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4d33b62edc
freebsd-skq/bin/ls/ls.c
Robert Watson 4d33b62edc Teach "ls -Z" to use the policy-agnostic MAC label interfaces rather 
than the LOMAC-specific interfaces for listing MAC labels.  This permits
ls to view MAC labels in a manner similar to getfmac, when ls is used
with the -l argument.  Next generation LOMAC will use the MAC Framework
so should "just" work with this and other policies.  Not the prettiest
code in the world, but then, neither is ls(1).

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, Network Associates Laboratories
2002-10-24 00:07:30 +00:00

839 lines
21 KiB
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/*
* Copyright (c) 1989, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Michael Fischbein.
*
* 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
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#if 0
#ifndef lint
static char sccsid[] = "@(#)ls.c 8.5 (Berkeley) 4/2/94";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/mac.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fts.h>
#include <grp.h>
#include <limits.h>
#include <locale.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef COLORLS
#include <termcap.h>
#include <signal.h>
#endif
#include "ls.h"
#include "extern.h"
/*
* Upward approximation of the maximum number of characters needed to
* represent a value of integral type t as a string, excluding the
* NUL terminator, with provision for a sign.
*/
#define STRBUF_SIZEOF(t) (1 + CHAR_BIT * sizeof(t) / 3 + 1)
static void display(FTSENT *, FTSENT *, int);
static u_quad_t makenines(u_long);
static int mastercmp(const FTSENT * const *, const FTSENT * const *);
static void traverse(int, char **, int);
static void (*printfcn)(DISPLAY *);
static int (*sortfcn)(const FTSENT *, const FTSENT *);
long blocksize; /* block size units */
int termwidth = 80; /* default terminal width */
/* flags */
int f_accesstime; /* use time of last access */
int f_flags; /* show flags associated with a file */
int f_humanval; /* show human-readable file sizes */
int f_inode; /* print inode */
static int f_kblocks; /* print size in kilobytes */
static int f_listdir; /* list actual directory, not contents */
static int f_listdot; /* list files beginning with . */
int f_longform; /* long listing format */
int f_nonprint; /* show unprintables as ? */
static int f_nosort; /* don't sort output */
int f_notabs; /* don't use tab-separated multi-col output */
static int f_numericonly; /* don't convert uid/gid to name */
int f_octal; /* show unprintables as \xxx */
int f_octal_escape; /* like f_octal but use C escapes if possible */
static int f_recursive; /* ls subdirectories also */
static int f_reversesort; /* reverse whatever sort is used */
int f_sectime; /* print the real time for all files */
static int f_singlecol; /* use single column output */
int f_size; /* list size in short listing */
int f_slash; /* similar to f_type, but only for dirs */
int f_sortacross; /* sort across rows, not down columns */
int f_statustime; /* use time of last mode change */
int f_stream; /* stream the output, separate with commas */
static int f_timesort; /* sort by time vice name */
int f_type; /* add type character for non-regular files */
static int f_whiteout; /* show whiteout entries */
int f_label; /* show MAC label */
#ifdef COLORLS
int f_color; /* add type in color for non-regular files */
char *ansi_bgcol; /* ANSI sequence to set background colour */
char *ansi_fgcol; /* ANSI sequence to set foreground colour */
char *ansi_coloff; /* ANSI sequence to reset colours */
char *attrs_off; /* ANSI sequence to turn off attributes */
char *enter_bold; /* ANSI sequence to set color to bold mode */
#endif
static int rval;
int
main(int argc, char *argv[])
{
static char dot[] = ".", *dotav[] = {dot, NULL};
struct winsize win;
int ch, fts_options, notused;
char *p;
#ifdef COLORLS
char termcapbuf[1024]; /* termcap definition buffer */
char tcapbuf[512]; /* capability buffer */
char *bp = tcapbuf;
#endif
(void)setlocale(LC_ALL, "");
/* Terminal defaults to -Cq, non-terminal defaults to -1. */
if (isatty(STDOUT_FILENO)) {
termwidth = 80;
if ((p = getenv("COLUMNS")) != NULL && *p != '\0')
termwidth = atoi(p);
else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) != -1 &&
win.ws_col > 0)
termwidth = win.ws_col;
f_nonprint = 1;
} else {
f_singlecol = 1;
/* retrieve environment variable, in case of explicit -C */
p = getenv("COLUMNS");
if (p)
termwidth = atoi(p);
}
/* Root is -A automatically. */
if (!getuid())
f_listdot = 1;
fts_options = FTS_PHYSICAL;
while ((ch = getopt(argc, argv, "1ABCFGHLPRTWZabcdfghiklmnopqrstuwx"))
!= -1) {
switch (ch) {
/*
* The -1, -C, -x and -l options all override each other so
* shell aliasing works right.
*/
case '1':
f_singlecol = 1;
f_longform = 0;
f_stream = 0;
break;
case 'B':
f_nonprint = 0;
f_octal = 1;
f_octal_escape = 0;
break;
case 'C':
f_sortacross = f_longform = f_singlecol = 0;
break;
case 'l':
f_longform = 1;
f_singlecol = 0;
f_stream = 0;
break;
case 'x':
f_sortacross = 1;
f_longform = 0;
f_singlecol = 0;
break;
/* The -c and -u options override each other. */
case 'c':
f_statustime = 1;
f_accesstime = 0;
break;
case 'u':
f_accesstime = 1;
f_statustime = 0;
break;
case 'F':
f_type = 1;
f_slash = 0;
break;
case 'H':
fts_options |= FTS_COMFOLLOW;
break;
case 'G':
setenv("CLICOLOR", "", 1);
break;
case 'L':
fts_options &= ~FTS_PHYSICAL;
fts_options |= FTS_LOGICAL;
break;
case 'P':
fts_options &= ~FTS_COMFOLLOW;
fts_options &= ~FTS_LOGICAL;
fts_options |= FTS_PHYSICAL;
break;
case 'R':
f_recursive = 1;
break;
case 'a':
fts_options |= FTS_SEEDOT;
/* FALLTHROUGH */
case 'A':
f_listdot = 1;
break;
/* The -d option turns off the -R option. */
case 'd':
f_listdir = 1;
f_recursive = 0;
break;
case 'f':
f_nosort = 1;
break;
case 'g': /* Compatibility with 4.3BSD. */
break;
case 'h':
f_humanval = 1;
break;
case 'i':
f_inode = 1;
break;
case 'k':
f_kblocks = 1;
break;
case 'm':
f_stream = 1;
f_singlecol = 0;
f_longform = 0;
break;
case 'n':
f_numericonly = 1;
break;
case 'o':
f_flags = 1;
break;
case 'p':
f_slash = 1;
f_type = 1;
break;
case 'q':
f_nonprint = 1;
f_octal = 0;
f_octal_escape = 0;
break;
case 'r':
f_reversesort = 1;
break;
case 's':
f_size = 1;
break;
case 'T':
f_sectime = 1;
break;
case 't':
f_timesort = 1;
break;
case 'W':
f_whiteout = 1;
break;
case 'b':
f_nonprint = 0;
f_octal = 0;
f_octal_escape = 1;
break;
case 'w':
f_nonprint = 0;
f_octal = 0;
f_octal_escape = 0;
break;
case 'Z':
f_label = 1;
break;
default:
case '?':
usage();
}
}
argc -= optind;
argv += optind;
/* Enabling of colours is conditional on the environment. */
if (getenv("CLICOLOR") &&
(isatty(STDOUT_FILENO) || getenv("CLICOLOR_FORCE")))
#ifdef COLORLS
if (tgetent(termcapbuf, getenv("TERM")) == 1) {
ansi_fgcol = tgetstr("AF", &bp);
ansi_bgcol = tgetstr("AB", &bp);
attrs_off = tgetstr("me", &bp);
enter_bold = tgetstr("md", &bp);
/* To switch colours off use 'op' if
* available, otherwise use 'oc', or
* don't do colours at all. */
ansi_coloff = tgetstr("op", &bp);
if (!ansi_coloff)
ansi_coloff = tgetstr("oc", &bp);
if (ansi_fgcol && ansi_bgcol && ansi_coloff)
f_color = 1;
}
#else
(void)fprintf(stderr, "Color support not compiled in.\n");
#endif /*COLORLS*/
#ifdef COLORLS
if (f_color) {
/*
* We can't put tabs and color sequences together:
* column number will be incremented incorrectly
* for "stty oxtabs" mode.
*/
f_notabs = 1;
(void)signal(SIGINT, colorquit);
(void)signal(SIGQUIT, colorquit);
parsecolors(getenv("LSCOLORS"));
}
#endif
/*
* If not -F, -i, -l, -s or -t options, don't require stat
* information, unless in color mode in which case we do
* need this to determine which colors to display.
*/
if (!f_inode && !f_longform && !f_size && !f_timesort && !f_type
#ifdef COLORLS
&& !f_color
#endif
)
fts_options |= FTS_NOSTAT;
/*
* If not -F, -d or -l options, follow any symbolic links listed on
* the command line.
*/
if (!f_longform && !f_listdir && !f_type)
fts_options |= FTS_COMFOLLOW;
/*
* If -W, show whiteout entries
*/
#ifdef FTS_WHITEOUT
if (f_whiteout)
fts_options |= FTS_WHITEOUT;
#endif
/* If -l or -s, figure out block size. */
if (f_longform || f_size) {
if (f_kblocks)
blocksize = 2;
else {
(void)getbsize(&notused, &blocksize);
blocksize /= 512;
}
}
/* Select a sort function. */
if (f_reversesort) {
if (!f_timesort)
sortfcn = revnamecmp;
else if (f_accesstime)
sortfcn = revacccmp;
else if (f_statustime)
sortfcn = revstatcmp;
else /* Use modification time. */
sortfcn = revmodcmp;
} else {
if (!f_timesort)
sortfcn = namecmp;
else if (f_accesstime)
sortfcn = acccmp;
else if (f_statustime)
sortfcn = statcmp;
else /* Use modification time. */
sortfcn = modcmp;
}
/* Select a print function. */
if (f_singlecol)
printfcn = printscol;
else if (f_longform)
printfcn = printlong;
else if (f_stream)
printfcn = printstream;
else
printfcn = printcol;
if (argc)
traverse(argc, argv, fts_options);
else
traverse(1, dotav, fts_options);
exit(rval);
}
static int output; /* If anything output. */
/*
* Traverse() walks the logical directory structure specified by the argv list
* in the order specified by the mastercmp() comparison function. During the
* traversal it passes linked lists of structures to display() which represent
* a superset (may be exact set) of the files to be displayed.
*/
static void
traverse(int argc, char *argv[], int options)
{
FTS *ftsp;
FTSENT *p, *chp;
int ch_options;
if ((ftsp =
fts_open(argv, options, f_nosort ? NULL : mastercmp)) == NULL)
err(1, "fts_open");
display(NULL, fts_children(ftsp, 0), options);
if (f_listdir)
return;
/*
* If not recursing down this tree and don't need stat info, just get
* the names.
*/
ch_options = !f_recursive && options & FTS_NOSTAT ? FTS_NAMEONLY : 0;
while ((p = fts_read(ftsp)) != NULL)
switch (p->fts_info) {
case FTS_DC:
warnx("%s: directory causes a cycle", p->fts_name);
break;
case FTS_DNR:
case FTS_ERR:
warnx("%s: %s", p->fts_name, strerror(p->fts_errno));
rval = 1;
break;
case FTS_D:
if (p->fts_level != FTS_ROOTLEVEL &&
p->fts_name[0] == '.' && !f_listdot)
break;
/*
* If already output something, put out a newline as
* a separator. If multiple arguments, precede each
* directory with its name.
*/
if (output) {
putchar('\n');
printname(p->fts_path);
puts(":");
} else if (argc > 1) {
printname(p->fts_path);
puts(":");
output = 1;
}
chp = fts_children(ftsp, ch_options);
display(p, chp, options);
if (!f_recursive && chp != NULL)
(void)fts_set(ftsp, p, FTS_SKIP);
break;
default:
break;
}
if (errno)
err(1, "fts_read");
}
/*
* Display() takes a linked list of FTSENT structures and passes the list
* along with any other necessary information to the print function. P
* points to the parent directory of the display list.
*/
static void
display(FTSENT *p, FTSENT *list, int options)
{
struct stat *sp;
DISPLAY d;
FTSENT *cur;
NAMES *np;
off_t maxsize;
u_long btotal, labelstrlen, maxblock, maxinode, maxlen, maxnlink;
u_long maxlabelstr;
int bcfile, maxflags;
gid_t maxgroup;
uid_t maxuser;
size_t flen, ulen, glen;
char *initmax;
int entries, needstats;
const char *user, *group;
char *flags, *labelstr = NULL;
char buf[STRBUF_SIZEOF(u_quad_t) + 1];
char ngroup[STRBUF_SIZEOF(uid_t) + 1];
char nuser[STRBUF_SIZEOF(gid_t) + 1];
/*
* If list is NULL there are two possibilities: that the parent
* directory p has no children, or that fts_children() returned an
* error. We ignore the error case since it will be replicated
* on the next call to fts_read() on the post-order visit to the
* directory p, and will be signaled in traverse().
*/
if (list == NULL)
return;
needstats = f_inode || f_longform || f_size;
flen = 0;
btotal = 0;
initmax = getenv("LS_COLWIDTHS");
/* Fields match -lios order. New ones should be added at the end. */
maxlabelstr = maxblock = maxinode = maxlen = maxnlink =
maxuser = maxgroup = maxflags = maxsize = 0;
if (initmax != NULL && *initmax != '\0') {
char *initmax2, *jinitmax;
int ninitmax;
/* Fill-in "::" as "0:0:0" for the sake of scanf. */
jinitmax = initmax2 = malloc(strlen(initmax) * 2 + 2);
if (jinitmax == NULL)
err(1, "malloc");
if (*initmax == ':')
strcpy(initmax2, "0:"), initmax2 += 2;
else
*initmax2++ = *initmax, *initmax2 = '\0';
for (initmax++; *initmax != '\0'; initmax++) {
if (initmax[-1] == ':' && initmax[0] == ':') {
*initmax2++ = '0';
*initmax2++ = initmax[0];
initmax2[1] = '\0';
} else {
*initmax2++ = initmax[0];
initmax2[1] = '\0';
}
}
if (initmax2[-1] == ':')
strcpy(initmax2, "0");
ninitmax = sscanf(jinitmax,
" %lu : %lu : %lu : %i : %i : %i : %llu : %lu : %lu ",
&maxinode, &maxblock, &maxnlink, &maxuser,
&maxgroup, &maxflags, &maxsize, &maxlen, &maxlabelstr);
f_notabs = 1;
switch (ninitmax) {
case 0:
maxinode = 0;
/* FALLTHROUGH */
case 1:
maxblock = 0;
/* FALLTHROUGH */
case 2:
maxnlink = 0;
/* FALLTHROUGH */
case 3:
maxuser = 0;
/* FALLTHROUGH */
case 4:
maxgroup = 0;
/* FALLTHROUGH */
case 5:
maxflags = 0;
/* FALLTHROUGH */
case 6:
maxsize = 0;
/* FALLTHROUGH */
case 7:
maxlen = 0;
/* FALLTHROUGH */
case 8:
maxlabelstr = 0;
/* FALLTHROUGH */
#ifdef COLORLS
if (!f_color)
#endif
f_notabs = 0;
/* FALLTHROUGH */
default:
break;
}
maxinode = makenines(maxinode);
maxblock = makenines(maxblock);
maxnlink = makenines(maxnlink);
maxsize = makenines(maxsize);
}
bcfile = 0;
flags = NULL;
for (cur = list, entries = 0; cur; cur = cur->fts_link) {
if (cur->fts_info == FTS_ERR || cur->fts_info == FTS_NS) {
warnx("%s: %s",
cur->fts_name, strerror(cur->fts_errno));
cur->fts_number = NO_PRINT;
rval = 1;
continue;
}
/*
* P is NULL if list is the argv list, to which different rules
* apply.
*/
if (p == NULL) {
/* Directories will be displayed later. */
if (cur->fts_info == FTS_D && !f_listdir) {
cur->fts_number = NO_PRINT;
continue;
}
} else {
/* Only display dot file if -a/-A set. */
if (cur->fts_name[0] == '.' && !f_listdot) {
cur->fts_number = NO_PRINT;
continue;
}
}
if (cur->fts_namelen > maxlen)
maxlen = cur->fts_namelen;
if (f_octal || f_octal_escape) {
u_long t = len_octal(cur->fts_name, cur->fts_namelen);
if (t > maxlen)
maxlen = t;
}
if (needstats) {
sp = cur->fts_statp;
if (sp->st_blocks > maxblock)
maxblock = sp->st_blocks;
if (sp->st_ino > maxinode)
maxinode = sp->st_ino;
if (sp->st_nlink > maxnlink)
maxnlink = sp->st_nlink;
if (sp->st_size > maxsize)
maxsize = sp->st_size;
btotal += sp->st_blocks;
if (f_longform) {
if (f_numericonly) {
(void)snprintf(nuser, sizeof(nuser),
"%u", sp->st_uid);
(void)snprintf(ngroup, sizeof(ngroup),
"%u", sp->st_gid);
user = nuser;
group = ngroup;
} else {
user = user_from_uid(sp->st_uid, 0);
group = group_from_gid(sp->st_gid, 0);
}
if ((ulen = strlen(user)) > maxuser)
maxuser = ulen;
if ((glen = strlen(group)) > maxgroup)
maxgroup = glen;
if (f_flags) {
flags = fflagstostr(sp->st_flags);
if (flags != NULL && *flags == '\0') {
free(flags);
flags = strdup("-");
}
if (flags == NULL)
err(1, "fflagstostr");
flen = strlen(flags);
if (flen > (size_t)maxflags)
maxflags = flen;
} else
flen = 0;
labelstr = NULL;
if (f_label) {
mac_t label;
int error;
error = mac_prepare_file_label(&label);
if (error == -1) {
fprintf(stderr, "%s: %s\n",
cur->fts_name,
strerror(errno));
goto label_out;
}
if (options & FTS_LOGICAL)
error = mac_get_file(
cur->fts_path, label);
else
error = mac_get_link(
cur->fts_name, label);
if (error == -1) {
perror(cur->fts_name);
mac_free(label);
goto label_out;
}
error = mac_to_text(label,
&labelstr);
if (error == -1) {
fprintf(stderr, "%s: %s\n",
cur->fts_name,
strerror(errno));
mac_free(label);
goto label_out;
}
mac_free(label);
label_out:
if (labelstr == NULL)
labelstr = strdup("");
labelstrlen = strlen(labelstr);
if (labelstrlen > maxlabelstr)
maxlabelstr = labelstrlen;
} else
labelstrlen = 0;
if ((np = malloc(sizeof(NAMES) + labelstrlen +
ulen + glen + flen + 4)) == NULL)
err(1, "malloc");
np->user = &np->data[0];
(void)strcpy(np->user, user);
np->group = &np->data[ulen + 1];
(void)strcpy(np->group, group);
if (S_ISCHR(sp->st_mode) ||
S_ISBLK(sp->st_mode))
bcfile = 1;
if (f_flags) {
np->flags = &np->data[ulen + glen + 2];
(void)strcpy(np->flags, flags);
free(flags);
}
if (f_label) {
np->label = &np->data[ulen + glen + 2
+ (f_flags ? flen + 1 : 0)];
(void)strcpy(np->label, labelstr);
free(labelstr);
}
cur->fts_pointer = np;
}
}
++entries;
}
if (!entries)
return;
d.list = list;
d.entries = entries;
d.maxlen = maxlen;
if (needstats) {
d.bcfile = bcfile;
d.btotal = btotal;
(void)snprintf(buf, sizeof(buf), "%lu", maxblock);
d.s_block = strlen(buf);
d.s_flags = maxflags;
d.s_label = maxlabelstr;
d.s_group = maxgroup;
(void)snprintf(buf, sizeof(buf), "%lu", maxinode);
d.s_inode = strlen(buf);
(void)snprintf(buf, sizeof(buf), "%lu", maxnlink);
d.s_nlink = strlen(buf);
(void)snprintf(buf, sizeof(buf), "%qu", maxsize);
d.s_size = strlen(buf);
d.s_user = maxuser;
}
printfcn(&d);
output = 1;
if (f_longform)
for (cur = list; cur; cur = cur->fts_link)
free(cur->fts_pointer);
}
/*
* Ordering for mastercmp:
* If ordering the argv (fts_level = FTS_ROOTLEVEL) return non-directories
* as larger than directories. Within either group, use the sort function.
* All other levels use the sort function. Error entries remain unsorted.
*/
static int
mastercmp(const FTSENT * const *a, const FTSENT * const *b)
{
int a_info, b_info;
a_info = (*a)->fts_info;
if (a_info == FTS_ERR)
return (0);
b_info = (*b)->fts_info;
if (b_info == FTS_ERR)
return (0);
if (a_info == FTS_NS || b_info == FTS_NS)
return (namecmp(*a, *b));
if (a_info != b_info &&
(*a)->fts_level == FTS_ROOTLEVEL && !f_listdir) {
if (a_info == FTS_D)
return (1);
if (b_info == FTS_D)
return (-1);
}
return (sortfcn(*a, *b));
}
/*
* Makenines() returns (10**n)-1. This is useful for converting a width
* into a number that wide in decimal.
*/
static u_quad_t
makenines(u_long n)
{
u_long i;
u_quad_t reg;
reg = 1;
/* Use a loop instead of pow(), since all values of n are small. */
for (i = 0; i < n; i++)
reg *= 10;
reg--;
return reg;
}
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