files.c

#include "files.h"
#include "ssh.h"
#include "http.h"
#include "memcached.h"
#include "fingerprint.h"
#include "xattr.h"
#include "check-hash.h"
#include "include-exclude.h"
#include "find.h"
#include <string.h>
#include <fnmatch.h>

//this is a map of all directories/collections visited, (webpages in the case of http). It's used to
//prevent getting trapped in loops
ListNode *Visited=NULL;



static int FileType(const char *Path, int FTFlags, struct stat *Stat)
{

    if ((FTFlags & FLAG_NET))
    {
        if (strncasecmp(Path,"ssh:",4)==0) return(FT_SSH);
        if (strncasecmp(Path,"http:",5)==0) return(FT_HTTP);
        if (strncasecmp(Path,"https:",6)==0) return(FT_HTTP);
    }

    if ((! Stat) || (Stat->st_mode==0))
    {
        return(FT_FILE);
    }

    //if we are in devmode then just open the following things as files
    if (FTFlags & FLAG_DEVMODE)  return(FT_FILE);

    //otherwise treat them specially
    if (S_ISDIR(Stat->st_mode))  return(FT_DIR);
    if( S_ISCHR(Stat->st_mode))  return(FT_CHR);
    if (S_ISBLK(Stat->st_mode))  return(FT_BLK);
    if (S_ISFIFO(Stat->st_mode)) return(FT_FIFO);
    if (S_ISSOCK(Stat->st_mode)) return(FT_SOCK);
    if (S_ISLNK(Stat->st_mode))  return(FT_LNK);

    return(FT_FILE);
}




int StatFile(HashratCtx *Ctx, const char *Path, struct stat *Stat)
{
    int val;

    memset(Stat, 0, sizeof(struct stat));
    //Pass NULL for stat, because we are only checking for 'net' type paths
    val=FileType(Path, Flags, NULL);

    if ((val !=FT_FILE) && (val !=FT_DIR) && (val != FT_LNK))
    {
        return(val);
    }

    if (Ctx->Flags & CTX_DEREFERENCE) val=stat(Path,Stat);
    else val=lstat(Path,Stat);

    if (val==0) return(FileType(Path,Flags, Stat));
    return(val);
}



void GlobFiles(HashratCtx *Ctx, const char *Path, int FType, ListNode *Dirs)
{
    char *Tempstr=NULL;
    glob_t Glob;
    int i, flags=0;
    struct stat *Stat;

    ListClear(Dirs, Destroy);
    switch (FType)
    {
    case FT_SSH:
        SSHGlob(Ctx, Path, Dirs);
        return;
        break;

    case FT_HTTP:
        HTTPGlob(Ctx, Path, Dirs);
        return;
        break;
    }

    Tempstr=QuoteCharsInStr(Tempstr, Path, "[]*?");
    Tempstr=CatStr(Tempstr,"/*");
#ifdef GLOB_PERIOD
    if (Ctx->Flags & CTX_HIDDEN) flags |= GLOB_PERIOD;
#endif
    glob(Tempstr,flags,0,&Glob);
    for (i=0; i < Glob.gl_pathc; i++)
    {
        if (
            (strcmp(GetBasename(Glob.gl_pathv[i]),".") !=0) &&
            (strcmp(GetBasename(Glob.gl_pathv[i]),"..") !=0)
        )
        {
            if (Dirs)
            {
                Stat=(struct stat *) calloc(1,sizeof(struct stat));
                if (StatFile(Ctx,Glob.gl_pathv[i], Stat) != -1)
                {
                    ListAddNamedItem(Dirs, Glob.gl_pathv[i], Stat);
                }
                else
                {
                    fprintf(stderr,"ERROR: Cannot stat file %s\n",Glob.gl_pathv[i]);
                    free(Stat);
                }
            }
        }
    }

    Destroy(Tempstr);
    globfree(&Glob);
}






int HashratHashFile(HashratCtx *Ctx, HASH *Hash, int Type, const char *Path, struct stat *FStat)
{
    STREAM *S;
    char *Tempstr=NULL, *User=NULL, *Pass=NULL;
    const char *ptr;
    int result, val, RetVal=FALSE;
    off_t bytes_read=0, size=0, oval;

    if (FStat) size=FStat->st_size;
    switch (Type)
    {
    case FT_HTTP:
        User=CopyStr(User,GetVar(Ctx->Vars,"HTTPUser"));
        Pass=CopyStr(Pass,GetVar(Ctx->Vars,"HTTPPass"));
        S=HTTPGet(Path);
        ptr=STREAMGetValue(S, "HTTP:ResponseCode");
        if ((!ptr) || (*ptr !='2'))
        {
            STREAMClose(S);
            S=NULL;
        }
        break;

    case FT_SSH:
        S=SSHGet(Ctx, Path);
        break;

    default:
        if ((! StrValid(Path)) || (strcmp(Path,"-")==0)) S=STREAMFromFD(0);
        else
        {
            if (Ctx->Flags & CTX_DEREFERENCE) S=STREAMOpen(Path,"rf");
            else S=STREAMOpen(Path,"rf");
        }
        break;
    }

    if (S)
    {
        Tempstr=SetStrLen(Tempstr,BUFSIZ);

        oval=size;
        if ((oval==0) || ( oval > BUFSIZ)) val=BUFSIZ;
        else val=(int)oval;
        result=STREAMReadBytes(S,Tempstr,val);
        while (result > STREAM_CLOSED)
        {
            Tempstr[result]='\0';

            if (result > 0) Hash->Update(Hash,Tempstr, result);
            bytes_read+=result;

            if (size > 0)
            {
                if ((Type != FT_HTTP) && (bytes_read >= size)) break;
                oval=size - bytes_read;
                if (oval > BUFSIZ) val=BUFSIZ;
                else val=(int)oval;
            }
            result=STREAMReadBytes(S,Tempstr,val);
        }

        if (FStat && (FStat->st_size==0)) FStat->st_size=bytes_read;
        if (Type != FT_SSH) STREAMClose(S);
        RetVal=TRUE;
    }

    Destroy(Tempstr);
    Destroy(User);
    Destroy(Pass);

//for now we close any connection after a 'get'
//Ctx->NetCon=NULL;

    return(RetVal);
}



void HashratFinishHash(char **RetStr, HashratCtx *Ctx, HASH *Hash)
{
    int val;
    const char *ptr;

    HashFinish(Hash,Ctx->Encoding,RetStr);

    /*
    ptr=GetVar(Ctx->Vars,"Output:Length");
    if (StrValid(ptr))
    {
    	val=atoi(ptr);
    	if ((val > 0) && (StrLen(*RetStr) > val)) (*RetStr)[val]='\0';
    }
    */
}



int HashratHashSingleFile(HashratCtx *Ctx, const char *HashType, int FileType, const char *Path, struct stat *FStat, char **RetStr)
{
    HASH *Hash;
    struct stat XattrStat;
    const char *ptr;

    *RetStr=CopyStr(*RetStr,"");

#ifdef USE_XATTR
    if (Ctx->Flags & CTX_XATTR_CACHE)
    {
        XAttrGetHash(Ctx, "user", Ctx->HashType, Path, &XattrStat, RetStr);
        //only use the hash cached in the xattr address if it's younger than the mtime
        printf("cache %llu %llu %llu\n",XattrStat.st_mtime, FStat->st_mtime, XattrStat.st_mtime - FStat->st_mtime);
        if ( ((XattrStat.st_mtime - FStat->st_mtime) < 10) ) *RetStr=CopyStr(*RetStr,"");
    }


    if (! StrValid(*RetStr))
#endif
    {
        Hash=HashInit(HashType);
        if (Hash)
        {
            //If we're not doing HMAC then this doesn't do anything
            ptr=GetVar(Ctx->Vars,"EncryptionKey");
            if (ptr) HMACSetKey(Hash, ptr, StrLen(ptr));

            if (! HashratHashFile(Ctx,Hash,FileType,Path, FStat)) return(FALSE);

            HashratFinishHash(RetStr, Ctx, Hash);
        }
    }

    if (StrValid(*RetStr)) return(TRUE);
    return(FALSE);
}



//This is used to processs small pieces of data like device IDs
void ProcessData(char **RetStr, HashratCtx *Ctx, const char *Data, int DataLen)
{
    const char *ptr;
    HASH *Hash;

    if (! Ctx->Hash)
    {
        Hash=HashInit(Ctx->HashType);
        if (Hash)
        {
            ptr=GetVar(Ctx->Vars,"EncryptionKey");
            if (ptr) HMACSetKey(Hash, ptr, StrLen(ptr));

            ptr=GetVar(Ctx->Vars, "InputPrefix");
            if (StrValid(ptr)) Hash->Update(Hash,ptr, StrLen(ptr));
            Hash->Update(Hash,Data, DataLen);
            HashratFinishHash(RetStr, Ctx, Hash);
        }
    }
    else Ctx->Hash->Update(Ctx->Hash,Data, DataLen);
}


static int ConsiderItem(HashratCtx *Ctx, const char *Path, struct stat *FStat)
{
    int Type, result;
    ListNode *Items, *Node;

    Type=FileType(Path, Flags, FStat);
    result=IncludeExcludeCheck(Ctx, Path, FStat);
    if (result != CTX_INCLUDE) return(result);

    switch (Type)
    {
    case FT_HTTP:
        Type=HTTPStat(Ctx, Path, FStat);
        if ((Type==FT_DIR) && (Ctx->Flags & CTX_RECURSE)) return(CTX_HASH_AND_RECURSE);
        break;

    case FT_SSH:
        Items=ListCreate();
        Type=SSHGlob(Ctx, Path, Items);
        //if remote path is a directory, then return without bothering to update
        //any information about it from 'Items'
        if (Type==FT_DIR)
        {
            ListDestroy(Items, Destroy);
            return(CTX_RECURSE);
        }

        //if it's a file then update FStat with its information
        Node=ListGetNext(Items);
        if (Node) memcpy(FStat, Node->Item, sizeof(struct stat));
        ListDestroy(Items, Destroy);
        break;

    case FT_DIR:
        if (Ctx->Flags & CTX_RECURSE) return(CTX_RECURSE);
        break;
    }

    return(0);
}


int HashItem(HashratCtx *Ctx, const char *HashType, const char *Path, struct stat *FStat, char **HashStr)
{
    int Type=FT_FILE, val;
    char *Tempstr=NULL;


    Type=FileType(Path, Flags, FStat);
    switch (Type)
    {
    case FT_HTTP:
        return(HashratHashSingleFile(Ctx, HashType, Type, Path, FStat, HashStr));
        break;

    case FT_SSH:
        return(HashratHashSingleFile(Ctx, HashType, Type, Path, FStat, HashStr));
        break;

    case FT_DIR:
        if (Ctx->Flags & CTX_RECURSE) return(CTX_RECURSE);
        else ProcessData(HashStr, Ctx, (const char *) &FStat->st_ino, sizeof(ino_t));
        break;

    case FT_CHR:
        ProcessData(HashStr, Ctx, (const char *) &FStat->st_rdev, sizeof(dev_t));
        break;

    case FT_BLK:
        ProcessData(HashStr, Ctx, (const char *) &FStat->st_rdev, sizeof(dev_t));
        break;

    case FT_FIFO:
        ProcessData(HashStr, Ctx, (const char *) &FStat->st_ino, sizeof(ino_t));
        break;

    case FT_SOCK:
        ProcessData(HashStr, Ctx, (const char *) &FStat->st_ino, sizeof(ino_t));
        break;

    case FT_LNK:
        if (Ctx->Flags & CTX_DEREFERENCE)
        {
            if (! Ctx->Hash)
            {
                if (! HashratHashSingleFile(Ctx, HashType, Type, Path, FStat, HashStr)) return(FALSE);
            } else if (! HashratHashFile(Ctx, Ctx->Hash,Type,Path, FStat)) return(FALSE);
        }
        else
        {
            fprintf(stderr,"WARN: Not following symbolic link %s\n",Path);
            Tempstr=SetStrLen(Tempstr,PATH_MAX);
            val=readlink(Path, Tempstr,PATH_MAX);
            if (val > 0)
            {
                Tempstr[val]='\0';
                ProcessData(HashStr, Ctx, Tempstr, val);
            }
        }
        break;

    default:
        if (! Ctx->Hash)
        {
            if (! HashratHashSingleFile(Ctx, HashType, Type, Path, FStat, HashStr)) return(FALSE);
        } else if (! HashratHashFile(Ctx, Ctx->Hash,Type,Path, FStat)) return(FALSE);
        break;
    }

    Destroy(Tempstr);

    return(TRUE);
}



//HashratAction returns true on a significant event, which is either an item found in search
//or a check failing in hash-checking mode
int HashratAction(HashratCtx *Ctx, const char *Path, struct stat *Stat)
{
    char *HashStr=NULL;
    int Type, result=FALSE;
    TFingerprint *FP=NULL;

    switch (Ctx->Action)
    {
    case ACT_HASHDIR:
        Type=FileType(Path, Flags, Stat);
        //we return TRUE if hash succeeded
        if (HashratHashFile(Ctx, Ctx->Hash, Type, Path, Stat)) result=TRUE;
        break;

    case ACT_HASH:
        HashStartTime=GetTime(TIME_MILLISECS);
        if (HashItem(Ctx, Ctx->HashType, Path, Stat, &HashStr))
        {
            HashratOutputFileInfo(Ctx, Ctx->Out, Path, Stat, HashStr);
            HashratStoreHash(Ctx, Path, Stat, HashStr);
            result=TRUE;
        }
        break;

    case ACT_CHECK:
        if (S_ISREG(Stat->st_mode))
        {
            if (Stat->st_size > 0)
            {
                HashItem(Ctx, Ctx->HashType, Path, Stat, &HashStr);
                FP=CheckForMatch(Ctx, Path, Stat, HashStr);
                if (FP && HashratCheckFile(Ctx, Path, Stat, HashStr, FP)) MatchCount++;
                else
                {
                    HandleCheckFail(Path, "Changed or new");
                    //we return TRUE on FAILURE, as we are signaling a significant event
                    result=TRUE;
                }
            }
            else if (Flags & FLAG_VERBOSE) fprintf(stderr,"ZERO LENGTH FILE: %s\n",Path);
        }
        break;

    case ACT_CHECK_XATTR:
        if (S_ISREG(Stat->st_mode))
        {
            //result == TRUE by default (TRUE==Signficant event, here meaning 'check failed')
            //we set it here so we get the right result even if the stored hash fails to load
            result=TRUE;
            FP=XAttrLoadHash(Ctx, Path);
            if (FP)
            {
                HashItem(Ctx, FP->HashType, Path, Stat, &HashStr);
                if (HashratCheckFile(Ctx, Path, Stat, HashStr, FP)) result=FALSE;
            }
            else fprintf(stderr,"ERROR: No stored hash for '%s'\n",Path);
        }
        else fprintf(stderr,"ERROR: Not regular file '%s'. Not checking in xattr mode.\n",Path);
        break;


    case ACT_CHECK_MEMCACHED:
        if (S_ISREG(Stat->st_mode))
        {
            //result == TRUE by default (TRUE==Signficant event, here meaning 'check failed')
            result=TRUE;

            if (Stat->st_size > 0)
            {
                HashItem(Ctx, Ctx->HashType, Path, Stat, &HashStr);
                FP=(TFingerprint *) calloc(1,sizeof(TFingerprint));
                if (Flags & FLAG_NET) FP->Path=MCopyStr(FP->Path, Path);
                else FP->Path=MCopyStr(FP->Path,"hashrat://",LocalHost,Path,NULL);
                FP->Hash=MemcachedGet(FP->Hash, FP->Path);

                if (FP && HashratCheckFile(Ctx, Path, NULL, HashStr, FP)) result=FALSE;
                else fprintf(stderr,"ERROR: No stored hash for '%s'\n",Path);
            }
            else if (Flags & FLAG_VERBOSE) fprintf(stderr,"ZERO LENGTH FILE: %s\n",Path);
        }
        else fprintf(stderr,"ERROR: Not regular file '%s'. Not checking in memcached mode.\n",Path);
        break;

    case ACT_FINDMATCHES:
    case ACT_FINDMATCHES_MEMCACHED:
        if (S_ISREG(Stat->st_mode))
        {
            if (Stat->st_size > 0)
            {
                HashItem(Ctx, Ctx->HashType, Path, Stat, &HashStr);
                FP=CheckForMatch(Ctx, Path, Stat, HashStr);
                if (FP)
                {
                    if (StrValid(FP->Path) || StrValid(FP->Data)) printf("LOCATED: %s '%s %s' at %s\n",FP->Hash, FP->Path, FP->Data, Path);
                    else printf("LOCATED: %s at %s\n",FP->Hash, Path);
                    MatchCount++;
                    //here we return true if a match found
                    result=TRUE;
                }
                else DiffCount++;
            }
            else if (Flags & FLAG_VERBOSE) fprintf(stderr,"ZERO LENGTH FILE: %s\n",Path);
        }
        break;

    case ACT_FINDDUPLICATES:
        if (S_ISREG(Stat->st_mode))
        {
            if (Stat->st_size > 0)
            {
                if (HashItem(Ctx, Ctx->HashType, Path, Stat, &HashStr))
                {
                    FP=CheckForMatch(Ctx, Path, Stat, HashStr);
                    if (FP)
                    {
                        printf("DUPLICATE: %s of %s %s\n",Path,FP->Path,FP->Data);
                        MatchCount++;
                        //here we return true if a match found
                        result=TRUE;
                    }
                    else
                    {
                        FP=TFingerprintCreate(HashStr, Ctx->HashType, "", Path);
                        DiffCount++;
                        MatchAdd(FP, Path, 0);
                        //as we've added FP to an internal list we don't want it destroyed
                        FP=NULL;
                    }
                }
            }
            else if (Flags & FLAG_VERBOSE) fprintf(stderr,"ZERO LENGTH FILE: %s\n",Path);
        }
        break;
    }

    if (result==TRUE)
    {
        if (FP) RunHookScript(DiffHook, Path, FP->Path);
        else RunHookScript(DiffHook, Path, "");
    }

    if (FP) TFingerprintDestroy(FP);
    Destroy(HashStr);

    return(result);
}


//ProcessItem returns TRUE on a significant event, so any instance of TRUE
//from items checked makes return value here TRUE
static int ProcessDir(HashratCtx *Ctx, const char *Dir)
{
    char *Tempstr=NULL;
    ListNode *FileList, *Curr;
    int result=FALSE;
    int Type;

    Type=FileType(Dir, Flags, NULL);

    FileList=ListCreate();
    GlobFiles(Ctx, Dir, Type, FileList);

    Curr=ListGetNext(FileList);
    while (Curr)
    {
        if (ProcessItem(Ctx, Curr->Tag, (struct stat *) Curr->Item, FALSE)) result=TRUE;
        Curr=ListGetNext(Curr);
    }

    ListDestroy(FileList,free);

    Destroy(Tempstr);

    return(result);
}


//ProcessDir returns TRUE on a significant event, so any instance of TRUE
//from items checked makes return value here TRUE
static int HashratRecurse(HashratCtx *Ctx, const char *Path, char **HashStr)
{
    const char *ptr;
    struct stat FStat;
    int result=FALSE;

    if ((Ctx->Action == ACT_HASHDIR) && (! Ctx->Hash))
    {
        HashStartTime=GetTime(TIME_MILLISECS);
        Ctx->Hash=HashInit(Ctx->HashType);
        ptr=GetVar(Ctx->Vars,"EncryptionKey");
        if (ptr) HMACSetKey(Ctx->Hash, ptr, StrLen(ptr));

        if (! ProcessDir(Ctx, Path)) result=FALSE;
        HashratFinishHash(HashStr, Ctx, Ctx->Hash);
        stat(Path, &FStat);
        HashratOutputFileInfo(Ctx, Ctx->Out, Path, &FStat, *HashStr);
        result=TRUE;
    }
    else if (ProcessDir(Ctx, Path)) result=TRUE;

    return(result);
}




int ProcessItem(HashratCtx *Ctx, const char *Path, struct stat *Stat, int IsTopLevel)
{
    char *HashStr=NULL;
    int result=FALSE, Flags;
    const char *p_Path;

    p_Path=Path;
    if (strncmp(p_Path, "./", 2)==0) p_Path+=2;


    if (! Visited) Visited=MapCreate(1025, LIST_FLAG_CACHE);
    if (! ListFindNamedItem(Visited, p_Path))
    {
        ListAddNamedItem(Visited, p_Path, NULL);
        switch (ConsiderItem(Ctx, p_Path, Stat))
        {
        case CTX_EXCLUDE:
        case CTX_ONE_FS:
            result=IGNORE;
            break;

        case CTX_RECURSE:
            result=HashratRecurse(Ctx, p_Path, &HashStr);
            break;

        case CTX_HASH_AND_RECURSE:
            result=HashratAction(Ctx, p_Path, Stat);
            result=HashratRecurse(Ctx, p_Path, &HashStr);
            break;


        default:
            result=HashratAction(Ctx, p_Path, Stat);
            break;
        }
    }

    if (IsTopLevel)
    {
        ListClear(Visited, NULL);
    }
    Destroy(HashStr);

    return(result);
}