diff options
Diffstat (limited to 'tar.c')
| -rw-r--r-- | tar.c | 37 |
1 files changed, 34 insertions, 3 deletions
@@ -39,6 +39,7 @@ #include "internal.h" #define BB_DECLARE_EXTERN #define bb_need_io_error +#define bb_need_name_longer_then_foo #include "messages.c" #include <stdio.h> #include <dirent.h> @@ -57,12 +58,13 @@ #define MINOR(dev) ((dev)&0xff) #endif +#define NAME_SIZE 100 /* POSIX tar Header Block, from POSIX 1003.1-1990 */ struct TarHeader { /* byte offset */ - char name[100]; /* 0-99 */ + char name[NAME_SIZE]; /* 0-99 */ char mode[8]; /* 100-107 */ char uid[8]; /* 108-115 */ char gid[8]; /* 116-123 */ @@ -70,7 +72,7 @@ struct TarHeader char mtime[12]; /* 136-147 */ char chksum[8]; /* 148-155 */ char typeflag; /* 156-156 */ - char linkname[100]; /* 157-256 */ + char linkname[NAME_SIZE]; /* 157-256 */ char magic[6]; /* 257-262 */ char version[2]; /* 263-264 */ char uname[32]; /* 265-296 */ @@ -102,6 +104,8 @@ enum TarFileType DIRTYPE = '5', /* directory */ FIFOTYPE = '6', /* FIFO special */ CONTTYPE = '7', /* reserved */ + GNULONGLINK = 'K', /* GNU long (>100 chars) link name */ + GNULONGNAME = 'L', /* GNU long (>100 chars) file name */ }; typedef enum TarFileType TarFileType; @@ -496,6 +500,7 @@ static int readTarFile(const char* tarName, int extractFlag, int listFlag, { int status, tarFd=-1; int errorFlag=FALSE; + int skipNextHeaderFlag=FALSE; TarHeader rawHeader; TarInfo header; char** tmpList; @@ -517,7 +522,7 @@ static int readTarFile(const char* tarName, int extractFlag, int listFlag, /* Read the tar file, and iterate over it one file at a time */ while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) { - /* First, try to read the header */ + /* Try to read the header */ if ( readTarHeader(&rawHeader, &header) == FALSE ) { if ( *(header.name) == '\0' ) { goto endgame; @@ -531,6 +536,19 @@ static int readTarFile(const char* tarName, int extractFlag, int listFlag, goto endgame; header.tarFd = tarFd; + /* Skip funky extra GNU headers that precede long files */ + if ( (header.type == GNULONGNAME) || (header.type == GNULONGLINK) ) { + skipNextHeaderFlag=TRUE; + tarExtractRegularFile(&header, FALSE, FALSE); + continue; + } + if ( skipNextHeaderFlag == TRUE ) { + skipNextHeaderFlag=FALSE; + errorMsg(name_longer_then_foo, NAME_SIZE); + tarExtractRegularFile(&header, FALSE, FALSE); + continue; + } + #if defined BB_FEATURE_TAR_EXCLUDE { int skipFlag=FALSE; @@ -671,7 +689,15 @@ static int readTarFile(const char* tarName, int extractFlag, int listFlag, if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE) errorFlag=TRUE; break; +#if 0 + /* Handled earlier */ + case GNULONGNAME: + case GNULONGLINK: + skipNextHeaderFlag=TRUE; + break; +#endif default: + errorMsg("Unknown file type '%c' in tar file\n", header.type); close( tarFd); return( FALSE); } @@ -897,6 +923,11 @@ static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* return( TRUE); } + if (strlen(fileName) >= NAME_SIZE) { + errorMsg(name_longer_then_foo, NAME_SIZE); + return ( TRUE); + } + if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) { return( FALSE); } |