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//
// Copyright 2024 Staysail Systems, Inc. <info@staysail.tech>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#include "core/nng_impl.h"
#include "nng/nng.h"
#include <stdio.h>
#include <string.h>
static const char *
str_sa_inproc(const nng_sockaddr_inproc *sa, char *buf, size_t bufsz)
{
snprintf(buf, bufsz, "inproc[%s]", sa->sa_name);
return buf;
}
static const char *
str_sa_inet(const nng_sockaddr_in *sa, char *buf, size_t bufsz)
{
uint8_t *a_bytes = (uint8_t *) &sa->sa_addr;
uint8_t *p_bytes = (uint8_t *) &sa->sa_port;
snprintf(buf, bufsz, "%u.%u.%u.%u:%u", a_bytes[0], a_bytes[1],
a_bytes[2], a_bytes[3],
(((uint16_t) p_bytes[0]) << 8) + p_bytes[1]);
return (buf);
}
// emit an IPv6 address in "short form"
static char *
nni_inet_ntop(const uint8_t addr[16], char buf[46])
{
const uint8_t v4map[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
if (memcmp(addr, v4map, 12) == 0) {
snprintf(buf, 46, "::ffff:%u.%u.%u.%u", addr[12], addr[13],
addr[14], addr[15]);
return (buf);
}
uint8_t off = 0; // offset of first set of elided zeros
uint8_t cnt = 0; // how many elided zeros so far
uint8_t maxoff = 0; // offset of largest compressed region
uint8_t maxcnt = 0; // how many elided zeros at maxoff
// look for the largest compressible region
for (uint8_t i = 0; i < 16; i += 2) {
// is this word zero?
if ((addr[i] == 0) && (addr[i + 1] == 0)) {
cnt += 2;
// if this was the first zero word in region, record it
if (cnt == 2) {
off = i;
}
// possibly update the maximums
if (cnt > maxcnt) {
maxcnt = cnt;
maxoff = off;
}
} else {
cnt = 0;
}
}
if (maxcnt < 2) {
maxoff = 0xff; // too big for anything
}
int idx = 0;
bool sep = false;
buf[0] = 0;
for (uint8_t i = 0; i < 16; i += 2) {
// We have 46 bytes allocated, which is a "theoretical"
// maximum only. In practice the worst case is really
// 8 groups of four digits with 7 colons, so 39 bytes plus
// the null is 40 bytes. We only use the v4 mapped syntax
// when presented with ::ffff: - so 23 bytes for that syntax.
if (i == maxoff) {
NNI_ASSERT(idx <= 43);
strcat(buf + idx, "::");
idx += 2;
sep = false;
} else if (i < maxoff || i >= maxoff + maxcnt) {
// this takes at most six bytes -- four hex digits a
// colon, and a null
NNI_ASSERT(idx <= 40);
snprintf(buf + idx, 6, sep ? ":%x" : "%x",
(((uint16_t) addr[i]) << 8) + addr[i + 1]);
idx += strlen(buf + idx);
sep = true;
}
}
return (buf);
}
static const char *
str_sa_inet6(const nng_sockaddr_in6 *sa, char *buf, size_t bufsz)
{
const uint8_t *p_bytes = (uint8_t *) &sa->sa_port;
char istr[46];
if (sa->sa_scope) {
snprintf(buf, bufsz, "[%s%%%u]:%u",
nni_inet_ntop(sa->sa_addr, istr), sa->sa_scope,
(((uint16_t) (p_bytes[0])) << 8) + p_bytes[1]);
} else {
snprintf(buf, bufsz, "[%s]:%u",
nni_inet_ntop(sa->sa_addr, istr),
(((uint16_t) (p_bytes[0])) << 8) + p_bytes[1]);
}
return (buf);
}
static const char *
str_sa_ipc(const nng_sockaddr_ipc *sa, char *buf, size_t bufsz)
{
// does not deal well with embedded "{}" chars
snprintf(buf, bufsz, "%s", sa->sa_path);
return (buf);
}
static const char *
str_sa_abstract(const nng_sockaddr_abstract *sa, char *buf, size_t bufsz)
{
// does not deal well with embedded "{}" chars
snprintf(buf, bufsz, "abstract[%s]", sa->sa_name);
return (buf);
}
const char *
nng_str_sockaddr(const nng_sockaddr *sa, char *buf, size_t bufsz)
{
switch (sa->s_family) {
case NNG_AF_INPROC:
return (str_sa_inproc(&sa->s_inproc, buf, bufsz));
case NNG_AF_INET:
return (str_sa_inet(&sa->s_in, buf, bufsz));
case NNG_AF_INET6:
return (str_sa_inet6(&sa->s_in6, buf, bufsz));
case NNG_AF_IPC:
return (str_sa_ipc(&sa->s_ipc, buf, bufsz));
case NNG_AF_ABSTRACT:
return (str_sa_abstract(&sa->s_abstract, buf, bufsz));
case NNG_AF_UNSPEC:
default:
return ("unknown");
}
}
uint32_t
nng_sockaddr_port(const nng_sockaddr *sa)
{
uint16_t port16;
switch (sa->s_family) {
case NNG_AF_INET:
NNI_GET16(&sa->s_in.sa_port, port16);
return (port16);
case NNG_AF_INET6:
NNI_GET16(&sa->s_in6.sa_port, port16);
return (port16);
default:
return (0);
}
}
bool
nng_sockaddr_equal(const nng_sockaddr *sa1, const nng_sockaddr *sa2)
{
if (sa1->s_family != sa2->s_family) {
return false;
}
switch (sa1->s_family) {
case NNG_AF_INET:
return ((sa1->s_in.sa_addr == sa2->s_in.sa_addr) &&
(sa1->s_in.sa_port == sa2->s_in.sa_port));
case NNG_AF_INET6:
return (
memcmp(&sa1->s_in6, &sa2->s_in6, sizeof(sa1->s_in6)) == 0);
case NNG_AF_INPROC:
return (
strcmp(sa1->s_inproc.sa_name, sa2->s_inproc.sa_name) == 0);
case NNG_AF_IPC:
return (strcmp(sa1->s_ipc.sa_path, sa2->s_ipc.sa_path) == 0);
case NNG_AF_ABSTRACT:
return (strcmp((char *) sa1->s_abstract.sa_name,
(char *) sa2->s_abstract.sa_name) == 0);
default:
return (false);
}
}
// generate a quick non-zero 64-bit value for the sockaddr.
// This should usually be unique, but collisions are possible.
// The resulting hash is not portable and should not be used for
// anything except ephemeral uses (e.g. as an index into a id map.)
uint64_t
nng_sockaddr_hash(const nng_sockaddr *sa)
{
uint64_t val1, val2;
size_t len;
const uint8_t *ptr;
switch (sa->s_family) {
case NNG_AF_INET:
return (
((uint64_t) (sa->s_in.sa_addr) << 16) + sa->s_in.sa_port);
case NNG_AF_INET6:
memcpy(&val1, sa->s_in6.sa_addr, sizeof(val1));
memcpy(&val2, sa->s_in6.sa_addr + sizeof(val1), sizeof(val2));
// the high order bit is set to ensure it cannot be zero
return ((1ULL << 63) | (val1 ^ val2 ^ sa->s_in6.sa_port));
case NNG_AF_IPC:
len = strlen(sa->s_ipc.sa_path);
ptr = (const uint8_t *) sa->s_ipc.sa_path;
break;
case NNG_AF_INPROC:
len = strlen(sa->s_inproc.sa_name);
ptr = (const uint8_t *) sa->s_inproc.sa_name;
break;
case NNG_AF_ABSTRACT:
len = strlen((const char *) sa->s_abstract.sa_name);
ptr = (const uint8_t *) sa->s_abstract.sa_name;
break;
default:
// should never happen!
return (sa->s_family);
}
// sort of a string based hash done 64-bits at time.
val1 = 0;
while (len >= sizeof(val2)) {
memcpy(&val2, ptr, sizeof(val2));
val1 ^= val2;
len -= sizeof(val2);
ptr += sizeof(val2);
}
if (len > 0) {
val2 = 0;
memcpy(&val2, ptr, len);
val1 ^= val2;
}
return ((1ULL << 63) | val1);
}
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