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FBBRoutines.c
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/*
Copyright 2001-2015 John Wiseman G8BPQ
This file is part of LinBPQ/BPQ32.
LinBPQ/BPQ32 is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
LinBPQ/BPQ32 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with LinBPQ/BPQ32. If not, see http://www.gnu.org/licenses
*/
// Mail and Chat Server for BPQ32 Packet Switch
//
// FBB Forwarding Routines
#include "BPQMail.h"
int MaxRXSize = 99999;
int MaxTXSize = 99999;
struct FBBRestartData ** RestartData = NULL;
int RestartCount = 0;
struct B2RestartData ** B2RestartRecs = NULL;
int B2RestartCount = 0;
extern char ProperBaseDir[];
VOID FBBputs(CIRCUIT * conn, char * buf)
{
// Sends to user and logs
int len = strlen(buf);
WriteLogLine(conn, '>', buf, len -1, LOG_BBS);
QueueMsg(conn, buf, len);
if (conn->BBSFlags & NEEDLF)
QueueMsg(conn, "\n", 1);
}
VOID ProcessFBBLine(CIRCUIT * conn, struct UserInfo * user, UCHAR* Buffer, int len)
{
struct FBBHeaderLine * FBBHeader; // The Headers from an FBB forward block
int i;
int Index = 0; // Message Type Index for Stats
char * ptr;
char * Context;
char seps[] = " \r";
int RestartPtr;
char * Respptr;
BOOL AllRejected = TRUE;
if (conn->Flags & GETTINGMESSAGE)
{
ProcessMsgLine(conn, user, Buffer, len);
if (conn->Flags & GETTINGMESSAGE)
// Still going
return;
SetupNextFBBMessage(conn);
return;
}
if (conn->Flags & GETTINGTITLE)
{
ProcessMsgTitle(conn, user, Buffer, len);
return;
}
// Should be FA FB F> FS FF FQ
if (Buffer[0] == ';') // winlink comment or BPQ Type Select
{
if (memcmp(Buffer, "; MSGTYPES", 7) == 0)
{
char * ptr;
conn->SendB = conn->SendP = conn->SendT = FALSE;
ptr = strchr(&Buffer[10], 'B');
if (ptr)
{
conn->SendB = TRUE;
conn->MaxBLen = atoi(++ptr);
if (conn->MaxBLen == 0) conn->MaxBLen = 99999999;
}
ptr = strchr(&Buffer[10], 'T');
if (ptr)
{
conn->SendT = TRUE;
conn->MaxTLen = atoi(++ptr);
if (conn->MaxTLen == 0) conn->MaxTLen = 99999999;
}
ptr = strchr(&Buffer[10], 'P');
if (ptr)
{
conn->SendP = TRUE;
conn->MaxPLen = atoi(++ptr);
if (conn->MaxPLen == 0) conn->MaxPLen = 99999999;
}
return;
}
// Other ; Line - Ignore
return;
}
if (Buffer[0] != 'F')
{
BBSputs(conn, "*** Protocol Error - Line should start with 'F'\r");
Flush(conn);
Sleep(500);
Disconnect(conn->BPQStream);
return;
}
switch (Buffer[1])
{
case 'F':
// Request Reverse
if (conn->FBBMsgsSent)
FlagSentMessages(conn, user);
if (!FBBDoForward(conn)) // Send proposal if anthing to forward
{
FBBputs(conn, "FQ\r");
// LinFBB needs a Disconnect Here
if (conn->BPQBBS)
return; // BPQ will close when it sees FQ. Close collisions aren't good!
if ((conn->SessType & Sess_PACTOR) == 0)
conn->CloseAfterFlush = 20; // 2 Secs
else
conn->CloseAfterFlush = 20; // PACTOR/WINMOR drivers support deferred disc so 5 secs should be enough
}
return;
case 'S':
// Proposal response
Respptr=&Buffer[2];
for (i=0; i < conn->FBBIndex; i++)
{
FBBHeader = &conn->FBBHeaders[i];
if (FBBHeader->MsgType == 'P')
Index = PMSG;
else if (FBBHeader->MsgType == 'B')
Index = BMSG;
else if (FBBHeader->MsgType == 'T')
Index = TMSG;
Respptr++;
if (*Respptr == 'E')
{
// Rejected
Logprintf(LOG_BBS, conn, '?', "Proposal %d Rejected by far end", i + 1);
}
if ((*Respptr == '-') || (*Respptr == 'N') || (*Respptr == 'R') || (*Respptr == 'E')) // Not wanted
{
user->Total.MsgsRejectedOut[Index]++;
// Zap the entry
if (conn->Paclink || conn->RMSExpress) // Not using Bit Masks
{
// Kill Messages sent to paclink/RMS Express unless BBS FWD bit set
if (check_fwd_bit(FBBHeader->FwdMsg->fbbs, user->BBSNumber) == 0)
FlagAsKilled(FBBHeader->FwdMsg);
}
clear_fwd_bit(FBBHeader->FwdMsg->fbbs, user->BBSNumber);
set_fwd_bit(FBBHeader->FwdMsg->forw, user->BBSNumber);
FBBHeader->FwdMsg->Locked = 0; // Unlock
if (memcmp(FBBHeader->FwdMsg->fbbs, zeros, NBMASK) == 0)
{
FBBHeader->FwdMsg->status = 'F'; // Mark as forwarded
FBBHeader->FwdMsg->datechanged=time(NULL);
}
memset(FBBHeader, 0, sizeof(struct FBBHeaderLine));
conn->UserPointer->ForwardingInfo->MsgCount--;
continue;
}
if ((*Respptr == '=') || (*Respptr == 'L')) // Defer
{
// Remove entry from forwarding block
FBBHeader->FwdMsg->Defered = 4; // Don't retry for the next few forward cycles
memset(FBBHeader, 0, sizeof(struct FBBHeaderLine));
continue;
}
conn->RestartFrom = 0; // Assume Restart from
if ((*Respptr == '!') || (*Respptr == 'A'))
{
// Restart
char Num[10];
char *numptr=&Num[0];
Respptr++;
while (isdigit(*Respptr))
{
*(numptr++) = *(Respptr++);
}
*numptr = 0;
conn->RestartFrom = atoi(Num);
*(--Respptr) = '+'; // So can drop through
}
if ((*Respptr == '+') || (*Respptr == 'Y') || (*Respptr == 'H')) // Need it
{
struct tm * tm;
time_t now;
char * MsgBytes;
conn->FBBMsgsSent = TRUE; // Messages to flag as complete when next command received
AllRejected = FALSE;
if (conn->BBSFlags & FBBCompressed)
{
if (conn->BBSFlags & FBBB2Mode)
SendCompressedB2(conn, FBBHeader);
else
SendCompressed(conn, FBBHeader->FwdMsg);
}
else
{
nodeprintf(conn, "%s\r\n", FBBHeader->FwdMsg->title);
MsgBytes = ReadMessageFile(FBBHeader->FwdMsg->number);
if (MsgBytes == 0)
{
MsgBytes = _strdup("Message file not found\r\n");
FBBHeader->FwdMsg->length = strlen(MsgBytes);
}
now = time(NULL);
tm = gmtime(&now);
nodeprintf(conn, "R:%02d%02d%02d/%02d%02dZ %d@%s.%s %s\r\n",
tm->tm_year-100, tm->tm_mon+1, tm->tm_mday, tm->tm_hour, tm->tm_min,
FBBHeader->FwdMsg->number, BBSName, HRoute, RlineVer);
if (memcmp(MsgBytes, "R:", 2) != 0) // No R line, so must be our message - put blank line after header
BBSputs(conn, "\r\n");
QueueMsg(conn, MsgBytes, FBBHeader->FwdMsg->length);
free(MsgBytes);
user->Total.MsgsSent[Index]++;
user->Total.BytesForwardedOut[Index] += FBBHeader->FwdMsg->length;
nodeprintf(conn, "%c\r\n", 26);
}
continue;
}
BBSputs(conn, "*** Protocol Error - Invalid Proposal Response'\r");
}
conn->FBBIndex = 0; // ready for next block;
conn->FBBChecksum = 0;
if (AllRejected && conn->RMSExpress)
{
// RMS Express doesn't send FF or proposal after rejecting all messages
FBBputs(conn, "FF\r");
}
return;
case 'Q':
if (conn->FBBMsgsSent)
FlagSentMessages(conn, user);
Disconnect(conn->BPQStream);
return;
case 'A': // Proposal
case 'B': // Proposal
if (conn->FBBMsgsSent)
FlagSentMessages(conn, user); // Mark previously sent messages
if (conn->DoReverse == FALSE) // Dont accept messages
return;
// Accumulate checksum
for (i=0; i< len; i++)
{
conn->FBBChecksum+=Buffer[i];
}
// Parse Header
// Find free line
for (i = 0; i < 5; i++)
{
FBBHeader = &conn->FBBHeaders[i];
if (FBBHeader->Format == 0)
break;
}
if (i == 5)
{
BBSputs(conn, "*** Protocol Error - Too Many Proposals\r");
Flush(conn);
conn->CloseAfterFlush = 20; // 2 Secs
}
//FA P GM8BPQ G8BPQ G8BPQ 2209_GM8BPQ 8
FBBHeader->Format = Buffer[1];
ptr = strtok_s(&Buffer[3], seps, &Context);
if (ptr == NULL) goto badparam;
if (strlen(ptr) != 1) goto badparam;
FBBHeader->MsgType = *ptr;
if (FBBHeader->MsgType == 'P')
Index = PMSG;
else if (FBBHeader->MsgType == 'B')
Index = BMSG;
else if (FBBHeader->MsgType == 'T')
Index = TMSG;
ptr = strtok_s(NULL, seps, &Context);
if (ptr == NULL) goto badparam;
strlop(ptr, '-'); // Remove any (illegal) ssid
if (strlen(ptr) > 6 ) goto badparam;
strcpy(FBBHeader->From, ptr);
ptr = strtok_s(NULL, seps, &Context);
if (ptr == NULL) goto badparam;
if (strlen(ptr) > 40 ) goto badparam;
strcpy(FBBHeader->ATBBS, ptr);
ptr = strtok_s(NULL, seps, &Context);
if (ptr == NULL) goto badparam;
if (strlen(ptr) > 6 ) goto badparam;
strlop(ptr, '-'); // Remove any (illegal) ssid
strcpy(FBBHeader->To, ptr);
ptr = strtok_s(NULL, seps, &Context);
if (ptr == NULL) goto badparam;
if (strlen(ptr) > 12 ) goto badparam;
strcpy(FBBHeader->BID, ptr);
ptr = strtok_s(NULL, seps, &Context);
if (ptr == NULL) goto badparam;
FBBHeader->Size = atoi(ptr);
goto ok;
badparam:
BBSputs(conn, "*** Protocol Error - Proposal format error\r");
Flush(conn);
conn->CloseAfterFlush = 20; // 2 Secs
return;
ok:
// Check Filters
if (CheckRejFilters(FBBHeader->From, FBBHeader->To, FBBHeader->ATBBS))
{
memset(FBBHeader, 0, sizeof(struct FBBHeaderLine)); // Clear header
conn->FBBReplyChars[conn->FBBReplyIndex++] = '-';
Logprintf(LOG_BBS, conn, '?', "Message Rejected by Filters");
user->Total.MsgsRejectedIn[Index]++;
}
// If P Message, dont immediately reject on a Duplicate BID. Check if we still have the message
// If we do, reject it. If not, accept it again. (do we need some loop protection ???)
else if (DoWeWantIt(conn, FBBHeader) == FALSE)
{
memset(FBBHeader, 0, sizeof(struct FBBHeaderLine)); // Clear header
conn->FBBReplyChars[conn->FBBReplyIndex++] = '-';
user->Total.MsgsRejectedIn[Index]++;
}
else if ((RestartPtr = LookupRestart(conn, FBBHeader)) > 0)
{
conn->FBBReplyIndex += sprintf(&conn->FBBReplyChars[conn->FBBReplyIndex], "!%d", RestartPtr);
}
else if (LookupTempBID(FBBHeader->BID))
{
memset(FBBHeader, 0, sizeof(struct FBBHeaderLine)); // Clear header
conn->FBBReplyChars[conn->FBBReplyIndex++] = '=';
}
else
{
// Save BID in temp list in case we are offered it again before completion
BIDRec * TempBID = AllocateTempBIDRecord();
strcpy(TempBID->BID, FBBHeader->BID);
TempBID->u.conn = conn;
conn->FBBReplyChars[conn->FBBReplyIndex++] = '+';
}
FBBHeader->B2Message = FALSE;
return;
case 'C': // B2 Proposal
if (conn->FBBMsgsSent)
FlagSentMessages(conn, user); // Mark previously sent messages
if (conn->DoReverse == FALSE) // Dont accept messages
return;
// Accumulate checksum
for (i=0; i< len; i++)
{
conn->FBBChecksum+=Buffer[i];
}
// Parse Header
// Find free line
for (i = 0; i < 5; i++)
{
FBBHeader = &conn->FBBHeaders[i];
if (FBBHeader->Format == 0)
break;
}
if (i == 5)
{
BBSputs(conn, "*** Protocol Error - Too Many Proposals\r");
Flush(conn);
conn->CloseAfterFlush = 20; // 2 Secs
}
// FC EM A3EDD4P00P55 377 281 0
/*
FC Proposal code. Requires B2 SID feature.
Type Message type ( 1 or 2 alphanumeric characters
CM WinLink 2000 Control message
EM Encapsulated Message
ID Unique Message Identifier (max length 12 characters)
U-Size Uncompressed size of message
C-size Compressed size of message
*/
FBBHeader->Format = Buffer[1];
ptr = strtok_s(&Buffer[3], seps, &Context);
if (ptr == NULL) goto badparam2;
if (strlen(ptr) != 2) goto badparam2;
FBBHeader->MsgType = 'P'; //ptr[0];
ptr = strtok_s(NULL, seps, &Context);
if (ptr == NULL) goto badparam2;
if (strlen(ptr) > 12 ) goto badparam;
strcpy(FBBHeader->BID, ptr);
ptr = strtok_s(NULL, seps, &Context);
if (ptr == NULL) goto badparam2;
FBBHeader->Size = atoi(ptr);
ptr = strtok_s(NULL, seps, &Context);
if (ptr == NULL) goto badparam2;
FBBHeader->CSize = atoi(ptr);
FBBHeader->B2Message = TRUE;
// If using BPQ Extensions (From To AT in proposal) Check Filters
Buffer[len - 1] = 0;
if (conn->BPQBBS)
{
char * From = strtok_s(NULL, seps, &Context);
char * ATBBS = strtok_s(NULL, seps, &Context);
char * To = strtok_s(NULL, seps, &Context);
if (From && To && ATBBS && CheckRejFilters(From, To, ATBBS))
{
memset(FBBHeader, 0, sizeof(struct FBBHeaderLine)); // Clear header
conn->FBBReplyChars[conn->FBBReplyIndex++] = '-';
user->Total.MsgsRejectedIn[Index]++;
Logprintf(LOG_BBS, conn, '?', "Message Rejected by Filters");
return;
}
}
goto ok2;
badparam2:
BBSputs(conn, "*** Protocol Error - Proposal format error\r");
Flush(conn);
conn->CloseAfterFlush = 20; // 2 Secs
return;
ok2:
if (LookupBID(FBBHeader->BID))
{
memset(FBBHeader, 0, sizeof(struct FBBHeaderLine)); // Clear header
conn->FBBReplyChars[conn->FBBReplyIndex++] = '-';
Logprintf(LOG_BBS, conn, '?', "Message Rejected by BID Check");
user->Total.MsgsRejectedIn[Index]++;
}
else if (FBBHeader->Size > MaxRXSize)
{
memset(FBBHeader, 0, sizeof(struct FBBHeaderLine)); // Clear header
conn->FBBReplyChars[conn->FBBReplyIndex++] = '-';
Logprintf(LOG_BBS, conn, '?', "Message Rejected by Size Limit");
user->Total.MsgsRejectedIn[Index]++;
}
else if ((RestartPtr = LookupRestart(conn, FBBHeader)) > 0)
{
conn->FBBReplyIndex += sprintf(&conn->FBBReplyChars[conn->FBBReplyIndex], "!%d", RestartPtr);
}
else if (LookupTempBID(FBBHeader->BID))
{
memset(FBBHeader, 0, sizeof(struct FBBHeaderLine)); // Clear header
conn->FBBReplyChars[conn->FBBReplyIndex++] = '=';
}
else
{
// Save BID in temp list in case we are offered it again before completion
BIDRec * TempBID = AllocateTempBIDRecord();
strcpy(TempBID->BID, FBBHeader->BID);
TempBID->u.conn = conn;
conn->FBBReplyChars[conn->FBBReplyIndex++] = 'Y';
}
return;
case '>':
// Optional Checksum
if (conn->DoReverse == FALSE) // Dont accept messages
{
Logprintf(LOG_BBS, conn, '?', "Reverse Forwarding not allowed");
Disconnect(conn->BPQStream);
return;
}
if (len > 3)
{
int sum;
sscanf(&Buffer[3], "%x", &sum);
conn->FBBChecksum+=sum;
if (conn->FBBChecksum)
{
BBSputs(conn, "*** Proposal Checksum Error\r");
Flush(conn);
conn->CloseAfterFlush = 20; // 2 Secs
return;
}
}
// Return "FS ", followed by +-= for each proposal
conn->FBBReplyChars[conn->FBBReplyIndex] = 0;
conn->FBBReplyIndex = 0;
nodeprintfEx(conn, "FS %s\r", conn->FBBReplyChars);
// if all rejected, send proposals or prompt, else set up for first message
FBBHeader = &conn->FBBHeaders[0];
if (FBBHeader->MsgType == 0)
{
conn->FBBIndex = 0; // ready for first block;
memset(&conn->FBBHeaders[0], 0, 5 * sizeof(struct FBBHeaderLine));
conn->FBBChecksum = 0;
if (!FBBDoForward(conn)) // Send proposal if anthing to forward
{
conn->InputMode = 0;
if (conn->DoReverse)
FBBputs(conn, "FF\r");
else
{
FBBputs(conn, "FQ\r");
conn->CloseAfterFlush = 20; // 2 Secs
}
}
}
else
{
if (conn->BBSFlags & FBBCompressed)
{
conn->InputMode = 'B';
}
CreateMessage(conn, FBBHeader->From, FBBHeader->To, FBBHeader->ATBBS, FBBHeader->MsgType, FBBHeader->BID, NULL);
}
return;
}
return;
}
VOID FlagSentMessages(CIRCUIT * conn, struct UserInfo * user)
{
struct FBBHeaderLine * FBBHeader; // The Headers from an FBB forward block
int i;
// Called if FBB command received after sending a block of messages . Flag as as sent.
conn->FBBMsgsSent = FALSE;
for (i=0; i < 5; i++)
{
FBBHeader = &conn->FBBHeaders[i];
if (FBBHeader && FBBHeader->MsgType) // Not a zapped entry
{
if ((conn->Paclink || conn->RMSExpress) &&
// ((conn->UserPointer->flags & F_NTSMPS) == 0) &&
(FBBHeader->FwdMsg->type == 'P'))
{
// Kill Messages sent to paclink/RMS Express unless BBS FWD bit set
if (check_fwd_bit(FBBHeader->FwdMsg->fbbs, user->BBSNumber) == 0)
{
FlagAsKilled(FBBHeader->FwdMsg);
continue;
}
}
clear_fwd_bit(FBBHeader->FwdMsg->fbbs, user->BBSNumber);
set_fwd_bit(FBBHeader->FwdMsg->forw, user->BBSNumber);
// Only mark as forwarded if sent to all BBSs that should have it
if (memcmp(FBBHeader->FwdMsg->fbbs, zeros, NBMASK) == 0)
{
FBBHeader->FwdMsg->status = 'F'; // Mark as forwarded
FBBHeader->FwdMsg->datechanged=time(NULL);
}
FBBHeader->FwdMsg->Locked = 0; // Unlock
conn->UserPointer->ForwardingInfo->MsgCount--;
}
}
memset(&conn->FBBHeaders[0], 0, 5 * sizeof(struct FBBHeaderLine));
}
VOID SetupNextFBBMessage(CIRCUIT * conn)
{
struct FBBHeaderLine * FBBHeader; // The Headers from an FBB forward block
memmove(&conn->FBBHeaders[0], &conn->FBBHeaders[1], 4 * sizeof(struct FBBHeaderLine));
memset(&conn->FBBHeaders[4], 0, sizeof(struct FBBHeaderLine));
FBBHeader = &conn->FBBHeaders[0];
if (FBBHeader->MsgType == 0)
{
conn->FBBIndex = 0; // ready for next block;
memset(&conn->FBBHeaders[0], 0, 5 * sizeof(struct FBBHeaderLine));
conn->FBBChecksum = 0;
conn->InputMode = 0;
if (!FBBDoForward(conn)) // Send proposal if anthing to forward
{
conn->InputMode = 0;
FBBputs(conn, "FF\r");
}
}
else
{
if (conn->BBSFlags & FBBCompressed)
conn->InputMode = 'B';
CreateMessage(conn, FBBHeader->From, FBBHeader->To, FBBHeader->ATBBS, FBBHeader->MsgType, FBBHeader->BID, NULL);
}
}
BOOL FBBDoForward(CIRCUIT * conn)
{
int i;
char proposal[100];
int proplen;
if (FindMessagestoForward(conn))
{
// Send Proposal Block
struct FBBHeaderLine * FBBHeader;
for (i=0; i < conn->FBBIndex; i++)
{
FBBHeader = &conn->FBBHeaders[i];
if (conn->BBSFlags & FBBB2Mode)
if (conn->BPQBBS)
// Add From and To Header for Filters
proplen = sprintf(proposal, "FC EM %s %d %d %s %s %s\r",
FBBHeader->BID,
FBBHeader->Size,
FBBHeader->CSize,
FBBHeader->From,
(FBBHeader->ATBBS[0]) ? FBBHeader->ATBBS : conn->UserPointer->Call,
FBBHeader->To);
else
// FC EM A3EDD4P00P55 377 281 0
proplen = sprintf(proposal, "FC EM %s %d %d %d\r",
FBBHeader->BID,
FBBHeader->Size,
FBBHeader->CSize, 0);
else
proplen = sprintf(proposal, "%s %c %s %s %s %s %d\r",
(conn->BBSFlags & FBBCompressed) ? "FA" : "FB",
FBBHeader->MsgType,
FBBHeader->From,
(FBBHeader->ATBBS[0]) ? FBBHeader->ATBBS : conn->UserPointer->Call,
FBBHeader->To,
FBBHeader->BID,
FBBHeader->Size);
// Accumulate checksum
while(proplen > 0)
{
conn->FBBChecksum+=proposal[--proplen];
}
FBBputs(conn, proposal);
}
conn->FBBChecksum = - conn->FBBChecksum;
nodeprintfEx(conn, "F> %02X\r", conn->FBBChecksum);
return TRUE;
}
return FALSE;
}
VOID UnpackFBBBinary(CIRCUIT * conn)
{
int MsgLen, i, offset, n;
UCHAR * ptr;
loop:
ptr = conn->InputBuffer;
if (conn->InputLen < 2)
return; // All formats need at least two bytes
switch (*ptr)
{
case 1: // Header
MsgLen = ptr[1] + 2;
if (conn->InputLen < MsgLen)
return; // Wait for more
if (strlen(&ptr[2]) > 60)
{
memcpy(conn->TempMsg->title, &ptr[2], 60);
conn->TempMsg->title[60] = 0;
Debugprintf("FBB Subject too long - truncated, %s", &ptr[2]);
}
else
strcpy(conn->TempMsg->title, &ptr[2]);
offset = atoi(ptr+3+strlen(&ptr[2]));
ptr += MsgLen;
memmove(conn->InputBuffer, ptr, conn->InputLen-MsgLen);
conn->InputLen -= MsgLen;
conn->FBBChecksum = 0;
if (offset)
{
struct FBBRestartData * RestartRec;
// Trying to restart - make sure we have restart data
for (i = 1; i <= RestartCount; i++)
{
RestartRec = RestartData[i];
if ((RestartRec->UserPointer == conn->UserPointer)
&& (strcmp(RestartRec->TempMsg->bid, conn->TempMsg->bid) == 0))
{
if (RestartRec->TempMsg->length <= offset)
{
conn->TempMsg->length = RestartRec->TempMsg->length;
conn->MailBuffer = RestartRec->MailBuffer;
conn->MailBufferSize = RestartRec->MailBufferSize;
// FBB Seems to insert 6 Byte message
// It looks like the original csum and length - perhaps a a consistancy check
// But Airmail Sends the Restart Data in the next packet, move the check code.
conn->NeedRestartHeader = TRUE;
goto GotRestart;
}
else
{
BBSputs(conn, "*** Trying to restart from invalid position.\r");
Flush(conn);
conn->CloseAfterFlush = 20; // 2 Secs
return;
}
// Remove Restart info
for (n = i; n < RestartCount; n++)
{
RestartData[n] = RestartData[n+1]; // move down all following entries
}
RestartCount--;
}
}
// No Restart Data
BBSputs(conn, "*** Trying to restart, but no restart data.\r");
Flush(conn);
conn->CloseAfterFlush = 20; // 2 Secs
return;
}
// Create initial buffer of 10K. Expand if needed later
if (conn->MailBufferSize == 0)
{
// Dont allocate if restarting
conn->MailBuffer=malloc(10000);
conn->MailBufferSize=10000;
}
GotRestart:
if (conn->MailBuffer == NULL)
{
BBSputs(conn, "*** Failed to create Message Buffer\r");
conn->CloseAfterFlush = 20; // 2 Secs
return;
}
goto loop;
case 2: // Data Block
if (ptr[1] == 0)
MsgLen = 256;
else
MsgLen = ptr[1];
if (conn->InputLen < (MsgLen + 2))
return; // Wait for more
// Waiting for Restart Header, see if it has arrived
if (conn->NeedRestartHeader)
{
conn->NeedRestartHeader = FALSE;
if (conn->InputLen > 8)
{
ptr = conn->InputBuffer+2;
conn->InputLen -=8;
for (i=0; i<6; i++)
{
conn->FBBChecksum+=ptr[0];
ptr++;
}
memmove(conn->InputBuffer, ptr, conn->InputLen);
}
else
BBSputs(conn, "*** Extra 8 bytes missing.\r");
goto loop;
}
// Process it
ptr+=2;
for (i=0; i< MsgLen; i++)
{
conn->FBBChecksum+=ptr[i];
}