/* $OpenBSD: tar.c,v 1.4 1996/08/27 03:53:14 tholo Exp $ */ /* $NetBSD: tar.c,v 1.5 1995/03/21 09:07:49 cgd Exp $ */ /*- * Copyright (c) 1992 Keith Muller. * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Keith Muller of the University of California, San Diego. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint #if 0 static char sccsid[] = "@(#)tar.c 8.2 (Berkeley) 4/18/94"; #else static char rcsid[] = "$OpenBSD: tar.c,v 1.4 1996/08/27 03:53:14 tholo Exp $"; #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include "pax.h" #include "extern.h" #include "tar.h" /* * Routines for reading, writing and header identify of various versions of tar */ static u_long tar_chksm __P((register char *, register int)); static char *name_split __P((register char *, register int)); static int ul_oct __P((u_long, register char *, register int, int)); #ifndef NET2_STAT static int uqd_oct __P((u_quad_t, register char *, register int, int)); #endif /* * Routines common to all versions of tar */ static int tar_nodir; /* do not write dirs under old tar */ /* * tar_endwr() * add the tar trailer of two null blocks * Return: * 0 if ok, -1 otherwise (what wr_skip returns) */ #if __STDC__ int tar_endwr(void) #else int tar_endwr() #endif { return(wr_skip((off_t)(NULLCNT*BLKMULT))); } /* * tar_endrd() * no cleanup needed here, just return size of trailer (for append) * Return: * size of trailer (2 * BLKMULT) */ #if __STDC__ off_t tar_endrd(void) #else off_t tar_endrd() #endif { return((off_t)(NULLCNT*BLKMULT)); } /* * tar_trail() * Called to determine if a header block is a valid trailer. We are passed * the block, the in_sync flag (which tells us we are in resync mode; * looking for a valid header), and cnt (which starts at zero) which is * used to count the number of empty blocks we have seen so far. * Return: * 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block * could never contain a header. */ #if __STDC__ int tar_trail(register char *buf, register int in_resync, register int *cnt) #else int tar_trail(buf, in_resync, cnt) register char *buf; register int in_resync; register int *cnt; #endif { register int i; /* * look for all zero, trailer is two consecutive blocks of zero */ for (i = 0; i < BLKMULT; ++i) { if (buf[i] != '\0') break; } /* * if not all zero it is not a trailer, but MIGHT be a header. */ if (i != BLKMULT) return(-1); /* * When given a zero block, we must be careful! * If we are not in resync mode, check for the trailer. Have to watch * out that we do not mis-identify file data as the trailer, so we do * NOT try to id a trailer during resync mode. During resync mode we * might as well throw this block out since a valid header can NEVER be * a block of all 0 (we must have a valid file name). */ if (!in_resync && (++*cnt >= NULLCNT)) return(0); return(1); } /* * ul_oct() * convert an unsigned long to an octal string. many oddball field * termination characters are used by the various versions of tar in the * different fields. term selects which kind to use. str is BLANK padded * at the front to len. we are unable to use only one format as many old * tar readers are very cranky about this. * Return: * 0 if the number fit into the string, -1 otherwise */ #if __STDC__ static int ul_oct(u_long val, register char *str, register int len, int term) #else static int ul_oct(val, str, len, term) u_long val; register char *str; register int len; int term; #endif { register char *pt; /* * term selects the appropriate character(s) for the end of the string */ pt = str + len - 1; switch(term) { case 3: *pt-- = '\0'; break; case 2: *pt-- = ' '; *pt-- = '\0'; break; case 1: *pt-- = ' '; break; case 0: default: *pt-- = '\0'; *pt-- = ' '; break; } /* * convert and blank pad if there is space */ while (pt >= str) { *pt-- = '0' + (char)(val & 0x7); if ((val = val >> 3) == (u_long)0) break; } while (pt >= str) *pt-- = ' '; if (val != (u_long)0) return(-1); return(0); } #ifndef NET2_STAT /* * uqd_oct() * convert an u_quad_t to an octal string. one of many oddball field * termination characters are used by the various versions of tar in the * different fields. term selects which kind to use. str is BLANK padded * at the front to len. we are unable to use only one format as many old * tar readers are very cranky about this. * Return: * 0 if the number fit into the string, -1 otherwise */ #if __STDC__ static int uqd_oct(u_quad_t val, register char *str, register int len, int term) #else static int uqd_oct(val, str, len, term) u_quad_t val; register char *str; register int len; int term; #endif { register char *pt; /* * term selects the appropriate character(s) for the end of the string */ pt = str + len - 1; switch(term) { case 3: *pt-- = '\0'; break; case 2: *pt-- = ' '; *pt-- = '\0'; break; case 1: *pt-- = ' '; break; case 0: default: *pt-- = '\0'; *pt-- = ' '; break; } /* * convert and blank pad if there is space */ while (pt >= str) { *pt-- = '0' + (char)(val & 0x7); if ((val = val >> 3) == 0) break; } while (pt >= str) *pt-- = ' '; if (val != (u_quad_t)0) return(-1); return(0); } #endif /* * tar_chksm() * calculate the checksum for a tar block counting the checksum field as * all blanks (BLNKSUM is that value pre-calculated, the sume of 8 blanks). * NOTE: we use len to short circuit summing 0's on write since we ALWAYS * pad headers with 0. * Return: * unsigned long checksum */ #if __STDC__ static u_long tar_chksm(register char *blk, register int len) #else static u_long tar_chksm(blk, len) register char *blk; register int len; #endif { register char *stop; register char *pt; u_long chksm = BLNKSUM; /* inital value is checksum field sum */ /* * add the part of the block before the checksum field */ pt = blk; stop = blk + CHK_OFFSET; while (pt < stop) chksm += (u_long)(*pt++ & 0xff); /* * move past the checksum field and keep going, spec counts the * checksum field as the sum of 8 blanks (which is pre-computed as * BLNKSUM). * ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding * starts, no point in summing zero's) */ pt += CHK_LEN; stop = blk + len; while (pt < stop) chksm += (u_long)(*pt++ & 0xff); return(chksm); } /* * Routines for old BSD style tar (also made portable to sysV tar) */ /* * tar_id() * determine if a block given to us is a valid tar header (and not a USTAR * header). We have to be on the lookout for those pesky blocks of all * zero's. * Return: * 0 if a tar header, -1 otherwise */ #if __STDC__ int tar_id(register char *blk, int size) #else int tar_id(blk, size) register char *blk; int size; #endif { register HD_TAR *hd; register HD_USTAR *uhd; if (size < BLKMULT) return(-1); hd = (HD_TAR *)blk; uhd = (HD_USTAR *)blk; /* * check for block of zero's first, a simple and fast test, then make * sure this is not a ustar header by looking for the ustar magic * cookie. We should use TMAGLEN, but some USTAR archive programs are * wrong and create archives missing the \0. Last we check the * checksum. If this is ok we have to assume it is a valid header. */ if (hd->name[0] == '\0') return(-1); if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0) return(-1); if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT)) return(-1); return(0); } /* * tar_opt() * handle tar format specific -o options * Return: * 0 if ok -1 otherwise */ #if __STDC__ int tar_opt(void) #else int tar_opt() #endif { OPLIST *opt; while ((opt = opt_next()) != NULL) { if (strcmp(opt->name, TAR_OPTION) || strcmp(opt->value, TAR_NODIR)) { paxwarn(1, "Unknown tar format -o option/value pair %s=%s", opt->name, opt->value); paxwarn(1,"%s=%s is the only supported tar format option", TAR_OPTION, TAR_NODIR); return(-1); } /* * we only support one option, and only when writing */ if ((act != APPND) && (act != ARCHIVE)) { paxwarn(1, "%s=%s is only supported when writing.", opt->name, opt->value); return(-1); } tar_nodir = 1; } return(0); } /* * tar_rd() * extract the values out of block already determined to be a tar header. * store the values in the ARCHD parameter. * Return: * 0 */ #if __STDC__ int tar_rd(register ARCHD *arcn, register char *buf) #else int tar_rd(arcn, buf) register ARCHD *arcn; register char *buf; #endif { register HD_TAR *hd; register char *pt; /* * we only get proper sized buffers passed to us */ if (tar_id(buf, BLKMULT) < 0) return(-1); arcn->org_name = arcn->name; arcn->sb.st_nlink = 1; arcn->pat = NULL; /* * copy out the name and values in the stat buffer */ hd = (HD_TAR *)buf; arcn->nlen = l_strncpy(arcn->name, hd->name, sizeof(hd->name) - 1); arcn->name[arcn->nlen] = '\0'; arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode,sizeof(hd->mode),OCT) & 0xfff); arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT); arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT); arcn->sb.st_size = (size_t)asc_ul(hd->size, sizeof(hd->size), OCT); arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT); arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime; /* * have to look at the last character, it may be a '/' and that is used * to encode this as a directory */ pt = &(arcn->name[arcn->nlen - 1]); arcn->pad = 0; arcn->skip = 0; switch(hd->linkflag) { case SYMTYPE: /* * symbolic link, need to get the link name and set the type in * the st_mode so -v printing will look correct. */ arcn->type = PAX_SLK; arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname, sizeof(hd->linkname) - 1); arcn->ln_name[arcn->ln_nlen] = '\0'; arcn->sb.st_mode |= S_IFLNK; break; case LNKTYPE: /* * hard link, need to get the link name, set the type in the * st_mode and st_nlink so -v printing will look better. */ arcn->type = PAX_HLK; arcn->sb.st_nlink = 2; arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname, sizeof(hd->linkname) - 1); arcn->ln_name[arcn->ln_nlen] = '\0'; /* * no idea of what type this thing really points at, but * we set something for printing only. */ arcn->sb.st_mode |= S_IFREG; break; case AREGTYPE: case REGTYPE: default: /* * If we have a trailing / this is a directory and NOT a file. */ arcn->ln_name[0] = '\0'; arcn->ln_nlen = 0; if (*pt == '/') { /* * it is a directory, set the mode for -v printing */ arcn->type = PAX_DIR; arcn->sb.st_mode |= S_IFDIR; arcn->sb.st_nlink = 2; } else { /* * have a file that will be followed by data. Set the * skip value to the size field and caluculate the size * of the padding. */ arcn->type = PAX_REG; arcn->sb.st_mode |= S_IFREG; arcn->pad = TAR_PAD(arcn->sb.st_size); arcn->skip = arcn->sb.st_size; } break; } /* * strip off any trailing slash. */ if (*pt == '/') { *pt = '\0'; --arcn->nlen; } return(0); } /* * tar_wr() * write a tar header for the file specified in the ARCHD to the archive. * Have to check for file types that cannot be stored and file names that * are too long. Be careful of the term (last arg) to ul_oct, each field * of tar has it own spec for the termination character(s). * ASSUMED: space after header in header block is zero filled * Return: * 0 if file has data to be written after the header, 1 if file has NO * data to write after the header, -1 if archive write failed */ #if __STDC__ int tar_wr(register ARCHD *arcn) #else int tar_wr(arcn) register ARCHD *arcn; #endif { register HD_TAR *hd; int len; char hdblk[sizeof(HD_TAR)]; /* * check for those file system types which tar cannot store */ switch(arcn->type) { case PAX_DIR: /* * user asked that dirs not be written to the archive */ if (tar_nodir) return(1); break; case PAX_CHR: paxwarn(1, "Tar cannot archive a character device %s", arcn->org_name); return(1); case PAX_BLK: paxwarn(1, "Tar cannot archive a block device %s", arcn->org_name); return(1); case PAX_SCK: paxwarn(1, "Tar cannot archive a socket %s", arcn->org_name); return(1); case PAX_FIF: paxwarn(1, "Tar cannot archive a fifo %s", arcn->org_name); return(1); case PAX_SLK: case PAX_HLK: case PAX_HRG: if (arcn->ln_nlen > sizeof(hd->linkname)) { paxwarn(1,"Link name too long for tar %s", arcn->ln_name); return(1); } break; case PAX_REG: case PAX_CTG: default: break; } /* * check file name len, remember extra char for dirs (the / at the end) */ len = arcn->nlen; if (arcn->type == PAX_DIR) ++len; if (len > sizeof(hd->name)) { paxwarn(1, "File name too long for tar %s", arcn->name); return(1); } /* * copy the data out of the ARCHD into the tar header based on the type * of the file. Remember many tar readers want the unused fields to be * padded with zero. We set the linkflag field (type), the linkname * (or zero if not used),the size, and set the padding (if any) to be * added after the file data (0 for all other types, as they only have * a header) */ hd = (HD_TAR *)hdblk; zf_strncpy(hd->name, arcn->name, sizeof(hd->name) - 1); arcn->name[sizeof(hd->name) - 1] = '\0'; arcn->pad = 0; if (arcn->type == PAX_DIR) { /* * directories are the same as files, except have a filename * that ends with a /, we add the slash here. No data follows, * dirs, so no pad. */ hd->linkflag = AREGTYPE; memset(hd->linkname, 0, sizeof(hd->linkname)); hd->name[len-1] = '/'; if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1)) goto out; } else if (arcn->type == PAX_SLK) { /* * no data follows this file, so no pad */ hd->linkflag = SYMTYPE; zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1); hd->linkname[sizeof(hd->linkname) - 1] = '\0'; if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1)) goto out; } else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) { /* * no data follows this file, so no pad */ hd->linkflag = LNKTYPE; zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1); hd->linkname[sizeof(hd->linkname) - 1] = '\0'; if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1)) goto out; } else { /* * data follows this file, so set the pad */ hd->linkflag = AREGTYPE; memset(hd->linkname, 0, sizeof(hd->linkname)); # ifdef NET2_STAT if (ul_oct((u_long)arcn->sb.st_size, hd->size, sizeof(hd->size), 1)) { # else if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size, sizeof(hd->size), 1)) { # endif paxwarn(1,"File is too large for tar %s", arcn->org_name); return(1); } arcn->pad = TAR_PAD(arcn->sb.st_size); } /* * copy those fields that are independent of the type */ if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) || ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) || ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) || ul_oct((u_long)arcn->sb.st_mtime, hd->mtime, sizeof(hd->mtime), 1)) goto out; /* * calculate and add the checksum, then write the header. A return of * 0 tells the caller to now write the file data, 1 says no data needs * to be written */ if (ul_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum, sizeof(hd->chksum), 2)) goto out; if (wr_rdbuf(hdblk, sizeof(HD_TAR)) < 0) return(-1); if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0) return(-1); if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG)) return(0); return(1); out: /* * header field is out of range */ paxwarn(1, "Tar header field is too small for %s", arcn->org_name); return(1); } /* * Routines for POSIX ustar */ /* * ustar_strd() * initialization for ustar read * Return: * 0 if ok, -1 otherwise */ #if __STDC__ int ustar_strd(void) #else int ustar_strd() #endif { if ((usrtb_start() < 0) || (grptb_start() < 0)) return(-1); return(0); } /* * ustar_stwr() * initialization for ustar write * Return: * 0 if ok, -1 otherwise */ #if __STDC__ int ustar_stwr(void) #else int ustar_stwr() #endif { if ((uidtb_start() < 0) || (gidtb_start() < 0)) return(-1); return(0); } /* * ustar_id() * determine if a block given to us is a valid ustar header. We have to * be on the lookout for those pesky blocks of all zero's * Return: * 0 if a ustar header, -1 otherwise */ #if __STDC__ int ustar_id(char *blk, int size) #else int ustar_id(blk, size) char *blk; int size; #endif { register HD_USTAR *hd; if (size < BLKMULT) return(-1); hd = (HD_USTAR *)blk; /* * check for block of zero's first, a simple and fast test then check * ustar magic cookie. We should use TMAGLEN, but some USTAR archive * programs are fouled up and create archives missing the \0. Last we * check the checksum. If ok we have to assume it is a valid header. */ if (hd->name[0] == '\0') return(-1); if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0) return(-1); if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT)) return(-1); return(0); } /* * ustar_rd() * extract the values out of block already determined to be a ustar header. * store the values in the ARCHD parameter. * Return: * 0 */ #if __STDC__ int ustar_rd(register ARCHD *arcn, register char *buf) #else int ustar_rd(arcn, buf) register ARCHD *arcn; register char *buf; #endif { register HD_USTAR *hd; register char *dest; register int cnt = 0; dev_t devmajor; dev_t devminor; /* * we only get proper sized buffers */ if (ustar_id(buf, BLKMULT) < 0) return(-1); arcn->org_name = arcn->name; arcn->sb.st_nlink = 1; arcn->pat = NULL; hd = (HD_USTAR *)buf; /* * see if the filename is split into two parts. if, so joint the parts. * we copy the prefix first and add a / between the prefix and name. */ dest = arcn->name; if (*(hd->prefix) != '\0') { cnt = l_strncpy(arcn->name, hd->prefix, sizeof(hd->prefix) - 1); hd->prefix[sizeof(hd->prefix) - 1] = '\0'; dest = arcn->name + arcn->nlen; *dest++ = '/'; } arcn->nlen = l_strncpy(dest, hd->name, sizeof(hd->name) - 1); arcn->nlen += cnt; arcn->name[arcn->nlen] = '\0'; /* * follow the spec to the letter. we should only have mode bits, strip * off all other crud we may be passed. */ arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode, sizeof(hd->mode), OCT) & 0xfff); arcn->sb.st_size = (size_t)asc_ul(hd->size, sizeof(hd->size), OCT); arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT); arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime; /* * If we can find the ascii names for gname and uname in the password * and group files we will use the uid's and gid they bind. Otherwise * we use the uid and gid values stored in the header. (This is what * the posix spec wants). */ hd->gname[sizeof(hd->gname) - 1] = '\0'; if (gid_name(hd->gname, &(arcn->sb.st_gid)) < 0) arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT); hd->uname[sizeof(hd->uname) - 1] = '\0'; if (uid_name(hd->uname, &(arcn->sb.st_uid)) < 0) arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT); /* * set the defaults, these may be changed depending on the file type */ arcn->ln_name[0] = '\0'; arcn->ln_nlen = 0; arcn->pad = 0; arcn->skip = 0; arcn->sb.st_rdev = (dev_t)0; /* * set the mode and PAX type according to the typeflag in the header */ switch(hd->typeflag) { case FIFOTYPE: arcn->type = PAX_FIF; arcn->sb.st_mode |= S_IFIFO; break; case DIRTYPE: arcn->type = PAX_DIR; arcn->sb.st_mode |= S_IFDIR; arcn->sb.st_nlink = 2; /* * Some programs that create ustar archives append a '/' * to the pathname for directories. This clearly violates * ustar specs, but we will silently strip it off anyway. */ if (arcn->name[arcn->nlen - 1] == '/') arcn->name[--arcn->nlen] = '\0'; break; case BLKTYPE: case CHRTYPE: /* * this type requires the rdev field to be set. */ if (hd->typeflag == BLKTYPE) { arcn->type = PAX_BLK; arcn->sb.st_mode |= S_IFBLK; } else { arcn->type = PAX_CHR; arcn->sb.st_mode |= S_IFCHR; } devmajor = (dev_t)asc_ul(hd->devmajor,sizeof(hd->devmajor),OCT); devminor = (dev_t)asc_ul(hd->devminor,sizeof(hd->devminor),OCT); arcn->sb.st_rdev = TODEV(devmajor, devminor); break; case SYMTYPE: case LNKTYPE: if (hd->typeflag == SYMTYPE) { arcn->type = PAX_SLK; arcn->sb.st_mode |= S_IFLNK; } else { arcn->type = PAX_HLK; /* * so printing looks better */ arcn->sb.st_mode |= S_IFREG; arcn->sb.st_nlink = 2; } /* * copy the link name */ arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname, sizeof(hd->linkname) - 1); arcn->ln_name[arcn->ln_nlen] = '\0'; break; case CONTTYPE: case AREGTYPE: case REGTYPE: default: /* * these types have file data that follows. Set the skip and * pad fields. */ arcn->type = PAX_REG; arcn->pad = TAR_PAD(arcn->sb.st_size); arcn->skip = arcn->sb.st_size; arcn->sb.st_mode |= S_IFREG; break; } return(0); } /* * ustar_wr() * write a ustar header for the file specified in the ARCHD to the archive * Have to check for file types that cannot be stored and file names that * are too long. Be careful of the term (last arg) to ul_oct, we only use * '\0' for the termination character (this is different than picky tar) * ASSUMED: space after header in header block is zero filled * Return: * 0 if file has data to be written after the header, 1 if file has NO * data to write after the header, -1 if archive write failed */ #if __STDC__ int ustar_wr(register ARCHD *arcn) #else int ustar_wr(arcn) register ARCHD *arcn; #endif { register HD_USTAR *hd; register char *pt; char hdblk[sizeof(HD_USTAR)]; /* * check for those file system types ustar cannot store */ if (arcn->type == PAX_SCK) { paxwarn(1, "Ustar cannot archive a socket %s", arcn->org_name); return(1); } /* * check the length of the linkname */ if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) && (arcn->ln_nlen > sizeof(hd->linkname))){ paxwarn(1, "Link name too long for ustar %s", arcn->ln_name); return(1); } /* * split the path name into prefix and name fields (if needed). if * pt != arcn->name, the name has to be split */ if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) { paxwarn(1, "File name too long for ustar %s", arcn->name); return(1); } hd = (HD_USTAR *)hdblk; arcn->pad = 0L; /* * split the name, or zero out the prefix */ if (pt != arcn->name) { /* * name was split, pt points at the / where the split is to * occur, we remove the / and copy the first part to the prefix */ *pt = '\0'; zf_strncpy(hd->prefix, arcn->name, sizeof(hd->prefix) - 1); *pt++ = '/'; } else memset(hd->prefix, 0, sizeof(hd->prefix)); /* * copy the name part. this may be the whole path or the part after * the prefix */ zf_strncpy(hd->name, pt, sizeof(hd->name) - 1); hd->name[sizeof(hd->name) - 1] = '\0'; /* * set the fields in the header that are type dependent */ switch(arcn->type) { case PAX_DIR: hd->typeflag = DIRTYPE; memset(hd->linkname, 0, sizeof(hd->linkname)); memset(hd->devmajor, 0, sizeof(hd->devmajor)); memset(hd->devminor, 0, sizeof(hd->devminor)); if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3)) goto out; break; case PAX_CHR: case PAX_BLK: if (arcn->type == PAX_CHR) hd->typeflag = CHRTYPE; else hd->typeflag = BLKTYPE; memset(hd->linkname, 0, sizeof(hd->linkname)); if (ul_oct((u_long)MAJOR(arcn->sb.st_rdev), hd->devmajor, sizeof(hd->devmajor), 3) || ul_oct((u_long)MINOR(arcn->sb.st_rdev), hd->devminor, sizeof(hd->devminor), 3) || ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3)) goto out; break; case PAX_FIF: hd->typeflag = FIFOTYPE; memset(hd->linkname, 0, sizeof(hd->linkname)); memset(hd->devmajor, 0, sizeof(hd->devmajor)); memset(hd->devminor, 0, sizeof(hd->devminor)); if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3)) goto out; break; case PAX_SLK: case PAX_HLK: case PAX_HRG: if (arcn->type == PAX_SLK) hd->typeflag = SYMTYPE; else hd->typeflag = LNKTYPE; zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1); hd->linkname[sizeof(hd->linkname) - 1] = '\0'; memset(hd->devmajor, 0, sizeof(hd->devmajor)); memset(hd->devminor, 0, sizeof(hd->devminor)); if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3)) goto out; break; case PAX_REG: case PAX_CTG: default: /* * file data with this type, set the padding */ if (arcn->type == PAX_CTG) hd->typeflag = CONTTYPE; else hd->typeflag = REGTYPE; memset(hd->linkname, 0, sizeof(hd->linkname)); memset(hd->devmajor, 0, sizeof(hd->devmajor)); memset(hd->devminor, 0, sizeof(hd->devminor)); arcn->pad = TAR_PAD(arcn->sb.st_size); # ifdef NET2_STAT if (ul_oct((u_long)arcn->sb.st_size, hd->size, sizeof(hd->size), 3)) { # else if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size, sizeof(hd->size), 3)) { # endif paxwarn(1,"File is too long for ustar %s",arcn->org_name); return(1); } break; } zf_strncpy(hd->magic, TMAGIC, TMAGLEN); zf_strncpy(hd->version, TVERSION, TVERSLEN); /* * set the remaining fields. Some versions want all 16 bits of mode * we better humor them (they really do not meet spec though).... */ if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3) || ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3) || ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3) || ul_oct((u_long)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3)) goto out; zf_strncpy(hd->uname,name_uid(arcn->sb.st_uid, 0),sizeof(hd->uname)); zf_strncpy(hd->gname,name_gid(arcn->sb.st_gid, 0),sizeof(hd->gname)); /* * calculate and store the checksum write the header to the archive * return 0 tells the caller to now write the file data, 1 says no data * needs to be written */ if (ul_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum, sizeof(hd->chksum), 3)) goto out; if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0) return(-1); if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0) return(-1); if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG)) return(0); return(1); out: /* * header field is out of range */ paxwarn(1, "Ustar header field is too small for %s", arcn->org_name); return(1); } /* * name_split() * see if the name has to be split for storage in a ustar header. We try * to fit the entire name in the name field without splitting if we can. * The split point is always at a / * Return * character pointer to split point (always the / that is to be removed * if the split is not needed, the points is set to the start of the file * name (it would violate the spec to split there). A NULL is returned if * the file name is too long */ #if __STDC__ static char * name_split(register char *name, register int len) #else static char * name_split(name, len) register char *name; register int len; #endif { register char *start; /* * check to see if the file name is small enough to fit in the name * field. if so just return a pointer to the name. */ if (len <= TNMSZ) return(name); if (len > (TPFSZ + TNMSZ + 1)) return(NULL); /* * we start looking at the biggest sized piece that fits in the name * field. We walk foward looking for a slash to split at. The idea is * to find the biggest piece to fit in the name field (or the smallest * prefix we can find) (the -1 is correct the biggest piece would * include the slash between the two parts that gets thrown away) */ start = name + len - TNMSZ - 1; while ((*start != '\0') && (*start != '/')) ++start; /* * if we hit the end of the string, this name cannot be split, so we * cannot store this file. */ if (*start == '\0') return(NULL); len = start - name; /* * NOTE: /str where the length of str == TNMSZ can not be stored under * the p1003.1-1990 spec for ustar. We could force a prefix of / and * the file would then expand on extract to //str. The len == 0 below * makes this special case follow the spec to the letter. */ if ((len > TPFSZ) || (len == 0)) return(NULL); /* * ok have a split point, return it to the caller */ return(start); }