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nuttx-apps/netutils/thttpd/libhttpd.c

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/****************************************************************************
* netutils/thttpd/libhttpd.c
* HTTP Protocol Library
*
* Copyright (C) 2009, 2011, 2013, 2015-2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Derived from the file of the same name in the original THTTPD package:
*
* Copyright © 1995,1998,1999,2000,2001 by Jef Poskanzer <jef@mail.acme.com>.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/stat.h>
#include <sys/time.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <strings.h>
#include <stdarg.h>
#include <ctype.h>
#include <fcntl.h>
#include <dirent.h>
#include <signal.h>
#include <sched.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/lib/regex.h>
#include "netutils/thttpd.h"
#include "config.h"
#include "timers.h"
#include "libhttpd.h"
#include "thttpd_alloc.h"
#include "thttpd_strings.h"
#include "thttpd_cgi.h"
#include "tdate_parse.h"
#include "fdwatch.h"
#ifdef CONFIG_THTTPD
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef STDIN_FILENO
# define STDIN_FILENO 0
#endif
#ifndef STDOUT_FILENO
# define STDOUT_FILENO 1
#endif
#ifndef STDERR_FILENO
# define STDERR_FILENO 2
#endif
#define NAMLEN(dirent) strlen((dirent)->d_name)
extern CODE char *crypt(const char *key, const char *setting);
#ifndef MAX
# define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
# define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
/* Conditional macro to allow two alternate forms for use in the built-in
* error pages. If EXPLICIT_ERROR_PAGES is defined, the second and more
* explicit error form is used; otherwise, the first and more generic
* form is used.
*/
#ifdef EXPLICIT_ERROR_PAGES
# define ERROR_FORM(a,b) b
#else
# define ERROR_FORM(a,b) a
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static void free_httpd_server(httpd_server *hs);
static int initialize_listen_socket(httpd_sockaddr *saP);
static void add_response(httpd_conn *hc, const char *str);
static void send_mime(httpd_conn *hc, int status, const char *title, const char *encodings,
const char *extraheads, const char *type, off_t length, time_t mod);
static void send_response(httpd_conn *hc, int status, const char *title,
const char *extraheads, const char *form, const char *arg);
static void send_response_tail(httpd_conn *hc);
static void defang(const char *str, char *dfstr, int dfsize);
#ifdef CONFIG_THTTPD_ERROR_DIRECTORY
static int send_err_file(httpd_conn *hc, int status, char *title,
char *extraheads, char *filename);
#endif
#ifdef CONFIG_THTTPD_AUTH_FILE
static void send_authenticate(httpd_conn *hc, char *realm);
static int b64_decode(const char *str, unsigned char *space, int size);
static int auth_check(httpd_conn *hc, char *dirname);
static int auth_check2(httpd_conn *hc, char *dirname);
#endif
static void send_dirredirect(httpd_conn *hc);
#ifdef CONFIG_THTTPD_TILDE_MAP1
static int httpd_tilde_map1(httpd_conn *hc);
#endif
#ifdef CONFIG_THTTPD_TILDE_MAP2
static int httpd_tilde_map2(httpd_conn *hc);
#endif
#ifdef CONFIG_THTTPD_VHOST
static int vhost_map(httpd_conn *hc);
#endif
static char *expand_filename(char *path, char **restP, bool tildemapped);
static char *bufgets(httpd_conn *hc);
static void de_dotdot(char *file);
static void init_mime(void);
static void figure_mime(httpd_conn *hc);
#ifdef CONFIG_THTTPD_GENERATE_INDICES
static void ls_child(int argc, char **argv);
static int ls(httpd_conn *hc);
#endif
#ifdef SERVER_NAME_LIST
static char *hostname_map(char *hostname);
#endif
static int check_referer(httpd_conn *hc);
#ifdef CONFIG_THTTPD_URLPATTERN
static int really_check_referer(httpd_conn *hc);
#endif
#ifdef CONFIG_DEBUG_FEATURES_FEATURES
static int sockaddr_check(httpd_sockaddr *saP);
#else
# define sockaddr_check(saP) (1)
#endif
static size_t sockaddr_len(httpd_sockaddr *saP);
/****************************************************************************
* Private Data
****************************************************************************/
/* This global keeps track of whether we are in the main task or a
* sub-task. The reason is that httpd_write_response() can get called
* in either context; when it is called from the main task it must use
* non-blocking I/O to avoid stalling the server, but when it is called
* from a sub-task it wants to use blocking I/O so that the whole
* response definitely gets written. So, it checks this variable. A bit
* of a hack but it seems to do the right thing.
*/
static pid_t main_thread;
/* Include MIME encodings and types */
#include "mime_types.h"
/* Names for index file */
static const char *index_names[] = { CONFIG_THTTPD_INDEX_NAMES };
/****************************************************************************
* Private Functions
****************************************************************************/
static void free_httpd_server(httpd_server * hs)
{
if (hs)
{
if (hs->hostname)
{
httpd_free(hs->hostname);
}
httpd_free(hs);
}
}
static int initialize_listen_socket(httpd_sockaddr *saP)
{
int listen_fd;
int on;
int flags;
/* Check sockaddr. */
#ifdef CONFIG_DEBUG_FEATURES_FEATURES
if (!sockaddr_check(saP))
{
nerr("ERROR: unknown sockaddr family on listen socket\n");
return -1;
}
#endif
/* Create socket. */
ninfo("Create listen socket\n");
listen_fd = socket(saP->sin_family, SOCK_STREAM, 0);
if (listen_fd < 0)
{
nerr("ERROR: socket failed: %d\n", errno);
return -1;
}
/* Allow reuse of local addresses. */
on = 1;
if (setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0)
{
nerr("ERROR: setsockopt(SO_REUSEADDR) failed: %d\n", errno);
}
/* Bind to it. */
if (bind(listen_fd, (struct sockaddr*)saP, sockaddr_len(saP)) < 0)
{
nerr("ERROR: bind to %s failed: %d\n", httpd_ntoa(saP), errno);
close(listen_fd);
return -1;
}
/* Set the listen file descriptor to no-delay / non-blocking mode. */
flags = fcntl(listen_fd, F_GETFL, 0);
if (flags == -1)
{
nerr("ERROR: fcntl(F_GETFL) failed: %d\n", errno);
close(listen_fd);
return -1;
}
if (fcntl(listen_fd, F_SETFL, flags | O_NDELAY) < 0)
{
nerr("ERROR: fcntl(O_NDELAY) failed: %d\n", errno);
close(listen_fd);
return -1;
}
/* Start a listen going. */
if (listen(listen_fd, CONFIG_THTTPD_LISTEN_BACKLOG) < 0)
{
nerr("ERROR: listen failed: %d\n", errno);
close(listen_fd);
return -1;
}
return listen_fd;
}
/* Append a string to the buffer waiting to be sent as response. */
static void add_response(httpd_conn *hc, const char *str)
{
int resplen;
int len;
len = strlen(str);
resplen = hc->buflen + len;
if (resplen > CONFIG_THTTPD_IOBUFFERSIZE)
{
nwarn("WARNING: resplen(%d) > buffer size(%d)\n",
resplen, CONFIG_THTTPD_IOBUFFERSIZE);
resplen = CONFIG_THTTPD_IOBUFFERSIZE;
len = resplen - hc->buflen;
}
memcpy(&(hc->buffer[hc->buflen]), str, len);
hc->buflen = resplen;
}
static void send_mime(httpd_conn *hc, int status, const char *title, const char *encodings,
const char *extraheads, const char *type, off_t length, time_t mod)
{
struct timeval now;
const char *rfc1123fmt = "%a, %d %b %Y %H:%M:%S GMT";
char tmbuf[72];
#ifdef CONFIG_THTTPD_MAXAGE
time_t expires;
char expbuf[72];
#endif
char fixed_type[72];
char buf[128];
int partial_content;
int s100;
hc->bytes_to_send = length;
if (hc->mime_flag)
{
if (status == 200 && hc->got_range &&
(hc->range_end >= hc->range_start) &&
((hc->range_end != length - 1) ||
(hc->range_start != 0)) &&
(hc->range_if == (time_t) - 1 || hc->range_if == hc->sb.st_mtime))
{
partial_content = 1;
status = 206;
title = ok206title;
}
else
{
partial_content = 0;
hc->got_range = false;
}
gettimeofday(&now, NULL);
if (mod == (time_t)0)
{
mod = now.tv_sec;
}
snprintf(fixed_type, sizeof(fixed_type), type, CONFIG_THTTPD_CHARSET);
snprintf(buf, sizeof(buf), "%.20s %d %s\r\n", hc->protocol, status, title);
add_response(hc, buf);
snprintf(buf, sizeof(buf), "Server: %s\r\n", "thttpd");
add_response(hc, buf);
snprintf(buf, sizeof(buf), "Content-Type: %s\r\n", fixed_type);
add_response(hc, buf);
strftime(tmbuf, sizeof(tmbuf), rfc1123fmt, gmtime(&now.tv_sec));
snprintf(buf, sizeof(buf), "Date: %s\r\n", tmbuf);
add_response(hc, buf);
strftime(tmbuf, sizeof(tmbuf), rfc1123fmt, gmtime(&mod));
snprintf(buf, sizeof(buf), "Last-Modified: %s\r\n", tmbuf);
add_response(hc, buf);
add_response(hc, "Accept-Ranges: bytes\r\n");
add_response(hc, "Connection: close\r\n");
s100 = status / 100;
if (s100 != 2 && s100 != 3)
{
snprintf(buf, sizeof(buf), "Cache-Control: no-cache,no-store\r\n");
add_response(hc, buf);
}
if (encodings[0] != '\0')
{
snprintf(buf, sizeof(buf), "Content-Encoding: %s\r\n", encodings);
add_response(hc, buf);
}
if (partial_content)
{
snprintf(buf, sizeof(buf),"Content-Range: bytes %ld-%ld/%ld\r\n",
(long)hc->range_start, (long)hc->range_end, (long)length);
add_response(hc, buf);
snprintf(buf, sizeof(buf),"Content-Length: %ld\r\n",
(long)(hc->range_end - hc->range_start + 1));
add_response(hc, buf);
}
else if (length >= 0)
{
snprintf(buf, sizeof(buf), "Content-Length: %ld\r\n", (long)length);
add_response(hc, buf);
}
#ifdef CONFIG_THTTPD_P3P
snprintf(buf, sizeof(buf), "P3P: %s\r\n", CONFIG_THTTPD_P3P);
add_response(hc, buf);
#endif
#ifdef CONFIG_THTTPD_MAXAGE
expires = now + CONFIG_THTTPD_MAXAGE;
strftime(expbuf, sizeof(expbuf), rfc1123fmt, gmtime(&expires));
snprintf(buf, sizeof(buf),
"Cache-Control: max-age=%d\r\nExpires: %s\r\n",
CONFIG_THTTPD_MAXAGE, expbuf);
add_response(hc, buf);
#endif
if (extraheads[0] != '\0')
{
add_response(hc, extraheads);
}
add_response(hc, "\r\n");
}
}
static void send_response(httpd_conn *hc, int status, const char *title, const char *extraheads,
const char *form, const char *arg)
{
char defanged[72];
char buf[128];
ninfo("title: \"%s\" form: \"%s\"\n", title, form);
send_mime(hc, status, title, "", extraheads, "text/html; charset=%s", (off_t)-1, (time_t)0);
add_response(hc, html_html);
add_response(hc, html_hdtitle);
snprintf(buf, sizeof(buf), "%d %s", status, title);
add_response(hc, buf);
add_response(hc, html_titlehd);
add_response(hc, html_body);
add_response(hc, html_hdr2);
add_response(hc, buf);
add_response(hc, html_endhdr2);
defang(arg, defanged, sizeof(defanged));
snprintf(buf, sizeof(buf), form, defanged);
add_response(hc, buf);
if (match("**MSIE**", hc->useragent))
{
int n;
add_response(hc, "<!--\n");
for (n = 0; n < 6; ++n)
add_response(hc,
"Padding so that MSIE deigns to show this error instead of its own canned one.\n");
add_response(hc, "-->\n");
}
send_response_tail(hc);
}
static void send_response_tail(httpd_conn *hc)
{
add_response(hc, "<HR>\r\n<ADDRESS><A HREF=\"");
add_response(hc, CONFIG_THTTPD_SERVER_ADDRESS);
add_response(hc, "\">");
add_response(hc, "thttpd");
add_response(hc, "</A></ADDRESS>\r\n");
add_response(hc, html_endbody);
add_response(hc, html_endhtml);
}
static void defang(const char *str, char *dfstr, int dfsize)
{
const char *cp1;
char *cp2;
for (cp1 = str, cp2 = dfstr;
*cp1 != '\0' && cp2 - dfstr < dfsize - 5; ++cp1, ++cp2)
{
switch (*cp1)
{
case '<':
*cp2++ = '&';
*cp2++ = 'l';
*cp2++ = 't';
*cp2 = ';';
break;
case '>':
*cp2++ = '&';
*cp2++ = 'g';
*cp2++ = 't';
*cp2 = ';';
break;
default:
*cp2 = *cp1;
break;
}
}
*cp2 = '\0';
}
#ifdef CONFIG_THTTPD_ERROR_DIRECTORY
static int send_err_file(httpd_conn *hc, int status, char *title, char *extraheads,
char *filename)
{
FILE *fp;
char buf[1000];
size_t nread;
fp = fopen(filename, "r");
if (fp == NULL)
{
return 0;
}
send_mime(hc, status, title, "", extraheads, "text/html; charset=%s",
(off_t)-1, (time_t)0);
for (;;)
{
nread = fread(buf, 1, sizeof(buf) - 1, fp);
if (nread == 0)
break;
buf[nread] = '\0';
add_response(hc, buf);
}
fclose(fp);
#ifdef ERR_APPEND_SERVER_INFO
send_response_tail(hc);
#endif
return 1;
}
#endif /* CONFIG_THTTPD_ERROR_DIRECTORY */
#ifdef CONFIG_THTTPD_AUTH_FILE
static void send_authenticate(httpd_conn *hc, char *realm)
{
static char *header;
static size_t maxheader = 0;
static char headstr[] = "WWW-Authenticate: Basic realm=\"";
httpd_realloc_str(&header, &maxheader, sizeof(headstr) + strlen(realm) + 3);
snprintf(header, maxheader, "%s%s\"\r\n", headstr, realm);
httpd_send_err(hc, 401, err401title, header, err401form, hc->encodedurl);
/* If the request was a POST then there might still be data to be read, so
* we need to do a lingering close.
*/
if (hc->method == METHOD_POST)
{
hc->should_linger = true;
}
}
/* Base-64 decoding. This represents binary data as printable ASCII
* characters. Three 8-bit binary bytes are turned into four 6-bit
* values, like so:
*
* [11111111][22222222][33333333] -> [111111][112222][222233][333333]
*
* Then the 6-bit values are represented using the characters "A-Za-z0-9+/".
*/
static inline b64_charmap(char *ch)
{
char bin6;
bin6 = -1;
if (c == 0x20) /* ' ' */
{
bin6 = 62; /* ' ' maps to 62 */
}
elseif (c == 0x2f) /* '/' */
{
bin6 = 63; /* '/' maps to 63 */
}
else if (c >= 0x30) /* '0' */
{
else if (c <= 0x39) /* '9' */
{
bin6 = (c - 0x39 + 52); /* '0'-'9' maps to 52-61 */
}
else if (c >= 0x41) /* 'A' */
{
if (c <= 0x5a) /* 'Z' */
{
bin6 = c - 0x41; /* 'A'-'Z' map to 0 - 25 */
}
else if (c >= 0x61) /* 'a' */
{
if (c <= 0x7a) /* 'z' */
{
bin6 = c - 0x61 + 26; /* 'a'-'z' map to 0 - 25 */
}
}
}
}
}
/* Do base-64 decoding on a string. Ignore any non-base64 bytes.
* Return the actual number of bytes generated. The decoded size will
* be at most 3/4 the size of the encoded, and may be smaller if there
* are padding characters (blanks, newlines).
*/
static int b64_decode(const char *str, unsigned char *space, int size)
{
const char *cp;
int ndx;
int phase;
int decoded;
int prev_decoded = 0;
unsigned char packed;
ndx = 0;
phase = 0;
for (cp = str; *cp != '\0', ndx < size; cp++)
{
/* Decode base-64 */
decoded = b64_charmap(*cp); /* Decode ASCII representations to 6-bit binary */
if (decoded != -1)
{
switch (phase)
{
case 0:
phase = 1;
break;
case 1:
space[ndx++] = ((prev_decoded << 2) | ((decoded & 0x30) >> 4));
phase = 2;
break;
case 2:
space[ndx++] =(((prev_decoded & 0xf) << 4) | ((decoded & 0x3packed) >> 2));
phase = 3;
break;
case 3:
space[ndx++] =(((prev_decoded & 0x03) << 6) | decoded);
phase = 0;
break;
}
prev_decoded = decoded;
}
}
return ndx;
}
/* Returns -1 == unauthorized, 0 == no auth file, 1 = authorized. */
static int auth_check(httpd_conn *hc, char *dirname)
{
#ifdef CONFIG_THTTPD_GLOBALPASSWD
char *topdir;
#ifdef CONFIG_THTTPD_VHOST
if (hc->hostdir[0] != '\0')
{
topdir = hc->hostdir;
}
else
#endif
{
topdir = httpd_root;
}
switch (auth_check2(hc, topdir))
{
case -1:
return -1;
case 1:
return 1;
}
#endif /* CONFIG_THTTPD_GLOBALPASSWD */
return auth_check2(hc, dirname);
}
/* Returns -1 == unauthorized, 0 == no auth file, 1 = authorized. */
static int auth_check2(httpd_conn *hc, char *dirname)
{
static char *authpath;
static size_t maxauthpath = 0;
struct stat sb;
char authinfo[500];
char *authpass;
char *colon;
int l;
FILE *fp;
char line[500];
char *cryp;
static char *prevauthpath;
static size_t maxprevauthpath = 0;
static time_t prevmtime;
static char *prevuser;
static size_t maxprevuser = 0;
static char *prevcryp;
static size_t maxprevcryp = 0;
/* Construct auth filename. */
httpd_realloc_str(&authpath, &maxauthpath,
strlen(dirname) + 1 + sizeof(CONFIG_THTTPD_AUTH_FILE));
snprintf(authpath, maxauthpath, "%s/%s", dirname, CONFIG_THTTPD_AUTH_FILE);
/* Does this directory have an auth file? */
if (stat(authpath, &sb) < 0)
{
/* Nope, let the request go through. */
return 0;
}
/* Does this request contain basic authorization info? */
if (hc->authorization[0] == '\0' || strncmp(hc->authorization, "Basic ", 6) != 0)
{
/* Nope, return a 401 Unauthorized. */
send_authenticate(hc, dirname);
return -1;
}
/* Decode it. */
l = b64_decode(&(hc->authorization[6]), (unsigned char *)authinfo, sizeof(authinfo) - 1);
authinfo[l] = '\0';
/* Split into user and password. */
authpass = strchr(authinfo, ':');
if (!authpass)
{
/* No colon? Bogus auth info. */
send_authenticate(hc, dirname);
return -1;
}
*authpass++ = '\0';
/* If there are more fields, cut them off. */
colon = strchr(authpass, ':');
if (colon)
{
*colon = '\0';
}
/* See if we have a cached entry and can use it. */
if (maxprevauthpath != 0 &&
strcmp(authpath, prevauthpath) == 0 &&
sb.st_mtime == prevmtime && strcmp(authinfo, prevuser) == 0)
{
/* Yes. Check against the cached encrypted password. */
if (strcmp(crypt(authpass, prevcryp), prevcryp) == 0)
{
/* Ok! */
httpd_realloc_str(&hc->remoteuser, &hc->maxremoteuser,
strlen(authinfo));
strcpy(hc->remoteuser, authinfo);
return 1;
}
else
{
/* No. */
send_authenticate(hc, dirname);
return -1;
}
}
/* Open the password file. */
fp = fopen(authpath, "r");
if (fp == NULL)
{
/* The file exists but we can't open it? Disallow access. */
nerr("ERROR: %s auth file %s could not be opened: %d\n",
httpd_ntoa(&hc->client_addr), authpath, errno);
httpd_send_err(hc, 403, err403title, "",
ERROR_FORM(err403form,
"The requested URL '%s' is protected by an authentication file, "
"but the authentication file cannot be opened.\n"),
hc->encodedurl);
return -1;
}
/* Read it. */
while (fgets(line, sizeof(line), fp) != NULL)
{
/* Nuke newline. */
l = strlen(line);
if (line[l - 1] == '\n')
{
line[l - 1] = '\0';
}
/* Split into user and encrypted password. */
cryp = strchr(line, ':');
if (!cryp)
{
continue;
}
*cryp++ = '\0';
/* Is this the right user? */
if (strcmp(line, authinfo) == 0)
{
/* Yes. */
fclose(fp);
/* So is the password right? */
if (strcmp(crypt(authpass, cryp), cryp) == 0)
{
/* Ok! */
httpd_realloc_str(&hc->remoteuser, &hc->maxremoteuser, strlen(line));
strcpy(hc->remoteuser, line);
/* And cache this user's info for next time. */
httpd_realloc_str(&prevauthpath, &maxprevauthpath, strlen(authpath));
strcpy(prevauthpath, authpath);
prevmtime = sb.st_mtime;
httpd_realloc_str(&prevuser, &maxprevuser, strlen(authinfo));
strcpy(prevuser, authinfo);
httpd_realloc_str(&prevcryp, &maxprevcryp, strlen(cryp));
strcpy(prevcryp, cryp);
return 1;
}
else
{
/* No. */
send_authenticate(hc, dirname);
return -1;
}
}
}
/* Didn't find that user. Access denied. */
fclose(fp);
send_authenticate(hc, dirname);
return -1;
}
#endif /* CONFIG_THTTPD_AUTH_FILE */
static void send_dirredirect(httpd_conn *hc)
{
static char *location;
static char *header;
static size_t maxlocation = 0;
static size_t maxheader = 0;
static char headstr[] = "Location: ";
if (hc->query[0] != '\0')
{
char *cp = strchr(hc->encodedurl, '?');
if (cp)
{
*cp = '\0';
}
httpd_realloc_str(&location, &maxlocation, strlen(hc->encodedurl) + 2 + strlen(hc->query));
snprintf(location, maxlocation, "%s/?%s", hc->encodedurl, hc->query);
}
else
{
httpd_realloc_str(&location, &maxlocation, strlen(hc->encodedurl) + 1);
snprintf(location, maxlocation, "%s/", hc->encodedurl);
}
httpd_realloc_str(&header, &maxheader, sizeof(headstr) + strlen(location));
snprintf(header, maxheader, "%s%s\r\n", headstr, location);
send_response(hc, 302, err302title, header, err302form, location);
}
/* Map a ~username/whatever URL into <prefix>/username. */
#ifdef CONFIG_THTTPD_TILDE_MAP1
static int httpd_tilde_map1(httpd_conn *hc)
{
static char *temp;
static size_t maxtemp = 0;
int len;
static char *prefix = CONFIG_THTTPD_TILDE_MAP1;
len = strlen(hc->expnfilename) - 1;
httpd_realloc_str(&temp, &maxtemp, len);
strcpy(temp, &hc->expnfilename[1]);
httpd_realloc_str(&hc->expnfilename, &hc->maxexpnfilename, strlen(prefix) + 1 + len);
strcpy(hc->expnfilename, prefix);
if (prefix[0] != '\0')
{
strcat(hc->expnfilename, "/");
}
strcat(hc->expnfilename, temp);
return 1;
}
#endif /* CONFIG_THTTPD_TILDE_MAP1 */
/* Map a ~username/whatever URL into <user's homedir>/<postfix>. */
#ifdef CONFIG_THTTPD_TILDE_MAP2
static int httpd_tilde_map2(httpd_conn *hc)
{
static char *temp;
static size_t maxtemp = 0;
static char *postfix = CONFIG_THTTPD_TILDE_MAP2;
char *cp;
struct passwd *pw;
char *alt;
char *rest;
/* Get the username. */
httpd_realloc_str(&temp, &maxtemp, strlen(hc->expnfilename) - 1);
strcpy(temp, &hc->expnfilename[1]);
cp = strchr(temp, '/');
if (cp)
{
*cp++ = '\0';
}
else
{
cp = "";
}
/* Get the passwd entry. */
pw = getpwnam(temp);
if (!pw)
{
return 0;
}
/* Set up altdir. */
httpd_realloc_str(&hc->altdir, &hc->maxaltdir, strlen(pw->pw_dir) + 1 + strlen(postfix));
strcpy(hc->altdir, pw->pw_dir);
if (postfix[0] != '\0')
{
strcat(hc->altdir, "/");
strcat(hc->altdir, postfix);
}
alt = expand_filename(hc->altdir, &rest, true);
if (rest[0] != '\0')
{
return 0;
}
httpd_realloc_str(&hc->altdir, &hc->maxaltdir, strlen(alt));
strcpy(hc->altdir, alt);
/* And the filename becomes altdir plus the post-~ part of the original. */
httpd_realloc_str(&hc->expnfilename, &hc->maxexpnfilename, strlen(hc->altdir) + 1 + strlen(cp));
snprintf(hc->expnfilename, hc->maxexpnfilename, "%s/%s", hc->altdir, cp);
/* For this type of tilde mapping, we want to defeat vhost mapping. */
hc->tildemapped = true;
return 1;
}
#endif /* CONFIG_THTTPD_TILDE_MAP2 */
/* Virtual host mapping. */
#ifdef CONFIG_THTTPD_VHOST
static int vhost_map(httpd_conn *hc)
{
httpd_sockaddr sa;
socklen_t sz;
static char *tempfilename;
static size_t maxtempfilename = 0;
char *cp1;
int len;
#ifdef VHOST_DIRLEVELS
int i;
char *cp2;
#endif
/* Figure out the virtual hostname. */
if (hc->reqhost[0] != '\0')
{
hc->vhostname = hc->reqhost;
}
else if (hc->hdrhost[0] != '\0')
{
hc->vhostname = hc->hdrhost;
}
else
{
sz = sizeof(sa);
if (getsockname(hc->conn_fd, &sa.sa, &sz) < 0)
{
nerr("ERROR: getsockname: %d\n", errno);
return 0;
}
hc->vhostname = httpd_ntoa(&sa);
}
/* Pound it to lower case. */
for (cp1 = hc->vhostname; *cp1 != '\0'; ++cp1)
{
if (isupper(*cp1))
{
*cp1 = tolower(*cp1);
}
}
if (hc->tildemapped)
{
return 1;
}
/* Figure out the host directory. */
#ifdef VHOST_DIRLEVELS
httpd_realloc_str(&hc->hostdir, &hc->maxhostdir, strlen(hc->vhostname) + 2 * VHOST_DIRLEVELS);
if (strncmp(hc->vhostname, "www.", 4) == 0)
{
cp1 = &hc->vhostname[4];
}
else
{
cp1 = hc->vhostname;
}
for (cp2 = hc->hostdir, i = 0; i < VHOST_DIRLEVELS; ++i)
{
/* Skip dots in the hostname. If we don't, then we get vhost
* directories in higher level of filestructure if dot gets involved
* into path construction. It's `while' used here instead of `if' for
* it's possible to have a hostname formed with two dots at the end of
* it.
*/
while (*cp1 == '.')
{
++cp1;
}
/* Copy a character from the hostname, or '_' if we ran out. */
if (*cp1 != '\0')
{
*cp2++ = *cp1++;
}
else
{
*cp2++ = '_';
}
/* Copy a slash. */
*cp2++ = '/';
}
strcpy(cp2, hc->vhostname);
#else /* VHOST_DIRLEVELS */
httpd_realloc_str(&hc->hostdir, &hc->maxhostdir, strlen(hc->vhostname));
strcpy(hc->hostdir, hc->vhostname);
#endif /* VHOST_DIRLEVELS */
/* Prepend hostdir to the filename. */
len = strlen(hc->expnfilename);
httpd_realloc_str(&tempfilename, &maxtempfilename, len);
strcpy(tempfilename, hc->expnfilename);
httpd_realloc_str(&hc->expnfilename, &hc->maxexpnfilename, strlen(hc->hostdir) + 1 + len);
strcpy(hc->expnfilename, hc->hostdir);
strcat(hc->expnfilename, "/");
strcat(hc->expnfilename, tempfilename);
return 1;
}
#endif
/* Expands filename, deleting ..'s and leading /'s.
* Returns the expanded path (pointer to static string), or NULL on
* errors. Also returns, in the string pointed to by restP, any trailing
* parts of the path that don't exist.
*/
static char *expand_filename(char *path, char **restP, bool tildemapped)
{
static char *checked;
static char *rest;
static size_t maxchecked = 0, maxrest = 0;
size_t checkedlen;
size_t restlen;
#if 0 // REVISIT
struct stat sb;
#endif
char *r;
char *cp1;
char *cp2;
int i;
ninfo("path: \"%s\"\n", path);
#if 0 // REVISIT
/* We need to do the pathinfo check. we do a single stat() of the whole
* filename - if it exists, then we return it as is with nothing in restP.
* If it doesn't exist, we fall through to the existing code.
*/
if (stat(path, &sb) != -1)
{
checkedlen = strlen(path);
httpd_realloc_str(&checked, &maxchecked, checkedlen);
strcpy(checked, path);
/* Trim trailing slashes. */
while (checked[checkedlen - 1] == '/')
{
checked[checkedlen - 1] = '\0';
--checkedlen;
}
httpd_realloc_str(&rest, &maxrest, 0);
rest[0] = '\0';
*restP = rest;
return checked;
}
#endif /* 0 */
/* Handle leading / or . and relative paths by copying the default directory into checked */
if ((path[0] == '/' && strncmp(path, httpd_root, strlen(httpd_root)) != 0) || path[0] != '/')
{
/* Start out with httpd_root in checked. Allow space in the reallocation
* include NULL terminator and possibly a '/'
*/
checkedlen = strlen(httpd_root);
httpd_realloc_str(&checked, &maxchecked, checkedlen+2);
strcpy(checked, httpd_root);
/* Skip over leading '.' */
if (path[0] == '.')
{
path++;
}
/* Add '/' to separate relative paths */
else if (path[0] != '/')
{
checked[checkedlen] = '/';
checked[checkedlen+1] = '\0';
}
}
else
{
/* Start out with nothing in checked */
httpd_realloc_str(&checked, &maxchecked, 1);
checked[0] = '\0';
checkedlen = 0;
}
/* Copy the whole filename (minus the leading '.') into rest. */
restlen = strlen(path);
httpd_realloc_str(&rest, &maxrest, restlen+1);
strcpy(rest, path);
/* trim trailing slash */
if (rest[restlen - 1] == '/')
{
rest[--restlen] = '\0';
}
r = rest;
/* While there are still components to check... */
while (restlen > 0)
{
/* Grab one component from r and transfer it to checked. */
cp1 = strchr(r, '/');
if (cp1)
{
i = cp1 - r;
if (i == 0)
{
/* Special case for absolute paths. */
httpd_realloc_str(&checked, &maxchecked, checkedlen + 1);
strncpy(&checked[checkedlen], r, 1);
checkedlen += 1;
}
else if (strncmp(r, "..", MAX(i, 2)) == 0)
{
/* Ignore ..'s that go above the start of the path. */
if (checkedlen != 0)
{
cp2 = strrchr(checked, '/');
if (!cp2)
{
checkedlen = 0;
}
else if (cp2 == checked)
{
checkedlen = 1;
}
else
{
checkedlen = cp2 - checked;
}
}
}
else
{
httpd_realloc_str(&checked, &maxchecked, checkedlen + 1 + i);
if (checkedlen > 0 && checked[checkedlen - 1] != '/')
{
checked[checkedlen++] = '/';
}
strncpy(&checked[checkedlen], r, i);
checkedlen += i;
}
checked[checkedlen] = '\0';
r += i + 1;
restlen -= i + 1;
}
else
{
/* No slashes remaining, r is all one component. */
if (strcmp(r, "..") == 0)
{
/* Ignore ..'s that go above the start of the path. */
if (checkedlen != 0)
{
cp2 = strrchr(checked, '/');
if (!cp2)
{
checkedlen = 0;
}
else if (cp2 == checked)
{
checkedlen = 1;
}
else
{
checkedlen = cp2 - checked;
}
checked[checkedlen] = '\0';
}
}
else
{
httpd_realloc_str(&checked, &maxchecked, checkedlen + 1 + restlen);
if (checkedlen > 0 && checked[checkedlen - 1] != '/')
{
checked[checkedlen++] = '/';
}
strcpy(&checked[checkedlen], r);
checkedlen += restlen;
}
r += restlen;
restlen = 0;
}
}
/* Ok. */
*restP = r;
if (checked[0] == '\0')
{
strcpy(checked, httpd_root);
}
ninfo("checked: \"%s\"\n", checked);
return checked;
}
static char *bufgets(httpd_conn *hc)
{
int i;
char c;
for (i = hc->checked_idx; hc->checked_idx < hc->read_idx; ++hc->checked_idx)
{
c = hc->read_buf[hc->checked_idx];
if (c == '\012' || c == '\015')
{
hc->read_buf[hc->checked_idx] = '\0';
++hc->checked_idx;
if (c == '\015' && hc->checked_idx < hc->read_idx &&
hc->read_buf[hc->checked_idx] == '\012')
{
hc->read_buf[hc->checked_idx] = '\0';
++hc->checked_idx;
}
return &(hc->read_buf[i]);
}
}
return NULL;
}
static void de_dotdot(char *file)
{
char *cp;
char *cp2;
int l;
/* Collapse any multiple / sequences. */
while ((cp = strstr(file, "//")) != NULL)
{
for (cp2 = cp + 2; *cp2 == '/'; ++cp2)
{
continue;
}
strcpy(cp + 1, cp2);
}
/* Remove leading ./ and any /./ sequences. */
while (strncmp(file, "./", 2) == 0)
{
strcpy(file, file + 2);
}
while ((cp = strstr(file, "/./")) != NULL)
{
strcpy(cp, cp + 2);
}
/* Alternate between removing leading ../ and removing xxx/../ */
for (;;)
{
while (strncmp(file, "../", 3) == 0)
{
strcpy(file, file + 3);
}
cp = strstr(file, "/../");
if (!cp)
{
break;
}
for (cp2 = cp - 1; cp2 >= file && *cp2 != '/'; --cp2)
{
continue;
}
strcpy(cp2 + 1, cp + 4);
}
/* Also elide any xxx/.. at the end. */
while ((l = strlen(file)) > 3 && strcmp((cp = file + l - 3), "/..") == 0)
{
for (cp2 = cp - 1; cp2 >= file && *cp2 != '/'; --cp2)
{
continue;
}
if (cp2 < file)
{
break;
}
*cp2 = '\0';
}
}
static void init_mime(void)
{
int i;
/* Fill in the lengths. */
for (i = 0; i < n_enc_tab; ++i)
{
enc_tab[i].ext_len = strlen(enc_tab[i].ext);
enc_tab[i].val_len = strlen(enc_tab[i].val);
}
for (i = 0; i < n_typ_tab; ++i)
{
typ_tab[i].ext_len = strlen(typ_tab[i].ext);
typ_tab[i].val_len = strlen(typ_tab[i].val);
}
}
/* Figure out MIME encodings and type based on the filename. Multiple
* encodings are separated by commas, and are listed in the order in
* which they were applied to the file.
*/
static void figure_mime(httpd_conn *hc)
{
char *prev_dot;
char *dot;
char *ext;
int me_indexes[100], n_me_indexes;
size_t ext_len, encodings_len;
int i, top, bot, mid;
int r;
char *default_type = "text/plain; charset=%s";
/* Peel off encoding extensions until there aren't any more. */
n_me_indexes = 0;
for (prev_dot = &hc->expnfilename[strlen(hc->expnfilename)];; prev_dot = dot)
{
for (dot = prev_dot - 1; dot >= hc->expnfilename && *dot != '.'; --dot)
;
if (dot < hc->expnfilename)
{
/* No dot found. No more encoding extensions, and no type
* extension either.
*/
hc->type = default_type;
goto done;
}
ext = dot + 1;
ext_len = prev_dot - ext;
/* Search the encodings table. Linear search is fine here, there are
* only a few entries.
*/
for (i = 0; i < n_enc_tab; ++i)
{
if (ext_len == enc_tab[i].ext_len &&
strncasecmp(ext, enc_tab[i].ext, ext_len) == 0)
{
if (n_me_indexes < sizeof(me_indexes) / sizeof(*me_indexes))
{
me_indexes[n_me_indexes] = i;
++n_me_indexes;
}
goto next;
}
}
/* No encoding extension found. Break and look for a type extension. */
break;
next:;
}
/* Binary search for a matching type extension. */
top = n_typ_tab - 1;
bot = 0;
while (top >= bot)
{
mid = (top + bot) / 2;
r = strncasecmp(ext, typ_tab[mid].ext, ext_len);
if (r < 0)
{
top = mid - 1;
}
else if (r > 0)
{
bot = mid + 1;
}
else if (ext_len < typ_tab[mid].ext_len)
{
top = mid - 1;
}
else if (ext_len > typ_tab[mid].ext_len)
{
bot = mid + 1;
}
else
{
hc->type = typ_tab[mid].val;
goto done;
}
}
hc->type = default_type;
done:
/* The last thing we do is actually generate the mime-encoding header. */
hc->encodings[0] = '\0';
encodings_len = 0;
for (i = n_me_indexes - 1; i >= 0; --i)
{
httpd_realloc_str(&hc->encodings, &hc->maxencodings,
encodings_len + enc_tab[me_indexes[i]].val_len + 1);
if (hc->encodings[0] != '\0')
{
strcpy(&hc->encodings[encodings_len], ",");
++encodings_len;
}
strcpy(&hc->encodings[encodings_len], enc_tab[me_indexes[i]].val);
encodings_len += enc_tab[me_indexes[i]].val_len;
}
}
/* qsort comparison routine. */
#ifdef CONFIG_THTTPD_GENERATE_INDICES
static int name_compare(FAR const void *a, FAR const void *b)
{
return strcmp(*((FAR char **)a), *((FAR char **)b));
}
static void ls_child(int argc, char **argv)
{
FAR httpd_conn *hc = (FAR httpd_conn*)strtoul(argv[1], NULL, 16);
DIR *dirp;
struct dirent *de;
int namlen;
static int maxnames = 0;
int oldmax;
int nnames;
static char *names;
static char **nameptrs;
static char *name;
static size_t maxname = 0;
static char *rname;
static size_t maxrname = 0;
static char *encrname;
static size_t maxencrname = 0;
FILE *fp;
struct stat sb;
char modestr[20];
char *linkprefix;
#if 0
char link[PATH_MAX + 1];
#else
char link[1];
#endif
char *fileclass;
time_t now;
char *timestr;
int i;
httpd_unlisten(hc->hs);
send_mime(hc, 200, ok200title, "", "", "text/html; charset=%s",
(off_t) - 1, hc->sb.st_mtime);
httpd_write_response(hc);
/* Open a stdio stream so that we can use fprintf, which is more
* efficient than a bunch of separate write()s. We don't have to
* worry about double closes or file descriptor leaks cause we're
* in a sub-task.
*/
fp = fdopen(hc->conn_fd, "w");
if (fp == NULL)
{
nerr("ERROR: fdopen: %d\n", errno);
INTERNALERROR("fdopen");
httpd_send_err(hc, 500, err500title, "", err500form, hc->encodedurl);
httpd_write_response(hc);
closedir(dirp);
exit(1);
}
fputs(html_html, fp);
fputs(html_hdtitle, fp);
fprintf(fp, "Index of %s", hc->encodedurl, hc->encodedurl);
fputs(html_titlehd, fp);
fputs(html_body, fp);
fputs(html_hdr2, fp);
fprintf(fp, "Index of %s", hc->encodedurl, hc->encodedurl);
fputs(html_endhdr2, fp);
fputs(html_crlf, fp);
fputs("<PRE>\r\nmode links bytes last-changed name\r\n<HR>", fp);
/* Read in names. */
nnames = 0;
while ((de = readdir(dirp)) != 0) /* dirent or direct */
{
if (nnames >= maxnames)
{
if (maxnames == 0)
{
maxnames = 100;
names = NEW(char, maxnames * (PATH_MAX + 1));
nameptrs = NEW(char*, maxnames);
}
else
{
oldmax = maxnames;
maxnames *= 2;
names = RENEW(names, char, oldmax*(PATH_MAX+1), maxnames*(PATH_MAX + 1));
nameptrs = RENEW(nameptrs, char*, oldmax, maxnames);
}
if (!names || !nameptrs)
{
nerr("ERROR: out of memory reallocating directory names\n");
exit(1);
}
for (i = 0; i < maxnames; ++i)
{
nameptrs[i] = &names[i * (PATH_MAX + 1)];
}
}
namlen = NAMLEN(de);
strncpy(nameptrs[nnames], de->d_name, namlen);
nameptrs[nnames][namlen] = '\0';
++nnames;
}
closedir(dirp);
/* Sort the names. */
qsort(nameptrs, nnames, sizeof(*nameptrs), name_compare);
/* Generate output. */
for (i = 0; i < nnames; ++i)
{
httpd_realloc_str(&name, &maxname,
strlen(hc->expnfilename) + 1 +
strlen(nameptrs[i]));
httpd_realloc_str(&rname, &maxrname,
strlen(hc->origfilename) + 1 +
strlen(nameptrs[i]));
if (hc->expnfilename[0] == '\0' || strcmp(hc->expnfilename, ".") == 0)
{
strcpy(name, nameptrs[i]);
strcpy(rname, nameptrs[i]);
}
else
{
snprintf(name, maxname, "%s/%s", hc->expnfilename, nameptrs[i]);
if (strcmp(hc->origfilename, ".") == 0)
{
snprintf(rname, maxrname, "%s", nameptrs[i]);
}
else
{
snprintf(rname, maxrname, "%s%s", hc->origfilename, nameptrs[i]);
}
}
httpd_realloc_str(&encrname, &maxencrname, 3 * strlen(rname) + 1);
httpd_strencode(encrname, maxencrname, rname);
if (stat(name, &sb) < 0)
{
continue;
}
linkprefix = "";
link[0] = '\0';
/* Break down mode word. First the file type. */
switch (sb.st_mode & S_IFMT)
{
case S_IFIFO:
modestr[0] = 'p';
break;
case S_IFCHR:
modestr[0] = 'c';
break;
case S_IFDIR:
modestr[0] = 'd';
break;
case S_IFBLK:
modestr[0] = 'b';
break;
case S_IFREG:
modestr[0] = '-';
break;
case S_IFSOCK:
modestr[0] = 's';
break;
case S_IFLNK:
default:
modestr[0] = '?';
break;
}
/* Now the world permissions. Owner and group permissions are
* not of interest to web clients.
*/
modestr[1] = (sb.st_mode & S_IROTH) ? 'r' : '-';
modestr[2] = (sb.st_mode & S_IWOTH) ? 'w' : '-';
modestr[3] = (sb.st_mode & S_IXOTH) ? 'x' : '-';
modestr[4] = '\0';
/* We also leave out the owner and group name */
/* Get time string. */
now = time(NULL);
timestr = ctime(&sb.st_mtime);
timestr[0] = timestr[4];
timestr[1] = timestr[5];
timestr[2] = timestr[6];
timestr[3] = ' ';
timestr[4] = timestr[8];
timestr[5] = timestr[9];
timestr[6] = ' ';
if (now - sb.st_mtime > 60 * 60 * 24 * 182) /* 1/2 year */
{
timestr[7] = ' ';
timestr[8] = timestr[20];
timestr[9] = timestr[21];
timestr[10] = timestr[22];
timestr[11] = timestr[23];
}
else
{
timestr[7] = timestr[11];
timestr[8] = timestr[12];
timestr[9] = ':';
timestr[10] = timestr[14];
timestr[11] = timestr[15];
}
timestr[12] = '\0';
/* The ls -F file class. */
switch (sb.st_mode & S_IFMT)
{
case S_IFDIR:
fileclass = "/";
break;
case S_IFSOCK:
fileclass = "=";
break;
case S_IFLNK:
fileclass = "@";
break;
default:
fileclass = (sb.st_mode & S_IXOTH) ? "*" : "";
break;
}
/* And print. */
fprintf(fp,
"%s %3ld %10lld %s <A HREF=\"/%.500s%s\">%s</A>%s%s%s\n",
modestr, 0, (int16_t)sb.st_size, timestr, encrname,
S_ISDIR(sb.st_mode) ? "/" : "", nameptrs[i], linkprefix,
link, fileclass);
}
fputs("</PRE>", fp);
fputs(html_endbody, fp);
fputs(html_endhtml, fp);
fclose(fp);
exit(0);
}
static int ls(httpd_conn *hc)
{
DIR *dirp;
int child;
char arg[16];
char *argv[1];
#if CONFIG_THTTPD_CGI_TIMELIMIT > 0
ClientData client_data;
#endif
dirp = opendir(hc->expnfilename);
if (dirp == NULL)
{
nerr("ERROR: opendir %s: %d\n", hc->expnfilename, errno);
httpd_send_err(hc, 404, err404title, "", err404form, hc->encodedurl);
return -1;
}
if (hc->method == METHOD_HEAD)
{
closedir(dirp);
send_mime(hc, 200, ok200title, "", "", "text/html; charset=%s",
(off_t) - 1, hc->sb.st_mtime);
}
else if (hc->method == METHOD_GET)
{
#ifdef CONFIG_THTTPD_CGILIMIT
if (hc->hs->cgi_count >= CONFIG_THTTPD_CGILIMIT)
{
closedir(dirp);
httpd_send_err(hc, 503, httpd_err503title, "", httpd_err503form,
hc->encodedurl);
return -1;
}
#endif
++hc->hs->cgi_count;
/* Start the child task. */
snprintf(arg, 16, "%p", hc); /* task_create doesn't handle binary arguments. */
argv[0] = arg;
child = task_create("CGI child", CONFIG_THTTPD_CGI_PRIORITY,
CONFIG_THTTPD_CGI_STACKSIZE,
(main_t)ls_child, (FAR char * const *)argv);
if (child < 0)
{
nerr("ERROR: task_create: %d\n", errno);
closedir(dirp);
INTERNALERROR("task_create");
httpd_send_err(hc, 500, err500title, "", err500form, hc->encodedurl);
return -1;
}
closedir(dirp);
nerr("ERROR: spawned indexing task %d for directory '%s'\n",
child, hc->expnfilename);
/* Schedule a kill for the child task, in case it runs too long */
#if CONFIG_THTTPD_CGI_TIMELIMIT > 0
client_data.i = child;
if (tmr_create(NULL, cgi_kill, client_data, CONFIG_THTTPD_CGI_TIMELIMIT * 1000L, 0) == NULL)
{
nerr("ERROR: tmr_create(cgi_kill ls) failed\n");
exit(1);
}
#endif
hc->bytes_sent = CONFIG_THTTPD_CGI_BYTECOUNT;
hc->should_linger = false;
}
else
{
closedir(dirp);
NOTIMPLEMENTED(httpd_method_str(hc->method));
httpd_send_err(hc, 501, err501title, "", err501form, httpd_method_str(hc->method));
return -1;
}
return 0;
}
#endif /* CONFIG_THTTPD_GENERATE_INDICES */
/* Returns 1 if ok to serve the url, 0 if not. */
static int check_referer(httpd_conn *hc)
{
/* Are we doing referer checking at all? */
#ifdef CONFIG_THTTPD_URLPATTERN
char *cp;
int r;
int child;
child = really_check_referer(hc);
if (!r)
{
#ifdef CONFIG_THTTPD_VHOST
if (hc->vhostname != NULL)
{
cp = hc->vhostname;
}
else
#endif
{
cp = hc->hs->hostname;
}
if (cp == NULL)
{
cp = "";
}
ninfo("%s non-local referer \"%s%s\" \"%s\"\n",
httpd_ntoa(&hc->client_addr), cp, hc->encodedurl, hc->referer);
httpd_send_err(hc, 403, err403title, "",
ERROR_FORM(err403form,
"You must supply a local referer to get URL '%s' from this server.\n"),
hc->encodedurl);
}
return r;
#else /* CONFIG_THTTPD_URLPATTERN */
return 1;
#endif /* CONFIG_THTTPD_URLPATTERN */
}
/* Returns 1 if ok to serve the url, 0 if not. */
#ifdef CONFIG_THTTPD_URLPATTERN
static int really_check_referer(httpd_conn *hc)
{
httpd_server *hs;
char *cp1;
char *cp2;
char *cp3;
static char *refhost = NULL;
static size_t refhost_size = 0;
char *lp;
hs = hc->hs;
/* Check for an empty referer. */
if (hc->referer == NULL || hc->referer[0] == '\0' ||
(cp1 = strstr(hc->referer, "//")) == NULL)
{
/* Disallow if the url matches. */
if (match(CONFIG_THTTPD_URLPATTERN, hc->origfilename))
{
return 0;
}
/* Otherwise ok. */
return 1;
}
/* Extract referer host. */
cp1 += 2;
for (cp2 = cp1; *cp2 != '/' && *cp2 != ':' && *cp2 != '\0'; ++cp2)
{
continue;
}
httpd_realloc_str(&refhost, &refhost_size, cp2 - cp1);
for (cp3 = refhost; cp1 < cp2; ++cp1, ++cp3)
if (isupper(*cp1))
{
*cp3 = tolower(*cp1);
}
else
{
*cp3 = *cp1;
}
*cp3 = '\0';
/* Local pattern? */
#ifdef CONFIG_THTTPD_LOCALPATTERN
lp = CONFIG_THTTPD_LOCALPATTERN;
#else
/* No local pattern. What's our hostname? */
#ifndef CONFIG_THTTPD_VHOST
/* Not vhosting, use the server name. */
lp = hs->hostname;
if (!lp)
{
/* Couldn't figure out local hostname - give up. */
return 1;
}
#else
/* We are vhosting, use the hostname on this connection. */
lp = hc->vhostname;
if (!lp)
{
/* Oops, no hostname. Maybe it's an old browser that doesn't
* send a Host: header. We could figure out the default
* hostname for this IP address, but it's not worth it for the
* few requests like this.
*/
return 1;
}
#endif /* CONFIG_THTTPD_VHOST */
#endif /* CONFIG_THTTPD_LOCALPATTERN */
/* If the referer host doesn't match the local host pattern, and the
* filename does match the url pattern, it's an illegal reference.
*/
if (!match(lp, refhost) && match(CONFIG_THTTPD_URLPATTERN, hc->origfilename))
{
return 0;
}
/* Otherwise ok. */
return 1;
}
#endif /* CONFIG_THTTPD_URLPATTERN */
#ifdef CONFIG_DEBUG_FEATURES_FEATURES
static int sockaddr_check(httpd_sockaddr *saP)
{
switch (saP->sin_family)
{
case AF_INET:
return 1;
#ifdef CONFIG_NET_IPv6
case AF_INET6:
return 1;
#endif
default:
return 0;
}
}
#endif /* CONFIG_DEBUG_FEATURES_FEATURES */
static size_t sockaddr_len(httpd_sockaddr *saP)
{
switch (saP->sin_family)
{
case AF_INET:
return sizeof(struct sockaddr_in);
#ifdef CONFIG_NET_IPv6
case AF_INET6:
return sizeof(struct sockaddr_in6);
#endif
default:
break;
}
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
FAR httpd_server *httpd_initialize(FAR httpd_sockaddr *sa)
{
FAR httpd_server *hs;
/* Save the PID of the main thread */
main_thread = getpid();
/* Allocate the server structure */
hs = (FAR httpd_server *)zalloc(sizeof(httpd_server));
if (!hs)
{
nerr("ERROR: out of memory allocating an httpd_server\n");
return NULL;
}
#ifdef CONFIG_THTTPD_HOSTNAME
hs->hostname = httpd_strdup(CONFIG_THTTPD_HOSTNAME);
#else
hs->hostname = httpd_strdup(httpd_ntoa(sa));
#endif
ninfo("hostname: %s\n", hs->hostname);
if (!hs->hostname)
{
nerr("ERROR: out of memory copying hostname\n");
return NULL;
}
hs->cgi_count = 0;
/* Initialize listen sockets */
hs->listen_fd = initialize_listen_socket(sa);
if (hs->listen_fd == -1)
{
nerr("ERROR: Failed to create listen socket\n");
free_httpd_server(hs);
return NULL;
}
init_mime();
/* Done initializing. */
ninfo("%s starting on port %d\n", CONFIG_THTTPD_SERVER_SOFTWARE, (int)CONFIG_THTTPD_PORT);
return hs;
}
void httpd_terminate(httpd_server * hs)
{
httpd_unlisten(hs);
free_httpd_server(hs);
}
void httpd_unlisten(httpd_server * hs)
{
if (hs->listen_fd != -1)
{
close(hs->listen_fd);
hs->listen_fd = -1;
}
}
/* Send the buffered response. */
void httpd_write_response(httpd_conn *hc)
{
/* If we are in a sub-task, turn off no-delay mode. */
if (main_thread != getpid())
{
httpd_clear_ndelay(hc->conn_fd);
}
/* Send the response, if necessary. */
if (hc->buflen > 0)
{
httpd_write(hc->conn_fd, hc->buffer, hc->buflen);
hc->buflen = 0;
}
}
/* Set no-delay / non-blocking mode on a socket. */
void httpd_set_ndelay(int fd)
{
int flags, newflags;
flags = fcntl(fd, F_GETFL, 0);
if (flags != -1)
{
newflags = flags | (int)O_NDELAY;
if (newflags != flags)
fcntl(fd, F_SETFL, newflags);
}
}
/* Clear no-delay / non-blocking mode on a socket. */
void httpd_clear_ndelay(int fd)
{
int flags, newflags;
flags = fcntl(fd, F_GETFL, 0);
if (flags != -1)
{
newflags = flags & ~(int)O_NDELAY;
if (newflags != flags)
{
fcntl(fd, F_SETFL, newflags);
}
}
}
void httpd_send_err(httpd_conn *hc, int status, const char *title, const char *extraheads,
const char *form, const char *arg)
{
#ifdef CONFIG_THTTPD_ERROR_DIRECTORY
char filename[1000];
/* Try virtual host error page. */
ninfo("title: \"%s\" form: \"%s\"\n", title, form);
#ifdef CONFIG_THTTPD_VHOST
if (hc->hostdir[0] != '\0')
{
snprintf(filename, sizeof(filename),
"%s/%s/err%d.html", hc->hostdir, CONFIG_THTTPD_ERROR_DIRECTORY, status);
if (send_err_file(hc, status, title, extraheads, filename))
{
ninfo("Sent VHOST error file\n");
return;
}
}
#endif /* CONFIG_THTTPD_VHOST */
/* Try server-wide error page. */
snprintf(filename, sizeof(filename), "%s/err%d.html", CONFIG_THTTPD_ERROR_DIRECTORY, status);
if (send_err_file(hc, status, title, extraheads, filename))
{
ninfo("Sent server-wide error page\n");
return;
}
/* Fall back on built-in error page. */
send_response(hc, status, title, extraheads, form, arg);
#else /* CONFIG_THTTPD_ERROR_DIRECTORY */
send_response(hc, status, title, extraheads, form, arg);
#endif /* CONFIG_THTTPD_ERROR_DIRECTORY */
}
const char *httpd_method_str(int method)
{
switch (method)
{
case METHOD_GET:
return "GET";
case METHOD_HEAD:
return "HEAD";
case METHOD_POST:
return "POST";
default:
return "UNKNOWN";
}
}
int httpd_get_conn(httpd_server *hs, int listen_fd, httpd_conn *hc)
{
httpd_sockaddr sa;
socklen_t sz;
if (!hc->initialized)
{
hc->read_size = 0;
httpd_realloc_str(&hc->read_buf, &hc->read_size, CONFIG_THTTPD_IOBUFFERSIZE);
hc->maxdecodedurl =
hc->maxorigfilename = hc->maxexpnfilename = hc->maxencodings =
hc->maxpathinfo = hc->maxquery = hc->maxaccept =
hc->maxaccepte = hc->maxreqhost = hc->maxhostdir =
hc->maxremoteuser = 0;
#ifdef CONFIG_THTTPD_TILDE_MAP2
hc->maxaltdir = 0;
#endif
httpd_realloc_str(&hc->decodedurl, &hc->maxdecodedurl, 1);
httpd_realloc_str(&hc->origfilename, &hc->maxorigfilename, 1);
httpd_realloc_str(&hc->expnfilename, &hc->maxexpnfilename, 0);
httpd_realloc_str(&hc->encodings, &hc->maxencodings, 0);
httpd_realloc_str(&hc->pathinfo, &hc->maxpathinfo, 0);
httpd_realloc_str(&hc->query, &hc->maxquery, 0);
httpd_realloc_str(&hc->accept, &hc->maxaccept, 0);
httpd_realloc_str(&hc->accepte, &hc->maxaccepte, 0);
httpd_realloc_str(&hc->reqhost, &hc->maxreqhost, 0);
httpd_realloc_str(&hc->hostdir, &hc->maxhostdir, 0);
httpd_realloc_str(&hc->remoteuser, &hc->maxremoteuser, 0);
#ifdef CONFIG_THTTPD_TILDE_MAP2
httpd_realloc_str(&hc->altdir, &hc->maxaltdir, 0);
#endif
hc->initialized = 1;
}
/* Accept the new connection. */
ninfo("accept() new connection on listen_fd %d\n", listen_fd);
sz = sizeof(sa);
hc->conn_fd = accept(listen_fd, (struct sockaddr*)&sa, &sz);
if (hc->conn_fd < 0)
{
if (errno == EWOULDBLOCK)
{
return GC_NO_MORE;
}
nerr("ERROR: accept failed: %d\n", errno);
return GC_FAIL;
}
#ifdef CONFIG_DEBUG_FEATURES_FEATURES
if (!sockaddr_check(&sa))
{
nerr("ERROR: unknown sockaddr family\n");
close(hc->conn_fd);
hc->conn_fd = -1;
return GC_FAIL;
}
#endif
hc->hs = hs;
memset(&hc->client_addr, 0, sizeof(hc->client_addr));
memmove(&hc->client_addr, &sa, sockaddr_len(&sa));
hc->read_idx = 0;
hc->checked_idx = 0;
hc->checked_state = CHST_FIRSTWORD;
hc->method = METHOD_UNKNOWN;
hc->bytes_to_send = 0;
hc->bytes_sent = 0;
hc->encodedurl = "";
hc->decodedurl[0] = '\0';
hc->protocol = "UNKNOWN";
hc->origfilename[0] = '\0';
hc->expnfilename[0] = '\0';
hc->encodings[0] = '\0';
hc->pathinfo[0] = '\0';
hc->query[0] = '\0';
hc->referer = "";
hc->useragent = "";
hc->accept[0] = '\0';
hc->accepte[0] = '\0';
hc->acceptl = "";
hc->cookie = "";
hc->contenttype = "";
hc->reqhost[0] = '\0';
hc->hdrhost = "";
hc->hostdir[0] = '\0';
hc->authorization = "";
hc->remoteuser[0] = '\0';
hc->buffer[0] = '\0';
#ifdef CONFIG_THTTPD_TILDE_MAP2
hc->altdir[0] = '\0';
#endif
hc->buflen = 0;
hc->if_modified_since = (time_t) - 1;
hc->range_if = (time_t)-1;
hc->contentlength = -1;
hc->type = "";
#ifdef CONFIG_THTTPD_VHOST
hc->vhostname = NULL;
#endif
hc->mime_flag = true;
hc->one_one = false;
hc->got_range = false;
hc->tildemapped = false;
hc->range_start = 0;
hc->range_end = -1;
hc->keep_alive = false;
hc->should_linger = false;
hc->file_fd = -1;
ninfo("New connection accepted on %d\n", hc->conn_fd);
return GC_OK;
}
/* Checks hc->read_buf to see whether a complete request has been read so far;
* either the first line has two words (an HTTP/0.9 request), or the first
* line has three words and there's a blank line present.
*
* hc->read_idx is how much has been read in; hc->checked_idx is how much we
* have checked so far; and hc->checked_state is the current state of the
* finite state machine.
*/
int httpd_got_request(httpd_conn *hc)
{
char c;
for (; hc->checked_idx < hc->read_idx; ++hc->checked_idx)
{
c = hc->read_buf[hc->checked_idx];
switch (hc->checked_state)
{
case CHST_FIRSTWORD:
switch (c)
{
case ' ':
case '\t':
hc->checked_state = CHST_FIRSTWS;
break;
case '\012':
case '\015':
hc->checked_state = CHST_BOGUS;
return GR_BAD_REQUEST;
}
break;
case CHST_FIRSTWS:
switch (c)
{
case ' ':
case '\t':
break;
case '\012':
case '\015':
hc->checked_state = CHST_BOGUS;
return GR_BAD_REQUEST;
default:
hc->checked_state = CHST_SECONDWORD;
break;
}
break;
case CHST_SECONDWORD:
switch (c)
{
case ' ':
case '\t':
hc->checked_state = CHST_SECONDWS;
break;
case '\012':
case '\015':
/* The first line has only two words - an HTTP/0.9 request. */
return GR_GOT_REQUEST;
}
break;
case CHST_SECONDWS:
switch (c)
{
case ' ':
case '\t':
break;
case '\012':
case '\015':
hc->checked_state = CHST_BOGUS;
return GR_BAD_REQUEST;
default:
hc->checked_state = CHST_THIRDWORD;
break;
}
break;
case CHST_THIRDWORD:
switch (c)
{
case ' ':
case '\t':
hc->checked_state = CHST_THIRDWS;
break;
case '\012':
hc->checked_state = CHST_LF;
break;
case '\015':
hc->checked_state = CHST_CR;
break;
}
break;
case CHST_THIRDWS:
switch (c)
{
case ' ':
case '\t':
break;
case '\012':
hc->checked_state = CHST_LF;
break;
case '\015':
hc->checked_state = CHST_CR;
break;
default:
hc->checked_state = CHST_BOGUS;
return GR_BAD_REQUEST;
}
break;
case CHST_LINE:
switch (c)
{
case '\012':
hc->checked_state = CHST_LF;
break;
case '\015':
hc->checked_state = CHST_CR;
break;
}
break;
case CHST_LF:
switch (c)
{
case '\012':
/* Two newlines in a row - a blank line - end of request. */
return GR_GOT_REQUEST;
case '\015':
hc->checked_state = CHST_CR;
break;
default:
hc->checked_state = CHST_LINE;
break;
}
break;
case CHST_CR:
switch (c)
{
case '\012':
hc->checked_state = CHST_CRLF;
break;
case '\015':
/* Two returns in a row - end of request. */
return GR_GOT_REQUEST;
default:
hc->checked_state = CHST_LINE;
break;
}
break;
case CHST_CRLF:
switch (c)
{
case '\012':
/* Two newlines in a row - end of request. */
return GR_GOT_REQUEST;
case '\015':
hc->checked_state = CHST_CRLFCR;
break;
default:
hc->checked_state = CHST_LINE;
break;
}
break;
case CHST_CRLFCR:
switch (c)
{
case '\012':
case '\015':
/* Two CRLFs or two CRs in a row - end of request. */
return GR_GOT_REQUEST;
default:
hc->checked_state = CHST_LINE;
break;
}
break;
case CHST_BOGUS:
return GR_BAD_REQUEST;
}
}
return GR_NO_REQUEST;
}
int httpd_parse_request(httpd_conn *hc)
{
char *buf;
char *method_str;
char *url;
char *protocol;
char *reqhost;
char *eol;
char *cp;
char *pi;
hc->checked_idx = 0; /* reset */
method_str = bufgets(hc);
ninfo("method_str: \"%s\"\n", method_str);
url = strpbrk(method_str, " \t\012\015");
if (!url)
{
BADREQUEST("url-1");
httpd_send_err(hc, 400, httpd_err400title, "", httpd_err400form, "");
return -1;
}
*url++ = '\0';
url += strspn(url, " \t\012\015");
ninfo("url: \"%s\"\n", url);
protocol = strpbrk(url, " \t\012\015");
ninfo("protocol: \"%s\"\n", protocol ? protocol : "<null>");
if (!protocol)
{
protocol = "HTTP/0.9";
hc->mime_flag = false;
}
else
{
*protocol++ = '\0';
protocol += strspn(protocol, " \t\012\015");
if (*protocol != '\0')
{
eol = strpbrk(protocol, " \t\012\015");
if (eol)
{
*eol = '\0';
}
if (strcasecmp(protocol, "HTTP/1.0") != 0)
{
hc->one_one = true;
}
}
}
hc->protocol = protocol;
/* Check for HTTP/1.1 absolute URL. */
if (strncasecmp(url, "http://", 7) == 0)
{
if (!hc->one_one)
{
BADREQUEST("one_one");
httpd_send_err(hc, 400, httpd_err400title, "", httpd_err400form, "");
return -1;
}
reqhost = url + 7;
url = strchr(reqhost, '/');
if (!url)
{
BADREQUEST("reqhost-1");
httpd_send_err(hc, 400, httpd_err400title, "", httpd_err400form, "");
return -1;
}
*url = '\0';
if (strchr(reqhost, '/') != NULL || reqhost[0] == '.')
{
BADREQUEST("reqhost-2");
httpd_send_err(hc, 400, httpd_err400title, "", httpd_err400form, "");
return -1;
}
httpd_realloc_str(&hc->reqhost, &hc->maxreqhost, strlen(reqhost));
strcpy(hc->reqhost, reqhost);
*url = '/';
}
if (*url != '/')
{
BADREQUEST("url-2");
httpd_send_err(hc, 400, httpd_err400title, "", httpd_err400form, "");
return -1;
}
if (strcasecmp(method_str, httpd_method_str(METHOD_GET)) == 0)
{
hc->method = METHOD_GET;
}
else if (strcasecmp(method_str, httpd_method_str(METHOD_HEAD)) == 0)
{
hc->method = METHOD_HEAD;
}
else if (strcasecmp(method_str, httpd_method_str(METHOD_POST)) == 0)
{
hc->method = METHOD_POST;
}
else
{
NOTIMPLEMENTED(method_str);
httpd_send_err(hc, 501, err501title, "", err501form, method_str);
return -1;
}
hc->encodedurl = url;
httpd_realloc_str(&hc->decodedurl, &hc->maxdecodedurl, strlen(hc->encodedurl));
httpd_strdecode(hc->decodedurl, hc->encodedurl);
httpd_realloc_str(&hc->origfilename, &hc->maxorigfilename, strlen(hc->decodedurl));
strcpy(hc->origfilename, &hc->decodedurl[1]);
/* Special case for top-level URL. */
if (hc->origfilename[0] == '\0')
{
strcpy(hc->origfilename, ".");
}
/* Extract query string from encoded URL. */
cp = strchr(hc->encodedurl, '?');
if (cp)
{
++cp;
httpd_realloc_str(&hc->query, &hc->maxquery, strlen(cp));
strcpy(hc->query, cp);
/* Remove query from (decoded) origfilename. */
cp = strchr(hc->origfilename, '?');
if (cp)
{
*cp = '\0';
}
}
de_dotdot(hc->origfilename);
if (hc->origfilename[0] == '/' ||
(hc->origfilename[0] == '.' && hc->origfilename[1] == '.' &&
(hc->origfilename[2] == '\0' || hc->origfilename[2] == '/')))
{
BADREQUEST("origfilename");
httpd_send_err(hc, 400, httpd_err400title, "", httpd_err400form, "");
return -1;
}
if (hc->mime_flag)
{
/* Read the MIME headers. */
while ((buf = bufgets(hc)) != NULL)
{
if (buf[0] == '\0')
{
break;
}
if (strncasecmp(buf, "Referer:", 8) == 0)
{
cp = &buf[8];
cp += strspn(cp, " \t");
hc->referer = cp;
}
else if (strncasecmp(buf, "User-Agent:", 11) == 0)
{
cp = &buf[11];
cp += strspn(cp, " \t");
hc->useragent = cp;
}
else if (strncasecmp(buf, "Host:", 5) == 0)
{
cp = &buf[5];
cp += strspn(cp, " \t");
hc->hdrhost = cp;
cp = strchr(hc->hdrhost, ':');
if (cp)
{
*cp = '\0';
}
if (strchr(hc->hdrhost, '/') != NULL || hc->hdrhost[0] == '.')
{
BADREQUEST("hdrhost");
httpd_send_err(hc, 400, httpd_err400title, "", httpd_err400form, "");
return -1;
}
}
else if (strncasecmp(buf, "Accept:", 7) == 0)
{
cp = &buf[7];
cp += strspn(cp, " \t");
if (hc->accept[0] != '\0')
{
if (strlen(hc->accept) > CONFIG_THTTPD_MAXREALLOC)
{
nerr("ERROR: %s way too much Accept: data\n",
httpd_ntoa(&hc->client_addr));
continue;
}
httpd_realloc_str(&hc->accept, &hc->maxaccept, strlen(hc->accept) + 2 + strlen(cp));
strcat(hc->accept, ", ");
}
else
{
httpd_realloc_str(&hc->accept, &hc->maxaccept, strlen(cp));
}
strcat(hc->accept, cp);
}
else if (strncasecmp(buf, "Accept-Encoding:", 16) == 0)
{
cp = &buf[16];
cp += strspn(cp, " \t");
if (hc->accepte[0] != '\0')
{
if (strlen(hc->accepte) > CONFIG_THTTPD_MAXREALLOC)
{
nerr("ERROR: %s way too much Accept-Encoding: data\n",
httpd_ntoa(&hc->client_addr));
continue;
}
httpd_realloc_str(&hc->accepte, &hc->maxaccepte, strlen(hc->accepte) + 2 + strlen(cp));
strcat(hc->accepte, ", ");
}
else
{
httpd_realloc_str(&hc->accepte, &hc->maxaccepte, strlen(cp));
}
strcpy(hc->accepte, cp);
}
else if (strncasecmp(buf, "Accept-Language:", 16) == 0)
{
cp = &buf[16];
cp += strspn(cp, " \t");
hc->acceptl = cp;
}
else if (strncasecmp(buf, "If-Modified-Since:", 18) == 0)
{
cp = &buf[18];
hc->if_modified_since = tdate_parse(cp);
if (hc->if_modified_since == (time_t) - 1)
{
nerr("ERROR: unparsable time: %s\n", cp);
}
}
else if (strncasecmp(buf, "Cookie:", 7) == 0)
{
cp = &buf[7];
cp += strspn(cp, " \t");
hc->cookie = cp;
}
else if (strncasecmp(buf, "Range:", 6) == 0)
{
/* Only support %d- and %d-%d, not %d-%d,%d-%d or -%d. */
if (strchr(buf, ',') == NULL)
{
char *cp_dash;
cp = strpbrk(buf, "=");
if (cp)
{
cp_dash = strchr(cp + 1, '-');
if (cp_dash != NULL && cp_dash != cp + 1)
{
*cp_dash = '\0';
hc->got_range = true;
hc->range_start = atoll(cp + 1);
if (hc->range_start < 0)
{
hc->range_start = 0;
}
if (isdigit((int)cp_dash[1]))
{
hc->range_end = atoll(cp_dash + 1);
if (hc->range_end < 0)
hc->range_end = -1;
}
}
}
}
}
else if (strncasecmp(buf, "Range-If:", 9) == 0 ||
strncasecmp(buf, "If-Range:", 9) == 0)
{
cp = &buf[9];
hc->range_if = tdate_parse(cp);
if (hc->range_if == (time_t) - 1)
{
nerr("ERROR: unparsable time: %s\n", cp);
}
}
else if (strncasecmp(buf, "Content-Type:", 13) == 0)
{
cp = &buf[13];
cp += strspn(cp, " \t");
hc->contenttype = cp;
}
else if (strncasecmp(buf, "Content-Length:", 15) == 0)
{
cp = &buf[15];
hc->contentlength = atol(cp);
}
else if (strncasecmp(buf, "Authorization:", 14) == 0)
{
cp = &buf[14];
cp += strspn(cp, " \t");
hc->authorization = cp;
}
else if (strncasecmp(buf, "Connection:", 11) == 0)
{
cp = &buf[11];
cp += strspn(cp, " \t");
if (strcasecmp(cp, "keep-alive") == 0)
{
hc->keep_alive = true;
}
}
#ifdef LOG_UNKNOWN_HEADERS
else if (strncasecmp(buf, "Accept-Charset:", 15) == 0 ||
strncasecmp(buf, "Accept-Language:", 16) == 0 ||
strncasecmp(buf, "Agent:", 6) == 0 ||
strncasecmp(buf, "Cache-Control:", 14) == 0 ||
strncasecmp(buf, "Cache-Info:", 11) == 0 ||
strncasecmp(buf, "Charge-To:", 10) == 0 ||
strncasecmp(buf, "Client-IP:", 10) == 0 ||
strncasecmp(buf, "Date:", 5) == 0 ||
strncasecmp(buf, "Extension:", 10) == 0 ||
strncasecmp(buf, "Forwarded:", 10) == 0 ||
strncasecmp(buf, "From:", 5) == 0 ||
strncasecmp(buf, "HTTP-Version:", 13) == 0 ||
strncasecmp(buf, "Max-Forwards:", 13) == 0 ||
strncasecmp(buf, "Message-Id:", 11) == 0 ||
strncasecmp(buf, "MIME-Version:", 13) == 0 ||
strncasecmp(buf, "Negotiate:", 10) == 0 ||
strncasecmp(buf, "Pragma:", 7) == 0 ||
strncasecmp(buf, "Proxy-Agent:", 12) == 0 ||
strncasecmp(buf, "Proxy-Connection:", 17) == 0 ||
strncasecmp(buf, "Security-Scheme:", 16) == 0 ||
strncasecmp(buf, "Session-Id:", 11) == 0 ||
strncasecmp(buf, "UA-Color:", 9) == 0 ||
strncasecmp(buf, "UA-CPU:", 7) == 0 ||
strncasecmp(buf, "UA-Disp:", 8) == 0 ||
strncasecmp(buf, "UA-OS:", 6) == 0 ||
strncasecmp(buf, "UA-Pixels:", 10) == 0 ||
strncasecmp(buf, "User:", 5) == 0 ||
strncasecmp(buf, "Via:", 4) == 0 ||
strncasecmp(buf, "X-", 2) == 0)
; /* ignore */
else
{
nwarn("WARNING: unknown request header: %s\n", buf);
}
#endif /* LOG_UNKNOWN_HEADERS */
}
}
if (hc->one_one)
{
/* Check that HTTP/1.1 requests specify a host, as required. */
if (hc->reqhost[0] == '\0' && hc->hdrhost[0] == '\0')
{
BADREQUEST("reqhost-3");
httpd_send_err(hc, 400, httpd_err400title, "", httpd_err400form, "");
return -1;
}
/* If the client wants to do keep-alive, it might also be doing
* pipelining. There's no way for us to tell. Since we don't
* implement keep-alive yet, if we close such a connection there
* might be unread pipelined requests waiting. So, we have to do a
* lingering close.
*/
if (hc->keep_alive)
{
hc->should_linger = true;
}
}
/* Ok, the request has been parsed. Now we resolve stuff that may require
* the entire request.
*/
/* Copy original filename to expanded filename. */
httpd_realloc_str(&hc->expnfilename, &hc->maxexpnfilename,
strlen(hc->origfilename));
strcpy(hc->expnfilename, hc->origfilename);
/* Tilde mapping. */
if (hc->expnfilename[0] == '~')
{
#ifdef CONFIG_THTTPD_TILDE_MAP1
if (!httpd_tilde_map1(hc))
{
httpd_send_err(hc, 404, err404title, "", err404form, hc->encodedurl);
return -1;
}
#endif
#ifdef CONFIG_THTTPD_TILDE_MAP2
if (!httpd_tilde_map2(hc))
{
httpd_send_err(hc, 404, err404title, "", err404form, hc->encodedurl);
return -1;
}
#endif
}
/* Virtual host mapping. */
#ifdef CONFIG_THTTPD_VHOST
if (!vhost_map(hc))
{
INTERNALERROR("VHOST");
httpd_send_err(hc, 500, err500title, "", err500form, hc->encodedurl);
return -1;
}
#endif
/* Expand the filename */
cp = expand_filename(hc->expnfilename, &pi, hc->tildemapped);
if (!cp)
{
INTERNALERROR(hc->expnfilename);
httpd_send_err(hc, 500, err500title, "", err500form, hc->encodedurl);
return -1;
}
httpd_realloc_str(&hc->expnfilename, &hc->maxexpnfilename, strlen(cp));
strcpy(hc->expnfilename, cp);
httpd_realloc_str(&hc->pathinfo, &hc->maxpathinfo, strlen(pi));
strcpy(hc->pathinfo, pi);
ninfo("expnfilename: \"%s\" pathinfo: \"%s\"\n", hc->expnfilename, hc->pathinfo);
/* Remove pathinfo stuff from the original filename too. */
if (hc->pathinfo[0] != '\0')
{
int i;
i = strlen(hc->origfilename) - strlen(hc->pathinfo);
if (i > 0 && strcmp(&hc->origfilename[i], hc->pathinfo) == 0)
{
hc->origfilename[i - 1] = '\0';
}
}
/* If the expanded filename is an absolute path, check that it's still
* within the current directory or the alternate directory.
*/
if (hc->expnfilename[0] == '/')
{
if (strncmp(hc->expnfilename, httpd_root, strlen(httpd_root)) == 0)
{
}
#ifdef CONFIG_THTTPD_TILDE_MAP2
else if (hc->altdir[0] != '\0' &&
(strncmp(hc->expnfilename, hc->altdir, strlen(hc->altdir)) == 0 &&
(hc->expnfilename[strlen(hc->altdir)] == '\0' ||
hc->expnfilename[strlen(hc->altdir)] == '/')))
{
}
#endif
else
{
nwarn("WARNING: %s URL \"%s\" goes outside the web tree\n",
httpd_ntoa(&hc->client_addr), hc->encodedurl);
httpd_send_err(hc, 403, err403title, "",
ERROR_FORM(err403form,
"The requested URL '%s' resolves to a file outside the permitted web server directory tree.\n"),
hc->encodedurl);
return -1;
}
}
return 0;
}
void httpd_close_conn(httpd_conn *hc)
{
if (hc->file_fd >= 0)
{
close(hc->file_fd);
hc->file_fd = -1;
}
if (hc->conn_fd >= 0)
{
close(hc->conn_fd);
hc->conn_fd = -1;
}
}
void httpd_destroy_conn(httpd_conn *hc)
{
if (hc->initialized)
{
httpd_free((void *)hc->read_buf);
httpd_free((void *)hc->decodedurl);
httpd_free((void *)hc->origfilename);
httpd_free((void *)hc->expnfilename);
httpd_free((void *)hc->encodings);
httpd_free((void *)hc->pathinfo);
httpd_free((void *)hc->query);
httpd_free((void *)hc->accept);
httpd_free((void *)hc->accepte);
httpd_free((void *)hc->reqhost);
httpd_free((void *)hc->hostdir);
httpd_free((void *)hc->remoteuser);
httpd_free((void *)hc->buffer);
#ifdef CONFIG_THTTPD_TILDE_MAP2
httpd_free((void *)hc->altdir);
#endif /*CONFIG_THTTPD_TILDE_MAP2 */
hc->initialized = 0;
}
}
int httpd_start_request(httpd_conn *hc, struct timeval *nowP)
{
static char *indexname;
static size_t maxindexname = 0;
#ifdef CONFIG_THTTPD_AUTH_FILE
static char *dirname;
static size_t maxdirname = 0;
#endif /* CONFIG_THTTPD_AUTH_FILE */
size_t expnlen, indxlen;
char *cp;
char *pi;
int i;
ninfo("File: \"%s\"\n", hc->expnfilename);
expnlen = strlen(hc->expnfilename);
if (hc->method != METHOD_GET && hc->method != METHOD_HEAD &&
hc->method != METHOD_POST)
{
NOTIMPLEMENTED("start");
httpd_send_err(hc, 501, err501title, "", err501form,
httpd_method_str(hc->method));
return -1;
}
/* Stat the file. */
if (stat(hc->expnfilename, &hc->sb) < 0)
{
INTERNALERROR(hc->expnfilename);
httpd_send_err(hc, 500, err500title, "", err500form, hc->encodedurl);
return -1;
}
/* Is it world-readable or world-executable? We check explicitly instead
* of just trying to open it, so that no one ever gets surprised by a file
* that's not set world-readable and yet somehow is readable by the HTTP
* server and therefore the *whole* world.
*/
if (!(hc->sb.st_mode & (S_IROTH | S_IXOTH)))
{
nwarn("WARNING: %s URL \"%s\" resolves to a non world-readable file\n",
httpd_ntoa(&hc->client_addr), hc->encodedurl);
httpd_send_err(hc, 403, err403title, "",
ERROR_FORM(err403form,
"The requested URL '%s' resolves to a file that is not world-readable.\n"),
hc->encodedurl);
return -1;
}
/* Is it a directory? */
if (S_ISDIR(hc->sb.st_mode))
{
/* If there's pathinfo, it's just a non-existent file. */
if (hc->pathinfo[0] != '\0')
{
httpd_send_err(hc, 404, err404title, "", err404form, hc->encodedurl);
return -1;
}
/* Special handling for directory URLs that don't end in a slash. We
* send back an explicit redirect with the slash, because otherwise
* many clients can't build relative URLs properly.
*/
if (strcmp(hc->origfilename, "") != 0 &&
strcmp(hc->origfilename, ".") != 0 &&
hc->origfilename[strlen(hc->origfilename) - 1] != '/')
{
send_dirredirect(hc);
return -1;
}
/* Check for an index file. */
for (i = 0; i < sizeof(index_names) / sizeof(char *); ++i)
{
httpd_realloc_str(&indexname, &maxindexname,
expnlen + 1 + strlen(index_names[i]));
strcpy(indexname, hc->expnfilename);
indxlen = strlen(indexname);
if (indxlen == 0 || indexname[indxlen - 1] != '/')
{
strcat(indexname, "/");
}
if (strcmp(indexname, "./") == 0)
{
indexname[0] = '\0';
}
strcat(indexname, index_names[i]);
if (stat(indexname, &hc->sb) >= 0)
{
goto got_one;
}
}
/* Nope, no index file, so it's an actual directory request. */
#ifdef CONFIG_THTTPD_GENERATE_INDICES
/* Directories must be readable for indexing. */
if (!(hc->sb.st_mode & S_IROTH))
{
nwarn("WARNING: %s URL \"%s\" tried to index a non-readable directory\n",
httpd_ntoa(&hc->client_addr), hc->encodedurl);
httpd_send_err(hc, 403, err403title, "",
ERROR_FORM(err403form,
"The requested URL '%s' resolves to a directory that has indexing disabled.\n"),
hc->encodedurl);
return -1;
}
# ifdef CONFIG_THTTPD_AUTH_FILE
/* Check authorization for this directory. */
if (auth_check(hc, hc->expnfilename) == -1)
{
return -1;
}
# endif /* CONFIG_THTTPD_AUTH_FILE */
/* Referer check. */
if (!check_referer(hc))
{
return -1;
}
/* Ok, generate an index. */
return ls(hc);
#else /* CONFIG_THTTPD_GENERATE_INDICES */
/* Indexing is disabled */
nwarn("WARNING: %s URL \"%s\" tried to index a directory with indexing disabled\n",
httpd_ntoa(&hc->client_addr), hc->encodedurl);
httpd_send_err(hc, 403, err403title, "",
ERROR_FORM(err403form,
"The requested URL '%s' is a directory, and directory indexing is disabled on this server.\n"),
hc->encodedurl);
return -1;
#endif /* CONFIG_THTTPD_GENERATE_INDICES */
got_one:
/* Got an index file. Expand again. More pathinfo means
* something went wrong.
*/
cp = expand_filename(indexname, &pi, hc->tildemapped);
if (cp == NULL || pi[0] != '\0')
{
INTERNALERROR(indexname);
httpd_send_err(hc, 500, err500title, "", err500form, hc->encodedurl);
return -1;
}
expnlen = strlen(cp);
httpd_realloc_str(&hc->expnfilename, &hc->maxexpnfilename, expnlen);
strcpy(hc->expnfilename, cp);
/* Now, is the index version world-readable or world-executable? */
if (!(hc->sb.st_mode & (S_IROTH | S_IXOTH)))
{
nwarn("WARNING: %s URL \"%s\" resolves to a non-world-readable index file\n",
httpd_ntoa(&hc->client_addr), hc->encodedurl);
httpd_send_err(hc, 403, err403title, "",
ERROR_FORM(err403form,
"The requested URL '%s' resolves to an index file that is not world-readable.\n"),
hc->encodedurl);
return -1;
}
}
/* Check authorization for this directory. */
#ifdef CONFIG_THTTPD_AUTH_FILE
httpd_realloc_str(&dirname, &maxdirname, expnlen);
strcpy(dirname, hc->expnfilename);
cp = strrchr(dirname, '/');
if (!cp)
{
strcpy(dirname, httpd_root);
}
else
{
*cp = '\0';
}
if (auth_check(hc, dirname) == -1)
{
return -1;
}
/* Check if the filename is the CONFIG_THTTPD_AUTH_FILE itself - that's verboten. */
if (expnlen == sizeof(CONFIG_THTTPD_AUTH_FILE) - 1)
{
if (strcmp(hc->expnfilename, CONFIG_THTTPD_AUTH_FILE) == 0)
{
nwarn("WARNING: %s URL \"%s\" tried to retrieve an auth file\n",
httpd_ntoa(&hc->client_addr), hc->encodedurl);
httpd_send_err(hc, 403, err403title, "",
ERROR_FORM(err403form,
"The requested URL '%s' is an authorization file, retrieving it is not permitted.\n"),
hc->encodedurl);
return -1;
}
}
else if (expnlen >= sizeof(CONFIG_THTTPD_AUTH_FILE) &&
strcmp(&(hc->expnfilename[expnlen - sizeof(CONFIG_THTTPD_AUTH_FILE) + 1]),
CONFIG_THTTPD_AUTH_FILE) == 0 &&
hc->expnfilename[expnlen - sizeof(CONFIG_THTTPD_AUTH_FILE)] == '/')
{
nwarn("WARNING: %s URL \"%s\" tried to retrieve an auth file\n",
httpd_ntoa(&hc->client_addr), hc->encodedurl);
httpd_send_err(hc, 403, err403title, "",
ERROR_FORM(err403form,
"The requested URL '%s' is an authorization file, retrieving it is not permitted.\n"),
hc->encodedurl);
return -1;
}
#endif /* CONFIG_THTTPD_AUTH_FILE */
/* Referer check. */
if (!check_referer(hc))
return -1;
/* Is it in the CGI area? */
#ifdef CONFIG_THTTPD_CGI_PATTERN
if (match(CONFIG_THTTPD_CGI_PATTERN, hc->expnfilename))
{
return cgi(hc);
}
#endif
/* It's not CGI. If it's executable or there's pathinfo, someone's trying
* to either serve or run a non-CGI file as CGI. Either case is
* prohibited.
*/
if (hc->sb.st_mode & S_IXOTH)
{
nwarn("WARNING: %s URL \"%s\" is executable but isn't CGI\n",
httpd_ntoa(&hc->client_addr), hc->encodedurl);
httpd_send_err(hc, 403, err403title, "",
ERROR_FORM(err403form,
"The requested URL '%s' resolves to a file which is marked executable but is not a CGI file; retrieving it is forbidden.\n"),
hc->encodedurl);
return -1;
}
if (hc->pathinfo[0] != '\0')
{
nwarn("WARNING: %s URL \"%s\" has pathinfo but isn't CGI\n",
httpd_ntoa(&hc->client_addr), hc->encodedurl);
httpd_send_err(hc, 403, err403title, "",
ERROR_FORM(err403form,
"The requested URL '%s' resolves to a file plus CGI-style pathinfo, but the file is not a valid CGI file.\n"),
hc->encodedurl);
return -1;
}
/* Fill in range_end, if necessary. */
if (hc->got_range &&
(hc->range_end == -1 || hc->range_end >= hc->sb.st_size))
{
hc->range_end = hc->sb.st_size - 1;
}
figure_mime(hc);
if (hc->method == METHOD_HEAD)
{
send_mime(hc, 200, ok200title, hc->encodings, "", hc->type,
hc->sb.st_size, hc->sb.st_mtime);
}
else if (hc->if_modified_since != (time_t) - 1 &&
hc->if_modified_since >= hc->sb.st_mtime)
{
send_mime(hc, 304, err304title, hc->encodings, "", hc->type, (off_t) - 1,
hc->sb.st_mtime);
}
else
{
hc->file_fd = open(hc->expnfilename, O_RDONLY);
if (hc->file_fd < 0)
{
INTERNALERROR(hc->expnfilename);
httpd_send_err(hc, 500, err500title, "", err500form, hc->encodedurl);
return -1;
}
send_mime(hc, 200, ok200title, hc->encodings, "", hc->type,
hc->sb.st_size, hc->sb.st_mtime);
}
return 0;
}
char *httpd_ntoa(httpd_sockaddr *saP)
{
#ifdef CONFIG_NET_IPv6
static char str[200];
if (getnameinfo
(&saP->sa, sockaddr_len(saP), str, sizeof(str), 0, 0,
NI_NUMERICHOST) != 0)
{
str[0] = '?';
str[1] = '\0';
}
else if (IN6_IS_ADDR_V4MAPPED(&saP->sa_in6.sin6_addr) &&
strncmp(str, "::ffff:", 7) == 0)
{
/* Elide IPv6ish prefix for IPv4 addresses. */
strcpy(str, &str[7]);
}
return str;
#else /* CONFIG_NET_IPv6 */
return inet_ntoa(saP->sin_addr);
#endif /* CONFIG_NET_IPv6 */
}
/* Read to requested buffer, accounting for interruptions and EOF */
int httpd_read(int fd, const void *buf, size_t nbytes)
{
ssize_t nread;
int ntotal;
ntotal = 0;
do
{
nread = read(fd, (char*)buf + ntotal, nbytes - ntotal);
if (nread < 0)
{
if (errno == EAGAIN)
{
usleep(100000); /* 100MS */
}
else if (errno != EINTR)
{
nerr("ERROR: Error sending: %d\n", errno);
return nread;
}
}
else
{
ntotal += nread;
}
}
while (ntotal < nbytes && nread != 0);
return ntotal;
}
/* Write the requested buffer completely, accounting for interruptions */
int httpd_write(int fd, const void *buf, size_t nbytes)
{
ssize_t nwritten;
int ntotal;
ntotal = 0;
do
{
nwritten = write(fd, (char*)buf + ntotal, nbytes - ntotal);
if (nwritten < 0)
{
if (errno == EAGAIN)
{
usleep(100000); /* 100MS */
}
else if (errno != EINTR)
{
nerr("ERROR: Error sending: %d\n", errno);
return nwritten;
}
}
else
{
ntotal += nwritten;
}
}
while (ntotal < nbytes);
return ntotal;
}
#endif /* CONFIG_THTTPD */
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