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/* grep-dctrl - grep Debian control files
Copyright (C) 1999, 2003, 2004 Antti-Juhani Kaijanaho
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
The author can be reached via mail at (ISO 8859-1 charset for the city)
Antti-Juhani Kaijanaho
Helokantie 1 A 16
FIN-40640 JYVÄSKYLÄ
FINLAND
EUROPE
and via electronic mail from
gaia@iki.fi
If you have a choice, use the email address; it is more likely to
stay current.
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "msg.h"
#include "fnutil.h"
#include "getaline.h"
#include "rc.h"
#include "strutil.h"
#include "util.h"
char const * const ifile_modes[] = { [m_error] = "m_error",
[m_read] = "m_read",
[m_exec] = "m_exec" };
static struct ifile parse(char * s)
{
assert(s != 0);
s = (char*)left_trimmed(s);
trim_right(s);
if (*s == 0) return (struct ifile) { .mode = m_read, .s = "-" };
static const char at_exec[] = "@exec ";
if (s[0] != '@') return (struct ifile){ .mode = m_read, .s = s };
assert(s[0] == '@');
if (s[1] == '@') return (struct ifile){ .mode = m_read, .s = s+1 };
if (strncmp(s, at_exec, sizeof at_exec - 1) == 0) {
return (struct ifile){ .mode = m_exec,
.s = s + sizeof at_exec - 1 };
}
debug_message(s, 0);
message(L_IMPORTANT, _("Malformed default input file name"), 0);
return (struct ifile){ .mode = m_error, .s = 0 };
}
static bool perms_ok(char const * fname, int fd)
{
struct stat stat;
int r = fstat(fd, &stat);
if (r == -1) {
errno_msg(L_IMPORTANT, fname);
return false;
}
if (stat.st_uid != 0 && stat.st_uid != getuid()) {
message(L_IMPORTANT, _("not owned by you or root, ignoring"),
fname);
return false;
}
if ((stat.st_mode & (S_IWGRP | S_IWOTH)) != 0) {
message(L_IMPORTANT, _("write permissions for "
"group or others, ignoring"),
fname);
return false;
}
return true;
}
struct ifile find_ifile_by_exename(const char * exename, const char * rcfname)
{
static const char * default_rcfiles [] = {
/* Order is significant: earlier files override later ones. */
"~/.grep-dctrlrc",
SYSCONF "/grep-dctrl.rc",
0 };
int i;
char * fname;
int lineno;
FILE * f;
assert(exename != 0);
if (rcfname == 0) {
struct ifile rv = { .mode = m_error, .s = 0 };
for (i = 0;
rv.mode == m_error && default_rcfiles [i] != 0;
i++) {
rv = find_ifile_by_exename(exename, default_rcfiles [i]);
}
return rv;
}
assert(rcfname != 0);
fname = fnqualify(rcfname);
if (fname == 0) {
errno_msg(L_IMPORTANT, rcfname);
return (struct ifile){ .mode = m_error, .s = 0 };
}
message(L_INFORMATIONAL, _("reading config file"), fname);
f = fopen(fname, "r");
if (f == 0) {
message(L_INFORMATIONAL, strerror(errno), fname);
return (struct ifile){ .mode = m_error, .s = 0 };
}
// check permissions
if (!perms_ok(fname, fileno(f))) {
return (struct ifile){ .mode = m_error, .s = 0 };
}
lineno = 0;
char * rv = 0;
while (1) {
static char * line = 0;
char * line_exe;
char * line_ifile;
/* If this is not the first call, line may be non-null
and must be freed. It must be freed on all
non-first iterations, too. */
free(line);
line = getaline (f);
if (line == 0) {
message(L_FATAL, _("read failure or out of memory"),
fname);
fail();
}
++lineno;
if (*line == 0) {
rv = 0;
break;
}
chop_comment(line, '#');
chomp(line);
if (left_trimmed(line) [0] == 0) {
continue;
}
line_exe = strtok(line, " \t");
if (line_exe == 0) {
line_message(L_IMPORTANT,
_("syntax error: need a executable name"),
fname, lineno);
continue;
}
line_ifile = strtok(0, "\n\t");
if (line_ifile == 0) {
line_message(L_IMPORTANT,
_("syntax error: need an input file name"),
fname, lineno);
continue;
}
message(L_INFORMATIONAL, _("considering executable name"), line_exe);
if (strcmp (exename, line_exe) == 0) {
message(L_INFORMATIONAL, _("yes, will use executable name"), line_exe);
rv = line_ifile;
message(L_INFORMATIONAL, _("default input file"), rv);
break;
}
}
fclose(f);
free(fname);
if (rv != 0) {
return parse(rv);
} else {
message(L_IMPORTANT, _("executable name not found; "
"reading from standard input"), 0);
return (struct ifile) { .mode = m_read, .s = "-" };
}
}
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