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dns.c: Rename goto label memerr to ignore_packet

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Label is more descriptive this way
This commit is contained in:
Dirk Ziegelmeier 2017-11-13 22:37:38 +01:00
parent 1a1478551e
commit a56ea1b19f
1 changed files with 15 additions and 15 deletions
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30
src/core/dns.c
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@ -1161,7 +1161,7 @@ dns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr,
if (p->tot_len < (SIZEOF_DNS_HDR + SIZEOF_DNS_QUERY)) { if (p->tot_len < (SIZEOF_DNS_HDR + SIZEOF_DNS_QUERY)) {
LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too small\n")); LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too small\n"));
/* free pbuf and return */ /* free pbuf and return */
goto memerr; goto ignore_packet;
} }
/* copy dns payload inside static buffer for processing */ /* copy dns payload inside static buffer for processing */
@ -1181,11 +1181,11 @@ dns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr,
/* Check for correct response. */ /* Check for correct response. */
if ((hdr.flags1 & DNS_FLAG1_RESPONSE) == 0) { if ((hdr.flags1 & DNS_FLAG1_RESPONSE) == 0) {
LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": not a response\n", entry->name)); LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": not a response\n", entry->name));
goto memerr; /* ignore this packet */ goto ignore_packet; /* ignore this packet */
} }
if (nquestions != 1) { if (nquestions != 1) {
LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response not match to query\n", entry->name)); LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response not match to query\n", entry->name));
goto memerr; /* ignore this packet */ goto ignore_packet; /* ignore this packet */
} }
#if LWIP_DNS_SUPPORT_MDNS_QUERIES #if LWIP_DNS_SUPPORT_MDNS_QUERIES
@ -1195,7 +1195,7 @@ dns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr,
/* Check whether response comes from the same network address to which the /* Check whether response comes from the same network address to which the
question was sent. (RFC 5452) */ question was sent. (RFC 5452) */
if (!ip_addr_cmp(addr, &dns_servers[entry->server_idx])) { if (!ip_addr_cmp(addr, &dns_servers[entry->server_idx])) {
goto memerr; /* ignore this packet */ goto ignore_packet; /* ignore this packet */
} }
} }
@ -1204,22 +1204,22 @@ dns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr,
res_idx = dns_compare_name(entry->name, p, SIZEOF_DNS_HDR); res_idx = dns_compare_name(entry->name, p, SIZEOF_DNS_HDR);
if (res_idx == 0xFFFF) { if (res_idx == 0xFFFF) {
LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response not match to query\n", entry->name)); LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response not match to query\n", entry->name));
goto memerr; /* ignore this packet */ goto ignore_packet; /* ignore this packet */
} }
/* check if "question" part matches the request */ /* check if "question" part matches the request */
if (pbuf_copy_partial(p, &qry, SIZEOF_DNS_QUERY, res_idx) != SIZEOF_DNS_QUERY) { if (pbuf_copy_partial(p, &qry, SIZEOF_DNS_QUERY, res_idx) != SIZEOF_DNS_QUERY) {
goto memerr; /* ignore this packet */ goto ignore_packet; /* ignore this packet */
} }
if ((qry.cls != PP_HTONS(DNS_RRCLASS_IN)) || if ((qry.cls != PP_HTONS(DNS_RRCLASS_IN)) ||
(LWIP_DNS_ADDRTYPE_IS_IPV6(entry->reqaddrtype) && (qry.type != PP_HTONS(DNS_RRTYPE_AAAA))) || (LWIP_DNS_ADDRTYPE_IS_IPV6(entry->reqaddrtype) && (qry.type != PP_HTONS(DNS_RRTYPE_AAAA))) ||
(!LWIP_DNS_ADDRTYPE_IS_IPV6(entry->reqaddrtype) && (qry.type != PP_HTONS(DNS_RRTYPE_A)))) { (!LWIP_DNS_ADDRTYPE_IS_IPV6(entry->reqaddrtype) && (qry.type != PP_HTONS(DNS_RRTYPE_A)))) {
LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response not match to query\n", entry->name)); LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response not match to query\n", entry->name));
goto memerr; /* ignore this packet */ goto ignore_packet; /* ignore this packet */
} }
/* skip the rest of the "question" part */ /* skip the rest of the "question" part */
if (res_idx + SIZEOF_DNS_QUERY > 0xFFFF) { if (res_idx + SIZEOF_DNS_QUERY > 0xFFFF) {
goto memerr; goto ignore_packet;
} }
res_idx = (u16_t)(res_idx + SIZEOF_DNS_QUERY); res_idx = (u16_t)(res_idx + SIZEOF_DNS_QUERY);
@ -1231,15 +1231,15 @@ dns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr,
/* skip answer resource record's host name */ /* skip answer resource record's host name */
res_idx = dns_skip_name(p, res_idx); res_idx = dns_skip_name(p, res_idx);
if (res_idx == 0xFFFF) { if (res_idx == 0xFFFF) {
goto memerr; /* ignore this packet */ goto ignore_packet; /* ignore this packet */
} }
/* Check for IP address type and Internet class. Others are discarded. */ /* Check for IP address type and Internet class. Others are discarded. */
if (pbuf_copy_partial(p, &ans, SIZEOF_DNS_ANSWER, res_idx) != SIZEOF_DNS_ANSWER) { if (pbuf_copy_partial(p, &ans, SIZEOF_DNS_ANSWER, res_idx) != SIZEOF_DNS_ANSWER) {
goto memerr; /* ignore this packet */ goto ignore_packet; /* ignore this packet */
} }
if (res_idx + SIZEOF_DNS_ANSWER > 0xFFFF) { if (res_idx + SIZEOF_DNS_ANSWER > 0xFFFF) {
goto memerr; goto ignore_packet;
} }
res_idx = (u16_t)(res_idx + SIZEOF_DNS_ANSWER); res_idx = (u16_t)(res_idx + SIZEOF_DNS_ANSWER);
@ -1253,7 +1253,7 @@ dns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr,
ip4_addr_t ip4addr; ip4_addr_t ip4addr;
/* read the IP address after answer resource record's header */ /* read the IP address after answer resource record's header */
if (pbuf_copy_partial(p, &ip4addr, sizeof(ip4_addr_t), res_idx) != sizeof(ip4_addr_t)) { if (pbuf_copy_partial(p, &ip4addr, sizeof(ip4_addr_t), res_idx) != sizeof(ip4_addr_t)) {
goto memerr; /* ignore this packet */ goto ignore_packet; /* ignore this packet */
} }
ip_addr_copy_from_ip4(dns_table[i].ipaddr, ip4addr); ip_addr_copy_from_ip4(dns_table[i].ipaddr, ip4addr);
pbuf_free(p); pbuf_free(p);
@ -1272,7 +1272,7 @@ dns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr,
ip6_addr_p_t ip6addr; ip6_addr_p_t ip6addr;
/* read the IP address after answer resource record's header */ /* read the IP address after answer resource record's header */
if (pbuf_copy_partial(p, &ip6addr, sizeof(ip6_addr_p_t), res_idx) != sizeof(ip6_addr_p_t)) { if (pbuf_copy_partial(p, &ip6addr, sizeof(ip6_addr_p_t), res_idx) != sizeof(ip6_addr_p_t)) {
goto memerr; /* ignore this packet */ goto ignore_packet; /* ignore this packet */
} }
/* @todo: scope ip6addr? Might be required for link-local addresses at least? */ /* @todo: scope ip6addr? Might be required for link-local addresses at least? */
ip_addr_copy_from_ip6_packed(dns_table[i].ipaddr, ip6addr); ip_addr_copy_from_ip6_packed(dns_table[i].ipaddr, ip6addr);
@ -1286,7 +1286,7 @@ dns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr,
} }
/* skip this answer */ /* skip this answer */
if ((int)(res_idx + lwip_htons(ans.len)) > 0xFFFF) { if ((int)(res_idx + lwip_htons(ans.len)) > 0xFFFF) {
goto memerr; /* ignore this packet */ goto ignore_packet; /* ignore this packet */
} }
res_idx = (u16_t)(res_idx + lwip_htons(ans.len)); res_idx = (u16_t)(res_idx + lwip_htons(ans.len));
--nanswers; --nanswers;
@ -1318,7 +1318,7 @@ dns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr,
} }
} }
memerr: ignore_packet:
/* deallocate memory and return */ /* deallocate memory and return */
pbuf_free(p); pbuf_free(p);
return; return;