static void
next_token (scanner_t *scanner)
{
int start, end, type;
char c;
skip_spaces (scanner);
start = scanner->idx;
while (!is_eof (scanner) && !isspace (CUR_CHAR)) {
if (scanner->idx == start) {
if (is_special_char (CUR_CHAR)) {
++scanner->idx;
break;
}
} else if (is_special_char (CUR_CHAR))
break;
++scanner->idx;
}
end = scanner->idx;
c = scanner->input [start];
if (start >= scanner->size)
type = TOKEN_EOF;
else if (isdigit (c) || c == '\'')
type = TOKEN_NUM;
else if (ispunct_char (c))
type = TOKEN_PUNC;
else
type = TOKEN_ID;
scanner->current.start = start;
scanner->current.end = end;
scanner->current.type = type;
scanner->current.line = scanner->line;
DEBUG_SCANNER (dump_token (scanner, &scanner->current));
}
HttpParams::HttpParams(char* p): params(p), len(0), n(0) {
// first, decode any unnecessary encodings
char* dest = p;
if(params) {
for(const char* src = params; *src; src++) {
if(is_valid_url_char(*src) || is_special_char(*src)) {
*dest++ = *src;
} else if('%'==*src) {
char hex = 0;
for(int i=0; i<2; i++) {
hex <<= 4;
if(!to_hex(*++src,hex))
goto abort;
}
if(is_valid_url_char(hex)) {
*dest++ = hex;
} else { // revert it
*dest++ = '%';
*dest++ = src[-1];
*dest++ = *src;
}
} else
goto abort;
}
}
if(!params) {
static char empty = '\0';
abort: params=∅
dest=p;
}
// put all the counters at the end
k = v = len = (dest-p);
}
string sinsp_filter::next_operand(bool expecting_first_operand)
{
int32_t start;
//
// Skip spaces
//
if(isblank(m_fltstr[m_scanpos]))
{
next();
}
//
// Mark the beginning of the word
//
start = m_scanpos;
for(; m_scanpos < m_scansize; m_scanpos++)
{
char curchar = m_fltstr[m_scanpos];
bool is_end_of_word;
if(expecting_first_operand)
{
is_end_of_word = (isblank(curchar) || is_special_char(curchar));
}
else
{
is_end_of_word = (isblank(curchar) || is_bracket(curchar));
}
if(is_end_of_word)
{
//
// End of word
//
ASSERT(m_scanpos > start);
string res = m_fltstr.substr(start, m_scanpos - start);
if(curchar == '(' || curchar == ')')
{
m_scanpos--;
}
return res;
}
}
//
// End of filter
//
return m_fltstr.substr(start, m_scansize - 1);
}
// Read the next line and return it as a list of tokens skipping white space and special characters
// The return value indicates success/failure.
bool read_line_as_tokens (istream& is, vector<string>& tokens,
bool includeSpecialChars = false) {
tokens.clear() ;
string line ;
std::getline (is, line) ;
while (is && tokens.empty()) {
string token = "" ;
for (int i=0; i < line.size(); ++i) {
char currChar = line[i] ;
bool isSpecialChar = is_special_char(currChar) ;
if (std::isspace (currChar) || isSpecialChar) {
if (!token.empty()) {
// Add the current token to the list of tokens
tokens.push_back(token) ;
token.clear() ;
}
if (includeSpecialChars && isSpecialChar) {
tokens.push_back(string(1, currChar)) ;
}
} else {
// Add the char to the current token
token.push_back(currChar) ;
}
}
if (!token.empty())
tokens.push_back(token) ;
if (tokens.empty())
// Previous line read was empty. Read the next one.
std::getline (is, line) ;
}
//for (int i=0; i < tokens.size(); ++i)
// cout << tokens[i] << " " ;
//cout << endl ;
return !tokens.empty() ;
}
vector<char> sinsp_filter::next_operand(bool expecting_first_operand)
{
vector<char> res;
bool is_quoted = false;
int32_t start;
int32_t nums[2];
uint32_t num_pos;
enum ppm_escape_state
{
PES_NORMAL,
PES_SLASH,
PES_NUMBER,
PES_ERROR,
} escape_state;
//
// Skip spaces
//
if(isblank(m_fltstr[m_scanpos]))
{
next();
}
//
// If there are quotes, don't stop on blank
//
if(m_scanpos < m_scansize &&
(m_fltstr[m_scanpos] == '"' || m_fltstr[m_scanpos] == '\''))
{
is_quoted = true;
m_scanpos++;
}
//
// Mark the beginning of the word
//
start = m_scanpos;
escape_state = PES_NORMAL;
num_pos = 0;
while(m_scanpos < m_scansize && escape_state != PES_ERROR)
{
char curchar = m_fltstr[m_scanpos];
bool is_end_of_word;
if(expecting_first_operand)
{
is_end_of_word = (isblank(curchar) || is_special_char(curchar));
}
else
{
is_end_of_word = (!is_quoted && (isblank(curchar) || is_bracket(curchar))) ||
(is_quoted && escape_state != PES_SLASH && (curchar == '"' || curchar == '\''));
}
if(is_end_of_word)
{
if(escape_state != PES_NORMAL)
{
escape_state = PES_ERROR;
break;
}
//
// End of word
//
ASSERT(m_scanpos > start);
if(curchar == '(' || curchar == ')')
{
m_scanpos--;
}
res.push_back('\0');
return res;
}
switch(escape_state)
{
case PES_NORMAL:
if(curchar == '\\' && !expecting_first_operand)
{
escape_state = PES_SLASH;
}
else
{
res.push_back(curchar);
}
break;
case PES_SLASH:
switch(curchar)
{
case '\\':
case '"':
escape_state = PES_NORMAL;
res.push_back(curchar);
break;
case 'x':
escape_state = PES_NUMBER;
break;
default:
escape_state = PES_ERROR;
break;
}
break;
case PES_NUMBER:
if(isdigit((int)curchar))
{
nums[num_pos++] = curchar - '0';
}
else if((curchar >= 'a' && curchar <= 'f') || (curchar >= 'A' && curchar <= 'F'))
{
nums[num_pos++] = tolower((int)curchar) - 'a' + 10;
}
else
{
escape_state = PES_ERROR;
}
if(num_pos == 2 && escape_state != PES_ERROR)
{
res.push_back((char)(nums[0] * 16 + nums[1]));
num_pos = 0;
escape_state = PES_NORMAL;
}
break;
default:
ASSERT(false);
escape_state = PES_ERROR;
break;
}
m_scanpos++;
}
if(escape_state == PES_ERROR)
{
throw sinsp_exception("filter error: unrecognized escape sequence at " + m_fltstr.substr(start, m_scanpos));
}
else if(is_quoted)
{
throw sinsp_exception("filter error: unclosed quotes");
}
//
// End of filter
//
res.push_back('\0');
return res;
}
bool ws::http_request_parser::is_valid_header_name_char(char c)
{
return (!is_special_char(c) && is_ascii_non_ctl(c));
}
command_t
read_command_stream (command_stream_t s)
{
/*
take a command stream, return a command_t object to be used
by main.c
Read a command from STREAM; return it, or NULL on EOF. If there is`
an error, report the error and exit instead of returning.
Given: array of pointers to c strings (command_stream)
Output: singular constructed command objects such that
when read_command_stream is called one command
object is returned, and the next time it is
called the second command object is returned, etc. command
object is returned, and the next time
*/
int index = s->cmd_count;
int list_size = s->size;
struct command* cmd_ptr = NULL;
struct command* special_ptr = NULL;
struct command* outer_special_ptr = NULL;
char ** word_list = NULL;
int word_list_size = 0;
char dir = 'l';
char outside_dir = 'l';
bool found_start_subshell = false;
if (index > list_size-1)
return NULL;
// Skip repeating \n's
if (strcmp(s->command_list[index], "\n") == 0 && cmd_ptr == NULL) {
while ( strcmp(s->command_list[index], "\n") == 0 )
{
index++;
s->line_count++;
if (index > list_size-1)
return NULL;
}
}
//short loop_iteration = 0;
while ( strcmp(s->command_list[index], "\n") != 0)
{
// printf("Iteration: %d\n", loop_iteration++);
// Syntax Check
if (!is_valid_char(s->command_list[index]))
{
syn_error(s);
}
// For ooerators
if(is_special_char(s->command_list[index]))
{
if(strcmp(s->command_list[index], "(") == 0)
{
found_start_subshell = true;
if(word_list_size !=0 && word_list != NULL && special_ptr==NULL)
syn_error(s);
outer_special_ptr = special_ptr;
special_ptr = NULL;
outside_dir = dir;
dir = 'l';
}
else if(strcmp(s->command_list[index], ")")==0)
{
if(found_start_subshell)
{
found_start_subshell = false;
}
else
{
syn_error(s);
}
if(!build_word_command(word_list, &cmd_ptr))
{
syn_error(s);
}
word_list = NULL;
word_list_size = 0;
//if there is a special command
if(special_ptr != NULL)
{
if(!add_cmd_to_special(&cmd_ptr, &special_ptr, 'r'))
syn_error(s);
cmd_ptr = special_ptr;
}
if(!build_sub_command(&cmd_ptr, &special_ptr))
syn_error(s);
cmd_ptr = special_ptr;
special_ptr = outer_special_ptr;
dir = outside_dir;
// printf("I came here!\n");
}
//check first for redirection special chars
else if(strcmp(s->command_list[index], "<") == 0)
{
if (word_list != NULL)
{
if (!build_word_command(word_list, &cmd_ptr))
syn_error(s);
word_list = NULL;
word_list_size = 0;
}
//if the next command = special char output an error
if(index+1 < list_size)
{
if(is_special_char(s->command_list[index+1]) ||
strcmp(s->command_list[index+1], "\n") == 0)
{
syn_error(s);
}
//else output an error
if(!add_word_to_IO(s->command_list[index+1], &cmd_ptr, 'i'))
{
syn_error(s);
}
}
//increment index an additional time because
//command for index+1 is already constructed
index++;
}
else if(strcmp(s->command_list[index], ">") ==0)
{
if (word_list != NULL)
{
if (!build_word_command(word_list, &cmd_ptr))
syn_error(s);
word_list = NULL;
word_list_size = 0;
}
if(index+1 < list_size)//check condition later
{
if(is_special_char(s->command_list[index+1]) ||
strcmp(s->command_list[index+1], "\n") == 0)
syn_error(s);
if(!add_word_to_IO(s->command_list[index+1], &cmd_ptr, 'o'))
syn_error(s);
}
index++;
}
//else condition: not "<" or ">" so implement l and r ptrs
// Add to left only in first iteration
else if(dir == 'l')
{
if (word_list != NULL)
{
if (!build_word_command(word_list, &cmd_ptr))
syn_error(s);
word_list = NULL;
word_list_size = 0;
}
if (!build_special_command(s->command_list[index], &special_ptr))
syn_error(s);
if (!add_cmd_to_special(&cmd_ptr,&special_ptr, 'l'))
syn_error(s);
cmd_ptr = NULL;
dir = 'r';
}
// Add to further special commands
else
{
if (word_list != NULL)
{
if (!build_word_command(word_list, &cmd_ptr))
syn_error(s);
word_list = NULL;
word_list_size = 0;
}
if (!add_cmd_to_special(&cmd_ptr,&special_ptr,'r'))
syn_error(s);
cmd_ptr = special_ptr;
special_ptr = NULL;
if (!build_special_command(s->command_list[index], &special_ptr))
syn_error(s);
if (!add_cmd_to_special(&cmd_ptr,&special_ptr,'l'))
syn_error(s);
}
// printf("i made it this far\n");
//solves "dangling \n" problem
if ( index+2 < list_size)
{
if(strcmp(s->command_list[index+1], "\n") == 0 && special_ptr != NULL)
{
index++;
}
}
}
// For Single Words
else
{
// Append to word_list before making commands
if(!add_cmd_to_list(s->command_list[index], &word_list, word_list_size))
syn_error(s);
// printf("Added command %s to position %d\n", s->command_list[index], word_list_size);
word_list_size++;
}
index++;
}
s->cmd_count = index + 1;
// Fix case for single sided sequence commands
if (special_ptr != NULL)
{
if (special_ptr->type == SEQUENCE_COMMAND && special_ptr->u.command[1] == NULL)
{
add_cmd_to_list(" ", &word_list, word_list_size);
}
}
// Build remaining list
if (cmd_ptr == NULL)
{
if (!build_word_command(word_list, &cmd_ptr))
syn_error(s);
// int i;
// for(i = 0; i< word_list_size; i++)
// {
// printf("adding to cmd word %s\n", word_list[i]);
// }
word_list_size = 0;
word_list = NULL;
}
if(found_start_subshell)
syn_error(s);
// If reaming word_list commands and incomplete tree
if (special_ptr != NULL)
{
if(!add_cmd_to_special(&cmd_ptr, &special_ptr, 'r'))
syn_error(s);
cmd_ptr = special_ptr;
}
//printf("I made it this far!");
// Increment line count
s->line_count++;
return cmd_ptr;
}
void wr_val(char x)
{
if(is_special_char(x))
wr_translated(x);
else out << x;
}
