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I am attempting to create a socket program which connects to Apple Push
Notification Service (APNS) and sends a push notification.
I am wondering if anyone can help me with the actual writing of the APNS
notification.
Below you can see my program which I used Scott Klement's Socket
Programming tutorial to help me with.
The code that is probably relevant to all of this is marked as 'APNS
Notification Format Begin', 'Initialize', and 'Formulate message to APNS'
in comments although I included the entire program for reference.
I have read the Provider Requirements on Apple's site Provider
Requirements but I am still having trouble getting everything working.
My program compiles and when I debug it / run through the steps I get past
establishing an actual connection so I 'think' that this part is OK.
What I am hoping is to get back an error identifier from Apple in the
variable errid within the item3 data structure. Apple states in the
Provider Requirements that they return a status code if there is an error
but that particular variable remains at 1077952576
There are also quite a few other things that I am unsure of
1) I have been given the device token as a Base64 string. The string is 40
some odd characters long but from what I understand, Apple states device
token length should be 32 bytes. In RPGLE doesn't 1 character represent 1
byte? If that's the case then I couldn't just declare my variable token as
D token 32a
because it would get cut off?
2) Is anyone able to tell me what I am doing wrong when it comes back to
receiving a proper error identifier from Apple in my variable errid?
Any help would be greatly appreciated
H DFTACTGRP(*NO) BNDDIR('QC2LE')
D/copy socket_h
D/copy gskssl_h
*==============================================================*
* APNS Notification Format Begin
*==============================================================*
D request s 1000a varying
D framehdr ds
D command 3I 0 inz(2)
D framelen 10I 0
D framedta s 500a varying
D item1 ds
D itemid1 3I 0 inz(1)
D itemlen1 5I 0 inz(%size(token))
D token 64a
D item2 ds
D itemid2 3I 0 inz(2)
D itemlen2 5I 0
D payload 100a varying
D item3 ds
D itemid3 3I 0 inz(3)
D itemlen3 5I 0 inz(%size(errid))
D errid 10I 0
D item4 ds
D itemid4 3I 0 inz(4)
D itemlen4 5I 0 inz(%size(expire))
D expire 10I 0 inz(0)
D item5 ds
D itemid5 3I 0 inz(5)
D itemlen5 5I 0 inz(%size(priority))
D priority 10I 0 inz(10)
*==============================================================*
* APNS Notification Format End
*==============================================================*
D gsk_strerror PR * extproc('gsk_strerror')
D gsk_ret_value 10I 0 value
D CreateEnv PR like(gsk_handle)
D ConnSock PR 10I 0
d host 256A const
D port 10I 0 value
D UpgradeSock PR like(gsk_handle)
D SslEnv like(gsk_handle) value
D sock 10I 0 value
D CloseSsl PR
D Handle like(gsk_handle) value
D CloseSslEnv PR
D SslEnv like(gsk_handle) value
D ReportError PR
D EscapeMsg PR
D errMsg s 80A varying
D CRLF c x'0d25'
D env s like(gsk_handle)
D s s 10I 0
D connto ds likeds(sockaddr_in)
D SslSock s like(gsk_handle)
D cmd s 400A
D len s 10I 0
D bytesSent s 10I 0
D Reply s 1000A
D bytesRead s 10I 0
D left s 10I 0
D buf s *
D received s 10I 0
D dataPos s 10I 0
D wait s 1A
D rc s 10I 0
/free
// Initialize
token = 'MyDevToken';
payload = '{"aps":{"alert":"You have mail"}}';
itemlen1 = %len(payload);
framedta = item1 + item2 + item3 + item4 + item5;
framelen = %len(framedta);
request = framehdr + framedta;
// Create SSL Environment
env = CreateEnv();
If (env = *NULL);
EscapeMsg();
Endif;
// Connect a socket to an SSL server (using normal socket calls)
// NOTE: Sandbox is the development environment
s = ConnSock('gateway.sandbox.push.apple.com': 2195);
// Upgrade the socket to SSL
SSLSock = UpgradeSock(env: s);
If (SSLSock = *NULL);
EscapeMsg();
Endif;
// **** Formulate message to APNS ******
len = %len(%trimr(request));
callp gsk_secure_soc_write(SSLSock
: %addr(request)
: len
: bytesSent);
// Close everything and end the program
CloseSsl(SslSock);
CloseSslEnv(Env);
*inlr = *on;
/end-free
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
* CreateEnv(): Create an SSL environment for client sockets
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
P CreateEnv B
D CreateEnv PI like(gsk_handle)
D rc s 10I 0
D SslEnv s like(Gsk_handle)
/free
// Create an SSL environment with default values:
rc = gsk_environment_open(SslEnv);
If (rc <> GSK_OK);
errMsg = %str(gsk_strerror(rc));
return *NULL;
Endif;
// Instruct environment to use the *SYSTEM certificate store
rc = gsk_attribute_set_buffer( SslEnv
: GSK_OS400_APPLICATION_ID
: 'SUMITOMO_APNS_PUSH'
:0 );
If (rc<>GSK_OK);
errMsg = %str(gsk_strerror(rc));
gsk_environment_close( SslEnv );
return *NULL;
Endif;
//Tell the environment that this is a client connection
rc = gsk_attribute_set_enum( SslEnv
: GSK_SESSION_TYPE
: GSK_CLIENT_SESSION );
If (rc <> GSK_OK);
errMsg = %str(gsk_strerror(rc));
gsk_environment_close( SslEnv );
return *NULL;
Endif;
// Activate the new environment
rc = gsk_environment_init( SslEnv );
If (rc <> GSK_OK);
errMsg = %str(gsk_strerror(rc));
gsk_environment_close( SslEnv );
return *NULL;
Endif;
return SslEnv;
/end-free
P E
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
* ConnSock(): Create a TCP Socket and connect to a host
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
P ConnSock B
D ConnSock PI 10I 0
d host 256A const
D port 10I 0 value
D s s 10I 0
D addr s 10U 0
/free
// look up host
addr = inet_addr(%trim(host));
If (addr = INADDR_NONE);
p_hostent = gethostbyname(%trim(host));
If (p_hostent = *NULL);
errMsg = 'Host not found!';
EscapeMsg();
Endif;
addr = h_addr;
Endif;
// Create a socket
s = socket(AF_INET: SOCK_STREAM: IPPROTO_IP);
If (s < 0);
ReportError();
Endif;
// connect to the host
connto = *ALLx'00';
connto.sin_family = AF_INET;
connto.sin_addr = addr;
connto.sin_port = port;
If (connect(s: %addr(Connto): %size(connto)) = -1);
callp close(S);
ReportError();
Endif;
return s;
/end-free
P E
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
* UpgradeSock(): Upgrade a socket to use SSL
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
P UpgradeSock B
D UpgradeSock PI like(gsk_handle)
D SslEnv like(gsk_handle) value
D sock 10I 0 value
D Handle s like(Gsk_handle)
/free
rc = gsk_secure_soc_open(SslEnv: Handle);
If (rc <> GSK_OK);
errMsg = %str(gsk_strerror(rc));
return *NULL;
Endif;
rc = gsk_attribute_set_numeric_value(Handle
: GSK_HANDSHAKE_TIMEOUT
: 30 );
If (rc <> GSK_OK);
errMsg = %str(gsk_strerror(rc));
gsk_secure_soc_close(Handle);
return *NULL;
Endif;
rc = gsk_secure_soc_init( Handle );
If (rc <> GSK_OK);
errMsg = %str(gsk_strerror(rc));
gsk_secure_soc_close(Handle);
return *NULL;
Endif;
return Handle;
/end-free
P E
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
* CloseSsl(): Close an SSL socket
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
P CloseSsl B
D CloseSsl PI
D Handle like(gsk_handle) value
/free
gsk_secure_Soc_close( handle);
/end-free
P E
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
* CloseSslEnv(): Close SSL Environment
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
P CloseSslEnv B
D CloseSslEnv PI
D SslEnv like(gsk_handle) value
/free
gsk_environment_close( SslEnv );
/end-free
P E
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
* EscapeMsg(): Send an escape message w/reason for SSL failure
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
P EscapeMsg B
D EscapeMsg PI
D SndPgmMsg PR ExtPgm('QMHSNDPM')
D MessageID 7A Const
D QualMsgF 20A Const
D MsgData 256A Const
D MsgDtaLen 10I 0 Const
D MsgType 10A Const
D CallStkEnt 10A Const
D CallStkCnt 10I 0 Const
D MessageKey 4A
D ErrorCode 1A
D ErrorCode DS
D BytesProv 10I 0 inz(0)
D BytesAvail 10I 0 inz(0)
D wwTheKey S 4A
/free
SndPgmMsg( 'CPF9897'
: 'QCPFMSG *LIBL'
: errMsg
: %len(%trimr(errMsg))
: '*ESCAPE'
: '*CTLBDY'
: 1
: wwTheKey
: ErrorCode );
/end-free
P E
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
* ReportError(): Send an escape message explaining any errors
* that occurred.
*
* This function requires binding directory QC2LE in order
* to access the __errno() function.
*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
P ReportError B
D ReportError PI
D get_errno PR * ExtProc('__errno')
D ptrToErrno s *
D errno s 10I 0 based(ptrToErrno)
D QMHSNDPM PR ExtPgm('QMHSNDPM')
D MessageID 7A Const
D QualMsgF 20A Const
D MsgData 1A Const
D MsgDtaLen 10I 0 Const
D MsgType 10A Const
D CallStkEnt 10A Const
D CallStkCnt 10I 0 Const
D MessageKey 4A
D ErrorCode 8192A options(*varsize)
D ErrorCode DS qualified
D BytesProv 1 4I 0 inz(0)
D BytesAvail 5 8I 0 inz(0)
D MsgKey S 4A
D MsgID s 7A
/free
ptrToErrno = get_errno();
MsgID = 'CPE' + %char(errno);
QMHSNDPM( MsgID
: 'QCPFMSG *LIBL'
: ' '
: 0
: '*ESCAPE'
: '*PGMBDY'
: 1
: MsgKey
: ErrorCode );
/end-free
P E
Russell Wesh, PMP | Data Integration Specialist
Sumitomo Drive Technologies
Sumitomo Machinery Corp. of America
Tel: +1-757-485-3355 ext. 8633
Cell: +1-757-822-4446
Fax: +1-757-485-7190
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