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Fix netbiosns expecting too large packet

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(cherry picked from commit b0c753da96)
This commit is contained in:
Jens Nielsen 2018-11-21 09:15:42 +01:00 committed by Dirk Ziegelmeier
parent 66706f469d
commit 52e75369c1
1 changed files with 28 additions and 12 deletions
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40
src/apps/netbiosns/netbiosns.c
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@ -111,6 +111,22 @@ PACK_STRUCT_END
# include "arch/epstruct.h"
#endif
/** NetBIOS message question part */
#ifdef PACK_STRUCT_USE_INCLUDES
# include "arch/bpstruct.h"
#endif
PACK_STRUCT_BEGIN
struct netbios_question_hdr {
PACK_STRUCT_FLD_8(u8_t nametype);
PACK_STRUCT_FLD_8(u8_t encname[(NETBIOS_NAME_LEN * 2) + 1]);
PACK_STRUCT_FIELD(u16_t type);
PACK_STRUCT_FIELD(u16_t cls);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
# include "arch/epstruct.h"
#endif
/** NetBIOS message name part */
#ifdef PACK_STRUCT_USE_INCLUDES
# include "arch/bpstruct.h"
@ -335,11 +351,11 @@ netbiosns_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t
/* if packet is valid */
if (p != NULL) {
char netbios_name[NETBIOS_NAME_LEN + 1];
struct netbios_hdr *netbios_hdr = (struct netbios_hdr *)p->payload;
struct netbios_name_hdr *netbios_name_hdr = (struct netbios_name_hdr *)(netbios_hdr + 1);
struct netbios_hdr *netbios_hdr = (struct netbios_hdr *)p->payload;
struct netbios_question_hdr *netbios_question_hdr = (struct netbios_question_hdr *)(netbios_hdr + 1);
/* is the packet long enough (we need the header in one piece) */
if (p->len < (sizeof(struct netbios_hdr) + sizeof(struct netbios_name_hdr))) {
if (p->len < (sizeof(struct netbios_hdr) + sizeof(struct netbios_question_hdr))) {
/* packet too short */
pbuf_free(p);
return;
@ -352,9 +368,9 @@ netbiosns_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t
((netbios_hdr->flags & PP_NTOHS(NETB_HFLAG_RESPONSE)) == 0) &&
(netbios_hdr->questions == PP_NTOHS(1))) {
/* decode the NetBIOS name */
netbiosns_name_decode((char *)(netbios_name_hdr->encname), netbios_name, sizeof(netbios_name));
netbiosns_name_decode((char *)(netbios_question_hdr->encname), netbios_name, sizeof(netbios_name));
/* check the request type */
if (netbios_name_hdr->type == PP_HTONS(NETB_QTYPE_NB)) {
if (netbios_question_hdr->type == PP_HTONS(NETB_QTYPE_NB)) {
/* if the packet is for us */
if (lwip_strnicmp(netbios_name, NETBIOS_LOCAL_NAME, sizeof(NETBIOS_LOCAL_NAME)) == 0) {
struct pbuf *q;
@ -376,10 +392,10 @@ netbiosns_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t
resp->resp_hdr.additionalRRs = 0;
/* prepare NetBIOS header datas */
MEMCPY( resp->resp_name.encname, netbios_name_hdr->encname, sizeof(netbios_name_hdr->encname));
resp->resp_name.nametype = netbios_name_hdr->nametype;
resp->resp_name.type = netbios_name_hdr->type;
resp->resp_name.cls = netbios_name_hdr->cls;
MEMCPY( resp->resp_name.encname, netbios_question_hdr->encname, sizeof(netbios_question_hdr->encname));
resp->resp_name.nametype = netbios_question_hdr->nametype;
resp->resp_name.type = netbios_question_hdr->type;
resp->resp_name.cls = netbios_question_hdr->cls;
resp->resp_name.ttl = PP_HTONL(NETBIOS_NAME_TTL);
resp->resp_name.datalen = PP_HTONS(sizeof(resp->resp_name.flags) + sizeof(resp->resp_name.addr));
resp->resp_name.flags = PP_HTONS(NETB_NFLAG_NODETYPE_BNODE);
@ -393,7 +409,7 @@ netbiosns_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t
}
}
#if LWIP_NETBIOS_RESPOND_NAME_QUERY
} else if (netbios_name_hdr->type == PP_HTONS(NETB_QTYPE_NBSTAT)) {
} else if (netbios_question_hdr->type == PP_HTONS(NETB_QTYPE_NBSTAT)) {
/* if the packet is for us or general query */
if (!lwip_strnicmp(netbios_name, NETBIOS_LOCAL_NAME, sizeof(NETBIOS_LOCAL_NAME)) ||
!lwip_strnicmp(netbios_name, "*", sizeof(NETBIOS_LOCAL_NAME))) {
@ -419,9 +435,9 @@ netbiosns_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t
/* resp->answer_hdr.authorityRRs = PP_HTONS(0); done by memset() */
/* resp->answer_hdr.additionalRRs = PP_HTONS(0); done by memset() */
/* we will copy the length of the station name */
resp->name_size = netbios_name_hdr->nametype;
resp->name_size = netbios_question_hdr->nametype;
/* we will copy the queried name */
MEMCPY(resp->query_name, netbios_name_hdr->encname, (NETBIOS_NAME_LEN * 2) + 1);
MEMCPY(resp->query_name, netbios_question_hdr->encname, (NETBIOS_NAME_LEN * 2) + 1);
/* NBSTAT */
resp->packet_type = PP_HTONS(0x21);
/* Internet name */