lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include "inet_ntop_cache.h"
#include "sys-socket.h"
#include <sys/types.h>
#include <string.h>
#ifndef _WIN32
#include <arpa/inet.h>
#endif
#include "sock_addr.h"
const char * inet_ntop_cache_get_ip(server *srv, sock_addr *addr) {
#ifdef HAVE_IPV6
typedef struct {
int family;
union {
struct in6_addr ipv6;
struct in_addr ipv4;
} addr;
char b2[INET6_ADDRSTRLEN + 1];
} inet_ntop_cache_type;
#define INET_NTOP_CACHE_MAX 4
static inet_ntop_cache_type inet_ntop_cache[INET_NTOP_CACHE_MAX];
static int ndx;
int i;
UNUSED(srv);
#ifdef HAVE_SYS_UN_H
if (addr->plain.sa_family == AF_UNIX) return addr->un.sun_path;
#endif
for (i = 0; i < INET_NTOP_CACHE_MAX; i++) {
if (inet_ntop_cache[i].family == addr->plain.sa_family) {
if (inet_ntop_cache[i].family == AF_INET6 &&
0 == memcmp(inet_ntop_cache[i].addr.ipv6.s6_addr, addr->ipv6.sin6_addr.s6_addr, 16)) {
/* IPv6 found in cache */
break;
} else if (inet_ntop_cache[i].family == AF_INET &&
inet_ntop_cache[i].addr.ipv4.s_addr == addr->ipv4.sin_addr.s_addr) {
/* IPv4 found in cache */
break;
}
}
}
if (i == INET_NTOP_CACHE_MAX) {
/* not found in cache */
const char *s;
i = ndx;
if (++ndx >= INET_NTOP_CACHE_MAX) ndx = 0;
s = sock_addr_inet_ntop(addr, inet_ntop_cache[i].b2, INET6_ADDRSTRLEN);
if (NULL == s) return "";
inet_ntop_cache[i].family = addr->plain.sa_family;
if (inet_ntop_cache[i].family == AF_INET) {
inet_ntop_cache[i].addr.ipv4.s_addr = addr->ipv4.sin_addr.s_addr;
} else if (inet_ntop_cache[i].family == AF_INET6) {
memcpy(inet_ntop_cache[i].addr.ipv6.s6_addr, addr->ipv6.sin6_addr.s6_addr, 16);
}
}
return inet_ntop_cache[i].b2;
#else
UNUSED(srv);
if (addr->plain.sa_family == AF_INET) return inet_ntoa(addr->ipv4.sin_addr);
#ifdef HAVE_SYS_UN_H
if (addr->plain.sa_family == AF_UNIX) return addr->un.sun_path;
#endif
return "";
#endif
}