riot-ci/RIOT
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

dns_msg: make parsing input buffer const

Browse Source
This commit is contained in:
Martine Lenders 2021-08-11 11:43:06 +02:00
parent e8cbc6da85
commit 7920ab2b95
No known key found for this signature in database
GPG Key ID: 2134D77A5336DD80
2 changed files with 9 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
sys/include/net/dns/msg.h
View File

@ -109,7 +109,8 @@ size_t dns_msg_compose_query(void *dns_buf, const char *domain_name,
* @return -EBADMSG, when an address corresponding to @p family can not be found
* in @p buf.
*/
int dns_msg_parse_reply(uint8_t *buf, size_t len, int family, void *addr_out);
int dns_msg_parse_reply(const uint8_t *buf, size_t len, int family,
void *addr_out);
#ifdef __cplusplus
}

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

@ -61,14 +61,15 @@ static unsigned _put_short(uint8_t *out, uint16_t val)
return 2;
}
static unsigned _get_short(uint8_t *buf)
static unsigned _get_short(const uint8_t *buf)
{
uint16_t _tmp;
memcpy(&_tmp, buf, 2);
return _tmp;
}
static ssize_t _skip_hostname(const uint8_t *buf, size_t len, uint8_t *bufpos)
static ssize_t _skip_hostname(const uint8_t *buf, size_t len,
const uint8_t *bufpos)
{
const uint8_t *buflim = buf + len;
unsigned res = 0;
@ -129,11 +130,12 @@ size_t dns_msg_compose_query(void *dns_buf, const char *domain_name,
return bufpos - buf;
}
int dns_msg_parse_reply(uint8_t *buf, size_t len, int family, void *addr_out)
int dns_msg_parse_reply(const uint8_t *buf, size_t len, int family,
void *addr_out)
{
const uint8_t *buflim = buf + len;
dns_hdr_t *hdr = (dns_hdr_t *)buf;
uint8_t *bufpos = buf + sizeof(*hdr);
const dns_hdr_t *hdr = (dns_hdr_t *)buf;
const uint8_t *bufpos = buf + sizeof(*hdr);
/* skip all queries that are part of the reply */
for (unsigned n = 0; n < ntohs(hdr->qdcount); n++) {