include/opensrf/transport_session.h

   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,
   4 // logic ensues.
   5 // ---------------------------------------------------------------------------------
   6 #include "libxml.h"
   7 #include "transport_socket.h"
   8 #include "transport_message.h"
   9 #include "generic_utils.h"
  10
  11 #include <string.h>
  12 #include <libxml/globals.h>
  13 #include <libxml/xmlerror.h>
  14 #include <libxml/parser.h>
  15 #include <libxml/parserInternals.h> /* only for xmlNewInputFromFile() */
  16 #include <libxml/tree.h>
  17 #include <libxml/debugXML.h>
  18 #include <libxml/xmlmemory.h>
  19
  20 #ifndef TRANSPORT_SESSION_H
  21 #define TRANSPORT_SESSION_H
  22
  23 #define CONNECTING_1 1 /* just starting the connection to Jabber */
  24 #define CONNECTING_2 2 /* First <stream> packet sent and <stream> packet received from server */
  25
  26 /* Note. these are growing buffers, so all that's necessary is a sane starting point */
  27 #define JABBER_BODY_BUFSIZE             4096
  28 #define JABBER_SUBJECT_BUFSIZE  64
  29 #define JABBER_THREAD_BUFSIZE           64
  30 #define JABBER_JID_BUFSIZE                      64
  31 #define JABBER_STATUS_BUFSIZE           16
  32
  33 #ifdef DMALLOC
  34 #include "dmalloc.h"
  35 #endif
  36
  37 // ---------------------------------------------------------------------------------
  38 // Takes data from the socket handler and pushes it directly into the push parser
  39 // ---------------------------------------------------------------------------------
  40 void grab_incoming( void * session, char* data );
  41
  42 // ---------------------------------------------------------------------------------
  43 // Callback for handling the startElement event.  Much of the jabber logic occurs
  44 // in this and the characterHandler callbacks.
  45 // Here we check for the various top level jabber elements: body, iq, etc.
  46 // ---------------------------------------------------------------------------------
  47 void startElementHandler(
  48                 void *session, const xmlChar *name, const xmlChar **atts);
  49
  50 // ---------------------------------------------------------------------------------
  51 // Callback for handling the endElement event.  Updates the Jabber state machine
  52 // to let us know the element is over.
  53 // ---------------------------------------------------------------------------------
  54 void endElementHandler( void *session, const xmlChar *name);
  55
  56 // ---------------------------------------------------------------------------------
  57 // This is where we extract XML text content.  In particular, this is useful for
  58 // extracting Jabber message bodies.
  59 // ---------------------------------------------------------------------------------
  60 void characterHandler(
  61                 void *session, const xmlChar *ch, int len);
  62
  63 void  parseWarningHandler( void *session, const char* msg, ... );
  64 void  parseErrorHandler( void *session, const char* msg, ... );
  65
  66 // ---------------------------------------------------------------------------------
  67 // Tells the SAX parser which functions will be used as event callbacks
  68 // ---------------------------------------------------------------------------------
  69 static xmlSAXHandler SAXHandlerStruct = {
  70    NULL,                                                        /* internalSubset */
  71    NULL,                                                        /* isStandalone */
  72    NULL,                                                        /* hasInternalSubset */
  73    NULL,                                                        /* hasExternalSubset */
  74    NULL,                                                        /* resolveEntity */
  75    NULL,                                                        /* getEntity */
  76    NULL,                                                        /* entityDecl */
  77    NULL,                                                        /* notationDecl */
  78    NULL,                                                        /* attributeDecl */
  79    NULL,                                                        /* elementDecl */
  80    NULL,                                                        /* unparsedEntityDecl */
  81    NULL,                                                        /* setDocumentLocator */
  82    NULL,                                                        /* startDocument */
  83    NULL,                                                        /* endDocument */
  84         startElementHandler,            /* startElement */
  85         endElementHandler,              /* endElement */
  86    NULL,                                                        /* reference */
  87         characterHandler,                       /* characters */
  88    NULL,                                                        /* ignorableWhitespace */
  89    NULL,                                                        /* processingInstruction */
  90    NULL,                                                        /* comment */
  91    parseWarningHandler,         /* xmlParserWarning */
  92    parseErrorHandler,           /* xmlParserError */
  93    NULL,                                                        /* xmlParserFatalError : unused */
  94    NULL,                                                        /* getParameterEntity */
  95    NULL,                                                        /* cdataBlock; */
  96    NULL,                                                        /* externalSubset; */
  97    1,
  98    NULL,
  99    NULL,                                                        /* startElementNs */
 100    NULL,                                                        /* endElementNs */
 101         NULL                                                    /* xmlStructuredErrorFunc */
 102 };
 103
 104 // ---------------------------------------------------------------------------------
 105 // Our SAX handler pointer.
 106 // ---------------------------------------------------------------------------------
 107 static const xmlSAXHandlerPtr SAXHandler = &SAXHandlerStruct;
 108
 109 // ---------------------------------------------------------------------------------
 110 // Jabber state machine.  This is how we know where we are in the Jabber
 111 // conversation.
 112 // ---------------------------------------------------------------------------------
 113 struct jabber_state_machine_struct {
 114         int connected;
 115         int connecting;
 116         int in_message;
 117         int in_message_body;
 118         int in_thread;
 119         int in_subject;
 120         int in_error;
 121         int in_message_error;
 122         int in_iq;
 123         int in_presence;
 124         int in_status;
 125 };
 126 typedef struct jabber_state_machine_struct jabber_machine;
 127
 128 // ---------------------------------------------------------------------------------
 129 // Transport session.  This maintains all the various parts of a session
 130 // ---------------------------------------------------------------------------------
 131 struct transport_session_struct {
 132
 133         /* our socket connection */
 134         transport_socket* sock_obj;
 135         /* our Jabber state machine */
 136         jabber_machine* state_machine;
 137         /* our SAX push parser context */
 138         xmlParserCtxtPtr parser_ctxt;
 139
 140         /* our text buffers for holding text data */
 141         growing_buffer* body_buffer;
 142         growing_buffer* subject_buffer;
 143         growing_buffer* thread_buffer;
 144         growing_buffer* from_buffer;
 145         growing_buffer* recipient_buffer;
 146         growing_buffer* status_buffer;
 147         growing_buffer* message_error_type;
 148         int message_error_code;
 149
 150         /* for OILS extenstions */
 151         growing_buffer* router_to_buffer;
 152         growing_buffer* router_from_buffer;
 153         growing_buffer* router_class_buffer;
 154         growing_buffer* router_command_buffer;
 155         int router_broadcast;
 156
 157         /* this can be anything.  It will show up in the
 158                 callbacks for your convenience. We will *not*
 159            deallocate whatever this is when we're done.  That's
 160                 your job.
 161          */
 162         void* user_data;
 163
 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 );
 167 };
 168 typedef struct transport_session_struct transport_session;
 169
 170
 171 // ------------------------------------------------------------------
 172 // Allocates and initializes the necessary transport session
 173 // data structures.
 174 // ------------------------------------------------------------------
 175 transport_session* init_transport(  char* server, int port, void* user_data );
 176
 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
 181 // to retrieve.
 182 // ------------------------------------------------------------------
 183 char* get_xml_attr( const xmlChar** atts, char* attr_name );
 184
 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 );
 190
 191 // ---------------------------------------------------------------------------------
 192 // Sends the given Jabber message
 193 // ---------------------------------------------------------------------------------
 194 int session_send_msg( transport_session* session, transport_message* msg );
 195
 196 // ---------------------------------------------------------------------------------
 197 // Returns 1 if this session is connected to the jabber server. 0 otherwise
 198 // ---------------------------------------------------------------------------------
 199 int session_connected( transport_session* );
 200
 201 // ------------------------------------------------------------------
 202 // Deallocates session memory
 203 // ------------------------------------------------------------------
 204 int session_free( transport_session* session );
 205
 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 );
 212
 213 int session_disconnect( transport_session* session );
 214
 215 int reset_session_buffers( transport_session* session );
 216
 217 #endif