gopher/gopher.c
2012-04-24 23:54:46 -04:00

379 lines
6.3 KiB
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);
}