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// SPDX-License-Identifier: ISC
/*
* optimized ntop, about 10x faster than libc versions [as of 2019]
*
* Copyright (c) 2019 David Lamparter, for NetDEF, Inc.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "compiler.h"
#define pos (*posx)
static inline void putbyte(uint8_t bytex, char **posx)
__attribute__((always_inline)) OPTIMIZE;
static inline void putbyte(uint8_t bytex, char **posx)
{
bool zero = false;
int byte = bytex, tmp, a, b;
tmp = byte - 200;
if (tmp >= 0) {
*pos++ = '2';
zero = true;
byte = tmp;
} else {
tmp = byte - 100;
if (tmp >= 0) {
*pos++ = '1';
zero = true;
byte = tmp;
}
}
/* make sure the compiler knows the value range of "byte" */
assume(byte < 100 && byte >= 0);
b = byte % 10;
a = byte / 10;
if (a || zero) {
*pos++ = '0' + a;
*pos++ = '0' + b;
} else
*pos++ = '0' + b;
}
static inline void puthex(uint16_t word, char **posx)
__attribute__((always_inline)) OPTIMIZE;
static inline void puthex(uint16_t word, char **posx)
{
const char *digits = "0123456789abcdef";
if (word >= 0x1000)
*pos++ = digits[(word >> 12) & 0xf];
if (word >= 0x100)
*pos++ = digits[(word >> 8) & 0xf];
if (word >= 0x10)
*pos++ = digits[(word >> 4) & 0xf];
*pos++ = digits[word & 0xf];
}
#undef pos
const char *frr_inet_ntop(int af, const void * restrict src,
char * restrict dst, socklen_t size)
__attribute__((flatten)) OPTIMIZE;
const char *frr_inet_ntop(int af, const void * restrict src,
char * restrict dst, socklen_t size)
{
const uint8_t *b = src;
/* 8 * "abcd:" for IPv6
* note: the IPv4-embedded IPv6 syntax is only used for ::A.B.C.D,
* which isn't longer than 40 chars either. even with ::ffff:A.B.C.D
* it's shorter.
*/
char buf[8 * 5], *o = buf;
size_t best = 0, bestlen = 0, curlen = 0, i;
switch (af) {
case AF_INET:
inet4:
putbyte(b[0], &o);
*o++ = '.';
putbyte(b[1], &o);
*o++ = '.';
putbyte(b[2], &o);
*o++ = '.';
putbyte(b[3], &o);
*o++ = '\0';
break;
case AF_INET6:
for (i = 0; i < 8; i++) {
if (b[i * 2] || b[i * 2 + 1]) {
if (curlen && curlen > bestlen) {
best = i - curlen;
bestlen = curlen;
}
curlen = 0;
continue;
}
curlen++;
}
if (curlen && curlen > bestlen) {
best = i - curlen;
bestlen = curlen;
}
/* do we want ::ffff:A.B.C.D? */
if (best == 0 && bestlen == 6) {
*o++ = ':';
*o++ = ':';
b += 12;
goto inet4;
}
if (bestlen == 1)
bestlen = 0;
for (i = 0; i < 8; i++) {
if (bestlen && i == best) {
if (i == 0)
*o++ = ':';
*o++ = ':';
continue;
}
if (i > best && i < best + bestlen) {
continue;
}
puthex((b[i * 2] << 8) | b[i * 2 + 1], &o);
if (i < 7)
*o++ = ':';
}
*o++ = '\0';
break;
default:
return NULL;
}
i = o - buf;
if (i > size)
return NULL;
/* compiler might inline memcpy if it knows the length is short,
* although neither gcc nor clang actually do this currently [2019]
*/
assume(i <= 8 * 5);
memcpy(dst, buf, i);
return dst;
}
#if !defined(INET_NTOP_NO_OVERRIDE)
/* we want to override libc inet_ntop, but make sure it shows up in backtraces
* as frr_inet_ntop (to avoid confusion while debugging)
*/
const char *inet_ntop(int af, const void *src, char *dst, socklen_t size)
__attribute__((alias ("frr_inet_ntop")));
#endif
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