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freebsd-skq/bin/test/test.c
sheldonh d7ad2d9d50 Take into account the fact that "[" may be called with a path, 
for example "/bin/[".

Reported by:	Vlad Skvortsov <vss@ulstu.ru>
Reported by:	Peter Jeremy <peter.jeremy@alcatel.com.au>
Message-Id:	99Dec27.111307est.40321@border.alcanet.com.au
1999-12-28 09:34:57 +00:00

479 lines
8.4 KiB
C
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/* $NetBSD: test.c,v 1.21 1999/04/05 09:48:38 kleink Exp $ */
/*
* test(1); version 7-like -- author Erik Baalbergen
* modified by Eric Gisin to be used as built-in.
* modified by Arnold Robbins to add SVR3 compatibility
* (-x -c -b -p -u -g -k) plus Korn's -L -nt -ot -ef and new -S (socket).
* modified by J.T. Conklin for NetBSD.
*
* This program is in the Public Domain.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* test(1) accepts the following grammar:
oexpr ::= aexpr | aexpr "-o" oexpr ;
aexpr ::= nexpr | nexpr "-a" aexpr ;
nexpr ::= primary | "!" primary
primary ::= unary-operator operand
| operand binary-operator operand
| operand
| "(" oexpr ")"
;
unary-operator ::= "-r"|"-w"|"-x"|"-f"|"-d"|"-c"|"-b"|"-p"|
"-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|"-L"|"-S";
binary-operator ::= "="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
"-nt"|"-ot"|"-ef";
operand ::= <any legal UNIX file name>
*/
enum token {
EOI,
FILRD,
FILWR,
FILEX,
FILEXIST,
FILREG,
FILDIR,
FILCDEV,
FILBDEV,
FILFIFO,
FILSOCK,
FILSYM,
FILGZ,
FILTT,
FILSUID,
FILSGID,
FILSTCK,
FILNT,
FILOT,
FILEQ,
FILUID,
FILGID,
STREZ,
STRNZ,
STREQ,
STRNE,
STRLT,
STRGT,
INTEQ,
INTNE,
INTGE,
INTGT,
INTLE,
INTLT,
UNOT,
BAND,
BOR,
LPAREN,
RPAREN,
OPERAND
};
enum token_types {
UNOP,
BINOP,
BUNOP,
BBINOP,
PAREN
};
struct t_op {
const char *op_text;
short op_num, op_type;
} const ops [] = {
{"-r", FILRD, UNOP},
{"-w", FILWR, UNOP},
{"-x", FILEX, UNOP},
{"-e", FILEXIST,UNOP},
{"-f", FILREG, UNOP},
{"-d", FILDIR, UNOP},
{"-c", FILCDEV,UNOP},
{"-b", FILBDEV,UNOP},
{"-p", FILFIFO,UNOP},
{"-u", FILSUID,UNOP},
{"-g", FILSGID,UNOP},
{"-k", FILSTCK,UNOP},
{"-s", FILGZ, UNOP},
{"-t", FILTT, UNOP},
{"-z", STREZ, UNOP},
{"-n", STRNZ, UNOP},
{"-h", FILSYM, UNOP}, /* for backwards compat */
{"-O", FILUID, UNOP},
{"-G", FILGID, UNOP},
{"-L", FILSYM, UNOP},
{"-S", FILSOCK,UNOP},
{"=", STREQ, BINOP},
{"!=", STRNE, BINOP},
{"<", STRLT, BINOP},
{">", STRGT, BINOP},
{"-eq", INTEQ, BINOP},
{"-ne", INTNE, BINOP},
{"-ge", INTGE, BINOP},
{"-gt", INTGT, BINOP},
{"-le", INTLE, BINOP},
{"-lt", INTLT, BINOP},
{"-nt", FILNT, BINOP},
{"-ot", FILOT, BINOP},
{"-ef", FILEQ, BINOP},
{"!", UNOT, BUNOP},
{"-a", BAND, BBINOP},
{"-o", BOR, BBINOP},
{"(", LPAREN, PAREN},
{")", RPAREN, PAREN},
{0, 0, 0}
};
struct t_op const *t_wp_op;
char **t_wp;
static void syntax __P((const char *, const char *));
static enum token t_lex __P((char *));
static int oexpr __P((enum token));
static int aexpr __P((enum token));
static int nexpr __P((enum token));
static int primary __P((enum token));
static int binop __P((void));
static int filstat __P((char *, enum token));
static int isoperand __P((void));
static int getn __P((const char *));
static int newerf __P((const char *, const char *));
static int olderf __P((const char *, const char *));
static int equalf __P((const char *, const char *));
int
main(argc, argv)
int argc;
char **argv;
{
int res;
char *p;
if ((p = rindex(argv[0], '/')) == NULL)
p = argv[0];
else
p++;
if (strcmp(p, "[") == 0) {
if (strcmp(argv[--argc], "]"))
errx(2, "missing ]");
argv[argc] = NULL;
}
/* XXX work around the absence of an eaccess(2) syscall */
(void)setgid(getegid());
(void)setuid(geteuid());
t_wp = &argv[1];
res = !oexpr(t_lex(*t_wp));
if (*t_wp != NULL && *++t_wp != NULL)
syntax(*t_wp, "unexpected operator");
return res;
}
static void
syntax(op, msg)
const char *op;
const char *msg;
{
if (op && *op)
errx(2, "%s: %s", op, msg);
else
errx(2, "%s", msg);
}
static int
oexpr(n)
enum token n;
{
int res;
res = aexpr(n);
if (t_lex(*++t_wp) == BOR)
return oexpr(t_lex(*++t_wp)) || res;
t_wp--;
return res;
}
static int
aexpr(n)
enum token n;
{
int res;
res = nexpr(n);
if (t_lex(*++t_wp) == BAND)
return aexpr(t_lex(*++t_wp)) && res;
t_wp--;
return res;
}
static int
nexpr(n)
enum token n; /* token */
{
if (n == UNOT)
return !nexpr(t_lex(*++t_wp));
return primary(n);
}
static int
primary(n)
enum token n;
{
enum token nn;
int res;
if (n == EOI)
return 0; /* missing expression */
if (n == LPAREN) {
if ((nn = t_lex(*++t_wp)) == RPAREN)
return 0; /* missing expression */
res = oexpr(nn);
if (t_lex(*++t_wp) != RPAREN)
syntax(NULL, "closing paren expected");
return res;
}
if (t_wp_op && t_wp_op->op_type == UNOP) {
/* unary expression */
if (*++t_wp == NULL)
syntax(t_wp_op->op_text, "argument expected");
switch (n) {
case STREZ:
return strlen(*t_wp) == 0;
case STRNZ:
return strlen(*t_wp) != 0;
case FILTT:
return isatty(getn(*t_wp));
default:
return filstat(*t_wp, n);
}
}
if (t_lex(t_wp[1]), t_wp_op && t_wp_op->op_type == BINOP) {
return binop();
}
return strlen(*t_wp) > 0;
}
static int
binop()
{
const char *opnd1, *opnd2;
struct t_op const *op;
opnd1 = *t_wp;
(void) t_lex(*++t_wp);
op = t_wp_op;
if ((opnd2 = *++t_wp) == NULL)
syntax(op->op_text, "argument expected");
switch (op->op_num) {
case STREQ:
return strcmp(opnd1, opnd2) == 0;
case STRNE:
return strcmp(opnd1, opnd2) != 0;
case STRLT:
return strcmp(opnd1, opnd2) < 0;
case STRGT:
return strcmp(opnd1, opnd2) > 0;
case INTEQ:
return getn(opnd1) == getn(opnd2);
case INTNE:
return getn(opnd1) != getn(opnd2);
case INTGE:
return getn(opnd1) >= getn(opnd2);
case INTGT:
return getn(opnd1) > getn(opnd2);
case INTLE:
return getn(opnd1) <= getn(opnd2);
case INTLT:
return getn(opnd1) < getn(opnd2);
case FILNT:
return newerf (opnd1, opnd2);
case FILOT:
return olderf (opnd1, opnd2);
case FILEQ:
return equalf (opnd1, opnd2);
default:
abort();
/* NOTREACHED */
}
}
static int
filstat(nm, mode)
char *nm;
enum token mode;
{
struct stat s;
if (mode == FILSYM ? lstat(nm, &s) : stat(nm, &s))
return 0;
switch (mode) {
case FILRD:
return access(nm, R_OK) == 0;
case FILWR:
return access(nm, W_OK) == 0;
case FILEX:
/* XXX work around access(2) false positives for superuser */
if (access(nm, X_OK) != 0)
return 0;
if (S_ISDIR(s.st_mode) || getuid() != 0)
return 1;
return (s.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0;
case FILEXIST:
return access(nm, F_OK) == 0;
case FILREG:
return S_ISREG(s.st_mode);
case FILDIR:
return S_ISDIR(s.st_mode);
case FILCDEV:
return S_ISCHR(s.st_mode);
case FILBDEV:
return S_ISBLK(s.st_mode);
case FILFIFO:
return S_ISFIFO(s.st_mode);
case FILSOCK:
return S_ISSOCK(s.st_mode);
case FILSYM:
return S_ISLNK(s.st_mode);
case FILSUID:
return (s.st_mode & S_ISUID) != 0;
case FILSGID:
return (s.st_mode & S_ISGID) != 0;
case FILSTCK:
return (s.st_mode & S_ISVTX) != 0;
case FILGZ:
return s.st_size > (off_t)0;
case FILUID:
return s.st_uid == geteuid();
case FILGID:
return s.st_gid == getegid();
default:
return 1;
}
}
static enum token
t_lex(s)
char *s;
{
struct t_op const *op = ops;
if (s == 0) {
t_wp_op = NULL;
return EOI;
}
while (op->op_text) {
if (strcmp(s, op->op_text) == 0) {
if ((op->op_type == UNOP && isoperand()) ||
(op->op_num == LPAREN && *(t_wp+1) == 0))
break;
t_wp_op = op;
return op->op_num;
}
op++;
}
t_wp_op = NULL;
return OPERAND;
}
static int
isoperand()
{
struct t_op const *op = ops;
char *s;
char *t;
if ((s = *(t_wp+1)) == 0)
return 1;
if ((t = *(t_wp+2)) == 0)
return 0;
while (op->op_text) {
if (strcmp(s, op->op_text) == 0)
return op->op_type == BINOP &&
(t[0] != ')' || t[1] != '\0');
op++;
}
return 0;
}
/* atoi with error detection */
static int
getn(s)
const char *s;
{
char *p;
long r;
errno = 0;
r = strtol(s, &p, 10);
if (errno != 0)
errx(2, "%s: out of range", s);
while (isspace((unsigned char)*p))
p++;
if (*p)
errx(2, "%s: bad number", s);
return (int) r;
}
static int
newerf (f1, f2)
const char *f1, *f2;
{
struct stat b1, b2;
return (stat (f1, &b1) == 0 &&
stat (f2, &b2) == 0 &&
b1.st_mtime > b2.st_mtime);
}
static int
olderf (f1, f2)
const char *f1, *f2;
{
struct stat b1, b2;
return (stat (f1, &b1) == 0 &&
stat (f2, &b2) == 0 &&
b1.st_mtime < b2.st_mtime);
}
static int
equalf (f1, f2)
const char *f1, *f2;
{
struct stat b1, b2;
return (stat (f1, &b1) == 0 &&
stat (f2, &b2) == 0 &&
b1.st_dev == b2.st_dev &&
b1.st_ino == b2.st_ino);
}
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