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-rw-r--r--usr/dash/bltin/test.c543
1 files changed, 543 insertions, 0 deletions
diff --git a/usr/dash/bltin/test.c b/usr/dash/bltin/test.c
new file mode 100644
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+++ b/usr/dash/bltin/test.c
@@ -0,0 +1,543 @@
+/*
+ * 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.
+ */
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include "bltin.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 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}
+};
+
+static char **t_wp;
+static struct t_op const *t_wp_op;
+
+static void syntax(const char *, const char *);
+static int oexpr(enum token);
+static int aexpr(enum token);
+static int nexpr(enum token);
+static int primary(enum token);
+static int binop(void);
+static int filstat(char *, enum token);
+static enum token t_lex(char **);
+static int isoperand(char **);
+static int newerf(const char *, const char *);
+static int olderf(const char *, const char *);
+static int equalf(const char *, const char *);
+#ifdef HAVE_FACCESSAT
+static int test_file_access(const char *, int);
+#else
+static int test_st_mode(const struct stat64 *, int);
+static int bash_group_member(gid_t);
+#endif
+
+static inline intmax_t getn(const char *s)
+{
+ return atomax10(s);
+}
+
+static const struct t_op *getop(const char *s)
+{
+ const struct t_op *op;
+
+ for (op = ops; op->op_text; op++) {
+ if (strcmp(s, op->op_text) == 0)
+ return op;
+ }
+
+ return NULL;
+}
+
+int
+testcmd(int argc, char **argv)
+{
+ const struct t_op *op;
+ enum token n;
+ int res;
+
+ if (*argv[0] == '[') {
+ if (*argv[--argc] != ']')
+ error("missing ]");
+ argv[argc] = NULL;
+ }
+
+ argv++;
+ argc--;
+
+ if (argc < 1)
+ return 1;
+
+ /*
+ * POSIX prescriptions: he who wrote this deserves the Nobel
+ * peace prize.
+ */
+ switch (argc) {
+ case 3:
+ op = getop(argv[1]);
+ if (op && op->op_type == BINOP) {
+ n = OPERAND;
+ goto eval;
+ }
+ /* fall through */
+
+ case 4:
+ if (!strcmp(argv[0], "(") && !strcmp(argv[argc - 1], ")")) {
+ argv[--argc] = NULL;
+ argv++;
+ argc--;
+ }
+ }
+
+ n = t_lex(argv);
+
+eval:
+ t_wp = argv;
+ res = !oexpr(n);
+ argv = t_wp;
+
+ if (argv[0] != NULL && argv[1] != NULL)
+ syntax(argv[0], "unexpected operator");
+
+ return res;
+}
+
+static void
+syntax(const char *op, const char *msg)
+{
+ if (op && *op)
+ error("%s: %s", op, msg);
+ else
+ error("%s", msg);
+}
+
+static int
+oexpr(enum token n)
+{
+ int res = 0;
+
+ for (;;) {
+ res |= aexpr(n);
+ n = t_lex(t_wp + 1);
+ if (n != BOR)
+ break;
+ n = t_lex(t_wp += 2);
+ }
+ return res;
+}
+
+static int
+aexpr(enum token n)
+{
+ int res = 1;
+
+ for (;;) {
+ if (!nexpr(n))
+ res = 0;
+ n = t_lex(t_wp + 1);
+ if (n != BAND)
+ break;
+ n = t_lex(t_wp += 2);
+ }
+ return res;
+}
+
+static int
+nexpr(enum token n)
+{
+ if (n == UNOT)
+ return !nexpr(t_lex(++t_wp));
+ return primary(n);
+}
+
+static int
+primary(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));
+#ifdef HAVE_FACCESSAT
+ case FILRD:
+ return test_file_access(*t_wp, R_OK);
+ case FILWR:
+ return test_file_access(*t_wp, W_OK);
+ case FILEX:
+ return test_file_access(*t_wp, X_OK);
+#endif
+ 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(void)
+{
+ 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) {
+ default:
+#ifdef DEBUG
+ abort();
+ /* NOTREACHED */
+#endif
+ 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);
+ }
+}
+
+static int
+filstat(char *nm, enum token mode)
+{
+ struct stat64 s;
+
+ if (mode == FILSYM ? lstat64(nm, &s) : stat64(nm, &s))
+ return 0;
+
+ switch (mode) {
+#ifndef HAVE_FACCESSAT
+ case FILRD:
+ return test_st_mode(&s, R_OK);
+ case FILWR:
+ return test_st_mode(&s, W_OK);
+ case FILEX:
+ return test_st_mode(&s, X_OK);
+#endif
+ case FILEXIST:
+ return 1;
+ 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;
+ case FILUID:
+ return s.st_uid == geteuid();
+ case FILGID:
+ return s.st_gid == getegid();
+ default:
+ return 1;
+ }
+}
+
+static enum token t_lex(char **tp)
+{
+ struct t_op const *op;
+ char *s = *tp;
+
+ if (s == 0) {
+ t_wp_op = (struct t_op *)0;
+ return EOI;
+ }
+
+ op = getop(s);
+ if (op && !(op->op_type == UNOP && isoperand(tp)) &&
+ !(op->op_num == LPAREN && !tp[1])) {
+ t_wp_op = op;
+ return op->op_num;
+ }
+
+ t_wp_op = (struct t_op *)0;
+ return OPERAND;
+}
+
+static int isoperand(char **tp)
+{
+ struct t_op const *op;
+ char *s;
+
+ if (!(s = tp[1]))
+ return 1;
+ if (!tp[2])
+ return 0;
+
+ op = getop(s);
+ return op && op->op_type == BINOP;
+}
+
+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);
+}
+
+#ifdef HAVE_FACCESSAT
+static int test_file_access(const char *path, int mode)
+{
+ return !faccessat(AT_FDCWD, path, mode, AT_EACCESS);
+}
+#else /* HAVE_FACCESSAT */
+/*
+ * Similar to what access(2) does, but uses the effective uid and gid.
+ * Doesn't make the mistake of telling root that any file is executable.
+ * Returns non-zero if the file is accessible.
+ */
+static int
+test_st_mode(const struct stat64 *st, int mode)
+{
+ int euid = geteuid();
+
+ if (euid == 0) {
+ /* Root can read or write any file. */
+ if (mode != X_OK)
+ return 1;
+
+ /* Root can execute any file that has any one of the execute
+ bits set. */
+ mode = S_IXUSR | S_IXGRP | S_IXOTH;
+ } else if (st->st_uid == euid)
+ mode <<= 6;
+ else if (bash_group_member(st->st_gid))
+ mode <<= 3;
+
+ return st->st_mode & mode;
+}
+
+/* Return non-zero if GID is one that we have in our groups list. */
+static int
+bash_group_member(gid_t gid)
+{
+ register int i;
+ gid_t *group_array;
+ int ngroups;
+
+ /* Short-circuit if possible, maybe saving a call to getgroups(). */
+ if (gid == getgid() || gid == getegid())
+ return (1);
+
+ ngroups = getgroups(0, NULL);
+ group_array = stalloc(ngroups * sizeof(gid_t));
+ if ((getgroups(ngroups, group_array)) != ngroups)
+ return (0);
+
+ /* Search through the list looking for GID. */
+ for (i = 0; i < ngroups; i++)
+ if (gid == group_array[i])
+ return (1);
+
+ return (0);
+}
+#endif /* HAVE_FACCESSAT */
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