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-rw-r--r--coreutils/test.c770
1 files changed, 770 insertions, 0 deletions
diff --git a/coreutils/test.c b/coreutils/test.c
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+++ b/coreutils/test.c
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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 <andersen@codepoet.org> to be used
+ * in busybox.
+ * modified by Bernhard Reutner-Fischer to be useable (i.e. a bit less bloaty).
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ *
+ * Original copyright notice states:
+ * "This program is in the Public Domain."
+ */
+
+#include "libbb.h"
+#include <setjmp.h>
+
+/* This is a NOFORK applet. Be very careful! */
+
+/* test_main() is called from shells, and we need to be extra careful here.
+ * This is true regardless of PREFER_APPLETS and STANDALONE_SHELL
+ * state. */
+
+
+/* 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>
+*/
+
+#define TEST_DEBUG 0
+
+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
+};
+#define is_int_op(a) (((unsigned char)((a) - INTEQ)) <= 5)
+#define is_str_op(a) (((unsigned char)((a) - STREZ)) <= 5)
+#define is_file_op(a) (((unsigned char)((a) - FILNT)) <= 2)
+#define is_file_access(a) (((unsigned char)((a) - FILRD)) <= 2)
+#define is_file_type(a) (((unsigned char)((a) - FILREG)) <= 5)
+#define is_file_bit(a) (((unsigned char)((a) - FILSUID)) <= 2)
+
+#if TEST_DEBUG
+int depth;
+#define nest_msg(...) do { \
+ depth++; \
+ fprintf(stderr, "%*s", depth*2, ""); \
+ fprintf(stderr, __VA_ARGS__); \
+} while (0)
+#define unnest_msg(...) do { \
+ fprintf(stderr, "%*s", depth*2, ""); \
+ fprintf(stderr, __VA_ARGS__); \
+ depth--; \
+} while (0)
+#define dbg_msg(...) do { \
+ fprintf(stderr, "%*s", depth*2, ""); \
+ fprintf(stderr, __VA_ARGS__); \
+} while (0)
+#define unnest_msg_and_return(expr, ...) do { \
+ number_t __res = (expr); \
+ fprintf(stderr, "%*s", depth*2, ""); \
+ fprintf(stderr, __VA_ARGS__, res); \
+ depth--; \
+ return __res; \
+} while (0)
+static const char *const TOKSTR[] = {
+ "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"
+};
+#else
+#define nest_msg(...) ((void)0)
+#define unnest_msg(...) ((void)0)
+#define dbg_msg(...) ((void)0)
+#define unnest_msg_and_return(expr, ...) return expr
+#endif
+
+enum token_types {
+ UNOP,
+ BINOP,
+ BUNOP,
+ BBINOP,
+ PAREN
+};
+
+struct operator_t {
+ char op_text[4];
+ unsigned char op_num, op_type;
+};
+
+static const struct operator_t 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 },
+ { "==" , 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 },
+};
+
+
+#if ENABLE_FEATURE_TEST_64
+typedef int64_t number_t;
+#else
+typedef int number_t;
+#endif
+
+
+/* We try to minimize both static and stack usage. */
+struct test_statics {
+ char **args;
+ /* set only by check_operator(), either to bogus struct
+ * or points to matching operator_t struct. Never NULL. */
+ const struct operator_t *last_operator;
+ gid_t *group_array;
+ int ngroups;
+ jmp_buf leaving;
+};
+
+/* See test_ptr_hack.c */
+extern struct test_statics *const test_ptr_to_statics;
+
+#define S (*test_ptr_to_statics)
+#define args (S.args )
+#define last_operator (S.last_operator)
+#define group_array (S.group_array )
+#define ngroups (S.ngroups )
+#define leaving (S.leaving )
+
+#define INIT_S() do { \
+ (*(struct test_statics**)&test_ptr_to_statics) = xzalloc(sizeof(S)); \
+ barrier(); \
+} while (0)
+#define DEINIT_S() do { \
+ free(test_ptr_to_statics); \
+} while (0)
+
+static number_t primary(enum token n);
+
+static void syntax(const char *op, const char *msg) NORETURN;
+static void syntax(const char *op, const char *msg)
+{
+ if (op && *op) {
+ bb_error_msg("%s: %s", op, msg);
+ } else {
+ bb_error_msg("%s: %s"+4, msg);
+ }
+ longjmp(leaving, 2);
+}
+
+/* atoi with error detection */
+//XXX: FIXME: duplicate of existing libbb function?
+static number_t getn(const char *s)
+{
+ char *p;
+#if ENABLE_FEATURE_TEST_64
+ long long r;
+#else
+ long r;
+#endif
+
+ errno = 0;
+#if ENABLE_FEATURE_TEST_64
+ r = strtoll(s, &p, 10);
+#else
+ r = strtol(s, &p, 10);
+#endif
+
+ if (errno != 0)
+ syntax(s, "out of range");
+
+ if (*(skip_whitespace(p)))
+ syntax(s, "bad number");
+
+ return r;
+}
+
+/* UNUSED
+static int newerf(const char *f1, const char *f2)
+{
+ struct stat b1, b2;
+
+ return (stat(f1, &b1) == 0 &&
+ stat(f2, &b2) == 0 && b1.st_mtime > b2.st_mtime);
+}
+
+static int olderf(const char *f1, const char *f2)
+{
+ struct stat b1, b2;
+
+ return (stat(f1, &b1) == 0 &&
+ stat(f2, &b2) == 0 && b1.st_mtime < b2.st_mtime);
+}
+
+static int equalf(const char *f1, const char *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);
+}
+*/
+
+
+static enum token check_operator(char *s)
+{
+ static const struct operator_t no_op = {
+ .op_num = -1,
+ .op_type = -1
+ };
+ const struct operator_t *op;
+
+ last_operator = &no_op;
+ if (s == NULL) {
+ return EOI;
+ }
+
+ op = ops;
+ do {
+ if (strcmp(s, op->op_text) == 0) {
+ last_operator = op;
+ return op->op_num;
+ }
+ op++;
+ } while (op < ops + ARRAY_SIZE(ops));
+
+ return OPERAND;
+}
+
+
+static int binop(void)
+{
+ const char *opnd1, *opnd2;
+ const struct operator_t *op;
+ number_t val1, val2;
+
+ opnd1 = *args;
+ check_operator(*++args);
+ op = last_operator;
+
+ opnd2 = *++args;
+ if (opnd2 == NULL)
+ syntax(op->op_text, "argument expected");
+
+ if (is_int_op(op->op_num)) {
+ val1 = getn(opnd1);
+ val2 = getn(opnd2);
+ if (op->op_num == INTEQ)
+ return val1 == val2;
+ if (op->op_num == INTNE)
+ return val1 != val2;
+ if (op->op_num == INTGE)
+ return val1 >= val2;
+ if (op->op_num == INTGT)
+ return val1 > val2;
+ if (op->op_num == INTLE)
+ return val1 <= val2;
+ if (op->op_num == INTLT)
+ return val1 < val2;
+ }
+ if (is_str_op(op->op_num)) {
+ val1 = strcmp(opnd1, opnd2);
+ if (op->op_num == STREQ)
+ return val1 == 0;
+ if (op->op_num == STRNE)
+ return val1 != 0;
+ if (op->op_num == STRLT)
+ return val1 < 0;
+ if (op->op_num == STRGT)
+ return val1 > 0;
+ }
+ /* We are sure that these three are by now the only binops we didn't check
+ * yet, so we do not check if the class is correct:
+ */
+/* if (is_file_op(op->op_num)) */
+ {
+ struct stat b1, b2;
+
+ if (stat(opnd1, &b1) || stat(opnd2, &b2))
+ return 0; /* false, since at least one stat failed */
+ if (op->op_num == FILNT)
+ return b1.st_mtime > b2.st_mtime;
+ if (op->op_num == FILOT)
+ return b1.st_mtime < b2.st_mtime;
+ if (op->op_num == FILEQ)
+ return b1.st_dev == b2.st_dev && b1.st_ino == b2.st_ino;
+ }
+ return 1; /* NOTREACHED */
+}
+
+
+static void initialize_group_array(void)
+{
+ ngroups = getgroups(0, NULL);
+ if (ngroups > 0) {
+ /* FIXME: ash tries so hard to not die on OOM,
+ * and we spoil it with just one xrealloc here */
+ /* We realloc, because test_main can be entered repeatedly by shell.
+ * Testcase (ash): 'while true; do test -x some_file; done'
+ * and watch top. (some_file must have owner != you) */
+ 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. */
+//XXX: FIXME: duplicate of existing libbb function?
+// see toplevel TODO file:
+// possible code duplication ingroup() and is_a_group_member()
+static int is_a_group_member(gid_t gid)
+{
+ 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;
+}
+
+
+/* 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(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 int filstat(char *nm, enum token mode)
+{
+ struct stat s;
+ unsigned i = i; /* gcc 3.x thinks it can be used uninitialized */
+
+ 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;
+ if (mode == FILEXIST)
+ return 1;
+ if (is_file_access(mode)) {
+ if (mode == FILRD)
+ i = R_OK;
+ if (mode == FILWR)
+ i = W_OK;
+ if (mode == FILEX)
+ i = X_OK;
+ return test_eaccess(nm, i) == 0;
+ }
+ if (is_file_type(mode)) {
+ if (mode == FILREG)
+ i = S_IFREG;
+ if (mode == FILDIR)
+ i = S_IFDIR;
+ if (mode == FILCDEV)
+ i = S_IFCHR;
+ if (mode == FILBDEV)
+ i = S_IFBLK;
+ if (mode == FILFIFO) {
+#ifdef S_IFIFO
+ i = S_IFIFO;
+#else
+ return 0;
+#endif
+ }
+ if (mode == FILSOCK) {
+#ifdef S_IFSOCK
+ i = S_IFSOCK;
+#else
+ return 0;
+#endif
+ }
+ filetype:
+ return ((s.st_mode & S_IFMT) == i);
+ }
+ if (is_file_bit(mode)) {
+ if (mode == FILSUID)
+ i = S_ISUID;
+ if (mode == FILSGID)
+ i = S_ISGID;
+ if (mode == FILSTCK)
+ i = S_ISVTX;
+ return ((s.st_mode & i) != 0);
+ }
+ if (mode == FILGZ)
+ return s.st_size > 0L;
+ if (mode == FILUID)
+ return s.st_uid == geteuid();
+ if (mode == FILGID)
+ return s.st_gid == getegid();
+ return 1; /* NOTREACHED */
+}
+
+
+static number_t nexpr(enum token n)
+{
+ number_t res;
+
+ nest_msg(">nexpr(%s)\n", TOKSTR[n]);
+ if (n == UNOT) {
+ res = !nexpr(check_operator(*++args));
+ unnest_msg("<nexpr:%lld\n", res);
+ return res;
+ }
+ res = primary(n);
+ unnest_msg("<nexpr:%lld\n", res);
+ return res;
+}
+
+
+static number_t aexpr(enum token n)
+{
+ number_t res;
+
+ nest_msg(">aexpr(%s)\n", TOKSTR[n]);
+ res = nexpr(n);
+ dbg_msg("aexpr: nexpr:%lld, next args:%s\n", res, args[1]);
+ if (check_operator(*++args) == BAND) {
+ dbg_msg("aexpr: arg is AND, next args:%s\n", args[1]);
+ res = aexpr(check_operator(*++args)) && res;
+ unnest_msg("<aexpr:%lld\n", res);
+ return res;
+ }
+ args--;
+ unnest_msg("<aexpr:%lld, args:%s\n", res, args[0]);
+ return res;
+}
+
+
+static number_t oexpr(enum token n)
+{
+ number_t res;
+
+ nest_msg(">oexpr(%s)\n", TOKSTR[n]);
+ res = aexpr(n);
+ dbg_msg("oexpr: aexpr:%lld, next args:%s\n", res, args[1]);
+ if (check_operator(*++args) == BOR) {
+ dbg_msg("oexpr: next arg is OR, next args:%s\n", args[1]);
+ res = oexpr(check_operator(*++args)) || res;
+ unnest_msg("<oexpr:%lld\n", res);
+ return res;
+ }
+ args--;
+ unnest_msg("<oexpr:%lld, args:%s\n", res, args[0]);
+ return res;
+}
+
+
+static number_t primary(enum token n)
+{
+#if TEST_DEBUG
+ number_t res = res; /* for compiler */
+#else
+ number_t res;
+#endif
+ const struct operator_t *args0_op;
+
+ nest_msg(">primary(%s)\n", TOKSTR[n]);
+ if (n == EOI) {
+ syntax(NULL, "argument expected");
+ }
+ if (n == LPAREN) {
+ res = oexpr(check_operator(*++args));
+ if (check_operator(*++args) != RPAREN)
+ syntax(NULL, "closing paren expected");
+ unnest_msg("<primary:%lld\n", res);
+ return res;
+ }
+
+ /* coreutils 6.9 checks "is args[1] binop and args[2] exist?" first,
+ * do the same */
+ args0_op = last_operator;
+ /* last_operator = operator at args[1] */
+ if (check_operator(args[1]) != EOI) { /* if args[1] != NULL */
+ if (args[2]) {
+ // coreutils also does this:
+ // if (args[3] && args[0]="-l" && args[2] is BINOP)
+ // return binop(1 /* prepended by -l */);
+ if (last_operator->op_type == BINOP)
+ unnest_msg_and_return(binop(), "<primary: binop:%lld\n");
+ }
+ }
+ /* check "is args[0] unop?" second */
+ if (args0_op->op_type == UNOP) {
+ /* unary expression */
+ if (args[1] == NULL)
+// syntax(args0_op->op_text, "argument expected");
+ goto check_emptiness;
+ args++;
+ if (n == STREZ)
+ unnest_msg_and_return(args[0][0] == '\0', "<primary:%lld\n");
+ if (n == STRNZ)
+ unnest_msg_and_return(args[0][0] != '\0', "<primary:%lld\n");
+ if (n == FILTT)
+ unnest_msg_and_return(isatty(getn(*args)), "<primary: isatty(%s)%lld\n", *args);
+ unnest_msg_and_return(filstat(*args, n), "<primary: filstat(%s):%lld\n", *args);
+ }
+
+ /*check_operator(args[1]); - already done */
+ if (last_operator->op_type == BINOP) {
+ /* args[2] is known to be NULL, isn't it bound to fail? */
+ unnest_msg_and_return(binop(), "<primary:%lld\n");
+ }
+ check_emptiness:
+ unnest_msg_and_return(args[0][0] != '\0', "<primary:%lld\n");
+}
+
+
+int test_main(int argc, char **argv)
+{
+ int res;
+ const char *arg0;
+// bool negate = 0;
+
+ arg0 = bb_basename(argv[0]);
+ if (arg0[0] == '[') {
+ --argc;
+ if (!arg0[1]) { /* "[" ? */
+ if (NOT_LONE_CHAR(argv[argc], ']')) {
+ bb_error_msg("missing ]");
+ return 2;
+ }
+ } else { /* assuming "[[" */
+ if (strcmp(argv[argc], "]]") != 0) {
+ bb_error_msg("missing ]]");
+ return 2;
+ }
+ }
+ argv[argc] = NULL;
+ }
+
+ /* We must do DEINIT_S() prior to returning */
+ INIT_S();
+
+ res = setjmp(leaving);
+ if (res)
+ goto ret;
+
+ /* resetting ngroups is probably unnecessary. it will
+ * force a new call to getgroups(), which prevents using
+ * group data fetched during a previous call. but the
+ * only way the group data could be stale is if there's
+ * been an intervening call to setgroups(), and this
+ * isn't likely in the case of a shell. paranoia
+ * prevails...
+ */
+ ngroups = 0;
+
+ //argc--;
+ argv++;
+
+ /* Implement special cases from POSIX.2, section 4.62.4 */
+ if (!argv[0]) { /* "test" */
+ res = 1;
+ goto ret;
+ }
+#if 0
+// Now it's fixed in the parser and should not be needed
+ if (LONE_CHAR(argv[0], '!') && argv[1]) {
+ negate = 1;
+ //argc--;
+ argv++;
+ }
+ if (!argv[1]) { /* "test [!] arg" */
+ res = (*argv[0] == '\0');
+ goto ret;
+ }
+ if (argv[2] && !argv[3]) {
+ check_operator(argv[1]);
+ if (last_operator->op_type == BINOP) {
+ /* "test [!] arg1 <binary_op> arg2" */
+ args = &argv[0];
+ res = (binop() == 0);
+ goto ret;
+ }
+ }
+
+ /* Some complex expression. Undo '!' removal */
+ if (negate) {
+ negate = 0;
+ //argc++;
+ argv--;
+ }
+#endif
+ args = &argv[0];
+ res = !oexpr(check_operator(*args));
+
+ if (*args != NULL && *++args != NULL) {
+ /* TODO: example when this happens? */
+ bb_error_msg("%s: unknown operand", *args);
+ res = 2;
+ }
+ ret:
+ DEINIT_S();
+// return negate ? !res : res;
+ return res;
+}