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- #include <u.h>
- #include <libc.h>
- #include <auth.h>
- #include <fcall.h>
- #include <bio.h>
- #define TBLOCK 512
- #define NBLOCK 40 /* maximum blocksize */
- #define DBLOCK 20 /* default blocksize */
- #define NAMSIZ 100
- union hblock
- {
- char dummy[TBLOCK];
- struct header
- {
- char name[NAMSIZ];
- char mode[8];
- char uid[8];
- char gid[8];
- char size[12];
- char mtime[12];
- char chksum[8];
- char linkflag;
- char linkname[NAMSIZ];
- } dbuf;
- } dblock, tbuf[NBLOCK];
- Dir *stbuf;
- Biobuf bout;
- int rflag, xflag, vflag, tflag, mt, cflag, fflag, Tflag, Rflag;
- int uflag, gflag;
- int chksum, recno, first;
- int nblock = DBLOCK;
- void usage(void);
- void dorep(char **);
- int endtar(void);
- void getdir(void);
- void passtar(void);
- void putfile(char*, char *, char *);
- void doxtract(char **);
- void dotable(void);
- void putempty(void);
- void longt(Dir *);
- int checkdir(char *, int, Qid*);
- void tomodes(Dir *);
- int checksum(void);
- int checkupdate(char *);
- int prefix(char *, char *);
- int readtar(char *);
- int writetar(char *);
- void backtar(void);
- void flushtar(void);
- void affix(int, char *);
- int volprompt(void);
- void
- main(int argc, char **argv)
- {
- char *usefile;
- char *cp, *ap;
- if (argc < 2)
- usage();
- Binit(&bout, 1, OWRITE);
- usefile = 0;
- argv[argc] = 0;
- argv++;
- for (cp = *argv++; *cp; cp++)
- switch(*cp) {
- case 'f':
- usefile = *argv++;
- if(!usefile)
- usage();
- fflag++;
- break;
- case 'u':
- ap = *argv++;
- if(!ap)
- usage();
- uflag = strtoul(ap, 0, 0);
- break;
- case 'g':
- ap = *argv++;
- if(!ap)
- usage();
- gflag = strtoul(ap, 0, 0);
- break;
- case 'c':
- cflag++;
- rflag++;
- break;
- case 'r':
- rflag++;
- break;
- case 'v':
- vflag++;
- break;
- case 'x':
- xflag++;
- break;
- case 'T':
- Tflag++;
- break;
- case 't':
- tflag++;
- break;
- case 'R':
- Rflag++;
- break;
- case '-':
- break;
- default:
- fprint(2, "tar: %c: unknown option\n", *cp);
- usage();
- }
- fmtinstall('M', dirmodefmt);
- if (rflag) {
- if (!usefile) {
- if (cflag == 0) {
- fprint(2, "tar: can only create standard output archives\n");
- exits("arg error");
- }
- mt = dup(1, -1);
- nblock = 1;
- }
- else if ((mt = open(usefile, ORDWR)) < 0) {
- if (cflag == 0 || (mt = create(usefile, OWRITE, 0666)) < 0) {
- fprint(2, "tar: cannot open %s: %r\n", usefile);
- exits("open");
- }
- }
- dorep(argv);
- }
- else if (xflag) {
- if (!usefile) {
- mt = dup(0, -1);
- nblock = 1;
- }
- else if ((mt = open(usefile, OREAD)) < 0) {
- fprint(2, "tar: cannot open %s: %r\n", usefile);
- exits("open");
- }
- doxtract(argv);
- }
- else if (tflag) {
- if (!usefile) {
- mt = dup(0, -1);
- nblock = 1;
- }
- else if ((mt = open(usefile, OREAD)) < 0) {
- fprint(2, "tar: cannot open %s: %r\n", usefile);
- exits("open");
- }
- dotable();
- }
- else
- usage();
- exits(0);
- }
- void
- usage(void)
- {
- fprint(2, "tar: usage tar {txrc}[Rvf] [tarfile] file1 file2...\n");
- exits("usage");
- }
- void
- dorep(char **argv)
- {
- char cwdbuf[2048], *cwd, thisdir[2048];
- char *cp, *cp2;
- int cd;
- if (getwd(cwdbuf, sizeof(cwdbuf)) == 0) {
- fprint(2, "tar: can't find current directory: %r\n");
- exits("cwd");
- }
- cwd = cwdbuf;
- if (!cflag) {
- getdir();
- do {
- passtar();
- getdir();
- } while (!endtar());
- }
- while (*argv) {
- cp2 = *argv;
- if (!strcmp(cp2, "-C") && argv[1]) {
- argv++;
- if (chdir(*argv) < 0)
- perror(*argv);
- cwd = *argv;
- argv++;
- continue;
- }
- cd = 0;
- for (cp = *argv; *cp; cp++)
- if (*cp == '/')
- cp2 = cp;
- if (cp2 != *argv) {
- *cp2 = '\0';
- chdir(*argv);
- if(**argv == '/')
- strncpy(thisdir, *argv, sizeof(thisdir));
- else
- snprint(thisdir, sizeof(thisdir), "%s/%s", cwd, *argv);
- *cp2 = '/';
- cp2++;
- cd = 1;
- } else
- strncpy(thisdir, cwd, sizeof(thisdir));
- putfile(thisdir, *argv++, cp2);
- if(cd && chdir(cwd) < 0) {
- fprint(2, "tar: can't cd back to %s: %r\n", cwd);
- exits("cwd");
- }
- }
- putempty();
- putempty();
- flushtar();
- }
- int
- endtar(void)
- {
- if (dblock.dbuf.name[0] == '\0') {
- backtar();
- return(1);
- }
- else
- return(0);
- }
- void
- getdir(void)
- {
- Dir *sp;
- readtar((char*)&dblock);
- if (dblock.dbuf.name[0] == '\0')
- return;
- if(stbuf == nil){
- stbuf = malloc(sizeof(Dir));
- if(stbuf == nil) {
- fprint(2, "tar: can't malloc: %r\n");
- exits("malloc");
- }
- }
- sp = stbuf;
- sp->mode = strtol(dblock.dbuf.mode, 0, 8);
- sp->uid = "adm";
- sp->gid = "adm";
- sp->length = strtol(dblock.dbuf.size, 0, 8);
- sp->mtime = strtol(dblock.dbuf.mtime, 0, 8);
- chksum = strtol(dblock.dbuf.chksum, 0, 8);
- if (chksum != checksum()) {
- fprint(2, "directory checksum error\n");
- exits("checksum error");
- }
- sp->qid.type = 0;
- /* the mode test is ugly but sometimes necessary */
- if (dblock.dbuf.linkflag == '5' || (sp->mode&0170000) == 040000) {
- sp->qid.type |= QTDIR;
- sp->mode |= DMDIR;
- }
- }
- void
- passtar(void)
- {
- long blocks;
- char buf[TBLOCK];
- if (dblock.dbuf.linkflag == '1' || dblock.dbuf.linkflag == 's')
- return;
- blocks = stbuf->length;
- blocks += TBLOCK-1;
- blocks /= TBLOCK;
- while (blocks-- > 0)
- readtar(buf);
- }
- void
- putfile(char *dir, char *longname, char *sname)
- {
- int infile;
- long blocks;
- char buf[TBLOCK];
- char curdir[4096];
- char shortname[4096];
- char *cp, *cp2;
- Dir *db;
- int i, n;
- if(strlen(sname) > sizeof shortname - 3){
- fprint(2, "tar: %s: name too long (max %d)\n", sname, sizeof shortname - 3);
- return;
- }
-
- snprint(shortname, sizeof shortname, "./%s", sname);
- infile = open(shortname, OREAD);
- if (infile < 0) {
- fprint(2, "tar: %s: cannot open file - %r\n", longname);
- return;
- }
- if(stbuf != nil)
- free(stbuf);
- stbuf = dirfstat(infile);
- if (stbuf->qid.type & QTDIR) {
- /* Directory */
- for (i = 0, cp = buf; *cp++ = longname[i++];);
- *--cp = '/';
- *++cp = 0;
- if( (cp - buf) >= NAMSIZ) {
- fprint(2, "tar: %s: file name too long\n", longname);
- close(infile);
- return;
- }
- stbuf->length = 0;
- tomodes(stbuf);
- strcpy(dblock.dbuf.name,buf);
- dblock.dbuf.linkflag = '5'; /* Directory */
- sprint(dblock.dbuf.chksum, "%6o", checksum());
- writetar( (char *) &dblock);
- if (chdir(shortname) < 0) {
- fprint(2, "tar: can't cd to %s: %r\n", shortname);
- snprint(curdir, sizeof(curdir), "cd %s", shortname);
- exits(curdir);
- }
- sprint(curdir, "%s/%s", dir, sname);
- while ((n = dirread(infile, &db)) > 0) {
- for(i = 0; i < n; i++){
- strncpy(cp, db[i].name, sizeof buf - (cp-buf));
- putfile(curdir, buf, db[i].name);
- }free(db);
- }
- close(infile);
- if (chdir(dir) < 0 && chdir("..") < 0) {
- fprint(2, "tar: can't cd to ..(%s): %r\n", dir);
- snprint(curdir, sizeof(curdir), "cd ..(%s)", dir);
- exits(curdir);
- }
- return;
- }
- tomodes(stbuf);
- cp2 = longname;
- for (cp = dblock.dbuf.name, i=0; (*cp++ = *cp2++) && i < NAMSIZ; i++);
- if (i >= NAMSIZ) {
- fprint(2, "%s: file name too long\n", longname);
- close(infile);
- return;
- }
- blocks = (stbuf->length + (TBLOCK-1)) / TBLOCK;
- if (vflag) {
- fprint(2, "a %s ", longname);
- fprint(2, "%ld blocks\n", blocks);
- }
- dblock.dbuf.linkflag = 0; /* Regular file */
- sprint(dblock.dbuf.chksum, "%6o", checksum());
- writetar( (char *) &dblock);
- while ((i = readn(infile, buf, TBLOCK)) > 0 && blocks > 0) {
- writetar(buf);
- blocks--;
- }
- close(infile);
- if (blocks != 0 || i != 0)
- fprint(2, "%s: file changed size\n", longname);
- while (blocks-- > 0)
- putempty();
- }
- void
- doxtract(char **argv)
- {
- Dir null;
- long blocks, bytes;
- char buf[TBLOCK], outname[NAMSIZ+4];
- char **cp;
- int ofile;
- for (;;) {
- getdir();
- if (endtar())
- break;
- if (*argv == 0)
- goto gotit;
- for (cp = argv; *cp; cp++)
- if (prefix(*cp, dblock.dbuf.name))
- goto gotit;
- passtar();
- continue;
- gotit:
- if(checkdir(dblock.dbuf.name, stbuf->mode, &(stbuf->qid)))
- continue;
- if (dblock.dbuf.linkflag == '1') {
- fprint(2, "tar: can't link %s %s\n",
- dblock.dbuf.linkname, dblock.dbuf.name);
- remove(dblock.dbuf.name);
- continue;
- }
- if (dblock.dbuf.linkflag == 's') {
- fprint(2, "tar: %s: cannot symlink\n", dblock.dbuf.name);
- continue;
- }
- if(dblock.dbuf.name[0] != '/' || Rflag)
- sprint(outname, "./%s", dblock.dbuf.name);
- else
- strcpy(outname, dblock.dbuf.name);
- if ((ofile = create(outname, OWRITE, stbuf->mode & 0777)) < 0) {
- fprint(2, "tar: %s - cannot create: %r\n", outname);
- passtar();
- continue;
- }
- blocks = ((bytes = stbuf->length) + TBLOCK-1)/TBLOCK;
- if (vflag)
- fprint(2, "x %s, %ld bytes\n",
- dblock.dbuf.name, bytes);
- while (blocks-- > 0) {
- readtar(buf);
- if (bytes > TBLOCK) {
- if (write(ofile, buf, TBLOCK) < 0) {
- fprint(2, "tar: %s: HELP - extract write error: %r\n", dblock.dbuf.name);
- exits("extract write");
- }
- } else
- if (write(ofile, buf, bytes) < 0) {
- fprint(2, "tar: %s: HELP - extract write error: %r\n", dblock.dbuf.name);
- exits("extract write");
- }
- bytes -= TBLOCK;
- }
- if(Tflag){
- nulldir(&null);
- null.mtime = stbuf->mtime;
- dirfwstat(ofile, &null);
- }
- close(ofile);
- }
- }
- void
- dotable(void)
- {
- for (;;) {
- getdir();
- if (endtar())
- break;
- if (vflag)
- longt(stbuf);
- Bprint(&bout, "%s", dblock.dbuf.name);
- if (dblock.dbuf.linkflag == '1')
- Bprint(&bout, " linked to %s", dblock.dbuf.linkname);
- if (dblock.dbuf.linkflag == 's')
- Bprint(&bout, " -> %s", dblock.dbuf.linkname);
- Bprint(&bout, "\n");
- passtar();
- }
- }
- void
- putempty(void)
- {
- char buf[TBLOCK];
- memset(buf, 0, TBLOCK);
- writetar(buf);
- }
- void
- longt(Dir *st)
- {
- char *cp;
- Bprint(&bout, "%M %4d/%1d ", st->mode, 0, 0); /* 0/0 uid/gid */
- Bprint(&bout, "%8lld", st->length);
- cp = ctime(st->mtime);
- Bprint(&bout, " %-12.12s %-4.4s ", cp+4, cp+24);
- }
- int
- checkdir(char *name, int mode, Qid *qid)
- {
- char *cp;
- int f;
- Dir *d, null;
- if(Rflag && *name == '/')
- name++;
- cp = name;
- if(*cp == '/')
- cp++;
- for (; *cp; cp++) {
- if (*cp == '/') {
- *cp = '\0';
- if (access(name, 0) < 0) {
- f = create(name, OREAD, DMDIR + 0775L);
- if(f < 0)
- fprint(2, "tar: mkdir %s failed: %r\n", name);
- close(f);
- }
- *cp = '/';
- }
- }
- /* if this is a directory, chmod it to the mode in the tar plus 700 */
- if(cp[-1] == '/' || (qid->type&QTDIR)){
- if((d=dirstat(name)) != 0){
- nulldir(&null);
- null.mode = DMDIR | (mode & 0777) | 0700;
- dirwstat(name, &null);
- free(d);
- }
- return 1;
- } else
- return 0;
- }
- void
- tomodes(Dir *sp)
- {
- char *cp;
- for (cp = dblock.dummy; cp < &dblock.dummy[TBLOCK]; cp++)
- *cp = '\0';
- sprint(dblock.dbuf.mode, "%6lo ", sp->mode & 0777);
- sprint(dblock.dbuf.uid, "%6o ", uflag);
- sprint(dblock.dbuf.gid, "%6o ", gflag);
- sprint(dblock.dbuf.size, "%11llo ", sp->length);
- sprint(dblock.dbuf.mtime, "%11lo ", sp->mtime);
- }
- int
- checksum(void)
- {
- int i;
- char *cp;
- for (cp = dblock.dbuf.chksum; cp < &dblock.dbuf.chksum[sizeof(dblock.dbuf.chksum)]; cp++)
- *cp = ' ';
- i = 0;
- for (cp = dblock.dummy; cp < &dblock.dummy[TBLOCK]; cp++)
- i += *cp & 0xff;
- return(i);
- }
- int
- prefix(char *s1, char *s2)
- {
- while (*s1)
- if (*s1++ != *s2++)
- return(0);
- if (*s2)
- return(*s2 == '/');
- return(1);
- }
- int
- readtar(char *buffer)
- {
- int i;
- if (recno >= nblock || first == 0) {
- if ((i = readn(mt, tbuf, TBLOCK*nblock)) <= 0) {
- fprint(2, "tar: archive read error: %r\n");
- exits("archive read");
- }
- if (first == 0) {
- if ((i % TBLOCK) != 0) {
- fprint(2, "tar: archive blocksize error: %r\n");
- exits("blocksize");
- }
- i /= TBLOCK;
- if (i != nblock) {
- fprint(2, "tar: blocksize = %d\n", i);
- nblock = i;
- }
- }
- recno = 0;
- }
- first = 1;
- memmove(buffer, &tbuf[recno++], TBLOCK);
- return(TBLOCK);
- }
- int
- writetar(char *buffer)
- {
- first = 1;
- if (recno >= nblock) {
- if (write(mt, tbuf, TBLOCK*nblock) != TBLOCK*nblock) {
- fprint(2, "tar: archive write error: %r\n");
- exits("write");
- }
- recno = 0;
- }
- memmove(&tbuf[recno++], buffer, TBLOCK);
- if (recno >= nblock) {
- if (write(mt, tbuf, TBLOCK*nblock) != TBLOCK*nblock) {
- fprint(2, "tar: archive write error: %r\n");
- exits("write");
- }
- recno = 0;
- }
- return(TBLOCK);
- }
- /*
- * backup over last tar block
- */
- void
- backtar(void)
- {
- seek(mt, -TBLOCK*nblock, 1);
- recno--;
- }
- void
- flushtar(void)
- {
- write(mt, tbuf, TBLOCK*nblock);
- }
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