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px4-firmware/apps/netutils/webserver/httpd.c

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/****************************************************************************
* netutils/webserver/httpd.c
* httpd Web server
*
* Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* This is a leverage of similar logic from uIP:
*
* Author: Adam Dunkels <adam@sics.se>
* Copyright (c) 2004, Adam Dunkels.
* All rights reserved.
*
* The uIP web server is a very simplistic implementation of an HTTP
* server. It can serve web pages and files from a read-only ROM
* filesystem, and provides a very small scripting language.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/net/uip/uip.h>
#include <apps/netutils/uiplib.h>
#include <apps/netutils/httpd.h>
#include "httpd.h"
#include "httpd_cgi.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define ISO_nl 0x0a
#define ISO_space 0x20
#define ISO_bang 0x21
#define ISO_percent 0x25
#define ISO_period 0x2e
#define ISO_slash 0x2f
#define ISO_colon 0x3a
/****************************************************************************
* Private Data
****************************************************************************/
static const char g_httpcontenttypebinary[] = "Content-type: application/octet-stream\r\n\r\n";
static const char g_httpcontenttypecss[] = "Content-type: text/css\r\n\r\n";
static const char g_httpcontenttypegif[] = "Content-type: image/gif\r\n\r\n";
static const char g_httpcontenttypehtml[] = "Content-type: text/html\r\n\r\n";
static const char g_httpcontenttypejpg[] = "Content-type: image/jpeg\r\n\r\n";
static const char g_httpcontenttypeplain[] = "Content-type: text/plain\r\n\r\n";
static const char g_httpcontenttypepng[] = "Content-type: image/png\r\n\r\n";
static const char g_httpextensionhtml[] = ".html";
static const char g_httpextensionshtml[] = ".shtml";
static const char g_httpextensioncss[] = ".css";
static const char g_httpextensionpng[] = ".png";
static const char g_httpextensiongif[] = ".gif";
static const char g_httpextensionjpg[] = ".jpg";
static const char g_http404path[] = "/404.html";
static const char g_httpindexpath[] = "/index.html";
static const char g_httpcmdget[] = "GET ";
static const char g_httpheader200[] =
"HTTP/1.0 200 OK\r\n"
"Server: uIP/1.0 http://www.sics.se/~adam/uip/\r\n"
"Connection: close\r\n";
static const char g_httpheader404[] =
"HTTP/1.0 404 Not found\r\n"
"Server: uIP/1.0 http://www.sics.se/~adam/uip/\r\n"
"Connection: close\r\n";
/****************************************************************************
* Private Functions
****************************************************************************/
#ifdef CONFIG_NETUTILS_HTTPD_DUMPBUFFER
static void httpd_dumpbuffer(FAR const char *msg, FAR const char *buffer, unsigned int nbytes)
{
/* CONFIG_DEBUG, CONFIG_DEBUG_VERBOSE, and CONFIG_DEBUG_NET have to be
* defined or the following does nothing.
*/
nvdbgdumpbuffer(msg, (FAR const uint8_t*)buffer, nbytes);
}
#else
# define httpd_dumpbuffer(msg,buffer,nbytes)
#endif
#ifdef CONFIG_NETUTILS_HTTPD_DUMPPSTATE
static void httpd_dumppstate(struct httpd_state *pstate, const char *msg)
{
#if defined(CONFIG_DEBUG) && defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_NET)
nvdbg("[%d] pstate(%p): [%s]\n", pstate->ht_sockfd, pstate, msg);
nvdbg(" filename: [%s]\n", pstate->ht_filename);
nvdbg(" htfile len: %d\n", pstate->ht_file.len);
nvdbg(" sockfd: %d\n", pstate->ht_sockfd);
nvdbg(" scriptptr: %p\n", pstate->ht_scriptptr);
nvdbg(" scriptlen: %d\n", pstate->ht_scriptlen);
nvdbg(" sndlen: %d\n", pstate->ht_sndlen);
#endif
}
#else
# define httpd_dumppstate(pstate, msg)
#endif
static void next_scriptstate(struct httpd_state *pstate)
{
char *p;
p = strchr(pstate->ht_scriptptr, ISO_nl) + 1;
pstate->ht_scriptlen -= (unsigned short)(p - pstate->ht_scriptptr);
pstate->ht_scriptptr = p;
}
static int handle_script(struct httpd_state *pstate)
{
int len;
char *ptr;
while (pstate->ht_file.len > 0)
{
/* Check if we should start executing a script */
if (*pstate->ht_file.data == ISO_percent && *(pstate->ht_file.data + 1) == ISO_bang)
{
pstate->ht_scriptptr = pstate->ht_file.data + 3;
pstate->ht_scriptlen = pstate->ht_file.len - 3;
if (*(pstate->ht_scriptptr - 1) == ISO_colon)
{
httpd_fs_open(pstate->ht_scriptptr + 1, &pstate->ht_file);
send(pstate->ht_sockfd, pstate->ht_file.data, pstate->ht_file.len, 0);
}
else
{
httpd_cgi(pstate->ht_scriptptr)(pstate, pstate->ht_scriptptr);
}
next_scriptstate(pstate);
/* The script is over, so we reset the pointers and continue
* sending the rest of the file
*/
pstate->ht_file.data = pstate->ht_scriptptr;
pstate->ht_file.len = pstate->ht_scriptlen;
}
else
{
/* See if we find the start of script marker in the block of HTML
* to be sent
*/
if (pstate->ht_file.len > HTTPD_IOBUFFER_SIZE)
{
len = HTTPD_IOBUFFER_SIZE;
}
else
{
len = pstate->ht_file.len;
}
if (*pstate->ht_file.data == ISO_percent)
{
ptr = strchr(pstate->ht_file.data + 1, ISO_percent);
}
else
{
ptr = strchr(pstate->ht_file.data, ISO_percent);
}
if (ptr != NULL && ptr != pstate->ht_file.data)
{
len = (int)(ptr - pstate->ht_file.data);
if (len >= HTTPD_IOBUFFER_SIZE)
{
len = HTTPD_IOBUFFER_SIZE;
}
}
send(pstate->ht_sockfd, pstate->ht_file.data, len, 0);
pstate->ht_file.data += len;
pstate->ht_file.len -= len;
}
}
return OK;
}
static int httpd_addchunk(struct httpd_state *pstate, const char *buffer, int len)
{
int newlen;
int chunklen;
int ret;
do
{
/* Determine the size of the next chunk so that it fits into the buffer */
newlen = pstate->ht_sndlen + len;
if (newlen > HTTPD_IOBUFFER_SIZE)
{
newlen = HTTPD_IOBUFFER_SIZE;
chunklen = HTTPD_IOBUFFER_SIZE - pstate->ht_sndlen;
}
else
{
chunklen = len;
}
nvdbg("[%d] sndlen=%d len=%d newlen=%d chunklen=%d\n",
pstate->ht_sockfd, pstate->ht_sndlen, len, newlen, chunklen);
/* Copy that chunk into the send buffer */
memcpy(&pstate->ht_buffer[pstate->ht_sndlen], buffer, chunklen);
if (newlen >= HTTPD_IOBUFFER_SIZE)
{
/* The buffer is full.. Send what we have and reset to send again */
httpd_dumpbuffer("Outgoing buffer", pstate->ht_buffer, newlen);
ret = send(pstate->ht_sockfd, pstate->ht_buffer, newlen, 0);
if (ret < 0)
{
return ret;
}
newlen = 0;
}
pstate->ht_sndlen = newlen;
len -= chunklen;
buffer += chunklen;
}
while (len > 0);
return OK;
}
static int send_headers(struct httpd_state *pstate, const char *statushdr, int len)
{
char *ptr;
int ret;
ret = httpd_addchunk(pstate, statushdr, len);
if (ret < 0)
{
return ret;
}
ptr = strrchr(pstate->ht_filename, ISO_period);
if (ptr == NULL)
{
ret = httpd_addchunk(pstate, g_httpcontenttypebinary, strlen(g_httpcontenttypebinary));
}
else if (strncmp(g_httpextensionhtml, ptr, strlen(g_httpextensionhtml)) == 0 ||
strncmp(g_httpextensionshtml, ptr, strlen(g_httpextensionshtml)) == 0)
{
ret = httpd_addchunk(pstate, g_httpcontenttypehtml, strlen(g_httpcontenttypehtml));
}
else if (strncmp(g_httpextensioncss, ptr, strlen(g_httpextensioncss)) == 0)
{
ret = httpd_addchunk(pstate, g_httpcontenttypecss, strlen(g_httpcontenttypecss));
}
else if (strncmp(g_httpextensionpng, ptr, strlen(g_httpextensionpng)) == 0)
{
ret = httpd_addchunk(pstate, g_httpcontenttypepng, strlen(g_httpcontenttypepng));
}
else if (strncmp(g_httpextensiongif, ptr, strlen(g_httpextensiongif)) == 0)
{
ret = httpd_addchunk(pstate, g_httpcontenttypegif, strlen(g_httpcontenttypegif));
}
else if (strncmp(g_httpextensionjpg, ptr, strlen(g_httpextensionjpg)) == 0)
{
ret = httpd_addchunk(pstate, g_httpcontenttypejpg, strlen(g_httpcontenttypejpg));
}
else
{
ret = httpd_addchunk(pstate, g_httpcontenttypeplain, strlen(g_httpcontenttypeplain));
}
return ret;
}
static int httpd_sendfile(struct httpd_state *pstate)
{
char *ptr;
int ret = ERROR;
pstate->ht_sndlen = 0;
nvdbg("[%d] sending file '%s'\n", pstate->ht_sockfd, pstate->ht_filename);
if (!httpd_fs_open(pstate->ht_filename, &pstate->ht_file))
{
ndbg("[%d] '%s' not found\n", pstate->ht_sockfd, pstate->ht_filename);
memcpy(pstate->ht_filename, g_http404path, strlen(g_http404path));
httpd_fs_open(g_http404path, &pstate->ht_file);
if (send_headers(pstate, g_httpheader404, strlen(g_httpheader404)) == OK)
{
ret = httpd_addchunk(pstate, pstate->ht_file.data, pstate->ht_file.len);
}
}
else
{
if (send_headers(pstate, g_httpheader200, strlen(g_httpheader200)) == OK)
{
ptr = strchr(pstate->ht_filename, ISO_period);
if (ptr != NULL &&
strncmp(ptr, g_httpextensionshtml, strlen(g_httpextensionshtml)) == 0)
{
ret = handle_script(pstate);
}
else
{
ret = httpd_addchunk(pstate, pstate->ht_file.data, pstate->ht_file.len);
}
}
}
/* Send anything remaining in the buffer */
if (ret == OK && pstate->ht_sndlen > 0)
{
httpd_dumpbuffer("Outgoing buffer", pstate->ht_buffer, pstate->ht_sndlen);
if (send(pstate->ht_sockfd, pstate->ht_buffer, pstate->ht_sndlen, 0) < 0)
{
ret = ERROR;
}
}
return ret;
}
static inline int httpd_cmd(struct httpd_state *pstate)
{
ssize_t recvlen;
int i;
/* Get the next HTTP command. We will handle only GET */
recvlen = recv(pstate->ht_sockfd, pstate->ht_buffer, HTTPD_IOBUFFER_SIZE, 0);
if (recvlen < 0)
{
ndbg("[%d] recv failed: %d\n", pstate->ht_sockfd, errno);
return ERROR;
}
lese if (recvlen == 0)
{
ndbg("[%d] connection lost\n", pstate->ht_sockfd);
return ERROR;
}
httpd_dumpbuffer("Incoming buffer", pstate->ht_buffer, recvlen);
/* We will handle only GET */
if (strncmp(pstate->ht_buffer, g_httpcmdget, strlen(g_httpcmdget)) != 0)
{
ndbg("[%d] Unsupported command\n", pstate->ht_sockfd);
return ERROR;
}
/* Get the name of the file to provide */
if (pstate->ht_buffer[4] != ISO_slash)
{
ndbg("[%d] Missing path\n", pstate->ht_sockfd);
return ERROR;
}
else if (pstate->ht_buffer[5] == ISO_space)
{
strncpy(pstate->ht_filename, g_httpindexpath, strlen(g_httpindexpath));
}
else
{
for (i = 0;
i < (HTTPD_MAX_FILENAME-1) && pstate->ht_buffer[i+4] != ISO_space;
i++)
{
pstate->ht_filename[i] = pstate->ht_buffer[i+4];
}
pstate->ht_filename[i]='\0';
}
nvdbg("[%d] Filename: %s\n", pstate->ht_sockfd, pstate->ht_filename);
/* Then send the file */
return httpd_sendfile(pstate);
}
/****************************************************************************
* Name: httpd_handler
*
* Description:
* Each time a new connection to port 80 is made, a new thread is created
* that begins at this entry point. There should be exactly one argument
* and it should be the socket descriptor (+1).
*
****************************************************************************/
static void *httpd_handler(void *arg)
{
struct httpd_state *pstate = (struct httpd_state *)malloc(sizeof(struct httpd_state));
int sockfd = (int)arg;
int ret = ERROR;
nvdbg("[%d] Started\n", sockfd);
/* Verify that the state structure was successfully allocated */
if (pstate)
{
/* Re-initialize the thread state structure */
memset(pstate, 0, sizeof(struct httpd_state));
pstate->ht_sockfd = sockfd;
/* Then handle the next httpd command */
ret = httpd_cmd(pstate);
/* End of command processing -- Clean up and exit */
free(pstate);
}
/* Exit the task */
nvdbg("[%d] Exitting\n", sockfd);
close(sockfd);
return NULL;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: httpd_listen
*
* Description:
* This is the main processing thread for the webserver. It never returns
* unless an error occurs
*
****************************************************************************/
int httpd_listen(void)
{
/* Execute httpd_handler on each connection to port 80 */
uip_server(HTONS(80), httpd_handler, CONFIG_NETUTILS_HTTPDSTACKSIZE);
/* uip_server only returns on errors */
return ERROR;
}
/****************************************************************************
* Name: httpd_init
*
* Description:
* This function initializes the web server and should be called at system
* boot-up.
*
****************************************************************************/
void httpd_init(void)
{
}
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