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//==========================================================================
//
// net/http_client.c
//
// Stand-alone HTTP support for RedBoot
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): gthomas
// Contributors: gthomas
// Date: 2002-05-22
// Purpose:
// Description:
//
// This code is part of RedBoot (tm).
//
//####DESCRIPTIONEND####
//
//==========================================================================
// HTTP client support
#include <redboot.h> // have_net
#include <net/net.h>
#include <net/http.h>
// So we remember which ports have been used
static int get_port = 7800;
static struct _stream{
bool open;
int avail, actual_len, pos, filelen;
char data[4096];
char *bufp;
tcp_socket_t sock;
} http_stream;
static __inline__ int
min(int a, int b)
{
if (a < b)
return a;
else
return b;
}
int
http_stream_open(connection_info_t *info, int *err)
{
int res;
struct _stream *s = &http_stream;
if (!info->server->sin_port)
info->server->sin_port = 80; // HTTP port
if ((res = __tcp_open(&s->sock, info->server, get_port++, 5000, err)) < 0) {
*err = HTTP_OPEN;
return -1;
}
diag_sprintf(s->data, "GET %s HTTP/1.0\r\n\r\n", info->filename);
__tcp_write_block(&s->sock, s->data, strlen(s->data));
s->avail = 0;
s->open = true;
s->pos = 0;
return 0;
}
void
http_stream_close(int *err)
{
struct _stream *s = &http_stream;
if (s->open) {
__tcp_abort(&s->sock,1);
s->open = false;
}
}
int
http_stream_read(char *buf,
int len,
int *err)
{
struct _stream *s = &http_stream;
int total = 0;
int cnt, code;
if (!s->open) {
return -1; // Shouldn't happen, but...
}
while (len) {
while (s->avail == 0) {
// Need to wait for some data to arrive
__tcp_poll();
if (s->sock.state != _ESTABLISHED) {
if (s->sock.state == _CLOSE_WAIT) {
// This connection is breaking
if (s->sock.data_bytes == 0 && s->sock.rxcnt == 0) {
__tcp_close(&s->sock);
return total;
}
} else if (s->sock.state == _CLOSED) {
// The connection is gone
s->open = false;
return -1;
} else {
*err = HTTP_IO;
return -1;
}
}
s->actual_len = __tcp_read(&s->sock, s->data, sizeof(s->data));
if (s->actual_len > 0) {
s->bufp = s->data;
s->avail = s->actual_len;
if (s->pos == 0) {
// First data - need to scan HTTP response header
if (strncmp(s->bufp, "HTTP/", 5) == 0) {
// Should look like "HTTP/1.1 200 OK"
s->bufp += 5;
s->avail -= 5;
// Find first space
while ((s->avail > 0) && (*s->bufp != ' ')) {
s->bufp++;
s->avail--;
}
// Now the integer response
code = 0;
while ((s->avail > 0) && (*s->bufp == ' ')) {
s->bufp++;
s->avail--;
}
while ((s->avail > 0) && isdigit(*s->bufp)) {
code = (code * 10) + (*s->bufp - '0');
s->bufp++;
s->avail--;
}
// Make sure it says OK
while ((s->avail > 0) && (*s->bufp == ' ')) {
s->bufp++;
s->avail--;
}
if (strncmp(s->bufp, "OK", 2)) {
switch (code) {
case 400:
*err = HTTP_BADREQ;
break;
case 403:
*err = HTTP_FORBIDDEN;
break;
case 404:
*err = HTTP_NOFILE;
break;
default:
*err = HTTP_BADHDR;
break;
}
return -1;
}
// Find \r\n\r\n - end of HTTP preamble
while (s->avail >= 4) {
// This could be done faster, but not simpler
if (strncmp(s->bufp, "\r\n\r\n", 4) == 0) {
s->bufp += 4;
s->avail -= 4;
#if 0 // DEBUG - show header
*(s->bufp-2) = '\0';
diag_printf(s->data);
#endif
break;
}
s->avail--;
s->bufp++;
}
s->pos++;
} else {
// Unrecognized response
*err = HTTP_BADHDR;
return -1;
}
}
} else if (s->actual_len < 0) {
*err = HTTP_IO;
return -1;
}
}
cnt = min(len, s->avail);
memcpy(buf, s->bufp, cnt);
s->avail -= cnt;
s->bufp += cnt;
buf += cnt;
total += cnt;
len -= cnt;
}
return total;
}
char *
http_error(int err)
{
char *errmsg = "Unknown error";
switch (err) {
case HTTP_NOERR:
return "";
case HTTP_BADHDR:
return "Unrecognized HTTP response";
case HTTP_BADREQ:
return "Bad HTTP request (check file name)";
case HTTP_NOFILE:
return "No such file";
case HTTP_OPEN:
return "Can't connect to host";
case HTTP_IO:
return "I/O error";
case HTTP_FORBIDDEN:
return "Forbidden (check permissions)";
}
return errmsg;
}
//
// RedBoot interface
//
GETC_IO_FUNCS(http_io, http_stream_open, http_stream_close,
0, http_stream_read, http_error);
RedBoot_load(http, http_io, true, true, 0);
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