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lighttpd1.4/src/inet_ntop_cache.c

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#include "first.h"
#include "inet_ntop_cache.h"
#include "base.h"
#include "log.h"
#include "sys-socket.h"
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#ifndef _WIN32
#include <netdb.h>
#endif
unsigned short sock_addr_get_port (const sock_addr *addr)
{
switch (addr->plain.sa_family) {
case AF_INET:
return ntohs(addr->ipv4.sin_port);
#ifdef HAVE_IPV6
case AF_INET6:
return ntohs(addr->ipv6.sin6_port);
#endif
default: /* case AF_UNIX: */
return 0;
}
}
int sock_addr_inet_pton(sock_addr *addr, const char *str,
int family, unsigned short port)
{
if (AF_INET == family) {
memset(&addr->ipv4, 0, sizeof(struct sockaddr_in));
addr->ipv4.sin_family = AF_INET;
addr->ipv4.sin_port = htons(port);
#if defined(HAVE_INET_ATON) /*(Windows does not provide inet_aton())*/
return (0 != inet_aton(str, &addr->ipv4.sin_addr));
#else
return ((addr->ipv4.sin_addr.s_addr = inet_addr(str)) != INADDR_NONE);
#endif
}
#ifdef HAVE_IPV6
else if (AF_INET6 == family) {
memset(&addr->ipv6, 0, sizeof(struct sockaddr_in6));
addr->ipv6.sin6_family = AF_INET6;
addr->ipv6.sin6_port = htons(port);
return inet_pton(AF_INET6, str, &addr->ipv6.sin6_addr);
}
#endif
else {
errno = EAFNOSUPPORT;
return -1;
}
}
const char * sock_addr_inet_ntop(const sock_addr *addr, char *buf, socklen_t sz)
{
if (addr->plain.sa_family == AF_INET) {
#if defined(HAVE_INET_PTON) /*(expect inet_ntop if inet_pton)*/
return inet_ntop(AF_INET,(const void *)&addr->ipv4.sin_addr,buf,sz);
#else /*(inet_ntoa() not thread-safe)*/
return inet_ntoa(addr->ipv4.sin_addr);
#endif
}
#ifdef HAVE_IPV6
else if (addr->plain.sa_family == AF_INET6) {
return inet_ntop(AF_INET6,(const void *)&addr->ipv6.sin6_addr,buf,sz);
}
#endif
#ifdef HAVE_SYS_UN_H
else if (addr->plain.sa_family == AF_UNIX) {
return addr->un.sun_path;
}
#endif
else {
errno = EAFNOSUPPORT;
return NULL;
}
}
int sock_addr_inet_ntop_copy_buffer(buffer *b, const sock_addr *addr)
{
/*(incur cost of extra copy to avoid potential extra memory allocation)*/
char buf[UNIX_PATH_MAX];
const char *s = sock_addr_inet_ntop(addr, buf, sizeof(buf));
if (NULL == s) return -1; /*(buffer not modified if any error occurs)*/
buffer_copy_string(b, s);
return 0;
}
int sock_addr_inet_ntop_append_buffer(buffer *b, const sock_addr *addr)
{
/*(incur cost of extra copy to avoid potential extra memory allocation)*/
char buf[UNIX_PATH_MAX];
const char *s = sock_addr_inet_ntop(addr, buf, sizeof(buf));
if (NULL == s) return -1; /*(buffer not modified if any error occurs)*/
buffer_append_string(b, s);
return 0;
}
int sock_addr_from_str_hints(server *srv, sock_addr *addr, socklen_t *len, const char *str, int family, unsigned short port)
{
/*(note: name resolution here is *blocking*)*/
switch(family) {
#ifdef HAVE_IPV6
case AF_INET6:
memset(addr, 0, sizeof(struct sockaddr_in6));
addr->ipv6.sin6_family = AF_INET6;
if (0 == strcmp(str, "::")) {
addr->ipv6.sin6_addr = in6addr_any;
}
else if (0 == strcmp(str, "::1")) {
addr->ipv6.sin6_addr = in6addr_loopback;
}
else {
struct addrinfo hints, *res;
int r;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (0 != (r = getaddrinfo(str, NULL, &hints, &res))) {
hints.ai_family = AF_INET;
if (
#ifdef EAI_ADDRFAMILY
EAI_ADDRFAMILY == r &&
#endif
0 == getaddrinfo(str, NULL, &hints, &res)) {
memcpy(addr, res->ai_addr, res->ai_addrlen);
addr->ipv4.sin_family = AF_INET;
addr->ipv4.sin_port = htons(port);
*len = sizeof(struct sockaddr_in);
/*assert(*len == res->ai_addrlen);*/
freeaddrinfo(res);
return 1;
}
log_error_write(srv, __FILE__, __LINE__,
"sssss", "getaddrinfo failed: ",
gai_strerror(r), "'", str, "'");
return 0;
}
memcpy(addr, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
}
addr->ipv6.sin6_port = htons(port);
*len = sizeof(struct sockaddr_in6);
return 1;
#endif
case AF_INET:
memset(addr, 0, sizeof(struct sockaddr_in));
addr->ipv4.sin_family = AF_INET;
if (0 == strcmp(str, "0.0.0.0")) {
addr->ipv4.sin_addr.s_addr = htonl(INADDR_ANY);
}
else if (0 == strcmp(str, "127.0.0.1")) {
addr->ipv4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
}
else {
#ifdef HAVE_INET_PTON
/*(reuse HAVE_INET_PTON for presence of getaddrinfo())*/
struct addrinfo hints, *res;
int r;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (0 != (r = getaddrinfo(str, NULL, &hints, &res))) {
log_error_write(srv, __FILE__, __LINE__,
"sssss", "getaddrinfo failed: ",
gai_strerror(r), "'", str, "'");
return 0;
}
memcpy(addr, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
#else
struct hostent *he = gethostbyname(str);
if (NULL == he) {
log_error_write(srv, __FILE__, __LINE__, "sds",
"gethostbyname failed:", h_errno, str);
return 0;
}
if (he->h_addrtype != AF_INET) {
log_error_write(srv, __FILE__, __LINE__, "sd",
"addr-type != AF_INET:", he->h_addrtype);
return 0;
}
if (he->h_length != sizeof(struct in_addr)) {
log_error_write(srv, __FILE__, __LINE__, "sd",
"addr-length != sizeof(in_addr):",he->h_length);
return 0;
}
memcpy(&addr->ipv4.sin_addr.s_addr,he->h_addr_list[0],he->h_length);
#endif
}
addr->ipv4.sin_port = htons(port);
*len = sizeof(struct sockaddr_in);
return 1;
#ifdef HAVE_SYS_UN_H
case AF_UNIX:
memset(addr, 0, sizeof(struct sockaddr_un));
addr->un.sun_family = AF_UNIX;
{
size_t hostlen = strlen(str) + 1;
if (hostlen > sizeof(addr->un.sun_path)) {
log_error_write(srv, __FILE__, __LINE__, "sS",
"unix socket filename too long:", str);
/*errno = ENAMETOOLONG;*/
return 0;
}
memcpy(addr->un.sun_path, str, hostlen);
#if defined(SUN_LEN)
*len = SUN_LEN(&addr->un);
#else
/* stevens says: */
*len = hostlen + sizeof(addr->un.sun_family);
#endif
}
return 1;
#else
case AF_UNIX:
log_error_write(srv, __FILE__, __LINE__, "s",
"unix domain sockets are not supported.");
return 0;
#endif
default:
log_error_write(srv, __FILE__, __LINE__, "sd",
"address family unsupported:", family);
/*errno = EAFNOSUPPORT;*/
return 0;
}
}
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);
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 =
inet_ntop(addr->plain.sa_family,
addr->plain.sa_family == AF_INET6 ?
(const void *) &(addr->ipv6.sin6_addr) :
(const void *) &(addr->ipv4.sin_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);
return inet_ntoa(addr->ipv4.sin_addr);
#endif
}