11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1992 Keith Muller. 31556Srgrimes * Copyright (c) 1992, 1993 41556Srgrimes * The Regents of the University of California. All rights reserved. 51556Srgrimes * 61556Srgrimes * This code is derived from software contributed to Berkeley by 71556Srgrimes * Keith Muller of the University of California, San Diego. 81556Srgrimes * 91556Srgrimes * Redistribution and use in source and binary forms, with or without 101556Srgrimes * modification, are permitted provided that the following conditions 111556Srgrimes * are met: 121556Srgrimes * 1. Redistributions of source code must retain the above copyright 131556Srgrimes * notice, this list of conditions and the following disclaimer. 141556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 151556Srgrimes * notice, this list of conditions and the following disclaimer in the 161556Srgrimes * documentation and/or other materials provided with the distribution. 171556Srgrimes * 4. Neither the name of the University nor the names of its contributors 181556Srgrimes * may be used to endorse or promote products derived from this software 191556Srgrimes * without specific prior written permission. 201556Srgrimes * 211556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311556Srgrimes * SUCH DAMAGE. 321556Srgrimes */ 331556Srgrimes 341556Srgrimes#ifndef lint 3536049Scharnier#if 0 3636049Scharnierstatic char sccsid[] = "@(#)file_subs.c 8.1 (Berkeley) 5/31/93"; 3736049Scharnier#endif 381556Srgrimes#endif /* not lint */ 3999110Sobrien#include <sys/cdefs.h> 4099110Sobrien__FBSDID("$FreeBSD$"); 411556Srgrimes 421556Srgrimes#include <sys/types.h> 431556Srgrimes#include <sys/time.h> 441556Srgrimes#include <sys/stat.h> 451556Srgrimes#include <unistd.h> 461556Srgrimes#include <fcntl.h> 471556Srgrimes#include <string.h> 481556Srgrimes#include <stdio.h> 491556Srgrimes#include <errno.h> 501556Srgrimes#include <sys/uio.h> 511556Srgrimes#include "pax.h" 5276351Skris#include "options.h" 531556Srgrimes#include "extern.h" 541556Srgrimes 551556Srgrimesstatic int 5690113Simpmk_link(char *,struct stat *,char *, int); 571556Srgrimes 581556Srgrimes/* 591556Srgrimes * routines that deal with file operations such as: creating, removing; 601556Srgrimes * and setting access modes, uid/gid and times of files 611556Srgrimes */ 621556Srgrimes 631556Srgrimes#define FILEBITS (S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 641556Srgrimes#define SETBITS (S_ISUID | S_ISGID) 651556Srgrimes#define ABITS (FILEBITS | SETBITS) 661556Srgrimes 671556Srgrimes/* 681556Srgrimes * file_creat() 691556Srgrimes * Create and open a file. 701556Srgrimes * Return: 711556Srgrimes * file descriptor or -1 for failure 721556Srgrimes */ 731556Srgrimes 741556Srgrimesint 7590113Simpfile_creat(ARCHD *arcn) 761556Srgrimes{ 771556Srgrimes int fd = -1; 781556Srgrimes mode_t file_mode; 791556Srgrimes int oerrno; 801556Srgrimes 811556Srgrimes /* 821556Srgrimes * assume file doesn't exist, so just try to create it, most times this 831556Srgrimes * works. We have to take special handling when the file does exist. To 841556Srgrimes * detect this, we use O_EXCL. For example when trying to create a 851556Srgrimes * file and a character device or fifo exists with the same name, we 86222177Suqs * can accidentally open the device by mistake (or block waiting to 87222177Suqs * open). If we find that the open has failed, then spend the effort 88222177Suqs * to figure out why. This strategy was found to have better average 891556Srgrimes * performance in common use than checking the file (and the path) 901556Srgrimes * first with lstat. 911556Srgrimes */ 921556Srgrimes file_mode = arcn->sb.st_mode & FILEBITS; 931556Srgrimes if ((fd = open(arcn->name, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 941556Srgrimes file_mode)) >= 0) 951556Srgrimes return(fd); 961556Srgrimes 971556Srgrimes /* 981556Srgrimes * the file seems to exist. First we try to get rid of it (found to be 991556Srgrimes * the second most common failure when traced). If this fails, only 1001556Srgrimes * then we go to the expense to check and create the path to the file 1011556Srgrimes */ 1021556Srgrimes if (unlnk_exist(arcn->name, arcn->type) != 0) 1031556Srgrimes return(-1); 1041556Srgrimes 1051556Srgrimes for (;;) { 1061556Srgrimes /* 1071556Srgrimes * try to open it again, if this fails, check all the nodes in 1081556Srgrimes * the path and give it a final try. if chk_path() finds that 1091556Srgrimes * it cannot fix anything, we will skip the last attempt 1101556Srgrimes */ 1111556Srgrimes if ((fd = open(arcn->name, O_WRONLY | O_CREAT | O_TRUNC, 1121556Srgrimes file_mode)) >= 0) 1131556Srgrimes break; 1141556Srgrimes oerrno = errno; 11576351Skris if (nodirs || chk_path(arcn->name,arcn->sb.st_uid,arcn->sb.st_gid) < 0) { 11676017Skris syswarn(1, oerrno, "Unable to create %s", arcn->name); 1171556Srgrimes return(-1); 1181556Srgrimes } 1191556Srgrimes } 1201556Srgrimes return(fd); 1211556Srgrimes} 1221556Srgrimes 1231556Srgrimes/* 1241556Srgrimes * file_close() 1251556Srgrimes * Close file descriptor to a file just created by pax. Sets modes, 1261556Srgrimes * ownership and times as required. 1271556Srgrimes * Return: 1281556Srgrimes * 0 for success, -1 for failure 1291556Srgrimes */ 1301556Srgrimes 1311556Srgrimesvoid 13290113Simpfile_close(ARCHD *arcn, int fd) 1331556Srgrimes{ 1341556Srgrimes int res = 0; 1351556Srgrimes 1361556Srgrimes if (fd < 0) 1371556Srgrimes return; 1381556Srgrimes if (close(fd) < 0) 13976017Skris syswarn(0, errno, "Unable to close file descriptor on %s", 1401556Srgrimes arcn->name); 1411556Srgrimes 1421556Srgrimes /* 1431556Srgrimes * set owner/groups first as this may strip off mode bits we want 1441556Srgrimes * then set file permission modes. Then set file access and 1458855Srgrimes * modification times. 1461556Srgrimes */ 1471556Srgrimes if (pids) 1481556Srgrimes res = set_ids(arcn->name, arcn->sb.st_uid, arcn->sb.st_gid); 1491556Srgrimes 1501556Srgrimes /* 1511556Srgrimes * IMPORTANT SECURITY NOTE: 1521556Srgrimes * if not preserving mode or we cannot set uid/gid, then PROHIBIT 1531556Srgrimes * set uid/gid bits 1541556Srgrimes */ 1551556Srgrimes if (!pmode || res) 1561556Srgrimes arcn->sb.st_mode &= ~(SETBITS); 1571556Srgrimes if (pmode) 1581556Srgrimes set_pmode(arcn->name, arcn->sb.st_mode); 1591556Srgrimes if (patime || pmtime) 1601556Srgrimes set_ftime(arcn->name, arcn->sb.st_mtime, arcn->sb.st_atime, 0); 1611556Srgrimes} 1621556Srgrimes 1631556Srgrimes/* 1641556Srgrimes * lnk_creat() 1651556Srgrimes * Create a hard link to arcn->ln_name from arcn->name. arcn->ln_name 1668855Srgrimes * must exist; 1671556Srgrimes * Return: 1681556Srgrimes * 0 if ok, -1 otherwise 1691556Srgrimes */ 1701556Srgrimes 1711556Srgrimesint 17290113Simplnk_creat(ARCHD *arcn) 1731556Srgrimes{ 1741556Srgrimes struct stat sb; 1751556Srgrimes 1761556Srgrimes /* 1771556Srgrimes * we may be running as root, so we have to be sure that link target 1781556Srgrimes * is not a directory, so we lstat and check 1791556Srgrimes */ 1801556Srgrimes if (lstat(arcn->ln_name, &sb) < 0) { 18176017Skris syswarn(1,errno,"Unable to link to %s from %s", arcn->ln_name, 1821556Srgrimes arcn->name); 1831556Srgrimes return(-1); 1841556Srgrimes } 1851556Srgrimes 1861556Srgrimes if (S_ISDIR(sb.st_mode)) { 18776017Skris paxwarn(1, "A hard link to the directory %s is not allowed", 1881556Srgrimes arcn->ln_name); 1891556Srgrimes return(-1); 1901556Srgrimes } 1911556Srgrimes 1921556Srgrimes return(mk_link(arcn->ln_name, &sb, arcn->name, 0)); 1931556Srgrimes} 1941556Srgrimes 1951556Srgrimes/* 1961556Srgrimes * cross_lnk() 1971556Srgrimes * Create a hard link to arcn->org_name from arcn->name. Only used in copy 19876017Skris * with the -l flag. No warning or error if this does not succeed (we will 1991556Srgrimes * then just create the file) 2001556Srgrimes * Return: 2011556Srgrimes * 1 if copy() should try to create this file node 2021556Srgrimes * 0 if cross_lnk() ok, -1 for fatal flaw (like linking to self). 2031556Srgrimes */ 2041556Srgrimes 2051556Srgrimesint 20690113Simpcross_lnk(ARCHD *arcn) 2071556Srgrimes{ 2081556Srgrimes /* 20946684Skris * try to make a link to original file (-l flag in copy mode). make sure 2101556Srgrimes * we do not try to link to directories in case we are running as root 2111556Srgrimes * (and it might succeed). 2121556Srgrimes */ 2131556Srgrimes if (arcn->type == PAX_DIR) 2141556Srgrimes return(1); 2151556Srgrimes return(mk_link(arcn->org_name, &(arcn->sb), arcn->name, 1)); 2161556Srgrimes} 2171556Srgrimes 2181556Srgrimes/* 2191556Srgrimes * chk_same() 2201556Srgrimes * In copy mode if we are not trying to make hard links between the src 2211556Srgrimes * and destinations, make sure we are not going to overwrite ourselves by 2221556Srgrimes * accident. This slows things down a little, but we have to protect all 2231556Srgrimes * those people who make typing errors. 2241556Srgrimes * Return: 2251556Srgrimes * 1 the target does not exist, go ahead and copy 2261556Srgrimes * 0 skip it file exists (-k) or may be the same as source file 2271556Srgrimes */ 2281556Srgrimes 2291556Srgrimesint 23090113Simpchk_same(ARCHD *arcn) 2311556Srgrimes{ 2321556Srgrimes struct stat sb; 2331556Srgrimes 2348855Srgrimes /* 2351556Srgrimes * if file does not exist, return. if file exists and -k, skip it 2361556Srgrimes * quietly 2371556Srgrimes */ 2381556Srgrimes if (lstat(arcn->name, &sb) < 0) 2391556Srgrimes return(1); 2401556Srgrimes if (kflag) 2411556Srgrimes return(0); 2421556Srgrimes 2431556Srgrimes /* 2441556Srgrimes * better make sure the user does not have src == dest by mistake 2451556Srgrimes */ 2461556Srgrimes if ((arcn->sb.st_dev == sb.st_dev) && (arcn->sb.st_ino == sb.st_ino)) { 24776017Skris paxwarn(1, "Unable to copy %s, file would overwrite itself", 2481556Srgrimes arcn->name); 2491556Srgrimes return(0); 2501556Srgrimes } 2511556Srgrimes return(1); 2521556Srgrimes} 2531556Srgrimes 2541556Srgrimes/* 2551556Srgrimes * mk_link() 2561556Srgrimes * try to make a hard link between two files. if ign set, we do not 2571556Srgrimes * complain. 2581556Srgrimes * Return: 2591556Srgrimes * 0 if successful (or we are done with this file but no error, such as 2601556Srgrimes * finding the from file exists and the user has set -k). 2611556Srgrimes * 1 when ign was set to indicates we could not make the link but we 2621556Srgrimes * should try to copy/extract the file as that might work (and is an 2631556Srgrimes * allowed option). -1 an error occurred. 2641556Srgrimes */ 2651556Srgrimes 2661556Srgrimesstatic int 26790113Simpmk_link(char *to, struct stat *to_sb, char *from, 2681556Srgrimes int ign) 2691556Srgrimes{ 2701556Srgrimes struct stat sb; 2711556Srgrimes int oerrno; 2721556Srgrimes 2731556Srgrimes /* 2741556Srgrimes * if from file exists, it has to be unlinked to make the link. If the 2751556Srgrimes * file exists and -k is set, skip it quietly 2761556Srgrimes */ 2771556Srgrimes if (lstat(from, &sb) == 0) { 2781556Srgrimes if (kflag) 2791556Srgrimes return(0); 2801556Srgrimes 2811556Srgrimes /* 2821556Srgrimes * make sure it is not the same file, protect the user 2831556Srgrimes */ 2841556Srgrimes if ((to_sb->st_dev==sb.st_dev)&&(to_sb->st_ino == sb.st_ino)) { 28576017Skris paxwarn(1, "Unable to link file %s to itself", to); 286169926Srse return(-1); 2871556Srgrimes } 2881556Srgrimes 2891556Srgrimes /* 2901556Srgrimes * try to get rid of the file, based on the type 2911556Srgrimes */ 2921556Srgrimes if (S_ISDIR(sb.st_mode)) { 2931556Srgrimes if (rmdir(from) < 0) { 29476017Skris syswarn(1, errno, "Unable to remove %s", from); 2951556Srgrimes return(-1); 2961556Srgrimes } 2971556Srgrimes } else if (unlink(from) < 0) { 2981556Srgrimes if (!ign) { 29976017Skris syswarn(1, errno, "Unable to remove %s", from); 3001556Srgrimes return(-1); 3011556Srgrimes } 3021556Srgrimes return(1); 3031556Srgrimes } 3041556Srgrimes } 3051556Srgrimes 3061556Srgrimes /* 3071556Srgrimes * from file is gone (or did not exist), try to make the hard link. 3081556Srgrimes * if it fails, check the path and try it again (if chk_path() says to 3091556Srgrimes * try again) 3101556Srgrimes */ 3111556Srgrimes for (;;) { 3121556Srgrimes if (link(to, from) == 0) 3131556Srgrimes break; 3141556Srgrimes oerrno = errno; 31576351Skris if (!nodirs && chk_path(from, to_sb->st_uid, to_sb->st_gid) == 0) 3161556Srgrimes continue; 3171556Srgrimes if (!ign) { 31876017Skris syswarn(1, oerrno, "Could not link to %s from %s", to, 3191556Srgrimes from); 3201556Srgrimes return(-1); 3211556Srgrimes } 3221556Srgrimes return(1); 3231556Srgrimes } 3241556Srgrimes 3251556Srgrimes /* 3261556Srgrimes * all right the link was made 3271556Srgrimes */ 3281556Srgrimes return(0); 3291556Srgrimes} 3301556Srgrimes 3311556Srgrimes/* 3321556Srgrimes * node_creat() 333102230Strhodes * create an entry in the file system (other than a file or hard link). 3341556Srgrimes * If successful, sets uid/gid modes and times as required. 3351556Srgrimes * Return: 3361556Srgrimes * 0 if ok, -1 otherwise 3371556Srgrimes */ 3381556Srgrimes 3391556Srgrimesint 34090113Simpnode_creat(ARCHD *arcn) 3411556Srgrimes{ 34290113Simp int res; 34390113Simp int ign = 0; 34490113Simp int oerrno; 34590113Simp int pass = 0; 3461556Srgrimes mode_t file_mode; 3471556Srgrimes struct stat sb; 3481556Srgrimes 3491556Srgrimes /* 3501556Srgrimes * create node based on type, if that fails try to unlink the node and 3511556Srgrimes * try again. finally check the path and try again. As noted in the 3521556Srgrimes * file and link creation routines, this method seems to exhibit the 3531556Srgrimes * best performance in general use workloads. 3541556Srgrimes */ 3551556Srgrimes file_mode = arcn->sb.st_mode & FILEBITS; 3561556Srgrimes 3571556Srgrimes for (;;) { 3581556Srgrimes switch(arcn->type) { 3591556Srgrimes case PAX_DIR: 3601556Srgrimes res = mkdir(arcn->name, file_mode); 3611556Srgrimes if (ign) 3621556Srgrimes res = 0; 3631556Srgrimes break; 3641556Srgrimes case PAX_CHR: 3651556Srgrimes file_mode |= S_IFCHR; 3661556Srgrimes res = mknod(arcn->name, file_mode, arcn->sb.st_rdev); 3671556Srgrimes break; 3681556Srgrimes case PAX_BLK: 3691556Srgrimes file_mode |= S_IFBLK; 3701556Srgrimes res = mknod(arcn->name, file_mode, arcn->sb.st_rdev); 3711556Srgrimes break; 3721556Srgrimes case PAX_FIF: 3731556Srgrimes res = mkfifo(arcn->name, file_mode); 3741556Srgrimes break; 3751556Srgrimes case PAX_SCK: 3761556Srgrimes /* 3771556Srgrimes * Skip sockets, operation has no meaning under BSD 3781556Srgrimes */ 37976017Skris paxwarn(0, 3801556Srgrimes "%s skipped. Sockets cannot be copied or extracted", 3811556Srgrimes arcn->name); 3821556Srgrimes return(-1); 3831556Srgrimes case PAX_SLK: 38476351Skris res = symlink(arcn->ln_name, arcn->name); 3851556Srgrimes break; 3861556Srgrimes case PAX_CTG: 3871556Srgrimes case PAX_HLK: 3881556Srgrimes case PAX_HRG: 3891556Srgrimes case PAX_REG: 3901556Srgrimes default: 3911556Srgrimes /* 3921556Srgrimes * we should never get here 3931556Srgrimes */ 39476017Skris paxwarn(0, "%s has an unknown file type, skipping", 3951556Srgrimes arcn->name); 3961556Srgrimes return(-1); 3971556Srgrimes } 3981556Srgrimes 3991556Srgrimes /* 4001556Srgrimes * if we were able to create the node break out of the loop, 4011556Srgrimes * otherwise try to unlink the node and try again. if that 4021556Srgrimes * fails check the full path and try a final time. 4031556Srgrimes */ 4041556Srgrimes if (res == 0) 4051556Srgrimes break; 4061556Srgrimes 4071556Srgrimes /* 4081556Srgrimes * we failed to make the node 4091556Srgrimes */ 4101556Srgrimes oerrno = errno; 4111556Srgrimes if ((ign = unlnk_exist(arcn->name, arcn->type)) < 0) 4121556Srgrimes return(-1); 4131556Srgrimes 4141556Srgrimes if (++pass <= 1) 4151556Srgrimes continue; 4161556Srgrimes 41776351Skris if (nodirs || chk_path(arcn->name,arcn->sb.st_uid,arcn->sb.st_gid) < 0) { 41876017Skris syswarn(1, oerrno, "Could not create: %s", arcn->name); 4191556Srgrimes return(-1); 4201556Srgrimes } 4211556Srgrimes } 4221556Srgrimes 4231556Srgrimes /* 4241556Srgrimes * we were able to create the node. set uid/gid, modes and times 4251556Srgrimes */ 4261556Srgrimes if (pids) 427187976Skientzle res = set_ids(arcn->name, arcn->sb.st_uid, arcn->sb.st_gid); 4281556Srgrimes else 4291556Srgrimes res = 0; 4301556Srgrimes 4311556Srgrimes /* 4321556Srgrimes * IMPORTANT SECURITY NOTE: 4331556Srgrimes * if not preserving mode or we cannot set uid/gid, then PROHIBIT any 4341556Srgrimes * set uid/gid bits 4351556Srgrimes */ 4361556Srgrimes if (!pmode || res) 4371556Srgrimes arcn->sb.st_mode &= ~(SETBITS); 4381556Srgrimes if (pmode) 4391556Srgrimes set_pmode(arcn->name, arcn->sb.st_mode); 4401556Srgrimes 44176351Skris if (arcn->type == PAX_DIR && strcmp(NM_CPIO, argv0) != 0) { 4421556Srgrimes /* 4431556Srgrimes * Dirs must be processed again at end of extract to set times 4441556Srgrimes * and modes to agree with those stored in the archive. However 4451556Srgrimes * to allow extract to continue, we may have to also set owner 4461556Srgrimes * rights. This allows nodes in the archive that are children 4471556Srgrimes * of this directory to be extracted without failure. Both time 4481556Srgrimes * and modes will be fixed after the entire archive is read and 4491556Srgrimes * before pax exits. 4501556Srgrimes */ 4511556Srgrimes if (access(arcn->name, R_OK | W_OK | X_OK) < 0) { 4521556Srgrimes if (lstat(arcn->name, &sb) < 0) { 45376017Skris syswarn(0, errno,"Could not access %s (stat)", 4541556Srgrimes arcn->name); 4551556Srgrimes set_pmode(arcn->name,file_mode | S_IRWXU); 4561556Srgrimes } else { 4571556Srgrimes /* 4581556Srgrimes * We have to add rights to the dir, so we make 4591556Srgrimes * sure to restore the mode. The mode must be 4601556Srgrimes * restored AS CREATED and not as stored if 4611556Srgrimes * pmode is not set. 4621556Srgrimes */ 4631556Srgrimes set_pmode(arcn->name, 4641556Srgrimes ((sb.st_mode & FILEBITS) | S_IRWXU)); 4651556Srgrimes if (!pmode) 4661556Srgrimes arcn->sb.st_mode = sb.st_mode; 4671556Srgrimes } 4681556Srgrimes 4691556Srgrimes /* 4701556Srgrimes * we have to force the mode to what was set here, 4711556Srgrimes * since we changed it from the default as created. 4721556Srgrimes */ 4731556Srgrimes add_dir(arcn->name, arcn->nlen, &(arcn->sb), 1); 4741556Srgrimes } else if (pmode || patime || pmtime) 4751556Srgrimes add_dir(arcn->name, arcn->nlen, &(arcn->sb), 0); 4761556Srgrimes } 4771556Srgrimes 4781556Srgrimes if (patime || pmtime) 4791556Srgrimes set_ftime(arcn->name, arcn->sb.st_mtime, arcn->sb.st_atime, 0); 4801556Srgrimes return(0); 4811556Srgrimes} 4821556Srgrimes 4831556Srgrimes/* 4841556Srgrimes * unlnk_exist() 485102230Strhodes * Remove node from file system with the specified name. We pass the type 4861556Srgrimes * of the node that is going to replace it. When we try to create a 4871556Srgrimes * directory and find that it already exists, we allow processing to 4881556Srgrimes * continue as proper modes etc will always be set for it later on. 4891556Srgrimes * Return: 4901556Srgrimes * 0 is ok to proceed, no file with the specified name exists 4911556Srgrimes * -1 we were unable to remove the node, or we should not remove it (-k) 4921556Srgrimes * 1 we found a directory and we were going to create a directory. 4931556Srgrimes */ 4941556Srgrimes 4951556Srgrimesint 49690113Simpunlnk_exist(char *name, int type) 4971556Srgrimes{ 4981556Srgrimes struct stat sb; 4991556Srgrimes 5001556Srgrimes /* 5011556Srgrimes * the file does not exist, or -k we are done 5021556Srgrimes */ 5031556Srgrimes if (lstat(name, &sb) < 0) 5041556Srgrimes return(0); 5051556Srgrimes if (kflag) 5061556Srgrimes return(-1); 5071556Srgrimes 5081556Srgrimes if (S_ISDIR(sb.st_mode)) { 5091556Srgrimes /* 5101556Srgrimes * try to remove a directory, if it fails and we were going to 5111556Srgrimes * create a directory anyway, tell the caller (return a 1) 5121556Srgrimes */ 5131556Srgrimes if (rmdir(name) < 0) { 5141556Srgrimes if (type == PAX_DIR) 5158855Srgrimes return(1); 51676017Skris syswarn(1,errno,"Unable to remove directory %s", name); 5171556Srgrimes return(-1); 5181556Srgrimes } 5191556Srgrimes return(0); 5201556Srgrimes } 5211556Srgrimes 5221556Srgrimes /* 5231556Srgrimes * try to get rid of all non-directory type nodes 5241556Srgrimes */ 5251556Srgrimes if (unlink(name) < 0) { 52676017Skris syswarn(1, errno, "Could not unlink %s", name); 5271556Srgrimes return(-1); 5281556Srgrimes } 5291556Srgrimes return(0); 5301556Srgrimes} 5311556Srgrimes 5321556Srgrimes/* 5331556Srgrimes * chk_path() 534102230Strhodes * We were trying to create some kind of node in the file system and it 5351556Srgrimes * failed. chk_path() makes sure the path up to the node exists and is 5361556Srgrimes * writeable. When we have to create a directory that is missing along the 5371556Srgrimes * path somewhere, the directory we create will be set to the same 5381556Srgrimes * uid/gid as the file has (when uid and gid are being preserved). 5391556Srgrimes * NOTE: this routine is a real performance loss. It is only used as a 540102230Strhodes * last resort when trying to create entries in the file system. 5411556Srgrimes * Return: 5421556Srgrimes * -1 when it could find nothing it is allowed to fix. 5431556Srgrimes * 0 otherwise 5441556Srgrimes */ 5451556Srgrimes 5461556Srgrimesint 54790113Simpchk_path( char *name, uid_t st_uid, gid_t st_gid) 5481556Srgrimes{ 54990113Simp char *spt = name; 5501556Srgrimes struct stat sb; 5511556Srgrimes int retval = -1; 5521556Srgrimes 5531556Srgrimes /* 5541556Srgrimes * watch out for paths with nodes stored directly in / (e.g. /bozo) 5551556Srgrimes */ 5561556Srgrimes if (*spt == '/') 5571556Srgrimes ++spt; 5581556Srgrimes 5591556Srgrimes for(;;) { 5601556Srgrimes /* 561222177Suqs * work forward from the first / and check each part of the path 5621556Srgrimes */ 5631556Srgrimes spt = strchr(spt, '/'); 5641556Srgrimes if (spt == NULL) 5651556Srgrimes break; 5661556Srgrimes *spt = '\0'; 5671556Srgrimes 5681556Srgrimes /* 5691556Srgrimes * if it exists we assume it is a directory, it is not within 5701556Srgrimes * the spec (at least it seems to read that way) to alter the 571102230Strhodes * file system for nodes NOT EXPLICITLY stored on the archive. 5721556Srgrimes * If that assumption is changed, you would test the node here 5731556Srgrimes * and figure out how to get rid of it (probably like some 5741556Srgrimes * recursive unlink()) or fix up the directory permissions if 5751556Srgrimes * required (do an access()). 5761556Srgrimes */ 5771556Srgrimes if (lstat(name, &sb) == 0) { 5781556Srgrimes *(spt++) = '/'; 5791556Srgrimes continue; 5801556Srgrimes } 5811556Srgrimes 5821556Srgrimes /* 5831556Srgrimes * the path fails at this point, see if we can create the 5841556Srgrimes * needed directory and continue on 5851556Srgrimes */ 5861556Srgrimes if (mkdir(name, S_IRWXU | S_IRWXG | S_IRWXO) < 0) { 5871556Srgrimes *spt = '/'; 5881556Srgrimes retval = -1; 5891556Srgrimes break; 5901556Srgrimes } 5911556Srgrimes 5921556Srgrimes /* 5931556Srgrimes * we were able to create the directory. We will tell the 5941556Srgrimes * caller that we found something to fix, and it is ok to try 5951556Srgrimes * and create the node again. 5961556Srgrimes */ 5971556Srgrimes retval = 0; 5981556Srgrimes if (pids) 5991556Srgrimes (void)set_ids(name, st_uid, st_gid); 6001556Srgrimes 6011556Srgrimes /* 602222177Suqs * make sure the user doesn't have some strange umask that 6031556Srgrimes * causes this newly created directory to be unusable. We fix 6041556Srgrimes * the modes and restore them back to the creation default at 6051556Srgrimes * the end of pax 6061556Srgrimes */ 6071556Srgrimes if ((access(name, R_OK | W_OK | X_OK) < 0) && 6081556Srgrimes (lstat(name, &sb) == 0)) { 6091556Srgrimes set_pmode(name, ((sb.st_mode & FILEBITS) | S_IRWXU)); 6101556Srgrimes add_dir(name, spt - name, &sb, 1); 6111556Srgrimes } 6121556Srgrimes *(spt++) = '/'; 6131556Srgrimes continue; 6141556Srgrimes } 6151556Srgrimes return(retval); 6161556Srgrimes} 6171556Srgrimes 6181556Srgrimes/* 6191556Srgrimes * set_ftime() 6201556Srgrimes * Set the access time and modification time for a named file. If frc is 62176017Skris * non-zero we force these times to be set even if the user did not 6221556Srgrimes * request access and/or modification time preservation (this is also 6231556Srgrimes * used by -t to reset access times). 6241556Srgrimes * When ign is zero, only those times the user has asked for are set, the 6251556Srgrimes * other ones are left alone. We do not assume the un-documented feature 626187976Skientzle * of many lutimes() implementations that consider a 0 time value as a do 6271556Srgrimes * not set request. 6281556Srgrimes */ 6291556Srgrimes 6301556Srgrimesvoid 6311556Srgrimesset_ftime(char *fnm, time_t mtime, time_t atime, int frc) 6321556Srgrimes{ 6331556Srgrimes static struct timeval tv[2] = {{0L, 0L}, {0L, 0L}}; 6341556Srgrimes struct stat sb; 6351556Srgrimes 63685616Sdillon tv[0].tv_sec = atime; 63785616Sdillon tv[1].tv_sec = mtime; 6381556Srgrimes if (!frc && (!patime || !pmtime)) { 6391556Srgrimes /* 6401556Srgrimes * if we are not forcing, only set those times the user wants 6411556Srgrimes * set. We get the current values of the times if we need them. 6421556Srgrimes */ 6431556Srgrimes if (lstat(fnm, &sb) == 0) { 6441556Srgrimes if (!patime) 64585616Sdillon tv[0].tv_sec = sb.st_atime; 6461556Srgrimes if (!pmtime) 64785616Sdillon tv[1].tv_sec = sb.st_mtime; 6481556Srgrimes } else 64976017Skris syswarn(0,errno,"Unable to obtain file stats %s", fnm); 6501556Srgrimes } 6511556Srgrimes 6521556Srgrimes /* 6531556Srgrimes * set the times 6541556Srgrimes */ 655187976Skientzle if (lutimes(fnm, tv) < 0) 65676017Skris syswarn(1, errno, "Access/modification time set failed on: %s", 6571556Srgrimes fnm); 6581556Srgrimes return; 6591556Srgrimes} 6601556Srgrimes 6611556Srgrimes/* 6621556Srgrimes * set_ids() 663102230Strhodes * set the uid and gid of a file system node 6641556Srgrimes * Return: 6651556Srgrimes * 0 when set, -1 on failure 6661556Srgrimes */ 6671556Srgrimes 6681556Srgrimesint 6691556Srgrimesset_ids(char *fnm, uid_t uid, gid_t gid) 6701556Srgrimes{ 67176351Skris if (lchown(fnm, uid, gid) < 0) { 67276351Skris /* 67376351Skris * ignore EPERM unless in verbose mode or being run by root. 67476351Skris * if running as pax, POSIX requires a warning. 67576351Skris */ 67676351Skris if (strcmp(NM_PAX, argv0) == 0 || errno != EPERM || vflag || 67776351Skris geteuid() == 0) 67876351Skris syswarn(1, errno, "Unable to set file uid/gid of %s", 67976351Skris fnm); 68076351Skris return(-1); 68176351Skris } 68276351Skris return(0); 68376351Skris} 68476351Skris 68576351Skris/* 6861556Srgrimes * set_pmode() 6871556Srgrimes * Set file access mode 6881556Srgrimes */ 6891556Srgrimes 6901556Srgrimesvoid 6911556Srgrimesset_pmode(char *fnm, mode_t mode) 6921556Srgrimes{ 6931556Srgrimes mode &= ABITS; 694187976Skientzle if (lchmod(fnm, mode) < 0) 69576017Skris syswarn(1, errno, "Could not set permissions on %s", fnm); 6961556Srgrimes return; 6971556Srgrimes} 6981556Srgrimes 6991556Srgrimes/* 7001556Srgrimes * file_write() 7011556Srgrimes * Write/copy a file (during copy or archive extract). This routine knows 7021556Srgrimes * how to copy files with lseek holes in it. (Which are read as file 7031556Srgrimes * blocks containing all 0's but do not have any file blocks associated 7041556Srgrimes * with the data). Typical examples of these are files created by dbm 7051556Srgrimes * variants (.pag files). While the file size of these files are huge, the 7061556Srgrimes * actual storage is quite small (the files are sparse). The problem is 7071556Srgrimes * the holes read as all zeros so are probably stored on the archive that 7081556Srgrimes * way (there is no way to determine if the file block is really a hole, 7091556Srgrimes * we only know that a file block of all zero's can be a hole). 7101556Srgrimes * At this writing, no major archive format knows how to archive files 7111556Srgrimes * with holes. However, on extraction (or during copy, -rw) we have to 7121556Srgrimes * deal with these files. Without detecting the holes, the files can 7131556Srgrimes * consume a lot of file space if just written to disk. This replacement 714102230Strhodes * for write when passed the basic allocation size of a file system block, 7151556Srgrimes * uses lseek whenever it detects the input data is all 0 within that 7161556Srgrimes * file block. In more detail, the strategy is as follows: 7171556Srgrimes * While the input is all zero keep doing an lseek. Keep track of when we 718222177Suqs * pass over file block boundaries. Only write when we hit a non zero 7191556Srgrimes * input. once we have written a file block, we continue to write it to 7201556Srgrimes * the end (we stop looking at the input). When we reach the start of the 7211556Srgrimes * next file block, start checking for zero blocks again. Working on file 722222177Suqs * block boundaries significantly reduces the overhead when copying files 7231556Srgrimes * that are NOT very sparse. This overhead (when compared to a write) is 7241556Srgrimes * almost below the measurement resolution on many systems. Without it, 7251556Srgrimes * files with holes cannot be safely copied. It does has a side effect as 7261556Srgrimes * it can put holes into files that did not have them before, but that is 7271556Srgrimes * not a problem since the file contents are unchanged (in fact it saves 7281556Srgrimes * file space). (Except on paging files for diskless clients. But since we 7291556Srgrimes * cannot determine one of those file from here, we ignore them). If this 7301556Srgrimes * ever ends up on a system where CTG files are supported and the holes 7311556Srgrimes * are not desired, just do a conditional test in those routines that 7321556Srgrimes * call file_write() and have it call write() instead. BEFORE CLOSING THE 7331556Srgrimes * FILE, make sure to call file_flush() when the last write finishes with 734102230Strhodes * an empty block. A lot of file systems will not create an lseek hole at 7351556Srgrimes * the end. In this case we drop a single 0 at the end to force the 7361556Srgrimes * trailing 0's in the file. 7371556Srgrimes * ---Parameters--- 738102230Strhodes * rem: how many bytes left in this file system block 7391556Srgrimes * isempt: have we written to the file block yet (is it empty) 7401556Srgrimes * sz: basic file block allocation size 7411556Srgrimes * cnt: number of bytes on this write 7421556Srgrimes * str: buffer to write 7431556Srgrimes * Return: 7441556Srgrimes * number of bytes written, -1 on write (or lseek) error. 7451556Srgrimes */ 7461556Srgrimes 7471556Srgrimesint 74890113Simpfile_write(int fd, char *str, int cnt, int *rem, int *isempt, int sz, 7491556Srgrimes char *name) 7501556Srgrimes{ 75190113Simp char *pt; 75290113Simp char *end; 75390113Simp int wcnt; 75490113Simp char *st = str; 7558855Srgrimes 7561556Srgrimes /* 7571556Srgrimes * while we have data to process 7581556Srgrimes */ 7591556Srgrimes while (cnt) { 7601556Srgrimes if (!*rem) { 7611556Srgrimes /* 762102230Strhodes * We are now at the start of file system block again 7631556Srgrimes * (or what we think one is...). start looking for 7641556Srgrimes * empty blocks again 7651556Srgrimes */ 7661556Srgrimes *isempt = 1; 7671556Srgrimes *rem = sz; 7681556Srgrimes } 7691556Srgrimes 7701556Srgrimes /* 7711556Srgrimes * only examine up to the end of the current file block or 7721556Srgrimes * remaining characters to write, whatever is smaller 7731556Srgrimes */ 7741556Srgrimes wcnt = MIN(cnt, *rem); 7751556Srgrimes cnt -= wcnt; 7761556Srgrimes *rem -= wcnt; 7771556Srgrimes if (*isempt) { 7781556Srgrimes /* 7791556Srgrimes * have not written to this block yet, so we keep 7801556Srgrimes * looking for zero's 7811556Srgrimes */ 7821556Srgrimes pt = st; 7831556Srgrimes end = st + wcnt; 7841556Srgrimes 7851556Srgrimes /* 7861556Srgrimes * look for a zero filled buffer 7871556Srgrimes */ 7881556Srgrimes while ((pt < end) && (*pt == '\0')) 7891556Srgrimes ++pt; 7901556Srgrimes 7911556Srgrimes if (pt == end) { 7921556Srgrimes /* 7931556Srgrimes * skip, buf is empty so far 7941556Srgrimes */ 7951556Srgrimes if (lseek(fd, (off_t)wcnt, SEEK_CUR) < 0) { 79676017Skris syswarn(1,errno,"File seek on %s", 7971556Srgrimes name); 7981556Srgrimes return(-1); 7991556Srgrimes } 8001556Srgrimes st = pt; 8011556Srgrimes continue; 8021556Srgrimes } 8031556Srgrimes /* 8041556Srgrimes * drat, the buf is not zero filled 8051556Srgrimes */ 8061556Srgrimes *isempt = 0; 8071556Srgrimes } 8081556Srgrimes 8091556Srgrimes /* 810102230Strhodes * have non-zero data in this file system block, have to write 8111556Srgrimes */ 8121556Srgrimes if (write(fd, st, wcnt) != wcnt) { 81376017Skris syswarn(1, errno, "Failed write to file %s", name); 8141556Srgrimes return(-1); 8151556Srgrimes } 8161556Srgrimes st += wcnt; 8171556Srgrimes } 8181556Srgrimes return(st - str); 8191556Srgrimes} 8201556Srgrimes 8211556Srgrimes/* 8221556Srgrimes * file_flush() 823102230Strhodes * when the last file block in a file is zero, many file systems will not 8241556Srgrimes * let us create a hole at the end. To get the last block with zeros, we 8251556Srgrimes * write the last BYTE with a zero (back up one byte and write a zero). 8261556Srgrimes */ 8271556Srgrimes 8281556Srgrimesvoid 8291556Srgrimesfile_flush(int fd, char *fname, int isempt) 8301556Srgrimes{ 8311556Srgrimes static char blnk[] = "\0"; 8321556Srgrimes 8331556Srgrimes /* 8341556Srgrimes * silly test, but make sure we are only called when the last block is 8351556Srgrimes * filled with all zeros. 8361556Srgrimes */ 8371556Srgrimes if (!isempt) 8381556Srgrimes return; 8391556Srgrimes 8401556Srgrimes /* 8411556Srgrimes * move back one byte and write a zero 8421556Srgrimes */ 8431556Srgrimes if (lseek(fd, (off_t)-1, SEEK_CUR) < 0) { 84476017Skris syswarn(1, errno, "Failed seek on file %s", fname); 8451556Srgrimes return; 8461556Srgrimes } 8471556Srgrimes 8481556Srgrimes if (write(fd, blnk, 1) < 0) 84976017Skris syswarn(1, errno, "Failed write to file %s", fname); 8501556Srgrimes return; 8511556Srgrimes} 8521556Srgrimes 8531556Srgrimes/* 8541556Srgrimes * rdfile_close() 8551556Srgrimes * close a file we have beed reading (to copy or archive). If we have to 8561556Srgrimes * reset access time (tflag) do so (the times are stored in arcn). 8571556Srgrimes */ 8581556Srgrimes 8591556Srgrimesvoid 86090113Simprdfile_close(ARCHD *arcn, int *fd) 8611556Srgrimes{ 8621556Srgrimes /* 8631556Srgrimes * make sure the file is open 8641556Srgrimes */ 8651556Srgrimes if (*fd < 0) 8661556Srgrimes return; 8671556Srgrimes 8681556Srgrimes (void)close(*fd); 8691556Srgrimes *fd = -1; 8701556Srgrimes if (!tflag) 8711556Srgrimes return; 8721556Srgrimes 8731556Srgrimes /* 8741556Srgrimes * user wants last access time reset 8751556Srgrimes */ 8761556Srgrimes set_ftime(arcn->org_name, arcn->sb.st_mtime, arcn->sb.st_atime, 1); 8771556Srgrimes return; 8781556Srgrimes} 8791556Srgrimes 8801556Srgrimes/* 8811556Srgrimes * set_crc() 8821556Srgrimes * read a file to calculate its crc. This is a real drag. Archive formats 8831556Srgrimes * that have this, end up reading the file twice (we have to write the 8841556Srgrimes * header WITH the crc before writing the file contents. Oh well... 8851556Srgrimes * Return: 8861556Srgrimes * 0 if was able to calculate the crc, -1 otherwise 8871556Srgrimes */ 8881556Srgrimes 8891556Srgrimesint 89090113Simpset_crc(ARCHD *arcn, int fd) 8911556Srgrimes{ 89290113Simp int i; 89390113Simp int res; 8941556Srgrimes off_t cpcnt = 0L; 8951556Srgrimes u_long size; 8961556Srgrimes unsigned long crc = 0L; 8971556Srgrimes char tbuf[FILEBLK]; 8981556Srgrimes struct stat sb; 8991556Srgrimes 9001556Srgrimes if (fd < 0) { 9011556Srgrimes /* 9021556Srgrimes * hmm, no fd, should never happen. well no crc then. 9031556Srgrimes */ 9041556Srgrimes arcn->crc = 0L; 9051556Srgrimes return(0); 9061556Srgrimes } 9071556Srgrimes 9081556Srgrimes if ((size = (u_long)arcn->sb.st_blksize) > (u_long)sizeof(tbuf)) 9091556Srgrimes size = (u_long)sizeof(tbuf); 9101556Srgrimes 9111556Srgrimes /* 9121556Srgrimes * read all the bytes we think that there are in the file. If the user 9131556Srgrimes * is trying to archive an active file, forget this file. 9141556Srgrimes */ 9151556Srgrimes for(;;) { 9161556Srgrimes if ((res = read(fd, tbuf, size)) <= 0) 9171556Srgrimes break; 9181556Srgrimes cpcnt += res; 9191556Srgrimes for (i = 0; i < res; ++i) 9201556Srgrimes crc += (tbuf[i] & 0xff); 9211556Srgrimes } 9221556Srgrimes 9231556Srgrimes /* 9241556Srgrimes * safety check. we want to avoid archiving files that are active as 925222177Suqs * they can create inconsistent archive copies. 9261556Srgrimes */ 9271556Srgrimes if (cpcnt != arcn->sb.st_size) 92876017Skris paxwarn(1, "File changed size %s", arcn->org_name); 9291556Srgrimes else if (fstat(fd, &sb) < 0) 93076017Skris syswarn(1, errno, "Failed stat on %s", arcn->org_name); 9311556Srgrimes else if (arcn->sb.st_mtime != sb.st_mtime) 93276017Skris paxwarn(1, "File %s was modified during read", arcn->org_name); 9331556Srgrimes else if (lseek(fd, (off_t)0L, SEEK_SET) < 0) 93476017Skris syswarn(1, errno, "File rewind failed on: %s", arcn->org_name); 9351556Srgrimes else { 9361556Srgrimes arcn->crc = crc; 9371556Srgrimes return(0); 9381556Srgrimes } 9391556Srgrimes return(-1); 9401556Srgrimes} 941