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upnp.c
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upnp.c
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#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <time.h>
#include "upnptools.h"
#include "ithread.h"
#include "upnp.h"
#include "wphoto.h"
const char *server_ip;
int server_port;
static UpnpDevice_Handle device_handle = -1;
static UpnpClient_Handle client_handle = -1;
/*
* This is used to signal the main thread of stage changes of the device
* or client. The mutex protects all the three variables.
*/
ithread_mutex_t state_mutex;
ithread_cond_t state_cond;
/* URL of the discovered camera device */
char *camera_url;
/* camera issued a GET request to our device */
int camera_responded;
/* M-SEARCH timed out */
int discovery_timeout;
#define ADVERTISEMENT_INTERVAL 3
#define MSEARCH_INTERVAL 5
#define CAMERA_SERVICE_NAME "urn:schemas-canon-com:service:MobileConnectedCameraService:1"
void upnp_perror(const char *message, int err)
{
fprintf(stderr, "%s: %s (%d)\n", message, UpnpGetErrorMessage(err), err);
};
/* strcmp() that accepts NULL pointers */
static int strcmp_null(const char *s1, const char *s2)
{
if (!s1 || !s2)
return !!s1 - !!s2;
return strcmp(s1, s2);
}
static int upnp_device_event_handler(Upnp_EventType type, void *event,
void *cookie)
{
fprintf(stderr, "device event: %d, %p, %p\n", type, event, cookie);
return 0;
}
static int upnp_client_event_handler(Upnp_EventType type, void *event,
void *cookie)
{
struct Upnp_Discovery *devent = event;
/* ignore devices other than the camera */
switch (type) {
case UPNP_DISCOVERY_ADVERTISEMENT_ALIVE:
case UPNP_DISCOVERY_ADVERTISEMENT_BYEBYE:
case UPNP_DISCOVERY_SEARCH_RESULT:
if (strcmp(devent->ServiceType, CAMERA_SERVICE_NAME) != 0)
return 0;
break;
default:
;
}
switch (type) {
case UPNP_DISCOVERY_SEARCH_TIMEOUT:
ithread_mutex_lock(&state_mutex);
discovery_timeout = 1;
ithread_cond_signal(&state_cond);
ithread_mutex_unlock(&state_mutex);
break;
case UPNP_DISCOVERY_ADVERTISEMENT_ALIVE:
case UPNP_DISCOVERY_SEARCH_RESULT:
printf("discovery event: %d\n", type);
ithread_mutex_lock(&state_mutex);
if (strcmp_null(camera_url, devent->Location) != 0) {
free(camera_url);
camera_url = strdup(devent->Location);
ithread_cond_signal(&state_cond);
}
ithread_mutex_unlock(&state_mutex);
break;
case UPNP_DISCOVERY_ADVERTISEMENT_BYEBYE:
fprintf(stderr, "FIXME: camera disconnected\n");
break;
default:
fprintf(stderr, "unhandled client event: %d, %p, %p\n", type, event, cookie);
}
return 0;
}
static const char *web_MobileDevDesc(void *data, const char *query)
{
return xml_MobileDevDesc;
}
static const char *web_CameraConnectedMobile(void *data, const char *query)
{
ithread_mutex_lock(&state_mutex);
camera_responded = 1;
ithread_cond_signal(&state_cond);
ithread_mutex_unlock(&state_mutex);
return xml_CameraConnectedMobile;
}
static int ping_camera(const char *url)
{
const char *cp;
char *url2, *p;
static const char *uuid;
static size_t uuid_len;
static const char path[] = "/desc_iml/MobileConnectedCamera.xml?uuid=";
size_t base_len, len;
char *outbuf, contenttype[LINE_SIZE];
int err;
/* Find the http://host:port part of the url */
cp = strstr(url, "://");
if (!cp) {
fprintf(stderr, "Invalid device URL: %s\n", url);
abort();
return -1;
}
cp += 3;
cp = strchr(cp, '/');
if (!cp)
cp = url + strlen(url);
base_len = cp - url;
if (base_len > 1024) {
fprintf(stderr, "Device URL too long: %s\n", url);
return -1;
}
if (!uuid) {
uuid = get_uuid();
uuid_len = strlen(uuid);
}
/* paste baseurl + path + uuid */
len = base_len + sizeof(path) - 1 + uuid_len;
url2 = malloc(len + 1);
if (!url2) {
perror("Memory allocation failure");
return -1;
}
url2[len] = '\0';
memcpy(url2, url, cp - url);
p = url2 + (cp - url);
memcpy(p, path, sizeof(path) - 1);
p += sizeof(path) - 1;
memcpy(p, uuid, uuid_len);
fprintf(stderr, "url2: \"%s\"\n", url2);
outbuf = NULL;
err = UpnpDownloadUrlItem(url2, &outbuf, contenttype);
/* FIXME: Check that the XML contains what we expect */
free(outbuf);
if (err)
upnp_perror("UpnpDownloadUrlItem", err);
return err;
}
int wphoto_upnp_handshake(void)
{
int ret = -1, err;
char descurl[256];
const char *desc_xml = "MobileDevDesc.xml";
struct timespec timer;
int camera_responded_save;
char *camera_url_save;
int pinged_camera;
ithread_mutex_init(&state_mutex, NULL);
ithread_cond_init(&state_cond, NULL);
camera_url = NULL;
camera_responded = 0;
err = UpnpInit(NULL, 0);
if (err != UPNP_E_SUCCESS) {
upnp_perror("UpnpInit", err);
goto err_init;
}
server_ip = UpnpGetServerIpAddress();
server_port = UpnpGetServerPort();
if (init_xml_docs() < 0) {
perror("init_xml_docs");
goto err_init;
}
printf("address: %s:%d\n", server_ip, server_port);
snprintf(descurl, sizeof(descurl), "http://%s:%d/%s",
server_ip, server_port, desc_xml);
err = web_add_callback("/MobileDevDesc.xml", web_MobileDevDesc, NULL);
if (err) {
perror("web_add_callback");
goto err_init;
}
err = web_add_callback("/desc_iml/CameraConnectedMobile.xml",
web_CameraConnectedMobile, NULL);
if (err) {
perror("web_add_callback");
goto err_init;
}
if (web_start() < 0) {
printf("web_init error\n");
goto err_init;
}
err = UpnpRegisterRootDevice(descurl, upnp_device_event_handler,
&device_handle, &device_handle);
if (err != UPNP_E_SUCCESS) {
upnp_perror("UpnpRegisterRootDevice", err);
goto err_init;
}
err = UpnpRegisterClient(upnp_client_event_handler,
&client_handle, &client_handle);
if (err != UPNP_E_SUCCESS) {
upnp_perror("UpnpRegisterClient", err);
goto err_register;
}
clock_gettime(CLOCK_REALTIME, &timer);
discovery_timeout = 1;
camera_responded_save = 0;
camera_url_save = NULL;
pinged_camera = 0;
do {
int wait_err;
if (!camera_responded_save) {
err = UpnpSendAdvertisement(device_handle, 0);
if (err != UPNP_E_SUCCESS) {
upnp_perror("UpnpSendAdvertisement", err);
goto err_register;
}
printf("NOTIFY sent\n");
}
if (camera_url_save && !pinged_camera)
if (ping_camera(camera_url_save) == 0)
pinged_camera = 1;
timer.tv_sec += ADVERTISEMENT_INTERVAL;
wait:
ithread_mutex_lock(&state_mutex);
wait_err = 0;
while (camera_responded == camera_responded_save &&
strcmp_null(camera_url, camera_url_save) == 0 &&
!discovery_timeout && wait_err == 0)
wait_err = ithread_cond_timedwait(
&state_cond, &state_mutex, &timer);
camera_responded_save = camera_responded;
if (strcmp_null(camera_url, camera_url_save) != 0) {
free(camera_url_save);
camera_url_save = strdup(camera_url);
}
/*
* Once we have the camera url, we stop sending M-SEARCH
* requests
*/
if (discovery_timeout && !camera_url_save) {
err = UpnpSearchAsync(client_handle, MSEARCH_INTERVAL,
CAMERA_SERVICE_NAME, (void*)42);
if (err != UPNP_E_SUCCESS) {
upnp_perror("UpnpSearchAsync", err);
goto err_register;
}
printf("M-SEARCH sent\n");
}
discovery_timeout = 0;
ithread_mutex_unlock(&state_mutex);
if (wait_err != ETIMEDOUT &&
(!pinged_camera || !camera_responded_save))
goto wait;
} while (!pinged_camera || !camera_responded_save);
return 0;
err_register:
UpnpUnRegisterRootDevice(device_handle);
err_init:
UpnpFinish();
return ret;
}