385 lines
8.2 KiB
C
385 lines
8.2 KiB
C
/*
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** Copyright 1998-2003 University of Illinois Board of Trustees
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** Copyright 1998-2003 Mark D. Roth
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** All rights reserved.
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**
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** block.c - libtar code to handle tar archive header blocks
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**
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** Mark D. Roth <roth@uiuc.edu>
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** Campus Information Technologies and Educational Services
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** University of Illinois at Urbana-Champaign
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*/
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#include <libtarint/internal.h>
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#include <errno.h>
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#ifdef STDC_HEADERS
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# include <string.h>
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# include <stdlib.h>
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#endif
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#define BIT_ISSET(bitmask, bit) ((bitmask) & (bit))
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/* read a header block */
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int
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th_read_internal(TAR *t)
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{
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ssize_t i;
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int num_zero_blocks = 0;
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#ifdef DEBUG
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printf("==> th_read_internal(TAR=\"%s\")\n", t->pathname);
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#endif
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while ((i = tar_block_read(t, &(t->th_buf))) == T_BLOCKSIZE)
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{
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/* two all-zero blocks mark EOF */
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if (t->th_buf.name[0] == '\0')
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{
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num_zero_blocks++;
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if (!BIT_ISSET(t->options, TAR_IGNORE_EOT)
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&& num_zero_blocks >= 2)
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return 0; /* EOF */
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else
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continue;
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}
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/* verify magic and version */
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if (BIT_ISSET(t->options, TAR_CHECK_MAGIC)
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&& strncmp(t->th_buf.magic, TMAGIC, TMAGLEN - 1) != 0)
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{
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#ifdef DEBUG
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puts("!!! unknown magic value in tar header");
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#endif
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return -2;
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}
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if (BIT_ISSET(t->options, TAR_CHECK_VERSION)
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&& strncmp(t->th_buf.version, TVERSION, TVERSLEN) != 0)
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{
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#ifdef DEBUG
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puts("!!! unknown version value in tar header");
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#endif
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return -2;
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}
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/* check chksum */
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if (!BIT_ISSET(t->options, TAR_IGNORE_CRC)
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&& !th_crc_ok(t))
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{
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#ifdef DEBUG
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puts("!!! tar header checksum error");
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#endif
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return -2;
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}
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break;
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}
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#ifdef DEBUG
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printf("<== th_read_internal(): returning %d\n", i);
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#endif
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return (int)i;
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}
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/* wrapper function for th_read_internal() to handle GNU extensions */
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int
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th_read(TAR *t)
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{
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ssize_t i, j;
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size_t sz;
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char *ptr;
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#ifdef DEBUG
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printf("==> th_read(t=0x%lx)\n", t);
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#endif
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if (t->th_buf.gnu_longname != NULL)
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free(t->th_buf.gnu_longname);
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if (t->th_buf.gnu_longlink != NULL)
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free(t->th_buf.gnu_longlink);
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memset(&(t->th_buf), 0, sizeof(struct tar_header));
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i = th_read_internal(t);
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if (i == 0)
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return 1;
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else if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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/* check for GNU long link extention */
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if (TH_ISLONGLINK(t))
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{
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sz = th_get_size(t);
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j = (sz / T_BLOCKSIZE) + (sz % T_BLOCKSIZE ? 1 : 0);
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#ifdef DEBUG
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printf(" th_read(): GNU long linkname detected "
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"(%ld bytes, %d blocks)\n", sz, j);
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#endif
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t->th_buf.gnu_longlink = (char *)malloc(j * T_BLOCKSIZE);
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if (t->th_buf.gnu_longlink == NULL)
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return -1;
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for (ptr = t->th_buf.gnu_longlink; j > 0;
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j--, ptr += T_BLOCKSIZE)
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{
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#ifdef DEBUG
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printf(" th_read(): reading long linkname "
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"(%d blocks left, ptr == %ld)\n", j, ptr);
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#endif
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i = tar_block_read(t, ptr);
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if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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#ifdef DEBUG
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printf(" th_read(): read block == \"%s\"\n", ptr);
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#endif
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}
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#ifdef DEBUG
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printf(" th_read(): t->th_buf.gnu_longlink == \"%s\"\n",
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t->th_buf.gnu_longlink);
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#endif
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i = th_read_internal(t);
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if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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}
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/* check for GNU long name extention */
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if (TH_ISLONGNAME(t))
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{
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sz = th_get_size(t);
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j = (sz / T_BLOCKSIZE) + (sz % T_BLOCKSIZE ? 1 : 0);
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#ifdef DEBUG
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printf(" th_read(): GNU long filename detected "
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"(%ld bytes, %d blocks)\n", sz, j);
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#endif
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t->th_buf.gnu_longname = (char *)malloc(j * T_BLOCKSIZE);
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if (t->th_buf.gnu_longname == NULL)
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return -1;
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for (ptr = t->th_buf.gnu_longname; j > 0;
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j--, ptr += T_BLOCKSIZE)
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{
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#ifdef DEBUG
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printf(" th_read(): reading long filename "
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"(%d blocks left, ptr == %ld)\n", j, ptr);
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#endif
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i = tar_block_read(t, ptr);
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if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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#ifdef DEBUG
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printf(" th_read(): read block == \"%s\"\n", ptr);
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#endif
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}
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#ifdef DEBUG
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printf(" th_read(): t->th_buf.gnu_longname == \"%s\"\n",
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t->th_buf.gnu_longname);
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#endif
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i = th_read_internal(t);
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if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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}
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#if 0
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/*
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** work-around for old archive files with broken typeflag fields
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** NOTE: I fixed this in the TH_IS*() macros instead
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*/
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/*
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** (directories are signified with a trailing '/')
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*/
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if (t->th_buf.typeflag == AREGTYPE
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&& t->th_buf.name[strlen(t->th_buf.name) - 1] == '/')
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t->th_buf.typeflag = DIRTYPE;
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/*
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** fallback to using mode bits
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*/
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if (t->th_buf.typeflag == AREGTYPE)
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{
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mode = (mode_t)oct_to_int(t->th_buf.mode);
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if (S_ISREG(mode))
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t->th_buf.typeflag = REGTYPE;
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else if (S_ISDIR(mode))
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t->th_buf.typeflag = DIRTYPE;
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else if (S_ISFIFO(mode))
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t->th_buf.typeflag = FIFOTYPE;
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else if (S_ISCHR(mode))
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t->th_buf.typeflag = CHRTYPE;
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else if (S_ISBLK(mode))
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t->th_buf.typeflag = BLKTYPE;
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else if (S_ISLNK(mode))
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t->th_buf.typeflag = SYMTYPE;
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}
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#endif
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return 0;
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}
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/* write a header block */
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int
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th_write(TAR *t)
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{
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ssize_t i, j;
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char type2;
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size_t sz, sz2;
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char *ptr;
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char buf[T_BLOCKSIZE];
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#ifdef DEBUG
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printf("==> th_write(TAR=\"%s\")\n", t->pathname);
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th_print(t);
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#endif
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if ((t->options & TAR_GNU) && t->th_buf.gnu_longlink != NULL)
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{
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#ifdef DEBUG
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printf("th_write(): using gnu_longlink (\"%s\")\n",
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t->th_buf.gnu_longlink);
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#endif
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/* save old size and type */
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type2 = t->th_buf.typeflag;
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sz2 = th_get_size(t);
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/* write out initial header block with fake size and type */
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t->th_buf.typeflag = GNU_LONGLINK_TYPE;
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sz = strlen(t->th_buf.gnu_longlink);
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th_set_size(t, sz);
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th_finish(t);
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i = tar_block_write(t, &(t->th_buf));
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if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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/* write out extra blocks containing long name */
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for (j = (sz / T_BLOCKSIZE) + (sz % T_BLOCKSIZE ? 1 : 0),
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ptr = t->th_buf.gnu_longlink; j > 1;
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j--, ptr += T_BLOCKSIZE)
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{
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i = tar_block_write(t, ptr);
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if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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}
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memset(buf, 0, T_BLOCKSIZE);
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strncpy(buf, ptr, T_BLOCKSIZE);
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i = tar_block_write(t, &buf);
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if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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/* reset type and size to original values */
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t->th_buf.typeflag = type2;
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th_set_size(t, sz2);
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}
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if ((t->options & TAR_GNU) && t->th_buf.gnu_longname != NULL)
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{
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#ifdef DEBUG
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printf("th_write(): using gnu_longname (\"%s\")\n",
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t->th_buf.gnu_longname);
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#endif
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/* save old size and type */
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type2 = t->th_buf.typeflag;
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sz2 = th_get_size(t);
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/* write out initial header block with fake size and type */
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t->th_buf.typeflag = GNU_LONGNAME_TYPE;
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sz = strlen(t->th_buf.gnu_longname);
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th_set_size(t, sz);
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th_finish(t);
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i = tar_block_write(t, &(t->th_buf));
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if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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/* write out extra blocks containing long name */
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for (j = (sz / T_BLOCKSIZE) + (sz % T_BLOCKSIZE ? 1 : 0),
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ptr = t->th_buf.gnu_longname; j > 1;
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j--, ptr += T_BLOCKSIZE)
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{
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i = tar_block_write(t, ptr);
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if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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}
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memset(buf, 0, T_BLOCKSIZE);
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strncpy(buf, ptr, T_BLOCKSIZE);
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i = tar_block_write(t, &buf);
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if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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/* reset type and size to original values */
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t->th_buf.typeflag = type2;
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th_set_size(t, sz2);
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}
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th_finish(t);
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#ifdef DEBUG
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/* print tar header */
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th_print(t);
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#endif
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i = tar_block_write(t, &(t->th_buf));
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if (i != T_BLOCKSIZE)
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{
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if (i != -1)
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errno = EINVAL;
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return -1;
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}
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#ifdef DEBUG
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puts("th_write(): returning 0");
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#endif
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return 0;
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}
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