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udp.c
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udp.c
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/*
* UDP functions
* Copyright (C) 2011 Unix Solutions Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License (COPYING file) for more details.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include "util.h"
#include "udp.h"
#ifndef IPV6_ADD_MEMBERSHIP
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
#endif
static int is_multicast(struct sockaddr_storage *addr) {
int ret = 0;
switch (addr->ss_family) {
case AF_INET: {
struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
ret = IN_MULTICAST(ntohl(addr4->sin_addr.s_addr));
break;
}
case AF_INET6: {
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
ret = IN6_IS_ADDR_MULTICAST(&addr6->sin6_addr);
break;
} }
return ret;
}
extern int ai_family;
static int get_socket(const char *hostname, const char *service, int socktype, struct sockaddr_storage *addr, int *addrlen, int *sock, bool is_output) {
struct addrinfo hints, *res, *ressave;
int n, ret = -1;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = ai_family;
hints.ai_socktype = socktype;
n = getaddrinfo(hostname, service, &hints, &res);
if (n < 0) {
ts_LOGf("ERROR: getaddrinfo(%s): %s\n", hostname, gai_strerror(n));
return ret;
}
ressave = res;
while (res) {
*sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (*sock > -1) {
int on = 1;
setsockopt(*sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
set_sock_nonblock(*sock);
if (is_output) {
memcpy(addr, res->ai_addr, res->ai_addrlen);
*addrlen = res->ai_addrlen;
ret = 0;
break;
}
if (bind(*sock, res->ai_addr, res->ai_addrlen) == 0) {
memcpy(addr, res->ai_addr, res->ai_addrlen);
*addrlen = res->ai_addrlen;
ret = 0;
break;
} else {
char str_addr[INET6_ADDRSTRLEN];
my_inet_ntop(res->ai_family, res->ai_addr, str_addr, sizeof(str_addr));
ts_LOGf("ERROR: bind: %s:%s (%s): %s\n",
hostname, service, str_addr, strerror(errno));
}
close(*sock);
*sock = -1;
}
res = res->ai_next;
}
freeaddrinfo(ressave);
return ret;
}
static int get_input_socket(const char *hostname, const char *service, int socktype, struct sockaddr_storage *addr, int *addrlen, int *sock) {
return get_socket(hostname, service, socktype, addr, addrlen, sock, false);
}
static int get_output_socket(const char *hostname, const char *service, int socktype, struct sockaddr_storage *addr, int *addrlen, int *sock) {
return get_socket(hostname, service, socktype, addr, addrlen, sock, true);
}
static int join_multicast_group(int sock, int ttl, struct sockaddr_storage *addr) {
switch (addr->ss_family) {
case AF_INET: {
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
mreq.imr_interface.s_addr = INADDR_ANY;
if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
ts_LOGf("ERROR: setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
return -1;
}
if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0) {
ts_LOGf("ERROR: setsockopt(IP_MULTICAST_TTL %d): %s\n", ttl, strerror(errno));
}
break;
}
case AF_INET6: {
struct ipv6_mreq mreq6;
memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
mreq6.ipv6mr_interface = 0; // interface index, will be set later
if (setsockopt(sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
ts_LOGf("ERROR: setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
return -1;
}
if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0) {
ts_LOGf("ERROR: setsockopt(IPV6_MULTICAST_HOPS %d): %s\n", ttl, strerror(errno));
}
break;
}
}
return 0;
}
int udp_connect_input(struct io *io) {
struct sockaddr_storage addr;
int addrlen = sizeof(addr);
int sock = -1;
memset(&addr, 0, sizeof(addr));
if (!io->isrc.s_addr)
ts_LOGf("Connecting input to %s port %s\n", io->hostname, io->service);
else
ts_LOGf("Connecting input to %s port %s source %s\n", io->hostname, io->service, inet_ntoa(io->isrc));
if (get_input_socket(io->hostname, io->service, SOCK_DGRAM, &addr, &addrlen, &sock) < 0)
return -1;
/* Set receive buffer size to ~2.0MB */
int bufsize = (2000000 / 1316) * 1316;
setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (void *)&bufsize, sizeof(bufsize));
if (is_multicast(&addr)) {
if (join_multicast_group(sock, io->ttl, &addr) < 0) {
close(sock);
return -1;
} else {
#ifdef IP_ADD_SOURCE_MEMBERSHIP
if (io->isrc.s_addr && addr.ss_family == AF_INET) {
/* Source-specific multicast */
struct sockaddr_in *src = (struct sockaddr_in *)&addr;
struct ip_mreq_source imr;
memset(&imr, 0, sizeof(imr));
imr.imr_multiaddr = src->sin_addr;
imr.imr_sourceaddr = io->isrc;
if (setsockopt(sock, IPPROTO_IP, IP_ADD_SOURCE_MEMBERSHIP,
(char *)&imr, sizeof(struct ip_mreq_source)) < 0)
{
char str_addr[INET6_ADDRSTRLEN];
my_inet_ntop(addr.ss_family, (struct sockaddr *)&addr, str_addr, sizeof(str_addr));
ts_LOGf("ERROR: Can't set multicast group %s source %s: %s\n",
str_addr, inet_ntoa(io->isrc), strerror(errno));
}
}
#endif
}
}
io->fd = sock;
ts_LOGf("Input connected to fd:%d\n", io->fd);
return 1;
}
int udp_connect_output(struct io *io) {
struct sockaddr_storage addr;
int addrlen = sizeof(addr);
int sock = -1;
memset(&addr, 0, sizeof(addr));
ts_LOGf("Connecting output to %s port %s ttl %d\n",
io->hostname, io->service, io->ttl);
if (get_output_socket(io->hostname, io->service, SOCK_DGRAM, &addr, &addrlen, &sock) < 0)
return -1;
/* Set send buffer size to ~2.0MB */
int bufsize = (2000000 / 1316) * 1316;
setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (void *)&bufsize, sizeof(bufsize));
if (is_multicast(&addr)) {
if (join_multicast_group(sock, io->ttl, &addr) < 0) {
close(sock);
return -1;
} else {
if (addr.ss_family == AF_INET) {
if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF, &io->intf, sizeof(io->intf)) < 0) {
ts_LOGf("ERROR: setsockopt(IP_MUTICAST_IF %s): %s\n", inet_ntoa(io->intf), strerror(errno));
close(sock);
return -1;
}
}
if (addr.ss_family == AF_INET6 && io->v6_if_index > -1) {
if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_IF, (void *)&io->v6_if_index, sizeof(io->v6_if_index)) < 0) {
ts_LOGf("ERROR: setsockopt(IPV6_MUTICAST_IF %d): %s\n", io->v6_if_index, strerror(errno));
close(sock);
return -1;
}
}
}
}
if (addr.ss_family == AF_INET && io->tos > -1) {
if (setsockopt(sock, IPPROTO_IP, IP_TOS, &io->tos, sizeof(io->tos)) < 0) {
ts_LOGf("ERROR: setsockopt(IP_TOS 0x%02x): %s\n", io->tos, strerror(errno));
}
}
if (connect(sock, (struct sockaddr *)&addr, addrlen) < 0) {
ts_LOGf("ERROR: udp_connect(): %s\n", strerror(errno));
close(sock);
return -1;
}
io->fd = sock;
ts_LOGf("Output connected to fd:%d\n", io->fd);
return 1;
}