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Added (and using) defines for flags & ttl, checking NETBIOS_LWIP_NAME vs NETBIOS_NAME_LEN, added file description.

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goldsimon 2007-10-21 12:27:33 +00:00
parent cfbf1497d2
commit dd75189919
1 changed files with 45 additions and 6 deletions
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51
apps/netbios/netbios.c
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@ -4,6 +4,14 @@
#include "lwip/udp.h"
#include "lwip/netif.h"
/** This is an example implementation of a NetBIOS name server.
* It responds to name queries for a configurable name.
* Name resolving is not supported.
*
* Note that the device doesn't broadcast it's own name so can't
* detect duplicate names!
*/
#if LWIP_UDP
/** default port number for "NetBIOS Name service */
@ -15,6 +23,30 @@
/** NetBIOS name of LWIP device */
#define NETBIOS_LWIP_NAME "NETBIOSLWIPDEV"
/** The Time-To-Live for NetBIOS name responds (in seconds)
* Default is 300000 seconds (3 days, 11 hours, 20 minutes) */
#define NETBIOS_TTL 300000
/** NetBIOS header flags */
#define NETB_HFLAG_RESPONSE 0x8000
#define NETB_HFLAG_OPCODE 0x7800
#define NETB_HFLAG_OPCODE_NAME_QUERY 0x0000
#define NETB_HFLAG_AUTHORATIVE 0x0400
#define NETB_HFLAG_TRUNCATED 0x0200
#define NETB_HFLAG_RECURS_DESIRED 0x0100
#define NETB_HFLAG_RECURS_AVAILABLE 0x0080
#define NETB_HFLAG_BROADCAST 0x0010
#define NETB_HFLAG_REPLYCODE 0x0008
#define NETB_HFLAG_REPLYCODE_NOERROR 0x0000
/** NetBIOS name flags */
#define NETB_NFLAG_UNIQUE 0x8000
#define NETB_NFLAG_NODETYPE 0x6000
#define NETB_NFLAG_NODETYPE_HNODE 0x6000
#define NETB_NFLAG_NODETYPE_MNODE 0x4000
#define NETB_NFLAG_NODETYPE_PNODE 0x2000
#define NETB_NFLAG_NODETYPE_BNODE 0x0000
/** NetBIOS message header */
#ifdef PACK_STRUCT_USE_INCLUDES
# include "arch/bpstruct.h"
@ -163,8 +195,11 @@ netbios_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, struct ip_addr *ad
struct netbios_hdr* netbios_hdr = p->payload;
struct netbios_name_hdr* netbios_name_hdr = (struct netbios_name_hdr*)(netbios_hdr+1);
/* if the packet is a NetBIOS question */
if (((ntohs(netbios_hdr->flags) & 0x8000/** @todo */)==0) && (ntohs(netbios_hdr->questions)==1)) {
/* @todo: do we need to check answerRRs/authorityRRs/additionalRRs? */
/* if the packet is a NetBIOS name query question */
if (((ntohs(netbios_hdr->flags) & NETB_HFLAG_OPCODE) == NETB_HFLAG_OPCODE_NAME_QUERY) &&
((ntohs(netbios_hdr->flags) & NETB_HFLAG_RESPONSE) == 0) &&
(ntohs(netbios_hdr->questions) == 1)) {
/* decode the NetBIOS name */
netbios_name_decoding( netbios_name_hdr->encname, netbios_name, sizeof(netbios_name));
/* if the packet is for us */
@ -177,7 +212,9 @@ netbios_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, struct ip_addr *ad
/* prepare NetBIOS header response */
netbios_resp.resp_hdr.trans_id = netbios_hdr->trans_id;
netbios_resp.resp_hdr.flags = htons(0x8500);/** @todo */
netbios_resp.resp_hdr.flags = htons(NETB_HFLAG_RESPONSE |
NETB_HFLAG_OPCODE_NAME_QUERY |
NETB_HFLAG_RECURS_DESIRED);
netbios_resp.resp_hdr.questions = 0;
netbios_resp.resp_hdr.answerRRs = htons(1);
netbios_resp.resp_hdr.authorityRRs = 0;
@ -188,14 +225,14 @@ netbios_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, struct ip_addr *ad
netbios_resp.resp_name.nametype = netbios_name_hdr->nametype;
netbios_resp.resp_name.type = netbios_name_hdr->type;
netbios_resp.resp_name.class = netbios_name_hdr->class;
netbios_resp.resp_name.ttl = 0xe0930400; /** @todo */
netbios_resp.resp_name.ttl = htonl(NETBIOS_TTL);
netbios_resp.resp_name.datalen = htons(sizeof(netbios_resp.resp_name.flags)+sizeof(netbios_resp.resp_name.addr));
netbios_resp.resp_name.flags = 0x0060;/** @todo */
netbios_resp.resp_name.flags = htons(NETB_NFLAG_NODETYPE_BNODE);
netbios_resp.resp_name.addr = netif_default->ip_addr.addr;
/* alloc a "reference" pbuf */
q = pbuf_alloc(PBUF_TRANSPORT, 0, PBUF_REF);
if (p != NULL) {
if (q != NULL) {
/* initialize the "reference" pbuf on the NetBIOS response */
q->payload = (void*)(&netbios_resp);
q->len = q->tot_len = sizeof(netbios_resp);
@ -217,6 +254,8 @@ void netbios_init(void)
{
struct udp_pcb *pcb;
LWIP_ASSERT("NetBIOS name is too long!", strlen(NETBIOS_LWIP_NAME) < NETBIOS_NAME_LEN);
pcb = udp_new();
if (pcb != NULL) {
udp_bind(pcb, IP_ADDR_ANY, NETBIOS_PORT);