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#include <netinet/in.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/types.h>
#include "byte.h"
#include "ip.h"
#include "socket_if.h"
/**
@file socket_bind.c
@author djb, fefe, feh
@ref qmail, djbdns, ucspi-tcp6
@brief binding a socket to a local resource
*/
int socket_bind4(int s, const char ip[4], uint16 port)
{
struct sockaddr_in sa;
byte_zero(&sa, sizeof(sa));
sa.sin_family = AF_INET;
uint16_pack_big((char *)&sa.sin_port, port);
byte_copy((char *)&sa.sin_addr, 4, ip);
return bind(s, (struct sockaddr *)&sa, sizeof(sa));
}
int socket_bind4_reuse(int s, const char ip[4], uint16 port)
{
int opt = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
return socket_bind4(s, ip, port);
}
/* seems not to be used here -- djbdns requires it */
void socket_tryreservein(int s, int size)
{
while (size >= 1024) {
if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)) == 0) return;
size -= (size >> 5);
}
}
int socket_bind6(int s, const char ip[16], uint16 port, uint32 scope_id)
{
struct sockaddr_in6 sa;
byte_zero(&sa, sizeof(sa));
sa.sin6_family = AF_INET6;
uint16_pack_big((char *)&sa.sin6_port, port);
/* implicit: sa.sin6_flowinfo = 0; */
byte_copy((char *)&sa.sin6_addr, 16, ip);
sa.sin6_scope_id = scope_id;
return bind(s, (struct sockaddr *)&sa, sizeof(sa));
}
int socket_bind6_reuse(int s, const char ip[16], uint16 port, uint32 scope_id)
{
int opt = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
return socket_bind6(s, ip, port, scope_id);
}
int socket_bind(int s, const char ip[16], uint16 port, uint32 scope_id)
{
if (ip6_isv4mapped(ip)) return socket_bind4(s, ip + 12, port);
return socket_bind6(s, ip, port, scope_id);
}
int socket_bind_reuse(int s, const char ip[16], uint16 port, uint32 scope_id)
{
if (ip6_isv4mapped(ip)) return socket_bind4_reuse(s, ip + 12, port);
return socket_bind6_reuse(s, ip, port, scope_id);
}
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