I am using a CFSocket configured for UDP to send data through wifi. The problem is that when I receive an empty UDP packet, the wifi suddenly stops working. I cant receive or send wnything anymore after that. Does anyone know what seems to be the problem? Here is my configuration and callback code:
void socketCallback(CFSocketRef cfSocket, CFSocketCallBackType type, CFDataRef address, const void *data, void *userInfo)
{
NSData * inputData = (__bridge NSData*)data;
NSUInteger inputDataCapacity = inputData.length * 2;
if(inputDataCapacity > minimalFrameSize*2){
//DO STH
}
}
-(void) initNetworkCommunication
{
CFSocketContext socketContext = {0, (__bridge void *)(self), NULL, NULL, NULL};
_cfSocket = CFSocketCreate(kCFAllocatorDefault, AF_INET, SOCK_DGRAM, IPPROTO_UDP, kCFSocketAcceptCallBack | kCFSocketDataCallBack, (CFSocketCallBack)socketCallback, &socketContext);
if ( _cfSocket == NULL) {
// NSLog(#"CfSocketCreate failed");
}
else {
if( _cfSocket ) {
_addrData = [Utils createIpAddressDataRef:COMM_INT_LISTENER_ADDR];
int flag = 1;
CFSocketNativeHandle socket_handle = (CFSocketNativeHandle)CFSocketGetNative(_cfSocket);
setsockopt(socket_handle, SOL_SOCKET, SO_BROADCAST, &flag, sizeof(flag));
//set address of the socket to listen to
CFSocketSetAddress (_cfSocket, _addrData);
_cfSource = CFSocketCreateRunLoopSource(kCFAllocatorDefault, _cfSocket, 0);
CFRunLoopAddSource(CFRunLoopGetCurrent(), _cfSource, kCFRunLoopDefaultMode);
CFRelease(_cfSource);
CFRelease(_cfSocket);
}
}
}
And sometimes after the wifi "crash" happens, I get an "EXC_BAD_ACCESS" when using CFSocketSendData.
Related
I am learning freertos and lwip on a Arty Z7.
I have managed to launch several tasks without problem but when I try to setup a lwip server to receive TCP packets, the server works perfectly but the other tasks won't continue their work.
So when I run the following code, the xil_printf of the "dumb_task" is writing correctly its message until the PHY autonegation is complete. Then, Nothing will happen from the dumb_task but the connection from the tcp port are accepted by the fpga. (I have commented by purpose the receive packet thread as it's changing nothing).
Do you have any ideas of what could be the problem?
Thank you!
Here is my code:
what is in my main file:
static sys_thread_t g_server_th_handle;
void dumb_task(void *p){
while(1){
xil_printf("dummy!\n");
vTaskDelay(10);
}
}
int main()
{
xTaskCreate (dumb_task, "TestTask", 512, NULL, 4, NULL);
g_server_th_handle = create_server_thread(2);
vTaskStartScheduler();
while(1);
return 0;
}
what is in a .cpp/.h file for the server:
static sys_thread_t g_server_thread_handle;
static int complete_nw_thread;
struct netif server_netif;
int g_server_tasks_priority = DEFAULT_THREAD_PRIO;
void setting_thread(void *p)
{
/* the mac address of the board. this should be unique per board */
u8_t mac_ethernet_address[] = { 0x00, 0x0a, 0x35, 0x00, 0x01, 0x02 };
/* Add network interface to the netif_list, and set it as default */
if (!xemac_add(&server_netif, NULL, NULL, NULL, mac_ethernet_address,
PLATFORM_EMAC_BASEADDR)) {
xil_printf("Error adding N/W interface\r\n");
return;
}
netif_set_default(&server_netif);
/* specify that the network if is up */
netif_set_up(&server_netif);
/* start packet receive thread - required for lwIP operation */
sys_thread_new("xemacif_input_thread",
(void(*)(void*))xemacif_input_thread, &server_netif,
THREAD_STACKSIZE, g_server_tasks_priority);
complete_nw_thread = 1;
vTaskResume(g_server_thread_handle);
vTaskDelete(NULL);
}
void accept_loop()
{
int sock, new_sd;
int opt=1;
struct sockaddr_in address, remote;
int size;
// set up address to connect to
memset(&address, 0, sizeof(address));
if ((sock = lwip_socket(AF_INET, SOCK_STREAM, 0)) < 0) {
xil_printf("TCP server: Error creating Socket\r\n");
return;
}
address.sin_family = AF_INET;
address.sin_port = htons(TCP_CONN_PORT);
address.sin_addr.s_addr = INADDR_ANY;
if (bind(sock, (struct sockaddr *)&address, sizeof (address)) < 0) {
xil_printf("TCP server: Unable to bind to port %d\r\n",
TCP_CONN_PORT);
close(sock);
return;
}
ioctl(sock,FIONBIO,&opt);
if (listen(sock, 0) < 0) {
xil_printf("TCP server: tcp_listen failed\r\n");
close(sock);
return;
}
size = sizeof(remote);
xil_printf("Server set and listening\n\r");
for(;;) {
if ((new_sd = accept(sock, (struct sockaddr *)&remote,
(socklen_t *)&size)) > 0){
char *ip = inet_ntoa(((struct sockaddr_in*) &remote)->sin_addr);
gTCP_connection_count +=1;
xil_printf("New connection from %s. Number of client : %d\n\r",
ip,gTCP_connection_count);
/*sys_thread_new("TCP_recv thread",
tcp_recv_traffic, (void*)&new_sd,
TCP_SERVER_THREAD_STACKSIZE,
g_server_tasks_priority);*/
}
vTaskDelay(pdMS_TO_TICKS( 1UL ));
}
}
void server_thread(void *p)
{
// /* initialize lwIP before calling sys_thread_new */
lwip_init();
/* any thread using lwIP should be created using sys_thread_new */
sys_thread_new("nw_thread", setting_thread, NULL,
THREAD_STACKSIZE, g_server_tasks_priority);
/* Suspend Task until auto-negotiation is completed */
if (!complete_nw_thread){
vTaskSuspend(NULL);
}
assign_default_ip(&(server_netif.ip_addr), &(server_netif.netmask),
&(server_netif.gw));
print_ip_settings(&(server_netif.ip_addr), &(server_netif.netmask),
&(server_netif.gw));
/* start the application*/
accept_loop();
vTaskDelete(NULL);
return;
}
sys_thread_t create_server_thread(int priority){
g_server_tasks_priority = priority;
g_server_thread_handle = sys_thread_new("server_thread", server_thread, 0,
THREAD_STACKSIZE, priority );
return g_server_thread_handle;
}
I'm trying to set up a UDP socket on iOS to listen for datagrams coming over a multicast socket:
#import <CoreFoundation/CoreFoundation.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
void getSocketDataCallBack (CFSocketRef cfSocketRef, CFSocketCallBackType cbType, CFDataRef address, const void *data, void *info) {
if (cbType == kCFSocketDataCallBack) {
cout << "o";
} else {
cout << "x";
}
}
void main () {
CFSocketError cfErr;
CFSocketContext udpSocketContext = {0, NULL, NULL, NULL, NULL};
udpSocketContext.info = &cbData;
CFSocketRef udpSocketRef = CFSocketCreate(kCFAllocatorDefault,
PF_INET,
SOCK_DGRAM,
IPPROTO_UDP,
kCFSocketDataCallBack,
&getSocketDataCallBack,
&udpSocketContext);
if ( udpSocketRef == NULL) {
cout << "CFSocketCreate failed\n";
} else {
cout << "UDP socket created\n";
CFRunLoopSourceRef source = CFSocketCreateRunLoopSource( kCFAllocatorDefault, udpSocketRef, 0 );
CFRunLoopAddSource( CFRunLoopGetMain(), source, kCFRunLoopCommonModes );
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_len = sizeof(addr);
addr.sin_family = AF_INET;
addr.sin_port = htons(MC_PORT); //4194
inet_aton(MC_ADDR, &addr.sin_addr); //239.0.123.45
//Tell socket to listen on this address
CFDataRef cfDataRef = CFDataCreate(NULL, (const UInt8 *)&addr, sizeof(addr));
cfErr = CFSocketSetAddress(udpSocketRef, cfDataRef);
}
}
All the socket calls succeed, but I don't get any callbacks (I am sending UDP datagrams to the MC address from a separate macOS application).
What am I doing wrong?
Thanks for any an all assistance!
Cheers.
The problem is that CFSocket does not in itself enable receipt of datagrams sent to an IPv4 (nor IPv6) multicast address. But all is not hopeless!
At https://justanapplication.wordpress.com/category/posix/posix-system-calls/posix-socket/ I found this: "Fortunately the function CFSocketCreateWithNative can turn a theoretical POSIX socket into a theoretical CFSocket." The author of this, Simon Lewis, also says that this actually works, too, "at least on an iPad running iOS 7.0.4," and he is nice enough to provide some code to try it out with. Good Luck!
I need to build an game use Socket to connect multi device.
I have a problem when i try to create socket on cocos2dx.
void AcceptCallBack(
CFSocketRef socket,
CFSocketCallBackType type,
CFDataRef address,
const void *data,
void *info)
{
CFReadStreamRef readStream = NULL;
CFWriteStreamRef writeStream = NULL;
CFIndex bytes;
UInt8 buffer[128];
UInt8 recv_len = 0, send_len = 0;
/* The native socket, used for various operations */
CFSocketNativeHandle sock = *(CFSocketNativeHandle *) data;
/* The punch line we stored in the socket context */
char *punchline = info;
/* Create the read and write streams for the socket */
CFStreamCreatePairWithSocket(kCFAllocatorDefault, sock,
&readStream, &writeStream);
if (!readStream || !writeStream) {
close(sock);
fprintf(stderr, "CFStreamCreatePairWithSocket() failed\n");
return;
}
CFReadStreamOpen(readStream);
CFWriteStreamOpen(writeStream);
/* Wait for the client to finish sending the joke; wait for newline */
memset(buffer, 0, sizeof(buffer));
while (!strchr((char *) buffer, '\n') && recv_len < sizeof(buffer)) {
bytes = CFReadStreamRead(readStream, buffer + recv_len,
sizeof(buffer) - recv_len);
if (bytes < 0) {
// fprintf(stderr, "CFReadStreamRead() failed: %d\n", bytes);
close(sock);
return;
}
// NSLog(#"Read: %d", bytesRead);
NSLog(#"buffer: %s", buffer);
recv_len += bytes;
}
/* Send the punchline */
while (send_len < (strlen(punchline+1))) {
if (CFWriteStreamCanAcceptBytes(writeStream)) {
bytes = CFWriteStreamWrite(writeStream,
(unsigned char *) punchline + send_len,
(strlen((punchline)+1) - send_len) );
if (bytes < 0) {
fprintf(stderr, "CFWriteStreamWrite() failed\n");
close(sock);
return;
}
send_len += bytes;
}
close(sock);
CFReadStreamClose(readStream);
CFWriteStreamClose(writeStream);
return;
}
}
Everything is ok when i run it on Ios Application (Default setting by Xcode when create new project)
But when i copy that source code to project create by Cocos2dx.
I got an error at this line:
char *punchline = info;
Error message:
Can not initialize a variable of type 'char *' with an Ivalue of type 'void *'
I don't know which setting should be change to run it.
Thanks.
I have been having a lot of trouble finding a way to query the DNS to find the NAPTR in iOS. There seem to be many relatively simple ways to resolve to an IP, but I specifically need to find all NAPTR records in a DNS lookup. I'd prefer to do so without having to bring in any external libraries if at all possible. If anyone has been able to do this (or something similar that I can extrapolate from) I'd appreciate any pointers.
All code must function in iOS 5.0+
I ended up using DNSServiceQueryRecord.
DNSServiceRef sdRef;
DNSServiceQueryRecord(&sdRef, 0, 0,
"google.com",
kDNSServiceType_NAPTR,
kDNSServiceClass_IN,
callback,
NULL);
DNSServiceProcessResult(sdRef);
DNSServiceRefDeallocate(sdRef);
In actual use, I found that there was an issue where the app would hang indefinitely if there were no results, so I ended up having to adjust my code to add a timeout on the result.
/*
Attempt to fetch the NAPTR from the stored server address. Since iOS will continue waiting
until told directly to stop (even if there is no result) we must set our own timeout on the
request (set to 5 seconds).
On success, the callback function is called. On timeout, the kSRVLookupComplete notification
is sent.
*/
- (void)attemptNAPTRFetch {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
DNSServiceRef sdRef;
DNSServiceErrorType err;
err = DNSServiceQueryRecord(&sdRef, 0, 0,
[server cStringUsingEncoding:[NSString defaultCStringEncoding]],
kDNSServiceType_NAPTR,
kDNSServiceClass_IN,
callback,
NULL);
// This stuff is necessary so we don't hang forever if there are no results
int dns_sd_fd = DNSServiceRefSockFD(sdRef);
int nfds = dns_sd_fd + 1;
fd_set readfds;
struct timeval tv;
int result;
int stopNow = 0;
int timeOut = 5; // Timeout in seconds
while (!stopNow) {
FD_ZERO(&readfds);
FD_SET(dns_sd_fd, &readfds);
tv.tv_sec = timeOut;
tv.tv_usec = 0;
result = select(nfds, &readfds, (fd_set*)NULL, (fd_set*)NULL, &tv);
if (result > 0) {
if(FD_ISSET(dns_sd_fd, &readfds)) {
err = DNSServiceProcessResult(sdRef);
if (err != kDNSServiceErr_NoError){
NSLog(#"There was an error");
}
stopNow = 1;
}
}
else {
printf("select() returned %d errno %d %s\n", result, errno, strerror(errno));
if (errno != EINTR) {
stopNow = 1;
postNotification(kSRVLookupComplete, nil);
}
}
}
DNSServiceRefDeallocate(sdRef);
});
}
Then, for the callback:
static void callback(DNSServiceRef sdRef,
DNSServiceFlags flags,
uint32_t interfaceIndex,
DNSServiceErrorType errorCode,
const char *fullname,
uint16_t rrtype,
uint16_t rrclass,
uint16_t rdlen,
const void *rdata,
uint32_t ttl,
void *context)
{
uint16_t order, pref;
char flag;
NSMutableString *service = [[NSMutableString alloc] init];
NSMutableString *replacement = [[NSMutableString alloc] init];
const char *data = (const char*)rdata;
order = data[1];
pref = data[3];
flag = data[5];
int i = 7;
while (data[i] != 0){
[service appendString:[NSString stringWithFormat:#"%c", data[i]]];
i++;
}
i += 2;
while(data[i] != 0){
if(data[i] >= 32 && data[i] <= 127)
[replacement appendString:[NSString stringWithFormat:#"%c", data[i]]];
else
[replacement appendString:#"."];
i++;
}
NSLog(#"\nOrder: %i\nPreference: %i\nFlag: %c\nService: %#\nReplacement: %#\n", order, pref, flag, service, replacement);
}
This seems to do the trick for me. You would of course do any other necessary work using all the parsed data in the callback or store the data somewhere to be used later.
Have been doing some google search and some reading on this subject but cannot seem to get it right no matter how much time i spent searching.
What i want to do is to receive broadcast message of devices that are connected on my network by advertising my interest in their services that they supply. Using wireshark i can see the broadcast/notification messages from the network devices that i want to connect to sent over my network but not my broadcast search for interest of their services.
But with network utility i can see that the socket is created but don't know which state it is in, whether listen or connected.
Yes i know that there are libraries that i can use to do this, but i wanted to build something of my own from the ground up and get a better understand of how it works.
MySocket.h
#import <Foundation/Foundation.h>
#import <CoreFoundation/CoreFoundation.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#if TARGET_OS_IPHONE
#import <CFNetwork/CFNetwork.h>
#endif
#interface MySocket : NSObject
{
NSString* _message;
CFSocketRef cfSocket;
CFRunLoopSourceRef cfSource;
}
- (void)listen;
#end
MySocket.m
#import "MySocket.h"
#define MAX_UDP_DATAGRAM_SIZE 65507
#implementation MySocket
static void socketCallback(CFSocketRef cfSocket, CFSocketCallBackType
type, CFDataRef address, const void *data, void *userInfo)
{
NSLog(#"socketCAllBAck was called");
}
- (void)listen
{
//Enable broadcast to network hosts
int yes = 1;
int setSockResult = 0;
_message = [[NSMutableString alloc ] initWithString: #"M-SEARCH *HTTP/1.1\r\nHOST:239.255.255.250:1900\r\nMAN:\"ssdp:discover\"\r\nST:ssdp:all\r\nMX:1\r\n\r\n"];
CFSocketContext socketContext = {0, self, NULL, NULL, NULL};
/* Create the server socket as a UDP IPv4 socket and set a callback */
/* for calls to the socket's lower-level accept() function */
cfSocket = CFSocketCreate(NULL, PF_INET, SOCK_DGRAM, IPPROTO_UDP,
kCFSocketAcceptCallBack | kCFSocketDataCallBack , (CFSocketCallBack)socketCallback, &socketContext);
if (cfSocket == NULL)
NSLog(#"UDP socket could not be created\n");
/* Re-use local addresses, if they're still in TIME_WAIT */
setSockResult = setsockopt(CFSocketGetNative(cfSocket), SOL_SOCKET, SO_BROADCAST, (void *)&yes, sizeof(yes));
if(setSockResult < 0)
NSLog(#"Could not setsockopt for broabcast");
/* Set the port and address we want to listen on */
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_len = sizeof(addr);
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr("239.255.255.250");
//inet_pton(AF_INET, "239.255.255.250", &(addr.sin_addr));
addr.sin_port = htons(1900);
//addr.sin_addr.s_addr = htonl(INADDR_ANY);
NSData *address = [ NSData dataWithBytes: &addr length: sizeof(addr) ];
if (address != nil && CFSocketSetAddress(cfSocket, (CFDataRef) address) != kCFSocketSuccess) {
NSLog(#"CFSocketSetAddress() failed\n");
CFRelease(cfSocket);
}
CFDataRef data = CFDataCreate(NULL, (const UInt8*)[_message UTF8String], [_message lengthOfBytesUsingEncoding:NSUTF8StringEncoding]);
setSockResult = CFSocketSendData(cfSocket, (CFDataRef)address, data, 0.0);
if(kCFSocketSuccess != setSockResult) NSLog(#"Unable to send data, %i", setSockResult);
else NSLog(#"Sending data");
cfSource = CFSocketCreateRunLoopSource(kCFAllocatorDefault, cfSocket, 0);
if(cfSource == NULL)
NSLog(#"CFRunLoopSourceRef is null");
CFRunLoopAddSource(CFRunLoopGetCurrent(), cfSource, kCFRunLoopDefaultMode);
NSLog(#"Socket listening on port 1900");
CFRelease(cfSource);
CFRelease(cfSocket);
[address release];
data = nil;
CFRunLoopRun();
}
- (void)dealloc
{
CFRunLoopRemoveSource(CFRunLoopGetCurrent(), cfSource, kCFRunLoopDefaultMode);
CFRelease(cfSource);
CFRelease(cfSocket);
[_message release];
[super dealloc];
}
#end
Edit: Everything runs well until the call to send data.
Is there something small but critical in order for this to work that i'm missing?
Or i'm missing the big picture?
Any help or guide is appreciated.
Thanks in advance and have a nice weekend
remove SetAdress and all will be work fine. i've tested this now;
How about use this initialization with address
CFDataRef address=CFDataCreate(kCFAllocatorDefault,(UInt8 *)&addr,sizeof(addr));