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#include "first.h"
#include "sock_addr_cache.h"
#include "sys-socket.h"
#include <string.h>
#include "buffer.h"
#include "sock_addr.h"
int sock_addr_cache_inet_ntop_copy_buffer(buffer * const restrict b, const sock_addr * const restrict saddr)
{
#define NTOP_CACHE_MAX 4
static int ndx4;
static struct { struct in_addr ipv4; } ntop4_cache[NTOP_CACHE_MAX];
static struct { char s[INET_ADDRSTRLEN+1]; } ntop4_strs[NTOP_CACHE_MAX];
#ifdef HAVE_IPV6
static int ndx6;
static struct { struct in6_addr ipv6; } ntop6_cache[NTOP_CACHE_MAX];
static struct { char s[INET6_ADDRSTRLEN+1]; } ntop6_strs[NTOP_CACHE_MAX];
#endif
switch (saddr->plain.sa_family) {
case AF_INET:
for (int i = 0; i < NTOP_CACHE_MAX; ++i) {
if (ntop4_cache[i].ipv4.s_addr == saddr->ipv4.sin_addr.s_addr) {
buffer_copy_string(b, ntop4_strs[i].s);
return 0;
}
}
break;
#ifdef HAVE_IPV6
case AF_INET6:
for (int i = 0; i < NTOP_CACHE_MAX; ++i) {
if (0 == memcmp(ntop6_cache[i].ipv6.s6_addr,
saddr->ipv6.sin6_addr.s6_addr, 16)) {
buffer_copy_string(b, ntop6_strs[i].s);
return 0;
}
}
break;
#endif
default:
break;
}
if (0 != sock_addr_inet_ntop_copy_buffer(b, saddr)) {
buffer_blank(b);
return -1;
}
switch (saddr->plain.sa_family) {
case AF_INET:
ntop4_cache[ndx4].ipv4.s_addr = saddr->ipv4.sin_addr.s_addr;
memcpy(ntop4_strs+ndx4, b->ptr, buffer_clen(b)+1);
if (++ndx4 == NTOP_CACHE_MAX) ndx4 = 0;
break;
#ifdef HAVE_IPV6
case AF_INET6:
memcpy(ntop6_cache[ndx6].ipv6.s6_addr,saddr->ipv6.sin6_addr.s6_addr,16);
memcpy(ntop6_strs+ndx6, b->ptr, buffer_clen(b)+1);
if (++ndx6 == NTOP_CACHE_MAX) ndx6 = 0;
break;
#endif
default:
break;
}
return 0;
}
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