/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kevin Fall.
*
* 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.
*/
#if 0
#ifndef lint
static char const copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#endif
#ifndef lint
#if 0
static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/capsicum.h>
#include <sys/param.h>
#include <sys/stat.h>
#ifndef NO_UDOM_SUPPORT
#include <sys/socket.h>
#include <sys/un.h>
#include <netdb.h>
#endif
#include <capsicum_helpers.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
#include <libcasper.h>
#include <casper/cap_fileargs.h>
#include <casper/cap_net.h>
static int bflag, eflag, lflag, nflag, sflag, tflag, vflag;
static int rval;
static const char *filename;
static fileargs_t *fa;
static void usage(void) __dead2;
static void scanfiles(char *argv[], int cooked);
#ifndef BOOTSTRAP_CAT
static void cook_cat(FILE *);
#endif
static void raw_cat(int);
#ifndef NO_UDOM_SUPPORT
static cap_channel_t *capnet;
static int udom_open(const char *path, int flags);
#endif
/*
* Memory strategy threshold, in pages: if physmem is larger than this,
* use a large buffer.
*/
#define PHYSPAGES_THRESHOLD (32 * 1024)
/* Maximum buffer size in bytes - do not allow it to grow larger than this. */
#define BUFSIZE_MAX (2 * 1024 * 1024)
/*
* Small (default) buffer size in bytes. It's inefficient for this to be
* smaller than MAXPHYS.
*/
#define BUFSIZE_SMALL (MAXPHYS)
/*
* For the bootstrapped cat binary (needed for locked appending to METALOG), we
* disable all flags except -l and -u to avoid non-portable function calls.
* In the future we may instead want to write a small portable bootstrap tool
* that locks the output file before writing to it. However, for now
* bootstrapping cat without multibyte support is the simpler solution.
*/
#ifdef BOOTSTRAP_CAT
#define SUPPORTED_FLAGS "lu"
#else
#define SUPPORTED_FLAGS "belnstuv"
#endif
#ifndef NO_UDOM_SUPPORT
static void
init_casper_net(cap_channel_t *casper)
{
cap_net_limit_t *limit;
int familylimit;
capnet = cap_service_open(casper, "system.net");
if (capnet == NULL)
err(EXIT_FAILURE, "unable to create network service");
limit = cap_net_limit_init(capnet, CAPNET_NAME2ADDR |
CAPNET_CONNECTDNS);
if (limit == NULL)
err(EXIT_FAILURE, "unable to create limits");
familylimit = AF_LOCAL;
cap_net_limit_name2addr_family(limit, &familylimit, 1);
if (cap_net_limit(limit) < 0)
err(EXIT_FAILURE, "unable to apply limits");
}
#endif
static void
init_casper(int argc, char *argv[])
{
cap_channel_t *casper;
cap_rights_t rights;
casper = cap_init();
if (casper == NULL)
err(EXIT_FAILURE, "unable to create Casper");
fa = fileargs_cinit(casper, argc, argv, O_RDONLY, 0,
cap_rights_init(&rights, CAP_READ | CAP_FSTAT | CAP_FCNTL),
FA_OPEN | FA_REALPATH);
if (fa == NULL)
err(EXIT_FAILURE, "unable to create fileargs");
#ifndef NO_UDOM_SUPPORT
init_casper_net(casper);
#endif
cap_close(casper);
}
int
main(int argc, char *argv[])
{
int ch;
struct flock stdout_lock;
setlocale(LC_CTYPE, "");
while ((ch = getopt(argc, argv, SUPPORTED_FLAGS)) != -1)
switch (ch) {
case 'b':
bflag = nflag = 1; /* -b implies -n */
break;
case 'e':
eflag = vflag = 1; /* -e implies -v */
break;
case 'l':
lflag = 1;
break;
case 'n':
nflag = 1;
break;
case 's':
sflag = 1;
break;
case 't':
tflag = vflag = 1; /* -t implies -v */
break;
case 'u':
setbuf(stdout, NULL);
break;
case 'v':
vflag = 1;
break;
default:
usage();
}
argv += optind;
argc -= optind;
if (lflag) {
stdout_lock.l_len = 0;
stdout_lock.l_start = 0;
stdout_lock.l_type = F_WRLCK;
stdout_lock.l_whence = SEEK_SET;
if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
err(EXIT_FAILURE, "stdout");
}
init_casper(argc, argv);
caph_cache_catpages();
if (caph_enter_casper() < 0)
err(EXIT_FAILURE, "capsicum");
if (bflag || eflag || nflag || sflag || tflag || vflag)
scanfiles(argv, 1);
else
scanfiles(argv, 0);
if (fclose(stdout))
err(1, "stdout");
exit(rval);
/* NOTREACHED */
}
static void
usage(void)
{
fprintf(stderr, "usage: cat [-" SUPPORTED_FLAGS "] [file ...]\n");
exit(1);
/* NOTREACHED */
}
static void
scanfiles(char *argv[], int cooked __unused)
{
int fd, i;
char *path;
#ifndef BOOTSTRAP_CAT
FILE *fp;
#endif
i = 0;
fd = -1;
while ((path = argv[i]) != NULL || i == 0) {
if (path == NULL || strcmp(path, "-") == 0) {
filename = "stdin";
fd = STDIN_FILENO;
} else {
filename = path;
fd = fileargs_open(fa, path);
#ifndef NO_UDOM_SUPPORT
if (fd < 0 && errno == EOPNOTSUPP)
fd = udom_open(path, O_RDONLY);
#endif
}
if (fd < 0) {
warn("%s", path);
rval = 1;
#ifndef BOOTSTRAP_CAT
} else if (cooked) {
if (fd == STDIN_FILENO)
cook_cat(stdin);
else {
fp = fdopen(fd, "r");
cook_cat(fp);
fclose(fp);
}
#endif
} else {
raw_cat(fd);
if (fd != STDIN_FILENO)
close(fd);
}
if (path == NULL)
break;
++i;
}
}
#ifndef BOOTSTRAP_CAT
static void
cook_cat(FILE *fp)
{
int ch, gobble, line, prev;
wint_t wch;
/* Reset EOF condition on stdin. */
if (fp == stdin && feof(stdin))
clearerr(stdin);
line = gobble = 0;
for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
if (prev == '\n') {
if (sflag) {
if (ch == '\n') {
if (gobble)
continue;
gobble = 1;
} else
gobble = 0;
}
if (nflag) {
if (!bflag || ch != '\n') {
(void)fprintf(stdout, "%6d\t", ++line);
if (ferror(stdout))
break;
} else if (eflag) {
(void)fprintf(stdout, "%6s\t", "");
if (ferror(stdout))
break;
}
}
}
if (ch == '\n') {
if (eflag && putchar('$') == EOF)
break;
} else if (ch == '\t') {
if (tflag) {
if (putchar('^') == EOF || putchar('I') == EOF)
break;
continue;
}
} else if (vflag) {
(void)ungetc(ch, fp);
/*
* Our getwc(3) doesn't change file position
* on error.
*/
if ((wch = getwc(fp)) == WEOF) {
if (ferror(fp) && errno == EILSEQ) {
clearerr(fp);
/* Resync attempt. */
memset(&fp->_mbstate, 0, sizeof(mbstate_t));
if ((ch = getc(fp)) == EOF)
break;
wch = ch;
goto ilseq;
} else
break;
}
if (!iswascii(wch) && !iswprint(wch)) {
ilseq:
if (putchar('M') == EOF || putchar('-') == EOF)
break;
wch = toascii(wch);
}
if (iswcntrl(wch)) {
ch = toascii(wch);
ch = (ch == '\177') ? '?' : (ch | 0100);
if (putchar('^') == EOF || putchar(ch) == EOF)
break;
continue;
}
if (putwchar(wch) == WEOF)
break;
ch = -1;
continue;
}
if (putchar(ch) == EOF)
break;
}
if (ferror(fp)) {
warn("%s", filename);
rval = 1;
clearerr(fp);
}
if (ferror(stdout))
err(1, "stdout");
}
#endif /* BOOTSTRAP_CAT */
static void
raw_cat(int rfd)
{
long pagesize;
int off, wfd;
ssize_t nr, nw;
static size_t bsize;
static char *buf = NULL;
struct stat sbuf;
wfd = fileno(stdout);
if (buf == NULL) {
if (fstat(wfd, &sbuf))
err(1, "stdout");
if (S_ISREG(sbuf.st_mode)) {
/* If there's plenty of RAM, use a large copy buffer */
if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD)
bsize = MIN(BUFSIZE_MAX, MAXPHYS * 8);
else
bsize = BUFSIZE_SMALL;
} else {
bsize = sbuf.st_blksize;
pagesize = sysconf(_SC_PAGESIZE);
if (pagesize > 0)
bsize = MAX(bsize, (size_t)pagesize);
}
if ((buf = malloc(bsize)) == NULL)
err(1, "malloc() failure of IO buffer");
}
while ((nr = read(rfd, buf, bsize)) > 0)
for (off = 0; nr; nr -= nw, off += nw)
if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
err(1, "stdout");
if (nr < 0) {
warn("%s", filename);
rval = 1;
}
}
#ifndef NO_UDOM_SUPPORT
static int
udom_open(const char *path, int flags)
{
struct addrinfo hints, *res, *res0;
char rpath[PATH_MAX];
int error, fd, serrno;
cap_rights_t rights;
/*
* Construct the unix domain socket address and attempt to connect.
*/
bzero(&hints, sizeof(hints));
hints.ai_family = AF_LOCAL;
fd = -1;
if (fileargs_realpath(fa, path, rpath) == NULL)
return (-1);
error = cap_getaddrinfo(capnet, rpath, NULL, &hints, &res0);
if (error) {
warn("%s", gai_strerror(error));
errno = EINVAL;
return (-1);
}
cap_rights_init(&rights, CAP_CONNECT, CAP_READ, CAP_WRITE,
CAP_SHUTDOWN, CAP_FSTAT, CAP_FCNTL);
for (res = res0; res != NULL; res = res->ai_next) {
fd = socket(res->ai_family, res->ai_socktype,
res->ai_protocol);
if (fd < 0) {
serrno = errno;
freeaddrinfo(res0);
errno = serrno;
return (-1);
}
if (caph_rights_limit(fd, &rights) < 0) {
serrno = errno;
close(fd);
freeaddrinfo(res0);
errno = serrno;
return (-1);
}
error = cap_connect(capnet, fd, res->ai_addr, res->ai_addrlen);
if (error == 0)
break;
else {
serrno = errno;
close(fd);
fd = -1;
}
}
freeaddrinfo(res0);
/*
* handle the open flags by shutting down appropriate directions
*/
if (fd >= 0) {
switch(flags & O_ACCMODE) {
case O_RDONLY:
cap_rights_clear(&rights, CAP_WRITE);
if (shutdown(fd, SHUT_WR) == -1)
warn(NULL);
break;
case O_WRONLY:
cap_rights_clear(&rights, CAP_READ);
if (shutdown(fd, SHUT_RD) == -1)
warn(NULL);
break;
default:
break;
}
cap_rights_clear(&rights, CAP_CONNECT, CAP_SHUTDOWN);
if (caph_rights_limit(fd, &rights) < 0) {
serrno = errno;
close(fd);
errno = serrno;
return (-1);
}
} else {
errno = serrno;
}
return (fd);
}
#endif
