pidf.c

用来作为linux中SIP SERVER,完成VOIP网络电话中服务器的功能

					  prescap_name, ((prescaps & (1 << i)) ? "true" : "false"), prescap_name, CRLF);
		  str_append(_b, prescap, prescap_l);
	     }
	     str_append(_b, PRESCAPS_ETAG CRLF, PRESCAPS_ETAG_L + CRLF_L);
	}
	str_append(_b, STATUS_ETAG CRLF, STATUS_ETAG_L + CRLF_L);
	return 0;
}

/*
 * Create start of pidf tuple
 */
int pidf_end_tuple(str* _b, int _l)
{
	if ((TUPLE_ETAG_L + 
	     CRLF_L
	    ) > _l) {
		paerrno = PA_SMALL_BUFFER;
		LOG(L_ERR, "pidf_end_tuple(): Buffer too small\n");
		return -1;
	}

	str_append(_b, TUPLE_ETAG CRLF,
		   TUPLE_ETAG_L + CRLF_L);
	return 0;
}

/*
 * End the document
 */
int end_pidf_doc(str* _b, int _l)
{
	if (_l < (PRESENCE_ETAG_L + CRLF_L)) {
		paerrno = PA_SMALL_BUFFER;
		LOG(L_ERR, "end_pidf_doc(): Buffer too small\n");
		return -1;
	}

	str_append(_b, PRESENCE_ETAG CRLF, PRESENCE_ETAG_L + CRLF_L);
	return 0;
}



xmlDocPtr event_body_parse(char *event_body)
{
	return xmlParseMemory(event_body, strlen(event_body));
}

/*
 * apply procedure f to each xmlNodePtr in doc matched by xpath
 */
void xpath_map(xmlDocPtr doc, char *xpath, void (*f)(xmlNodePtr, void *), void *data)
{
	xmlXPathContextPtr context;
	xmlXPathObjectPtr result;
	xmlNodeSetPtr nodeset;
	int i;

	context = xmlXPathNewContext(doc);
	result = xmlXPathEvalExpression((xmlChar*)xpath, context);
	if(!result || xmlXPathNodeSetIsEmpty(result->nodesetval)){
		fprintf(stderr, "xpath_map: no result for xpath=%s\n", xpath);
		return;
	}
	nodeset = result->nodesetval;
	for (i=0; i < nodeset->nodeNr; i++) {
		xmlNodePtr node = nodeset->nodeTab[i];
		printf("name[%d]: %s\n", i, node->name);
		f(node, data);
	}
	xmlXPathFreeContext(context);
}

xmlNodePtr xpath_get_node(xmlDocPtr doc, char *xpath)
{
	xmlXPathContextPtr context;
	xmlXPathObjectPtr result;
	xmlNodeSetPtr nodeset;
	xmlNodePtr node;

	context = xmlXPathNewContext(doc);
	result = xmlXPathEvalExpression((xmlChar*)xpath, context);
	if(xmlXPathNodeSetIsEmpty(result->nodesetval)){
		fprintf(stderr, "xpath_get_node: no result for xpath=%s\n", xpath);
		return NULL;
	}
	nodeset = result->nodesetval;
	node = nodeset->nodeTab[0];
	xmlXPathFreeContext(context);
	return node;
}

xmlAttrPtr xmlNodeGetAttrByName(xmlNodePtr node, const char *name)
{
	xmlAttrPtr attr = node->properties;
	while (attr) {
		if (xmlStrcasecmp(attr->name, (xmlChar*)name) == 0)
			return attr;
		attr = attr->next;
	}
	return NULL;
}

char *xmlNodeGetAttrContentByName(xmlNodePtr node, const char *name)
{
     xmlAttrPtr attr = xmlNodeGetAttrByName(node, name);
     if (attr)
	  return (char*)xmlNodeGetContent(attr->children);
     else
	  return NULL;
}

xmlNodePtr xmlNodeGetChildByName(xmlNodePtr node, const char *name)
{
	xmlNodePtr cur = node->children;
	while (cur) {
		if (xmlStrcasecmp(cur->name, (xmlChar*)name) == 0)
			return cur;
		cur = cur->next;
	}
	return NULL;
}

xmlNodePtr xmlNodeGetNodeByName(xmlNodePtr node, const char *name, const char *ns)
{
	xmlNodePtr cur = node;
	while (cur) {
		xmlNodePtr match = NULL;
		if (xmlStrcasecmp(cur->name, (xmlChar*)name) == 0) {
			if (!ns || (cur->ns && 
						xmlStrcasecmp(cur->ns->prefix, (xmlChar*)ns) == 0))
				return cur;
		}
		match = xmlNodeGetNodeByName(cur->children, name, ns);
		if (match)
			return match;
		cur = cur->next;
	}
	return NULL;
}

char *xmlNodeGetNodeContentByName(xmlNodePtr root, const char *name, const char *ns)
{
	xmlNodePtr node = xmlNodeGetNodeByName(root, name, ns);
	if (node)
		return (char*)xmlNodeGetContent(node->children);
	else
		return NULL;
}

xmlNodePtr xmlDocGetNodeByName(xmlDocPtr doc, const char *name, const char *ns)
{
	xmlNodePtr cur = doc->children;
	return xmlNodeGetNodeByName(cur, name, ns);
}

char *xmlDocGetNodeContentByName(xmlDocPtr doc, const char *name, const char *ns)
{
	xmlNodePtr node = xmlDocGetNodeByName(doc, name, ns);
	if (node)
		return (char*)xmlNodeGetContent(node->children);
	else
		return NULL;
}


void xmlNodeMapByName(xmlNodePtr node, const char *name, const char *ns, 
		      void (f)(xmlNodePtr, void*), void *data)
{
	xmlNodePtr cur = node;
	if (!f)
		return;
	while (cur) {
		if (xmlStrcasecmp(cur->name, (xmlChar*)name) == 0) {
			if (!ns || (cur->ns &&
						xmlStrcasecmp(cur->ns->prefix, (xmlChar*)ns) == 0))
				f(cur, data);
		}
		/* visit children */
		xmlNodeMapByName(cur->children, name, ns, f, data);

		cur = cur->next;
	}
}

void xmlDocMapByName(xmlDocPtr doc, const char *name, const char *ns,
			   void (f)(xmlNodePtr, void*), void *data )
{
	xmlNodePtr cur = doc->children;
	xmlNodeMapByName(cur, name, ns, f, data);
}

int parse_pidf(char *pidf_body, str *contact_str, str *basic_str, str *status_str, 
	       str *location_str, str *site_str, str *floor_str, str *room_str,
	       double *xp, double *yp, double *radiusp,
	       str *packet_loss_str, double *priorityp, time_t *expiresp,
	       int *prescapsp)
{
     int flags = 0;
     xmlDocPtr doc = NULL;
     xmlNodePtr presenceNode = NULL;
     xmlNodePtr prescapsNode = NULL;
     char *presence = NULL;
     char *sipuri = NULL;
     char *contact = NULL;
     char *basic = NULL;
     char *status = NULL;
     char *location = NULL;
     char *site = NULL;
     char *floor = NULL;
     char *room = NULL;
     char *x = NULL;
     char *y = NULL;
     char *radius = NULL;
     char *packet_loss = NULL;
     char *priority_str = NULL;
     char *expires_str = NULL;
     int prescaps = 0;

     doc = event_body_parse(pidf_body);
     if (!doc) {
	  return flags;
     }

     presenceNode = xmlDocGetNodeByName(doc, "presence", NULL);
     presence = xmlDocGetNodeContentByName(doc, "presence", NULL);
     contact = xmlDocGetNodeContentByName(doc, "contact", NULL);
     basic = xmlDocGetNodeContentByName(doc, "basic", NULL);
     status = xmlDocGetNodeContentByName(doc, "status", NULL);
     location = xmlDocGetNodeContentByName(doc, "loc", NULL);
     site = xmlDocGetNodeContentByName(doc, "site", NULL);
     floor = xmlDocGetNodeContentByName(doc, "floor", NULL);
     room = xmlDocGetNodeContentByName(doc, "room", NULL);
     x = xmlDocGetNodeContentByName(doc, "x", NULL);
     y = xmlDocGetNodeContentByName(doc, "y", NULL);
     radius = xmlDocGetNodeContentByName(doc, "radius", NULL);
     packet_loss = xmlDocGetNodeContentByName(doc, "packet-loss", NULL);
     priority_str = xmlDocGetNodeContentByName(doc, "priority", NULL);
     expires_str = xmlDocGetNodeContentByName(doc, "expires", NULL);
     prescapsNode = xmlDocGetNodeByName(doc, "prescaps", NULL);
		
     if (presenceNode)
	  sipuri = xmlNodeGetAttrContentByName(presenceNode, "entity");

     LOG(L_INFO, "parse_pidf: sipuri=%p:%s contact=%p:%s basic=%p:%s location=%p:%s\n",
	 sipuri, sipuri, contact, contact, basic, basic, location, location);
     LOG(L_INFO, "parse_pidf: site=%p:%s floor=%p:%s room=%p:%s\n",
	 site, site, floor, floor, room, room);
     LOG(L_INFO, "parse_pidf: x=%p:%s y=%p:%s radius=%p:%s\n",
	 x, x, y, y, radius, radius);
     if (packet_loss)
	  LOG(L_INFO, "packet_loss=%p:%s\n", packet_loss, packet_loss);

     if (contact_str && contact) {
	  contact_str->len = strlen(contact);
	  contact_str->s = strdup(contact);
	  flags |= PARSE_PIDF_CONTACT;
     }
     if (basic_str && basic) {
	  basic_str->len = strlen(basic);
	  basic_str->s = strdup(basic);
	  flags |= PARSE_PIDF_BASIC;
     }
     if (status_str && status) {
	  status_str->len = strlen(status);
	  status_str->s = strdup(status);
	  flags |= PARSE_PIDF_STATUS;
     }
     if (location_str && location) {
	  location_str->len = strlen(location);
	  location_str->s = strdup(location);
	  flags |= PARSE_PIDF_LOC;
     }
     if (site_str && site) {
	  site_str->len = strlen(site);
	  site_str->s = strdup(site);
	  flags |= PARSE_PIDF_SITE;
     }
     if (floor_str && floor) {
	  floor_str->len = strlen(floor);
	  floor_str->s = strdup(floor);
	  flags |= PARSE_PIDF_FLOOR;
     }
     if (room_str && room) {
	  room_str->len = strlen(room);
	  room_str->s = strdup(room);
	  flags |= PARSE_PIDF_ROOM;
     }
     if (xp && x) {
	  *xp = strtod(x, NULL);
	  flags |= PARSE_PIDF_X;
     }
     if (yp && y) {
	  *yp = strtod(y, NULL);
	  flags |= PARSE_PIDF_Y;
     }
     if (radiusp && radius) {
	  *radiusp = strtod(radius, NULL);
	  flags |= PARSE_PIDF_RADIUS;
     }
     if (packet_loss_str && packet_loss) {
	  packet_loss_str->len = strlen(packet_loss);
	  packet_loss_str->s = strdup(packet_loss);
	  flags |= PARSE_PIDF_PACKET_LOSS;
     }
     if (expiresp && expires_str) {
       *expiresp = act_time + strtod(expires_str, NULL);
       flags |= PARSE_PIDF_EXPIRES;
     }
     if (priorityp && priority_str) {
	  *priorityp = strtod(priority_str, NULL);
	  flags |= PARSE_PIDF_PRIORITY;
     }
     if (prescapsNode) {
	  int i;
	  for (i = 0; i < 4; i++) {
	       const char *prescap_name = prescap_names[i];
	       xmlNodePtr prescap_node = xmlNodeGetNodeByName(prescapsNode, prescap_name, NULL);
	       const char *prescap_str = xmlNodeGetNodeContentByName(prescapsNode, prescap_name, NULL);
	       if (prescap_str && (strcasecmp(prescap_str, "true") == 0))
		    prescaps |= (1 << i);
	       LOG(L_INFO, "parse_pidf: prescap=%s node=%p value=%s\n", prescap_name, prescap_node, prescap_str);
	  }
	  LOG(L_INFO, "parse_pidf: prescaps=%x\n", prescaps);
     }
     if (prescapsp) {
	  *prescapsp = prescaps;
	  flags |= PARSE_PIDF_PRESCAPS;
     }
     return flags;
}