lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include "base.h"
#include "inet_ntop_cache.h"
#include "sys-socket.h"
#include <sys/types.h>
#include <string.h>
const char * inet_ntop_cache_get_ip(server *srv, sock_addr *addr) {
#ifdef HAVE_IPV6
size_t ndx = 0, i;
for (i = 0; i < INET_NTOP_CACHE_MAX; i++) {
if (srv->inet_ntop_cache[i].ts != 0 && srv->inet_ntop_cache[i].family == addr->plain.sa_family) {
if (srv->inet_ntop_cache[i].family == AF_INET6 &&
0 == memcmp(srv->inet_ntop_cache[i].addr.ipv6.s6_addr, addr->ipv6.sin6_addr.s6_addr, 16)) {
/* IPv6 found in cache */
break;
} else if (srv->inet_ntop_cache[i].family == AF_INET &&
srv->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 */
i = ndx;
inet_ntop(addr->plain.sa_family,
addr->plain.sa_family == AF_INET6 ?
(const void *) &(addr->ipv6.sin6_addr) :
(const void *) &(addr->ipv4.sin_addr),
srv->inet_ntop_cache[i].b2, INET6_ADDRSTRLEN);
srv->inet_ntop_cache[i].ts = srv->cur_ts;
srv->inet_ntop_cache[i].family = addr->plain.sa_family;
if (srv->inet_ntop_cache[i].family == AF_INET) {
srv->inet_ntop_cache[i].addr.ipv4.s_addr = addr->ipv4.sin_addr.s_addr;
} else if (srv->inet_ntop_cache[i].family == AF_INET6) {
memcpy(srv->inet_ntop_cache[i].addr.ipv6.s6_addr, addr->ipv6.sin6_addr.s6_addr, 16);
}
}
return srv->inet_ntop_cache[i].b2;
#else
UNUSED(srv);
return inet_ntoa(addr->ipv4.sin_addr);
#endif
}