/* $OpenBSD: archive.c,v 1.13 2013/04/17 20:17:32 deraadt Exp $ */ /* $NetBSD: archive.c,v 1.7 1995/03/26 03:27:46 glass Exp $ */ /*- * Copyright (c) 1990, 1993, 1994 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Hugh Smith at The University of Guelph. * * 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. 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. */ #include #include #include #include #include #include #include #include #include #include #include #include "archive.h" #include "extern.h" typedef struct ar_hdr HDR; static char hb[sizeof(HDR) + 1]; /* real header */ int open_archive(int mode) { int created, fd, nr; char buf[SARMAG]; created = 0; if (mode & O_CREAT) { mode |= O_EXCL; if ((fd = open(archive, mode, DEFFILEMODE)) >= 0) { /* POSIX.2 puts create message on stderr. */ if (!(options & AR_C)) warnx("creating archive %s", archive); created = 1; goto opened; } if (errno != EEXIST) error(archive); mode &= ~O_EXCL; } if ((fd = open(archive, mode, DEFFILEMODE)) < 0) error(archive); /* * Attempt to place a lock on the opened file - if we get an * error then someone is already working on this library (or * it's going across NFS). */ opened: if (flock(fd, LOCK_EX|LOCK_NB) && errno != EOPNOTSUPP) error(archive); /* * If not created, O_RDONLY|O_RDWR indicates that it has to be * in archive format. */ if (!created && ((mode & O_ACCMODE) == O_RDONLY || (mode & O_ACCMODE) == O_RDWR)) { if ((nr = read(fd, buf, SARMAG) != SARMAG)) { if (nr >= 0) badfmt(); error(archive); } else if (bcmp(buf, ARMAG, SARMAG)) badfmt(); } else if (write(fd, ARMAG, SARMAG) != SARMAG) error(archive); return (fd); } void close_archive(int fd) { (void)close(fd); /* Implicit unlock. */ } /* Convert ar header field to an integer. */ #define AR_ATOI(from, to, len, base) { \ memmove(buf, from, len); \ buf[len] = '\0'; \ to = strtol(buf, NULL, base); \ } /* * get_arobj -- * read the archive header for this member */ int get_arobj(int fd) { struct ar_hdr *hdr; int len, nr; char *p, buf[20]; nr = read(fd, hb, sizeof(HDR)); if (nr != sizeof(HDR)) { if (!nr) return (0); if (nr < 0) error(archive); badfmt(); } hdr = (struct ar_hdr *)hb; if (strncmp(hdr->ar_fmag, ARFMAG, sizeof(ARFMAG) - 1)) badfmt(); /* Convert the header into the internal format. */ #define DECIMAL 10 #define OCTAL 8 /* XXX ar_date 2038 */ AR_ATOI(hdr->ar_date, chdr.date, sizeof(hdr->ar_date), DECIMAL); AR_ATOI(hdr->ar_uid, chdr.uid, sizeof(hdr->ar_uid), DECIMAL); AR_ATOI(hdr->ar_gid, chdr.gid, sizeof(hdr->ar_gid), DECIMAL); AR_ATOI(hdr->ar_mode, chdr.mode, sizeof(hdr->ar_mode), OCTAL); AR_ATOI(hdr->ar_size, chdr.size, sizeof(hdr->ar_size), DECIMAL); /* Leading spaces should never happen. */ if (hdr->ar_name[0] == ' ') badfmt(); /* * Long name support. Set the "real" size of the file, and the * long name flag/size. */ if (!bcmp(hdr->ar_name, AR_EFMT1, sizeof(AR_EFMT1) - 1)) { chdr.lname = len = atoi(hdr->ar_name + sizeof(AR_EFMT1) - 1); if (len <= 0 || len > MAXNAMLEN) badfmt(); nr = read(fd, chdr.name, len); if (nr != len) { if (nr < 0) error(archive); badfmt(); } chdr.name[len] = 0; chdr.size -= len; } else { chdr.lname = 0; memmove(chdr.name, hdr->ar_name, sizeof(hdr->ar_name)); /* Strip trailing spaces, null terminate. */ for (p = chdr.name + sizeof(hdr->ar_name) - 1; *p == ' '; --p); *++p = '\0'; } return (1); } static int already_written; /* * put_arobj -- * Write an archive member to a file. */ void put_arobj(CF *cfp, struct stat *sb) { int lname; char *name; struct ar_hdr *hdr; off_t size; uid_t uid; gid_t gid; /* * If passed an sb structure, reading a file from disk. Get stat(2) * information, build a name and construct a header. (Files are named * by their last component in the archive.) If not, then just write * the last header read. */ if (sb) { name = rname(cfp->rname); (void)fstat(cfp->rfd, sb); /* * If not truncating names and the name is too long or contains * a space, use extended format 1. */ lname = strlen(name); uid = sb->st_uid; gid = sb->st_gid; if (uid > USHRT_MAX) { warnx("warning: uid %u truncated to %u", uid, USHRT_MAX); uid = USHRT_MAX; } if (gid > USHRT_MAX) { warnx("warning: gid %u truncated to %u", gid, USHRT_MAX); gid = USHRT_MAX; } if (options & AR_TR) { if (lname > OLDARMAXNAME) { (void)fflush(stdout); warnx("warning: file name %s truncated to %.*s", name, OLDARMAXNAME, name); (void)fflush(stderr); } (void)snprintf(hb, sizeof hb, HDR3, name, (long long)sb->st_mtimespec.tv_sec, uid, gid, sb->st_mode, sb->st_size, ARFMAG); lname = 0; } else if (lname > sizeof(hdr->ar_name) || strchr(name, ' ')) (void)snprintf(hb, sizeof hb, HDR1, AR_EFMT1, lname, (long long)sb->st_mtimespec.tv_sec, uid, gid, sb->st_mode, sb->st_size + lname, ARFMAG); else { lname = 0; (void)snprintf(hb, sizeof hb, HDR2, name, (long long)sb->st_mtimespec.tv_sec, uid, gid, sb->st_mode, sb->st_size, ARFMAG); } size = sb->st_size; } else { lname = chdr.lname; name = chdr.name; size = chdr.size; } if (write(cfp->wfd, hb, sizeof(HDR)) != sizeof(HDR)) error(cfp->wname); if (lname) { if (write(cfp->wfd, name, lname) != lname) error(cfp->wname); already_written = lname; } copy_ar(cfp, size); already_written = 0; } /* * copy_ar -- * Copy size bytes from one file to another - taking care to handle the * extra byte (for odd size files) when reading archives and writing an * extra byte if necessary when adding files to archive. The length of * the object is the long name plus the object itself; the variable * already_written gets set if a long name was written. * * The padding is really unnecessary, and is almost certainly a remnant * of early archive formats where the header included binary data which * a PDP-11 required to start on an even byte boundary. (Or, perhaps, * because 16-bit word addressed copies were faster?) Anyhow, it should * have been ripped out long ago. */ void copy_ar(CF *cfp, off_t size) { static char pad = '\n'; off_t sz; int from, nr, nw, off, to; char buf[8*1024]; if (!(sz = size)) return; from = cfp->rfd; to = cfp->wfd; sz = size; while (sz && (nr = read(from, buf, MIN(sz, sizeof(buf)))) > 0) { sz -= nr; for (off = 0; off < nr; nr -= off, off += nw) if ((nw = write(to, buf + off, nr)) < 0) error(cfp->wname); } if (sz) { if (nr == 0) badfmt(); error(cfp->rname); } if (cfp->flags & RPAD && (size + chdr.lname) & 1 && (nr = read(from, buf, 1)) != 1) { if (nr == 0) badfmt(); error(cfp->rname); } if (cfp->flags & WPAD && (size + already_written) & 1 && write(to, &pad, 1) != 1) error(cfp->wname); } /* * skip_arobj - * Skip over an object -- taking care to skip the pad bytes. */ void skip_arobj(int fd) { off_t len; len = chdr.size + (chdr.size + chdr.lname & 1); if (lseek(fd, len, SEEK_CUR) == (off_t)-1) error(archive); }