/********************************************************/
/* ntapi: Native API core library */
/* Copyright (C) 2013--2021 SysDeer Technologies, LLC */
/* Released under GPLv2 and GPLv3; see COPYING.NTAPI. */
/********************************************************/
#include <psxtypes/psxtypes.h>
#include <pemagine/pemagine.h>
#include <ntapi/ntapi.h>
#include "ntapi_impl.h"
/**
* rules for parsing the process's command line arguments
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
*
* delimiters:
* -----------
* + white space (ascii 0x20)
* + horizontal tab (ascii 0x09)
*
* quoted strings, and special characters
* --------------------------------------
* + delimiter characters within a quoted string ("string with white space",
* or string" with white "space), stand for their literal respective
* characters.
*
* + a backslash followed by a double quote (\") stands for a literal
* double quote.
*
* + unless followed by a double quote, a backslash is just a (literal)
* backslash.
*
* + when followed by a double quotation mark, an even sequence of 2 or
* more backslashes (2n) should be interpreted as a sequence of n literal
* backslashes. The double quotation mark then designates the start
* or end of a double quoted string.
*
* + when followed by a double quotation mark, an odd sequence of 2 or
* more backslashes (2n+1) should be interpreted as a sequence of n
* literal backslashes, followed by a single literal double quote.
*
* + if found within a double quoted string, a sequence of two double
* quotation marks should be interpreted as a single literal double
* quote.
*
* + balanced nesting of syntactic double quotes is permitted.
*
**/
/* free-standing process runtime data */
static nt_runtime_data __rtdata;
int32_t __stdcall __ntapi_tt_parse_cmd_line_args_utf16(
__in wchar16_t * cmd_line,
__out int * arg_count,
__in wchar16_t * args_buffer,
__in size_t args_buffer_len,
__out size_t * args_bytes_written __optional,
__in wchar16_t ** argv_buffer,
__in size_t argv_buffer_len,
__in uint32_t arg_flags)
{
/**
* parse the command line arguments pointed to by cmd_line,
* copy the parsed arguments to args_buffer,
* and return 0 upon success.
*
* cmd_line must be a valid pointer to a command line string,
* and args_buffer, argv_buffer, and arg_count should
* all be aligned; furthermore, args_buffer_len and
* and argv_buffer_len must be exact multiples of sizeof(size_t).
*
* In case of an error, report failure using the appropriate
* native status code.
**/
/**
* UTF-16: no need to fully determine the code point of the
* current character; all we need to do is validate the
* character or surrogate pair, and set the value of
* wch_next accordingly.
**/
#define HORIZONTAL_TAB 0x09
#define WHITE_SPACE 0x20
#define DOUBLE_QUOTE 0x22
#define SINGLE_QUOTE 0x27
#define BACKSLASH 0x5C
#define IS_DELIMITER(x) ((x == HORIZONTAL_TAB) || (x == WHITE_SPACE))
#define TEST_ARGS_BUFFER(nbytes) \
if ((uintptr_t)arg + nbytes \
> (uintptr_t)args_buffer + args_buffer_len) { \
return NT_STATUS_BUFFER_TOO_SMALL; \
}
#define ADD_N_BACKSLASHES \
TEST_ARGS_BUFFER(backslash_count * sizeof(wchar16_t)); \
for (islash = 0; \
islash < backslash_count; \
islash++) { \
*arg = BACKSLASH; \
arg++; \
} \
backslash_count = 0;
#define ADD_SINGLE_WCHAR16_t(x) \
TEST_ARGS_BUFFER(sizeof(wchar16_t)); \
*arg = x; \
arg++;
wchar16_t * arg; /* null-terminated, copied to buffer */
wchar16_t ** parg; /* next pointer in the argv array */
wchar16_t * wch; /* character being processed */
wchar16_t * wch_next;
unsigned int backslash_count;
unsigned int islash;
unsigned char quoted_state;
/* unused param */
(void)arg_flags;
/* check parameters for validity and alignment */
if ((!(uintptr_t)cmd_line) || (*cmd_line == 0))
/* we require at least one argument */
return NT_STATUS_INVALID_PARAMETER_1;
else if (__NT_IS_MISALIGNED_BUFFER(args_buffer))
return NT_STATUS_INVALID_PARAMETER_3;
else if (__NT_IS_MISALIGNED_LENGTH(args_buffer_len))
return NT_STATUS_INVALID_PARAMETER_4;
else if (__NT_IS_MISALIGNED_BUFFER(argv_buffer))
return NT_STATUS_INVALID_PARAMETER_6;
else if (__NT_IS_MISALIGNED_LENGTH(argv_buffer_len))
return NT_STATUS_INVALID_PARAMETER_7;
else if (__NT_IS_MISALIGNED_INT_BUFFER(arg_count))
return NT_STATUS_INVALID_PARAMETER_2;
/* zero-out the aligned buffers */
__ntapi->tt_aligned_block_memset(args_buffer,0,args_buffer_len);
__ntapi->tt_aligned_block_memset(argv_buffer,0,argv_buffer_len);
/* initialize */
wch = cmd_line;
arg = args_buffer;
parg = argv_buffer;
*parg = arg;
*arg_count = 0;
quoted_state = 0;
backslash_count = 0;
/* arg points to the first character of a command line argument */
/* parg points to the next pointer in argv_buffer */
while (*wch) {
if (!(quoted_state) && (IS_DELIMITER(*wch))) {
/* pending backslashes? */
if (backslash_count)
ADD_N_BACKSLASHES;
/* reached a delimiter outside of a quoted string */
/* argument: alignment and null-termination */
arg = (wchar16_t *)((((uintptr_t)arg + sizeof(size_t))
| (sizeof(size_t) - 1))
^ (sizeof(size_t) - 1));
/* skip this and remaining delimiters */
wch_next = wch + 1;
while ((*wch_next) && (IS_DELIMITER(*wch_next)))
wch_next++;
/* keep going? */
if (*wch_next == 0) {
/* no more characters to process */
/* nothing to do */
} else if ((uintptr_t)parg >= \
(uintptr_t)argv_buffer \
+ argv_buffer_len) {
/* argv_buffer is too small */
return NT_STATUS_BUFFER_TOO_SMALL;
} else if ((uintptr_t)arg >= \
(uintptr_t)args_buffer \
+ args_buffer_len) {
/* args_buffer is too small */
return NT_STATUS_BUFFER_TOO_SMALL;
} else {
/* advance parg, set last member */
parg++;
*parg = arg;
}
} else {
/* the current character is not a delimiter... */
/* determine wch_next */
if ((*wch < 0xD800) || (*wch >= 0xE000)) {
/* in the BMP, single 16-bit representation */
wch_next = wch + 1;
} else if ((*wch >= 0xD800) && (*wch < 0xDC00)) {
/* validate surrogate pair */
wch_next = wch + 1;
if ((*wch_next >= 0xDC00) && (*wch_next < 0xE000))
/* this is a valid surrogate pair */
wch_next++;
else
return NT_STATUS_ILLEGAL_CHARACTER;
} else
return NT_STATUS_ILLEGAL_CHARACTER;
/* we now know the position of this and the next character */
/* continue with special cases */
if (quoted_state && (*wch == DOUBLE_QUOTE) \
&& (*wch_next == DOUBLE_QUOTE)) {
/**
* two consecutive double quotation marks
* within a quoted string:
* add a single quotation mark to the argument
**/
ADD_SINGLE_WCHAR16_t(DOUBLE_QUOTE);
wch_next++;
} else if (((backslash_count % 2) == 0) \
&& (*wch == BACKSLASH) \
&& (*wch_next == DOUBLE_QUOTE)) {
/* 2n+1 backslashes followed by a double quote */
backslash_count /= 2;
/* add n backslashes */
ADD_N_BACKSLASHES;
/* add a literal double quotation mark */
ADD_SINGLE_WCHAR16_t(DOUBLE_QUOTE);
/* get ready for next character */
wch_next++;
} else if (backslash_count && (*wch == DOUBLE_QUOTE)) {
/* 2n backslashes followed by a double quote */
backslash_count /= 2;
/* add n backslashes */
ADD_N_BACKSLASHES;
/* turn quoted_state on/off */
quoted_state = !quoted_state;
} else if ((*wch == BACKSLASH) \
&& (*wch_next == BACKSLASH)) {
/* this is a sequence of two backslashes */
backslash_count += 2;
wch_next++;
} else {
/* copy pending backslashes as needed */
if (backslash_count)
ADD_N_BACKSLASHES;
if (*wch == DOUBLE_QUOTE) {
/* turn quoted_state on/off */
quoted_state = !quoted_state;
} else {
/* copy either two or four bytes */
ADD_SINGLE_WCHAR16_t(*wch);
wch++;
/* surrogate pair? */
if (wch < wch_next) {
ADD_SINGLE_WCHAR16_t(*wch);
}
}
}
}
/* proceed to the next character (or null termination) */
wch = wch_next;
}
/* pending backslashes? */
if (backslash_count)
ADD_N_BACKSLASHES;
/* null termination */
ADD_SINGLE_WCHAR16_t(0);
/* how many arguments did you say? */
*arg_count = (int)(((uintptr_t)parg - (uintptr_t)argv_buffer)
/ sizeof(size_t) + 1);
/* output bytes written */
if (args_bytes_written)
*args_bytes_written = (uintptr_t)arg - (uintptr_t)args_buffer;
return NT_STATUS_SUCCESS;
}
int32_t __stdcall __ntapi_tt_get_argv_envp_utf16(
__out int * argc,
__out wchar16_t *** wargv,
__out wchar16_t *** wenvp,
__in uint32_t flags,
__in void * ext_params __optional,
__out void * reserved __optional)
{
nt_runtime_data * rtdata;
nt_argv_envp_block_info main_params_internal;
nt_argv_envp_block_info * main_params;
nt_get_argv_envp_ext_params * __ext_params;
ntapi_internals * __internals;
unsigned idx;
int32_t status;
uintptr_t addr;
intptr_t offset;
wchar16_t * wch_s;
wchar16_t * wch_dst;
wchar16_t ** wch_p;
char ** ch_p;
uintptr_t * psrc;
uintptr_t * pdst;
uintptr_t * paligned;
wchar16_t * pboundary;
/* unused param */
(void)reserved;
/* init */
__internals = __ntapi_internals();
/* use internal buffer? */
if (flags & NT_GET_ARGV_ENVP_USE_CALLER_BUFFER) {
__ext_params = (nt_get_argv_envp_ext_params *)ext_params;
main_params = &(__ext_params->argv_envp_block_info);
} else {
/* pointers to internal/local structures */
main_params = &main_params_internal;
/* init */
__ntapi->tt_aligned_block_memset(
main_params,0,
sizeof(*main_params));
/* use internal buffer */
main_params->cmd_line = __ntapi_tt_get_cmd_line_utf16();
main_params->wargv_buffer = __internals->ntapi_img_sec_bss->argv_envp_array;
main_params->wargv_buffer_len = __NT_BSS_ARGV_BUFFER_SIZE;
main_params->argv_envp_ptr_total = (int)(main_params->wargv_buffer_len
/ sizeof(uintptr_t));
main_params->wargs_buffer = (wchar16_t *)&(__internals->ntapi_img_sec_bss->args_envs_buffer);
main_params->wargs_buffer_len = __NT_BSS_ARGS_BUFFER_SIZE;
}
/* (__ntapi_parse_cmd_line_args_utf16 will zero-out both buffers) */
status = __ntapi_tt_parse_cmd_line_args_utf16(
main_params->cmd_line,
&main_params->argc,
main_params->wargs_buffer,
main_params->wargs_buffer_len,
&main_params->wargs_bytes_written,
main_params->wargv_buffer,
main_params->wargv_buffer_len,
0);
if (status) return status;
/* argv[] needs a terminating null pointer */
if ((unsigned)main_params->argc == main_params->argv_envp_ptr_total)
return NT_STATUS_BUFFER_TOO_SMALL;
/* set idx to the envp[0] array index */
idx = main_params->argc + 1;
/* set wenvp[] to its starting address */
main_params->wenvp_buffer = &main_params->wargv_buffer[idx];
/* update wargv_buffer_len and envp_buffer_len */
main_params->wenvp_buffer_len = main_params->wargv_buffer_len
- (idx * sizeof(uintptr_t));
main_params->wargv_buffer_len = idx * sizeof(uintptr_t);
/* align wenvs at pointer-size boundary */
main_params->wargs_bytes_written += sizeof(uintptr_t) - 1;
main_params->wargs_bytes_written /= sizeof(uintptr_t);
main_params->wargs_bytes_written *= sizeof(uintptr_t);
/* book-keeping */
main_params->wenvs_buffer = main_params->wargs_buffer
+ main_params->wargs_bytes_written;
main_params->wenvs_buffer_len = main_params->wargs_buffer_len
- main_params->wargs_bytes_written;
main_params->wargs_buffer_len = main_params->wargs_bytes_written;
/* peb environment block (read-only) */
wch_s = __ntapi_tt_get_peb_env_block_utf16();
if ((!wch_s) || (!*wch_s))
return NT_STATUS_DLL_INIT_FAILED;
/* populate the envp[] array */
while ((*wch_s) && (idx < main_params->argv_envp_ptr_total)) {
main_params->envc++;
wch_p = &(main_params->wargv_buffer[idx]);
*wch_p = wch_s;
/* skip the rest of the environment variable */
while (*++wch_s);
/* advance to the next variable (or final null termination) */
wch_s++;
idx++;
}
/* envp[] needs a terminating null pointer */
if ((*wch_s) && (idx = main_params->argv_envp_ptr_total))
return NT_STATUS_BUFFER_TOO_SMALL;
/* copy environment? */
if (flags & NT_GET_ARGV_ENVP_COPY_ENVIRONMENT) {
/* wch_s now points at the final null termination */
main_params->wenvs_bytes_used =
((uintptr_t)wch_s
- (uintptr_t)(*main_params->wenvp_buffer));
/* do we have enough room? */
if (main_params->wenvs_buffer_len < main_params->wenvs_bytes_used)
return NT_STATUS_BUFFER_TOO_SMALL;
/* upper boundary */
pboundary = ++wch_s;
/* you'd expect the peb environment block to be aligned,
but one can never know... */
wch_s = *main_params->wenvp_buffer;
wch_dst = main_params->wenvs_buffer;
while ((uintptr_t)wch_s % sizeof(uintptr_t)) {
*wch_dst = *wch_s;
wch_s++;
wch_dst++;
}
/* copy the aligned portion of the environment block */
addr = (uintptr_t)(pboundary);
addr /= sizeof(uintptr_t);
addr *= sizeof(uintptr_t);
paligned = (uintptr_t *)addr;
psrc = (uintptr_t *)wch_s;
pdst = (uintptr_t *)wch_dst;
while (psrc < paligned) {
*pdst = *psrc;
psrc++;
pdst++;
}
/* copy any remaining bytes */
wch_s = (wchar16_t *)paligned;
wch_dst = (wchar16_t *)pdst;
while (wch_s < pboundary) {
*wch_dst = *wch_s;
wch_s++;
wch_dst++;
}
/* finally, we update the envp[] pointers */
offset = (intptr_t)main_params->wenvs_buffer
- (intptr_t)*main_params->wenvp_buffer;
wch_p = main_params->wenvp_buffer;
while (*wch_p) {
addr = ((uintptr_t)*wch_p) + offset;
*wch_p = (wchar16_t *)addr;
wch_p++;
}
}
/* (command line arguments always get validated) */
/* validate the environment block? */
if (flags & NT_GET_ARGV_ENVP_VALIDATE_UTF16) {
wch_p = main_params->wenvp_buffer;
while (*wch_p) {
status = __ntapi->uc_validate_unicode_stream_utf16(
*wch_p,
0,0,0,0,0);
if (status != NT_STATUS_SUCCESS)
return status;
else
wch_p++;
}
}
/* once */
if (!__internals->rtdata) {
__ntapi->tt_get_runtime_data(
&__internals->rtdata,
main_params->wargv_buffer);
if (!__internals->rtdata) {
__internals->rtdata = &__rtdata;
if ((status =__ntapi->tt_init_runtime_data(&__rtdata)))
return status;
} else if ((status =__ntapi->tt_update_runtime_data(__internals->rtdata)))
return status;
rtdata = __internals->rtdata;
rtdata->peb_envc = main_params->envc;
rtdata->peb_argc = main_params->argc;
rtdata->peb_wargv = main_params->wargv_buffer;
rtdata->peb_wenvp = main_params->wenvp_buffer;
/* integral wargv, wenvp, argv, envp */
if (rtdata->wargv) {
rtdata->wargv += (uintptr_t)rtdata / sizeof(wchar16_t *);
for (wch_p=rtdata->wargv; *wch_p; wch_p++)
*wch_p += (uintptr_t)rtdata / sizeof(wchar16_t);
};
if (rtdata->wenvp) {
rtdata->wenvp += (uintptr_t)rtdata / sizeof(wchar16_t *);
for (wch_p=rtdata->wenvp; *wch_p; wch_p++)
*wch_p += (uintptr_t)rtdata / sizeof(wchar16_t);
}
if (rtdata->argv) {
rtdata->argv += (uintptr_t)rtdata / sizeof(char *);
for (ch_p=rtdata->argv; *ch_p; ch_p++)
*ch_p += (uintptr_t)rtdata;
rtdata->argc = (int32_t)(ch_p - rtdata->argv);
};
if (rtdata->envp) {
rtdata->envp += (uintptr_t)rtdata / sizeof(char *);
for (ch_p=rtdata->envp; *ch_p; ch_p++)
*ch_p += (uintptr_t)rtdata;
rtdata->envc = (int32_t)(ch_p - rtdata->envp);
};
}
/* we're good */
*argc = main_params->argc;
*wargv = main_params->wargv_buffer;
*wenvp = main_params->wenvp_buffer;
return NT_STATUS_SUCCESS;
}
int32_t __stdcall __ntapi_tt_get_argv_envp_utf8(
__out int * argc,
__out char *** argv,
__out char *** envp,
__in uint32_t flags,
__in void * ext_params __optional,
__out void * reserved __optional)
{
int32_t status;
ntapi_internals * __internals;
wchar16_t ** wargv;
wchar16_t ** wenvp;
uint32_t pcount;
nt_get_argv_envp_ext_params __ext_params_internal;
nt_get_argv_envp_ext_params * __ext_params;
nt_argv_envp_block_info * main_params;
/* use internal buffer? */
if (flags & NT_GET_ARGV_ENVP_USE_CALLER_BUFFER) {
__ext_params = (nt_get_argv_envp_ext_params *)ext_params;
main_params = &__ext_params->argv_envp_block_info;
} else {
/* pointers to internal/local structures */
__ext_params = &__ext_params_internal;
main_params = &__ext_params->argv_envp_block_info;
/* init */
__ntapi->tt_aligned_block_memset(
main_params,0,
sizeof(*main_params));
__internals = __ntapi_internals();
/* use internal buffer */
main_params->cmd_line = __ntapi_tt_get_cmd_line_utf16();
main_params->wargv_buffer = __internals->ntapi_img_sec_bss->argv_envp_array;
main_params->wargv_buffer_len = __NT_BSS_ARGV_BUFFER_SIZE;
main_params->argv_envp_ptr_total = (int)(main_params->wargv_buffer_len
/ sizeof(uintptr_t));
main_params->wargs_buffer = (wchar16_t *)&(__internals->ntapi_img_sec_bss->args_envs_buffer);
main_params->wargs_buffer_len = __NT_BSS_ARGS_BUFFER_SIZE;
}
/* start with obtaining the utf-16 environment */
status = __ntapi->tt_get_argv_envp_utf16(
argc,
&wargv,
&wenvp,
flags | NT_GET_ARGV_ENVP_USE_CALLER_BUFFER,
__ext_params,
reserved);
if (status) return status;
/* enough pointers left? */
pcount = main_params->argc + 1 + main_params->envc + 1;
if (pcount > (main_params->argv_envp_ptr_total / 2))
return NT_STATUS_BUFFER_TOO_SMALL;
else if ((main_params->wenvs_buffer_len - main_params->wenvs_bytes_used)
< sizeof(uintptr_t))
return NT_STATUS_BUFFER_TOO_SMALL;
/* first args byte should be aligned at pointer-size boundary */
main_params->wenvs_bytes_used += sizeof(uintptr_t) - 1;
main_params->wenvs_bytes_used /= sizeof(uintptr_t);
main_params->wenvs_bytes_used *= sizeof(uintptr_t);
/* book-keeping */
/* block reminder: wargs -- wenvs -- args -- envs */
main_params->argv = (char **)main_params->wenvp_buffer;
main_params->argv += main_params->envc + 1;
main_params->args_buffer = (char *)main_params->wenvs_buffer;
main_params->args_buffer += main_params->wenvs_bytes_used;
main_params->args_buffer_len = main_params->wenvs_buffer_len
- main_params->wenvs_bytes_used;
main_params->wenvs_buffer_len = main_params->wenvs_bytes_used;
/* create a utf-8 argv[] array */
status = __ntapi_tt_array_convert_utf16_to_utf8(
main_params->wargv_buffer,
main_params->argv,
0,
main_params->args_buffer,
main_params->args_buffer_len,
&main_params->args_bytes_written);
if (status) return status;
/* first envs byte should be aligned to pointer-size boundary */
main_params->args_bytes_written += sizeof(uintptr_t) - 1;
main_params->args_bytes_written /= sizeof(uintptr_t);
main_params->args_bytes_written *= sizeof(uintptr_t);
/* book-keeping */
main_params->envp = main_params->argv + main_params->argc + 1;
main_params->envs_buffer = main_params->args_buffer
+ main_params->args_bytes_written;
main_params->envs_buffer_len = main_params->args_buffer_len
- main_params->args_bytes_written;
main_params->args_buffer_len = main_params->args_bytes_written;
/* subsequent streams (if any) should be aligned to pointer-size boundary */
main_params->envs_bytes_used += sizeof(uintptr_t) - 1;
main_params->envs_bytes_used /= sizeof(uintptr_t);
main_params->envs_bytes_used *= sizeof(uintptr_t);
/* create a utf-8 envp[] array */
status = __ntapi_tt_array_convert_utf16_to_utf8(
main_params->wenvp_buffer,
main_params->envp,
0,
main_params->envs_buffer,
main_params->envs_buffer_len,
&main_params->envs_bytes_used);
if (status) return status;
/* we're good */
*argc = main_params->argc;
*argv = main_params->argv;
*envp = main_params->envp;
return NT_STATUS_SUCCESS;
}
wchar16_t * __stdcall __ntapi_tt_get_cmd_line_utf16(void)
{
nt_peb * peb;
return (peb = (nt_peb *)pe_get_peb_address())
? peb->process_params->command_line.buffer
: 0;
}
wchar16_t * __stdcall __ntapi_tt_get_peb_env_block_utf16(void)
{
nt_peb * peb;
return (peb = (nt_peb *)pe_get_peb_address())
? peb->process_params->environment
: 0;
}