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stream.c
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/*
* stream.c (based in webcam.c)
* Streaming using jpeg images over a multipart/x-mixed-replace stream
* Copyright (C) 2002 Jeroen Vreeken ([email protected])
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "md5.h"
#include "picture.h"
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <ctype.h>
#include <sys/fcntl.h>
#define STREAM_REALM "Motion Stream Security Access"
#define KEEP_ALIVE_TIMEOUT 100
typedef void* (*auth_handler)(void*);
struct auth_param {
struct context *cnt;
int sock;
int sock_flags;
int* thread_count;
struct config *conf;
};
pthread_mutex_t stream_auth_mutex;
/**
* set_sock_timeout
*
* Returns : 0 or 1 on timeout
*/
static int set_sock_timeout(int sock, int sec)
{
struct timeval tv;
tv.tv_sec = sec;
tv.tv_usec = 0;
if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (char*) &tv, sizeof(tv))) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: set socket timeout failed");
return 1;
}
return 0;
}
/**
* read_http_request
*
*
* Returns : 1 on success or 0 if any error happens
*/
static int read_http_request(int sock, char* buffer, int buflen, char* uri, int uri_len)
{
int nread = 0;
int ret,readb = 1;
char method[10] = {'\0'};
char url[512] = {'\0'};
char protocol[10] = {'\0'};
static const char *bad_request_response_raw =
"HTTP/1.0 400 Bad Request\r\n"
"Content-type: text/plain\r\n\r\n"
"Bad Request\n";
static const char *bad_method_response_template_raw =
"HTTP/1.0 501 Method Not Implemented\r\n"
"Content-type: text/plain\r\n\r\n"
"Method Not Implemented\n";
static const char *timeout_response_template_raw =
"HTTP/1.0 408 Request Timeout\r\n"
"Content-type: text/plain\r\n\r\n"
"Request Timeout\n";
buffer[0] = '\0';
while ((strstr(buffer, "\r\n\r\n") == NULL) && (readb != 0) && (nread < buflen)) {
readb = read(sock, buffer+nread, buflen - nread);
if (readb == -1) {
nread = -1;
break;
}
nread += readb;
if (nread > buflen) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: motion-stream End buffer reached"
" waiting for buffer ending");
break;
}
buffer[nread] = '\0';
}
/*
* Make sure the last read didn't fail. If it did, there's a
* problem with the connection, so give up.
*/
if (nread == -1) {
if(errno == EAGAIN) { // Timeout
ret = write(sock, timeout_response_template_raw, strlen(timeout_response_template_raw));
return 0;
}
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: motion-stream READ give up!");
return 0;
}
ret = sscanf(buffer, "%9s %511s %9s", method, url, protocol);
if (ret != 3) {
ret = write(sock, bad_request_response_raw, sizeof(bad_request_response_raw));
return 0;
}
/* Check Protocol */
if (strcmp(protocol, "HTTP/1.0") && strcmp (protocol, "HTTP/1.1")) {
/* We don't understand this protocol. Report a bad response. */
ret = write(sock, bad_request_response_raw, sizeof(bad_request_response_raw));
return 0;
}
if (strcmp(method, "GET")) {
/*
* This server only implements the GET method. If client
* uses other method, report the failure.
*/
char response[1024];
snprintf(response, sizeof(response), bad_method_response_template_raw, method);
ret = write(sock, response, strlen (response));
return 0;
}
if(uri)
strncpy(uri, url, uri_len);
return 1;
}
static void stream_add_client(struct stream *list, int sc);
/**
* handle_basic_auth
*
*
*/
static void* handle_basic_auth(void* param)
{
struct auth_param *p = (struct auth_param*)param;
char buffer[1024] = {'\0'};
ssize_t length = 1023;
char *auth, *h, *authentication;
static const char *request_auth_response_template=
"HTTP/1.0 401 Authorization Required\r\n"
"Server: Motion/"VERSION"\r\n"
"Max-Age: 0\r\n"
"Expires: 0\r\n"
"Cache-Control: no-cache, private\r\n"
"Pragma: no-cache\r\n"
"WWW-Authenticate: Basic realm=\""STREAM_REALM"\"\r\n\r\n";
MOTION_PTHREAD_SETNAME("handle_basic_auth");
pthread_mutex_lock(&stream_auth_mutex);
p->thread_count++;
pthread_mutex_unlock(&stream_auth_mutex);
if (!read_http_request(p->sock,buffer, length, NULL, 0))
goto Invalid_Request;
auth = strstr(buffer, "Authorization: Basic");
if (!auth)
goto Error;
auth += sizeof("Authorization: Basic");
h = strstr(auth, "\r\n");
if(!h)
goto Error;
*h='\0';
if (p->conf->stream_authentication != NULL) {
char *userpass = NULL;
size_t auth_size = strlen(p->conf->stream_authentication);
authentication = mymalloc(BASE64_LENGTH(auth_size) + 1);
userpass = mymalloc(auth_size + 4);
/* motion_base64_encode can read 3 bytes after the end of the string, initialize it. */
memset(userpass, 0, auth_size + 4);
strcpy(userpass, p->conf->stream_authentication);
motion_base64_encode(userpass, authentication, auth_size);
free(userpass);
if (strcmp(auth, authentication)) {
free(authentication);
goto Error;
}
free(authentication);
}
// OK - Access
/* Set socket to non blocking */
if (fcntl(p->sock, F_SETFL, p->sock_flags) < 0) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: fcntl");
goto Error;
}
/* Lock the mutex */
pthread_mutex_lock(&stream_auth_mutex);
stream_add_client(&p->cnt->stream, p->sock);
p->cnt->stream_count++;
p->thread_count--;
/* Unlock the mutex */
pthread_mutex_unlock(&stream_auth_mutex);
free(p);
pthread_exit(NULL);
Error:
if (write(p->sock, request_auth_response_template, strlen (request_auth_response_template)) < 0)
MOTION_LOG(DBG, TYPE_STREAM, SHOW_ERRNO, "%s: write failure 1:handle_basic_auth");
Invalid_Request:
close(p->sock);
pthread_mutex_lock(&stream_auth_mutex);
p->thread_count--;
pthread_mutex_unlock(&stream_auth_mutex);
free(p);
pthread_exit(NULL);
}
#define HASHLEN 16
typedef char HASH[HASHLEN];
#define HASHHEXLEN 32
typedef char HASHHEX[HASHHEXLEN+1];
#define IN
#define OUT
/**
* CvtHex
* Calculates H(A1) as per HTTP Digest spec -- taken from RFC 2617.
*/
static void CvtHex(IN HASH Bin, OUT HASHHEX Hex)
{
unsigned short i;
unsigned char j;
for (i = 0; i < HASHLEN; i++) {
j = (Bin[i] >> 4) & 0xf;
if (j <= 9)
Hex[i*2] = (j + '0');
else
Hex[i*2] = (j + 'a' - 10);
j = Bin[i] & 0xf;
if (j <= 9)
Hex[i*2+1] = (j + '0');
else
Hex[i*2+1] = (j + 'a' - 10);
};
Hex[HASHHEXLEN] = '\0';
};
/**
* DigestCalcHA1
* Calculates H(A1) as per spec.
*/
static void DigestCalcHA1(
IN char * pszAlg,
IN char * pszUserName,
IN char * pszRealm,
IN char * pszPassword,
IN char * pszNonce,
IN char * pszCNonce,
OUT HASHHEX SessionKey
)
{
MD5_CTX Md5Ctx;
HASH HA1;
MD5Init(&Md5Ctx);
MD5Update(&Md5Ctx, (unsigned char *)pszUserName, strlen(pszUserName));
MD5Update(&Md5Ctx, (unsigned char *)":", 1);
MD5Update(&Md5Ctx, (unsigned char *)pszRealm, strlen(pszRealm));
MD5Update(&Md5Ctx, (unsigned char *)":", 1);
MD5Update(&Md5Ctx, (unsigned char *)pszPassword, strlen(pszPassword));
MD5Final((unsigned char *)HA1, &Md5Ctx);
if (strcmp(pszAlg, "md5-sess") == 0) {
MD5Init(&Md5Ctx);
MD5Update(&Md5Ctx, (unsigned char *)HA1, HASHLEN);
MD5Update(&Md5Ctx, (unsigned char *)":", 1);
MD5Update(&Md5Ctx, (unsigned char *)pszNonce, strlen(pszNonce));
MD5Update(&Md5Ctx, (unsigned char *)":", 1);
MD5Update(&Md5Ctx, (unsigned char *)pszCNonce, strlen(pszCNonce));
MD5Final((unsigned char *)HA1, &Md5Ctx);
};
CvtHex(HA1, SessionKey);
};
/**
* DigestCalcResponse
* Calculates request-digest/response-digest as per HTTP Digest spec.
*/
static void DigestCalcResponse(
IN HASHHEX HA1, /* H(A1) */
IN char * pszNonce, /* nonce from server */
IN char * pszNonceCount, /* 8 hex digits */
IN char * pszCNonce, /* client nonce */
IN char * pszQop, /* qop-value: "", "auth", "auth-int" */
IN char * pszMethod, /* method from the request */
IN char * pszDigestUri, /* requested URL */
IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */
OUT HASHHEX Response /* request-digest or response-digest */
)
{
MD5_CTX Md5Ctx;
HASH HA2;
HASH RespHash;
HASHHEX HA2Hex;
// Calculate H(A2)
MD5Init(&Md5Ctx);
MD5Update(&Md5Ctx, (unsigned char *)pszMethod, strlen(pszMethod));
MD5Update(&Md5Ctx, (unsigned char *)":", 1);
MD5Update(&Md5Ctx, (unsigned char *)pszDigestUri, strlen(pszDigestUri));
if (strcmp(pszQop, "auth-int") == 0) {
MD5Update(&Md5Ctx, (unsigned char *)":", 1);
MD5Update(&Md5Ctx, (unsigned char *)HEntity, HASHHEXLEN);
}
MD5Final((unsigned char *)HA2, &Md5Ctx);
CvtHex(HA2, HA2Hex);
// Calculate response
MD5Init(&Md5Ctx);
MD5Update(&Md5Ctx, (unsigned char *)HA1, HASHHEXLEN);
MD5Update(&Md5Ctx, (unsigned char *)":", 1);
MD5Update(&Md5Ctx, (unsigned char *)pszNonce, strlen(pszNonce));
MD5Update(&Md5Ctx, (unsigned char *)":", 1);
if (*pszQop) {
MD5Update(&Md5Ctx, (unsigned char *)pszNonceCount, strlen(pszNonceCount));
MD5Update(&Md5Ctx, (unsigned char *)":", 1);
MD5Update(&Md5Ctx, (unsigned char *)pszCNonce, strlen(pszCNonce));
MD5Update(&Md5Ctx, (unsigned char *)":", 1);
MD5Update(&Md5Ctx, (unsigned char *)pszQop, strlen(pszQop));
MD5Update(&Md5Ctx, (unsigned char *)":", 1);
}
MD5Update(&Md5Ctx, (unsigned char *)HA2Hex, HASHHEXLEN);
MD5Final((unsigned char *)RespHash, &Md5Ctx);
CvtHex(RespHash, Response);
};
/**
* handle_md5_digest
*
*
*/
static void* handle_md5_digest(void* param)
{
struct auth_param *p = (struct auth_param*)param;
char buffer[1024] = {'\0'};
ssize_t length = 1023;
char *auth, *h, *username, *realm, *uri, *nonce, *response;
int username_len, realm_len, uri_len, nonce_len, response_len;
#define SERVER_NONCE_LEN 17
char server_nonce[SERVER_NONCE_LEN];
#define SERVER_URI_LEN 512
char server_uri[SERVER_URI_LEN];
char* server_user = NULL, *server_pass = NULL;
unsigned int rand1,rand2;
HASHHEX HA1;
HASHHEX HA2 = "";
HASHHEX server_response;
static const char *request_auth_response_template=
"HTTP/1.0 401 Authorization Required\r\n"
"Server: Motion/"VERSION"\r\n"
"Max-Age: 0\r\n"
"Expires: 0\r\n"
"Cache-Control: no-cache, private\r\n"
"Pragma: no-cache\r\n"
"WWW-Authenticate: Digest";
static const char *auth_failed_html_template=
"<!DOCTYPE html>\n"
"<html>\n"
"<head><title>401 Authorization Required</title></head>\n"
"<body>\n"
"<h1>Authorization Required</h1>\n"
"<p>This server could not verify that you are authorized to access the document "
"requested. Either you supplied the wrong credentials (e.g., bad password), "
"or your browser doesn't understand how to supply the credentials required.</p>\n"
"</body>\n"
"</html>\n";
static const char *internal_error_template=
"HTTP/1.0 500 Internal Server Error\r\n"
"Server: Motion/"VERSION"\r\n"
"Content-Type: text/html\r\n"
"Connection: Close\r\n\r\n"
"<!DOCTYPE html>\n"
"<html>\n"
"<head><title>500 Internal Server Error</title></head>\n"
"<body>\n"
"<h1>500 Internal Server Error</h1>\n"
"</body>\n"
"</html>\n";
MOTION_PTHREAD_SETNAME("handle_md5_digest");
pthread_mutex_lock(&stream_auth_mutex);
p->thread_count++;
pthread_mutex_unlock(&stream_auth_mutex);
set_sock_timeout(p->sock, KEEP_ALIVE_TIMEOUT);
srand(time(NULL));
rand1 = (unsigned int)(42000000.0 * rand() / (RAND_MAX + 1.0));
rand2 = (unsigned int)(42000000.0 * rand() / (RAND_MAX + 1.0));
snprintf(server_nonce, SERVER_NONCE_LEN, "%08x%08x", rand1, rand2);
if (!p->conf->stream_authentication) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: Error no authentication data");
goto InternalError;
}
h = strstr(p->conf->stream_authentication, ":");
if (!h) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: Error no authentication data (no ':' found)");
goto InternalError;
}
server_user = (char*)malloc((h - p->conf->stream_authentication) + 1);
server_pass = (char*)malloc(strlen(h) + 1);
if (!server_user || !server_pass) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: Error malloc failed");
goto InternalError;
}
strncpy(server_user, p->conf->stream_authentication, h-p->conf->stream_authentication);
server_user[h - p->conf->stream_authentication] = '\0';
strncpy(server_pass, h + 1, strlen(h + 1));
server_pass[strlen(h + 1)] = '\0';
while(1) {
if(!read_http_request(p->sock, buffer, length, server_uri, SERVER_URI_LEN - 1))
goto Invalid_Request;
auth = strstr(buffer, "Authorization: Digest");
if(!auth)
goto Error;
auth += sizeof("Authorization: Digest");
h = strstr(auth, "\r\n");
if (!h)
goto Error;
*h = '\0';
// Username
h=strstr(auth, "username=\"");
if (!h)
goto Error;
username = h + 10;
h = strstr(username + 1, "\"");
if (!h)
goto Error;
username_len = h - username;
// Realm
h = strstr(auth, "realm=\"");
if (!h)
goto Error;
realm = h + 7;
h = strstr(realm + 1, "\"");
if (!h)
goto Error;
realm_len = h - realm;
// URI
h = strstr(auth, "uri=\"");
if (!h)
goto Error;
uri = h + 5;
h = strstr(uri + 1, "\"");
if (!h)
goto Error;
uri_len = h - uri;
// Nonce
h = strstr(auth, "nonce=\"");
if (!h)
goto Error;
nonce = h + 7;
h = strstr(nonce + 1, "\"");
if (!h)
goto Error;
nonce_len = h - nonce;
// Response
h = strstr(auth, "response=\"");
if (!h)
goto Error;
response = h + 10;
h = strstr(response + 1, "\"");
if (!h)
goto Error;
response_len = h - response;
username[username_len] = '\0';
realm[realm_len] = '\0';
uri[uri_len] = '\0';
nonce[nonce_len] = '\0';
response[response_len] = '\0';
DigestCalcHA1((char*)"md5", server_user, (char*)STREAM_REALM, server_pass, (char*)server_nonce, (char*)NULL, HA1);
DigestCalcResponse(HA1, server_nonce, NULL, NULL, (char*)"", (char*)"GET", server_uri, HA2, server_response);
if (strcmp(server_response, response) == 0)
break;
Error:
rand1 = (unsigned int)(42000000.0 * rand() / (RAND_MAX + 1.0));
rand2 = (unsigned int)(42000000.0 * rand() / (RAND_MAX + 1.0));
snprintf(server_nonce, SERVER_NONCE_LEN, "%08x%08x", rand1, rand2);
snprintf(buffer, length, "%s realm=\""STREAM_REALM"\", nonce=\"%s\"\r\n"
"Content-Type: text/html\r\n"
"Keep-Alive: timeout=%i\r\n"
"Connection: keep-alive\r\n"
"Content-Length: %zu\r\n\r\n",
request_auth_response_template, server_nonce,
KEEP_ALIVE_TIMEOUT, strlen(auth_failed_html_template));
if (write(p->sock, buffer, strlen(buffer)) < 0)
MOTION_LOG(DBG, TYPE_STREAM, SHOW_ERRNO, "%s: write failure 1:handle_md5_digest");
if (write(p->sock, auth_failed_html_template, strlen(auth_failed_html_template)) < 0)
MOTION_LOG(DBG, TYPE_STREAM, SHOW_ERRNO, "%s: write failure 2:handle_md5_digest");
}
// OK - Access
/* Set socket to non blocking */
if (fcntl(p->sock, F_SETFL, p->sock_flags) < 0) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: fcntl");
goto Error;
}
free(server_user);
free(server_pass);
/* Lock the mutex */
pthread_mutex_lock(&stream_auth_mutex);
stream_add_client(&p->cnt->stream, p->sock);
p->cnt->stream_count++;
p->thread_count--;
/* Unlock the mutex */
pthread_mutex_unlock(&stream_auth_mutex);
free(p);
pthread_exit(NULL);
InternalError:
free(server_user);
free(server_pass);
if (write(p->sock, internal_error_template, strlen(internal_error_template)) < 0)
MOTION_LOG(DBG, TYPE_STREAM, SHOW_ERRNO, "%s: write failure 3:handle_md5_digest");
Invalid_Request:
close(p->sock);
pthread_mutex_lock(&stream_auth_mutex);
p->thread_count--;
pthread_mutex_unlock(&stream_auth_mutex);
free(p);
pthread_exit(NULL);
}
/**
* do_client_auth
*
*
*/
static void do_client_auth(struct context *cnt, int sc)
{
pthread_t thread_id;
pthread_attr_t attr;
auth_handler handle_func;
struct auth_param* handle_param = NULL;
int flags;
static int first_call = 0;
static int thread_count = 0;
if(first_call == 0) {
first_call = 1;
/* Initialize the mutex */
pthread_mutex_init(&stream_auth_mutex, NULL);
}
switch(cnt->conf.stream_auth_method)
{
case 1: // Basic
handle_func = handle_basic_auth;
break;
case 2: // MD5 Digest
handle_func = handle_md5_digest;
break;
default:
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: Error unknown stream authentication method");
goto Error;
break;
}
handle_param = mymalloc(sizeof(struct auth_param));
handle_param->cnt = cnt;
handle_param->sock = sc;
handle_param->conf = &cnt->conf;
handle_param->thread_count = &thread_count;
/* Set socket to blocking */
if ((flags = fcntl(sc, F_GETFL, 0)) < 0) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: fcntl");
goto Error;
}
handle_param->sock_flags = flags;
if (fcntl(sc, F_SETFL, flags & (~O_NONBLOCK)) < 0) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: fcntl");
goto Error;
}
if (thread_count >= DEF_MAXSTREAMS)
goto Error;
if (pthread_attr_init(&attr)) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: Error pthread_attr_init");
goto Error;
}
if (pthread_create(&thread_id, &attr, handle_func, handle_param)) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: Error pthread_create");
goto Error;
}
pthread_detach(thread_id);
if (pthread_attr_destroy(&attr))
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: Error pthread_attr_destroy");
return;
Error:
close(sc);
free(handle_param);
}
/**
* http_bindsock
* Sets up a TCP/IP socket for incoming requests. It is called only during
* initialisation of Motion from the function stream_init
* The function sets up a a socket on the port number given by _port_.
* If the parameter _local_ is not zero the socket is setup to only accept connects from localhost.
* Otherwise any client IP address is accepted. The function returns an integer representing the socket.
*
* Returns: socket descriptor or -1 if any error happens
*/
int http_bindsock(int port, int local, int ipv6_enabled)
{
int sd = socket(ipv6_enabled?AF_INET6:AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sd == -1)
{
MOTION_LOG(CRT, TYPE_STREAM, SHOW_ERRNO, "%s: error creating socket");
return -1;
}
int yes = 1, no = 0;
if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) != 0)
{
MOTION_LOG(CRT, TYPE_STREAM, SHOW_ERRNO, "%s: setting SO_REUSEADDR to yes failed");
/* we can carry on even if this failed */
}
if (ipv6_enabled)
{
if (setsockopt(sd, IPPROTO_IPV6, IPV6_V6ONLY, &no, sizeof(no)) != 0)
{
MOTION_LOG(CRT, TYPE_STREAM, SHOW_ERRNO, "%s: setting IPV6_V6ONLY to no failed");
/* we can carry on even if this failed */
}
}
const char *addr_str;
struct sockaddr_storage sin;
socklen_t sinsize;
bzero(&sin, sizeof(struct sockaddr_storage));
sin.ss_family = ipv6_enabled?AF_INET6:AF_INET;
if (ipv6_enabled) {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&sin;
sin6->sin6_family = AF_INET6;
sin6->sin6_port = htons(port);
if(local) {
addr_str = "::1";
sin6->sin6_addr = in6addr_loopback;
} else {
addr_str = "any IPv4/IPv6 address";
sin6->sin6_addr = in6addr_any;
}
sinsize = sizeof(*sin6);
} else {
struct sockaddr_in *sin4 = (struct sockaddr_in*)&sin;
sin4->sin_family = AF_INET;
sin4->sin_port = htons(port);
if(local) {
addr_str = "127.0.0.1";
sin4->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
} else {
addr_str = "any IPv4 address";
sin4->sin_addr.s_addr = htonl(INADDR_ANY);
}
sinsize = sizeof(*sin4);
}
if (bind(sd, (struct sockaddr*)&sin, sinsize) != 0) {
MOTION_LOG(CRT, TYPE_STREAM, SHOW_ERRNO, "%s: error binding on %s port %d", addr_str, port);
close(sd);
return -1;
}
if (listen(sd, DEF_MAXWEBQUEUE) != 0) {
MOTION_LOG(CRT, TYPE_STREAM, SHOW_ERRNO, "%s: error listening");
close(sd);
return -1;
}
MOTION_LOG(NTC, TYPE_STREAM, NO_ERRNO, "%s: listening on %s port %d", addr_str, port);
return sd;
}
/**
* http_acceptsock
*
*
* Returns: socket descriptor or -1 if any error happens.
*/
static int http_acceptsock(int sl)
{
int sc;
struct sockaddr_storage addr;
socklen_t addr_len = sizeof(addr);
sc = accept(sl, (struct sockaddr*)&addr, &addr_len);
if (sc < 0) {
MOTION_LOG(CRT, TYPE_STREAM, SHOW_ERRNO, "%s: motion-stream accept()");
return -1;
}
unsigned long i = 1;
ioctl(sc, FIONBIO, &i);
return sc;
}
/**
* stream_flush
* Sends any outstanding data to all connected clients.
* It continuously goes through the client list until no data is able
* to be sent (either because there isn't any, or because the clients
* are not able to accept it).
*/
static void stream_flush(struct stream *list, int *stream_count, int lim)
{
int written; /* The number of bytes actually written. */
struct stream *client; /* Pointer to the client being served. */
int workdone = 0; /* Flag set any time data is successfully
written. */
client = list->next;
while (client) {
/* If data waiting for client, try to send it. */
if (client->tmpbuffer) {
/*
* We expect that list->filepos < list->tmpbuffer->size
* should always be true. The check is more for safety,
* in case of trouble is some other part of the code.
* Note that if it is false, the following section will
* clean up.
*/
if (client->filepos < client->tmpbuffer->size) {
/*
* Here we are finally ready to write out the
* data. Remember that (because the socket
* has been set non-blocking) we may only
* write out part of the buffer. The var
* 'filepos' contains how much of the buffer
* has already been written.
*/
written = write(client->socket,
client->tmpbuffer->ptr + client->filepos,
client->tmpbuffer->size - client->filepos);
/*
* If any data has been written, update the
* data pointer and set the workdone flag.
*/
if (written > 0) {
client->filepos += written;
workdone = 1;
}
} else
written = 0;
/*
* If we have written the entire buffer to the socket,
* or if there was some error (other than EAGAIN, which
* means the system couldn't take it), this request is
* finished.
*/
if ((client->filepos >= client->tmpbuffer->size) ||
(written < 0 && errno != EAGAIN)) {
/* If no other clients need this buffer, free it. */
if (--client->tmpbuffer->ref <= 0) {
free(client->tmpbuffer->ptr);
free(client->tmpbuffer);
}
/* Mark this client's buffer as empty. */
client->tmpbuffer = NULL;
client->nr++;
}
/*
* If the client is no longer connected, or the total
* number of frames already sent to this client is
* greater than our configuration limit, disconnect
* the client and free the stream struct.
*/
if ((written < 0 && errno != EAGAIN) ||
(lim && !client->tmpbuffer && client->nr > lim)) {
void *tmp;
close(client->socket);
if (client->next)
client->next->prev = client->prev;
client->prev->next = client->next;
tmp = client;
client = client->prev;
free(tmp);
(*stream_count)--;
}
} /* End if (client->tmpbuffer) */
/*
* Step the the next client in the list. If we get to the
* end of the list, check if anything was written during
* that loop; (if so) reset the 'workdone' flag and go back
* to the beginning.
*/
client = client->next;
if (!client && workdone) {
client = list->next;
workdone = 0;
}
} /* End while (client) */
}
/**
* stream_tmpbuffer
* Routine to create a new "tmpbuffer", which is a common
* object used by all clients connected to a single camera.
*
* Returns: new allocated stream_buffer.
*/
static struct stream_buffer *stream_tmpbuffer(int size)
{
struct stream_buffer *tmpbuffer = mymalloc(sizeof(struct stream_buffer));
tmpbuffer->ref = 0;
tmpbuffer->ptr = mymalloc(size);
return tmpbuffer;
}
/**
* stream_add_client
*
*
*/
static void stream_add_client(struct stream *list, int sc)
{
struct stream *new = mymalloc(sizeof(struct stream));
static const char header[] = "HTTP/1.0 200 OK\r\n"
"Server: Motion/"VERSION"\r\n"
"Connection: close\r\n"
"Max-Age: 0\r\n"
"Expires: 0\r\n"
"Cache-Control: no-cache, private\r\n"
"Pragma: no-cache\r\n"
"Content-Type: multipart/x-mixed-replace; "
"boundary=BoundaryString\r\n\r\n";
memset(new, 0, sizeof(struct stream));
new->socket = sc;
if ((new->tmpbuffer = stream_tmpbuffer(sizeof(header))) == NULL) {
MOTION_LOG(ERR, TYPE_STREAM, SHOW_ERRNO, "%s: Error creating tmpbuffer in stream_add_client");
} else {
memcpy(new->tmpbuffer->ptr, header, sizeof(header)-1);
new->tmpbuffer->size = sizeof(header)-1;
}
new->prev = list;
new->next = list->next;
if (new->next)
new->next->prev = new;
list->next = new;
}
/**
* stream_add_write
*
*
*/
static void stream_add_write(struct stream *list, struct stream_buffer *tmpbuffer, unsigned int fps)
{
struct timeval curtimeval;
unsigned long int curtime;
gettimeofday(&curtimeval, NULL);
curtime = curtimeval.tv_usec + 1000000L * curtimeval.tv_sec;
while (list->next) {
list = list->next;
if (list->tmpbuffer == NULL && ((curtime - list->last) >= 1000000L / fps)) {
list->last = curtime;
list->tmpbuffer = tmpbuffer;
tmpbuffer->ref++;
list->filepos = 0;
}
}
if (tmpbuffer->ref <= 0) {
free(tmpbuffer->ptr);