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netcam_http.c
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netcam_http.c
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/***********************************************************
* netcam_http.c
* Process network camera images using http protocol
* This code was inspired by the original netcam.c module
* written by Jeroen Vreeken and enhanced by several Motion
* project contributors, particularly Angel Carpintero and
* Christopher Price.
*
* Copyright 2005, William M. Brack
* This software is distributed under the GNU Public license
* Version 2. See also the file 'COPYING'.
***********************************************************/
#include "translate.h"
#include "motion.h" /* Needs to come first, because _GNU_SOURCE_ set there. */
#include "netcam_http.h"
#define CONNECT_TIMEOUT 10 /* Timeout on remote connection attempt */
#define READ_TIMEOUT 5 /* Default timeout on recv requests */
#define POLLING_TIMEOUT READ_TIMEOUT /* File polling timeout [s] */
#define POLLING_TIME 500*1000*1000 /* File polling time quantum [ns] (500ms) */
#define MAX_HEADER_RETRIES 5 /* Max tries to find a header record */
#define MINVAL(x, y) ((x) < (y) ? (x) : (y))
/* These strings are used for the HTTP connection. */
static const char *connect_req;
static const char *connect_req_http10 = "GET %s HTTP/1.0\r\n"
"Host: %s\r\n"
"User-Agent: Motion-netcam/" VERSION "\r\n";
static const char *connect_req_http11 = "GET %s HTTP/1.1\r\n"
"Host: %s\r\n"
"User-Agent: Motion-netcam/" VERSION "\r\n";
static const char *connect_req_close = "Connection: close\r\n";
static const char *connect_req_keepalive = "Connection: Keep-Alive\r\n";
static const char *connect_auth_req = "Authorization: Basic %s\r\n";
tfile_context *file_new_context(void);
void file_free_context(tfile_context* ctxt);
/**
* check_quote
*
* Checks a string to see if it's quoted, and if so removes the
* quotes.
*
* Parameters:
*
* str Pointer to a string.
*
* Returns: Nothing, but updates the target if necessary.
*
*/
static void check_quote(char *str)
{
int len;
char ch;
ch = *str;
if ((ch == '"') || (ch == '\'')) {
len = strlen(str) - 1;
if (str[len] == ch) {
memmove(str, str+1, len-1);
str[len-1] = 0;
}
}
}
/**
* netcam_check_content_length
*
* Analyse an HTTP-header line to see if it is a Content-length.
*
* Parameters:
*
* header Pointer to a string containing the header line.
*
* Returns:
* -1 Not a Content-length line.
* >=0 Value of Content-length field.
*
*/
static long netcam_check_content_length(char *header)
{
long length = -1; /* Note this is a long, not an int. */
if (!header_process(header, "Content-Length", header_extract_number, &length)) {
/*
* Some netcams deliver some bad-format data, but if
* we were able to recognize the header section and the
* number we might as well try to use it.
*/
if (length > 0)
MOTION_LOG(WRN, TYPE_NETCAM, NO_ERRNO
,_("malformed token Content-Length but value %ld"), length);
}
MOTION_LOG(DBG, TYPE_NETCAM, NO_ERRNO,_("Content-Length %ld"), length);
return length;
}
/**
* netcam_check_keepalive
*
* Analyse an HTTP-header line to see if it is a Keep-Alive.
*
* Parameters:
*
* header Pointer to a string containing the header line.
*
* Returns:
* -1 Not a Keep-Alive line.
* 1 Is a Keep-Alive line.
*
*/
static int netcam_check_keepalive(char *header)
{
char *content_type = NULL;
if (!header_process(header, "Keep-Alive", http_process_type, &content_type))
return -1;
/* We do not detect the second field or other case mixes at present. */
free(content_type);
return 1;
}
/**
* netcam_check_close
*
* Analyse an HTTP-header line to see if it is a Connection: close.
*
* Parameters:
*
* header Pointer to a string containing the header line.
*
* Returns:
* -1 Not a Connection: close.
* 1 Is a Connection: close.
*
*/
static int netcam_check_close(char *header)
{
char *type = NULL;
int ret = -1;
if (!header_process(header, "Connection", http_process_type, &type))
return -1;
if (!strcmp(type, "close")) /* strcmp returns 0 for match. */
ret = 1;
free(type);
return ret;
}
/**
* netcam_check_content_type
*
* Analyse an HTTP-header line to see if it is a Content-type.
*
* Parameters:
*
* header Pointer to a string containing the header line.
*
* Returns:
* -1 Not a Content-type line
* 0 Content-type not recognized
* 1 image/jpeg
* 2 multipart/x-mixed-replace or multipart/mixed
* 3 application/octet-stream (used by WVC200 Linksys IP Camera)
*
*/
static int netcam_check_content_type(char *header)
{
char *content_type = NULL;
int ret;
if (!header_process(header, "Content-type", http_process_type, &content_type))
return -1;
MOTION_LOG(DBG, TYPE_NETCAM, NO_ERRNO,_("Content-type %s"), content_type);
if (!strcmp(content_type, "image/jpeg")) {
ret = 1;
} else if (!strcmp(content_type, "multipart/x-mixed-replace") ||
!strcmp(content_type, "multipart/mixed")) {
ret = 2;
} else if (!strcmp(content_type, "application/octet-stream")) {
ret = 3;
} else {
ret = 0;
}
free(content_type);
return ret;
}
/**
* netcam_read_next_header
*
* Read the next header record from the camera.
*
* Parameters
*
* netcam pointer to a netcam_context.
*
* Returns: 0 for success, -1 if any error.
*
*/
int netcam_read_next_header(netcam_context_ptr netcam)
{
int retval;
char *header;
/* Return if not connected */
if (netcam->sock == -1)
return -1;
/*
* We are expecting a header which *must* contain a mime-type of
* image/jpeg, and *might* contain a Content-Length.
*
* If this is a "streaming" camera, the header *must* be preceded
* by a "boundary" string.
*
*/
netcam->caps.content_length = 0;
/*
* If this is a "streaming" camera, the stream header must be
* preceded by a "boundary" string.
*/
if (netcam->caps.streaming == NCS_MULTIPART) {
while (1) {
retval = header_get(netcam, &header, HG_NONE);
if (retval != HG_OK) {
/* Header reported as not-OK, check to see if it's null. */
if (strlen(header) == 0) {
MOTION_LOG(WRN, TYPE_NETCAM, NO_ERRNO
,_("Error reading image header, streaming mode (1). Null header."));
} else {
/* Header is not null. Output it in case it's a new camera with unknown headers. */
MOTION_LOG(WRN, TYPE_NETCAM, NO_ERRNO
,_("Error reading image header, streaming mode (1). Unknown header '%s'")
,header);
}
free(header);
return -1;
}
retval = (strstr(header, netcam->boundary) == NULL);
free(header);
if (!retval)
break;
}
}
while (1) {
retval = header_get(netcam, &header, HG_NONE);
if (retval != HG_OK) {
MOTION_LOG(ERR, TYPE_NETCAM, NO_ERRNO,_("Error reading image header (2)"));
free(header);
return -1;
}
if (*header == 0)
break;
if ((retval = netcam_check_content_type(header)) >= 0) {
if (retval != 1) {
MOTION_LOG(ERR, TYPE_NETCAM, NO_ERRNO,_("Header not JPEG"));
free(header);
return -1;
}
}
if ((retval = (int) netcam_check_content_length(header)) >= 0) {
if (retval > 0) {
netcam->caps.content_length = 1; /* Set flag */
netcam->receiving->content_length = retval;
} else {
netcam->receiving->content_length = 0;
MOTION_LOG(ERR, TYPE_NETCAM, NO_ERRNO,_("Content-Length 0"));
free(header);
return -1;
}
}
free(header);
}
MOTION_LOG(DBG, TYPE_NETCAM, NO_ERRNO,_("Found image header record"));
free(header);
return 0;
}
/**
* netcam_read_first_header
*
* This routine attempts to read a header record from the netcam. If
* successful, it analyses the header to determine whether the camera is
* a "streaming" type. If it is, the routine looks for the Boundary-string;
* if found, it positions just past the string so that the image header can
* be read. It then reads the image header and continues processing that
* header as well.
*
* If the camera does not appear to be a streaming type, it is assumed that the
* header just read was the image header. It is processed to determine whether
* a Content-length is present.
*
* After this processing, the routine returns to the caller.
*
* Parameters:
* netcam Pointer to the netcam_context structure.
*
* Returns: Content-type code if successful, -1 if not
* -2 if Content-length = 0
*/
int netcam_read_first_header(netcam_context_ptr netcam)
{
int retval = -3; /* "Unknown err" */
int ret;
int firstflag = 1;
int aliveflag = 0; /* If we have seen a Keep-Alive header from cam. */
int closeflag = 0; /* If we have seen a Connection: close header from cam. */
char *header;
char *boundary;
/* Send the initial command to the camera. */
if (send(netcam->sock, netcam->connect_request,
strlen(netcam->connect_request), 0) < 0) {
MOTION_LOG(ERR, TYPE_NETCAM, SHOW_ERRNO
,_("Error sending 'connect' request"));
return -1;
}
/*
* We expect to get back an HTTP header from the camera.
* Successive calls to header_get will return each line
* of the header received. We will continue reading until
* a blank line is received.
*
* As we process the header, we are looking for either of
* header lines Content-type or Content-length. Content-type
* is used to determine whether the camera is "streaming" or
* "non-streaming", and Content-length will be used to determine
* whether future reads of images will be controlled by the
* length specified before the image, or by a boundary string.
*
* The Content-length will only be present "just before" an
* image is sent (if it is present at all). That means that, if
* this is a "streaming" camera, it will not be present in the
* "first header", but will occur later (after a boundary-string).
* For a non-streaming camera, however, there is no boundary-string,
* and the first header is, in fact, the only header. In this case,
* there may be a Content-length.
*
*/
while (1) { /* 'Do forever' */
ret = header_get(netcam, &header, HG_NONE);
MOTION_LOG(DBG, TYPE_NETCAM, NO_ERRNO,_("Received first header ('%s')"), header);
if (ret != HG_OK) {
MOTION_LOG(WRN, TYPE_NETCAM, NO_ERRNO
,_("Error reading first header (%s)"), header);
free(header);
return -1;
}
if (firstflag) {
if ((ret = http_result_code(header)) != 200) {
MOTION_LOG(DBG, TYPE_NETCAM, NO_ERRNO,_("HTTP Result code %d"), ret);
free(header);
if (netcam->connect_keepalive) {
/*
* Cannot unset netcam->cnt->conf.netcam_keepalive as it is assigned const
* But we do unset the netcam keepalive flag which was set in netcam_start
* This message is logged as Information as it would be useful to know
* if your netcam often returns bad HTTP result codes.
*/
netcam->connect_keepalive = FALSE;
free((void *)netcam->cnt->conf.netcam_keepalive);
netcam->cnt->conf.netcam_keepalive = strdup("off");
MOTION_LOG(NTC, TYPE_NETCAM, NO_ERRNO
,_("Removed netcam Keep-Alive flag "
"due to apparent closed HTTP connection."));
}
return ret;
}
firstflag = 0;
free(header);
continue;
}
if (*header == 0) /* Blank line received */
break;
/* Check if this line is the content type. */
if ((ret = netcam_check_content_type(header)) >= 0) {
retval = ret;
/*
* We are expecting to find one of three types:
* 'multipart/x-mixed-replace', 'multipart/mixed'
* or 'image/jpeg'. The first two will be received
* from a streaming camera, and the third from a
* camera which provides a single frame only.
*/
switch (ret) {
case 1: /* Not streaming */
if (netcam->connect_keepalive)
MOTION_LOG(NTC, TYPE_NETCAM, NO_ERRNO
,_("Non-streaming camera (keep-alive set)"));
else
MOTION_LOG(NTC, TYPE_NETCAM, NO_ERRNO
,_("Non-streaming camera (keep-alive not set)"));
netcam->caps.streaming = NCS_UNSUPPORTED;
break;
case 2: /* Streaming */
MOTION_LOG(DBG, TYPE_NETCAM, NO_ERRNO,_("Streaming camera"));
netcam->caps.streaming = NCS_MULTIPART;
if ((boundary = strstr(header, "boundary="))) {
/* On error recovery this may already be set. */
free(netcam->boundary);
netcam->boundary = mystrdup(boundary + 9);
/*
* HTTP protocol apparently permits the boundary string
* to be quoted (the Lumenera does this, which caused
* trouble) so we need to get rid of any surrounding
* quotes.
*/
check_quote(netcam->boundary);
netcam->boundary_length = strlen(netcam->boundary);
MOTION_LOG(DBG, TYPE_NETCAM, NO_ERRNO
,_("Boundary string [%s]"), netcam->boundary);
} else {
MOTION_LOG(NTC, TYPE_NETCAM, NO_ERRNO
,_("Boundary string not found in header"));
free(header);
return -1;
}
break;
case 3: /* MJPG-Block style streaming. */
MOTION_LOG(NTC, TYPE_NETCAM, NO_ERRNO
,_("Streaming camera probably using MJPG-blocks,"
" consider using mjpg:// netcam_url."));
break;
default:
/* Error */
MOTION_LOG(ERR, TYPE_NETCAM, NO_ERRNO,_("Unrecognized content type"));
free(header);
return -1;
}
} else if ((ret = (int) netcam_check_content_length(header)) >= 0) {
MOTION_LOG(NTC, TYPE_NETCAM, NO_ERRNO,_("Content-length present"));
if (ret > 0) {
netcam->caps.content_length = 1; /* Set flag */
netcam->receiving->content_length = ret;
} else {
netcam->receiving->content_length = 0;
MOTION_LOG(ERR, TYPE_NETCAM, NO_ERRNO,_("Content-length 0"));
retval = -2;
}
} else if (netcam_check_keepalive(header) == TRUE) {
/* Note that we have received a Keep-Alive header, and thus the socket can be left open. */
aliveflag = TRUE;
netcam->keepalive_thisconn = TRUE;
/*
* This flag will not be set when a Streaming cam is in use, but that
* does not matter as the test below looks at Streaming state also.
*/
} else if (netcam_check_close(header) == TRUE) {
/* Note that we have received a Connection: close header. */
closeflag = TRUE;
/*
* This flag is acted upon below.
* Changed criterion and moved up from below to catch headers that cause returns.
*/
MOTION_LOG(NTC, TYPE_NETCAM, NO_ERRNO
,_("Found Conn: close header ('%s')"), header);
}
free(header);
}
free(header);
if (netcam->caps.streaming == NCS_UNSUPPORTED && netcam->connect_keepalive) {
/* If we are a non-streaming (ie. Jpeg) netcam and keepalive is configured. */
if (aliveflag) {
if (closeflag) {
netcam->warning_count++;
if (netcam->warning_count > 3) {
netcam->warning_count = 0;
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("Both 'Connection: Keep-Alive' and "
"'Connection: close' header received. Motion removes keepalive."));
netcam->connect_keepalive = FALSE;
free((void *)netcam->cnt->conf.netcam_keepalive);
netcam->cnt->conf.netcam_keepalive = strdup("off");
} else {
/*
* If not a streaming cam, and keepalive is set, and the flag shows we
* did not see a Keep-Alive field returned from netcam and a Close field.
* Not quite sure what the correct course of action is here. In for testing.
*/
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("Both 'Connection: Keep-Alive' and "
"'Connection: close' header received. Motion continues unchanged."));
}
} else {
/*
* aliveflag && !closeflag
*
* If not a streaming cam, and keepalive is set, and the flag shows we
* just got a Keep-Alive field returned from netcam and no Close field.
* No action, as this is the normal case. In debug we print a notification.
*/
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("Received a Keep-Alive field in this set of headers."));
}
} else { /* !aliveflag */
if (!closeflag) {
netcam->warning_count++;
if (netcam->warning_count > 3) {
netcam->warning_count = 0;
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("No 'Connection: Keep-Alive' nor 'Connection: close'"
" header received.\n Motion removes keepalive."));
netcam->connect_keepalive = FALSE;
free((void *)netcam->cnt->conf.netcam_keepalive);
netcam->cnt->conf.netcam_keepalive = strdup("off");
} else {
/*
* If not a streaming cam, and keepalive is set, and the flag shows we
* did not see a Keep-Alive field returned from netcam nor a Close field.
* Not quite sure what the correct course of action is here. In for testing.
*/
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("No 'Connection: Keep-Alive' nor 'Connection: close'"
" header received.\n Motion continues unchanged."));
}
} else {
/*
* !aliveflag & closeflag
* If not a streaming cam, and keepalive is set, and the flag shows we
* received a 'Connection: close' field returned from netcam. It is not likely
* we will get a Keep-Alive and Close header together - this is picked up by
* the test code above.
* If we receive a Close header, then we want to cease keep-alive for this cam.
* This situation will occur in 2 situations:
* (a) in HTTP 1.1 when the client wants to stop the keep-alive
* (and in this case it would be correct to close connection and then
* make a new one, with keep-alive set again).
* (b) in HTTP 1.0 with keepalive, when the client does not support it.
* In this case we should not attempt to re-start Keep-Alive.
* Due to that, we accept a Connection: close header in HTTP 1.0 & 1.1 modes
*
* To tell between the sitation where a camera has been in Keep-Alive mode and
* is now finishing (and will want to be re-started in Keep-Alive) and the other
* case when a cam does not support it, we have a flag which says if the netcam
* has returned a Keep-Alive flag during this connection. If that's set, we
* set ourselves up to re-connect with Keep-Alive after the socket is closed.
* If it's not set, then we will not try again to use Keep-Alive.
*/
if (!netcam->keepalive_thisconn) {
netcam->connect_keepalive = FALSE; /* No further attempts at keep-alive */
free((void *)netcam->cnt->conf.netcam_keepalive);
netcam->cnt->conf.netcam_keepalive = strdup("off");
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("Removed netcam Keep-Alive flag because"
" 'Connection: close' header received.\n Netcam does not support "
"Keep-Alive. Motion continues in non-Keep-Alive."));
} else {
netcam->keepalive_timeup = TRUE; /* We will close and re-open keep-alive */
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("Keep-Alive has reached end of valid period.\n"
"Motion will close netcam, then resume Keep-Alive with a new socket."));
}
}
}
}
return retval;
}
/**
* netcam_disconnect
*
* Disconnect from the network camera.
*
* Parameters:
*
* netcam pointer to netcam context
*
* Returns: Nothing
*
*/
void netcam_disconnect(netcam_context_ptr netcam)
{
if (netcam->sock > 0) {
if (close(netcam->sock) < 0)
MOTION_LOG(ERR, TYPE_NETCAM, SHOW_ERRNO, _("disconnect"));
netcam->sock = -1;
}
}
/**
* netcam_connect
*
* Attempt to open the network camera as a stream device.
* Keep-alive is supported, ie. if netcam->connect_keepalive is TRUE, we
* re-use netcam->sock unless it has value -1, meaning it is invalid.
*
* Parameters:
*
* netcam pointer to netcam_context structure
* err_flag flag to suppress error printout (1 => suppress)
* Note that errors which indicate something other than
* a network connection problem are not suppressed.
*
* Returns: 0 for success, -1 for error
*
*/
int netcam_connect(netcam_context_ptr netcam, int err_flag)
{
struct addrinfo *ai;
int ret;
int saveflags;
int back_err;
int optval;
socklen_t optlen = sizeof(optval);
socklen_t len;
fd_set fd_w;
struct timeval selecttime;
char port[15];
sprintf(port,"%u",netcam->connect_port);
/* Lookup the hostname given in the netcam URL. */
if ((ret = getaddrinfo(netcam->connect_host, port, NULL, &ai)) != 0) {
if (!err_flag)
MOTION_LOG(ERR, TYPE_NETCAM, NO_ERRNO
,_("getaddrinfo() failed (%s): %s")
,netcam->connect_host, gai_strerror(ret));
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO,_("disconnecting netcam (1)"));
netcam_disconnect(netcam);
return -1;
}
/* Assure any previous connection has been closed - IF we are not in keepalive. */
if (!netcam->connect_keepalive) {
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("disconnecting netcam since keep-alive not set."));
netcam_disconnect(netcam);
/* Create a new socket. */
if ((netcam->sock = socket(ai->ai_family, SOCK_STREAM, 0)) < 0) {
MOTION_LOG(WRN, TYPE_NETCAM, SHOW_ERRNO
,_("with no keepalive, attempt to create socket failed."));
return -1;
}
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("with no keepalive, new socket created fd %d"), netcam->sock);
} else if (netcam->sock == -1) { /* We are in keepalive mode, check for invalid socket. */
/* Must be first time, or closed, create a new socket. */
if ((netcam->sock = socket(ai->ai_family, SOCK_STREAM, 0)) < 0) {
MOTION_LOG(WRN, TYPE_NETCAM, SHOW_ERRNO
,_("with keepalive set, invalid socket."
"This could be the first time. Creating a new one failed."));
return -1;
}
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("with keepalive set, invalid socket."
"This could be first time, created a new one with fd %d")
,netcam->sock);
/* Record that this connection has not yet received a Keep-Alive header. */
netcam->keepalive_thisconn = FALSE;
/* Check the socket status for the keepalive option. */
if (getsockopt(netcam->sock, SOL_SOCKET, SO_KEEPALIVE, &optval, &optlen) < 0) {
MOTION_LOG(ERR, TYPE_NETCAM, SHOW_ERRNO, "getsockopt()");
return -1;
}
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("SO_KEEPALIVE is %s")
,optval ? _("ON"):_("OFF"));
/* Set the option active. */
optval = 1;
optlen = sizeof(optval);
if (setsockopt(netcam->sock, SOL_SOCKET, SO_KEEPALIVE, &optval, optlen) < 0) {
MOTION_LOG(ERR, TYPE_NETCAM, SHOW_ERRNO, "setsockopt()");
return -1;
}
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO, _("SO_KEEPALIVE set on socket."));
}
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO
,_("re-using socket %d since keepalive is set."), netcam->sock);
/*
* We set the socket non-blocking and then use a 'select'
* system call to control the timeout.
*/
if ((saveflags = fcntl(netcam->sock, F_GETFL, 0)) < 0) {
MOTION_LOG(ERR, TYPE_NETCAM, SHOW_ERRNO, _("fcntl(1) on socket"));
netcam_disconnect(netcam);
return -1;
}
/* Set the socket non-blocking. */
if (fcntl(netcam->sock, F_SETFL, saveflags | O_NONBLOCK) < 0) {
MOTION_LOG(ERR, TYPE_NETCAM, SHOW_ERRNO,_("fcntl(2) on socket"));
netcam_disconnect(netcam);
return -1;
}
/* Now the connect call will return immediately. */
ret = connect(netcam->sock, ai->ai_addr, ai->ai_addrlen);
back_err = errno; /* Save the errno from connect */
freeaddrinfo(ai);
/* If the connect failed with anything except EINPROGRESS, error. */
if ((ret < 0) && (back_err != EINPROGRESS)) {
if (!err_flag)
MOTION_LOG(ERR, TYPE_NETCAM, SHOW_ERRNO
,_("connect() failed (%d)"), back_err);
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO,_("disconnecting netcam (4)"));
netcam_disconnect(netcam);
return -1;
}
/* Now we do a 'select' with timeout to wait for the connect. */
FD_ZERO(&fd_w);
FD_SET(netcam->sock, &fd_w);
selecttime.tv_sec = CONNECT_TIMEOUT;
selecttime.tv_usec = 0;
ret = select(FD_SETSIZE, NULL, &fd_w, NULL, &selecttime);
if (ret == 0) { /* 0 means timeout. */
if (!err_flag)
MOTION_LOG(ERR, TYPE_NETCAM, NO_ERRNO, _("timeout on connect()"));
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO,_("disconnecting netcam (2)"));
netcam_disconnect(netcam);
return -1;
}
/*
* A +ve value returned from the select (actually, it must be a
* '1' showing 1 fd's changed) shows the select has completed.
* Now we must check the return code from the select.
*/
len = sizeof(ret);
if (getsockopt(netcam->sock, SOL_SOCKET, SO_ERROR, &ret, &len) < 0) {
MOTION_LOG(ERR, TYPE_NETCAM, NO_ERRNO, _("getsockopt after connect"));
netcam_disconnect(netcam);
return -1;
}
/* If the return code is anything except 0, error on connect. */
if (ret) {
if (!err_flag)
MOTION_LOG(ERR, TYPE_NETCAM, SHOW_ERRNO, _("connect returned error"));
MOTION_LOG(INF, TYPE_NETCAM, NO_ERRNO,_("disconnecting netcam (3)"));
netcam_disconnect(netcam);
return -1;
}
/* The socket info is stored in the rbuf structure of our context. */
rbuf_initialize(netcam);
return 0; /* Success */
}
void netcam_check_buffsize(netcam_buff_ptr buff, size_t numbytes)
{
int min_size_to_alloc;
int real_alloc;
int new_size;
if ((buff->size - buff->used) >= numbytes)
return;
min_size_to_alloc = numbytes - (buff->size - buff->used);
real_alloc = ((min_size_to_alloc / NETCAM_BUFFSIZE) * NETCAM_BUFFSIZE);
if ((min_size_to_alloc - real_alloc) > 0)
real_alloc += NETCAM_BUFFSIZE;
new_size = buff->size + real_alloc;
MOTION_LOG(DBG, TYPE_NETCAM, NO_ERRNO
,_("expanding buffer from [%d/%d] to [%d/%d] bytes.")
,(int) buff->used, (int) buff->size
,(int) buff->used, new_size);
buff->ptr = myrealloc(buff->ptr, new_size,
"netcam_check_buf_size");
buff->size = new_size;
}
/**
* Publish new image
*
* Moves the image in 'receiving' into 'latest' and updates last frame time
*/
void netcam_image_read_complete(netcam_context_ptr netcam)
{
struct timeval curtime;
netcam_buff *xchg;
if (gettimeofday(&curtime, NULL) < 0)
MOTION_LOG(WRN, TYPE_NETCAM, SHOW_ERRNO, "gettimeofday");
netcam->receiving->image_time = curtime;
/*
* Calculate our "running average" time for this netcam's
* frame transmissions (except for the first time).
* Note that the average frame time is held in microseconds.
*/
if (netcam->last_image.tv_sec) {
netcam->av_frame_time = ((9.0 * netcam->av_frame_time) + 1000000.0 *
(curtime.tv_sec - netcam->last_image.tv_sec) +
(curtime.tv_usec- netcam->last_image.tv_usec)) / 10.0;
/* The following floods the log. Comment out until it is needed. */
//MOTION_LOG(DBG, TYPE_NETCAM, NO_ERRNO, "Calculated frame time %f", netcam->av_frame_time);
}
netcam->last_image = curtime;
/*
* read is complete - set the current 'receiving' buffer atomically
* as 'latest', and make the buffer previously in 'latest' become
* the new 'receiving'.
*/
pthread_mutex_lock(&netcam->mutex);
xchg = netcam->latest;
netcam->latest = netcam->receiving;
netcam->receiving = xchg;
netcam->imgcnt++;
/*
* We have a new frame ready. We send a signal so that
* any thread (e.g. the motion main loop) waiting for the
* next frame to become available may proceed.
*/
pthread_cond_signal(&netcam->pic_ready);
pthread_mutex_unlock(&netcam->mutex);
}
/**
* netcam_read_html_jpeg
*
* This routine reads a jpeg image from the netcam. When it is called,
* the stream is already positioned just after the image header.
*
* This routine is called under the four variations of two different
* conditions:
* 1) Streaming or non-streaming camera
* Note: Keep-Alive is supported for non-streaming cameras,
* if enabled in the netcam's config structure.
* 2) Header does or does not include Content-Length
* Additionally, if it is a streaming camera, there must always be a
* boundary-string.
*
* The routine will (attempt to) read the JPEG image. If a Content-Length
* is present, it will be used (this will result in more efficient code, and
* also code which should be better at detecting and recovering from possible
* error conditions).
*
* If a boundary-string is present (and, if the camera is streaming, this
* *must* be the case), the routine will assure that it is recognized and
* acted upon.
*
* Our algorithm for this will be as follows:
* 1) If a Content-Length is present, set the variable "remaining"
* to be equal to that value, else set it to a "very large"
* number.
* WARNING !!! Content-Length *must* to be greater than 0, even more
* a jpeg image cannot be less than 300 bytes or so.
* 2) While there is more data available from the camera:
* a) If there is a "boundary string" specified (from the initial
* header):
* i) If the amount of data in the input buffer is less than
* the length of the boundary string, get more data into
* the input buffer (error if failure).
* ii) If the boundary string is found, check how many
* characters remain in the input buffer before the start
* of the boundary string. If that is less than the
* variable "remaining", reset "remaining" to be equal
* to that number.
* b) Try to copy up to "remaining" characters from the input
* buffer into our destination buffer.
* c) If there are no more characters available from the camera,
* exit this loop, else subtract the number of characters
* actually copied from the variable "remaining".
* 3) If Content-Length was present, and "remaining" is not equal
* to zero, generate a warning message for logging.
*
*
* Parameters:
* netcam Pointer to netcam context
*
*
* Returns: 0 for success, -1 for error
*
*/
static int netcam_read_html_jpeg(netcam_context_ptr netcam)
{
netcam_buff_ptr buffer;
size_t remaining; /* # characters to read */
size_t maxflush; /* # chars before boundary */
size_t rem, rlen, ix; /* Working vars */
int retval;
char *ptr, *bptr, *rptr;
/*
* Initialisation - set our local pointers to the context
* information.
*/
buffer = netcam->receiving;
/* Assure the target buffer is empty. */
buffer->used = 0;
/* Prepare for read loop. */
if (buffer->content_length != 0)
remaining = buffer->content_length;
else
remaining = 9999999;
/* Now read in the data. */
while (remaining) {
/* Assure data in input buffer. */
if (netcam->response->buffer_left <= 0) {
retval = rbuf_read_bufferful(netcam);
if (retval <= 0)
break;
netcam->response->buffer_left = retval;
netcam->response->buffer_pos = netcam->response->buffer;
}
/* If a boundary string is present, take it into account. */
bptr = netcam->boundary;
if (bptr) {
rptr = netcam->response->buffer_pos;
rlen = netcam->response->buffer_left;
/* Loop through buffer looking for start of boundary. */