1 // ---------------------------------------------------------------------------------
2 // Manages the Jabber session. Data is taken from the TCP object and pushed into
3 // a SAX push parser as it arrives. When key Jabber documetn elements are met,
5 // ---------------------------------------------------------------------------------
6 #include "opensrf/transport_socket.h"
7 #include "opensrf/transport_message.h"
8 #include "opensrf/generic_utils.h"
13 #include <libxml/globals.h>
14 #include <libxml/xmlerror.h>
15 #include <libxml/parser.h>
16 #include <libxml/parserInternals.h> /* only for xmlNewInputFromFile() */
17 #include <libxml/tree.h>
18 #include <libxml/debugXML.h>
19 #include <libxml/xmlmemory.h>
21 #ifndef TRANSPORT_SESSION_H
22 #define TRANSPORT_SESSION_H
24 #define CONNECTING_1 1 /* just starting the connection to Jabber */
25 #define CONNECTING_2 2 /* First <stream> packet sent and <stream> packet received from server */
27 /* Note. these are growing buffers, so all that's necessary is a sane starting point */
28 #define JABBER_BODY_BUFSIZE 4096
29 #define JABBER_SUBJECT_BUFSIZE 64
30 #define JABBER_THREAD_BUFSIZE 64
31 #define JABBER_JID_BUFSIZE 64
32 #define JABBER_STATUS_BUFSIZE 16
34 // ---------------------------------------------------------------------------------
35 // Takes data from the socket handler and pushes it directly into the push parser
36 // ---------------------------------------------------------------------------------
37 void grab_incoming( void * session, char* data );
39 // ---------------------------------------------------------------------------------
40 // Callback for handling the startElement event. Much of the jabber logic occurs
41 // in this and the characterHandler callbacks.
42 // Here we check for the various top level jabber elements: body, iq, etc.
43 // ---------------------------------------------------------------------------------
44 void startElementHandler(
45 void *session, const xmlChar *name, const xmlChar **atts);
47 // ---------------------------------------------------------------------------------
48 // Callback for handling the endElement event. Updates the Jabber state machine
49 // to let us know the element is over.
50 // ---------------------------------------------------------------------------------
51 void endElementHandler( void *session, const xmlChar *name);
53 // ---------------------------------------------------------------------------------
54 // This is where we extract XML text content. In particular, this is useful for
55 // extracting Jabber message bodies.
56 // ---------------------------------------------------------------------------------
57 void characterHandler(
58 void *session, const xmlChar *ch, int len);
60 void parseWarningHandler( void *session, const char* msg, ... );
61 void parseErrorHandler( void *session, const char* msg, ... );
63 // ---------------------------------------------------------------------------------
64 // Tells the SAX parser which functions will be used as event callbacks
65 // ---------------------------------------------------------------------------------
66 static xmlSAXHandler SAXHandlerStruct = {
67 NULL, /* internalSubset */
68 NULL, /* isStandalone */
69 NULL, /* hasInternalSubset */
70 NULL, /* hasExternalSubset */
71 NULL, /* resolveEntity */
73 NULL, /* entityDecl */
74 NULL, /* notationDecl */
75 NULL, /* attributeDecl */
76 NULL, /* elementDecl */
77 NULL, /* unparsedEntityDecl */
78 NULL, /* setDocumentLocator */
79 NULL, /* startDocument */
80 NULL, /* endDocument */
81 startElementHandler, /* startElement */
82 endElementHandler, /* endElement */
84 characterHandler, /* characters */
85 NULL, /* ignorableWhitespace */
86 NULL, /* processingInstruction */
88 parseWarningHandler, /* xmlParserWarning */
89 parseErrorHandler, /* xmlParserError */
90 NULL, /* xmlParserFatalError : unused */
91 NULL, /* getParameterEntity */
92 NULL, /* cdataBlock; */
93 NULL, /* externalSubset; */
96 NULL, /* startElementNs */
97 NULL, /* endElementNs */
98 NULL /* xmlStructuredErrorFunc */
101 // ---------------------------------------------------------------------------------
102 // Our SAX handler pointer.
103 // ---------------------------------------------------------------------------------
104 static const xmlSAXHandlerPtr SAXHandler = &SAXHandlerStruct;
106 // ---------------------------------------------------------------------------------
107 // Jabber state machine. This is how we know where we are in the Jabber
109 // ---------------------------------------------------------------------------------
110 struct jabber_state_machine_struct {
118 int in_message_error;
123 typedef struct jabber_state_machine_struct jabber_machine;
125 // ---------------------------------------------------------------------------------
126 // Transport session. This maintains all the various parts of a session
127 // ---------------------------------------------------------------------------------
128 struct transport_session_struct {
130 /* our socket connection */
131 transport_socket* sock_obj;
132 /* our Jabber state machine */
133 jabber_machine* state_machine;
134 /* our SAX push parser context */
135 xmlParserCtxtPtr parser_ctxt;
137 /* our text buffers for holding text data */
138 growing_buffer* body_buffer;
139 growing_buffer* subject_buffer;
140 growing_buffer* thread_buffer;
141 growing_buffer* from_buffer;
142 growing_buffer* recipient_buffer;
143 growing_buffer* status_buffer;
144 growing_buffer* message_error_type;
145 growing_buffer* session_id;
146 int message_error_code;
148 /* for OILS extenstions */
149 growing_buffer* router_to_buffer;
150 growing_buffer* router_from_buffer;
151 growing_buffer* router_class_buffer;
152 growing_buffer* router_command_buffer;
153 int router_broadcast;
155 /* this can be anything. It will show up in the
156 callbacks for your convenience. We will *not*
157 deallocate whatever this is when we're done. That's
162 int component; /* true if we're a component */
164 /* the Jabber message callback */
165 void (*message_callback) ( void* user_data, transport_message* msg );
166 //void (iq_callback) ( void* user_data, transport_iq_message* iq );
168 typedef struct transport_session_struct transport_session;
171 // ------------------------------------------------------------------
172 // Allocates and initializes the necessary transport session
174 // ------------------------------------------------------------------
175 transport_session* init_transport( char* server, int port, void* user_data, int component );
177 // ------------------------------------------------------------------
178 // Returns the value of the given XML attribute
179 // The xmlChar** construct is commonly returned from SAX event
180 // handlers. Pass that in with the name of the attribute you want
182 // ------------------------------------------------------------------
183 char* get_xml_attr( const xmlChar** atts, char* attr_name );
185 // ------------------------------------------------------------------
186 // Waits at most 'timeout' seconds for data to arrive from the
187 // TCP handler. A timeout of -1 means to wait indefinitely.
188 // ------------------------------------------------------------------
189 int session_wait( transport_session* session, int timeout );
191 // ---------------------------------------------------------------------------------
192 // Sends the given Jabber message
193 // ---------------------------------------------------------------------------------
194 int session_send_msg( transport_session* session, transport_message* msg );
196 // ---------------------------------------------------------------------------------
197 // Returns 1 if this session is connected to the jabber server. 0 otherwise
198 // ---------------------------------------------------------------------------------
199 int session_connected( transport_session* );
201 // ------------------------------------------------------------------
202 // Deallocates session memory
203 // ------------------------------------------------------------------
204 int session_free( transport_session* session );
206 // ------------------------------------------------------------------
207 // Connects to the Jabber server. Waits at most connect_timeout
208 // seconds before failing
209 // ------------------------------------------------------------------
210 int session_connect( transport_session* session,
211 const char* username, const char* password, const char* resource, int connect_timeout );
213 int session_disconnect( transport_session* session );
215 int reset_session_buffers( transport_session* session );