347 lines
6.8 KiB
C
347 lines
6.8 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "util.h"
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struct header {
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char name[100];
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char mode[8];
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char uid[8];
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char gid[8];
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char size[12];
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char mtime[12];
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char chksum[8];
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char type;
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char link[100];
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char magic[6];
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char version[2];
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char uname[32];
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char gname[32];
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char major[8];
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char minor[8];
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char prefix[155];
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};
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#define BLKSIZ 512
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enum Type {
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REG = '0', AREG = '\0', HARDLINK = '1', SYMLINK = '2', CHARDEV = '3',
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BLOCKDEV = '4', DIRECTORY = '5', FIFO = '6'
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};
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static FILE *tarfile;
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static ino_t tarinode;
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static dev_t tardev;
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static int mflag;
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static int fflag = 'P';
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static char filtermode;
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static FILE *
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decomp(FILE *fp)
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{
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pid_t pid;
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int fds[2];
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if (pipe(fds) < 0)
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eprintf("pipe:");
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pid = fork();
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if (pid < 0)
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eprintf("fork:");
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else if (!pid) {
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dup2(fileno(fp), 0);
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dup2(fds[1], 1);
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close(fds[0]);
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close(fds[1]);
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switch (filtermode) {
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case 'j':
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execlp("bzip2", "bzip2", "-cd", (char *)0);
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eprintf("execlp bzip2:");
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case 'z':
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execlp("gzip", "gzip", "-cd", (char *)0);
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eprintf("execlp gzip:");
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break;
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}
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}
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close(fds[1]);
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return fdopen(fds[0], "r");
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}
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static void
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putoctal(char *dst, unsigned num, int n)
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{
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snprintf(dst, n, "%.*o", n - 1, num);
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}
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static int
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archive(const char* path)
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{
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FILE *f;
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mode_t mode;
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struct group *gr;
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struct header *h;
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struct passwd *pw;
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struct stat st;
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size_t chksum, l, x;
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unsigned char b[BLKSIZ];
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lstat(path, &st);
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if (st.st_ino == tarinode && st.st_dev == tardev) {
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fprintf(stderr, "ignoring '%s'\n", path);
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return 0;
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}
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pw = getpwuid(st.st_uid);
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gr = getgrgid(st.st_gid);
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h = (void*)b;
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memset(b, 0, sizeof(b));
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snprintf(h->name, sizeof(h->name), "%s", path);
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putoctal(h->mode, (unsigned)st.st_mode & 0777, sizeof(h->mode));
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putoctal(h->uid, (unsigned)st.st_uid, sizeof(h->uid));
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putoctal(h->gid, (unsigned)st.st_gid, sizeof(h->gid));
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putoctal(h->size, 0, sizeof(h->size));
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putoctal(h->mtime, (unsigned)st.st_mtime, sizeof(h->mtime));
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memcpy(h->magic, "ustar", sizeof(h->magic));
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memcpy(h->version, "00", sizeof(h->version));
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snprintf(h->uname, sizeof h->uname, "%s", pw ? pw->pw_name : "");
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snprintf(h->gname, sizeof h->gname, "%s", gr ? gr->gr_name : "");
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mode = st.st_mode;
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if (S_ISREG(mode)) {
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h->type = REG;
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putoctal(h->size, (unsigned)st.st_size, sizeof h->size);
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f = fopen(path, "r");
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} else if (S_ISDIR(mode)) {
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h->type = DIRECTORY;
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} else if (S_ISLNK(mode)) {
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h->type = SYMLINK;
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readlink(path, h->link, (sizeof h->link)-1);
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} else if (S_ISCHR(mode) || S_ISBLK(mode)) {
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h->type = S_ISCHR(mode) ? CHARDEV : BLOCKDEV;
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#if defined(major) && defined(minor)
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putoctal(h->major, (unsigned)major(st.st_dev), sizeof h->major);
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putoctal(h->minor, (unsigned)minor(st.st_dev), sizeof h->minor);
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#else
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return 0;
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#endif
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} else if (S_ISFIFO(mode)) {
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h->type = FIFO;
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}
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memset(h->chksum, ' ', sizeof h->chksum);
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for (x = 0, chksum = 0; x < sizeof *h; x++)
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chksum += b[x];
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putoctal(h->chksum, chksum, sizeof h->chksum);
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fwrite(b, BLKSIZ, 1, tarfile);
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if (!f)
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return 0;
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while ((l = fread(b, 1, BLKSIZ, f)) > 0) {
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if (l < BLKSIZ)
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memset(b+l, 0, BLKSIZ-l);
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fwrite(b, BLKSIZ, 1, tarfile);
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}
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fclose(f);
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return 0;
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}
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static int
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unarchive(char *fname, int l, char b[BLKSIZ])
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{
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FILE *f = NULL;
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struct timeval times[2];
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struct header *h = (void*)b;
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unsigned long mode, major, minor, type, mtime;
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char lname[101];
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if (!mflag)
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mtime = strtoul(h->mtime, 0, 8);
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unlink(fname);
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switch (h->type) {
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case REG:
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case AREG:
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mode = strtoul(h->mode, 0, 8);
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if (!(f = fopen(fname, "w")) || chmod(fname, mode))
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perror(fname);
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break;
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case HARDLINK:
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case SYMLINK:
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snprintf(lname, sizeof lname, "%s", h->link);
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if (!((h->type == HARDLINK) ? link : symlink)(lname, fname))
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perror(fname);
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break;
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case DIRECTORY:
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mode = strtoul(h->mode, 0, 8);
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if (mkdir(fname, (mode_t)mode))
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perror(fname);
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break;
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case CHARDEV:
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case BLOCKDEV:
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#ifdef makedev
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mode = strtoul(h->mode, 0, 8);
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major = strtoul(h->major, 0, 8);
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minor = strtoul(h->mode, 0, 8);
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type = (h->type == CHARDEV) ? S_IFCHR : S_IFBLK;
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if (mknod(fname, type | mode, makedev(major, minor)))
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perror(fname);
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#endif
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break;
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case FIFO:
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mode = strtoul(h->mode, 0, 8);
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if (mknod(fname, S_IFIFO | mode, 0))
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perror(fname);
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break;
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default:
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fprintf(stderr, "usupported tarfiletype %c\n", h->type);
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}
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if (getuid() == 0 && chown(fname, strtoul(h->uid, 0, 8), strtoul(h->gid, 0, 8)))
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perror(fname);
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for (; l > 0; l -= BLKSIZ) {
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fread(b, BLKSIZ, 1, tarfile);
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if (f)
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fwrite(b, MIN(l, 512), 1, f);
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}
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if (f)
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fclose(f);
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if (!mflag) {
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times[0].tv_sec = times[1].tv_sec = mtime;
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times[0].tv_usec = times[1].tv_usec = 0;
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if (utimes(fname, times))
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perror(fname);
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}
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return 0;
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}
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static int
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print(char * fname, int l, char b[BLKSIZ])
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{
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puts(fname);
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for (; l > 0; l -= BLKSIZ)
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fread(b, BLKSIZ, 1, tarfile);
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return 0;
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}
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static void
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c(const char * path, int fflag)
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{
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archive(path);
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recurse(path, c, fflag);
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}
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static void
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xt(int (*fn)(char*, int, char[BLKSIZ]))
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{
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char b[BLKSIZ], fname[257], *s;
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struct header *h = (void*)b;
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while (fread(b, BLKSIZ, 1, tarfile) && h->name[0] != '\0') {
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s = fname;
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if (h->prefix[0] != '\0')
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s += sprintf(s, "%.*s/", (int)sizeof h->prefix, h->prefix);
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sprintf(s, "%.*s", (int)sizeof h->name, h->name);
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fn(fname, strtol(h->size, 0, 8), b);
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}
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}
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static void
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usage(void)
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{
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eprintf("usage: tar [-f tarfile] [-C dir] -j|z -x[m]|t\n"
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" tar [-f tarfile] [-C dir] -c dir\n");
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}
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int
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main(int argc, char *argv[])
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{
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FILE *fp;
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struct stat st;
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char *file = NULL, *dir = ".", mode = '\0';
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ARGBEGIN {
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case 'x':
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case 'c':
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case 't':
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if (mode)
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usage();
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mode = ARGC();
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break;
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case 'C':
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dir = EARGF(usage());
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break;
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case 'f':
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file = EARGF(usage());
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break;
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case 'm':
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mflag = 1;
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break;
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case 'j':
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case 'z':
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if (filtermode)
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usage();
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filtermode = ARGC();
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break;
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case 'h':
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fflag = 'L';
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break;
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default:
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usage();
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} ARGEND;
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if (!mode || argc != (mode == 'c'))
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usage();
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switch (mode) {
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case 'c':
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if (file) {
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if (!(fp = fopen(file, "w")))
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eprintf("fopen %s:", file);
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if (lstat(file, &st) < 0)
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eprintf("tar: stat '%s':", file);
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tarinode = st.st_ino;
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tardev = st.st_dev;
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tarfile = fp;
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} else {
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tarfile = stdout;
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}
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chdir(dir);
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c(argv[0], fflag);
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break;
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case 't':
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case 'x':
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if (file) {
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if (!(fp = fopen(file, "r")))
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eprintf("fopen %s:", file);
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} else {
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fp = stdin;
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}
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switch (filtermode) {
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case 'j':
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case 'z':
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tarfile = decomp(fp);
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break;
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default:
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tarfile = fp;
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break;
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}
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chdir(dir);
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xt(mode == 'x' ? unarchive : print);
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break;
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}
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return 0;
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}
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