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-rw-r--r--test.c579
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-/* vi: set sw=4 ts=4: */
-/*
- * test implementation for busybox
- *
- * Copyright (c) by a whole pile of folks:
- *
- * 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.
- * modified by Herbert Xu to be used as built-in in ash.
- * modified by Erik Andersen <andersee@debian.org> to be used
- * in busybox.
- *
- * 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; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * Original copyright notice states:
- * "This program is in the Public Domain."
- */
-
-#include <sys/types.h>
-#include <unistd.h>
-#include <ctype.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-#include "busybox.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
-};
-
-static const struct t_op {
- const char *op_text;
- short op_num, op_type;
-} 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}
-};
-
-static char **t_wp;
-static struct t_op const *t_wp_op;
-static gid_t *group_array = NULL;
-static int ngroups;
-
-static enum token t_lex(char* s);
-static int oexpr(enum token n);
-static int aexpr(enum token n);
-static int nexpr(enum token n);
-static int binop(void);
-static int primary(enum token n);
-static int filstat(char *nm, enum token mode);
-static int getn(const char *s);
-static int newerf(const char *f1, const char *f2);
-static int olderf(const char *f1, const char *f2);
-static int equalf(const char *f1, const char *f2);
-static void syntax(const char *op, const char *msg);
-static int test_eaccess(char *path, int mode);
-static int is_a_group_member(gid_t gid);
-static void initialize_group_array(void);
-
-extern int
-test_main(int argc, char** argv)
-{
- int res;
-
- if (strcmp(applet_name, "[") == 0) {
- if (strcmp(argv[--argc], "]"))
- error_msg_and_die("missing ]");
- argv[argc] = NULL;
- }
- /* Implement special cases from POSIX.2, section 4.62.4 */
- switch (argc) {
- case 1:
- exit( 1);
- case 2:
- exit (*argv[1] == '\0');
- case 3:
- if (argv[1][0] == '!' && argv[1][1] == '\0') {
- exit (!(*argv[2] == '\0'));
- }
- break;
- case 4:
- if (argv[1][0] != '!' || argv[1][1] != '\0') {
- if (t_lex(argv[2]),
- t_wp_op && t_wp_op->op_type == BINOP) {
- t_wp = &argv[1];
- exit (binop() == 0);
- }
- }
- break;
- case 5:
- if (argv[1][0] == '!' && argv[1][1] == '\0') {
- if (t_lex(argv[3]),
- t_wp_op && t_wp_op->op_type == BINOP) {
- t_wp = &argv[2];
- exit (!(binop() == 0));
- }
- }
- break;
- }
-
- t_wp = &argv[1];
- res = !oexpr(t_lex(*t_wp));
-
- if (*t_wp != NULL && *++t_wp != NULL)
- syntax(*t_wp, "unknown operand");
-
- return( res);
-}
-
-static void
-syntax(op, msg)
- const char *op;
- const char *msg;
-{
- if (op && *op)
- error_msg_and_die("%s: %s", op, msg);
- else
- error_msg_and_die("%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;
-{
- int res;
-
- if (n == EOI)
- syntax(NULL, "argument expected");
- if (n == LPAREN) {
- res = oexpr(t_lex(*++t_wp));
- 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) == (char *)0)
- 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);
- }
- /* NOTREACHED */
- return 1;
-}
-
-static int
-filstat(nm, mode)
- char *nm;
- enum token mode;
-{
- struct stat s;
- unsigned int i;
-
- if (mode == FILSYM) {
-#ifdef S_IFLNK
- if (lstat(nm, &s) == 0) {
- i = S_IFLNK;
- goto filetype;
- }
-#endif
- return 0;
- }
-
- if (stat(nm, &s) != 0)
- return 0;
-
- switch (mode) {
- case FILRD:
- return test_eaccess(nm, R_OK) == 0;
- case FILWR:
- return test_eaccess(nm, W_OK) == 0;
- case FILEX:
- return test_eaccess(nm, X_OK) == 0;
- case FILEXIST:
- return 1;
- case FILREG:
- i = S_IFREG;
- goto filetype;
- case FILDIR:
- i = S_IFDIR;
- goto filetype;
- case FILCDEV:
- i = S_IFCHR;
- goto filetype;
- case FILBDEV:
- i = S_IFBLK;
- goto filetype;
- case FILFIFO:
-#ifdef S_IFIFO
- i = S_IFIFO;
- goto filetype;
-#else
- return 0;
-#endif
- case FILSOCK:
-#ifdef S_IFSOCK
- i = S_IFSOCK;
- goto filetype;
-#else
- return 0;
-#endif
- case FILSUID:
- i = S_ISUID;
- goto filebit;
- case FILSGID:
- i = S_ISGID;
- goto filebit;
- case FILSTCK:
- i = S_ISVTX;
- goto filebit;
- case FILGZ:
- return s.st_size > 0L;
- case FILUID:
- return s.st_uid == geteuid();
- case FILGID:
- return s.st_gid == getegid();
- default:
- return 1;
- }
-
-filetype:
- return ((s.st_mode & S_IFMT) == i);
-
-filebit:
- return ((s.st_mode & i) != 0);
-}
-
-static enum token
-t_lex(s)
- char *s;
-{
- struct t_op const *op = ops;
-
- if (s == 0) {
- t_wp_op = (struct t_op *)0;
- return EOI;
- }
- while (op->op_text) {
- if (strcmp(s, op->op_text) == 0) {
- t_wp_op = op;
- return op->op_num;
- }
- op++;
- }
- t_wp_op = (struct t_op *)0;
- return OPERAND;
-}
-
-/* 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)
- error_msg_and_die("%s: out of range", s);
-
- while (isspace(*p))
- p++;
-
- if (*p)
- error_msg_and_die("%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);
-}
-
-/* Do the same thing access(2) does, but use the effective uid and gid,
- and don't make the mistake of telling root that any file is
- executable. */
-static int
-test_eaccess (path, mode)
-char *path;
-int mode;
-{
- struct stat st;
- unsigned int euid = geteuid();
-
- if (stat (path, &st) < 0)
- return (-1);
-
- if (euid == 0) {
- /* Root can read or write any file. */
- if (mode != X_OK)
- return (0);
-
- /* Root can execute any file that has any one of the execute
- bits set. */
- if (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
- return (0);
- }
-
- if (st.st_uid == euid) /* owner */
- mode <<= 6;
- else if (is_a_group_member (st.st_gid))
- mode <<= 3;
-
- if (st.st_mode & mode)
- return (0);
-
- return (-1);
-}
-
-static void
-initialize_group_array ()
-{
- ngroups = getgroups(0, NULL);
- group_array = xrealloc(group_array, ngroups * sizeof(gid_t));
- getgroups(ngroups, group_array);
-}
-
-/* Return non-zero if GID is one that we have in our groups list. */
-static int
-is_a_group_member (gid)
-gid_t gid;
-{
- register int i;
-
- /* Short-circuit if possible, maybe saving a call to getgroups(). */
- if (gid == getgid() || gid == getegid())
- return (1);
-
- if (ngroups == 0)
- initialize_group_array ();
-
- /* Search through the list looking for GID. */
- for (i = 0; i < ngroups; i++)
- if (gid == group_array[i])
- return (1);
-
- return (0);
-}