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mfreq-index.c
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/* ************************************************************************
*
* mfreq-index
*
* (c) 1994-2013 by Markus Reschke
*
* ************************************************************************ */
/*
* local constants
*/
#define MFREQ_INDEX_C
/* defaults for this program */
#define NAME "mfreq-index"
#define CFG_FILENAME "index.cfg"
/*
* include header files
*/
/* local header files */
#include "common.h" /* common stuff */
#include "variables.h" /* global variables */
#include "functions.h" /* external functions */
/* files */
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <dirent.h>
/*
* more local constants
*/
/* update configuration path */
#ifndef CFG_PATH
#define CFG_PATH DEFAULT_CFG_PATH
#endif
/* build configuration filepath */
#define CFG_FILEPATH CFG_PATH"/"CFG_FILENAME
/*
* local functions
*/
_Bool ReadConfig(char *Filepath);
/* ************************************************************************
* data sorting
* ************************************************************************ */
/*
* sort file data by name
* - algorithm: merge sort
* - lower case > upper case
*/
IndexData_Type *MergeSort(IndexData_Type *List, IndexData_Type **Last)
{
IndexData_Type *NewList = NULL; /* return value */
IndexData_Type *LeftSub; /* left sublist */
IndexData_Type *RightSub; /* right sublist */
IndexData_Type *Element = NULL; /* single element */
IndexData_Type *MergedList; /* merged list */
unsigned int LeftSize; /* number of elements in left sublist */
unsigned int RightSize; /* number of elements in right sublist */
unsigned int StepSize; /* number of elements to process */
unsigned int Merges; /* number of sublist merges */
_Bool Run = True;
/* sanity check */
if (List == NULL) return NewList;
/*
* master loop
*/
StepSize = 1; /* start with sublists with one element each */
/* a 1 element sublist is sorted by definition :-) */
NewList = List; /* initialize new list for first loop run */
while (Run)
{
/* prepare this run */
LeftSub = NewList; /* start with new list */
NewList = NULL; /* reset new list */
MergedList = NULL; /* reset merged list */
Merges = 0; /* reset counter */
/*
* process list using sublists with StepSize elements
*/
/* as long as we haven't reached the lists end */
while (LeftSub)
{
/*
* create virtual left and right sublists with StepSize elements
*/
RightSub = LeftSub; /* starting point */
LeftSize = 0; /* reset size */
/* as long as we don't reach the lists end move SubSize elements to the right */
while (RightSub && (LeftSize < StepSize))
{
LeftSize++; /* increase size of left sublist */
RightSub = RightSub ->Next; /* move to next element */
}
RightSize = StepSize; /* assume size of right sublist to be StepSize */
/* might be larger than real size */
/*
* merge both sub lists as long as elements are left
* also prevent overrun of right sublist
*/
while ((LeftSize > 0) || ((RightSize > 0) && RightSub))
{
/*
* select element to merge
*/
/* no elements left in left sublist */
if (LeftSize == 0)
{
/* so take next element of right sublist */
Element = RightSub; /* take element */
RightSize--; /* one element less in sublist */
RightSub = RightSub->Next; /* move to next element in sublist */
}
/* no elements left in right sublist */
/* or end of right sublist reached */
else if ((RightSize == 0) || (RightSub == NULL))
{
/* so take next element of left sublist */
Element = LeftSub; /* take element */
LeftSize--; /* one element less in sublist */
LeftSub = LeftSub->Next; /* move to next element in sublist */
}
/* otherwise we have to compare the next elements of both sublists */
else
{
if (LeftSub->Name && RightSub->Name) /* sanity check */
{
if (strcmp(LeftSub->Name, RightSub->Name) <= 0)
{
/* element of left sublist is smaller or equal */
/* take that one */
Element = LeftSub; /* take element */
LeftSize--; /* one element less in sublist */
LeftSub = LeftSub->Next; /* move to next element in sublist */
}
else
{
/* element of right sublist is smaller */
/* take that one */
Element = RightSub; /* take element */
RightSize--; /* one element less in sublist */
RightSub = RightSub->Next; /* move to next element in sublist */
}
}
}
/*
* merge selected element
* by moving it to the merged list
*/
if (MergedList) /* if merged list exists */
{
MergedList->Next = Element; /* link element */
}
else /* otherwise */
{
/* it's the first element for the merged list */
/* and the starting point for the next loop run */
NewList = Element; /* set first element of new list */
}
MergedList = Element; /* Element is the new end of merged list */
}
Merges++; /* another merge done */
LeftSub = RightSub; /* move to next sublist pair */
}
MergedList->Next = NULL; /* end merged list */
/*
* loop control/feedback
*/
/* if only one merge is done we sorted the complete list */
if (Merges <= 1) /* if job done */
{
Run = False; /* end master loop */
/* if requested update pointer to last element */
if (Last) *Last = MergedList;
}
else /* another run required */
{
StepSize = StepSize * 2; /* double stepsize of sublist for next run */
}
}
return NewList;
}
/* ************************************************************************
* file handling
* ************************************************************************ */
/*
* check if file exists and is a regular file
*
* returns:
* - 1 on success
* - 0 on error
*/
_Bool CheckFile(char *Filepath)
{
_Bool Flag = False; /* return value */
struct stat FileData;
/* sanity check */
if (Filepath == NULL) return Flag;
/* check file type */
if (lstat(Filepath, &FileData) == 0)
{
if (S_ISREG(FileData.st_mode)) /* regular file */
{
Flag = True;
}
else
{
Log(L_WARN, "No regular file (%s)!", Filepath);
}
}
else
{
Log(L_WARN, "Can't access file (%s)!", Filepath);
}
return Flag;
}
/*
* open logfile
*
* returns:
* - 1 on success
* - 0 on error
*/
_Bool OpenLogfile()
{
_Bool Flag = False; /* return value */
/* sanity check */
if (Env->LogFilepath == NULL) return Flag;
Env->Log = fopen(Env->LogFilepath, "a"); /* append mode */
if (Env->Log != NULL) /* success */
{
/*
* We try to lock the logfile to ensure that only one
* instance of this tool is running.
*/
Flag = LockFile(Env->Log, Env->LogFilepath); /* lock file */
if (Flag == False)
{
Log(L_WARN, "Couldn't lock logfile!");
Log(L_WARN, "Another instance of " NAME " might be running.");
}
}
else /* error */
{
Log(L_WARN, "Couldn't open logfile (%s)!", Env->LogFilepath);
}
Log(L_INFO, NAME" "VERSION" started."); /* log: start */
return Flag;
}
/*
* read magic file and add filepaths to fileindex
*
* returns:
* - 1 on success
* - 0 on error
*/
_Bool ReadMagicFile(char *Filename)
{
_Bool Flag = False; /* return value */
_Bool Run = True; /* control flag */
FILE *File; /* filestream */
size_t Length;
File = fopen(Filename, "r"); /* read mode */
if (File)
{
while (Run)
{
/* read line-wise */
if (fgets(TempBuffer, DEFAULT_BUFFER_SIZE, File) != NULL)
{
Length = strlen(TempBuffer);
if (Length == 0) /* sanity check */
{
Run = False; /* end loop */
}
else if (Length == (DEFAULT_BUFFER_SIZE - 1)) /* maximum size reached */
{
/* now check if line matches buffer size exacly or exceeds it */
/* exact matches should have a LF as last character in front of the trailing 0 */
if (TempBuffer[Length - 1] != 10) /* pre-last char is not LF */
{
Run = False; /* end loop */
Log(L_WARN, "Input overflow for magic file (%s)!", Filename);
}
}
if (Run) /* if still in business */
{
/* remove LF at end of line */
if (TempBuffer[Length - 1] == 10)
{
TempBuffer[Length - 1] = 0;
Length--;
}
/* check if filepath is a regular file */
if (CheckFile(TempBuffer))
{
/* add to file index */
Run = AddDataElement(Filename, TempBuffer, NULL);
if (Run) Env->Files++; /* increase file counter */
}
}
}
else /* EOF or error */
{
Run = False; /* end loop */
}
}
Flag = True; /* signal success */
fclose(File); /* close file */
}
else
{
Log(L_WARN, "Couldn't open magic file (%s)!", Filename);
}
return Flag;
}
/*
* get magic files from directory
*
* returns:
* - 1 on success
* - 0 on error
*/
_Bool ProcessMagicPath(char *Path)
{
_Bool Flag = False; /* return value */
_Bool Run = True; /* control flag */
DIR *Directory;
struct dirent *File;
struct stat FileData;
/* sanity check */
if (Path == NULL) return Flag;
Directory = opendir(Path); /* open directory */
if (Directory == NULL) /* error */
{
Log(L_WARN, "Can't access directory (%s)!", Path);
}
else /* success */
{
if (chdir(Path) != 0) /* change current directory to path */
{ /* to simplify lstat later */
Run = False;
}
/* get all directory entries and check each name */
while (Run)
{
File = readdir(Directory); /* get next file */
if (File) /* got it */
{
/* check file type */
if (lstat(File->d_name, &FileData) == 0)
{
if (S_ISREG(FileData.st_mode)) /* regular file */
{
/* let's read the magic file if it's not excluded */
if (! MatchExcludeList(File->d_name))
Flag = ReadMagicFile(File->d_name);
}
}
}
else /* error or no more entries */
{
Run = False; /* end loop */
}
}
chdir(Env->CWD); /* change current directory back */
closedir(Directory); /* close directory */
}
return Flag;
}
/*
* get files from directory
*
* returns:
* - 1 on success
* - 0 on error
*/
_Bool ProcessPath(char *Path, char *PW, int Depth, _Bool AutoMagic)
{
_Bool Flag = False; /* return value */
_Bool Run = True; /* control flag */
_Bool AliasFlag = False; /* flag for path aliases */
DIR *Directory;
struct dirent *File;
struct stat FileData;
char *LocalPath = NULL; /* absolute path */
char *SubPath = NULL; /* path of sub-directory */
char *Help, *LastDot;
size_t Length;
unsigned int AliasNumber = 0; /* alias counter */
off_t AliasOffset = -1; /* alias file offset */
/* sanity check */
if ((Path == NULL) || (Depth < 0)) return Flag;
/* build absolute path if necessary */
if (Path[0] != '/') /* relative path */
{
snprintf(TempBuffer, DEFAULT_BUFFER_SIZE - 1,
"%s/%s", Env->CWD, Path);
LocalPath = CopyString(TempBuffer);
Path = LocalPath;
}
Directory = opendir(Path); /* open directory */
if (Directory != NULL) /* dir opened */
{
if (chdir(Path) != 0) /* change current directory to path */
{ /* to simplify lstat later */
Run = False;
}
/*
* path aliasing
*/
if (Env->CfgSwitches & SW_PATH_ALIASES) /* if enabled */
{
/* get and set top number */
if (Env->LastAlias) AliasNumber = Env->LastAlias->Number;
AliasNumber++;
/* check for overflow */
if (AliasNumber <= 10000) /* limit to 10000 */
{
/* add alias to list */
if (AddAliasElement(AliasNumber, Path))
{
AliasOffset = Env->LastAlias->Offset;
AliasFlag = True; /* perform aliasing */
}
else
{
Run = False;
}
}
/* else: AliasFlag is still false */
}
/* intermediate check */
if (Run)
{
Flag = True; /* now true by default */
}
else
{
Log(L_WARN, "Processing error (%s)!", Path);
}
/*
* get all directory entries and process each one
*/
while (Run)
{
File = readdir(Directory); /* get next file */
if (File) /* got it */
{
/* copy file name (File isn't re-entrant) */
snprintf(TempBuffer2, DEFAULT_BUFFER_SIZE - 1, "%s", File->d_name);
/* check file type */
if (lstat(TempBuffer2, &FileData) == 0)
{
if (S_ISREG(FileData.st_mode)) /* regular file */
{
/* add file to index if not excluded */
if (! MatchExcludeList(TempBuffer2))
{
/* build filepath */
/* omit filename (automatic filepath) */
if (AliasFlag) /* path alias enabled */
{
/* create aliased path */
/* format: %<offset>%/ */
snprintf(TempBuffer, DEFAULT_BUFFER_SIZE - 1,
"%%%ld%%/", AliasOffset);
}
else /* path alias disabled */
{
/* create full path */
snprintf(TempBuffer, DEFAULT_BUFFER_SIZE - 1,
"%s/", Path);
}
Flag = AddDataElement(TempBuffer2, TempBuffer, PW);
if (Flag) Env->Files++; /* increase file counter */
if (AutoMagic) /* auto magic enabled */
{
/* find last "." in filename */
Help = TempBuffer2;
LastDot = NULL;
while (Help[0] != 0) /* scan string */
{
if (Help[0] == '.') LastDot = Help;
Help++; /* next char */
}
/* create magic */
if (LastDot) /* got extension */
{
/* add filename to path */
Length = strlen(TempBuffer);
Help = &TempBuffer[Length]; /* pointer to end of string */
snprintf(Help, DEFAULT_BUFFER_SIZE - 1 - Length,
"%s", TempBuffer2);
LastDot[0] = 0; /* create sub-string */
Flag = AddDataElement(TempBuffer2, TempBuffer, PW);
}
}
}
}
else if (S_ISDIR(FileData.st_mode)) /* directory */
{
/* enter recursion but skip "." and ".." */
if ((Depth > 0) &&
(strcmp(TempBuffer2, ".") != 0) &&
(strcmp(TempBuffer2, "..") != 0))
{
/* create sub path */
snprintf(TempBuffer, DEFAULT_BUFFER_SIZE - 1,
"%s/%s", Path, TempBuffer2);
SubPath = CopyString(TempBuffer);
Flag = ProcessPath(SubPath, PW, Depth - 1, AutoMagic);
if (SubPath) /* free path */
{
free(SubPath);
SubPath = NULL;
}
chdir(Path); /* chdir back to current directory */
}
}
}
}
else /* error or no more entries */
{
Run = False; /* end loop */
}
}
chdir(Env->CWD); /* change current directory back */
closedir(Directory); /* close directory */
}
else /* error */
{
Log(L_WARN, "Can't access directory (%s)!", Path);
}
/* clean up */
if (LocalPath) free(LocalPath);
return Flag;
}
/* ************************************************************************
* commands
* ************************************************************************ */
/*
* include file
* Syntax: Include [Config <filepath>]
*
* returns:
* - 1 on success
* - 0 on error
*/
_Bool Cmd_Include(Token_Type *TokenList)
{
_Bool Flag = False; /* return value */
_Bool Run = True; /* control flag */
_Bool Error = False; /* error flag */
unsigned short Keyword = 0; /* keyword ID */
static char *Keywords[3] =
{"Include", "Config", NULL};
/* sanity check */
if (TokenList == NULL) return Flag;
/*
* parse tokens
*/
while (Run && TokenList && TokenList->String)
{
if (Keyword > 0) /* get value */
{
switch (Keyword)
{
case 2: /* config */
if (Env->ConfigDepth >= 2) /* limit cfg depth */
{
Log(L_WARN, "Cfg file depth exceeded!");
Run = False; /* end loop */
}
else /* include cfg file */
{
Run = ReadConfig(TokenList->String);
if (Run == False) Error = True; /* signal error */
}
}
Keyword = 0; /* reset */
}
else /* get keyword */
{
Keyword = GetKeyword(Keywords, TokenList->String);
switch (Keyword) /* keywords without data */
{
case 0: /* unknown keyword */
Run = False;
break;
case 1: /* command itself */
Keyword = 0; /* reset keyword */
}
}
TokenList = TokenList->Next; /* goto to next token */
}
/*
* check parser results
*/
if ((Run == False) || (Keyword > 0)) /* problem occured */
{
if (Error == False) /* syntax error */
{
LogCfgError();
}
}
else /* went fine */
{
Flag = True; /* signal success */
}
return Flag;
}
/*
* write file index
* Syntax: Index <filepath>
* (.data, .lookup, .alias and .offset will be appended)
*
* returns:
* - 1 on success
* - 0 on error
*/
_Bool Cmd_Index(Token_Type *TokenList)
{
_Bool Flag = False; /* return value */
_Bool Run = True; /* control flag */
unsigned short Get = 0; /* mode control */
Token_Type *FilepathToken = NULL; /* filepath token */
IndexData_Type *IndexData = NULL; /* data list */
IndexData_Type *LastData; /* last element in data list */
IndexLookup_Type *IndexLookup = NULL; /* lookup list */
IndexAlias_Type *IndexAlias = NULL; /* alias list */
FILE *DataFile = NULL; /* index data file */
FILE *LookupFile = NULL; /* index lookup file */
FILE *AliasFile = NULL; /* index alias file */
FILE *OffsetFile = NULL; /* index offset file */
_Bool DataLock = False; /* data file locked */
_Bool LookupLock = False; /* lookup file locked */
_Bool AliasLock = False; /* alias file locked */
_Bool OffsetLock = False; /* offset file locked */
char FirstChar = 0; /* first char of filename */
unsigned int Counter = 0; /* filename/line counter */
off_t Offset; /* file offset */
char *Help;
_Bool OffsetFlag = False; /* flag for binary search mode */
/* sanity check */
if (TokenList == NULL) return Flag;
/* update flag for binary search mode */
if (Env->CfgSwitches & SW_BINARY_SEARCH) OffsetFlag = True;
/*
* parse tokens
*/
while (Run && TokenList && TokenList->String)
{
if (Get == 1) /* get value: filepath */
{
FilepathToken = TokenList;
Get = 0; /* reset */
}
else if (strcasecmp(TokenList->String, "Index") == 0) /* filepath */
{
Get = 1;
}
else /* unknown */
{
Run = False;
}
TokenList = TokenList->Next; /* goto to next token */
}
/*
* check parser results
*/
if ((Run == False) || (Get > 0) || (FilepathToken == NULL))
{
Run = False;
LogCfgError();
}
/*
* sort data
*/
if (Run)
{
Run = False; /* reset flag */
IndexData = MergeSort(Env->DataList, &LastData); /* sort */
Env->DataList = IndexData; /* update list start */
Env->LastData = LastData; /* update list end */
if (IndexData != NULL) Run = True; /* ok for next part */
}
/*
* open index files
*/
if (Run)
{
Run = False; /* reset flag */
/* data file */
snprintf(TempBuffer, DEFAULT_BUFFER_SIZE - 1,
"%s."SUFFIX_DATA, FilepathToken->String);
DataFile = fopen(TempBuffer, "w"); /* truncate & write mode */
/* lookup file */
snprintf(TempBuffer, DEFAULT_BUFFER_SIZE - 1,
"%s."SUFFIX_LOOKUP, FilepathToken->String);
LookupFile = fopen(TempBuffer, "w"); /* truncate & write mode */
/* alias file */
snprintf(TempBuffer, DEFAULT_BUFFER_SIZE - 1,
"%s."SUFFIX_ALIAS, FilepathToken->String);
AliasFile = fopen(TempBuffer, "w"); /* truncate & write mode */
/* offset file */
snprintf(TempBuffer, DEFAULT_BUFFER_SIZE - 1,
"%s."SUFFIX_OFFSET, FilepathToken->String);
OffsetFile = fopen(TempBuffer, "w"); /* truncate & write mode */
/* check */
if (DataFile && LookupFile && AliasFile && OffsetFile)
{
Run = True; /* ok for next part */
}
else
{
Log(L_WARN, "Can't open index files (%s)!", FilepathToken->String);
}
}
/*
* lock index files
*/
if (Run)
{
Run = False; /* reset flag */
/* lock files */
DataLock = LockFile(DataFile, NULL);
LookupLock = LockFile(LookupFile, NULL);
AliasLock = LockFile(AliasFile, NULL);
OffsetLock = LockFile(OffsetFile, NULL);
/* check */
if (DataLock && LookupLock && AliasLock && OffsetLock)
{
Run = True; /* ok for next part */
}
else
{
Log(L_WARN, "Can't lock index files (%s)!", FilepathToken->String);
}
}
/*
* write data file and optional offset file
* also build lookup list
*
* format: <name>0x1F<filepath>[0x1F<password>]LF
* We use the ascii unit separator 31 (octal 037) as field separator.
* <filepath>: %<offset>%|<path>/<filename>
* %<offset>% for automatic path aliasing
* <filename> can be omitted if same as <name>
*/
if (Run)
{
while (IndexData) /* follow list */
{
Counter++; /* another file */
/* catch change of first letter */
if (IndexData->Name[0] != FirstChar)
{
/* update last line counter for old character */
IndexLookup = Env->LastLookup; /* get current pointer */
if (IndexLookup) IndexLookup->Stop = Counter - 1;
FirstChar = IndexData->Name[0]; /* save new character */
/* add lookup element for new character */
Offset = ftell(DataFile); /* get current offset of the data file */
AddLookupElement(FirstChar, Offset, Counter, 0);
}
/*
* write offset file
* format: <binary offset>
*/
if (OffsetFlag)
{
Offset = ftell(DataFile); /* get current offset of the data file */
/* write offset of the data file to the offset file */
if (fwrite(&Offset, sizeof(off_t), 1, OffsetFile) != 1)
{
Run = False; /* signal problem */
IndexData = NULL; /* end loop */
Log(L_WARN, "Write error for index offset file (%s)!", FilepathToken->String);
}
}
/* build data buffer */
if (IndexData->PW) /* password required */
{
snprintf(OutBuffer, DEFAULT_BUFFER_SIZE - 1,
"%s\037%s\037%s\n", IndexData->Name, IndexData->Filepath, IndexData->PW);
}
else /* no password */
{
snprintf(OutBuffer, DEFAULT_BUFFER_SIZE - 1,
"%s\037%s\n", IndexData->Name, IndexData->Filepath);
}
IndexData = IndexData->Next; /* go to next element */
/* and write to file */
if (fputs(OutBuffer, DataFile) < 0) /* got an error */
{
Run = False; /* signal problem */
IndexData = NULL; /* end loop */
Log(L_WARN, "Write error for index data file (%s)!", FilepathToken->String);
}
/* check for counter overflow */
if (Counter >= 1000000) /* keep it reasonable, not UINT_MAX */
{
Run = False; /* signal problem */
IndexData = NULL; /* end loop */
Log(L_WARN, "Fileindex overrun (%s)!", FilepathToken->String);
}
}
/* update stop line# of last char */
if (Run)
{
IndexLookup = Env->LastLookup; /* get current pointer */
if (IndexLookup) IndexLookup->Stop = Counter;
}
}
/*
* write lookup file
*
* format: <char> <file offset> <start line#> <stop line#>LF
*/
if (Run)