diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/apps/netbiosns/netbiosns.c')
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/apps/netbiosns/netbiosns.c | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/apps/netbiosns/netbiosns.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/apps/netbiosns/netbiosns.c new file mode 100644 index 0000000..2dfbe65 --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/apps/netbiosns/netbiosns.c @@ -0,0 +1,367 @@ +/** + * @file + * NetBIOS name service responder + */ + +/** + * @defgroup netbiosns NETBIOS responder + * @ingroup apps + * + * 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! + */ + +/* + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT + * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT + * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + * + * This file is part of the lwIP TCP/IP stack. + * + */ + +#include "lwip/apps/netbiosns.h" + +#if LWIP_IPV4 && LWIP_UDP /* don't build if not configured for use in lwipopts.h */ + +#include "lwip/def.h" +#include "lwip/udp.h" +#include "lwip/netif.h" + +#include <string.h> + +/** default port number for "NetBIOS Name service */ +#define NETBIOS_PORT 137 + +/** size of a NetBIOS name */ +#define NETBIOS_NAME_LEN 16 + +/** The Time-To-Live for NetBIOS name responds (in seconds) + * Default is 300000 seconds (3 days, 11 hours, 20 minutes) */ +#define NETBIOS_NAME_TTL 300000u + +/** NetBIOS header flags */ +#define NETB_HFLAG_RESPONSE 0x8000U +#define NETB_HFLAG_OPCODE 0x7800U +#define NETB_HFLAG_OPCODE_NAME_QUERY 0x0000U +#define NETB_HFLAG_AUTHORATIVE 0x0400U +#define NETB_HFLAG_TRUNCATED 0x0200U +#define NETB_HFLAG_RECURS_DESIRED 0x0100U +#define NETB_HFLAG_RECURS_AVAILABLE 0x0080U +#define NETB_HFLAG_BROADCAST 0x0010U +#define NETB_HFLAG_REPLYCODE 0x0008U +#define NETB_HFLAG_REPLYCODE_NOERROR 0x0000U + +/** NetBIOS name flags */ +#define NETB_NFLAG_UNIQUE 0x8000U +#define NETB_NFLAG_NODETYPE 0x6000U +#define NETB_NFLAG_NODETYPE_HNODE 0x6000U +#define NETB_NFLAG_NODETYPE_MNODE 0x4000U +#define NETB_NFLAG_NODETYPE_PNODE 0x2000U +#define NETB_NFLAG_NODETYPE_BNODE 0x0000U + +/** NetBIOS message header */ +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/bpstruct.h" +#endif +PACK_STRUCT_BEGIN +struct netbios_hdr { + PACK_STRUCT_FIELD(u16_t trans_id); + PACK_STRUCT_FIELD(u16_t flags); + PACK_STRUCT_FIELD(u16_t questions); + PACK_STRUCT_FIELD(u16_t answerRRs); + PACK_STRUCT_FIELD(u16_t authorityRRs); + PACK_STRUCT_FIELD(u16_t additionalRRs); +} 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" +#endif +PACK_STRUCT_BEGIN +struct netbios_name_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_FIELD(u32_t ttl); + PACK_STRUCT_FIELD(u16_t datalen); + PACK_STRUCT_FIELD(u16_t flags); + PACK_STRUCT_FLD_S(ip4_addr_p_t addr); +} PACK_STRUCT_STRUCT; +PACK_STRUCT_END +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/epstruct.h" +#endif + +/** NetBIOS message */ +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/bpstruct.h" +#endif +PACK_STRUCT_BEGIN +struct netbios_resp +{ + struct netbios_hdr resp_hdr; + struct netbios_name_hdr resp_name; +} PACK_STRUCT_STRUCT; +PACK_STRUCT_END +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/epstruct.h" +#endif + +#ifdef NETBIOS_LWIP_NAME +#define NETBIOS_LOCAL_NAME NETBIOS_LWIP_NAME +#else +static char netbiosns_local_name[NETBIOS_NAME_LEN]; +#define NETBIOS_LOCAL_NAME netbiosns_local_name +#endif + +struct udp_pcb *netbiosns_pcb; + +/** Decode a NetBIOS name (from packet to string) */ +static int +netbiosns_name_decode(char *name_enc, char *name_dec, int name_dec_len) +{ + char *pname; + char cname; + char cnbname; + int idx = 0; + + LWIP_UNUSED_ARG(name_dec_len); + + /* Start decoding netbios name. */ + pname = name_enc; + for (;;) { + /* Every two characters of the first level-encoded name + * turn into one character in the decoded name. */ + cname = *pname; + if (cname == '\0') + break; /* no more characters */ + if (cname == '.') + break; /* scope ID follows */ + if (cname < 'A' || cname > 'Z') { + /* Not legal. */ + return -1; + } + cname -= 'A'; + cnbname = cname << 4; + pname++; + + cname = *pname; + if (cname == '\0' || cname == '.') { + /* No more characters in the name - but we're in + * the middle of a pair. Not legal. */ + return -1; + } + if (cname < 'A' || cname > 'Z') { + /* Not legal. */ + return -1; + } + cname -= 'A'; + cnbname |= cname; + pname++; + + /* Do we have room to store the character? */ + if (idx < NETBIOS_NAME_LEN) { + /* Yes - store the character. */ + name_dec[idx++] = (cnbname!=' '?cnbname:'\0'); + } + } + + return 0; +} + +#if 0 /* function currently unused */ +/** Encode a NetBIOS name (from string to packet) - currently unused because + we don't ask for names. */ +static int +netbiosns_name_encode(char *name_enc, char *name_dec, int name_dec_len) +{ + char *pname; + char cname; + unsigned char ucname; + int idx = 0; + + /* Start encoding netbios name. */ + pname = name_enc; + + for (;;) { + /* Every two characters of the first level-encoded name + * turn into one character in the decoded name. */ + cname = *pname; + if (cname == '\0') + break; /* no more characters */ + if (cname == '.') + break; /* scope ID follows */ + if ((cname < 'A' || cname > 'Z') && (cname < '0' || cname > '9')) { + /* Not legal. */ + return -1; + } + + /* Do we have room to store the character? */ + if (idx >= name_dec_len) { + return -1; + } + + /* Yes - store the character. */ + ucname = cname; + name_dec[idx++] = ('A'+((ucname>>4) & 0x0F)); + name_dec[idx++] = ('A'+( ucname & 0x0F)); + pname++; + } + + /* Fill with "space" coding */ + for (;idx < name_dec_len - 1;) { + name_dec[idx++] = 'C'; + name_dec[idx++] = 'A'; + } + + /* Terminate string */ + name_dec[idx] = '\0'; + + return 0; +} +#endif /* 0 */ + +/** NetBIOS Name service recv callback */ +static void +netbiosns_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p, const ip_addr_t *addr, u16_t port) +{ + LWIP_UNUSED_ARG(arg); + + /* 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); + + /* we only answer if we got a default interface */ + if (netif_default != NULL) { + /* @todo: do we need to check answerRRs/authorityRRs/additionalRRs? */ + /* if the packet is a NetBIOS name query question */ + if (((netbios_hdr->flags & PP_NTOHS(NETB_HFLAG_OPCODE)) == PP_NTOHS(NETB_HFLAG_OPCODE_NAME_QUERY)) && + ((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)); + /* if the packet is for us */ + if (lwip_strnicmp(netbios_name, NETBIOS_LOCAL_NAME, sizeof(NETBIOS_LOCAL_NAME)) == 0) { + struct pbuf *q; + struct netbios_resp *resp; + + q = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct netbios_resp), PBUF_RAM); + if (q != NULL) { + resp = (struct netbios_resp*)q->payload; + + /* prepare NetBIOS header response */ + resp->resp_hdr.trans_id = netbios_hdr->trans_id; + resp->resp_hdr.flags = PP_HTONS(NETB_HFLAG_RESPONSE | + NETB_HFLAG_OPCODE_NAME_QUERY | + NETB_HFLAG_AUTHORATIVE | + NETB_HFLAG_RECURS_DESIRED); + resp->resp_hdr.questions = 0; + resp->resp_hdr.answerRRs = PP_HTONS(1); + resp->resp_hdr.authorityRRs = 0; + 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; + 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); + ip4_addr_copy(resp->resp_name.addr, *netif_ip4_addr(netif_default)); + + /* send the NetBIOS response */ + udp_sendto(upcb, q, addr, port); + + /* free the "reference" pbuf */ + pbuf_free(q); + } + } + } + } + /* free the pbuf */ + pbuf_free(p); + } +} + +/** + * @ingroup netbiosns + * Init netbios responder + */ +void +netbiosns_init(void) +{ +#ifdef NETBIOS_LWIP_NAME + LWIP_ASSERT("NetBIOS name is too long!", strlen(NETBIOS_LWIP_NAME) < NETBIOS_NAME_LEN); +#endif + + netbiosns_pcb = udp_new_ip_type(IPADDR_TYPE_ANY); + if (netbiosns_pcb != NULL) { + /* we have to be allowed to send broadcast packets! */ + ip_set_option(netbiosns_pcb, SOF_BROADCAST); + udp_bind(netbiosns_pcb, IP_ANY_TYPE, NETBIOS_PORT); + udp_recv(netbiosns_pcb, netbiosns_recv, netbiosns_pcb); + } +} + +#ifndef NETBIOS_LWIP_NAME +/** + * @ingroup netbiosns + * Set netbios name. ATTENTION: the hostname must be less than 15 characters! + */ +void +netbiosns_set_name(const char* hostname) +{ + size_t copy_len = strlen(hostname); + LWIP_ASSERT("NetBIOS name is too long!", copy_len < NETBIOS_NAME_LEN); + if (copy_len >= NETBIOS_NAME_LEN) { + copy_len = NETBIOS_NAME_LEN - 1; + } + MEMCPY(netbiosns_local_name, hostname, copy_len + 1); +} +#endif + +/** + * @ingroup netbiosns + * Stop netbios responder + */ +void +netbiosns_stop(void) +{ + if (netbiosns_pcb != NULL) { + udp_remove(netbiosns_pcb); + netbiosns_pcb = NULL; + } +} + +#endif /* LWIP_IPV4 && LWIP_UDP */ |