/*-
* Copyright (c) 2015, 2017
* KO Myung-Hun <komh@chollian.net>
* Copyright (c) 2017
* mirabilos <m@mirbsd.org>
*
* Provided that these terms and disclaimer and all copyright notices
* are retained or reproduced in an accompanying document, permission
* is granted to deal in this work without restriction, including un-
* limited rights to use, publicly perform, distribute, sell, modify,
* merge, give away, or sublicence.
*
* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
* the utmost extent permitted by applicable law, neither express nor
* implied; without malicious intent or gross negligence. In no event
* may a licensor, author or contributor be held liable for indirect,
* direct, other damage, loss, or other issues arising in any way out
* of dealing in the work, even if advised of the possibility of such
* damage or existence of a defect, except proven that it results out
* of said person's immediate fault when using the work as intended.
*/
#define INCL_DOS
#include <os2.h>
#include "sh.h"
#include <klibc/startup.h>
#include <errno.h>
#include <io.h>
#include <unistd.h>
#include <process.h>
__RCSID("$MirOS: src/bin/mksh/os2.c,v 1.8 2017/12/22 16:41:42 tg Exp $");
static char *remove_trailing_dots(char *);
static int access_stat_ex(int (*)(), const char *, void *);
static int test_exec_exist(const char *, char *);
static void response(int *, const char ***);
static char *make_response_file(char * const *);
static void add_temp(const char *);
static void cleanup_temps(void);
static void cleanup(void);
#define RPUT(x) do { \
if (new_argc >= new_alloc) { \
new_alloc += 20; \
if (!(new_argv = realloc(new_argv, \
new_alloc * sizeof(char *)))) \
goto exit_out_of_memory; \
} \
new_argv[new_argc++] = (x); \
} while (/* CONSTCOND */ 0)
#define KLIBC_ARG_RESPONSE_EXCLUDE \
(__KLIBC_ARG_DQUOTE | __KLIBC_ARG_WILDCARD | __KLIBC_ARG_SHELL)
static void
response(int *argcp, const char ***argvp)
{
int i, old_argc, new_argc, new_alloc = 0;
const char **old_argv, **new_argv;
char *line, *l, *p;
FILE *f;
old_argc = *argcp;
old_argv = *argvp;
for (i = 1; i < old_argc; ++i)
if (old_argv[i] &&
!(old_argv[i][-1] & KLIBC_ARG_RESPONSE_EXCLUDE) &&
old_argv[i][0] == '@')
break;
if (i >= old_argc)
/* do nothing */
return;
new_argv = NULL;
new_argc = 0;
for (i = 0; i < old_argc; ++i) {
if (i == 0 || !old_argv[i] ||
(old_argv[i][-1] & KLIBC_ARG_RESPONSE_EXCLUDE) ||
old_argv[i][0] != '@' ||
!(f = fopen(old_argv[i] + 1, "rt")))
RPUT(old_argv[i]);
else {
long filesize;
fseek(f, 0, SEEK_END);
filesize = ftell(f);
fseek(f, 0, SEEK_SET);
line = malloc(filesize + /* type */ 1 + /* NUL */ 1);
if (!line) {
exit_out_of_memory:
fputs("Out of memory while reading response file\n", stderr);
exit(255);
}
line[0] = __KLIBC_ARG_NONZERO | __KLIBC_ARG_RESPONSE;
l = line + 1;
while (fgets(l, (filesize + 1) - (l - (line + 1)), f)) {
p = strchr(l, '\n');
if (p) {
/*
* if a line ends with a backslash,
* concatenate with the next line
*/
if (p > l && p[-1] == '\\') {
char *p1;
int count = 0;
for (p1 = p - 1; p1 >= l &&
*p1 == '\\'; p1--)
count++;
if (count & 1) {
l = p + 1;
continue;
}
}
*p = 0;
}
p = strdup(line);
if (!p)
goto exit_out_of_memory;
RPUT(p + 1);
l = line + 1;
}
free(line);
if (ferror(f)) {
fputs("Cannot read response file\n", stderr);
exit(255);
}
fclose(f);
}
}
RPUT(NULL);
--new_argc;
*argcp = new_argc;
*argvp = new_argv;
}
static void
init_extlibpath(void)
{
const char *vars[] = {
"BEGINLIBPATH",
"ENDLIBPATH",
"LIBPATHSTRICT",
NULL
};
char val[512];
int flag;
for (flag = 0; vars[flag]; flag++) {
DosQueryExtLIBPATH(val, flag + 1);
if (val[0])
setenv(vars[flag], val, 1);
}
}
void
os2_init(int *argcp, const char ***argvp)
{
response(argcp, argvp);
init_extlibpath();
if (!isatty(STDIN_FILENO))
setmode(STDIN_FILENO, O_BINARY);
if (!isatty(STDOUT_FILENO))
setmode(STDOUT_FILENO, O_BINARY);
if (!isatty(STDERR_FILENO))
setmode(STDERR_FILENO, O_BINARY);
atexit(cleanup);
}
void
setextlibpath(const char *name, const char *val)
{
int flag;
char *p, *cp;
if (!strcmp(name, "BEGINLIBPATH"))
flag = BEGIN_LIBPATH;
else if (!strcmp(name, "ENDLIBPATH"))
flag = END_LIBPATH;
else if (!strcmp(name, "LIBPATHSTRICT"))
flag = LIBPATHSTRICT;
else
return;
/* convert slashes to backslashes */
strdupx(cp, val, ATEMP);
for (p = cp; *p; p++) {
if (*p == '/')
*p = '\\';
}
DosSetExtLIBPATH(cp, flag);
afree(cp, ATEMP);
}
/* remove trailing dots */
static char *
remove_trailing_dots(char *name)
{
char *p = strnul(name);
while (--p > name && *p == '.')
/* nothing */;
if (*p != '.' && *p != '/' && *p != '\\' && *p != ':')
p[1] = '\0';
return (name);
}
#define REMOVE_TRAILING_DOTS(name) \
remove_trailing_dots(memcpy(alloca(strlen(name) + 1), name, strlen(name) + 1))
/* alias of stat() */
extern int _std_stat(const char *, struct stat *);
/* replacement for stat() of kLIBC which fails if there are trailing dots */
int
stat(const char *name, struct stat *buffer)
{
return (_std_stat(REMOVE_TRAILING_DOTS(name), buffer));
}
/* alias of access() */
extern int _std_access(const char *, int);
/* replacement for access() of kLIBC which fails if there are trailing dots */
int
access(const char *name, int mode)
{
/*
* On OS/2 kLIBC, X_OK is set only for executable files.
* This prevents scripts from being executed.
*/
if (mode & X_OK)
mode = (mode & ~X_OK) | R_OK;
return (_std_access(REMOVE_TRAILING_DOTS(name), mode));
}
#define MAX_X_SUFFIX_LEN 4
static const char *x_suffix_list[] =
{ "", ".ksh", ".exe", ".sh", ".cmd", ".com", ".bat", NULL };
/* call fn() by appending executable extensions */
static int
access_stat_ex(int (*fn)(), const char *name, void *arg)
{
char *x_name;
const char **x_suffix;
int rc = -1;
size_t x_namelen = strlen(name) + MAX_X_SUFFIX_LEN + 1;
/* otherwise, try to append executable suffixes */
x_name = alloc(x_namelen, ATEMP);
for (x_suffix = x_suffix_list; rc && *x_suffix; x_suffix++) {
strlcpy(x_name, name, x_namelen);
strlcat(x_name, *x_suffix, x_namelen);
rc = fn(x_name, arg);
}
afree(x_name, ATEMP);
return (rc);
}
/* access()/search_access() version */
int
access_ex(int (*fn)(const char *, int), const char *name, int mode)
{
/*XXX this smells fishy --mirabilos */
return (access_stat_ex(fn, name, (void *)mode));
}
/* stat() version */
int
stat_ex(const char *name, struct stat *buffer)
{
return (access_stat_ex(stat, name, buffer));
}
static int
test_exec_exist(const char *name, char *real_name)
{
struct stat sb;
if (stat(name, &sb) < 0 || !S_ISREG(sb.st_mode))
return (-1);
/* safe due to calculations in real_exec_name() */
memcpy(real_name, name, strlen(name) + 1);
return (0);
}
const char *
real_exec_name(const char *name)
{
char x_name[strlen(name) + MAX_X_SUFFIX_LEN + 1];
const char *real_name = name;
if (access_stat_ex(test_exec_exist, real_name, x_name) != -1)
/*XXX memory leak */
strdupx(real_name, x_name, ATEMP);
return (real_name);
}
/* make a response file to pass a very long command line */
static char *
make_response_file(char * const *argv)
{
char rsp_name_arg[] = "@mksh-rsp-XXXXXX";
char *rsp_name = &rsp_name_arg[1];
int i;
int fd;
char *result;
if ((fd = mkstemp(rsp_name)) == -1)
return (NULL);
/* write all the arguments except a 0th program name */
for (i = 1; argv[i]; i++) {
write(fd, argv[i], strlen(argv[i]));
write(fd, "\n", 1);
}
close(fd);
add_temp(rsp_name);
strdupx(result, rsp_name_arg, ATEMP);
return (result);
}
/* alias of execve() */
extern int _std_execve(const char *, char * const *, char * const *);
/* replacement for execve() of kLIBC */
int
execve(const char *name, char * const *argv, char * const *envp)
{
const char *exec_name;
FILE *fp;
char sign[2];
int pid;
int status;
int fd;
int rc;
int saved_mode;
int saved_errno;
/*
* #! /bin/sh : append .exe
* extproc sh : search sh.exe in PATH
*/
exec_name = search_path(name, path, X_OK, NULL);
if (!exec_name) {
errno = ENOENT;
return (-1);
}
/*-
* kLIBC execve() has problems when executing scripts.
* 1. it fails to execute a script if a directory whose name
* is same as an interpreter exists in a current directory.
* 2. it fails to execute a script not starting with sharpbang.
* 3. it fails to execute a batch file if COMSPEC is set to a shell
* incompatible with cmd.exe, such as /bin/sh.
* And ksh process scripts more well, so let ksh process scripts.
*/
errno = 0;
if (!(fp = fopen(exec_name, "rb")))
errno = ENOEXEC;
if (!errno && fread(sign, 1, sizeof(sign), fp) != sizeof(sign))
errno = ENOEXEC;
if (fp && fclose(fp))
errno = ENOEXEC;
if (!errno &&
!((sign[0] == 'M' && sign[1] == 'Z') ||
(sign[0] == 'N' && sign[1] == 'E') ||
(sign[0] == 'L' && sign[1] == 'X')))
errno = ENOEXEC;
if (errno == ENOEXEC)
return (-1);
/*
* Normal OS/2 programs expect that standard IOs, especially stdin,
* are opened in text mode at the startup. By the way, on OS/2 kLIBC
* child processes inherit a translation mode of a parent process.
* As a result, if stdin is set to binary mode in a parent process,
* stdin of child processes is opened in binary mode as well at the
* startup. In this case, some programs such as sed suffer from CR.
*/
saved_mode = setmode(STDIN_FILENO, O_TEXT);
pid = spawnve(P_NOWAIT, exec_name, argv, envp);
saved_errno = errno;
/* arguments too long? */
if (pid == -1 && saved_errno == EINVAL) {
/* retry with a response file */
char *rsp_name_arg = make_response_file(argv);
if (rsp_name_arg) {
char *rsp_argv[3] = { argv[0], rsp_name_arg, NULL };
pid = spawnve(P_NOWAIT, exec_name, rsp_argv, envp);
saved_errno = errno;
afree(rsp_name_arg, ATEMP);
}
}
/* restore translation mode of stdin */
setmode(STDIN_FILENO, saved_mode);
if (pid == -1) {
cleanup_temps();
errno = saved_errno;
return (-1);
}
/* close all opened handles */
for (fd = 0; fd < NUFILE; fd++) {
if (fcntl(fd, F_GETFD) == -1)
continue;
close(fd);
}
while ((rc = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
/* nothing */;
cleanup_temps();
/* Is this possible? And is this right? */
if (rc == -1)
return (-1);
if (WIFSIGNALED(status))
_exit(ksh_sigmask(WTERMSIG(status)));
_exit(WEXITSTATUS(status));
}
static struct temp *templist = NULL;
static void
add_temp(const char *name)
{
struct temp *tp;
tp = alloc(offsetof(struct temp, tffn[0]) + strlen(name) + 1, APERM);
memcpy(tp->tffn, name, strlen(name) + 1);
tp->next = templist;
templist = tp;
}
/* alias of unlink() */
extern int _std_unlink(const char *);
/*
* Replacement for unlink() of kLIBC not supporting to remove files used by
* another processes.
*/
int
unlink(const char *name)
{
int rc;
rc = _std_unlink(name);
if (rc == -1 && errno != ENOENT)
add_temp(name);
return (rc);
}
static void
cleanup_temps(void)
{
struct temp *tp;
struct temp **tpnext;
for (tpnext = &templist, tp = templist; tp; tp = *tpnext) {
if (_std_unlink(tp->tffn) == 0 || errno == ENOENT) {
*tpnext = tp->next;
afree(tp, APERM);
} else {
tpnext = &tp->next;
}
}
}
static void
cleanup(void)
{
cleanup_temps();
}
int
getdrvwd(char **cpp, unsigned int drvltr)
{
PBYTE cp;
ULONG sz;
APIRET rc;
ULONG drvno;
if (DosQuerySysInfo(QSV_MAX_PATH_LENGTH, QSV_MAX_PATH_LENGTH,
&sz, sizeof(sz)) != 0) {
errno = EDOOFUS;
return (-1);
}
/* allocate 'X:/' plus sz plus NUL */
checkoktoadd((size_t)sz, (size_t)4);
cp = aresize(*cpp, (size_t)sz + (size_t)4, ATEMP);
cp[0] = ksh_toupper(drvltr);
cp[1] = ':';
cp[2] = '/';
drvno = ksh_numuc(cp[0]) + 1;
/* NUL is part of space within buffer passed */
++sz;
if ((rc = DosQueryCurrentDir(drvno, cp + 3, &sz)) == 0) {
/* success! */
*cpp = cp;
return (0);
}
afree(cp, ATEMP);
*cpp = NULL;
switch (rc) {
case 15: /* invalid drive */
errno = ENOTBLK;
break;
case 26: /* not dos disk */
errno = ENODEV;
break;
case 108: /* drive locked */
errno = EDEADLK;
break;
case 111: /* buffer overflow */
errno = ENAMETOOLONG;
break;
default:
errno = EINVAL;
}
return (-1);
}