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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/03/17 15:39:02 UTC
[GitHub] [incubator-nuttx] xiaoxiang781216 commented on a change in pull request #5768: netdb/dns: do not insert the duplicate DNS address
xiaoxiang781216 commented on a change in pull request #5768:
URL: https://github.com/apache/incubator-nuttx/pull/5768#discussion_r829185991
##########
File path: libs/libc/netdb/lib_dnsaddserver.c
##########
@@ -257,15 +258,27 @@ int dns_add_nameserver(FAR const struct sockaddr *addr, socklen_t addrlen)
return -EINVAL;
}
- memcpy(&g_dns_servers[idx].addr, addr, copylen);
-
/* A port number of zero means to use the default DNS server port number */
if (*pport == 0)
{
*pport = HTONS(DNS_DEFAULT_PORT);
}
+ for (i = 0; i < g_dns_nservers; i++)
+ {
+ if (g_dns_servers[i].addr.sa_family == addr->sa_family)
+ {
+ if (memcmp(&g_dns_servers[i].addr, addr, copylen) == 0)
+ {
+ dns_semgive();
+ return OK;
+ }
+ }
+ }
+
+ memcpy(&g_dns_servers[idx].addr, addr, copylen);
Review comment:
need update CONFIG_NETDB_RESOLVCONF version at line 65 too
##########
File path: libs/libc/netdb/lib_dnsaddserver.c
##########
@@ -257,15 +258,27 @@ int dns_add_nameserver(FAR const struct sockaddr *addr, socklen_t addrlen)
return -EINVAL;
}
- memcpy(&g_dns_servers[idx].addr, addr, copylen);
-
/* A port number of zero means to use the default DNS server port number */
if (*pport == 0)
{
*pport = HTONS(DNS_DEFAULT_PORT);
}
+ for (i = 0; i < g_dns_nservers; i++)
Review comment:
let's call let's call dns_foreach_nameserver instead manual loop.
##########
File path: libs/libc/netdb/lib_dnsaddserver.c
##########
@@ -237,7 +238,7 @@ int dns_add_nameserver(FAR const struct sockaddr *addr, socklen_t addrlen)
/* Set up for the IPv6 address copy */
copylen = sizeof(struct sockaddr_in6);
- pport = &g_dns_servers[idx].ipv6.sin6_port;
+ pport = &((FAR struct sockaddr_in6 *)addr)->sin6_port;
Review comment:
it isn't good to change the const pointer
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