gopher/gopher.c

#pragma optimize 79
#pragma noroot

#include <Memory.h>
#include <MiscTool.h>
#include <tcpip.h>

#include "url.h"
#include "connection.h"
#include "readline2.h"

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>

#include <unistd.h>

#include "s16debug.h"


extern int setfiletype(const char *filename);

/*
 * connect gopher.floodgap.com:70
 * send path
 * read output.
 * text -- ends with . <CR><LF>
 * bin  -- ends when connection is closed.
 */



static int gopher_binary(Word ipid, FILE *file)
{
  // gopher binary support.
  // format: raw data until eof.
  Word rv = 0;

  for(;;)
  { 
    static char buffer[512];
    rrBuff rb;
    Word count;

    TCPIPPoll();
    rv = TCPIPReadTCP(ipid, 0, (Ref)buffer, 512, &rb);

    count = rb.rrBuffCount;
    if (rv == 0 && count == 0) continue;

    if (rv && !count) break;

    if (!count) continue;
    fwrite(buffer, 1, count, file);

  }
 
  return rv;
}

static int gopher_text(Word ipid, FILE *file)
{
  // text \r\n
  // ...
  // . \r\n
  // any leading '.' must be doubled.

  Word eof = 0;
  int rv = 0;
  Word lastTerm = 0;

  TCPIPPoll();

  for(;;)
  { 
    Word count;
    Handle h;

    rlBuffer rb;

    rv = ReadLine2(ipid, &rb);

    h = rb.bufferHandle;
    count = rb.bufferSize;

    if (rv < 0) break; // eof
    if (rv == 0)  // no data available (yet)
    {
      TCPIPPoll();
      continue;
    }

    if (!rb.moreFlag) TCPIPPoll();

    if (count == 0)
    {
      DisposeHandle(h);
      if (rb.terminator)
      {
        if (lastTerm == '\r' && rb.terminator == '\n')
        {
            lastTerm = TERMINATOR_CR_LF;
        }
        else 
            fputc('\r', file);
      }

      lastTerm = rb.terminator;
      continue;
    }

    if (count)
    {
      char *cp;

      HLock(h);
      cp = *((char **)h);

      // .. -> . 
      // . \r\n -> eof

      if (*cp == '.')
      {
        if (count == 1)
        {
          DisposeHandle(h);
          eof = 1;
          break;
        }

        cp++;
        count--;
      }

      fwrite(cp, 1, count, file);
      fputc('\r', file);
    }

    DisposeHandle(h);
  }

  if (!eof)
    fprintf(stderr, "Warning: eof not found.\n");

  return eof ? 0 : -1;
}

static int gopher_dir(Word ipid, FILE *file)
{
  Word eof = 0;
  int rv = 0;

  TCPIPPoll();


  // blank lines are ignored, so no need to check for terminator split.
  
  for(;;)
  {
    rlBuffer rb;
    Word count;
    Handle h;


    rv = ReadLine2(ipid, &rb);

    h = rb.bufferHandle;
    count = rb.bufferSize;

    if (rv < 0) break;
    if (rv == 0)
    {
      TCPIPPoll();
      continue;
    }
    if (!rb.moreFlag) TCPIPPoll();
 

    if (!count) 
    {
      // blank line?
      continue; 
    }

    if (count)
    {

      Word tabs[4];
      unsigned i,j;
      char type;
      char *buffer;

      HLock(h);
      buffer = *((char **)h);
     
      type = *buffer;
      ++buffer;
      --count;

      if (type == '.' && count == 0)
      {
        eof = 1;
        DisposeHandle(h);
        break;
      }

      // format is [type][name] \t [path] \t [server] \t [port]
      j = 1;
      tabs[0] = 0;
      tabs[1] = tabs[2] = tabs[3] = -1;

      for (i = 0; i < count; ++i)
      {
        if (buffer[i] == '\t')
        {
          tabs[j++] = i;
          buffer[i] = 0;
          if (j == 4) break;
        }
      }
      
      // 'i' is info record.
      if (type == 'i')
      {
        if (tabs[1] == -1)
          fwrite(buffer, 1, count, file);
        else 
          fputs(buffer, file);

        fputc('\r', file);
      }
      else if (j == 4) // all the tabs.
      {
        int port = 0;
        // description
        // file name
        // server
        // port
        for (i = tabs[3] + 1; i < count; ++i)
        {
          char c = buffer[i];
          if (c >= '0' && c <= '9') port = port * 10 + c - '0';
        }

        if (port == 70) 
        {
          fprintf(file, "[%s/%c%s]  %s\r",
            buffer + 1 + tabs[2], // server
            type, // type
            buffer + 1 + tabs[1], // file name
            buffer // description
          );
        }
        else
        {
          fprintf(file, "[%s:%u/%c%s]  %s\r",
            buffer + 1 + tabs[2], // server
            port, // port
            type, // type
            buffer + 1 + tabs[1], // file name
            buffer // description
          );
        }

      }
      
      DisposeHandle(h);
    }
  }

  if (!eof)
    fprintf(stderr, "Warning: eof not found.\n");

  return eof ? 0 : -1;
}

void do_gopher(const char *url, URLComponents *components, FILE *file)
{
  Connection buffer;
  char *host;
  char type;
  
  LongWord qtick;

  if (!components->portNumber) components->portNumber = 70;
  
  host = malloc(components->host.length + 1);
  URLComponentGetC(url, components, URLComponentHost, host);

  ConnectionInit(&buffer, MMStartUp());
  
  ConnectionOpenC(&buffer, host,  components->portNumber);

  // 30 second timeout.
  qtick = GetTick() + 30 * 60;
  while (!ConnectionPoll(&buffer))
  {
    if (GetTick() >= qtick)
    {
      fprintf(stderr, "Connection timed out.\n");
      // todo -- still need to close it...
      free(host);
      return;
    }
  }
  
  //s16_debug_tcp(buffer.ipid);

  if (buffer.state == kConnectionStateError 
    || buffer.state == kConnectionStateDisconnected)
  {
    fprintf(stderr, "Unable to open host: %s:%u\n", 
      host, 
      components->portNumber);
    free(host);
    return;
  }

  // connected....
  
  // path is /[type][resource]
  // where [type] is 1 char and the leading / is ignored.
  
  if (components->path.length <= 1)
  {
    // / or blank
    type = '1'; // directory
  }
  else if (components->path.length == 2)
  {
    // / type
    // invalid -- treat as /
    type = '1';
  }
  else
  {
    type = url[components->path.location+1];
    TCPIPWriteTCP(
      buffer.ipid, 
      url + components->path.location + 2, 
      components->path.length - 2,
      0,
      0);
  }
  // 
  TCPIPWriteTCP(buffer.ipid, "\r\n", 2, true, 0);

  // 5 and 9 are binary, 1 is dir, all others text.

  switch(type)
  {
  case '1':
    gopher_dir(buffer.ipid, file);
    break;
  case '5':
  case '9':
    fsetbinary(file);
    gopher_binary(buffer.ipid, file);
    break;
  default:
    gopher_text(buffer.ipid, file);
    break;
  }

  fflush(file);

  ConnectionClose(&buffer);

  while (!ConnectionPoll(&buffer)) ; // wait for it to close.

  free (host);
}