winpr/libwinpr/utils/cmdline.c

 
#include <winpr/config.h>
 
#include <winpr/crt.h>
#include <winpr/assert.h>
#include <winpr/cmdline.h>
 
#include "../log.h"
 
#define TAG WINPR_TAG("commandline")
 
static void log_error(DWORD flags, LPCSTR message, int index, LPCSTR argv)
{
  if ((flags & COMMAND_LINE_SILENCE_PARSER) == 0)
    WLog_ERR(TAG, message, index, argv);
}
 
int CommandLineParseArgumentsA(int argc, LPSTR* argv, COMMAND_LINE_ARGUMENT_A* options, DWORD flags,
                               void* context, COMMAND_LINE_PRE_FILTER_FN_A preFilter,
                               COMMAND_LINE_POST_FILTER_FN_A postFilter)
{
  int status = 0;
  int count = 0;
  BOOL notescaped = FALSE;
  const char* sigil = NULL;
  size_t sigil_length = 0;
  char* keyword = NULL;
  size_t keyword_index = 0;
  char* separator = NULL;
  char* value = NULL;
  int toggle = 0;
 
  if (!argv)
    return status;
 
  if (argc == 1)
  {
    if (flags & COMMAND_LINE_IGN_UNKNOWN_KEYWORD)
      status = 0;
    else
      status = COMMAND_LINE_STATUS_PRINT_HELP;
 
    return status;
  }
 
  for (int i = 1; i < argc; i++)
  {
    size_t keyword_length = 0;
    BOOL found = FALSE;
    BOOL escaped = TRUE;
 
    if (preFilter)
    {
      count = preFilter(context, i, argc, argv);
 
      if (count < 0)
      {
        log_error(flags, "Failed for index %d [%s]: PreFilter rule could not be applied", i,
                  argv[i]);
        status = COMMAND_LINE_ERROR;
        return status;
      }
 
      if (count > 0)
      {
        i += (count - 1);
        continue;
      }
    }
 
    sigil = argv[i];
    size_t length = strlen(argv[i]);
 
    if ((sigil[0] == '/') && (flags & COMMAND_LINE_SIGIL_SLASH))
    {
      sigil_length = 1;
    }
    else if ((sigil[0] == '-') && (flags & COMMAND_LINE_SIGIL_DASH))
    {
      sigil_length = 1;
 
      if (length > 2)
      {
        if ((sigil[1] == '-') && (flags & COMMAND_LINE_SIGIL_DOUBLE_DASH))
          sigil_length = 2;
      }
    }
    else if ((sigil[0] == '+') && (flags & COMMAND_LINE_SIGIL_PLUS_MINUS))
    {
      sigil_length = 1;
    }
    else if ((sigil[0] == '-') && (flags & COMMAND_LINE_SIGIL_PLUS_MINUS))
    {
      sigil_length = 1;
    }
    else if (flags & COMMAND_LINE_SIGIL_NONE)
    {
      sigil_length = 0;
    }
    else if (flags & COMMAND_LINE_SIGIL_NOT_ESCAPED)
    {
      if (notescaped)
      {
        log_error(flags, "Failed at index %d [%s]: Unescaped sigil", i, argv[i]);
        return COMMAND_LINE_ERROR;
      }
 
      sigil_length = 0;
      escaped = FALSE;
      notescaped = TRUE;
    }
    else
    {
      log_error(flags, "Failed at index %d [%s]: Invalid sigil", i, argv[i]);
      return COMMAND_LINE_ERROR;
    }
 
    if ((sigil_length > 0) || (flags & COMMAND_LINE_SIGIL_NONE) ||
        (flags & COMMAND_LINE_SIGIL_NOT_ESCAPED))
    {
      if (length < (sigil_length + 1))
      {
        if ((flags & COMMAND_LINE_IGN_UNKNOWN_KEYWORD))
          continue;
 
        return COMMAND_LINE_ERROR_NO_KEYWORD;
      }
 
      keyword_index = sigil_length;
      keyword = &argv[i][keyword_index];
      toggle = -1;
 
      if (flags & COMMAND_LINE_SIGIL_ENABLE_DISABLE)
      {
        if (strncmp(keyword, "enable-", 7) == 0)
        {
          toggle = TRUE;
          keyword_index += 7;
          keyword = &argv[i][keyword_index];
        }
        else if (strncmp(keyword, "disable-", 8) == 0)
        {
          toggle = FALSE;
          keyword_index += 8;
          keyword = &argv[i][keyword_index];
        }
      }
 
      separator = NULL;
 
      if ((flags & COMMAND_LINE_SEPARATOR_COLON) && (!separator))
        separator = strchr(keyword, ':');
 
      if ((flags & COMMAND_LINE_SEPARATOR_EQUAL) && (!separator))
        separator = strchr(keyword, '=');
 
      if (separator)
      {
        SSIZE_T separator_index = (separator - argv[i]);
        SSIZE_T value_index = separator_index + 1;
        keyword_length = WINPR_ASSERTING_INT_CAST(size_t, (separator - keyword));
        value = &argv[i][value_index];
      }
      else
      {
        if (length < keyword_index)
        {
          log_error(flags, "Failed at index %d [%s]: Argument required", i, argv[i]);
          return COMMAND_LINE_ERROR;
        }
 
        keyword_length = length - keyword_index;
        value = NULL;
      }
 
      if (!escaped)
        continue;
 
      for (size_t j = 0; options[j].Name != NULL; j++)
      {
        COMMAND_LINE_ARGUMENT_A* cur = &options[j];
        BOOL match = FALSE;
 
        if (strncmp(cur->Name, keyword, keyword_length) == 0)
        {
          if (strlen(cur->Name) == keyword_length)
            match = TRUE;
        }
 
        if ((!match) && (cur->Alias != NULL))
        {
          if (strncmp(cur->Alias, keyword, keyword_length) == 0)
          {
            if (strlen(cur->Alias) == keyword_length)
              match = TRUE;
          }
        }
 
        if (!match)
          continue;
 
        found = match;
        cur->Index = i;
 
        if ((flags & COMMAND_LINE_SEPARATOR_SPACE) && ((i + 1) < argc))
        {
          BOOL argument = 0;
          int value_present = 1;
 
          if (flags & COMMAND_LINE_SIGIL_DASH)
          {
            if (strncmp(argv[i + 1], "-", 1) == 0)
              value_present = 0;
          }
 
          if (flags & COMMAND_LINE_SIGIL_DOUBLE_DASH)
          {
            if (strncmp(argv[i + 1], "--", 2) == 0)
              value_present = 0;
          }
 
          if (flags & COMMAND_LINE_SIGIL_SLASH)
          {
            if (strncmp(argv[i + 1], "/", 1) == 0)
              value_present = 0;
          }
 
          if ((cur->Flags & COMMAND_LINE_VALUE_REQUIRED) ||
              (cur->Flags & COMMAND_LINE_VALUE_OPTIONAL))
            argument = TRUE;
          else
            argument = FALSE;
 
          if (value_present && argument)
          {
            i++;
            value = argv[i];
          }
          else if (!value_present && (cur->Flags & COMMAND_LINE_VALUE_OPTIONAL))
          {
            value = NULL;
          }
          else if (!value_present && argument)
          {
            log_error(flags, "Failed at index %d [%s]: Argument required", i, argv[i]);
            return COMMAND_LINE_ERROR;
          }
        }
 
        if (!(flags & COMMAND_LINE_SEPARATOR_SPACE))
        {
          if (value && (cur->Flags & COMMAND_LINE_VALUE_FLAG))
          {
            log_error(flags, "Failed at index %d [%s]: Unexpected value", i, argv[i]);
            return COMMAND_LINE_ERROR_UNEXPECTED_VALUE;
          }
        }
        else
        {
          if (value && (cur->Flags & COMMAND_LINE_VALUE_FLAG))
          {
            i--;
            value = NULL;
          }
        }
 
        if (!value && (cur->Flags & COMMAND_LINE_VALUE_REQUIRED))
        {
          log_error(flags, "Failed at index %d [%s]: Missing value", i, argv[i]);
          status = COMMAND_LINE_ERROR_MISSING_VALUE;
          return status;
        }
 
        cur->Flags |= COMMAND_LINE_ARGUMENT_PRESENT;
 
        if (value)
        {
          if (!(cur->Flags & (COMMAND_LINE_VALUE_OPTIONAL | COMMAND_LINE_VALUE_REQUIRED)))
          {
            log_error(flags, "Failed at index %d [%s]: Unexpected value", i, argv[i]);
            return COMMAND_LINE_ERROR_UNEXPECTED_VALUE;
          }
 
          cur->Value = value;
          cur->Flags |= COMMAND_LINE_VALUE_PRESENT;
        }
        else
        {
          if (cur->Flags & COMMAND_LINE_VALUE_FLAG)
          {
            cur->Value = (LPSTR)1;
            cur->Flags |= COMMAND_LINE_VALUE_PRESENT;
          }
          else if (cur->Flags & COMMAND_LINE_VALUE_BOOL)
          {
            if (flags & COMMAND_LINE_SIGIL_ENABLE_DISABLE)
            {
              if (toggle == -1)
                cur->Value = BoolValueTrue;
              else if (!toggle)
                cur->Value = BoolValueFalse;
              else
                cur->Value = BoolValueTrue;
            }
            else
            {
              if (sigil[0] == '+')
                cur->Value = BoolValueTrue;
              else if (sigil[0] == '-')
                cur->Value = BoolValueFalse;
              else
                cur->Value = BoolValueTrue;
            }
 
            cur->Flags |= COMMAND_LINE_VALUE_PRESENT;
          }
        }
 
        if (postFilter)
        {
          count = postFilter(context, &options[j]);
 
          if (count < 0)
          {
            log_error(flags,
                      "Failed at index %d [%s]: PostFilter rule could not be applied",
                      i, argv[i]);
            status = COMMAND_LINE_ERROR;
            return status;
          }
        }
 
        if (cur->Flags & COMMAND_LINE_PRINT)
          return COMMAND_LINE_STATUS_PRINT;
        else if (cur->Flags & COMMAND_LINE_PRINT_HELP)
          return COMMAND_LINE_STATUS_PRINT_HELP;
        else if (cur->Flags & COMMAND_LINE_PRINT_VERSION)
          return COMMAND_LINE_STATUS_PRINT_VERSION;
        else if (cur->Flags & COMMAND_LINE_PRINT_BUILDCONFIG)
          return COMMAND_LINE_STATUS_PRINT_BUILDCONFIG;
      }
 
      if (!found && (flags & COMMAND_LINE_IGN_UNKNOWN_KEYWORD) == 0)
      {
        log_error(flags, "Failed at index %d [%s]: Unexpected keyword", i, argv[i]);
        return COMMAND_LINE_ERROR_NO_KEYWORD;
      }
    }
  }
 
  return status;
}
 
int CommandLineParseArgumentsW(WINPR_ATTR_UNUSED int argc, WINPR_ATTR_UNUSED LPWSTR* argv,
                               WINPR_ATTR_UNUSED COMMAND_LINE_ARGUMENT_W* options,
                               WINPR_ATTR_UNUSED DWORD flags, WINPR_ATTR_UNUSED void* context,
                               WINPR_ATTR_UNUSED COMMAND_LINE_PRE_FILTER_FN_W preFilter,
                               WINPR_ATTR_UNUSED COMMAND_LINE_POST_FILTER_FN_W postFilter)
{
  WLog_ERR("TODO", "TODO: implement");
  return 0;
}
 
int CommandLineClearArgumentsA(COMMAND_LINE_ARGUMENT_A* options)
{
  for (size_t i = 0; options[i].Name != NULL; i++)
  {
    options[i].Flags &= COMMAND_LINE_INPUT_FLAG_MASK;
    options[i].Value = NULL;
  }
 
  return 0;
}
 
int CommandLineClearArgumentsW(COMMAND_LINE_ARGUMENT_W* options)
{
  for (int i = 0; options[i].Name != NULL; i++)
  {
    options[i].Flags &= COMMAND_LINE_INPUT_FLAG_MASK;
    options[i].Value = NULL;
  }
 
  return 0;
}
 
const COMMAND_LINE_ARGUMENT_A* CommandLineFindArgumentA(const COMMAND_LINE_ARGUMENT_A* options,
                                                        LPCSTR Name)
{
  WINPR_ASSERT(options);
  WINPR_ASSERT(Name);
 
  for (size_t i = 0; options[i].Name != NULL; i++)
  {
    if (strcmp(options[i].Name, Name) == 0)
      return &options[i];
 
    if (options[i].Alias != NULL)
    {
      if (strcmp(options[i].Alias, Name) == 0)
        return &options[i];
    }
  }
 
  return NULL;
}
 
const COMMAND_LINE_ARGUMENT_W* CommandLineFindArgumentW(const COMMAND_LINE_ARGUMENT_W* options,
                                                        LPCWSTR Name)
{
  WINPR_ASSERT(options);
  WINPR_ASSERT(Name);
 
  for (size_t i = 0; options[i].Name != NULL; i++)
  {
    if (_wcscmp(options[i].Name, Name) == 0)
      return &options[i];
 
    if (options[i].Alias != NULL)
    {
      if (_wcscmp(options[i].Alias, Name) == 0)
        return &options[i];
    }
  }
 
  return NULL;
}
 
const COMMAND_LINE_ARGUMENT_A* CommandLineFindNextArgumentA(const COMMAND_LINE_ARGUMENT_A* argument)
{
  const COMMAND_LINE_ARGUMENT_A* nextArgument = NULL;
 
  if (!argument || !argument->Name)
    return NULL;
 
  nextArgument = &argument[1];
 
  if (nextArgument->Name == NULL)
    return NULL;
 
  return nextArgument;
}
 
static int is_quoted(char c)
{
  switch (c)
  {
    case '"':
      return 1;
    case '\'':
      return -1;
    default:
      return 0;
  }
}
 
static size_t get_element_count(const char* list, BOOL* failed, BOOL fullquoted)
{
  size_t count = 0;
  int quoted = 0;
  BOOL finished = FALSE;
  BOOL first = TRUE;
  const char* it = list;
 
  if (!list)
    return 0;
  if (strlen(list) == 0)
    return 0;
 
  while (!finished)
  {
    BOOL nextFirst = FALSE;
    switch (*it)
    {
      case '\0':
        if (quoted != 0)
        {
          WLog_ERR(TAG, "Invalid argument (missing closing quote) '%s'", list);
          *failed = TRUE;
          return 0;
        }
        finished = TRUE;
        break;
      case '\'':
      case '"':
        if (!fullquoted)
        {
          int now = is_quoted(*it);
          if (now == quoted)
            quoted = 0;
          else if (quoted == 0)
            quoted = now;
        }
        break;
      case ',':
        if (first)
        {
          WLog_ERR(TAG, "Invalid argument (empty list elements) '%s'", list);
          *failed = TRUE;
          return 0;
        }
        if (quoted == 0)
        {
          nextFirst = TRUE;
          count++;
        }
        break;
      default:
        break;
    }
 
    first = nextFirst;
    it++;
  }
  return count + 1;
}
 
static char* get_next_comma(char* string, BOOL fullquoted)
{
  const char* log = string;
  int quoted = 0;
  BOOL first = TRUE;
 
  WINPR_ASSERT(string);
 
  while (TRUE)
  {
    switch (*string)
    {
      case '\0':
        if (quoted != 0)
          WLog_ERR(TAG, "Invalid quoted argument '%s'", log);
        return NULL;
 
      case '\'':
      case '"':
        if (!fullquoted)
        {
          int now = is_quoted(*string);
          if ((quoted == 0) && !first)
          {
            WLog_ERR(TAG, "Invalid quoted argument '%s'", log);
            return NULL;
          }
          if (now == quoted)
            quoted = 0;
          else if (quoted == 0)
            quoted = now;
        }
        break;
 
      case ',':
        if (first)
        {
          WLog_ERR(TAG, "Invalid argument (empty list elements) '%s'", log);
          return NULL;
        }
        if (quoted == 0)
          return string;
        break;
 
      default:
        break;
    }
    first = FALSE;
    string++;
  }
 
  return NULL;
}
 
static BOOL is_valid_fullquoted(const char* string)
{
  char cur = '\0';
  char last = '\0';
  const char quote = *string++;
 
  /* We did not start with a quote. */
  if (is_quoted(quote) == 0)
    return FALSE;
 
  while ((cur = *string++) != '\0')
  {
    /* A quote is found. */
    if (cur == quote)
    {
      /* If the quote was escaped, it is valid. */
      if (last != '\\')
      {
        /* Only allow unescaped quote as last character in string. */
        if (*string != '\0')
          return FALSE;
      }
      /* If the last quote in the string is escaped, it is wrong. */
      else if (*string != '\0')
        return FALSE;
    }
    last = cur;
  }
 
  /* The string did not terminate with the same quote as it started. */
  if (last != quote)
    return FALSE;
  return TRUE;
}
 
char** CommandLineParseCommaSeparatedValuesEx(const char* name, const char* list, size_t* count)
{
  char** p = NULL;
  char* str = NULL;
  size_t nArgs = 0;
  size_t prefix = 0;
  size_t len = 0;
  size_t namelen = 0;
  BOOL failed = FALSE;
  char* copy = NULL;
  char* unquoted = NULL;
  BOOL fullquoted = FALSE;
 
  BOOL success = FALSE;
  if (count == NULL)
    goto fail;
 
  *count = 0;
  if (list)
  {
    int start = 0;
    int end = 0;
    unquoted = copy = _strdup(list);
    if (!copy)
      goto fail;
 
    len = strlen(unquoted);
    if (len > 0)
    {
      start = is_quoted(unquoted[0]);
      end = is_quoted(unquoted[len - 1]);
 
      if ((start != 0) && (end != 0))
      {
        if (start != end)
        {
          WLog_ERR(TAG, "invalid argument (quote mismatch) '%s'", list);
          goto fail;
        }
        if (!is_valid_fullquoted(unquoted))
          goto fail;
        unquoted[len - 1] = '\0';
        unquoted++;
        len -= 2;
        fullquoted = TRUE;
      }
    }
  }
 
  *count = get_element_count(unquoted, &failed, fullquoted);
  if (failed)
    goto fail;
 
  if (*count == 0)
  {
    if (!name)
      goto fail;
    else
    {
      size_t clen = strlen(name);
      p = (char**)calloc(2UL + clen, sizeof(char*));
 
      if (p)
      {
        char* dst = (char*)&p[1];
        p[0] = dst;
        (void)sprintf_s(dst, clen + 1, "%s", name);
        *count = 1;
        success = TRUE;
        goto fail;
      }
    }
  }
 
  nArgs = *count;
 
  if (name)
    nArgs++;
 
  prefix = (nArgs + 1UL) * sizeof(char*);
  if (name)
    namelen = strlen(name);
  p = (char**)calloc(len + prefix + 1 + namelen + 1, sizeof(char*));
 
  if (!p)
    goto fail;
 
  str = &((char*)p)[prefix];
  memcpy(str, unquoted, len);
 
  if (name)
  {
    char* namestr = &((char*)p)[prefix + len + 1];
    memcpy(namestr, name, namelen);
 
    p[0] = namestr;
  }
 
  for (size_t index = name ? 1 : 0; index < nArgs; index++)
  {
    char* ptr = str;
    const int quote = is_quoted(*ptr);
    char* comma = get_next_comma(str, fullquoted);
 
    if ((quote != 0) && !fullquoted)
      ptr++;
 
    p[index] = ptr;
 
    if (comma)
    {
      char* last = comma - 1;
      const int lastQuote = is_quoted(*last);
 
      if (!fullquoted)
      {
        if (lastQuote != quote)
        {
          WLog_ERR(TAG, "invalid argument (quote mismatch) '%s'", list);
          goto fail;
        }
        else if (lastQuote != 0)
          *last = '\0';
      }
      *comma = '\0';
 
      str = comma + 1;
    }
    else if (quote)
    {
      char* end = strrchr(ptr, '"');
      if (!end)
        goto fail;
      *end = '\0';
    }
  }
 
  *count = nArgs;
  success = TRUE;
fail:
  free(copy);
  if (!success)
  {
    if (count)
      *count = 0;
    free((void*)p);
    return NULL;
  }
  return p;
}
 
char** CommandLineParseCommaSeparatedValues(const char* list, size_t* count)
{
  return CommandLineParseCommaSeparatedValuesEx(NULL, list, count);
}
 
char* CommandLineToCommaSeparatedValues(int argc, char* argv[])
{
  return CommandLineToCommaSeparatedValuesEx(argc, argv, NULL, 0);
}
 
static const char* filtered(const char* arg, const char* filters[], size_t number)
{
  if (number == 0)
    return arg;
  for (size_t x = 0; x < number; x++)
  {
    const char* filter = filters[x];
    size_t len = strlen(filter);
    if (_strnicmp(arg, filter, len) == 0)
      return &arg[len];
  }
  return NULL;
}
 
char* CommandLineToCommaSeparatedValuesEx(int argc, char* argv[], const char* filters[],
                                          size_t number)
{
  char* str = NULL;
  size_t offset = 0;
  size_t size = WINPR_ASSERTING_INT_CAST(size_t, argc) + 1;
  if ((argc <= 0) || !argv)
    return NULL;
 
  for (int x = 0; x < argc; x++)
    size += strlen(argv[x]);
 
  str = calloc(size, sizeof(char));
  if (!str)
    return NULL;
  for (int x = 0; x < argc; x++)
  {
    int rc = 0;
    const char* arg = filtered(argv[x], filters, number);
    if (!arg)
      continue;
    rc = _snprintf(&str[offset], size - offset, "%s,", arg);
    if (rc <= 0)
    {
      free(str);
      return NULL;
    }
    offset += (size_t)rc;
  }
  if (offset > 0)
    str[offset - 1] = '\0';
  return str;
}
 
void CommandLineParserFree(char** ptr)
{
  union
  {
    char* p;
    char** pp;
  } uptr;
  uptr.pp = ptr;
  free(uptr.p);
}