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Fix RPC console parser to handle escaped arguments more like bash

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- Fix issue #1750
This commit is contained in:
Wladimir J. van der Laan 2012-08-30 21:42:18 +02:00
parent a65b53bf06
commit 576b5efe93
1 changed files with 98 additions and 20 deletions
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118
src/qt/rpcconsole.cpp
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@ -13,7 +13,6 @@
#include <QUrl>
#include <QScrollBar>
#include <boost/tokenizer.hpp>
#include <openssl/crypto.h>
// TODO: make it possible to filter out categories (esp debug messages when implemented)
@ -54,34 +53,113 @@ void RPCExecutor::start()
// Nothing to do
}
void RPCExecutor::request(const QString &command)
/**
* Split shell command line into a list of arguments. Aims to emulate \c bash and friends.
*
* - Arguments are delimited with whitespace
* - Extra whitespace at the beginning and end and between arguments will be ignored
* - Arguments can be "double" or 'single' quoted. Those are treated the same.
* - The backslash '\' is used as escape character
* - Outside quotes, any character can be escaped
* - Within double quotes, only escape double quotes with \" and backslashes with \\
* - Within single quotes, only escape single quotes with \' and backslashes with \\
*
* @param[out] args Parsed arguments will be appended to this list
* @param[in] strCommand Command line to split
*/
bool parseCommandLine(std::vector<std::string> &args, const std::string &strCommand)
{
// Parse shell-like command line into separate arguments
std::string strMethod;
std::vector<std::string> strParams;
try {
boost::escaped_list_separator<char> els('\\',' ','\"');
std::string strCommand = command.toStdString();
boost::tokenizer<boost::escaped_list_separator<char> > tok(strCommand, els);
int n = 0;
for(boost::tokenizer<boost::escaped_list_separator<char> >::iterator beg=tok.begin(); beg!=tok.end();++beg,++n)
enum CmdParseState
{
STATE_EATING_SPACES,
STATE_ARGUMENT,
STATE_SINGLEQUOTED,
STATE_DOUBLEQUOTED,
STATE_ESCAPE_OUTER,
STATE_ESCAPE_SINGLEQUOTED,
STATE_ESCAPE_DOUBLEQUOTED
} state = STATE_EATING_SPACES;
std::string curarg;
foreach(char ch, strCommand)
{
switch(state)
{
if(n == 0) // First parameter is the command
strMethod = *beg;
else
strParams.push_back(*beg);
case STATE_ARGUMENT: // After argument
case STATE_EATING_SPACES: // Handle runs of spaces
switch(ch)
{
case '"': state = STATE_DOUBLEQUOTED; break;
case '\'': state = STATE_SINGLEQUOTED; break;
case '\\': state = STATE_ESCAPE_OUTER; break;
case ' ': case '\n': case '\t':
if(state == STATE_ARGUMENT) // Space ends argument
{
args.push_back(curarg);
curarg.clear();
}
state = STATE_EATING_SPACES;
break;
default: curarg += ch; state = STATE_ARGUMENT;
}
break;
case STATE_SINGLEQUOTED: // Single-quoted string
switch(ch)
{
case '\'': state = STATE_ARGUMENT; break;
case '\\': state = STATE_ESCAPE_SINGLEQUOTED; break;
default: curarg += ch;
}
break;
case STATE_DOUBLEQUOTED: // Double-quoted string
switch(ch)
{
case '"': state = STATE_ARGUMENT; break;
case '\\': state = STATE_ESCAPE_DOUBLEQUOTED; break;
default: curarg += ch;
}
break;
case STATE_ESCAPE_OUTER: // '\' outside quotes
curarg += ch; state = STATE_ARGUMENT;
break;
case STATE_ESCAPE_SINGLEQUOTED: // '\' in single-quoted text
if(ch != '\'') curarg += '\\'; // keep '\' for everything but the quote
curarg += ch; state = STATE_SINGLEQUOTED;
break;
case STATE_ESCAPE_DOUBLEQUOTED: // '\' in double-quoted text
if(ch != '"') curarg += '\\'; // keep '\' for everything but the quote
curarg += ch; state = STATE_DOUBLEQUOTED;
break;
}
}
catch(boost::escaped_list_error &e)
switch(state) // final state
{
emit reply(RPCConsole::CMD_ERROR, QString("Parse error"));
case STATE_EATING_SPACES:
return true;
case STATE_ARGUMENT:
args.push_back(curarg);
return true;
default: // ERROR to end in one of the other states
return false;
}
}
void RPCExecutor::request(const QString &command)
{
std::vector<std::string> args;
if(!parseCommandLine(args, command.toStdString()))
{
emit reply(RPCConsole::CMD_ERROR, QString("Parse error: unbalanced ' or \""));
return;
}
if(args.empty())
return; // Nothing to do
try {
std::string strPrint;
json_spirit::Value result = tableRPC.execute(strMethod, RPCConvertValues(strMethod, strParams));
// Convert argument list to JSON objects in method-dependent way,
// and pass it along with the method name to the dispatcher.
json_spirit::Value result = tableRPC.execute(
args[0],
RPCConvertValues(args[0], std::vector<std::string>(args.begin() + 1, args.end())));
// Format result reply
if (result.type() == json_spirit::null_type)