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#include <netinet/in.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <bits/sockaddr.h>
#include "mcast_sock.h"
struct mcast_server_sock *mcast_server_sock_setup(char* tx_mcast_group,
int tx_mcast_port,
int loopback)
{
struct mcast_server_sock *serv_sock = malloc(
sizeof(struct mcast_server_sock));
struct sockaddr_in *tx_mcast_sock_conf = malloc(
sizeof(struct sockaddr_in));
// setup mcast server socket
serv_sock->sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (serv_sock->sd == -1) {
perror("Failed to create Multicast Socket.\n");
return NULL;
}
memset(tx_mcast_sock_conf, 0, sizeof(*tx_mcast_sock_conf));
tx_mcast_sock_conf->sin_family = AF_INET;
tx_mcast_sock_conf->sin_addr.s_addr = inet_addr(tx_mcast_group);
tx_mcast_sock_conf->sin_port = htons(tx_mcast_port);
serv_sock->sock_conf = tx_mcast_sock_conf;
// disable loopback
if (loopback) {
char loop = 0;
if (setsockopt(serv_sock->sd, IPPROTO_IP,
IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0) {
perror("Failed to disable loopback.\n");
return NULL;
}
}
// // setup rx unix domain socket
// serv_sock->sd = socket(AF_LOCAL, SOCK_STREAM, IPPROTO_UDP);
// if (serv_sock->sd < 0) {
// perror("Failed to create Unix Domain Socket.\n");
// return NULL;
// }
// rx_sock_conf->sun_family = AF_LOCAL;
// strcpy(rx_sock_conf->sun_path, rx_unix_path);
// unlink(rx_sock_conf->sun_path);
//
// if (bind(serv_sock->sd, (struct sockaddr *)&rx_sock_conf,
// sizeof(rx_sock_conf)) != 0) {
// perror("Failed to bind the unix domain socket. '%s'\n",
// rx_sock_conf->sun_path);
// return NULL;
// }
//
// if (listen(serv_sock->sd, 0) != 0) {
// perror("Failed to listen.\n");
// return NULL;
// }
return serv_sock;
}
struct mcast_client_sock *mcast_client_sock_setup(char* mcast_group,
int mcast_port)
{
struct mcast_client_sock *client_sock = malloc(
sizeof(struct mcast_client_sock));
struct sockaddr_in *rx_sock_conf = malloc(sizeof(struct sockaddr_in));
struct ip_mreq *group_conf = malloc(sizeof(struct ip_mreq));
int rc, opt = 1;
// setup mcast client socket
client_sock->sd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (client_sock->sd == -1) {
return NULL;
}
memset(rx_sock_conf, 0, sizeof(*rx_sock_conf));
rx_sock_conf->sin_family = AF_INET;
// INADDR_ANY -> don't specify an interface, let OS choose the proper one
rx_sock_conf->sin_addr.s_addr = htonl(INADDR_ANY);
rx_sock_conf->sin_port = htons(mcast_port);
client_sock->sock_conf = rx_sock_conf;
/* let multiple processes use the same port */
rc = setsockopt(client_sock->sd,
SOL_SOCKET,
SO_REUSEADDR, &opt, sizeof(opt));
if (rc < 0) {
return NULL;
}
rc = bind(client_sock->sd, (struct sockaddr *)client_sock->sock_conf,
sizeof(*client_sock->sock_conf));
if (rc < 0) {
return NULL;
}
/* configure broadcast on this machine */
opt = 1;
rc = setsockopt(client_sock->sd,
IPPROTO_IP,
IP_MULTICAST_LOOP, &opt, sizeof(opt));
if (rc < 0) {
return NULL;
}
/* configure the broadcast group */
group_conf->imr_multiaddr.s_addr = inet_addr(mcast_group);
group_conf->imr_interface.s_addr = htonl(INADDR_ANY);
if (group_conf->imr_multiaddr.s_addr == -1) {
return NULL;
}
client_sock->mcast_group = group_conf;
/* join the broadcast group */
rc = setsockopt(client_sock->sd,
IPPROTO_IP,
IP_ADD_MEMBERSHIP, client_sock->mcast_group,
sizeof(*client_sock->mcast_group));
if (rc < 0) {
return NULL;
}
// // setup tx unix domain socket
// client_sock->tx_sd = socket(AF_LOCAL, SOCK_STREAM, IPPROTO_UDP);
// if (client_sock->tx_sd < 0) {
// perror("Failed to create Unix Domain Socket.\n");
// return NULL;
// }
// tx_sock_conf.sun_family = AF_LOCAL;
// strcpy(tx_sock_conf.sun_path, tx_unix_path);
// unlink(tx_sock_conf.sun_path);
//
// if (bind(client_sock->tx_sd, (struct sockaddr *)&tx_sock_conf,
// sizeof(tx_sock_conf)) != 0) {
// perror("Failed to bind the unix domain socket. '%s'\n",
// tx_sock_conf.sun_path);
// return NULL;
// }
//
// if ((client_sock->tx_sd, (struct sockaddr *)&tx_sock_conf, sizeof(tx_sock_conf))
// != 0) {
// perror("Failed to listen.\n");
// return NULL;
// }
return client_sock;
}
struct mcast_bidir_sock *mcast_bidir_sock_setup(char* tx_mcast_group,
int tx_mcast_port,
char* rx_mcast_group,
int rx_mcast_port)
{
struct mcast_bidir_sock *bidir_sock = malloc(
sizeof(struct mcast_bidir_sock));
bidir_sock->rx_sock = mcast_client_sock_setup(rx_mcast_group,
rx_mcast_port);
bidir_sock->tx_sock = mcast_server_sock_setup(tx_mcast_group,
tx_mcast_port, 0);
if (!bidir_sock->rx_sock || !bidir_sock->tx_sock) {
return NULL;
}
return bidir_sock;
}
int mcast_client_sock_rx(struct mcast_client_sock *client_sock, void* buf,
int buf_len)
{
return recv(client_sock->sd, buf, buf_len, 0);
}
int mcast_server_sock_tx(struct mcast_server_sock *serv_sock, void* data,
int data_len)
{
return sendto(serv_sock->sd, data, data_len, 0,
(struct sockaddr *)serv_sock->sock_conf,
sizeof(*serv_sock->sock_conf));
}
int mcast_bidir_sock_tx(struct mcast_bidir_sock *bidir_sock, void* data,
int data_len)
{
return mcast_server_sock_tx(bidir_sock->tx_sock, data, data_len);
}
int mcast_bidir_sock_rx(struct mcast_bidir_sock *bidir_sock, void* buf,
int buf_len)
{
return mcast_client_sock_rx(bidir_sock->rx_sock, buf, buf_len);
}
int mcast_client_sock_close(struct mcast_client_sock *client_sock)
{
free(client_sock->mcast_group);
free(client_sock->sock_conf);
free(client_sock);
return setsockopt(client_sock->sd,
IPPROTO_IP,
IP_DROP_MEMBERSHIP, client_sock->mcast_group,
sizeof(*client_sock->mcast_group))
+ close(client_sock->sd);
}
int mcast_server_sock_close(struct mcast_server_sock *serv_sock)
{
free(serv_sock->sock_conf);
free(serv_sock);
return close(serv_sock->sd) + close(serv_sock->sd);
}
int mcast_bidir_sock_close(struct mcast_bidir_sock *bidir_sock)
{
free(bidir_sock);
return mcast_client_sock_close(bidir_sock->rx_sock)
+ mcast_server_sock_close(bidir_sock->tx_sock);
}
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