/*-
* Copyright (c) 2015 Baptiste Daroussin <bapt@FreeBSD.org>
* Copyright (c) 2015 Xin LI <delphij@FreeBSD.org>
*
* 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
* in this position and unchanged.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/capsicum.h>
#include <sys/types.h>
#include <sys/sbuf.h>
#include <capsicum_helpers.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <xlocale.h>
typedef enum {
/* state condition to transit to next state */
INIT, /* '$' */
DELIM_SEEN, /* letter */
KEYWORD, /* punctuation mark */
PUNC_SEEN, /* ':' -> _SVN; space -> TEXT */
PUNC_SEEN_SVN, /* space */
TEXT
} analyzer_states;
static int
scan(FILE *fp, const char *name, bool quiet)
{
int c;
bool hasid = false;
bool subversion = false;
analyzer_states state = INIT;
struct sbuf *id = sbuf_new_auto();
locale_t l;
l = newlocale(LC_ALL_MASK, "C", NULL);
if (name != NULL)
printf("%s:\n", name);
while ((c = fgetc(fp)) != EOF) {
switch (state) {
case INIT:
if (c == '$') {
/* Transit to DELIM_SEEN if we see $ */
state = DELIM_SEEN;
} else {
/* Otherwise, stay in INIT state */
continue;
}
break;
case DELIM_SEEN:
if (isalpha_l(c, l)) {
/* Transit to KEYWORD if we see letter */
sbuf_clear(id);
sbuf_putc(id, '$');
sbuf_putc(id, c);
state = KEYWORD;
continue;
} else if (c == '$') {
/* Or, stay in DELIM_SEEN if more $ */
continue;
} else {
/* Otherwise, transit back to INIT */
state = INIT;
}
break;
case KEYWORD:
sbuf_putc(id, c);
if (isalpha_l(c, l)) {
/*
* Stay in KEYWORD if additional letter is seen
*/
continue;
} else if (c == ':') {
/*
* See ':' for the first time, transit to
* PUNC_SEEN.
*/
state = PUNC_SEEN;
subversion = false;
} else if (c == '$') {
/*
* Incomplete ident. Go back to DELIM_SEEN
* state because we see a '$' which could be
* the beginning of a keyword.
*/
state = DELIM_SEEN;
} else {
/*
* Go back to INIT state otherwise.
*/
state = INIT;
}
break;
case PUNC_SEEN:
case PUNC_SEEN_SVN:
sbuf_putc(id, c);
switch (c) {
case ':':
/*
* If we see '::' (seen : in PUNC_SEEN),
* activate subversion treatment and transit
* to PUNC_SEEN_SVN state.
*
* If more than two :'s were seen, the ident
* is invalid and we would therefore go back
* to INIT state.
*/
if (state == PUNC_SEEN) {
state = PUNC_SEEN_SVN;
subversion = true;
} else {
state = INIT;
}
break;
case ' ':
/*
* A space after ':' or '::' indicates we are at the
* last component of potential ident.
*/
state = TEXT;
break;
default:
/* All other characters are invalid */
state = INIT;
break;
}
break;
case TEXT:
sbuf_putc(id, c);
if (iscntrl_l(c, l)) {
/* Control characters are not allowed in this state */
state = INIT;
} else if (c == '$') {
sbuf_finish(id);
/*
* valid ident should end with a space.
*
* subversion extension uses '#' to indicate that
* the keyword expansion have exceeded the fixed
* width, so it is also permitted if we are in
* subversion mode. No length check is enforced
* because GNU RCS ident(1) does not do it either.
*/
c = sbuf_data(id)[sbuf_len(id) - 2];
if (c == ' ' || (subversion && c == '#')) {
printf(" %s\n", sbuf_data(id));
hasid = true;
}
state = INIT;
}
/* Other characters: stay in the state */
break;
}
}
sbuf_delete(id);
freelocale(l);
if (!hasid) {
if (!quiet)
fprintf(stderr, "%s warning: no id keywords in %s\n",
getprogname(), name ? name : "standard input");
return (EXIT_FAILURE);
}
return (EXIT_SUCCESS);
}
int
main(int argc, char **argv)
{
bool quiet = false;
int ch, i, *fds, fd;
int ret = EXIT_SUCCESS;
size_t nfds;
FILE *fp;
while ((ch = getopt(argc, argv, "qV")) != -1) {
switch (ch) {
case 'q':
quiet = true;
break;
case 'V':
/* Do nothing, compat with GNU rcs's ident */
return (EXIT_SUCCESS);
default:
errx(EXIT_FAILURE, "usage: %s [-q] [-V] [file...]",
getprogname());
}
}
argc -= optind;
argv += optind;
if (caph_limit_stdio() < 0)
err(EXIT_FAILURE, "unable to limit stdio");
if (argc == 0) {
nfds = 1;
fds = malloc(sizeof(*fds));
if (fds == NULL)
err(EXIT_FAILURE, "unable to allocate fds array");
fds[0] = STDIN_FILENO;
} else {
nfds = argc;
fds = malloc(sizeof(*fds) * nfds);
if (fds == NULL)
err(EXIT_FAILURE, "unable to allocate fds array");
for (i = 0; i < argc; i++) {
fds[i] = fd = open(argv[i], O_RDONLY);
if (fd < 0) {
warn("%s", argv[i]);
ret = EXIT_FAILURE;
continue;
}
if (caph_limit_stream(fd, CAPH_READ) < 0)
err(EXIT_FAILURE,
"unable to limit fcntls/rights for %s",
argv[i]);
}
}
/* Enter Capsicum sandbox. */
if (caph_enter() < 0)
err(EXIT_FAILURE, "unable to enter capability mode");
for (i = 0; i < (int)nfds; i++) {
if (fds[i] < 0)
continue;
fp = fdopen(fds[i], "r");
if (fp == NULL) {
warn("%s", argv[i]);
ret = EXIT_FAILURE;
continue;
}
if (scan(fp, argc == 0 ? NULL : argv[i], quiet) != EXIT_SUCCESS)
ret = EXIT_FAILURE;
fclose(fp);
}
return (ret);
}
