http_client.c

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1	//==========================================================================
2	//
3	// net/http_client.c
4	//
5	// Stand-alone HTTP support for RedBoot
6	//
7	//==========================================================================
8	//####ECOSGPLCOPYRIGHTBEGIN####
9	// -------------------------------------------
10	// This file is part of eCos, the Embedded Configurable Operating System.
11	// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
12	// Copyright (C) 2002, 2003 Gary Thomas
13	//
14	// eCos is free software; you can redistribute it and/or modify it under
15	// the terms of the GNU General Public License as published by the Free
16	// Software Foundation; either version 2 or (at your option) any later version.
17	//
18	// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
19	// WARRANTY; without even the implied warranty of MERCHANTABILITY or
20	// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21	// for more details.
22	//
23	// You should have received a copy of the GNU General Public License along
24	// with eCos; if not, write to the Free Software Foundation, Inc.,
25	// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
26	//
27	// As a special exception, if other files instantiate templates or use macros
28	// or inline functions from this file, or you compile this file and link it
29	// with other works to produce a work based on this file, this file does not
30	// by itself cause the resulting work to be covered by the GNU General Public
31	// License. However the source code for this file must still be made available
32	// in accordance with section (3) of the GNU General Public License.
33	//
34	// This exception does not invalidate any other reasons why a work based on
35	// this file might be covered by the GNU General Public License.
36	//
37	// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
38	// at http://sources.redhat.com/ecos/ecos-license/
39	// -------------------------------------------
40	//####ECOSGPLCOPYRIGHTEND####
41	//==========================================================================
42	//#####DESCRIPTIONBEGIN####
43	//
44	// Author(s): gthomas
45	// Contributors: gthomas
46	// Date: 2002-05-22
47	// Purpose:
48	// Description:
49	//
50	// This code is part of RedBoot (tm).
51	//
52	//####DESCRIPTIONEND####
53	//
54	//==========================================================================
55
56	// HTTP client support
57
58	#include <redboot.h> // have_net
59	#include <net/net.h>
60	#include <net/http.h>
61
62	// So we remember which ports have been used
63	static int get_port = 7800;
64
65	static struct _stream {
66	bool open;
67	int avail, actual_len, pos, filelen;
68	char data[4096];
69	char *bufp;
70	tcp_socket_t sock;
71	} http_stream;
72
73	static __inline__ int min(int a, int b)
74	{
75	if (a < b)
76	return a;
77	else
78	return b;
79	}
80
81	int http_stream_open(connection_info_t * info, int *err)
82	{
83	int res;
84	struct _stream *s = &http_stream;
85
86	if (!info->server->sin_port)
87	info->server->sin_port = 80; // HTTP port
88	if ((res =
89	__tcp_open(&s->sock, info->server, get_port++, 5000, err)) < 0) {
90	*err = HTTP_OPEN;
91	return -1;
92	}
93	diag_sprintf(s->data, "GET %s HTTP/1.0\r\n\r\n", info->filename);
94	__tcp_write_block(&s->sock, s->data, strlen(s->data));
95	s->avail = 0;
96	s->open = true;
97	s->pos = 0;
98	return 0;
99	}
100
101	void http_stream_close(int *err)
102	{
103	struct _stream *s = &http_stream;
104
105	if (s->open) {
106	__tcp_abort(&s->sock, 1);
107	s->open = false;
108	}
109	}
110
111	int http_stream_read(char buf, int len, int err)
112	{
113	struct _stream *s = &http_stream;
114	int total = 0;
115	int cnt, code;
116
117	if (!s->open) {
118	return -1; // Shouldn't happen, but...
119	}
120	while (len) {
121	while (s->avail == 0) {
122	// Need to wait for some data to arrive
123	__tcp_poll();
124	if (s->sock.state != _ESTABLISHED) {
125	if (s->sock.state == _CLOSE_WAIT) {
126	// This connection is breaking
127	if (s->sock.data_bytes == 0
128	&& s->sock.rxcnt == 0) {
129	__tcp_close(&s->sock);
130	return total;
131	}
132	} else if (s->sock.state == _CLOSED) {
133	// The connection is gone
134	s->open = false;
135	return -1;
136	} else {
137	*err = HTTP_IO;
138	return -1;
139	}
140	}
141	s->actual_len =
142	__tcp_read(&s->sock, s->data, sizeof(s->data));
143	if (s->actual_len > 0) {
144	s->bufp = s->data;
145	s->avail = s->actual_len;
146	if (s->pos == 0) {
147	// First data - need to scan HTTP response header
148	if (strncmp(s->bufp, "HTTP/", 5) == 0) {
149	// Should look like "HTTP/1.1 200 OK"
150	s->bufp += 5;
151	s->avail -= 5;
152	// Find first space
153	while ((s->avail > 0)
154	&& (*s->bufp != ' ')) {
155	s->bufp++;
156	s->avail--;
157	}
158	// Now the integer response
159	code = 0;
160	while ((s->avail > 0)
161	&& (*s->bufp == ' ')) {
162	s->bufp++;
163	s->avail--;
164	}
165	while ((s->avail > 0)
166	&& isdigit(*s->bufp)) {
167	code =
168	(code * 10) +
169	(*s->bufp - '0');
170	s->bufp++;
171	s->avail--;
172	}
173	// Make sure it says OK
174	while ((s->avail > 0)
175	&& (*s->bufp == ' ')) {
176	s->bufp++;
177	s->avail--;
178	}
179	if (strncmp(s->bufp, "OK", 2)) {
180	switch (code) {
181	case 400:
182	*err =
183	HTTP_BADREQ;
184	break;
185	case 404:
186	*err =
187	HTTP_NOFILE;
188	break;
189	default:
190	*err =
191	HTTP_BADHDR;
192	break;
193	}
194	return -1;
195	}
196	// Find \r\n\r\n - end of HTTP preamble
197	while (s->avail >= 4) {
198	// This could be done faster, but not simpler
199	if (strncmp
200	(s->bufp,
201	"\r\n\r\n",
202	4) == 0) {
203	s->bufp += 4;
204	s->avail -= 4;
205	#if 0 // DEBUG - show header
206	*(s->bufp - 2) =
207	'\0';
208	diag_printf
209	(s->data);
210	#endif
211	break;
212	}
213	s->avail--;
214	s->bufp++;
215	}
216	s->pos++;
217	} else {
218	// Unrecognized response
219	*err = HTTP_BADHDR;
220	return -1;
221	}
222	}
223	} else if (s->actual_len < 0) {
224	*err = HTTP_IO;
225	return -1;
226	}
227	}
228	cnt = min(len, s->avail);
229	memcpy(buf, s->bufp, cnt);
230	s->avail -= cnt;
231	s->bufp += cnt;
232	buf += cnt;
233	total += cnt;
234	len -= cnt;
235	}
236	return total;
237	}
238
239	char *http_error(int err)
240	{
241	char *errmsg = "Unknown error";
242
243	switch (err) {
244	case HTTP_NOERR:
245	return "";
246	case HTTP_BADHDR:
247	return "Unrecognized HTTP response";
248	case HTTP_BADREQ:
249	return "Bad HTTP request (check file name)";
250	case HTTP_NOFILE:
251	return "No such file";
252	case HTTP_OPEN:
253	return "Can't connect to host";
254	case HTTP_IO:
255	return "I/O error";
256	}
257	return errmsg;
258	}
259
260	//
261	// RedBoot interface
262	//
263	GETC_IO_FUNCS(http_io, http_stream_open, http_stream_close,
264	0, http_stream_read, http_error);
265	RedBoot_load(http, http_io, true, true, 0);

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root/ar5315_microredboot/microredboot/ecos/packages/redboot/current/src/net/http_client.c

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