static int
herein(struct ioword *iop, char **resbuf)
{
int fd = -1;
struct shf *shf;
struct temp *h;
int i;
/* ksh -c 'cat << EOF' can cause this... */
if (iop->heredoc == NULL) {
warningf(true, "%s missing", "here document");
/* special to iosetup(): don't print error */
return (-2);
}
/* lexer substitution flags */
i = (iop->flag & IOEVAL) ? (ONEWORD | HEREDOC) : 0;
/* skip all the fd setup if we just want the value */
if (resbuf != NULL)
return (hereinval(iop->heredoc, i, resbuf, NULL));
/*
* Create temp file to hold content (done before newenv
* so temp doesn't get removed too soon).
*/
h = maketemp(ATEMP, TT_HEREDOC_EXP, &e->temps);
if (!(shf = h->shf) || (fd = open(h->tffn, O_RDONLY, 0)) < 0) {
i = errno;
warningf(true, "can't %s temporary file %s: %s",
!shf ? "create" : "open", h->tffn, cstrerror(i));
if (shf)
shf_close(shf);
/* special to iosetup(): don't print error */
return (-2);
}
if (hereinval(iop->heredoc, i, NULL, shf) == -2) {
close(fd);
/* special to iosetup(): don't print error */
return (-2);
}
if (shf_close(shf) == EOF) {
i = errno;
close(fd);
warningf(true, "can't %s temporary file %s: %s",
"write", h->tffn, cstrerror(i));
/* special to iosetup(): don't print error */
return (-2);
}
return (fd);
}
int mkdir_p(char *pathname) {
char *p, errbuf[MAX_LINE];
if (pathname == NULL)
return -1;
if (!*pathname)
return 0;
p = pathname;
while((p = cstrchr(p, '/')) != NULL) {
*p = 0;
if (!*pathname) {
*p = '/';
p++;
continue;
}
if (make_dir(pathname, (mode_t)0750) == -1) {
*p = '/';
p++;
if (errno == EEXIST)
continue;
log_err("mkdir_p(): failed to create directory %s : %s", pathname, cstrerror(errno, errbuf, MAX_LINE));
return -1;
}
*p = '/';
p++;
}
if (make_dir(pathname, (mode_t)0750) == -1) {
if (errno == EEXIST)
return 0;
log_err("mkdir_p(): failed to create directory %s : %s", pathname, cstrerror(errno, errbuf, MAX_LINE));
return -1;
}
return 0;
}
static void
scriptexec(struct op *tp, const char **ap)
{
const char *sh;
#ifndef MKSH_SMALL
unsigned char *cp;
/* 64 == MAXINTERP in MirBSD <sys/param.h> */
char buf[64];
int fd;
#endif
union mksh_ccphack args, cap;
sh = str_val(global("EXECSHELL"));
if (sh && *sh)
sh = search_path(sh, path, X_OK, NULL);
if (!sh || !*sh)
sh = MKSH_DEFAULT_EXECSHELL;
*tp->args-- = tp->str;
#ifndef MKSH_SMALL
if ((fd = open(tp->str, O_RDONLY)) >= 0) {
/* read first MAXINTERP octets from file */
if (read(fd, buf, sizeof(buf)) <= 0)
/* read error -> no good */
buf[0] = '\0';
close(fd);
/* skip UTF-8 Byte Order Mark, if present */
cp = (unsigned char *)buf;
if ((cp[0] == 0xEF) && (cp[1] == 0xBB) && (cp[2] == 0xBF))
cp += 3;
/* save begin of shebang for later */
fd = (char *)cp - buf; /* either 0 or (if BOM) 3 */
/* scan for newline (or CR) or NUL _before_ end of buffer */
while ((char *)cp < (buf + sizeof(buf)))
if (*cp == '\0' || *cp == '\n' || *cp == '\r') {
*cp = '\0';
break;
} else
++cp;
/* if the shebang line is longer than MAXINTERP, bail out */
if ((char *)cp >= (buf + sizeof(buf)))
goto noshebang;
/* restore begin of shebang position (buf+0 or buf+3) */
cp = (unsigned char *)(buf + fd);
/* bail out if read error (above) or no shebang */
if ((cp[0] != '#') || (cp[1] != '!'))
goto noshebang;
cp += 2;
/* skip whitespace before shell name */
while (*cp == ' ' || *cp == '\t')
++cp;
/* just whitespace on the line? */
if (*cp == '\0')
goto noshebang;
/* no, we actually found an interpreter name */
sh = (char *)cp;
/* look for end of shell/interpreter name */
while (*cp != ' ' && *cp != '\t' && *cp != '\0')
++cp;
/* any arguments? */
if (*cp) {
*cp++ = '\0';
/* skip spaces before arguments */
while (*cp == ' ' || *cp == '\t')
++cp;
/* pass it all in ONE argument (historic reasons) */
if (*cp)
*tp->args-- = (char *)cp;
}
noshebang:
fd = buf[0] << 8 | buf[1];
if ((fd == /* OMAGIC */ 0407) ||
(fd == /* NMAGIC */ 0410) ||
(fd == /* ZMAGIC */ 0413) ||
(fd == /* QMAGIC */ 0314) ||
(fd == /* ECOFF_I386 */ 0x4C01) ||
(fd == /* ECOFF_M68K */ 0x0150 || fd == 0x5001) ||
(fd == /* ECOFF_SH */ 0x0500 || fd == 0x0005) ||
(fd == 0x7F45 && buf[2] == 'L' && buf[3] == 'F') ||
(fd == /* "MZ" */ 0x4D5A) ||
(fd == /* gzip */ 0x1F8B))
errorf("%s: not executable: magic %04X", tp->str, fd);
}
#endif
args.ro = tp->args;
*args.ro = sh;
cap.ro = ap;
execve(args.rw[0], args.rw, cap.rw);
/* report both the programme that was run and the bogus interpreter */
errorf("%s: %s: %s", tp->str, sh, cstrerror(errno));
}
static int
comexec(struct op *t, struct tbl * volatile tp, const char **ap,
volatile int flags, volatile int *xerrok)
{
int i;
volatile int rv = 0;
const char *cp;
const char **lastp;
/* Must be static (XXX but why?) */
static struct op texec;
int type_flags;
bool keepasn_ok;
int fcflags = FC_BI|FC_FUNC|FC_PATH;
bool bourne_function_call = false;
struct block *l_expand, *l_assign;
/*
* snag the last argument for $_ XXX not the same as AT&T ksh,
* which only seems to set $_ after a newline (but not in
* functions/dot scripts, but in interactive and script) -
* perhaps save last arg here and set it in shell()?.
*/
if (Flag(FTALKING) && *(lastp = ap)) {
while (*++lastp)
;
/* setstr() can't fail here */
setstr(typeset("_", LOCAL, 0, INTEGER, 0), *--lastp,
KSH_RETURN_ERROR);
}
/**
* Deal with the shell builtins builtin, exec and command since
* they can be followed by other commands. This must be done before
* we know if we should create a local block which must be done
* before we can do a path search (in case the assignments change
* PATH).
* Odd cases:
* FOO=bar exec >/dev/null FOO is kept but not exported
* FOO=bar exec foobar FOO is exported
* FOO=bar command exec >/dev/null FOO is neither kept nor exported
* FOO=bar command FOO is neither kept nor exported
* PATH=... foobar use new PATH in foobar search
*/
keepasn_ok = true;
while (tp && tp->type == CSHELL) {
/* undo effects of command */
fcflags = FC_BI|FC_FUNC|FC_PATH;
if (tp->val.f == c_builtin) {
if ((cp = *++ap) == NULL ||
(!strcmp(cp, "--") && (cp = *++ap) == NULL)) {
tp = NULL;
break;
}
if ((tp = findcom(cp, FC_BI)) == NULL)
errorf("%s: %s: %s", Tbuiltin, cp, "not a builtin");
continue;
} else if (tp->val.f == c_exec) {
if (ap[1] == NULL)
break;
ap++;
flags |= XEXEC;
} else if (tp->val.f == c_command) {
int optc, saw_p = 0;
/*
* Ugly dealing with options in two places (here
* and in c_command(), but such is life)
*/
ksh_getopt_reset(&builtin_opt, 0);
while ((optc = ksh_getopt(ap, &builtin_opt, ":p")) == 'p')
saw_p = 1;
if (optc != EOF)
/* command -vV or something */
break;
/* don't look for functions */
fcflags = FC_BI|FC_PATH;
if (saw_p) {
if (Flag(FRESTRICTED)) {
warningf(true, "%s: %s",
"command -p", "restricted");
rv = 1;
goto Leave;
}
fcflags |= FC_DEFPATH;
}
ap += builtin_opt.optind;
/*
* POSIX says special builtins lose their status
* if accessed using command.
*/
keepasn_ok = false;
if (!ap[0]) {
/* ensure command with no args exits with 0 */
subst_exstat = 0;
break;
}
#ifndef MKSH_NO_EXTERNAL_CAT
} else if (tp->val.f == c_cat) {
/*
* if we have any flags, do not use the builtin
* in theory, we could allow -u, but that would
* mean to use ksh_getopt here and possibly ad-
* ded complexity and more code and isn't worth
* additional hassle (and the builtin must call
* ksh_getopt already but can't come back here)
*/
if (ap[1] && ap[1][0] == '-' && ap[1][1] != '\0' &&
/* argument, begins with -, is not - or -- */
(ap[1][1] != '-' || ap[1][2] != '\0'))
/* don't look for builtins or functions */
fcflags = FC_PATH;
else
/* go on, use the builtin */
break;
#endif
#if !defined(MKSH_SMALL)
} else if (tp->val.f == c_trap) {
t->u.evalflags &= ~DOTCOMEXEC;
break;
#endif
} else
break;
tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC));
}
#if !defined(MKSH_SMALL)
if (t->u.evalflags & DOTCOMEXEC)
flags |= XEXEC;
#endif
l_expand = e->loc;
if (keepasn_ok && (!ap[0] || (tp && (tp->flag & KEEPASN))))
type_flags = 0;
else {
/* create new variable/function block */
newblock();
/* ksh functions don't keep assignments, POSIX functions do. */
if (keepasn_ok && tp && tp->type == CFUNC &&
!(tp->flag & FKSH)) {
bourne_function_call = true;
type_flags = EXPORT;
} else
type_flags = LOCAL|LOCAL_COPY|EXPORT;
}
l_assign = e->loc;
if (Flag(FEXPORT))
type_flags |= EXPORT;
for (i = 0; t->vars[i]; i++) {
/* do NOT lookup in the new var/fn block just created */
e->loc = l_expand;
cp = evalstr(t->vars[i], DOASNTILDE);
e->loc = l_assign;
/* but assign in there as usual */
if (Flag(FXTRACE)) {
if (i == 0)
shf_puts(substitute(str_val(global("PS4")), 0),
shl_out);
shf_fprintf(shl_out, "%s%c", cp,
t->vars[i + 1] ? ' ' : '\n');
if (!t->vars[i + 1])
shf_flush(shl_out);
}
typeset(cp, type_flags, 0, 0, 0);
if (bourne_function_call && !(type_flags & EXPORT))
typeset(cp, LOCAL|LOCAL_COPY|EXPORT, 0, 0, 0);
}
if ((cp = *ap) == NULL) {
rv = subst_exstat;
goto Leave;
} else if (!tp) {
if (Flag(FRESTRICTED) && vstrchr(cp, '/')) {
warningf(true, "%s: %s", cp, "restricted");
rv = 1;
goto Leave;
}
tp = findcom(cp, fcflags);
}
switch (tp->type) {
/* shell built-in */
case CSHELL:
rv = call_builtin(tp, (const char **)ap, null);
if (!keepasn_ok && tp->val.f == c_shift) {
l_expand->argc = l_assign->argc;
l_expand->argv = l_assign->argv;
}
break;
/* function call */
case CFUNC: {
volatile unsigned char old_xflag;
volatile uint32_t old_inuse;
const char * volatile old_kshname;
if (!(tp->flag & ISSET)) {
struct tbl *ftp;
if (!tp->u.fpath) {
rv = (tp->u2.errnov == ENOENT) ? 127 : 126;
warningf(true, "%s: %s %s: %s", cp,
"can't find", "function definition file",
cstrerror(tp->u2.errnov));
break;
}
if (include(tp->u.fpath, 0, NULL, false) < 0) {
rv = errno;
warningf(true, "%s: %s %s %s: %s", cp,
"can't open", "function definition file",
tp->u.fpath, cstrerror(rv));
rv = 127;
break;
}
if (!(ftp = findfunc(cp, hash(cp), false)) ||
!(ftp->flag & ISSET)) {
warningf(true, "%s: %s %s", cp,
"function not defined by", tp->u.fpath);
rv = 127;
break;
}
tp = ftp;
}
/*
* ksh functions set $0 to function name, POSIX
* functions leave $0 unchanged.
*/
old_kshname = kshname;
if (tp->flag & FKSH)
kshname = ap[0];
else
ap[0] = kshname;
e->loc->argv = ap;
for (i = 0; *ap++ != NULL; i++)
;
e->loc->argc = i - 1;
/*
* ksh-style functions handle getopts sanely,
* Bourne/POSIX functions are insane...
*/
if (tp->flag & FKSH) {
e->loc->flags |= BF_DOGETOPTS;
e->loc->getopts_state = user_opt;
getopts_reset(1);
}
old_xflag = Flag(FXTRACE);
Flag(FXTRACE) |= tp->flag & TRACE ? 1 : 0;
old_inuse = tp->flag & FINUSE;
tp->flag |= FINUSE;
e->type = E_FUNC;
if (!(i = kshsetjmp(e->jbuf))) {
execute(tp->val.t, flags & XERROK, NULL);
i = LRETURN;
}
kshname = old_kshname;
Flag(FXTRACE) = old_xflag;
tp->flag = (tp->flag & ~FINUSE) | old_inuse;
/*
* Were we deleted while executing? If so, free the
* execution tree. TODO: Unfortunately, the table entry
* is never re-used until the lookup table is expanded.
*/
if ((tp->flag & (FDELETE|FINUSE)) == FDELETE) {
if (tp->flag & ALLOC) {
tp->flag &= ~ALLOC;
tfree(tp->val.t, tp->areap);
}
tp->flag = 0;
}
switch (i) {
case LRETURN:
case LERROR:
rv = exstat & 0xFF;
break;
case LINTR:
case LEXIT:
case LLEAVE:
case LSHELL:
quitenv(NULL);
unwind(i);
/* NOTREACHED */
default:
quitenv(NULL);
internal_errorf("%s %d", "CFUNC", i);
}
break;
}
/* executable command */
case CEXEC:
/* tracked alias */
case CTALIAS:
if (!(tp->flag&ISSET)) {
if (tp->u2.errnov == ENOENT) {
rv = 127;
warningf(true, "%s: %s", cp, "not found");
} else {
rv = 126;
warningf(true, "%s: %s: %s", cp, "can't execute",
cstrerror(tp->u2.errnov));
}
break;
}
/* set $_ to programme's full path */
/* setstr() can't fail here */
setstr(typeset("_", LOCAL|EXPORT, 0, INTEGER, 0),
tp->val.s, KSH_RETURN_ERROR);
if (flags&XEXEC) {
j_exit();
if (!(flags&XBGND)
#ifndef MKSH_UNEMPLOYED
|| Flag(FMONITOR)
#endif
) {
setexecsig(&sigtraps[SIGINT], SS_RESTORE_ORIG);
setexecsig(&sigtraps[SIGQUIT], SS_RESTORE_ORIG);
}
}
/* to fork we set up a TEXEC node and call execute */
texec.type = TEXEC;
/* for tprint */
texec.left = t;
texec.str = tp->val.s;
texec.args = ap;
rv = exchild(&texec, flags, xerrok, -1);
break;
}
Leave:
if (flags & XEXEC) {
exstat = rv & 0xFF;
unwind(LLEAVE);
}
return (rv);
}
/*
* execute command tree
*/
int
execute(struct op * volatile t,
/* if XEXEC don't fork */
volatile int flags,
volatile int * volatile xerrok)
{
int i;
volatile int rv = 0, dummy = 0;
int pv[2];
const char ** volatile ap = NULL;
char ** volatile up;
const char *s, *ccp;
struct ioword **iowp;
struct tbl *tp = NULL;
char *cp;
if (t == NULL)
return (0);
/* Caller doesn't care if XERROK should propagate. */
if (xerrok == NULL)
xerrok = &dummy;
if ((flags&XFORK) && !(flags&XEXEC) && t->type != TPIPE)
/* run in sub-process */
return (exchild(t, flags & ~XTIME, xerrok, -1));
newenv(E_EXEC);
if (trap)
runtraps(0);
/* we want to run an executable, do some variance checks */
if (t->type == TCOM) {
/* check if this is 'var=<<EOF' */
if (
/* we have zero arguments, i.e. no programme to run */
t->args[0] == NULL &&
/* we have exactly one variable assignment */
t->vars[0] != NULL && t->vars[1] == NULL &&
/* we have exactly one I/O redirection */
t->ioact != NULL && t->ioact[0] != NULL &&
t->ioact[1] == NULL &&
/* of type "here document" (or "here string") */
(t->ioact[0]->flag & IOTYPE) == IOHERE &&
/* the variable assignment begins with a valid varname */
(ccp = skip_wdvarname(t->vars[0], true)) != t->vars[0] &&
/* and has no right-hand side (i.e. "varname=") */
ccp[0] == CHAR && ccp[1] == '=' && ccp[2] == EOS &&
/* plus we can have a here document content */
herein(t->ioact[0], &cp) == 0 && cp && *cp) {
char *sp = cp, *dp;
size_t n = ccp - t->vars[0] + 2, z;
/* drop redirection (will be garbage collected) */
t->ioact = NULL;
/* set variable to its expanded value */
z = strlen(cp) + 1;
if (notoktomul(z, 2) || notoktoadd(z * 2, n))
internal_errorf(Toomem, (unsigned long)-1);
dp = alloc(z * 2 + n, ATEMP);
memcpy(dp, t->vars[0], n);
t->vars[0] = dp;
dp += n;
while (*sp) {
*dp++ = QCHAR;
*dp++ = *sp++;
}
*dp = EOS;
/* free the expanded value */
afree(cp, APERM);
}
/*
* Clear subst_exstat before argument expansion. Used by
* null commands (see comexec() and c_eval()) and by c_set().
*/
subst_exstat = 0;
/* for $LINENO */
current_lineno = t->lineno;
/*
* POSIX says expand command words first, then redirections,
* and assignments last..
*/
up = eval(t->args, t->u.evalflags | DOBLANK | DOGLOB | DOTILDE);
if (flags & XTIME)
/* Allow option parsing (bizarre, but POSIX) */
timex_hook(t, &up);
ap = (const char **)up;
if (Flag(FXTRACE) && ap[0]) {
shf_puts(substitute(str_val(global("PS4")), 0),
shl_out);
for (i = 0; ap[i]; i++)
shf_fprintf(shl_out, "%s%c", ap[i],
ap[i + 1] ? ' ' : '\n');
shf_flush(shl_out);
}
if (ap[0])
tp = findcom(ap[0], FC_BI|FC_FUNC);
}
flags &= ~XTIME;
if (t->ioact != NULL || t->type == TPIPE || t->type == TCOPROC) {
e->savefd = alloc2(NUFILE, sizeof(short), ATEMP);
/* initialise to not redirected */
memset(e->savefd, 0, NUFILE * sizeof(short));
}
/* mark for replacement later (unless TPIPE) */
vp_pipest->flag |= INT_L;
/* do redirection, to be restored in quitenv() */
if (t->ioact != NULL)
for (iowp = t->ioact; *iowp != NULL; iowp++) {
if (iosetup(*iowp, tp) < 0) {
exstat = rv = 1;
/*
* Redirection failures for special commands
* cause (non-interactive) shell to exit.
*/
if (tp && tp->type == CSHELL &&
(tp->flag & SPEC_BI))
errorfz();
/* Deal with FERREXIT, quitenv(), etc. */
goto Break;
}
}
switch (t->type) {
case TCOM:
rv = comexec(t, tp, (const char **)ap, flags, xerrok);
break;
case TPAREN:
rv = execute(t->left, flags | XFORK, xerrok);
break;
case TPIPE:
flags |= XFORK;
flags &= ~XEXEC;
e->savefd[0] = savefd(0);
e->savefd[1] = savefd(1);
while (t->type == TPIPE) {
openpipe(pv);
/* stdout of curr */
ksh_dup2(pv[1], 1, false);
/**
* Let exchild() close pv[0] in child
* (if this isn't done, commands like
* (: ; cat /etc/termcap) | sleep 1
* will hang forever).
*/
exchild(t->left, flags | XPIPEO | XCCLOSE,
NULL, pv[0]);
/* stdin of next */
ksh_dup2(pv[0], 0, false);
closepipe(pv);
flags |= XPIPEI;
t = t->right;
}
/* stdout of last */
restfd(1, e->savefd[1]);
/* no need to re-restore this */
e->savefd[1] = 0;
/* Let exchild() close 0 in parent, after fork, before wait */
i = exchild(t, flags | XPCLOSE | XPIPEST, xerrok, 0);
if (!(flags&XBGND) && !(flags&XXCOM))
rv = i;
break;
case TLIST:
while (t->type == TLIST) {
execute(t->left, flags & XERROK, NULL);
t = t->right;
}
rv = execute(t, flags & XERROK, xerrok);
break;
case TCOPROC: {
#ifndef MKSH_NOPROSPECTOFWORK
sigset_t omask;
/*
* Block sigchild as we are using things changed in the
* signal handler
*/
sigprocmask(SIG_BLOCK, &sm_sigchld, &omask);
e->type = E_ERRH;
if ((i = kshsetjmp(e->jbuf))) {
sigprocmask(SIG_SETMASK, &omask, NULL);
quitenv(NULL);
unwind(i);
/* NOTREACHED */
}
#endif
/* Already have a (live) co-process? */
if (coproc.job && coproc.write >= 0)
errorf("coprocess already exists");
/* Can we re-use the existing co-process pipe? */
coproc_cleanup(true);
/* do this before opening pipes, in case these fail */
e->savefd[0] = savefd(0);
e->savefd[1] = savefd(1);
openpipe(pv);
if (pv[0] != 0) {
ksh_dup2(pv[0], 0, false);
close(pv[0]);
}
coproc.write = pv[1];
coproc.job = NULL;
if (coproc.readw >= 0)
ksh_dup2(coproc.readw, 1, false);
else {
openpipe(pv);
coproc.read = pv[0];
ksh_dup2(pv[1], 1, false);
/* closed before first read */
coproc.readw = pv[1];
coproc.njobs = 0;
/* create new coprocess id */
++coproc.id;
}
#ifndef MKSH_NOPROSPECTOFWORK
sigprocmask(SIG_SETMASK, &omask, NULL);
/* no more need for error handler */
e->type = E_EXEC;
#endif
/*
* exchild() closes coproc.* in child after fork,
* will also increment coproc.njobs when the
* job is actually created.
*/
flags &= ~XEXEC;
exchild(t->left, flags | XBGND | XFORK | XCOPROC | XCCLOSE,
NULL, coproc.readw);
break;
}
case TASYNC:
/*
* XXX non-optimal, I think - "(foo &)", forks for (),
* forks again for async... parent should optimise
* this to "foo &"...
*/
rv = execute(t->left, (flags&~XEXEC)|XBGND|XFORK, xerrok);
break;
case TOR:
case TAND:
rv = execute(t->left, XERROK, xerrok);
if ((rv == 0) == (t->type == TAND))
rv = execute(t->right, XERROK, xerrok);
flags |= XERROK;
if (xerrok)
*xerrok = 1;
break;
case TBANG:
rv = !execute(t->right, XERROK, xerrok);
flags |= XERROK;
if (xerrok)
*xerrok = 1;
break;
case TDBRACKET: {
Test_env te;
te.flags = TEF_DBRACKET;
te.pos.wp = t->args;
te.isa = dbteste_isa;
te.getopnd = dbteste_getopnd;
te.eval = test_eval;
te.error = dbteste_error;
rv = test_parse(&te);
break;
}
case TFOR:
case TSELECT: {
volatile bool is_first = true;
ap = (t->vars == NULL) ? e->loc->argv + 1 :
(const char **)eval((const char **)t->vars,
DOBLANK | DOGLOB | DOTILDE);
e->type = E_LOOP;
while ((i = kshsetjmp(e->jbuf))) {
if ((e->flags&EF_BRKCONT_PASS) ||
(i != LBREAK && i != LCONTIN)) {
quitenv(NULL);
unwind(i);
} else if (i == LBREAK) {
rv = 0;
goto Break;
}
}
/* in case of a continue */
rv = 0;
if (t->type == TFOR) {
while (*ap != NULL) {
setstr(global(t->str), *ap++, KSH_UNWIND_ERROR);
rv = execute(t->left, flags & XERROK, xerrok);
}
} else {
/* TSELECT */
for (;;) {
if (!(ccp = do_selectargs(ap, is_first))) {
rv = 1;
break;
}
is_first = false;
setstr(global(t->str), ccp, KSH_UNWIND_ERROR);
execute(t->left, flags & XERROK, xerrok);
}
}
break;
}
case TWHILE:
case TUNTIL:
e->type = E_LOOP;
while ((i = kshsetjmp(e->jbuf))) {
if ((e->flags&EF_BRKCONT_PASS) ||
(i != LBREAK && i != LCONTIN)) {
quitenv(NULL);
unwind(i);
} else if (i == LBREAK) {
rv = 0;
goto Break;
}
}
/* in case of a continue */
rv = 0;
while ((execute(t->left, XERROK, NULL) == 0) ==
(t->type == TWHILE))
rv = execute(t->right, flags & XERROK, xerrok);
break;
case TIF:
case TELIF:
if (t->right == NULL)
/* should be error */
break;
rv = execute(t->left, XERROK, NULL) == 0 ?
execute(t->right->left, flags & XERROK, xerrok) :
execute(t->right->right, flags & XERROK, xerrok);
break;
case TCASE:
i = 0;
ccp = evalstr(t->str, DOTILDE);
for (t = t->left; t != NULL && t->type == TPAT; t = t->right) {
for (ap = (const char **)t->vars; *ap; ap++) {
if (i || ((s = evalstr(*ap, DOTILDE|DOPAT)) &&
gmatchx(ccp, s, false))) {
rv = execute(t->left, flags & XERROK,
xerrok);
i = 0;
switch (t->u.charflag) {
case '&':
i = 1;
/* FALLTHROUGH */
case '|':
goto TCASE_next;
}
goto TCASE_out;
}
}
i = 0;
TCASE_next:
/* empty */;
}
TCASE_out:
break;
case TBRACE:
rv = execute(t->left, flags & XERROK, xerrok);
break;
case TFUNCT:
rv = define(t->str, t);
break;
case TTIME:
/*
* Clear XEXEC so nested execute() call doesn't exit
* (allows "ls -l | time grep foo").
*/
rv = timex(t, flags & ~XEXEC, xerrok);
break;
case TEXEC:
/* an eval'd TCOM */
s = t->args[0];
up = makenv();
restoresigs();
cleanup_proc_env();
{
union mksh_ccphack cargs;
cargs.ro = t->args;
execve(t->str, cargs.rw, up);
rv = errno;
}
if (rv == ENOEXEC)
scriptexec(t, (const char **)up);
else
errorf("%s: %s", s, cstrerror(rv));
}
Break:
exstat = rv & 0xFF;
if (vp_pipest->flag & INT_L) {
unset(vp_pipest, 1);
vp_pipest->flag = DEFINED | ISSET | INTEGER | RDONLY |
ARRAY | INT_U;
vp_pipest->val.i = rv;
}
/* restores IO */
quitenv(NULL);
if ((flags&XEXEC))
/* exit child */
unwind(LEXIT);
if (rv != 0 && !(flags & XERROK) &&
(xerrok == NULL || !*xerrok)) {
if (Flag(FERREXIT) & 0x80) {
/* inside eval */
Flag(FERREXIT) = 0;
} else {
trapsig(ksh_SIGERR);
if (Flag(FERREXIT))
unwind(LERROR);
}
}
return (rv);
}
/*
* set up redirection, saving old fds in e->savefd
*/
static int
iosetup(struct ioword *iop, struct tbl *tp)
{
int u = -1;
char *cp = iop->name;
int iotype = iop->flag & IOTYPE;
bool do_open = true, do_close = false;
int flags = 0;
struct ioword iotmp;
struct stat statb;
if (iotype != IOHERE)
cp = evalonestr(cp, DOTILDE|(Flag(FTALKING_I) ? DOGLOB : 0));
/* Used for tracing and error messages to print expanded cp */
iotmp = *iop;
iotmp.name = (iotype == IOHERE) ? NULL : cp;
iotmp.flag |= IONAMEXP;
if (Flag(FXTRACE))
shellf("%s%s\n",
substitute(str_val(global("PS4")), 0),
snptreef(NULL, 32, "%R", &iotmp));
switch (iotype) {
case IOREAD:
flags = O_RDONLY;
break;
case IOCAT:
flags = O_WRONLY | O_APPEND | O_CREAT;
break;
case IOWRITE:
flags = O_WRONLY | O_CREAT | O_TRUNC;
/*
* The stat() is here to allow redirections to
* things like /dev/null without error.
*/
if (Flag(FNOCLOBBER) && !(iop->flag & IOCLOB) &&
(stat(cp, &statb) < 0 || S_ISREG(statb.st_mode)))
flags |= O_EXCL;
break;
case IORDWR:
flags = O_RDWR | O_CREAT;
break;
case IOHERE:
do_open = false;
/* herein() returns -2 if error has been printed */
u = herein(iop, NULL);
/* cp may have wrong name */
break;
case IODUP: {
const char *emsg;
do_open = false;
if (*cp == '-' && !cp[1]) {
/* prevent error return below */
u = 1009;
do_close = true;
} else if ((u = check_fd(cp,
X_OK | ((iop->flag & IORDUP) ? R_OK : W_OK),
&emsg)) < 0) {
warningf(true, "%s: %s",
snptreef(NULL, 32, "%R", &iotmp), emsg);
return (-1);
}
if (u == iop->unit)
/* "dup from" == "dup to" */
return (0);
break;
}
}
if (do_open) {
if (Flag(FRESTRICTED) && (flags & O_CREAT)) {
warningf(true, "%s: %s", cp, "restricted");
return (-1);
}
u = open(cp, flags, 0666);
}
if (u < 0) {
/* herein() may already have printed message */
if (u == -1) {
u = errno;
warningf(true, "can't %s %s: %s",
iotype == IODUP ? "dup" :
(iotype == IOREAD || iotype == IOHERE) ?
"open" : "create", cp, cstrerror(u));
}
return (-1);
}
/* Do not save if it has already been redirected (i.e. "cat >x >y"). */
if (e->savefd[iop->unit] == 0) {
/* If these are the same, it means unit was previously closed */
if (u == iop->unit)
e->savefd[iop->unit] = -1;
else
/*
* c_exec() assumes e->savefd[fd] set for any
* redirections. Ask savefd() not to close iop->unit;
* this allows error messages to be seen if iop->unit
* is 2; also means we can't lose the fd (eg, both
* dup2 below and dup2 in restfd() failing).
*/
e->savefd[iop->unit] = savefd(iop->unit);
}
if (do_close)
close(iop->unit);
else if (u != iop->unit) {
if (ksh_dup2(u, iop->unit, true) < 0) {
int eno;
eno = errno;
warningf(true, "%s %s %s",
"can't finish (dup) redirection",
snptreef(NULL, 32, "%R", &iotmp),
cstrerror(eno));
if (iotype != IODUP)
close(u);
return (-1);
}
if (iotype != IODUP)
close(u);
/*
* Touching any co-process fd in an empty exec
* causes the shell to close its copies
*/
else if (tp && tp->type == CSHELL && tp->val.f == c_exec) {
if (iop->flag & IORDUP)
/* possible exec <&p */
coproc_read_close(u);
else
/* possible exec >&p */
coproc_write_close(u);
}
}
if (u == 2)
/* Clear any write errors */
shf_reopen(2, SHF_WR, shl_out);
return (0);
}
/*
create a directory listing in a StringQueue
flags can be IGNORE_SYMLINKS|IGNORE_HIDDEN|NO_SLASHES|NO_DIRS
*/
StringQueue *listdir(char *dirname, int flags) {
StringQueue *l;
StringList *sl;
DIR *dir;
struct dirent *entry;
char fullpath[MAX_PATHLEN], *path, errbuf[MAX_LINE];
struct stat statbuf;
int max, n;
if (dirname == NULL || !*dirname)
return NULL;
if ((dir = opendir(dirname)) == NULL) {
log_err("listdir(): opendir(%s) failed %s", dirname, cstrerror(errno, errbuf, MAX_LINE));
return NULL;
}
if ((l = new_StringQueue()) == NULL) {
closedir(dir);
return NULL;
}
cstrcpy(fullpath, dirname, MAX_PATHLEN);
max = strlen(fullpath);
path = fullpath + max;
*path = '/';
path++;
*path = 0;
max = MAX_PATHLEN - max - 1;
while((entry = readdir(dir)) != NULL) {
if ((flags & IGNORE_HIDDEN) && entry->d_name[0] == '.') /* skip hidden files */
continue;
cstrcpy(path, entry->d_name, max);
if (lstat(fullpath, &statbuf) < 0) {
log_err("listdir(): lstat(%s) failed: %s", fullpath, cstrerror(errno, errbuf, MAX_LINE));
continue;
}
switch(statbuf.st_mode & S_IFMT) {
case S_IFREG:
break;
case S_IFDIR: /* for directories, append a slash */
if (flags & NO_DIRS) {
*path = 0;
break;
}
if (!(flags & NO_SLASHES)) {
n = strlen(path);
path[n++] = '/';
path[n] = 0;
}
break;
case S_IFLNK:
if (flags & IGNORE_SYMLINKS)
*path = 0;
break;
default: /* no fifo's, sockets, device files, etc. */
*path = 0;
}
if (!*path)
continue;
if ((sl = new_StringList(path)) == NULL) {
log_err("listdir(): out of memory for directory %s", dirname);
break;
}
(void)add_StringQueue(l, sl);
}
closedir(dir);
sort_StringQueue(l, alphasort_StringList);
return l;
}
static int
main_init(int argc, const char *argv[], Source **sp, struct block **lp)
{
int argi, i;
Source *s = NULL;
struct block *l;
unsigned char restricted_shell, errexit, utf_flag;
char *cp;
const char *ccp, **wp;
struct tbl *vp;
struct stat s_stdin;
#if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
ssize_t k;
#endif
#if defined(MKSH_EBCDIC) || defined(MKSH_FAUX_EBCDIC)
ebcdic_init();
#endif
set_ifs(TC_IFSWS);
#ifdef __OS2__
os2_init(&argc, &argv);
#endif
/* do things like getpgrp() et al. */
chvt_reinit();
/* make sure argv[] is sane, for weird OSes */
if (!*argv) {
argv = empty_argv;
argc = 1;
}
kshname = argv[0];
/* initialise permanent Area */
ainit(&aperm);
/* max. name length: -2147483648 = 11 (+ NUL) */
vtemp = alloc(offsetof(struct tbl, name[0]) + 12, APERM);
/* set up base environment */
env.type = E_NONE;
ainit(&env.area);
/* set up global l->vars and l->funs */
newblock();
/* Do this first so output routines (eg, errorf, shellf) can work */
initio();
/* determine the basename (without '-' or path) of the executable */
ccp = kshname;
goto begin_parsing_kshname;
while ((i = ccp[argi++])) {
if (mksh_cdirsep(i)) {
ccp += argi;
begin_parsing_kshname:
argi = 0;
if (*ccp == '-')
++ccp;
}
}
if (!*ccp)
ccp = empty_argv[0];
/*
* Turn on nohup by default. (AT&T ksh does not have a nohup
* option - it always sends the hup).
*/
Flag(FNOHUP) = 1;
/*
* Turn on brace expansion by default. AT&T kshs that have
* alternation always have it on.
*/
Flag(FBRACEEXPAND) = 1;
/*
* Turn on "set -x" inheritance by default.
*/
Flag(FXTRACEREC) = 1;
/* define built-in commands and see if we were called as one */
ktinit(APERM, &builtins,
/* currently up to 54 builtins: 75% of 128 = 2^7 */
7);
for (i = 0; mkshbuiltins[i].name != NULL; i++)
if (!strcmp(ccp, builtin(mkshbuiltins[i].name,
mkshbuiltins[i].func)))
Flag(FAS_BUILTIN) = 1;
if (!Flag(FAS_BUILTIN)) {
/* check for -T option early */
argi = parse_args(argv, OF_FIRSTTIME, NULL);
if (argi < 0)
return (1);
#if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED)
/* are we called as -sh or /bin/sh or so? */
if (!strcmp(ccp, "sh" MKSH_EXE_EXT)) {
/* either also turns off braceexpand */
#ifdef MKSH_BINSHPOSIX
/* enable better POSIX conformance */
change_flag(FPOSIX, OF_FIRSTTIME, true);
#endif
#ifdef MKSH_BINSHREDUCED
/* enable kludge/compat mode */
change_flag(FSH, OF_FIRSTTIME, true);
#endif
}
#endif
}
initvar();
inittraps();
coproc_init();
/* set up variable and command dictionaries */
ktinit(APERM, &taliases, 0);
ktinit(APERM, &aliases, 0);
#ifndef MKSH_NOPWNAM
ktinit(APERM, &homedirs, 0);
#endif
/* define shell keywords */
initkeywords();
init_histvec();
/* initialise tty size before importing environment */
change_winsz();
#ifdef _PATH_DEFPATH
def_path = _PATH_DEFPATH;
#else
#ifdef _CS_PATH
if ((k = confstr(_CS_PATH, NULL, 0)) > 0 &&
confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1)
def_path = cp;
else
#endif
/*
* this is uniform across all OSes unless it
* breaks somewhere hard; don't try to optimise,
* e.g. add stuff for Interix or remove /usr
* for HURD, because e.g. Debian GNU/HURD is
* "keeping a regular /usr"; this is supposed
* to be a sane 'basic' default PATH
*/
def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS
MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS
MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS
MKSH_UNIXROOT "/usr/sbin";
#endif
/*
* Set PATH to def_path (will set the path global variable).
* (import of environment below will probably change this setting).
*/
vp = global(TPATH);
/* setstr can't fail here */
setstr(vp, def_path, KSH_RETURN_ERROR);
#ifndef MKSH_NO_CMDLINE_EDITING
/*
* Set edit mode to emacs by default, may be overridden
* by the environment or the user. Also, we want tab completion
* on in vi by default.
*/
change_flag(FEMACS, OF_SPECIAL, true);
#if !MKSH_S_NOVI
Flag(FVITABCOMPLETE) = 1;
#endif
#endif
/* import environment */
init_environ();
/* override default PATH regardless of environment */
#ifdef MKSH_DEFPATH_OVERRIDE
vp = global(TPATH);
setstr(vp, MKSH_DEFPATH_OVERRIDE, KSH_RETURN_ERROR);
#endif
/* for security */
typeset(TinitIFS, 0, 0, 0, 0);
/* assign default shell variable values */
typeset("PATHSEP=" MKSH_PATHSEPS, 0, 0, 0, 0);
substitute(initsubs, 0);
/* Figure out the current working directory and set $PWD */
vp = global(TPWD);
cp = str_val(vp);
/* Try to use existing $PWD if it is valid */
set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp,
Tdot, true)) ? cp : NULL);
if (current_wd[0])
simplify_path(current_wd);
/* Only set pwd if we know where we are or if it had a bogus value */
if (current_wd[0] || *cp)
/* setstr can't fail here */
setstr(vp, current_wd, KSH_RETURN_ERROR);
for (wp = initcoms; *wp != NULL; wp++) {
c_builtin(wp);
while (*wp != NULL)
wp++;
}
setint_n(global("OPTIND"), 1, 10);
kshuid = getuid();
kshgid = getgid();
kshegid = getegid();
safe_prompt = ksheuid ? "$ " : "# ";
vp = global("PS1");
/* Set PS1 if unset or we are root and prompt doesn't contain a # */
if (!(vp->flag & ISSET) ||
(!ksheuid && !strchr(str_val(vp), '#')))
/* setstr can't fail here */
setstr(vp, safe_prompt, KSH_RETURN_ERROR);
setint_n((vp = global("BASHPID")), 0, 10);
vp->flag |= INT_U;
setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10);
vp->flag |= INT_U;
setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10);
vp->flag |= INT_U;
setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10);
vp->flag |= INT_U;
setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10);
vp->flag |= INT_U;
setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10);
vp->flag |= INT_U;
setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10);
vp->flag |= INT_U;
setint_n((vp = global("RANDOM")), rndsetup(), 10);
vp->flag |= INT_U;
setint_n((vp_pipest = global("PIPESTATUS")), 0, 10);
/* Set this before parsing arguments */
Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0;
/* this to note if monitor is set on command line (see below) */
#ifndef MKSH_UNEMPLOYED
Flag(FMONITOR) = 127;
#endif
/* this to note if utf-8 mode is set on command line (see below) */
UTFMODE = 2;
if (!Flag(FAS_BUILTIN)) {
argi = parse_args(argv, OF_CMDLINE, NULL);
if (argi < 0)
return (1);
}
/* process this later only, default to off (hysterical raisins) */
utf_flag = UTFMODE;
UTFMODE = 0;
if (Flag(FAS_BUILTIN)) {
/* auto-detect from environment variables, always */
utf_flag = 3;
} else if (Flag(FCOMMAND)) {
s = pushs(SSTRINGCMDLINE, ATEMP);
if (!(s->start = s->str = argv[argi++]))
errorf(Tf_optfoo, "", "", 'c', Treq_arg);
while (*s->str) {
if (ctype(*s->str, C_QUOTE))
break;
s->str++;
}
if (!*s->str)
s->flags |= SF_MAYEXEC;
s->str = s->start;
#ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
/* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */
if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--"))
++argi;
#endif
if (argv[argi])
kshname = argv[argi++];
} else if (argi < argc && !Flag(FSTDIN)) {
s = pushs(SFILE, ATEMP);
#ifdef __OS2__
/*
* A bug in OS/2 extproc (like shebang) handling makes
* it not pass the full pathname of a script, so we need
* to search for it. This changes the behaviour of a
* simple "mksh foo", but can't be helped.
*/
s->file = argv[argi++];
if (search_access(s->file, X_OK) != 0)
s->file = search_path(s->file, path, X_OK, NULL);
if (!s->file || !*s->file)
s->file = argv[argi - 1];
#else
s->file = argv[argi++];
#endif
s->u.shf = shf_open(s->file, O_RDONLY, 0,
SHF_MAPHI | SHF_CLEXEC);
if (s->u.shf == NULL) {
shl_stdout_ok = false;
warningf(true, Tf_sD_s, s->file, cstrerror(errno));
/* mandated by SUSv4 */
exstat = 127;
unwind(LERROR);
}
kshname = s->file;
} else {
Flag(FSTDIN) = 1;
s = pushs(SSTDIN, ATEMP);
s->file = "<stdin>";
s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
NULL);
if (isatty(0) && isatty(2)) {
Flag(FTALKING) = Flag(FTALKING_I) = 1;
/* The following only if isatty(0) */
s->flags |= SF_TTY;
s->u.shf->flags |= SHF_INTERRUPT;
s->file = NULL;
}
}
/* this bizarreness is mandated by POSIX */
if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) &&
Flag(FTALKING))
reset_nonblock(0);
/* initialise job control */
j_init();
/* do this after j_init() which calls tty_init_state() */
if (Flag(FTALKING)) {
if (utf_flag == 2) {
#ifndef MKSH_ASSUME_UTF8
/* auto-detect from locale or environment */
utf_flag = 4;
#else /* this may not be an #elif */
#if MKSH_ASSUME_UTF8
utf_flag = 1;
#else
/* always disable UTF-8 (for interactive) */
utf_flag = 0;
#endif
#endif
}
#ifndef MKSH_NO_CMDLINE_EDITING
x_init();
#endif
}
#ifdef SIGWINCH
sigtraps[SIGWINCH].flags |= TF_SHELL_USES;
setsig(&sigtraps[SIGWINCH], x_sigwinch,
SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
#endif
l = e->loc;
if (Flag(FAS_BUILTIN)) {
l->argc = argc;
l->argv = argv;
l->argv[0] = ccp;
} else {
l->argc = argc - argi;
/*
* allocate a new array because otherwise, when we modify
* it in-place, ps(1) output changes; the meaning of argc
* here is slightly different as it excludes kshname, and
* we add a trailing NULL sentinel as well
*/
l->argv = alloc2(l->argc + 2, sizeof(void *), APERM);
l->argv[0] = kshname;
memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *));
l->argv[l->argc + 1] = NULL;
getopts_reset(1);
}
/* divine the initial state of the utf8-mode Flag */
ccp = null;
switch (utf_flag) {
/* auto-detect from locale or environment */
case 4:
#if HAVE_SETLOCALE_CTYPE
ccp = setlocale(LC_CTYPE, "");
#if HAVE_LANGINFO_CODESET
if (!isuc(ccp))
ccp = nl_langinfo(CODESET);
#endif
if (!isuc(ccp))
ccp = null;
#endif
/* FALLTHROUGH */
/* auto-detect from environment */
case 3:
/* these were imported from environ earlier */
if (ccp == null)
ccp = str_val(global("LC_ALL"));
if (ccp == null)
ccp = str_val(global("LC_CTYPE"));
if (ccp == null)
ccp = str_val(global("LANG"));
UTFMODE = isuc(ccp);
break;
/* not set on command line, not FTALKING */
case 2:
/* unknown values */
default:
utf_flag = 0;
/* FALLTHROUGH */
/* known values */
case 1:
case 0:
UTFMODE = utf_flag;
break;
}
/* Disable during .profile/ENV reading */
restricted_shell = Flag(FRESTRICTED);
Flag(FRESTRICTED) = 0;
errexit = Flag(FERREXIT);
Flag(FERREXIT) = 0;
/*
* Do this before profile/$ENV so that if it causes problems in them,
* user will know why things broke.
*/
if (!current_wd[0] && Flag(FTALKING))
warningf(false, "can't determine current directory");
if (Flag(FLOGIN))
include(MKSH_SYSTEM_PROFILE, 0, NULL, true);
if (!Flag(FPRIVILEGED)) {
if (Flag(FLOGIN))
include(substitute("$HOME/.profile", 0), 0, NULL, true);
if (Flag(FTALKING)) {
cp = substitute("${ENV:-" MKSHRC_PATH "}", DOTILDE);
if (cp[0] != '\0')
include(cp, 0, NULL, true);
}
} else {
include(MKSH_SUID_PROFILE, 0, NULL, true);
/* turn off -p if not set explicitly */
if (Flag(FPRIVILEGED) != 1)
change_flag(FPRIVILEGED, OF_INTERNAL, false);
}
if (restricted_shell) {
c_builtin(restr_com);
/* After typeset command... */
Flag(FRESTRICTED) = 1;
}
Flag(FERREXIT) = errexit;
if (Flag(FTALKING) && s)
hist_init(s);
else
/* set after ENV */
Flag(FTRACKALL) = 1;
alarm_init();
*sp = s;
*lp = l;
return (0);
}
int
c_cd(const char **wp)
{
int optc, rv, phys_path;
bool physical = tobool(Flag(FPHYSICAL));
/* was a node from cdpath added in? */
int cdnode;
/* show where we went?, error for $PWD */
bool printpath = false, eflag = false;
struct tbl *pwd_s, *oldpwd_s;
XString xs;
char *dir, *allocd = NULL, *tryp, *pwd, *cdpath;
while ((optc = ksh_getopt(wp, &builtin_opt, "eLP")) != -1)
switch (optc) {
case 'e':
eflag = true;
break;
case 'L':
physical = false;
break;
case 'P':
physical = true;
break;
case '?':
return (2);
}
wp += builtin_opt.optind;
if (Flag(FRESTRICTED)) {
bi_errorf("restricted shell - can't cd");
return (2);
}
pwd_s = global("PWD");
oldpwd_s = global("OLDPWD");
if (!wp[0]) {
/* No arguments - go home */
if ((dir = str_val(global("HOME"))) == null) {
bi_errorf("no home directory (HOME not set)");
return (2);
}
} else if (!wp[1]) {
/* One argument: - or dir */
strdupx(allocd, wp[0], ATEMP);
if (ksh_isdash((dir = allocd))) {
afree(allocd, ATEMP);
allocd = NULL;
dir = str_val(oldpwd_s);
if (dir == null) {
bi_errorf("no OLDPWD");
return (2);
}
printpath = true;
}
} else if (!wp[2]) {
/* Two arguments - substitute arg1 in PWD for arg2 */
size_t ilen, olen, nlen, elen;
char *cp;
if (!current_wd[0]) {
bi_errorf("can't determine current directory");
return (2);
}
/*
* substitute arg1 for arg2 in current path.
* if the first substitution fails because the cd fails
* we could try to find another substitution. For now
* we don't
*/
if ((cp = strstr(current_wd, wp[0])) == NULL) {
bi_errorf("bad substitution");
return (2);
}
/*-
* ilen = part of current_wd before wp[0]
* elen = part of current_wd after wp[0]
* because current_wd and wp[1] need to be in memory at the
* same time beforehand the addition can stay unchecked
*/
ilen = cp - current_wd;
olen = strlen(wp[0]);
nlen = strlen(wp[1]);
elen = strlen(current_wd + ilen + olen) + 1;
dir = allocd = alloc(ilen + nlen + elen, ATEMP);
memcpy(dir, current_wd, ilen);
memcpy(dir + ilen, wp[1], nlen);
memcpy(dir + ilen + nlen, current_wd + ilen + olen, elen);
printpath = true;
} else {
bi_errorf("too many arguments");
return (2);
}
#ifdef MKSH__NO_PATH_MAX
/* only a first guess; make_path will enlarge xs if necessary */
XinitN(xs, 1024, ATEMP);
#else
XinitN(xs, PATH_MAX, ATEMP);
#endif
cdpath = str_val(global("CDPATH"));
do {
cdnode = make_path(current_wd, dir, &cdpath, &xs, &phys_path);
if (physical)
rv = chdir(tryp = Xstring(xs, xp) + phys_path);
else {
simplify_path(Xstring(xs, xp));
rv = chdir(tryp = Xstring(xs, xp));
}
} while (rv < 0 && cdpath != NULL);
if (rv < 0) {
if (cdnode)
bi_errorf("%s: %s", dir, "bad directory");
else
bi_errorf("%s: %s", tryp, cstrerror(errno));
afree(allocd, ATEMP);
Xfree(xs, xp);
return (2);
}
rv = 0;
/* allocd (above) => dir, which is no longer used */
afree(allocd, ATEMP);
allocd = NULL;
/* Clear out tracked aliases with relative paths */
flushcom(false);
/*
* Set OLDPWD (note: unsetting OLDPWD does not disable this
* setting in AT&T ksh)
*/
if (current_wd[0])
/* Ignore failure (happens if readonly or integer) */
setstr(oldpwd_s, current_wd, KSH_RETURN_ERROR);
if (!mksh_abspath(Xstring(xs, xp))) {
pwd = NULL;
} else if (!physical) {
goto norealpath_PWD;
} else if ((pwd = allocd = do_realpath(Xstring(xs, xp))) == NULL) {
if (eflag)
rv = 1;
norealpath_PWD:
pwd = Xstring(xs, xp);
}
/* Set PWD */
if (pwd) {
char *ptmp = pwd;
set_current_wd(ptmp);
/* Ignore failure (happens if readonly or integer) */
setstr(pwd_s, ptmp, KSH_RETURN_ERROR);
} else {
set_current_wd(null);
pwd = Xstring(xs, xp);
/* XXX unset $PWD? */
if (eflag)
rv = 1;
}
if (printpath || cdnode)
shprintf("%s\n", pwd);
afree(allocd, ATEMP);
Xfree(xs, xp);
return (rv);
}
static void
scriptexec(struct op *tp, const char **ap)
{
const char *sh;
#ifndef MKSH_SMALL
int fd;
unsigned char buf[68];
#endif
union mksh_ccphack args, cap;
sh = str_val(global("EXECSHELL"));
if (sh && *sh)
sh = search_path(sh, path, X_OK, NULL);
if (!sh || !*sh)
sh = MKSH_DEFAULT_EXECSHELL;
*tp->args-- = tp->str;
#ifndef MKSH_SMALL
if ((fd = binopen2(tp->str, O_RDONLY)) >= 0) {
unsigned char *cp;
unsigned short m;
ssize_t n;
/* read first couple of octets from file */
n = read(fd, buf, sizeof(buf) - 1);
close(fd);
/* read error or short read? */
if (n < 5)
goto nomagic;
/* terminate buffer */
buf[n] = '\0';
/* skip UTF-8 Byte Order Mark, if present */
cp = buf + (n = ((buf[0] == 0xEF) && (buf[1] == 0xBB) &&
(buf[2] == 0xBF)) ? 3 : 0);
/* scan for newline or NUL (end of buffer) */
while (*cp && *cp != '\n')
++cp;
/* if the shebang line is longer than MAXINTERP, bail out */
if (!*cp)
goto noshebang;
/* replace newline by NUL */
*cp = '\0';
/* restore begin of shebang position (buf+0 or buf+3) */
cp = buf + n;
/* bail out if no shebang magic found */
if (cp[0] == '#' && cp[1] == '!')
cp += 2;
#ifdef __OS2__
else if (!strncmp(cp, Textproc, 7) &&
(cp[7] == ' ' || cp[7] == '\t'))
cp += 8;
#endif
else
goto noshebang;
/* skip whitespace before shell name */
while (*cp == ' ' || *cp == '\t')
++cp;
/* just whitespace on the line? */
if (*cp == '\0')
goto noshebang;
/* no, we actually found an interpreter name */
sh = (char *)cp;
/* look for end of shell/interpreter name */
while (*cp != ' ' && *cp != '\t' && *cp != '\0')
++cp;
/* any arguments? */
if (*cp) {
*cp++ = '\0';
/* skip spaces before arguments */
while (*cp == ' ' || *cp == '\t')
++cp;
/* pass it all in ONE argument (historic reasons) */
if (*cp)
*tp->args-- = (char *)cp;
}
goto nomagic;
noshebang:
m = buf[0] << 8 | buf[1];
if (m == 0x7F45 && buf[2] == 'L' && buf[3] == 'F')
errorf("%s: not executable: %d-bit ELF file", tp->str,
32 * buf[4]);
if ((m == /* OMAGIC */ 0407) ||
(m == /* NMAGIC */ 0410) ||
(m == /* ZMAGIC */ 0413) ||
(m == /* QMAGIC */ 0314) ||
(m == /* ECOFF_I386 */ 0x4C01) ||
(m == /* ECOFF_M68K */ 0x0150 || m == 0x5001) ||
(m == /* ECOFF_SH */ 0x0500 || m == 0x0005) ||
(m == /* bzip */ 0x425A) || (m == /* "MZ" */ 0x4D5A) ||
(m == /* "NE" */ 0x4E45) || (m == /* "LX" */ 0x4C58) ||
(m == /* xz */ 0xFD37 && buf[2] == 'z' && buf[3] == 'X' &&
buf[4] == 'Z') || (m == /* 7zip */ 0x377A) ||
(m == /* gzip */ 0x1F8B) || (m == /* .Z */ 0x1F9D))
errorf("%s: not executable: magic %04X", tp->str, m);
nomagic:
;
}
#endif
args.ro = tp->args;
*args.ro = sh;
cap.ro = ap;
execve(args.rw[0], args.rw, cap.rw);
/* report both the programme that was run and the bogus interpreter */
errorf("%s: %s: %s", tp->str, sh, cstrerror(errno));
}
static int
comexec(struct op *t, struct tbl * volatile tp, const char **ap,
volatile int flags, volatile int *xerrok)
{
int i;
volatile int rv = 0;
const char *cp;
const char **lastp;
/* Must be static (XXX but why?) */
static struct op texec;
int type_flags;
bool resetspec;
int fcflags = FC_BI|FC_FUNC|FC_PATH;
struct block *l_expand, *l_assign;
int optc;
const char *exec_argv0 = NULL;
bool exec_clrenv = false;
/* snag the last argument for $_ */
if (Flag(FTALKING) && *(lastp = ap)) {
/*
* XXX not the same as AT&T ksh, which only seems to set $_
* after a newline (but not in functions/dot scripts, but in
* interactive and script) - perhaps save last arg here and
* set it in shell()?.
*/
while (*++lastp)
;
/* setstr() can't fail here */
setstr(typeset("_", LOCAL, 0, INTEGER, 0), *--lastp,
KSH_RETURN_ERROR);
}
/**
* Deal with the shell builtins builtin, exec and command since
* they can be followed by other commands. This must be done before
* we know if we should create a local block which must be done
* before we can do a path search (in case the assignments change
* PATH).
* Odd cases:
* FOO=bar exec >/dev/null FOO is kept but not exported
* FOO=bar exec foobar FOO is exported
* FOO=bar command exec >/dev/null FOO is neither kept nor exported
* FOO=bar command FOO is neither kept nor exported
* PATH=... foobar use new PATH in foobar search
*/
resetspec = false;
while (tp && tp->type == CSHELL) {
/* undo effects of command */
fcflags = FC_BI|FC_FUNC|FC_PATH;
if (tp->val.f == c_builtin) {
if ((cp = *++ap) == NULL ||
(!strcmp(cp, "--") && (cp = *++ap) == NULL)) {
tp = NULL;
break;
}
if ((tp = findcom(cp, FC_BI)) == NULL)
errorf("%s: %s: %s", Tbuiltin, cp, "not a builtin");
if (tp->type == CSHELL && (tp->val.f == c_cat
#ifdef MKSH_PRINTF_BUILTIN
|| tp->val.f == c_printf
#endif
))
break;
continue;
} else if (tp->val.f == c_exec) {
if (ap[1] == NULL)
break;
ksh_getopt_reset(&builtin_opt, GF_ERROR);
while ((optc = ksh_getopt(ap, &builtin_opt, "a:c")) != -1)
switch (optc) {
case 'a':
exec_argv0 = builtin_opt.optarg;
break;
case 'c':
exec_clrenv = true;
/* ensure we can actually do this */
resetspec = true;
break;
default:
rv = 2;
goto Leave;
}
ap += builtin_opt.optind;
flags |= XEXEC;
} else if (tp->val.f == c_command) {
bool saw_p = false;
/*
* Ugly dealing with options in two places (here
* and in c_command(), but such is life)
*/
ksh_getopt_reset(&builtin_opt, 0);
while ((optc = ksh_getopt(ap, &builtin_opt, ":p")) == 'p')
saw_p = true;
if (optc != -1)
/* command -vV or something */
break;
/* don't look for functions */
fcflags = FC_BI|FC_PATH;
if (saw_p) {
if (Flag(FRESTRICTED)) {
warningf(true, "%s: %s",
"command -p", "restricted");
rv = 1;
goto Leave;
}
fcflags |= FC_DEFPATH;
}
ap += builtin_opt.optind;
/*
* POSIX says special builtins lose their status
* if accessed using command.
*/
resetspec = true;
if (!ap[0]) {
/* ensure command with no args exits with 0 */
subst_exstat = 0;
break;
}
} else if (tp->val.f == c_cat) {
/* if we have any flags, do not use the builtin */
if (ap[1] && ap[1][0] == '-' && ap[1][1] != '\0' &&
/* argument, begins with -, is not - or -- */
(ap[1][1] != '-' || ap[1][2] != '\0')) {
struct tbl *ext_cat;
ext_cat = findcom(Tcat, FC_PATH | FC_FUNC);
if (ext_cat && (ext_cat->type != CTALIAS ||
(ext_cat->flag & ISSET)))
tp = ext_cat;
}
break;
#ifdef MKSH_PRINTF_BUILTIN
} else if (tp->val.f == c_printf) {
struct tbl *ext_printf;
ext_printf = findcom(Tprintf, FC_PATH | FC_FUNC);
if (ext_printf && (ext_printf->type != CTALIAS ||
(ext_printf->flag & ISSET)))
tp = ext_printf;
break;
#endif
} else if (tp->val.f == c_trap) {
t->u.evalflags &= ~DOTCOMEXEC;
break;
} else
break;
tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC));
}
if (t->u.evalflags & DOTCOMEXEC)
flags |= XEXEC;
l_expand = e->loc;
if (!resetspec && (!ap[0] || (tp && (tp->flag & KEEPASN))))
type_flags = 0;
else {
/* create new variable/function block */
newblock();
/* ksh functions don't keep assignments, POSIX functions do. */
if (!resetspec && tp && tp->type == CFUNC &&
!(tp->flag & FKSH))
type_flags = EXPORT;
else
type_flags = LOCAL|LOCAL_COPY|EXPORT;
}
l_assign = e->loc;
if (exec_clrenv)
l_assign->flags |= BF_STOPENV;
if (Flag(FEXPORT))
type_flags |= EXPORT;
if (Flag(FXTRACE))
change_xtrace(2, false);
for (i = 0; t->vars[i]; i++) {
/* do NOT lookup in the new var/fn block just created */
e->loc = l_expand;
cp = evalstr(t->vars[i], DOASNTILDE | DOSCALAR);
e->loc = l_assign;
if (Flag(FXTRACE)) {
const char *ccp;
ccp = skip_varname(cp, true);
if (*ccp == '+')
++ccp;
if (*ccp == '=')
++ccp;
shf_write(cp, ccp - cp, shl_xtrace);
print_value_quoted(shl_xtrace, ccp);
shf_putc(' ', shl_xtrace);
}
/* but assign in there as usual */
typeset(cp, type_flags, 0, 0, 0);
}
if (Flag(FXTRACE)) {
change_xtrace(2, false);
if (ap[rv = 0]) {
xtrace_ap_loop:
print_value_quoted(shl_xtrace, ap[rv]);
if (ap[++rv]) {
shf_putc(' ', shl_xtrace);
goto xtrace_ap_loop;
}
}
change_xtrace(1, false);
}
if ((cp = *ap) == NULL) {
rv = subst_exstat;
goto Leave;
} else if (!tp) {
if (Flag(FRESTRICTED) && vstrchr(cp, '/')) {
warningf(true, "%s: %s", cp, "restricted");
rv = 1;
goto Leave;
}
tp = findcom(cp, fcflags);
}
switch (tp->type) {
/* shell built-in */
case CSHELL:
do_call_builtin:
rv = call_builtin(tp, (const char **)ap, null, resetspec);
if (resetspec && tp->val.f == c_shift) {
l_expand->argc = l_assign->argc;
l_expand->argv = l_assign->argv;
}
break;
/* function call */
case CFUNC: {
volatile uint32_t old_inuse;
const char * volatile old_kshname;
volatile uint8_t old_flags[FNFLAGS];
if (!(tp->flag & ISSET)) {
struct tbl *ftp;
if (!tp->u.fpath) {
rv = (tp->u2.errnov == ENOENT) ? 127 : 126;
warningf(true, "%s: %s %s: %s", cp,
"can't find", "function definition file",
cstrerror(tp->u2.errnov));
break;
}
if (include(tp->u.fpath, 0, NULL, false) < 0) {
if (!strcmp(cp, Tcat)) {
no_cat_in_FPATH:
tp = findcom(Tcat, FC_BI);
goto do_call_builtin;
}
#ifdef MKSH_PRINTF_BUILTIN
if (!strcmp(cp, Tprintf)) {
no_printf_in_FPATH:
tp = findcom(Tprintf, FC_BI);
goto do_call_builtin;
}
#endif
warningf(true, "%s: %s %s %s: %s", cp,
"can't open", "function definition file",
tp->u.fpath, cstrerror(errno));
rv = 127;
break;
}
if (!(ftp = findfunc(cp, hash(cp), false)) ||
!(ftp->flag & ISSET)) {
if (!strcmp(cp, Tcat))
goto no_cat_in_FPATH;
#ifdef MKSH_PRINTF_BUILTIN
if (!strcmp(cp, Tprintf))
goto no_printf_in_FPATH;
#endif
warningf(true, "%s: %s %s", cp,
"function not defined by", tp->u.fpath);
rv = 127;
break;
}
tp = ftp;
}
/*
* ksh functions set $0 to function name, POSIX
* functions leave $0 unchanged.
*/
old_kshname = kshname;
if (tp->flag & FKSH)
kshname = ap[0];
else
ap[0] = kshname;
e->loc->argv = ap;
for (i = 0; *ap++ != NULL; i++)
;
e->loc->argc = i - 1;
/*
* ksh-style functions handle getopts sanely,
* Bourne/POSIX functions are insane...
*/
if (tp->flag & FKSH) {
e->loc->flags |= BF_DOGETOPTS;
e->loc->getopts_state = user_opt;
getopts_reset(1);
}
for (type_flags = 0; type_flags < FNFLAGS; ++type_flags)
old_flags[type_flags] = shell_flags[type_flags];
change_xtrace((Flag(FXTRACEREC) ? Flag(FXTRACE) : 0) |
((tp->flag & TRACE) ? 1 : 0), false);
old_inuse = tp->flag & FINUSE;
tp->flag |= FINUSE;
e->type = E_FUNC;
if (!(i = kshsetjmp(e->jbuf))) {
execute(tp->val.t, flags & XERROK, NULL);
i = LRETURN;
}
kshname = old_kshname;
change_xtrace(old_flags[(int)FXTRACE], false);
#ifndef MKSH_LEGACY_MODE
if (tp->flag & FKSH) {
/* Korn style functions restore Flags on return */
old_flags[(int)FXTRACE] = Flag(FXTRACE);
for (type_flags = 0; type_flags < FNFLAGS; ++type_flags)
shell_flags[type_flags] = old_flags[type_flags];
}
#endif
tp->flag = (tp->flag & ~FINUSE) | old_inuse;
/*
* Were we deleted while executing? If so, free the
* execution tree.
*/
if ((tp->flag & (FDELETE|FINUSE)) == FDELETE) {
if (tp->flag & ALLOC) {
tp->flag &= ~ALLOC;
tfree(tp->val.t, tp->areap);
}
tp->flag = 0;
}
switch (i) {
case LRETURN:
case LERROR:
rv = exstat & 0xFF;
break;
case LINTR:
case LEXIT:
case LLEAVE:
case LSHELL:
quitenv(NULL);
unwind(i);
/* NOTREACHED */
default:
quitenv(NULL);
internal_errorf("%s %d", "CFUNC", i);
}
break;
}
/* executable command */
case CEXEC:
/* tracked alias */
case CTALIAS:
if (!(tp->flag&ISSET)) {
if (tp->u2.errnov == ENOENT) {
rv = 127;
warningf(true, "%s: %s", cp, "not found");
} else {
rv = 126;
warningf(true, "%s: %s: %s", cp, "can't execute",
cstrerror(tp->u2.errnov));
}
break;
}
/* set $_ to program's full path */
/* setstr() can't fail here */
setstr(typeset("_", LOCAL | EXPORT, 0, INTEGER, 0),
tp->val.s, KSH_RETURN_ERROR);
/* to fork, we set up a TEXEC node and call execute */
texec.type = TEXEC;
/* for vistree/dumptree */
texec.left = t;
texec.str = tp->val.s;
texec.args = ap;
/* in this case we do not fork, of course */
if (flags & XEXEC) {
if (exec_argv0)
texec.args[0] = exec_argv0;
j_exit();
if (!(flags & XBGND)
#ifndef MKSH_UNEMPLOYED
|| Flag(FMONITOR)
#endif
) {
setexecsig(&sigtraps[SIGINT], SS_RESTORE_ORIG);
setexecsig(&sigtraps[SIGQUIT], SS_RESTORE_ORIG);
}
}
rv = exchild(&texec, flags, xerrok, -1);
break;
}
Leave:
if (flags & XEXEC) {
exstat = rv & 0xFF;
unwind(LLEAVE);
}
return (rv);
}