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Handle EAI_AGAIN in gvm_host_reverse_lookup() IPv6 case. #229

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May 9, 2019
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Handle EAI_AGAIN in gvm_host_reverse_lookup() IPv6 case. #229

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59 changes: 28 additions & 31 deletions base/hosts.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1545,48 +1545,45 @@ gvm_hosts_exclude (gvm_hosts_t *hosts, const char *excluded_str)
char *
gvm_host_reverse_lookup (gvm_host_t *host)
{
if (host == NULL)
return NULL;
int retry = 2;
gchar hostname[NI_MAXHOST];
void *addr;
size_t addrlen;
struct sockaddr_in sa;
struct sockaddr_in6 sa6;

if (host->type == HOST_TYPE_NAME)
if (!host)
return NULL;
else if (host->type == HOST_TYPE_IPV4)
{
struct sockaddr_in sa;
int retry = 2;
gchar hostname[1000];

bzero (&sa, sizeof (struct sockaddr));
if (host->type == HOST_TYPE_IPV4)
{
addr = &sa;
addrlen = sizeof (sa);
memset (addr, '\0', addrlen);
sa.sin_addr = host->addr;
sa.sin_family = AF_INET;
while (retry--)
{
int ret = getnameinfo ((struct sockaddr *) &sa, sizeof (sa), hostname,
sizeof (hostname), NULL, 0, NI_NAMEREQD);
if (!ret)
return g_ascii_strdown (hostname, -1);
if (ret != EAI_AGAIN)
break;
}
return NULL;
}
else if (host->type == HOST_TYPE_IPV6)
{
struct sockaddr_in6 sa;
char hostname[1000];

bzero (&sa, sizeof (struct sockaddr));
memcpy (&sa.sin6_addr, &host->addr6, 16);
sa.sin6_family = AF_INET6;

if (getnameinfo ((struct sockaddr *) &sa, sizeof (sa), hostname,
sizeof (hostname), NULL, 0, NI_NAMEREQD))
return NULL;
else
return g_ascii_strdown (hostname, -1);
addr = &sa6;
addrlen = sizeof (sa6);
memset (&sa6, '\0', addrlen);
memcpy (&sa6.sin6_addr, &host->addr6, 16);
sa6.sin6_family = AF_INET6;
}
else
return NULL;

while (retry--)
{
int ret = getnameinfo (addr, addrlen, hostname, sizeof (hostname), NULL,
0, NI_NAMEREQD);
if (!ret)
return g_ascii_strdown (hostname, -1);
if (ret != EAI_AGAIN)
break;
}
return NULL;
}

/**
Expand Down