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//
// fd_passing_stream_server.cpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2024 Christopher M. Kohlhoff (chris at kohlhoff dot com)
// Copyright (c) 2021 Heiko Hund (heiko at openvpn dot net)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

// Demonstrates how to pass file descriptors between processes with Asio.
// The client sends a file name to the server. The server opens the file and
// passes the associated file descriptor back to the client.

#include <array>
#include <cstdio>
#include <cassert>
#include <iostream>
#include <memory>
#include "asio.hpp"

#if defined(ASIO_HAS_LOCAL_SOCKETS)

using asio::local::stream_protocol;

class session
  : public std::enable_shared_from_this<session>
{
public:
  session(stream_protocol::socket sock)
    : socket_(std::move(sock))
  {
  }

  void start()
  {
    do_read();
  }

private:
  void do_read()
  {
    auto self(shared_from_this());
    socket_.async_read_some(asio::buffer(data_),
        [this, self](std::error_code ec, std::size_t length)
        {
          if (ec)
            return;

          assert(length < data_.size());
          data_[length] = 0;
          do_write(data_.data());
        });
  }

  void do_write(const char* filename)
  {
    auto self(shared_from_this());
    socket_.async_wait(stream_protocol::socket::wait_write,
        [this, self, filename](std::error_code ec)
        {
          if (ec)
            return;

          FILE* f(::fopen(filename, "w+"));
          if (!f)
            return;

          struct msghdr msg = {};
          char buf[] = { 0 };
          struct iovec iov = { buf, sizeof(buf) };
          msg.msg_iov = &iov;
          msg.msg_iovlen = 1;

          union
          {
            struct cmsghdr align;
            char buf[CMSG_SPACE(sizeof(int))];
          } cmsgu;
          msg.msg_control = cmsgu.buf;
          msg.msg_controllen = sizeof(cmsgu.buf);

          struct cmsghdr* cmsg = CMSG_FIRSTHDR(&msg);
          cmsg->cmsg_len = CMSG_LEN(sizeof(int));
          cmsg->cmsg_level = SOL_SOCKET;
          cmsg->cmsg_type = SCM_RIGHTS;
          int fd = ::fileno(f);
          std::memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));

          ssize_t s(::sendmsg(socket_.native_handle(), &msg, 0));
          ::fclose(f);
          if (s != -1)
            do_read();
        });
  }

  // The socket used to communicate with the client.
  stream_protocol::socket socket_;

  // Buffer used to store data received from the client.
  std::array<char, 1024> data_;
};

class server
{
public:
  server(asio::io_context& io_context, const std::string& file)
    : acceptor_(io_context, stream_protocol::endpoint(file))
  {
    do_accept();
  }

private:
  void do_accept()
  {
    acceptor_.async_accept(
        [this](std::error_code ec, stream_protocol::socket socket)
        {
          if (!ec)
          {
            std::make_shared<session>(std::move(socket))->start();
          }

          do_accept();
        });
  }

  stream_protocol::acceptor acceptor_;
};

int main(int argc, char* argv[])
{
  try
  {
    if (argc != 2)
    {
      std::cerr << "Usage: fd_passing_stream_server <socketfile>\n";
      std::cerr << "*** WARNING: existing file is removed ***\n";
      return 1;
    }

    asio::io_context io_context;

    std::remove(argv[1]);
    server s(io_context, argv[1]);

    io_context.run();
  }
  catch (std::exception& e)
  {
    std::cerr << "Exception: " << e.what() << "\n";
  }

  return 0;
}

#else // defined(ASIO_HAS_LOCAL_SOCKETS)
# error Local sockets not available on this platform.
#endif // defined(ASIO_HAS_LOCAL_SOCKETS)
="o">*cursrc, const UINT8 *srcend, parse_info *pinfo) { /* switch off of the field type */ switch (*cursrc) { case 'Q': cursrc++; switch (*cursrc) { /* number of fuses */ case 'F': cursrc++; pinfo->explicit_numfuses = data->numfuses = suck_number(&cursrc); break; } break; /* default fuse state (0 or 1) */ case 'F': cursrc++; if (LOG_PARSE) printf("F%c\n", *cursrc); if (*cursrc == '0') memset(data->fusemap, 0x00, sizeof(data->fusemap)); else memset(data->fusemap, 0xff, sizeof(data->fusemap)); break; /* fuse states */ case 'L': { UINT32 curfuse; /* read the fuse number */ cursrc++; curfuse = suck_number(&cursrc); if (LOG_PARSE) printf("L%u\n", curfuse); /* read digits, skipping delimiters */ for ( ; cursrc < srcend; cursrc++) if (*cursrc == '0' || *cursrc == '1') { jed_set_fuse(data, curfuse, *cursrc - '0'); if (LOG_PARSE) printf(" fuse %u = %d\n", curfuse, 0); if (curfuse >= data->numfuses) data->numfuses = curfuse + 1; curfuse++; } break; } /* fuse checksum */ case 'C': cursrc++; if (cursrc < srcend + 4 && ishex(cursrc[0]) && ishex(cursrc[1]) && ishex(cursrc[2]) && ishex(cursrc[3])) { pinfo->checksum = 0; while (ishex(*cursrc) && cursrc < srcend) pinfo->checksum = (pinfo->checksum << 4) | hexval(*cursrc++); } break; } } /*------------------------------------------------- jed_parse - parse a .JED file that has been loaded raw into memory -------------------------------------------------*/ int jed_parse(const void *data, size_t length, jed_data *result) { const UINT8 *cursrc = (const UINT8 *)data; const UINT8 *srcend = cursrc + length; const UINT8 *scan; parse_info pinfo; UINT16 checksum; int i; /* initialize the output and the intermediate info struct */ memset(result, 0, sizeof(*result)); memset(&pinfo, 0, sizeof(pinfo)); /* first scan for the STX character; ignore anything prior */ while (cursrc < srcend && *cursrc != 0x02) cursrc++; if (cursrc >= srcend) return JEDERR_INVALID_DATA; /* then scan to see if we have an ETX */ scan = cursrc; checksum = 0; while (scan < srcend && *scan != 0x03) checksum += *scan++ & 0x7f; if (scan >= srcend) return JEDERR_INVALID_DATA; /* see if there is a transmission checksum at the end */ checksum += *scan; if (scan + 4 < srcend && ishex(scan[1]) && ishex(scan[2]) && ishex(scan[3]) && ishex(scan[4])) { UINT16 dessum = (hexval(scan[1]) << 12) | (hexval(scan[2]) << 8) | (hexval(scan[3]) << 4) | hexval(scan[4] << 0); if (dessum != 0 && dessum != checksum) return JEDERR_BAD_XMIT_SUM; } /* the ETX becomes the real srcend */ srcend = scan; /* blast through the comment field */ cursrc++; while (cursrc < srcend && *cursrc != '*') cursrc++; /* now loop over fields and decide which ones go in the file output */ cursrc++; while (cursrc < srcend) { /* skip over delimiters */ while (cursrc < srcend && isdelim(*cursrc)) cursrc++; if (cursrc >= srcend) break; /* end of field is an asterisk -- find it */ scan = cursrc; while (scan < srcend && *scan != '*') scan++; if (scan >= srcend) return JEDERR_INVALID_DATA; /* process the field */ process_field(result, cursrc, scan, &pinfo); /* advance past it */ cursrc = scan + 1; } /* if we got an explicit fuse count, override our computed count */ if (pinfo.explicit_numfuses != 0) result->numfuses = pinfo.explicit_numfuses; /* clear out leftover bits */ if (result->numfuses % 8 != 0) result->fusemap[result->numfuses / 8] &= (1 << (result->numfuses % 8)) - 1; memset(&result->fusemap[(result->numfuses + 7) / 8], 0, sizeof(result->fusemap) - (result->numfuses + 7) / 8); /* validate the checksum */ checksum = 0; for (i = 0; i < (result->numfuses + 7) / 8; i++) checksum += result->fusemap[i]; if (pinfo.checksum != 0 && checksum != pinfo.checksum) return JEDERR_BAD_FUSE_SUM; return JEDERR_NONE; } /*------------------------------------------------- jed_output - generate a new .JED file based on the jed_data provided -------------------------------------------------*/ size_t jed_output(const jed_data *data, void *result, size_t length) { UINT8 *curdst = (UINT8 *)result; UINT8 *dstend = curdst + length; int i, zeros, ones; char tempbuf[256]; UINT16 checksum; UINT8 defbyte; UINT8 *temp; /* always start the DST with a standard header and an STX */ tempbuf[0] = 0x02; sprintf(&tempbuf[1], "JEDEC file generated by jedutil*\n"); if (curdst + strlen(tempbuf) <= dstend) memcpy(curdst, tempbuf, strlen(tempbuf)); curdst += strlen(tempbuf); /* append the package information */ sprintf(tempbuf, "QF%d*\n", data->numfuses); if (curdst + strlen(tempbuf) <= dstend) memcpy(curdst, tempbuf, strlen(tempbuf)); curdst += strlen(tempbuf); /* compute the checksum */ checksum = 0; for (i = 0; i < data->numfuses / 8; i++) checksum += data->fusemap[i]; if (data->numfuses % 8 != 0) checksum += data->fusemap[data->numfuses / 8] & ((1 << (data->numfuses % 8)) - 1); /* determine if we are mostly 0's or mostly 1's */ for (i = zeros = ones = 0; i < data->numfuses / 8; i++) if (data->fusemap[i] == 0x00) zeros++; else if (data->fusemap[i] == 0xff) ones++; defbyte = (ones > zeros) ? 0xff : 0x00; /* output the default fuse state */ sprintf(tempbuf, "F%d*\n", defbyte & 1); if (curdst + strlen(tempbuf) <= dstend) memcpy(curdst, tempbuf, strlen(tempbuf)); curdst += strlen(tempbuf); /* now loop over groups of 32 fuses and output non-default groups */ for (i = 0; i < data->numfuses; i += 32) if (data->fusemap[i / 8 + 0] != defbyte || data->fusemap[i / 8 + 1] != defbyte || data->fusemap[i / 8 + 2] != defbyte || data->fusemap[i / 8 + 3] != defbyte) { int stroffs; int j; /* build up a string of 32 fuses */ stroffs = sprintf(tempbuf, "L%05d ", i); for (j = 0; j < 32 && i+j < data->numfuses; j++) tempbuf[stroffs++] = '0' + jed_get_fuse(data, i + j); stroffs += sprintf(&tempbuf[stroffs], "*\n"); /* append to the buffer */ if (curdst + strlen(tempbuf) <= dstend) memcpy(curdst, tempbuf, strlen(tempbuf)); curdst += strlen(tempbuf); } /* write the checksum */ sprintf(tempbuf, "C%04X*\n", checksum); if (curdst + strlen(tempbuf) <= dstend) memcpy(curdst, tempbuf, strlen(tempbuf)); curdst += strlen(tempbuf); /* now compute the transmission checksum */ checksum = 0; for (temp = (UINT8 *)result; temp < curdst && temp < dstend; temp++) checksum += *temp & 0x7f; checksum += 0x03; /* append the ETX and the transmission checksum */ tempbuf[0] = 0x03; sprintf(&tempbuf[1], "%04X", checksum); if (curdst + strlen(tempbuf) <= dstend) memcpy(curdst, tempbuf, strlen(tempbuf)); curdst += strlen(tempbuf); /* return the final size */ return curdst - (UINT8 *)result; } /*------------------------------------------------- jedbin_parse - parse a binary JED file that has been loaded raw into memory -------------------------------------------------*/ int jedbin_parse(const void *data, size_t length, jed_data *result) { const UINT8 *cursrc = (const UINT8 *)data; /* initialize the output */ memset(result, 0, sizeof(*result)); /* need at least 4 bytes */ if (length < 4) return JEDERR_INVALID_DATA; /* first unpack the number of fuses */ result->numfuses = (cursrc[0] << 24) | (cursrc[1] << 16) | (cursrc[2] << 8) | cursrc[3]; cursrc += 4; if (result->numfuses == 0 || result->numfuses > JED_MAX_FUSES) return JEDERR_INVALID_DATA; /* now make sure we have enough data in the source */ if (length < 4 + (result->numfuses + 7) / 8) return JEDERR_INVALID_DATA; /* copy in the data */ memcpy(result->fusemap, cursrc, (result->numfuses + 7) / 8); return JEDERR_NONE; } /*------------------------------------------------- jedbin_output - generate a new binary JED file based on the jed_data provided -------------------------------------------------*/ size_t jedbin_output(const jed_data *data, void *result, size_t length) { UINT8 *curdst = (UINT8 *)result; /* ensure we have enough room */ if (length >= 4 + (data->numfuses + 7) / 8) { /* store the number of fuses */ *curdst++ = data->numfuses >> 24; *curdst++ = data->numfuses >> 16; *curdst++ = data->numfuses >> 8; *curdst++ = data->numfuses >> 0; /* copy in the rest of the data */ memcpy(curdst, data->fusemap, (data->numfuses + 7) / 8); } /* return the final size */ return 4 + (data->numfuses + 7) / 8; }