FreeCalypso > hg > fc-tourmaline
view src/g23m-fad/ppp/ppp_ncpf.c @ 303:f76436d19a7a default tip
!GPRS config: fix long-standing AT+COPS chance hanging bug
There has been a long-standing bug in FreeCalypso going back years:
sometimes in the AT command bring-up sequence of an ACI-only MS,
the AT+COPS command would produce only a power scan followed by
cessation of protocol stack activity (only L1 ADC traces), instead
of the expected network search sequence. This behaviour was seen
in different FC firmware versions going back to Citrine, and seemed
to follow some law of chance, not reliably repeatable.
This bug has been tracked down and found to be specific to !GPRS
configuration, stemming from our TCS2/TCS3 hybrid and reconstruction
of !GPRS support that was bitrotten in TCS3.2/LoCosto version.
ACI module psa_mms.c, needed only for !GPRS, was missing in the TCS3
version and had to be pulled from TCS2 - but as it turns out,
there is a new field in the MMR_REG_REQ primitive that needs to be
set correctly, and that psa_mms.c module is the place where this
initialization needed to be added.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 08 Jun 2023 08:23:37 +0000 |
| parents | fa8dc04885d8 |
| children |
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/* +----------------------------------------------------------------------------- | Project : | Modul : +----------------------------------------------------------------------------- | Copyright 2002 Texas Instruments Berlin, AG | All rights reserved. | | This file is confidential and a trade secret of Texas | Instruments Berlin, AG | The receipt of or possession of this file does not convey | any rights to reproduce or disclose its contents or to | manufacture, use, or sell anything it may describe, in | whole, or in part, without the specific written consent of | Texas Instruments Berlin, AG. +----------------------------------------------------------------------------- | Purpose : This modul is part of the entity PPP and implements all | procedures and functions as described in the | SDL-documentation (NCP-statemachine) +----------------------------------------------------------------------------- */ #define ENTITY_PPP /*==== INCLUDES =============================================================*/ #include "typedefs.h" /* to get Condat data types */ #include "vsi.h" /* to get a lot of macros */ #include "macdef.h" /* to get a lot of macros */ #include "custom.h" /* to get a lot of macros */ #include "gsm.h" /* to get a lot of macros */ #include "prim.h" /* to get the definitions of used SAP and directions */ #include "dti.h" /* to get the DTILIB definitions */ #include "ppp.h" /* to get the global entity definitions */ #include <string.h> /* to get memcpy */ #include "ppp_arbf.h" /* to get function interface from arb */ /*==== CONST ================================================================*/ #define TYPE_HC 2 #define TYPE_IP 3 #define TYPE_PDNS 129 #define TYPE_SDNS 131 #define TYPE_ADJUST 125 #define MASK_TYPE_HC TYPE_HC #define MASK_TYPE_IP TYPE_IP #define MASK_TYPE_PDNS (TYPE_PDNS - TYPE_ADJUST) #define MASK_TYPE_SDNS (TYPE_SDNS - TYPE_ADJUST) #define LENGTH_HC_VJ 6 #define LENGTH_HC_MAX LENGTH_HC_VJ #define LENGTH_IP 6 #define LENGTH_PDNS 6 #define LENGTH_SDNS 6 #define NCP_CONF_REQ_LENGTH_MAX (4 + \ LENGTH_HC_MAX + \ LENGTH_IP + \ LENGTH_PDNS + \ LENGTH_SDNS) #define NCP_TERM_REQ_LENGTH 6 #define PPP_CSID_YES 1 /*==== LOCAL VARS ===========================================================*/ /*==== PRIVATE FUNCTIONS ====================================================*/ /*==== PUBLIC FUNCTIONS =====================================================*/ /* +------------------------------------------------------------------------------ | Function : ncp_init +------------------------------------------------------------------------------ | Description : The function ncp_init() initialize Network Control Protocol | | Parameters : no parameters | +------------------------------------------------------------------------------ */ GLOBAL void ncp_init () { TRACE_FUNCTION( "ncp_init" ); /* * initialize values */ ppp_data->ncp.req_hc = PPP_HC_DEFAULT; ppp_data->ncp.req_msid = PPP_MSID_DEFAULT; ppp_data->ncp.req_ip = PPP_IP_DEFAULT; ppp_data->ncp.req_pdns = PPP_PDNS_DEFAULT; ppp_data->ncp.req_sdns = PPP_SDNS_DEFAULT; ppp_data->ncp.req_gateway = PPP_GATEWAY_DEFAULT; ppp_data->ncp.s_hc = PPP_HC_DEFAULT; ppp_data->ncp.s_msid = PPP_MSID_DEFAULT; ppp_data->ncp.r_hc = PPP_HC_DEFAULT; ppp_data->ncp.r_msid = PPP_MSID_DEFAULT; ppp_data->ncp.n_ip = PPP_IP_DEFAULT; ppp_data->ncp.n_pdns = PPP_PDNS_DEFAULT; ppp_data->ncp.n_sdns = PPP_SDNS_DEFAULT; ppp_data->ncp.n_gateway = PPP_GATEWAY_DEFAULT; ppp_data->ncp.s_rejected = 0; ppp_data->ncp.nscri = 0; ppp_data->ncp.nstri = 0; ppp_data->ncp.nscji = 0; ppp_data->ncp.scr=FALSE; ppp_data->ncp.str=FALSE; ppp_data->ncp.rcr=FALSE; INIT_STATE( PPP_SERVICE_NCP , NCP_STATE ); } /* ncp_init() */ /* +------------------------------------------------------------------------------ | Function : ncp_get_values +------------------------------------------------------------------------------ | Description : The function ncp_get_values() returns negotiated values | | Parameters : ptr_hc - returns IP Header Compression | ptr_msid - returns max slot identifier | ptr_ip - returns IP address | ptr_pdns - returns primary DNS server address | ptr_pdns - returns secondary DNS server address | +------------------------------------------------------------------------------ */ GLOBAL void ncp_get_values (UBYTE* ptr_hc, UBYTE* ptr_msid, ULONG* ptr_ip, ULONG* ptr_pdns, ULONG* ptr_sdns) { TRACE_FUNCTION( "ncp_get_values" ); *ptr_hc = ppp_data->ncp.r_hc; if(ppp_data->ncp.r_msid < ppp_data->ncp.s_msid) *ptr_msid = ppp_data->ncp.r_msid; else *ptr_msid = ppp_data->ncp.s_msid; *ptr_ip = ppp_data->ncp.n_ip; *ptr_pdns = ppp_data->ncp.n_pdns; *ptr_sdns = ppp_data->ncp.n_sdns; } /* ncp_get_values() */ /* +------------------------------------------------------------------------------ | Function : ncp_get_scr +------------------------------------------------------------------------------ | Description : The function ncp_get_scr() creates a NCP Configure Request | packet. | | Parameters : ptr_packet - returns the Configure Request packet | THE MEMORY FOR THE PACKET WILL ALLOCATED BY | THIS FUNCTION | +------------------------------------------------------------------------------ */ GLOBAL void ncp_get_scr (T_desc2** ptr_packet) { T_desc2* ret_desc; USHORT len_pos; USHORT pos; TRACE_FUNCTION( "ncp_get_scr" ); /* * Allocate the necessary size for the data descriptor. The size is * calculated as follows: * - take the size of a descriptor structure * - subtract one because of the array buffer[1] to get the size of * descriptor control information * - add number of octets of descriptor data */ MALLOC (ret_desc, (USHORT)(sizeof(T_desc2) - 1 + NCP_CONF_REQ_LENGTH_MAX)); /* * fill the packet */ ret_desc->next=(ULONG)NULL; pos=0; /* * Code field */ ret_desc->buffer[pos]=CODE_CONF_REQ; pos++; /* * Identifier field */ ret_desc->buffer[pos]=ppp_data->ncp.nscri;/*lint !e415 access of out-of-bounds pointer */ pos++; /* * Length field (store the position) */ len_pos=pos; pos++; pos++; /* * Header Compression Protocol (only server mode) */ if(((ppp_data->ncp.s_rejected & (1UL << MASK_TYPE_HC)) EQ 0) && (ppp_data->ncp.s_hc NEQ PPP_HC_DEFAULT)) { if(ppp_data->ncp.s_hc EQ PPP_HC_VJ) { ret_desc->buffer[pos] = TYPE_HC;/*lint !e415 !e416 access of out-of-bounds pointer */ pos++; ret_desc->buffer[pos] = LENGTH_HC_VJ;/*lint !e415 !e416 access of out-of-bounds pointer */ pos++; ret_desc->buffer[pos] = PROTOCOL_VJ_MSB;/*lint !e415 !e416 access of out-of-bounds pointer */ pos++; ret_desc->buffer[pos] = PROTOCOL_VJ_LSB;/*lint !e415 !e416 access of out-of-bounds pointer */ pos++; ret_desc->buffer[pos] = ppp_data->ncp.s_msid;/*lint !e415 !e416 access of out-of-bounds pointer */ pos++; ret_desc->buffer[pos] = PPP_CSID_YES;/*lint !e415 !e416 access of out-of-bounds pointer */ pos++; } /* * include additional header compression protocols */ } /* * IP Address (only client mode) */ if(((ppp_data->ncp.s_rejected & (1UL << MASK_TYPE_IP)) EQ 0) && (ppp_data->mode EQ PPP_CLIENT)) { ret_desc->buffer[pos]=TYPE_IP;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=LENGTH_IP;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)(ppp_data->ncp.n_ip >> 24);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)((ppp_data->ncp.n_ip >> 16) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)((ppp_data->ncp.n_ip >> 8) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)(ppp_data->ncp.n_ip & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; } /* * Gateway Address (only server mode) */ if(((ppp_data->ncp.s_rejected & (1UL << MASK_TYPE_IP)) EQ 0) && (ppp_data->mode EQ PPP_SERVER) && (ppp_data->ncp.n_gateway NEQ PPP_GATEWAY_DEFAULT)) { ret_desc->buffer[pos]=TYPE_IP;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=LENGTH_IP;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)(ppp_data->ncp.n_gateway >> 24);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)((ppp_data->ncp.n_gateway >> 16) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)((ppp_data->ncp.n_gateway >> 8) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)(ppp_data->ncp.n_gateway & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; } /* * Primary DNS address (only client mode) */ if(((ppp_data->ncp.s_rejected & (1UL << MASK_TYPE_PDNS)) EQ 0) && (ppp_data->mode EQ PPP_CLIENT)) { ret_desc->buffer[pos]=TYPE_PDNS;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=LENGTH_PDNS;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)(ppp_data->ncp.n_pdns >> 24);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)((ppp_data->ncp.n_pdns >> 16) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)((ppp_data->ncp.n_pdns >> 8) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)(ppp_data->ncp.n_pdns & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; } /* * Secondary DNS address (only client mode) */ if(((ppp_data->ncp.s_rejected & (1UL << MASK_TYPE_SDNS)) EQ 0) && (ppp_data->mode EQ PPP_CLIENT)) { ret_desc->buffer[pos]=TYPE_SDNS;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=LENGTH_SDNS;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)(ppp_data->ncp.n_sdns >> 24);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)((ppp_data->ncp.n_sdns >> 16) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)((ppp_data->ncp.n_sdns >> 8) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; ret_desc->buffer[pos]=(UBYTE)(ppp_data->ncp.n_sdns & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pos++; } /* * insert packet length */ ret_desc->len=pos; ret_desc->buffer[len_pos]=(UBYTE)(pos >> 8);/*lint !e415 !e416 creation and access of out-of-bounds pointer */ len_pos++; ret_desc->buffer[len_pos]=(UBYTE)(pos & 0x00ff);/*lint !e415 !e416 creation and access of out-of-bounds pointer */ /* * return the created packet */ ppp_data->ncp.scr=TRUE; *ptr_packet=ret_desc; } /* ncp_get_scr() */ /* +------------------------------------------------------------------------------ | Function : ncp_get_str +------------------------------------------------------------------------------ | Description : The function ncp_get_str() creates a NCP Terminate Request | packet. | | Parameters : ptr_packet - returns the Terminate Request packet | THE MEMORY FOR THE PACKET WILL ALLOCATED BY | THIS FUNCTION | +------------------------------------------------------------------------------ */ GLOBAL void ncp_get_str (T_desc2** ptr_packet) { T_desc2* ret_desc; USHORT pos; TRACE_FUNCTION( "ncp_get_str" ); /* * Allocate the necessary size for the data descriptor. The size is * calculated as follows: * - take the size of a descriptor structure * - subtract one because of the array buffer[1] to get the size of * descriptor control information * - add number of octets of descriptor data */ MALLOC (ret_desc, (USHORT)(sizeof(T_desc2) - 1 + NCP_TERM_REQ_LENGTH)); /* * fill the packet */ ret_desc->next = (ULONG)NULL; ret_desc->len = NCP_TERM_REQ_LENGTH; pos = 0; /* * Code field */ ret_desc->buffer[pos] = CODE_TERM_REQ; pos++; /* * Identifier field */ ret_desc->buffer[pos] = ppp_data->ncp.nstri;/*lint !e415 access of out-of-bounds pointer */ pos++; /* * Length field */ ret_desc->buffer[pos] = 0;/*lint !e415 !e416 creation and access of out-of-bounds pointer */ pos++; ret_desc->buffer[pos] = NCP_TERM_REQ_LENGTH;/*lint !e415 !e416 creation and access of out-of-bounds pointer */ pos++; /* * Data field contains the error code */ ret_desc->buffer[pos] = (U8)((ppp_data->ppp_cause >> 8) & 0x00ff);/*lint !e415 !e416 creation and access of out-of-bounds pointer */ pos++; ret_desc->buffer[pos] = (U8)((ppp_data->ppp_cause) & 0x00ff);/*lint !e415 !e416 creation and access of out-of-bounds pointer */ pos++; /* * return the created packet */ ppp_data->ncp.str = TRUE; *ptr_packet = ret_desc; } /* ncp_get_str() */ /* +------------------------------------------------------------------------------ | Function : ncp_analyze_first_ipcp +------------------------------------------------------------------------------ | Description : The function ncp_analyze_first_ipcp() determine whether the | given packet is a Configure Request packet. If so the function | analyzes the packet, sets some values in the data structure and | returns the values for header comression. | | Parameters : packet - received packet | ptr_result - returns the result of the analysis | ptr_hc - returns requested header compression | ptr_msid - returns requested max slot identifier | +------------------------------------------------------------------------------ */ GLOBAL void ncp_analyze_first_ipcp(T_desc2* packet, UBYTE* ptr_result, UBYTE* ptr_hc, UBYTE* ptr_msid) { USHORT packet_len; UBYTE type_len; USHORT pos; USHORT analyzed; USHORT protocol_hc; ULONG ip; ULONG pdns; ULONG sdns; TRACE_FUNCTION( "ncp_analyze_first_ipcp" ); /* * check whether it is a Configure Request packet and * for correct length field */ packet_len = packet->buffer[2];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ packet_len <<= 8; packet_len+= packet->buffer[3];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ if((packet->buffer[0] NEQ CODE_CONF_REQ) || (packet_len > packet->len) || (packet_len < 4)) { *ptr_result = FALSE; return; } /* * check consistence of length of packet and length of configuration options */ pos=5; while(pos < packet_len) { if(packet->buffer[pos] < 2)/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ { *ptr_result = FALSE; return; } pos+= packet->buffer[pos];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ } if((pos - 1) NEQ packet_len) { *ptr_result = FALSE; return; } /* * analyze configuration options */ ppp_data->ncp.r_hc = PPP_HC_DEFAULT; ppp_data->ncp.r_msid = PPP_MSID_DEFAULT; ppp_data->ncp.n_ip = PPP_IP_DEFAULT; ppp_data->ncp.n_pdns = PPP_PDNS_DEFAULT; ppp_data->ncp.n_sdns = PPP_SDNS_DEFAULT; pos=4; /* * analyzed is a bit field and marks all already analyzed * configuration options in order to reject all configuration options * which are listed more than once */ analyzed=0; while(pos < packet_len) { type_len=packet->buffer[pos + 1];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ switch(packet->buffer[pos])/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ { /* * yet supported configuration options */ case TYPE_HC: /* Header Compression */ protocol_hc = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ protocol_hc <<= 8; protocol_hc+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ if((analyzed & (1UL << MASK_TYPE_HC)) EQ 0) { analyzed|= (1UL << MASK_TYPE_HC); /* * max slot identifier should be between 3 and 254 * comp slot identifier may be compressed */ if((protocol_hc EQ DTI_PID_CTCP) && (packet->buffer[pos + 4] >= 3) && (packet->buffer[pos + 5] EQ PPP_CSID_YES))/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ { ppp_data->ncp.r_hc = PPP_HC_VJ; ppp_data->ncp.r_msid = packet->buffer[pos + 4];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ if(ppp_data->ncp.r_msid > 254) ppp_data->ncp.r_msid = 254; } } break; case TYPE_IP: ip = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ ip = (ip << 8); ip+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ ip = (ip << 8); ip+= packet->buffer[pos + 4];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ ip = (ip << 8); ip+= packet->buffer[pos + 5];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ if((analyzed & (1UL << MASK_TYPE_IP)) EQ 0) { analyzed|=(1UL << MASK_TYPE_IP); ppp_data->ncp.n_ip = ip; } break; case TYPE_PDNS: pdns = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pdns = (pdns << 8); pdns+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pdns = (pdns << 8); pdns+= packet->buffer[pos + 4];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pdns = (pdns << 8); pdns+= packet->buffer[pos + 5];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ if((analyzed & (1UL << MASK_TYPE_PDNS)) EQ 0) { analyzed|=(1UL << MASK_TYPE_PDNS); ppp_data->ncp.n_pdns = pdns; } break; case TYPE_SDNS: sdns = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ sdns = (sdns << 8); sdns+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ sdns = (sdns << 8); sdns+= packet->buffer[pos + 4];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ sdns = (sdns << 8); sdns+= packet->buffer[pos + 5];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ if((analyzed & (1UL << MASK_TYPE_SDNS)) EQ 0) { analyzed|=(1UL << MASK_TYPE_SDNS); ppp_data->ncp.n_sdns = sdns; } break; default: /* * not supported configuration options are not analysed */ break; } pos+= type_len; } /* * all configuration options analyzed */ *ptr_hc = ppp_data->ncp.r_hc; *ptr_msid = ppp_data->ncp.r_msid; *ptr_result = TRUE; } /* ncp_analyze_first_ipcp() */ /* +------------------------------------------------------------------------------ | Function : ncp_fill_out_packet +------------------------------------------------------------------------------ | Description : The function ncp_fill_out_packet() puts a IPCP packet into | the protocol configuration list | | Parameters : pco_buf - pco list buffer | ptr_pos - position where to write the IPCP packet, this value | must get back to the calling funtion | +------------------------------------------------------------------------------ */ GLOBAL void ncp_fill_out_packet (UBYTE pco_buf[], USHORT* ptr_pos) { USHORT pos; USHORT len_pos1, len_pos2; TRACE_FUNCTION( "ncp_fill_out_packet" ); if((ppp_data->pco_mask & PPP_PCO_MASK_IPCP_HC) || (ppp_data->pco_mask & PPP_PCO_MASK_IPCP_IP) || (ppp_data->pco_mask & PPP_PCO_MASK_IPCP_PDNS) || (ppp_data->pco_mask & PPP_PCO_MASK_IPCP_SDNS)) { pos=*ptr_pos; /* * create the Configure-Request packet */ /* * Protocol ID */ pco_buf[pos] = PROTOCOL_IPCP_MSB; pos++; pco_buf[pos] = PROTOCOL_IPCP_LSB; pos++; /* * Length of Protocol contents (store the position) */ len_pos1 = pos; pos++; /* * Code field */ pco_buf[pos] = CODE_CONF_REQ; pos++; /* * Identifier field (some value) */ pco_buf[pos] = 1; pos++; /* * Length field (store the position) */ len_pos2 = pos; pos++; pos++; if(ppp_data->pco_mask & PPP_PCO_MASK_IPCP_HC) { /* * Header Compression */ if(ppp_data->ncp.r_hc EQ PPP_HC_VJ) { pco_buf[pos] = TYPE_HC; pos++; pco_buf[pos] = LENGTH_HC_VJ; pos++; pco_buf[pos] = PROTOCOL_VJ_MSB; pos++; pco_buf[pos] = PROTOCOL_VJ_LSB; pos++; pco_buf[pos] = ppp_data->ncp.r_msid; pos++; pco_buf[pos] = PPP_CSID_YES; pos++; } } if(ppp_data->pco_mask & PPP_PCO_MASK_IPCP_IP) { /* * IP Address */ pco_buf[pos] = TYPE_IP; pos++; pco_buf[pos] = LENGTH_IP; pos++; pco_buf[pos] = (UBYTE)(ppp_data->ncp.n_ip >> 24); pos++; pco_buf[pos] = (UBYTE)((ppp_data->ncp.n_ip >> 16) & 0x000000ff); pos++; pco_buf[pos] = (UBYTE)((ppp_data->ncp.n_ip >> 8) & 0x000000ff); pos++; pco_buf[pos] = (UBYTE)(ppp_data->ncp.n_ip & 0x000000ff); pos++; } if(ppp_data->pco_mask & PPP_PCO_MASK_IPCP_PDNS) { /* * primary DNS Address */ pco_buf[pos] = TYPE_PDNS; pos++; pco_buf[pos] = LENGTH_PDNS; pos++; pco_buf[pos] = (UBYTE)(ppp_data->ncp.n_pdns >> 24); pos++; pco_buf[pos] = (UBYTE)((ppp_data->ncp.n_pdns >> 16) & 0x000000ff); pos++; pco_buf[pos] = (UBYTE)((ppp_data->ncp.n_pdns >> 8) & 0x000000ff); pos++; pco_buf[pos] = (UBYTE)(ppp_data->ncp.n_pdns & 0x000000ff); pos++; } if(ppp_data->pco_mask & PPP_PCO_MASK_IPCP_SDNS) { /* * secondary DNS Address */ pco_buf[pos] = TYPE_SDNS; pos++; pco_buf[pos] = LENGTH_SDNS; pos++; pco_buf[pos] = (UBYTE)(ppp_data->ncp.n_sdns >> 24); pos++; pco_buf[pos] = (UBYTE)((ppp_data->ncp.n_sdns >> 16) & 0x000000ff); pos++; pco_buf[pos] = (UBYTE)((ppp_data->ncp.n_sdns >> 8) & 0x000000ff); pos++; pco_buf[pos] = (UBYTE)(ppp_data->ncp.n_sdns & 0x000000ff); pos++; } /* * insert packet length */ pco_buf[len_pos2] = 0; len_pos2++; pco_buf[len_pos2] = (UBYTE)(pos - len_pos2 + 3); /* * insert Length of Protocol Contents */ pco_buf[len_pos1] = pco_buf[len_pos2]; /* * return new position */ *ptr_pos=pos; } if(ppp_data->pco_mask & PPP_PCO_MASK_IPCP_GATEWAY) { pos=*ptr_pos; /* * create the Configure-NAK packet */ /* * Protocol ID */ pco_buf[pos] = PROTOCOL_IPCP_MSB; pos++; pco_buf[pos] = PROTOCOL_IPCP_LSB; pos++; /* * Length of Protocol contents (store the position) */ len_pos1 = pos; pos++; /* * Code field */ pco_buf[pos] = CODE_CONF_NAK; pos++; /* * Identifier field (some value) */ pco_buf[pos] = 1; pos++; /* * Length field (store the position) */ len_pos2 = pos; pos++; pos++; /* * dynamic Gateway Address */ pco_buf[pos] = TYPE_IP; pos++; pco_buf[pos] = LENGTH_IP; pos++; pco_buf[pos] = 0; pos++; pco_buf[pos] = 0; pos++; pco_buf[pos] = 0; pos++; pco_buf[pos] = 0; pos++; /* * insert packet length */ pco_buf[len_pos2] = 0; len_pos2++; pco_buf[len_pos2] = (UBYTE)(pos - len_pos2 + 3); /* * insert Length of Protocol Contents */ pco_buf[len_pos1] = pco_buf[len_pos2]; /* * return new position */ *ptr_pos=pos; } } /* ncp_fill_out_packet() */ /* +------------------------------------------------------------------------------ | Function : ncp_analyze_pco +------------------------------------------------------------------------------ | Description : The function ncp_analyze_pco() analyzes the return packet from | PDP activation and determines the primary and secondary DNS | address and the Gateway address. | | Parameters : pco_buf - pointer to the protocol configuration options | pos - position where the IPCP packet starts | ptr_dns1 - returns primary DNS address | ptr_dns2 - returns secondary DNS address | ptr_gateway - returns Gateway address | +------------------------------------------------------------------------------ */ GLOBAL void ncp_analyze_pco (UBYTE pco_buf[], USHORT pos, ULONG* ptr_dns1, ULONG* ptr_dns2, ULONG* ptr_gateway) { USHORT packet_len; USHORT start_pos; UBYTE type_len; USHORT analyzed; ULONG pdns; ULONG sdns; ULONG gateway; TRACE_FUNCTION( "ncp_analyze_pco" ); /* * check for correct length field */ pos+= 2; packet_len = pco_buf[pos + 3]; packet_len <<= 8; packet_len+= pco_buf[pos + 4]; if(packet_len NEQ pco_buf[pos]) return; pos++; /* * check of code field */ if((pco_buf[pos] NEQ CODE_CONF_REQ) && (pco_buf[pos] NEQ CODE_CONF_NAK) && (pco_buf[pos] NEQ CODE_CONF_ACK)) return; /* * analyze configuration options */ start_pos = pos; pos+= 4; /* * analyzed is a bit field and marks all already analyzed * configuration options in order to determine configuration options * which are listed more than once */ analyzed=0; while((pos - start_pos) < packet_len) { type_len=pco_buf[pos + 1]; switch(pco_buf[pos]) { /* * search for IP configuration option */ case TYPE_IP: gateway = pco_buf[pos + 2]; gateway = (gateway << 8); gateway+= pco_buf[pos + 3]; gateway = (gateway << 8); gateway+= pco_buf[pos + 4]; gateway = (gateway << 8); gateway+= pco_buf[pos + 5]; if(((analyzed & (1UL << MASK_TYPE_IP)) EQ 0) && (*ptr_gateway EQ PPP_GATEWAY_DEFAULT) && (pco_buf[start_pos] EQ CODE_CONF_REQ)) { analyzed|=(1UL << MASK_TYPE_IP); *ptr_gateway = gateway; } break; /* * search for DNS configuration options */ case TYPE_PDNS: pdns = pco_buf[pos + 2]; pdns = (pdns << 8); pdns+= pco_buf[pos + 3]; pdns = (pdns << 8); pdns+= pco_buf[pos + 4]; pdns = (pdns << 8); pdns+= pco_buf[pos + 5]; if(((analyzed & (1UL << MASK_TYPE_PDNS)) EQ 0) && (*ptr_dns1 EQ PPP_PDNS_DEFAULT) && ((pco_buf[start_pos] EQ CODE_CONF_NAK) || (pco_buf[start_pos] EQ CODE_CONF_ACK))) { analyzed|=(1UL << MASK_TYPE_PDNS); *ptr_dns1 = pdns; } break; case TYPE_SDNS: sdns = pco_buf[pos + 2]; sdns = (sdns << 8); sdns+= pco_buf[pos + 3]; sdns = (sdns << 8); sdns+= pco_buf[pos + 4]; sdns = (sdns << 8); sdns+= pco_buf[pos + 5]; if(((analyzed & (1UL << MASK_TYPE_SDNS)) EQ 0) && (*ptr_dns2 EQ PPP_SDNS_DEFAULT) && ((pco_buf[start_pos] EQ CODE_CONF_NAK) || (pco_buf[start_pos] EQ CODE_CONF_ACK))) { analyzed|=(1UL << MASK_TYPE_SDNS); *ptr_dns2 = sdns; } break; default: /* * other configuration options are not analysed */ break; } pos+= type_len; } } /* ncp_analyze_pco() */ /* +------------------------------------------------------------------------------ | Function : ncp_rcr +------------------------------------------------------------------------------ | Description : The function ncp_rcr() analyzes the given | Configure Request packet and returns either FORWARD_RCRP or | FORWARD_RCRN depend on the result of the analysis. | The packet pointer points to an appropriate response packet. | | Parameters : ptr_packet - pointer to a Configure Request packet | forward - returns result of analysis | +------------------------------------------------------------------------------ */ GLOBAL void ncp_rcr (T_desc2** ptr_packet, UBYTE* isnew, UBYTE* forward) { T_desc2* packet; USHORT packet_len; UBYTE type_len; USHORT pos; USHORT copy_pos; USHORT analyzed; UBYTE code_ret; UBYTE error_found; USHORT protocol_hc; UBYTE csid; ULONG ip; ULONG pdns; ULONG sdns; TRACE_FUNCTION( "ncp_rcr" ); /* * check for correct length field */ packet = *ptr_packet; packet_len = packet->buffer[2];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ packet_len <<= 8; packet_len+= packet->buffer[3];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ if((packet_len > packet->len) || (packet_len < 4)) { *forward=FORWARD_DISCARD; return; } /* * check consistence of length of packet and length of configuration options */ pos=5; while(pos < packet_len) { if(packet->buffer[pos] < 2)/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ { *forward=FORWARD_DISCARD; return; } pos += packet->buffer[pos];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ } if((pos - 1) NEQ packet_len) { *forward=FORWARD_DISCARD; return; } /* * check whether it is a new identifier */ *isnew=TRUE; if((ppp_data->ncp.rcr) && (ppp_data->ncp.lrcri EQ packet->buffer[1]))/*lint !e415 access of out-of-bounds pointer */ *isnew=FALSE; ppp_data->ncp.lrcri=packet->buffer[1];/*lint !e415 access of out-of-bounds pointer */ ppp_data->ncp.rcr=TRUE; /* * analyze configuration options */ ppp_data->ncp.r_hc = PPP_HC_DEFAULT; ppp_data->ncp.r_msid = PPP_MSID_DEFAULT; csid = 0; if(ppp_data->mode EQ PPP_SERVER) { ppp_data->ncp.n_ip = PPP_IP_DEFAULT; ppp_data->ncp.n_pdns = PPP_PDNS_DEFAULT; ppp_data->ncp.n_sdns = PPP_SDNS_DEFAULT; } pos=4; /* * position where NAKed or Rejected configuration options are copied to */ copy_pos=4; /* * code_ret contains actually the status of analysis * states are CODE_CONF_ACK, CODE_CONF_NAK and CODE_CONF_REJ * this state are also values for the Code-field in the return packet */ code_ret=CODE_CONF_ACK; /* * analyzed is a bit field and marks all already analyzed * configuration options in order to reject all configuration options * which are listed more than once */ analyzed=0; while(pos < packet_len) { type_len=packet->buffer[pos + 1];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ switch(packet->buffer[pos])/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ { /* * yet supported configuration options */ case TYPE_HC: /* Header Compression */ protocol_hc = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ protocol_hc <<= 8; protocol_hc+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ if(protocol_hc EQ DTI_PID_CTCP) { ppp_data->ncp.r_hc = PPP_HC_VJ; ppp_data->ncp.r_msid = packet->buffer[pos + 4];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ csid = packet->buffer[pos + 5];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ } switch(code_ret) { case CODE_CONF_ACK: if(((analyzed & (1UL << MASK_TYPE_HC)) EQ 0) && (ppp_data->ncp.r_hc EQ ppp_data->ncp.req_hc)) { if((ppp_data->ncp.r_hc EQ PPP_HC_VJ) && (type_len EQ LENGTH_HC_VJ)) { if((ppp_data->mode EQ PPP_SERVER) && (ppp_data->ncp.r_msid >= ppp_data->ncp.s_msid) && (csid EQ PPP_CSID_YES) && (ppp_data->ncp.s_hc EQ PPP_HC_VJ)) { analyzed|=(1UL << MASK_TYPE_HC); pos+= LENGTH_HC_VJ; break; } /* * include here negotiation in client mode */ } /* * include here additional header compression protocols */ } code_ret=CODE_CONF_NAK; /* fall through */ case CODE_CONF_NAK: /* * this configuration option will NAKed only if the compression * protocol is not Van Jacobson Header Compression */ if(((analyzed & (1UL << MASK_TYPE_HC)) EQ 0) && (ppp_data->ncp.req_hc NEQ PPP_HC_DEFAULT) && (ppp_data->ncp.s_hc EQ PPP_HC_VJ) && ((protocol_hc NEQ DTI_PID_CTCP) || (type_len NEQ LENGTH_HC_VJ) || ((ppp_data->ncp.r_msid >= ppp_data->ncp.s_msid) && (csid EQ PPP_CSID_YES)))) { analyzed|= (1UL << MASK_TYPE_HC); error_found = FALSE; /* * this implementation is only for server mode */ if(type_len < LENGTH_HC_VJ) { T_desc2* temp_desc; /* * create a new larger packet and copy the content * of the old packet into the new */ MALLOC (temp_desc, (USHORT)(sizeof(T_desc2) - 1 + packet_len + LENGTH_HC_VJ - type_len)); temp_desc->next = packet->next; temp_desc->len = packet_len + LENGTH_HC_VJ - type_len; memcpy(temp_desc->buffer, packet->buffer, pos);/*lint !e669 !e670 possible data overrun*/ memcpy(&temp_desc->buffer[pos + LENGTH_HC_VJ - type_len], &packet->buffer[pos], packet_len - pos);/*lint !e662 !e669 !e670 possible creation of out-of-bounds pointer*/ arb_discard_packet(packet); packet_len+= (LENGTH_HC_VJ - type_len); pos += (LENGTH_HC_VJ - type_len); packet = temp_desc; error_found = TRUE; } else if(ppp_data->ncp.r_hc NEQ PPP_HC_VJ) { error_found = TRUE; } else if(type_len > LENGTH_HC_VJ) { error_found = TRUE; } if(error_found EQ TRUE) { packet->buffer[copy_pos] = TYPE_HC;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos] = LENGTH_HC_VJ;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos] = PROTOCOL_VJ_MSB;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos] = PROTOCOL_VJ_LSB;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos] = ppp_data->ncp.req_msid;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos] = PPP_CSID_YES;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; } pos+= type_len; break; } code_ret = CODE_CONF_REJ; copy_pos = 4; /* fall through */ case CODE_CONF_REJ: if(((analyzed & (1UL << MASK_TYPE_HC)) EQ 0) && (ppp_data->ncp.req_hc NEQ PPP_HC_DEFAULT) && (ppp_data->ncp.s_hc EQ PPP_HC_VJ) && ((ppp_data->ncp.s_rejected & (1UL << MASK_TYPE_HC)) EQ 0) && ((protocol_hc NEQ DTI_PID_CTCP) || (type_len NEQ LENGTH_HC_VJ) || ((ppp_data->ncp.r_msid >= ppp_data->ncp.s_msid) && (csid EQ PPP_CSID_YES)))) { analyzed|= (1UL << MASK_TYPE_HC); pos+= type_len; break; } /* * set s_hc to default because we reject this configuration option */ ppp_data->ncp.s_hc = PPP_HC_DEFAULT; while(type_len > 0) { packet->buffer[copy_pos]=packet->buffer[pos];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; pos++; type_len--; } break; default: TRACE_ERROR("Packet return code invalid"); break; } break; case TYPE_IP: ip = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ ip = (ip << 8); ip+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ ip = (ip << 8); ip+= packet->buffer[pos + 4];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ ip = (ip << 8); ip+= packet->buffer[pos + 5];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ switch(code_ret) { case CODE_CONF_ACK: if(((analyzed & (1UL << MASK_TYPE_IP)) EQ 0) && (type_len EQ LENGTH_IP)) { if((ppp_data->mode EQ PPP_SERVER) && (((ip EQ ppp_data->ncp.req_ip) && (ppp_data->ncp.req_ip NEQ PPP_IP_DEFAULT)) || ((ip NEQ PPP_IP_DEFAULT) && (ppp_data->ncp.req_ip EQ PPP_IP_DEFAULT)))) { analyzed|=(1UL << MASK_TYPE_IP); ppp_data->ncp.n_ip = ip; pos+=LENGTH_IP; break; } else if((ppp_data->mode EQ PPP_CLIENT) && (ip NEQ PPP_IP_DEFAULT)) { /* * accept Gateway address */ analyzed|=(1UL << MASK_TYPE_IP); ppp_data->ncp.n_gateway = ip; pos+=LENGTH_IP; break; } } code_ret=CODE_CONF_NAK; /* fall through */ case CODE_CONF_NAK: /* * this option will be rejected in following cases: * - occurence more than once * - in client mode if received IP is dynamic * - in server mode if received and requested IP are dynamic */ if(((analyzed & (1UL << MASK_TYPE_IP)) EQ 0) && (((ppp_data->mode EQ PPP_SERVER) && ((ip NEQ ppp_data->ncp.req_ip) || (ppp_data->ncp.req_ip NEQ PPP_IP_DEFAULT))) || ((ppp_data->mode EQ PPP_CLIENT) && (ip NEQ PPP_IP_DEFAULT)))) { analyzed|=(1UL << MASK_TYPE_IP); error_found=FALSE; if(type_len < LENGTH_IP) { T_desc2* temp_desc; /* * create a new larger packet and copy the content * of the old packet into the new */ MALLOC (temp_desc, (USHORT)(sizeof(T_desc2) - 1 + packet_len + LENGTH_IP - type_len)); temp_desc->next = packet->next; temp_desc->len = packet_len + LENGTH_IP - type_len; memcpy(temp_desc->buffer, packet->buffer, pos);/*lint !e669 !e670 Possible data overrun*/ memcpy(&temp_desc->buffer[pos + LENGTH_IP - type_len], &packet->buffer[pos], packet_len - pos);/*lint !e662 !e669 !e670 possible creation of out-of-bounds pointer*/ arb_discard_packet(packet); packet_len += (LENGTH_IP - type_len); pos += (LENGTH_IP - type_len); packet = temp_desc; error_found = TRUE; } else if((ip NEQ ppp_data->ncp.req_ip) && (ppp_data->ncp.req_ip NEQ PPP_IP_DEFAULT) && (ppp_data->mode EQ PPP_SERVER)) { error_found=TRUE; } else if(type_len > LENGTH_IP) { error_found=TRUE; } if(error_found EQ TRUE) { packet->buffer[copy_pos]=TYPE_IP;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=LENGTH_IP;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)(ppp_data->ncp.req_ip >> 24);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)((ppp_data->ncp.req_ip >> 16) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)((ppp_data->ncp.req_ip >> 8) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)(ppp_data->ncp.req_ip & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; } pos+= type_len; break; } code_ret = CODE_CONF_REJ; copy_pos = 4; /* fall through */ case CODE_CONF_REJ: if(((analyzed & (1UL << MASK_TYPE_IP)) EQ 0) && (((ppp_data->mode EQ PPP_SERVER) && ((ip NEQ ppp_data->ncp.req_ip) || (ppp_data->ncp.req_ip NEQ PPP_IP_DEFAULT))) || ((ppp_data->mode EQ PPP_CLIENT) && (ip NEQ PPP_IP_DEFAULT)))) { analyzed|=(1UL << MASK_TYPE_IP); pos+=type_len; break; } while(type_len > 0) { packet->buffer[copy_pos]=packet->buffer[pos];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; pos++; type_len--; } break; default: TRACE_ERROR("Packet return code invalid"); break; } break; case TYPE_PDNS: /* only in server mode allowed */ pdns = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pdns = (pdns << 8); pdns+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pdns = (pdns << 8); pdns+= packet->buffer[pos + 4];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pdns = (pdns << 8); pdns+= packet->buffer[pos + 5];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ switch(code_ret) { case CODE_CONF_ACK: if(((analyzed & (1UL << MASK_TYPE_PDNS)) EQ 0) && (ppp_data->mode EQ PPP_SERVER) && (type_len EQ LENGTH_PDNS) && (((pdns EQ ppp_data->ncp.req_pdns) && (ppp_data->ncp.req_pdns NEQ PPP_PDNS_DEFAULT)) || ((pdns NEQ PPP_PDNS_DEFAULT) && (ppp_data->ncp.req_pdns EQ PPP_PDNS_DEFAULT)))) { analyzed|=(1UL << MASK_TYPE_PDNS); ppp_data->ncp.n_pdns = pdns; pos+= LENGTH_PDNS; break; } code_ret=CODE_CONF_NAK; /* fall through */ case CODE_CONF_NAK: /* * this option will be rejected in following cases: * - occurence more than once * - client mode * - received and requested PDNS are dynamic */ if(((analyzed & (1UL << MASK_TYPE_PDNS)) EQ 0) && (ppp_data->mode EQ PPP_SERVER) && ((pdns NEQ ppp_data->ncp.req_pdns) || (ppp_data->ncp.req_pdns NEQ PPP_PDNS_DEFAULT))) { analyzed|=(1UL << MASK_TYPE_PDNS); error_found=FALSE; if(type_len < LENGTH_PDNS) { T_desc2* temp_desc; /* * create a new larger packet and copy the content * of the old packet into the new */ MALLOC (temp_desc, (USHORT)(sizeof(T_desc2) - 1 + packet_len + LENGTH_PDNS - type_len)); temp_desc->next = packet->next; temp_desc->len = packet_len + LENGTH_PDNS - type_len; memcpy(temp_desc->buffer, packet->buffer, pos);/*lint !e669 !e670 Possible data overrun*/ memcpy(&temp_desc->buffer[pos + LENGTH_PDNS - type_len], &packet->buffer[pos], packet_len - pos);/*lint !e662 !e669 !e670 possible creation of out-of-bounds pointer*/ arb_discard_packet(packet); packet_len += (LENGTH_PDNS - type_len); pos += (LENGTH_PDNS - type_len); packet = temp_desc; error_found = TRUE; } else if((pdns NEQ ppp_data->ncp.req_pdns) && (ppp_data->ncp.req_pdns NEQ PPP_PDNS_DEFAULT)) { error_found=TRUE; } else if(type_len > LENGTH_PDNS) { error_found=TRUE; } if(error_found EQ TRUE) { packet->buffer[copy_pos]=TYPE_PDNS;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=LENGTH_PDNS;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)(ppp_data->ncp.req_pdns >> 24);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)((ppp_data->ncp.req_pdns >> 16) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)((ppp_data->ncp.req_pdns >> 8) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)(ppp_data->ncp.req_pdns & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; } pos+= type_len; break; } code_ret = CODE_CONF_REJ; copy_pos = 4; /* fall through */ case CODE_CONF_REJ: if(((analyzed & (1UL << MASK_TYPE_PDNS)) EQ 0) && (ppp_data->mode EQ PPP_SERVER) && ((pdns NEQ ppp_data->ncp.req_pdns) || (ppp_data->ncp.req_pdns NEQ PPP_PDNS_DEFAULT))) { analyzed|=(1UL << MASK_TYPE_PDNS); pos+=type_len; break; } while(type_len > 0) { packet->buffer[copy_pos]=packet->buffer[pos];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; pos++; type_len--; } break; default: TRACE_ERROR("Packet return code invalid"); break; } break; case TYPE_SDNS: /* only in server mode allowed */ sdns = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ sdns = (sdns << 8); sdns+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ sdns = (sdns << 8); sdns+= packet->buffer[pos + 4];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ sdns = (sdns << 8); sdns+= packet->buffer[pos + 5];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ switch(code_ret) { case CODE_CONF_ACK: if(((analyzed & (1UL << MASK_TYPE_SDNS)) EQ 0) && (ppp_data->mode EQ PPP_SERVER) && (type_len EQ LENGTH_SDNS) && (((sdns EQ ppp_data->ncp.req_sdns) && (ppp_data->ncp.req_sdns NEQ PPP_SDNS_DEFAULT)) || ((sdns NEQ PPP_SDNS_DEFAULT) && (ppp_data->ncp.req_sdns EQ PPP_SDNS_DEFAULT)))) { analyzed|=(1UL << MASK_TYPE_SDNS); ppp_data->ncp.n_sdns = sdns; pos+= LENGTH_SDNS; break; } code_ret=CODE_CONF_NAK; /* fall through */ case CODE_CONF_NAK: /* * this option will be rejected in following cases: * - occurence more than once * - client mode * - received and requested SDNS are dynamic */ if(((analyzed & (1UL << MASK_TYPE_SDNS)) EQ 0) && (ppp_data->mode EQ PPP_SERVER) && ((sdns NEQ ppp_data->ncp.req_sdns) || (ppp_data->ncp.req_sdns NEQ PPP_SDNS_DEFAULT))) { analyzed|=(1UL << MASK_TYPE_SDNS); error_found=FALSE; if(type_len < LENGTH_SDNS) { T_desc2* temp_desc; /* * create a new larger packet and copy the content * of the old packet into the new */ MALLOC (temp_desc, (USHORT)(sizeof(T_desc2) - 1 + packet_len + LENGTH_SDNS - type_len)); temp_desc->next = packet->next; temp_desc->len = packet_len + LENGTH_SDNS - type_len; memcpy(temp_desc->buffer, packet->buffer, pos);/*lint !e669 !e670 Possible data overrun*/ memcpy(&temp_desc->buffer[pos + LENGTH_SDNS - type_len], &packet->buffer[pos], packet_len - pos);/*lint !e662 !e669 !e670 possible creation of out-of-bounds pointer*/ arb_discard_packet(packet); packet_len += (LENGTH_SDNS - type_len); pos += (LENGTH_SDNS - type_len); packet = temp_desc; error_found = TRUE; } else if((sdns NEQ ppp_data->ncp.req_sdns) && (ppp_data->ncp.req_sdns NEQ PPP_SDNS_DEFAULT)) { error_found=TRUE; } else if(type_len > LENGTH_SDNS) { error_found=TRUE; } if(error_found EQ TRUE) { packet->buffer[copy_pos]=TYPE_SDNS;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=LENGTH_SDNS;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)(ppp_data->ncp.req_sdns >> 24);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)((ppp_data->ncp.req_sdns >> 16) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)((ppp_data->ncp.req_sdns >> 8) & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos]=(UBYTE)(ppp_data->ncp.req_sdns & 0x000000ff);/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; } pos+= type_len; break; } code_ret = CODE_CONF_REJ; copy_pos = 4; /* fall through */ case CODE_CONF_REJ: if(((analyzed & (1UL << MASK_TYPE_SDNS)) EQ 0) && (ppp_data->mode EQ PPP_SERVER) && ((sdns NEQ ppp_data->ncp.req_sdns) || (ppp_data->ncp.req_sdns NEQ PPP_SDNS_DEFAULT))) { analyzed|=(1UL << MASK_TYPE_SDNS); pos+=type_len; break; } while(type_len > 0) { packet->buffer[copy_pos]=packet->buffer[pos];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; pos++; type_len--; } break; default: TRACE_ERROR("Packet return code invalid"); break; } break; default: switch(code_ret) { case CODE_CONF_ACK: case CODE_CONF_NAK: code_ret=CODE_CONF_REJ; copy_pos=4; /* fall through */ default: while(type_len > 0) { packet->buffer[copy_pos]=packet->buffer[pos];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; pos++; type_len--; } break; } } } if(((analyzed & (1UL << MASK_TYPE_HC)) EQ 0) && (ppp_data->ncp.s_hc EQ PPP_HC_VJ) && (ppp_data->ncp.req_hc EQ PPP_HC_VJ) && (code_ret NEQ CODE_CONF_REJ)) { T_desc2* temp_desc; /* * add header compression to the configure Nak packet */ code_ret = CODE_CONF_NAK; /* * create a new larger packet and copy the content * of the old packet into the new */ MALLOC (temp_desc, (USHORT)(sizeof(T_desc2) - 1 + packet_len + LENGTH_HC_VJ)); temp_desc->next = packet->next; temp_desc->len = packet_len + LENGTH_HC_VJ; memcpy(temp_desc->buffer, packet->buffer, copy_pos);/*lint !e669 !e670 Possible data overrun*/ arb_discard_packet(packet); packet_len+= LENGTH_HC_VJ; packet = temp_desc; /* * insert header compression option */ packet->buffer[copy_pos] = TYPE_HC;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos] = LENGTH_HC_VJ;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos] = PROTOCOL_VJ_MSB;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos] = PROTOCOL_VJ_LSB;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos] = ppp_data->ncp.req_msid;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; packet->buffer[copy_pos] = PPP_CSID_YES;/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ copy_pos++; } /* * set new Code field in return packet */ packet->buffer[0]=code_ret; *ptr_packet=packet; if(copy_pos > 4) { /* * some configuration options are not acceptable */ *forward=FORWARD_RCRN; /* * set new Length field */ packet->len=copy_pos; packet->buffer[2]=(UBYTE)(copy_pos >> 8);/*lint !e415 !e416 creation and access of out-of-bounds pointer */ packet->buffer[3]=(UBYTE)(copy_pos & 0x00ff);/*lint !e415 !e416 creation and access of out-of-bounds pointer */ return; } /* * all configuration options are acceptable */ *forward=FORWARD_RCRP; } /* ncp_rcr() */ /* +------------------------------------------------------------------------------ | Function : ncp_rca +------------------------------------------------------------------------------ | Description : The function ncp_rca() checks whether the given | Configure Ack packet is valid and if so it returns | FORWARD_RCA. Otherwise it returns FORWARD_DISCARD. | | Parameters : packet - Configure Ack packet | forward - returns result of analysis | +------------------------------------------------------------------------------ */ GLOBAL void ncp_rca (T_desc2* packet, UBYTE* forward) { USHORT packet_len; TRACE_FUNCTION( "ncp_rca" ); packet_len = packet->buffer[2];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ packet_len <<= 8; packet_len+= packet->buffer[3];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ if((packet_len < 4) || (packet_len > packet->len) || (ppp_data->ncp.scr EQ FALSE) || (packet->buffer[1] NEQ ppp_data->ncp.nscri))/*lint !e415 access of out-of-bounds pointer */ { /* * invalid packet */ *forward=FORWARD_DISCARD; return; } /* * acceptable packet */ arb_discard_packet(packet); ppp_data->ncp.nscri++; *forward=FORWARD_RCA; } /* ncp_rca() */ /* +------------------------------------------------------------------------------ | Function : ncp_rcn +------------------------------------------------------------------------------ | Description : The function ncp_rcn() analyze the given | Configure Nak packet, changes some requested values and returns | FORWARD_RCN | The packet pointer points to an appropriate response packet. | | Parameters : ptr_packet - Configure Nak packet | forward - returns result of analysis | +------------------------------------------------------------------------------ */ GLOBAL void ncp_rcn (T_desc2** ptr_packet, UBYTE* forward) { T_desc2* packet; USHORT packet_len; UBYTE type_len; USHORT pos; USHORT protocol_hc; ULONG ip; ULONG pdns; ULONG sdns; TRACE_FUNCTION( "ncp_rcn" ); /* * check for correct length field */ packet = *ptr_packet; packet_len = packet->buffer[2];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ packet_len <<= 8; packet_len+= packet->buffer[3];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ if((packet_len > packet->len) || (packet_len < 4) || (ppp_data->ncp.scr EQ FALSE) || (packet->buffer[1] NEQ ppp_data->ncp.nscri))/*lint !e415 access of out-of-bounds pointer */ { /* * invalid packet */ *forward=FORWARD_DISCARD; return; } /* * check consistence of length of packet and length of configuration options */ pos=5; while(pos < packet_len) { if(packet->buffer[pos] < 2)/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ { *forward=FORWARD_DISCARD; return; } pos+= packet->buffer[pos];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ } if((pos - 1) NEQ packet_len) { *forward=FORWARD_DISCARD; return; } /* * analyze configuration options */ pos=4; while(pos < packet_len) { type_len=packet->buffer[pos + 1];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ switch(packet->buffer[pos])/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ { /* * yet supported configuration options */ case TYPE_HC: protocol_hc = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ protocol_hc <<= 8; protocol_hc+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ if((protocol_hc EQ DTI_PID_CTCP) && (ppp_data->ncp.req_hc EQ PPP_HC_VJ) && (type_len EQ LENGTH_HC_VJ)) { ppp_data->ncp.s_rejected &= ~(1UL << MASK_TYPE_HC); ppp_data->ncp.s_hc = PPP_HC_VJ; ppp_data->ncp.s_msid = ppp_data->ncp.req_msid; } break; case TYPE_IP: ip = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ ip = ip << 8; ip+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ ip = ip << 8; ip+= packet->buffer[pos + 4];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ ip = ip << 8; ip+= packet->buffer[pos + 5];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ if(type_len EQ LENGTH_IP) { ppp_data->ncp.s_rejected &= ~(1UL << MASK_TYPE_IP); if(ppp_data->mode EQ PPP_CLIENT) ppp_data->ncp.n_ip = ip; else if(ppp_data->ncp.req_gateway EQ PPP_GATEWAY_DEFAULT) ppp_data->ncp.n_gateway = ip; } break; case TYPE_PDNS: pdns = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pdns = pdns << 8; pdns+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pdns = pdns << 8; pdns+= packet->buffer[pos + 4];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ pdns = pdns << 8; pdns+= packet->buffer[pos + 5];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ if((type_len EQ LENGTH_PDNS) && (ppp_data->mode EQ PPP_CLIENT)) { ppp_data->ncp.s_rejected &= ~(1UL << MASK_TYPE_PDNS); ppp_data->ncp.n_pdns = pdns; } break; case TYPE_SDNS: sdns = packet->buffer[pos + 2];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ sdns = sdns << 8; sdns+= packet->buffer[pos + 3];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ sdns = sdns << 8; sdns+= packet->buffer[pos + 4];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ sdns = sdns << 8; sdns+= packet->buffer[pos + 5];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ if((type_len EQ LENGTH_SDNS) && (ppp_data->mode EQ PPP_CLIENT)) { ppp_data->ncp.s_rejected &= ~(1UL << MASK_TYPE_SDNS); ppp_data->ncp.n_sdns = sdns; } break; default: /* * ignore unknown configuration options */ break; } pos+= type_len; } /* * free this packet and create a new with changed configuration options */ arb_discard_packet(packet); *forward=FORWARD_RCN; ppp_data->ncp.nscri++; ncp_get_scr(&packet); *ptr_packet=packet; } /* ncp_rcn() */ /* +------------------------------------------------------------------------------ | Function : ncp_rcj +------------------------------------------------------------------------------ | Description : The function ncp_rcj() analyze the given | Configure Reject packet, marks some values as rejected and | returns FORWARD_RCJ | The packet pointer points to an appropriate response packet. | | Parameters : ptr_packet - pointer to a Configure Reject packet | forward - returns result of analysis | +------------------------------------------------------------------------------ */ GLOBAL void ncp_rcj (T_desc2** ptr_packet, UBYTE* forward) { T_desc2* packet; USHORT packet_len; UBYTE type_len; USHORT pos; TRACE_FUNCTION( "ncp_rcj" ); /* * check for correct length field */ packet = *ptr_packet; packet_len = packet->buffer[2];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ packet_len <<= 8; packet_len+= packet->buffer[3];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ if((packet_len > packet->len) || (packet_len < 4) || (ppp_data->ncp.scr EQ FALSE) || (packet->buffer[1] NEQ ppp_data->ncp.nscri))/*lint !e415 access of out-of-bounds pointer */ { /* * invalid packet */ *forward=FORWARD_DISCARD; return; } /* * check consistence of length of packet and length of configuration options */ pos=5; while(pos < packet_len) { if(packet->buffer[pos] < 2)/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ { *forward=FORWARD_DISCARD; return; } pos+= packet->buffer[pos];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ } if((pos - 1) NEQ packet_len) { *forward=FORWARD_DISCARD; return; } /* * analyze configuration options */ pos=4; while(pos < packet_len) { type_len=packet->buffer[pos + 1];/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ switch(packet->buffer[pos])/*lint !e662 !e661 possible creation and access of out-of-bounds pointer*/ { /* * yet supported configuration options */ case TYPE_HC: ppp_data->ncp.s_rejected|= (1UL << MASK_TYPE_HC); ppp_data->ncp.s_hc = PPP_HC_DEFAULT; break; case TYPE_IP: if (ppp_data->mode EQ PPP_CLIENT) { /* error: server has to support valid IP address */ *forward=FORWARD_DISCARD; return; } ppp_data->ncp.s_rejected |= (1UL << MASK_TYPE_IP); break; case TYPE_PDNS: ppp_data->ncp.s_rejected |= (1UL << MASK_TYPE_PDNS); break; case TYPE_SDNS: ppp_data->ncp.s_rejected |= (1UL << MASK_TYPE_SDNS); break; default: /* * ignore unknown configuration options */ break; } pos+= type_len; } /* * free this packet and create a new with changed configuration options */ arb_discard_packet(packet); *forward=FORWARD_RCN; ppp_data->ncp.nscri++; ncp_get_scr(&packet); *ptr_packet=packet; } /* ncp_rcj() */ /* +------------------------------------------------------------------------------ | Function : ncp_rtr +------------------------------------------------------------------------------ | Description : The function ncp_rtr() checks whether the given | Terminate Request packet is valid and if so it returns | FORWARD_RCA. Otherwise it returns FORWARD_DISCARD. | | Parameters : ptr_packet - pointer to a Terminate Request packet | forward - returns result of analysis | +------------------------------------------------------------------------------ */ GLOBAL void ncp_rtr (T_desc2** ptr_packet, UBYTE* forward) { T_desc2* packet; USHORT packet_len; TRACE_FUNCTION( "ncp_rtr" ); /* * check for correct length field */ packet = *ptr_packet; packet_len = packet->buffer[2];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ packet_len <<= 8; packet_len+= packet->buffer[3];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ if((packet_len < 4) || (packet_len > packet->len)) { *forward=FORWARD_DISCARD; return; } /* * change code field */ packet->buffer[0]=CODE_TERM_ACK; *forward=FORWARD_RTR; } /* ncp_rtr() */ /* +------------------------------------------------------------------------------ | Function : ncp_rta +------------------------------------------------------------------------------ | Description : The function ncp_rta() checks whether the given | Terminate Ack packet is valid and if so it returns | FORWARD_RTA. Otherwise it returns FORWARD_DISCARD. | | Parameters : packet - Terminate Ack packet | forward - returns result of analysis | +------------------------------------------------------------------------------ */ GLOBAL void ncp_rta (T_desc2* packet, UBYTE* forward) { USHORT packet_len; TRACE_FUNCTION( "ncp_rta" ); /* * check for correct length field */ packet_len = packet->buffer[2];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ packet_len <<= 8; packet_len+= packet->buffer[3];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ if((packet_len < 4) || (packet_len > packet->len)) { *forward=FORWARD_DISCARD; return; } if((ppp_data->ncp.str EQ TRUE) && (packet->buffer[1] NEQ ppp_data->ncp.nstri))/*lint !e415 access of out-of-bounds pointer */ { /* * invalid packet */ *forward=FORWARD_DISCARD; return; } /* * acceptable packet */ arb_discard_packet(packet); ppp_data->ncp.nstri++; *forward=FORWARD_RTA; } /* ncp_rta() */ /* +------------------------------------------------------------------------------ | Function : ncp_rxj +------------------------------------------------------------------------------ | Description : The function ncp_rxj() analyzes whether the given Code Reject | is acceptable. If not it returns FORWARD_RXJN. | | Parameters : ptr_packet - Pointer to a Code Reject packet | forward - returns result of analysis | +------------------------------------------------------------------------------ */ GLOBAL void ncp_rxj (T_desc2** ptr_packet, UBYTE* forward) { USHORT packet_len; T_desc2* packet; TRACE_FUNCTION( "ncp_rxj" ); /* * check for correct length field */ packet = *ptr_packet; packet_len = packet->buffer[2];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ packet_len <<= 8; packet_len+= packet->buffer[3];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ if((packet_len < 5) || (packet_len > packet->len)) { *forward=FORWARD_DISCARD; return; } switch(packet->buffer[4])/*lint !e415 !e416 creation and access of out-of-bounds pointer */ { case CODE_CONF_REQ: case CODE_CONF_REJ: case CODE_CONF_NAK: case CODE_CONF_ACK: case CODE_TERM_REQ: case CODE_TERM_ACK: case CODE_CODE_REJ: arb_discard_packet(packet); ncp_get_str(&packet); *ptr_packet = packet; *forward = FORWARD_RXJN; break; default: *forward=FORWARD_DISCARD; break; } } /* ncp_rxj() */ /* +------------------------------------------------------------------------------ | Function : ncp_ruc +------------------------------------------------------------------------------ | Description : The function ncp_ruc() creates a Code Reject packet and returns | FORWARD_RUC. | | Parameters : ptr_packet - packet with unknown code | forward - returns result of analysis | +------------------------------------------------------------------------------ */ GLOBAL void ncp_ruc (T_desc2** ptr_packet, UBYTE* forward) { T_desc2* packet; T_desc2* temp_desc; USHORT packet_len; TRACE_FUNCTION( "ncp_ruc" ); /* * check for correct length field */ packet = *ptr_packet; packet_len = packet->buffer[2];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ packet_len <<= 8; packet_len+= packet->buffer[3];/*lint !e415 !e416 creation and access of out-of-bounds pointer */ if((packet->len < packet_len) || (packet_len < 4)) { *forward=FORWARD_DISCARD; return; } /* * create a new larger packet and copy the content * of the old packet into the new */ packet_len+=4; if(packet_len > PPP_MRU_MIN) packet_len = PPP_MRU_MIN; MALLOC (temp_desc, (USHORT)(sizeof(T_desc2) - 1 + packet_len)); temp_desc->next = packet->next; temp_desc->len = packet_len; memcpy(&temp_desc->buffer[4], packet->buffer, packet_len - 4);/*lint !e416 !e669 !e670 creation of out-of-bounds pointer */ arb_discard_packet(packet); packet = temp_desc; /* * fill the first bytes to create a Code Reject */ packet->buffer[0] = CODE_CODE_REJ; ppp_data->ncp.nscji++; packet->buffer[1] = ppp_data->ncp.nscji;/*lint !e415 access of out-of-bounds pointer */ packet->buffer[2] = (UBYTE)(packet_len >> 8);/*lint !e415 !e416 creation and access of out-of-bounds pointer */ packet->buffer[3] = (UBYTE)(packet_len & 0x00ff);/*lint !e415 !e416 creation and access of out-of-bounds pointer */ /* * set return values */ *ptr_packet=packet; *forward=FORWARD_RUC; } /* ncp_ruc() */