: %u\n", _type, class, addrlen);
/* skip unwanted answers */
if ((class != DNS_CLASS_IN) ||
((_type == DNS_TYPE_A) && (family == AF_INET6)) ||