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dns_sd_bonjour.c
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dns_sd_bonjour.c
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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* libiio - Library for interfacing industrial I/O (IIO) devices
*
* Copyright (C) 2020 Matej Kenda.
* Author: Matej Kenda <matejken<at>gmail.com>
* Robin Getz <[email protected]>
*/
#include "dns_sd.h"
#include "network.h" // for FQDN_LEN
#include <arpa/inet.h>
#include <netinet/in.h>
#include <CFNetwork/CFNetwork.h>
#include <iio/iio-backend.h>
#include <iio/iio-debug.h>
#include <iio/iio-lock.h>
/*
* Implementation for DNS SD discovery for macOS using CFNetServices.
*/
static void __cfnet_browser_cb(CFNetServiceBrowserRef browser,
CFOptionFlags flags,
CFTypeRef domainOrService,
CFStreamError *error,
void *info)
{
const CFNetServiceRef netService = (CFNetServiceRef)domainOrService;
struct dns_sd_cb_data *bdata = info;
struct dns_sd_discovery_data *dd = bdata->d;
const struct iio_context_params *params = bdata->params;
char address[DNS_SD_ADDRESS_STR_MAX+1] = "";
char hostname[FQDN_LEN];
char name[FQDN_LEN];
struct sockaddr_in6 *sa6;
struct sockaddr_in *sa;
CFStreamError anError;
CFStringRef targetHost;
CFStringRef svcName;
CFArrayRef addrArr;
CFDataRef data;
SInt32 port;
char *ptr;
if ((flags & kCFNetServiceFlagIsDomain) != 0) {
prm_err(params, "DNS SD: FATAL! Callback called for domain, not service.\n");
goto stop_browsing;
}
if (dd == NULL) {
prm_err(params, "DNS SD: Missing info structure. Stop browsing.\n");
goto stop_browsing;
}
if ((flags & kCFNetServiceFlagRemove) != 0) {
prm_dbg(params, "DNS SD: Callback to remove service. Ignore.\n");
return;
}
iio_mutex_lock(dd->lock);
if (netService == NULL) {
prm_dbg(params, "DNS SD: Net service is null.\n");
goto verify_flags;
}
if (!CFNetServiceResolveWithTimeout(netService, 10.0, &anError)) {
prm_dbg(params, "DNS SD: Resolve error: %ld.%d\n",
anError.domain, anError.error);
goto exit;
}
targetHost = CFNetServiceGetTargetHost(netService);
if (targetHost == NULL) {
prm_dbg(params, "DNS SD: No valid target host for service.\n");
goto exit;
}
if (!CFStringGetCString(targetHost, hostname,
sizeof(hostname), kCFStringEncodingASCII)) {
prm_err(params, "DNS SD: Could not translate hostname\n");
goto exit;
}
svcName = CFNetServiceGetName(netService);
if (!CFStringGetCString(svcName, name,
sizeof(name), kCFStringEncodingASCII)) {
prm_err(params, "DNS SD: Could not translate service name\n");
goto exit;
}
port = CFNetServiceGetPortNumber(netService);
addrArr = CFNetServiceGetAddressing(netService);
if (addrArr == NULL) {
prm_warn(params, "DNS SD: No valid addresses for service %s.\n",
name);
goto exit;
}
/* Set properties on the last element on the list. */
while (dd->next)
dd = dd->next;
for (CFIndex i = 0; i < CFArrayGetCount(addrArr); i++) {
data = CFArrayGetValueAtIndex(addrArr, i);
sa = (struct sockaddr_in *) CFDataGetBytePtr(data);
sa6 = (struct sockaddr_in6 *) sa;
switch(sa->sin_family) {
case AF_INET:
if (inet_ntop(sa->sin_family, &sa->sin_addr,
address, sizeof(address)))
break;
continue;
case AF_INET6:
if (inet_ntop(sa->sin_family, &sa6->sin6_addr,
address, sizeof(address)))
break;
continue;
default:
continue;
}
dd->port = port;
dd->hostname = strdup(hostname);
iio_strlcpy(dd->addr_str, address, sizeof(dd->addr_str));
ptr = dd->addr_str + strnlen(dd->addr_str, DNS_SD_ADDRESS_STR_MAX);
if (sa->sin_family == AF_INET6
&& sa6->sin6_addr.s6_addr[0] == 0xfe
&& sa6->sin6_addr.s6_addr[1] == 0x80
&& if_indextoname((unsigned int)sa6->sin6_scope_id, ptr + 1)) {
*ptr = '%';
}
/* A list entry was filled, prepare new item on the list. */
dd->next = zalloc(sizeof(*dd->next));
if (dd->next) {
/* duplicate lock */
dd->next->lock = dd->lock;
} else {
prm_err(params, "DNS SD Bonjour Resolver : memory failure\n");
}
prm_dbg(params, "DNS SD: added %s (%s:%d)\n",
hostname, dd->addr_str, port);
dd = dd->next;
}
verify_flags:
if ((flags & kCFNetServiceFlagMoreComing) == 0) {
prm_dbg(params, "DNS SD: No more entries coming.\n");
CFNetServiceBrowserStopSearch(browser, &anError);
}
exit:
iio_mutex_unlock(dd->lock);
return;
stop_browsing:
CFNetServiceBrowserStopSearch(browser, &anError);
}
int dnssd_find_hosts(const struct iio_context_params *params,
struct dns_sd_discovery_data **ddata)
{
CFNetServiceClientContext clientContext = { 0 };
CFNetServiceBrowserRef serviceBrowser;
struct dns_sd_discovery_data *d;
struct dns_sd_cb_data bdata;
CFRunLoopRunResult runRes;
CFRunLoopRef runLoop;
CFStringRef type;
CFStringRef domain;
CFStreamError error;
Boolean result;
int ret;
prm_dbg(params, "DNS SD: Start service discovery.\n");
d = zalloc(sizeof(*d));
if (!d)
return -ENOMEM;
d->lock = iio_mutex_create();
ret = iio_err(d->lock);
if (ret) {
dnssd_free_all_discovery_data(params, d);
return ret;
}
bdata.d = d;
bdata.params = params;
clientContext.info = &bdata;
serviceBrowser = CFNetServiceBrowserCreate(kCFAllocatorDefault,
__cfnet_browser_cb,
&clientContext);
if (serviceBrowser == NULL) {
prm_err(params, "DNS SD: Failed to create service browser.\n");
dnssd_free_all_discovery_data(params, d);
ret = -ENOMEM;
goto exit;
}
runLoop = CFRunLoopGetCurrent();
CFNetServiceBrowserScheduleWithRunLoop(serviceBrowser, runLoop,
kCFRunLoopDefaultMode);
type = CFSTR("_iio._tcp.");
domain = CFSTR("");
result = CFNetServiceBrowserSearchForServices(serviceBrowser,
domain, type, &error);
if (result == false) {
prm_err(params, "DNS SD: CFNetServiceBrowserSearchForServices "
"failed (domain = %ld, error = %d)\n",
(long)error.domain, error.error);
ret = -ENXIO;
} else {
runRes = CFRunLoopRunInMode(kCFRunLoopDefaultMode, 2, true);
if (runRes != kCFRunLoopRunHandledSource && runRes != kCFRunLoopRunTimedOut) {
if (runRes == kCFRunLoopRunFinished) {
prm_err(params, "DNS SD: CFRunLoopRunInMode completed "
"kCFRunLoopRunFinished (%d)\n", runRes);
} else if (runRes == kCFRunLoopRunStopped) {
prm_err(params, "DNS SD: CFRunLoopRunInMode completed "
"kCFRunLoopRunStopped (%d)\n", runRes);
} else {
prm_err(params, "DNS SD: CFRunLoopRunInMode completed "
"for unknown reason (%d)\n", runRes);
}
} else {
if (runRes == kCFRunLoopRunHandledSource) {
prm_dbg(params, "DNS SD: CFRunLoopRunInMode completed "
"kCFRunLoopRunHandledSource (%d)\n", runRes);
} else {
prm_dbg(params, "DNS SD: CFRunLoopRunInMode completed "
"kCFRunLoopRunTimedOut (%d)\n", runRes);
}
}
remove_dup_discovery_data(params, &d);
port_knock_discovery_data(params, &d);
*ddata = d;
}
CFNetServiceBrowserUnscheduleFromRunLoop(serviceBrowser, runLoop, kCFRunLoopDefaultMode);
CFRelease(serviceBrowser);
serviceBrowser = NULL;
prm_dbg(params, "DNS SD: Completed service discovery, "
"return code : %d\n", ret);
exit:
iio_mutex_destroy(d->lock);
return ret;
}
int dnssd_resolve_host(const struct iio_context_params *params,
const char *hostname, char *ip_addr, const int addr_len)
{
return -ENOENT;
}