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1819 lines
48 KiB
C
1819 lines
48 KiB
C
/*
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* httpd implementation for busybox
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*
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* Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org>
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* Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
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*
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* simplify patch stolen from libbb without using strdup
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*****************************************************************************
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*
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* Typical usage:
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* for non root user
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* httpd -p 8080 -h $HOME/public_html
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* or for daemon start from rc script with uid=0:
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* httpd -u www
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* This is equivalent if www user have uid=80 to
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* httpd -p 80 -u 80 -h /www -c /etc/httpd.conf -r "Web Server Authentication"
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*
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*
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* When a url contains "cgi-bin" it is assumed to be a cgi script. The
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* server changes directory to the location of the script and executes it
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* after setting QUERY_STRING and other environment variables. If url args
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* are included in the url or as a post, the args are placed into decoded
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* environment variables. e.g. /cgi-bin/setup?foo=Hello%20World will set
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* the $CGI_foo environment variable to "Hello World" while
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* CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV enabled.
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*
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* The server can also be invoked as a url arg decoder and html text encoder
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* as follows:
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* foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World"
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* bar=`httpd -e "<Hello World>"` # encode as "%3CHello%20World%3E"
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*
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* httpd.conf has the following format:
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A:172.20. # Allow any address that begins with 172.20
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A:10.10. # Allow any address that begins with 10.10.
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A:10.10 # Allow any address that previous set and 10.100-109.X.X
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A:127.0.0.1 # Allow local loopback connections
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D:* # Deny from other IP connections
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/cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/
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/adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/
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/adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/
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.au:audio/basic # additional mime type for audio.au files
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A shortes path and D:from[^*] automaticaly sorting to top.
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All longest path can`t reset user:password if shorted protect setted.
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A/D may be as a/d or allow/deny - first char case unsensitive parsed only.
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Each subdir can have config file.
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For protect as user:pass current subdir and subpathes set from subdir config:
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/:user:pass
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if not, other subpathes for give effect must have path from httpd root
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/current_subdir_path_from_httpd_root/subpath:user:pass
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The Deny/Allow IP logic:
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1. Allow all:
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The config don`t set D: lines
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2. Allow from setted only:
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see the begin format example
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3. Set deny, allow from other:
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D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255
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D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255
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A:* # allow from other, this line not strongly require
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A global and subdirs config merging logic:
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allow rules reducing, deny lines strongled.
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The algorithm combinations:
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4. If current config have
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A:from
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D:*
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subdir config A: lines skiping, D:from - moving top
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5. If current config have
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D:from
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A:*
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result config:
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D:from current
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D:from subdir
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A:from subdir
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and seting D:* if subdir config have this
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If -c don`t setted, used httpd root config, else httpd root config skiped.
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Exited with fault if can`t open start config.
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For set wide open server, use -c /dev/null ;=)
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*/
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#include <stdio.h>
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#include <ctype.h> /* for isspace */
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#include <string.h>
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#include <stdlib.h> /* for malloc */
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#include <time.h>
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#include <unistd.h> /* for close */
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/socket.h> /* for connect and socket*/
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#include <netinet/in.h> /* for sockaddr_in */
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <fcntl.h> /* for open modes */
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#include "busybox.h"
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static const char httpdVersion[] = "busybox httpd/1.20 31-Jan-2003";
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static const char default_patch_httpd_conf[] = "/etc";
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static const char httpd_conf[] = "httpd.conf";
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static const char home[] = "/www";
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// Note: xfuncs are not used because we want the server to keep running
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// if something bad happens due to a malformed user request.
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// As a result, all memory allocation after daemonize
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// is checked rigorously
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//#define DEBUG 1
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/* Configure options, disabled by default as nonstandart httpd feature */
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//#define CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
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//#define CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
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//#define CONFIG_FEATURE_HTTPD_DECODE_URL_STR
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/* disabled as not necessary feature */
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//#define CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
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//#define CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
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//#define CONFIG_FEATURE_HTTPD_SETUID
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//#define CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
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/* If seted this you can use this server from internet superserver only */
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//#define CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
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/* You can use this server as standalone, require libbb.a for linking */
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//#define HTTPD_STANDALONE
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/* Config options, disable this for do very small module */
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//#define CONFIG_FEATURE_HTTPD_CGI
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//#define CONFIG_FEATURE_HTTPD_BASIC_AUTH
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#ifdef HTTPD_STANDALONE
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/* standalone, enable all features */
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#undef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
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/* unset config option for remove warning as redefined */
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#undef CONFIG_FEATURE_HTTPD_BASIC_AUTH
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#undef CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
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#undef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
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#undef CONFIG_FEATURE_HTTPD_DECODE_URL_STR
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#undef CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
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#undef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
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#undef CONFIG_FEATURE_HTTPD_CGI
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#undef CONFIG_FEATURE_HTTPD_SETUID
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#undef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
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/* enable all features now */
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#define CONFIG_FEATURE_HTTPD_BASIC_AUTH
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#define CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
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#define CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
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#define CONFIG_FEATURE_HTTPD_DECODE_URL_STR
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#define CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
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#define CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
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#define CONFIG_FEATURE_HTTPD_CGI
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#define CONFIG_FEATURE_HTTPD_SETUID
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#define CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
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/* require from libbb.a for linking */
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const char *applet_name = "httpd";
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void show_usage(void)
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{
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fprintf(stderr, "Usage: %s [-p <port>] [-c configFile] [-d/-e <string>] "
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"[-r realm] [-u user]\n", applet_name);
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exit(1);
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}
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#endif
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#ifdef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
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#undef CONFIG_FEATURE_HTTPD_SETUID /* use inetd user.group config settings */
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#undef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP /* so is not daemon */
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/* inetd set stderr to accepted socket and we can`t true see debug messages */
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#undef DEBUG
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#endif
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/* CGI environ size */
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#ifdef CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
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#define ENVSIZE 50 /* set max 35 CGI_variable */
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#else
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#define ENVSIZE 15 /* minimal requires */
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#endif
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#define MAX_POST_SIZE (64*1024) /* 64k. Its Small? May be ;) */
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#define MAX_MEMORY_BUFF 8192 /* IO buffer */
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typedef struct HT_ACCESS {
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char *after_colon;
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struct HT_ACCESS *next;
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char before_colon[1]; /* really bigger, must last */
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} Htaccess;
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typedef struct
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{
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#ifdef CONFIG_FEATURE_HTTPD_CGI
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char *envp[ENVSIZE+1];
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int envCount;
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#endif
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char buf[MAX_MEMORY_BUFF];
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#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
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const char *realm;
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#endif
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const char *configFile;
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char rmt_ip[16]; /* for set env REMOTE_ADDR */
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unsigned port; /* server initial port and for
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set env REMOTE_PORT */
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const char *found_mime_type;
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off_t ContentLength; /* -1 - unknown */
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time_t last_mod;
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#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
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int accepted_socket;
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#define a_c_r config->accepted_socket
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#define a_c_w config->accepted_socket
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int debugHttpd; /* if seted, don`t stay daemon */
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#else
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#define a_c_r 0
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#define a_c_w 1
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#endif
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Htaccess *Httpd_conf_parsed;
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} HttpdConfig;
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static HttpdConfig *config;
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static const char request_GET[] = "GET"; /* size algorithic optimize */
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static const char* const suffixTable [] = {
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/* Warning: shorted equalent suffix in one line must be first */
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".htm.html", "text/html",
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".jpg.jpeg", "image/jpeg",
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".gif", "image/gif",
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".png", "image/png",
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".txt.h.c.cc.cpp", "text/plain",
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".css", "text/css",
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".wav", "audio/wav",
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".avi", "video/x-msvideo",
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".qt.mov", "video/quicktime",
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".mpe.mpeg", "video/mpeg",
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".mid.midi", "audio/midi",
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".mp3", "audio/mpeg",
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#if 0 /* unpopular */
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".au", "audio/basic",
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".pac", "application/x-ns-proxy-autoconfig",
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".vrml.wrl", "model/vrml",
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#endif
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0, "application/octet-stream" /* default */
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};
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typedef enum
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{
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HTTP_OK = 200,
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HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
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HTTP_NOT_FOUND = 404,
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HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
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HTTP_BAD_REQUEST = 400, /* malformed syntax */
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HTTP_FORBIDDEN = 403,
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HTTP_INTERNAL_SERVER_ERROR = 500,
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#if 0 /* future use */
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HTTP_CONTINUE = 100,
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HTTP_SWITCHING_PROTOCOLS = 101,
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HTTP_CREATED = 201,
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HTTP_ACCEPTED = 202,
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HTTP_NON_AUTHORITATIVE_INFO = 203,
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HTTP_NO_CONTENT = 204,
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HTTP_MULTIPLE_CHOICES = 300,
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HTTP_MOVED_PERMANENTLY = 301,
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HTTP_MOVED_TEMPORARILY = 302,
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HTTP_NOT_MODIFIED = 304,
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HTTP_PAYMENT_REQUIRED = 402,
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HTTP_BAD_GATEWAY = 502,
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HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
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HTTP_RESPONSE_SETSIZE=0xffffffff
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#endif
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} HttpResponseNum;
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typedef struct
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{
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HttpResponseNum type;
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const char *name;
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const char *info;
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} HttpEnumString;
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static const HttpEnumString httpResponseNames[] = {
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{ HTTP_OK, "OK" },
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{ HTTP_NOT_IMPLEMENTED, "Not Implemented",
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"The requested method is not recognized by this server." },
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{ HTTP_UNAUTHORIZED, "Unauthorized", "" },
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{ HTTP_NOT_FOUND, "Not Found",
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"The requested URL was not found on this server." },
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{ HTTP_BAD_REQUEST, "Bad Request" ,
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"Unsupported method." },
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{ HTTP_FORBIDDEN, "Forbidden", "" },
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{ HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error"
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"Internal Server Error" },
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#if 0
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{ HTTP_CREATED, "Created" },
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{ HTTP_ACCEPTED, "Accepted" },
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{ HTTP_NO_CONTENT, "No Content" },
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{ HTTP_MULTIPLE_CHOICES, "Multiple Choices" },
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{ HTTP_MOVED_PERMANENTLY, "Moved Permanently" },
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{ HTTP_MOVED_TEMPORARILY, "Moved Temporarily" },
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{ HTTP_NOT_MODIFIED, "Not Modified" },
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{ HTTP_BAD_GATEWAY, "Bad Gateway", "" },
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{ HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" },
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#endif
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};
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static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT";
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static const char Content_length[] = "Content-length:";
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/*
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* sotring to:
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* .ext:mime/type
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* /path:user:pass
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* /path/subdir:user:pass
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* D:from
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* A:from
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* D:*
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*/
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static int conf_sort(const void *p1, const void *p2)
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{
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const Htaccess *cl1 = *(const Htaccess **)p1;
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const Htaccess *cl2 = *(const Htaccess **)p2;
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char c1 = cl1->before_colon[0];
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char c2 = cl2->before_colon[0];
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int test;
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#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
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/* .ext line up before other lines for simlify algorithm */
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test = c2 == '.';
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if(c1 == '.')
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return -(!test);
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if(test)
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return test;
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#endif
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#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
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test = c1 == '/';
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/* /path line up before A/D lines for simlify algorithm */
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if(test) {
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if(c2 != '/')
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return -test;
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/* a shortes path with user:pass must be first */
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return strlen(cl1->before_colon) - strlen(cl2->before_colon);
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} else if(c2 == '/')
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return !test;
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#endif
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/* D:from must move top */
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test = c2 == 'D' && cl2->after_colon[0] != 0;
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if(c1 == 'D' && cl1->after_colon[0] != 0) {
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return -(!test);
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}
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if(test)
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return test;
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/* next lines - A:from */
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test = c2 == 'A' && cl2->after_colon[0] != 0;
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if(c1 == 'A' && cl1->after_colon[0] != 0) {
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return -(!test);
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}
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if(test)
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return test;
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/* end lines - D:* */
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test = c2 == 'D' && cl2->after_colon[0] == 0;
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if(c1 == 'D' && cl1->after_colon[0] == 0) {
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return -(!test);
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}
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#ifdef DEBUG
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if(!test)
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error_msg_and_die("sort: can`t found compares!");
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#endif
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return test;
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}
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/* flag */
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#define FIRST_PARSE 0
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#define SUBDIR_PARSE 1
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#define SIGNALED_PARSE 2
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static void parse_conf(const char *path, int flag)
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{
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#define bc cur->before_colon[0]
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#define ac cur->after_colon[0]
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FILE *f;
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Htaccess *prev;
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Htaccess *cur;
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const char *cf = config->configFile;
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char buf[80];
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char *p0 = NULL;
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int deny_all = 0; /* default A:* */
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int n = 0; /* count config lines */
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if(flag == SUBDIR_PARSE || cf == NULL) {
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cf = p0 = alloca(strlen(path) + sizeof(httpd_conf) + 2);
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if(p0 == NULL) {
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if(flag == FIRST_PARSE)
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error_msg_and_die(memory_exhausted);
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return;
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}
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sprintf(p0, "%s/%s", path, httpd_conf);
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}
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while((f = fopen(cf, "r")) == NULL) {
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if(flag != FIRST_PARSE)
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return; /* subdir config not found */
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if(p0 == NULL) /* if -c option gived */
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perror_msg_and_die("%s", cf);
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p0 = NULL;
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cf = httpd_conf; /* set -c ./httpd_conf */
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}
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prev = config->Httpd_conf_parsed;
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if(flag != SUBDIR_PARSE) {
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/* free previous setuped */
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while( prev ) {
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cur = prev;
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prev = cur->next;
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free(cur);
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}
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config->Httpd_conf_parsed = prev; /* eq NULL */
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} else {
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/* parse previous IP logic for merge */
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for(cur = prev; cur; cur = cur->next) {
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if(bc == 'D' && ac == 0)
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deny_all++;
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n++;
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/* find last for set prev->next of merging */
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if(cur != prev)
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prev = prev->next;
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}
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}
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/* This could stand some work */
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while ( (p0 = fgets(buf, 80, f)) != NULL) {
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char *p;
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char *colon;
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for(p = colon = p0; *p; p++) {
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if(*p == '#') {
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*p = 0;
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break;
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}
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if(isspace(*p)) {
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if(p != p0) {
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*p = 0;
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break;
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}
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p0++;
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}
|
|
else if(*p == ':' && colon <= p0)
|
|
colon = p;
|
|
}
|
|
|
|
/* test for empty or strange line */
|
|
if (colon <= p0 || colon[1] == 0)
|
|
continue;
|
|
if(colon[1] == '*')
|
|
colon[1] = 0; /* Allow all */
|
|
if(*p0 == 'a')
|
|
*p0 = 'A';
|
|
if(*p0 == 'd')
|
|
*p0 = 'D';
|
|
if(*p0 != 'A' && *p0 != 'D'
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
&& *p0 != '/'
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
|
|
&& *p0 != '.'
|
|
#endif
|
|
)
|
|
continue;
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
if(*p0 == '/' && colon[1] == 0) {
|
|
/* skip /path:* */
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
if(*p0 == 'A' || *p0 == 'D') {
|
|
if(colon[1] == 0) {
|
|
if(*p0 == 'A' || deny_all != 0)
|
|
continue; /* skip default A:* or double D:* */
|
|
}
|
|
if(deny_all != 0 && *p0 == 'A')
|
|
continue; // if previous setted rule D:* skip all subdir A:
|
|
}
|
|
|
|
/* storing current config line */
|
|
cur = calloc(1, sizeof(Htaccess) + (p-p0));
|
|
if(cur) {
|
|
if(*(colon-1) == '/' && (colon-1) != p0)
|
|
colon[-1] = 0; // remove last / from /path/
|
|
cur->after_colon = strcpy(cur->before_colon, p0);
|
|
cur->after_colon += (colon-p0);
|
|
*cur->after_colon++ = 0;
|
|
|
|
if(prev == NULL) {
|
|
/* first line */
|
|
config->Httpd_conf_parsed = prev = cur;
|
|
} else {
|
|
prev->next = cur;
|
|
prev = cur;
|
|
}
|
|
n++;
|
|
}
|
|
}
|
|
fclose(f);
|
|
|
|
if(n > 1) {
|
|
/* sorting conf lines */
|
|
Htaccess ** pcur; /* array for qsort */
|
|
|
|
prev = config->Httpd_conf_parsed;
|
|
pcur = alloca((n + 1) * sizeof(Htaccess *));
|
|
if(pcur == NULL) {
|
|
if(flag == FIRST_PARSE)
|
|
error_msg_and_die(memory_exhausted);
|
|
return;
|
|
}
|
|
n = 0;
|
|
for(cur = prev; cur; cur = cur->next)
|
|
pcur[n++] = cur;
|
|
pcur[n] = NULL;
|
|
|
|
qsort(pcur, n, sizeof(Htaccess *), conf_sort);
|
|
|
|
/* storing sorted config */
|
|
config->Httpd_conf_parsed = *pcur;
|
|
for(cur = *pcur; cur; cur = cur->next) {
|
|
#ifdef DEBUG
|
|
error_msg("%s: %s:%s", cf, cur->before_colon, cur->after_colon);
|
|
#endif
|
|
cur->next = *++pcur;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
|
|
/****************************************************************************
|
|
*
|
|
> $Function: encodeString()
|
|
*
|
|
* $Description: Given a string, html encode special characters.
|
|
* This is used for the -e command line option to provide an easy way
|
|
* for scripts to encode result data without confusing browsers. The
|
|
* returned string pointer is memory allocated by malloc().
|
|
*
|
|
* $Parameters:
|
|
* (const char *) string . . The first string to encode.
|
|
*
|
|
* $Return: (char *) . . . .. . . A pointer to the encoded string.
|
|
*
|
|
* $Errors: Returns a null string ("") if memory is not available.
|
|
*
|
|
****************************************************************************/
|
|
static char *encodeString(const char *string)
|
|
{
|
|
/* take the simple route and encode everything */
|
|
/* could possibly scan once to get length. */
|
|
int len = strlen(string);
|
|
char *out = malloc(len*5 +1);
|
|
char *p=out;
|
|
char ch;
|
|
|
|
if (!out) return "";
|
|
while ((ch = *string++)) {
|
|
// very simple check for what to encode
|
|
if (isalnum(ch)) *p++ = ch;
|
|
else p += sprintf(p, "&#%d", (unsigned char) ch);
|
|
}
|
|
*p=0;
|
|
return out;
|
|
}
|
|
#endif /* CONFIG_FEATURE_HTTPD_ENCODE_URL_STR */
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_DECODE_URL_STR
|
|
/****************************************************************************
|
|
*
|
|
> $Function: decodeString()
|
|
*
|
|
* $Description: Given a URL encoded string, convert it to plain ascii.
|
|
* Since decoding always makes strings smaller, the decode is done in-place.
|
|
* Thus, callers should strdup() the argument if they do not want the
|
|
* argument modified. The return is the original pointer, allowing this
|
|
* function to be easily used as arguments to other functions.
|
|
*
|
|
* $Parameters:
|
|
* (char *) string . . . The first string to decode.
|
|
*
|
|
* $Return: (char *) . . . . A pointer to the decoded string (same as input).
|
|
*
|
|
* $Errors: None
|
|
*
|
|
****************************************************************************/
|
|
static char *decodeString(char *string)
|
|
{
|
|
/* note that decoded string is always shorter than original */
|
|
char *orig = string;
|
|
char *ptr = string;
|
|
while (*ptr)
|
|
{
|
|
if (*ptr == '+') { *string++ = ' '; ptr++; }
|
|
else if (*ptr != '%') *string++ = *ptr++;
|
|
else {
|
|
unsigned int value;
|
|
sscanf(ptr+1, "%2X", &value);
|
|
*string++ = value;
|
|
ptr += 3;
|
|
}
|
|
}
|
|
*string = '\0';
|
|
return orig;
|
|
}
|
|
#endif /* CONFIG_FEATURE_HTTPD_DECODE_URL_STR */
|
|
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_CGI
|
|
/****************************************************************************
|
|
*
|
|
> $Function: addEnv()
|
|
*
|
|
* $Description: Add an enviornment variable setting to the global list.
|
|
* A NAME=VALUE string is allocated, filled, and added to the list of
|
|
* environment settings passed to the cgi execution script.
|
|
*
|
|
* $Parameters:
|
|
* (char *) name_before_underline - The first part environment variable name.
|
|
* (char *) name_after_underline - The second part environment variable name.
|
|
* (char *) value . . The value to which the env variable is set.
|
|
*
|
|
* $Return: (void)
|
|
*
|
|
* $Errors: Silently returns if the env runs out of space to hold the new item
|
|
*
|
|
****************************************************************************/
|
|
static void addEnv(const char *name_before_underline,
|
|
const char *name_after_underline, const char *value)
|
|
{
|
|
char *s;
|
|
|
|
if (config->envCount >= ENVSIZE)
|
|
return;
|
|
if (!value)
|
|
value = "";
|
|
s = malloc(strlen(name_before_underline) + strlen(name_after_underline) +
|
|
strlen(value) + 3);
|
|
if (s) {
|
|
const char *underline = *name_after_underline ? "_" : "";
|
|
|
|
sprintf(s,"%s%s%s=%s", name_before_underline, underline,
|
|
name_after_underline, value);
|
|
config->envp[config->envCount++] = s;
|
|
config->envp[config->envCount] = 0;
|
|
}
|
|
}
|
|
|
|
/* set environs SERVER_PORT and REMOTE_PORT */
|
|
static void addEnvPort(const char *port_name)
|
|
{
|
|
char buf[16];
|
|
|
|
sprintf(buf, "%u", config->port);
|
|
addEnv(port_name, "PORT", buf);
|
|
}
|
|
#endif /* CONFIG_FEATURE_HTTPD_CGI */
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
|
|
/****************************************************************************
|
|
*
|
|
> $Function: addEnvCgi
|
|
*
|
|
* $Description: Create environment variables given a URL encoded arg list.
|
|
* For each variable setting the URL encoded arg list, create a corresponding
|
|
* environment variable. URL encoded arguments have the form
|
|
* name1=value1&name2=value2&name3=&ignores
|
|
* from this example, name3 set empty value, tail without '=' skiping
|
|
*
|
|
* $Parameters:
|
|
* (char *) pargs . . . . A pointer to the URL encoded arguments.
|
|
*
|
|
* $Return: None
|
|
*
|
|
* $Errors: None
|
|
*
|
|
****************************************************************************/
|
|
static void addEnvCgi(const char *pargs)
|
|
{
|
|
char *args;
|
|
char *memargs;
|
|
if (pargs==0) return;
|
|
|
|
/* args are a list of name=value&name2=value2 sequences */
|
|
memargs = args = strdup(pargs);
|
|
while (args && *args) {
|
|
const char *name = args;
|
|
char *value = strchr(args, '=');
|
|
|
|
if (!value) /* &XXX without '=' */
|
|
break;
|
|
*value++ = 0;
|
|
args = strchr(value, '&');
|
|
if (args)
|
|
*args++ = 0;
|
|
addEnv("CGI", name, decodeString(value));
|
|
}
|
|
free(memargs);
|
|
}
|
|
#endif /* CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV */
|
|
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
/****************************************************************************
|
|
*
|
|
> $Function: decodeBase64()
|
|
*
|
|
> $Description: Decode a base 64 data stream as per rfc1521.
|
|
* Note that the rfc states that none base64 chars are to be ignored.
|
|
* Since the decode always results in a shorter size than the input, it is
|
|
* OK to pass the input arg as an output arg.
|
|
*
|
|
* $Parameter:
|
|
* (char *) Data . . . . A pointer to a base64 encoded string.
|
|
* Where to place the decoded data.
|
|
*
|
|
* $Return: void
|
|
*
|
|
* $Errors: None
|
|
*
|
|
****************************************************************************/
|
|
static void decodeBase64(char *Data)
|
|
{
|
|
int i = 0;
|
|
static const char base64ToBin[] =
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
|
|
|
const unsigned char *in = Data;
|
|
// The decoded size will be at most 3/4 the size of the encoded
|
|
unsigned long ch = 0;
|
|
|
|
while (*in) {
|
|
unsigned char conv = 0;
|
|
|
|
while (*in) {
|
|
const char *p64;
|
|
|
|
p64 = strchr(base64ToBin, *in++);
|
|
if(p64 == NULL)
|
|
continue;
|
|
conv = (p64 - base64ToBin);
|
|
break;
|
|
}
|
|
ch = (ch << 6) | conv;
|
|
i++;
|
|
if (i== 4) {
|
|
*Data++ = (char) (ch >> 16);
|
|
*Data++ = (char) (ch >> 8);
|
|
*Data++ = (char) ch;
|
|
i = 0;
|
|
}
|
|
}
|
|
*Data = 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
/****************************************************************************
|
|
*
|
|
> $Function: openServer()
|
|
*
|
|
* $Description: create a listen server socket on the designated port.
|
|
*
|
|
* $Return: (int) . . . A connection socket. -1 for errors.
|
|
*
|
|
* $Errors: None
|
|
*
|
|
****************************************************************************/
|
|
static int openServer(void)
|
|
{
|
|
struct sockaddr_in lsocket;
|
|
int fd;
|
|
|
|
/* create the socket right now */
|
|
/* inet_addr() returns a value that is already in network order */
|
|
memset(&lsocket, 0, sizeof(lsocket));
|
|
lsocket.sin_family = AF_INET;
|
|
lsocket.sin_addr.s_addr = INADDR_ANY;
|
|
lsocket.sin_port = htons(config->port) ;
|
|
fd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (fd >= 0) {
|
|
/* tell the OS it's OK to reuse a previous address even though */
|
|
/* it may still be in a close down state. Allows bind to succeed. */
|
|
int on = 1;
|
|
#ifdef SO_REUSEPORT
|
|
setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (void *)&on, sizeof(on)) ;
|
|
#else
|
|
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)) ;
|
|
#endif
|
|
if (bind(fd, (struct sockaddr *)&lsocket, sizeof(lsocket)) == 0) {
|
|
listen(fd, 9);
|
|
signal(SIGCHLD, SIG_IGN); /* prevent zombie (defunct) processes */
|
|
} else {
|
|
perror_msg_and_die("bind");
|
|
}
|
|
} else {
|
|
perror_msg_and_die("create socket");
|
|
}
|
|
return fd;
|
|
}
|
|
#endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */
|
|
|
|
/****************************************************************************
|
|
*
|
|
> $Function: sendHeaders()
|
|
*
|
|
* $Description: Create and send HTTP response headers.
|
|
* The arguments are combined and sent as one write operation. Note that
|
|
* IE will puke big-time if the headers are not sent in one packet and the
|
|
* second packet is delayed for any reason.
|
|
*
|
|
* $Parameter:
|
|
* (HttpResponseNum) responseNum . . . The result code to send.
|
|
*
|
|
* $Return: (int) . . . . writing errors
|
|
*
|
|
****************************************************************************/
|
|
static int sendHeaders(HttpResponseNum responseNum)
|
|
{
|
|
char *buf = config->buf;
|
|
const char *responseString = "";
|
|
const char *infoString = 0;
|
|
unsigned int i;
|
|
time_t timer = time(0);
|
|
char timeStr[80];
|
|
int len;
|
|
|
|
for (i = 0;
|
|
i < (sizeof(httpResponseNames)/sizeof(httpResponseNames[0])); i++) {
|
|
if (httpResponseNames[i].type == responseNum) {
|
|
responseString = httpResponseNames[i].name;
|
|
infoString = httpResponseNames[i].info;
|
|
break;
|
|
}
|
|
}
|
|
if (responseNum != HTTP_OK) {
|
|
config->found_mime_type = "text/html"; // error message is HTML
|
|
}
|
|
|
|
/* emit the current date */
|
|
strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer));
|
|
len = sprintf(buf,
|
|
"HTTP/1.0 %d %s\nContent-type: %s\r\n"
|
|
"Date: %s\r\nConnection: close\r\n",
|
|
responseNum, responseString, config->found_mime_type, timeStr);
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
if (responseNum == HTTP_UNAUTHORIZED) {
|
|
len += sprintf(buf+len, "WWW-Authenticate: Basic realm=\"%s\"\r\n",
|
|
config->realm);
|
|
}
|
|
#endif
|
|
if (config->ContentLength != -1) { /* file */
|
|
strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod));
|
|
len += sprintf(buf+len, "Last-Modified: %s\r\n%s %ld\r\n",
|
|
timeStr, Content_length, config->ContentLength);
|
|
}
|
|
strcat(buf, "\r\n");
|
|
len += 2;
|
|
if (infoString) {
|
|
len += sprintf(buf+len,
|
|
"<HEAD><TITLE>%d %s</TITLE></HEAD>\n"
|
|
"<BODY><H1>%d %s</H1>\n%s\n</BODY>\n",
|
|
responseNum, responseString,
|
|
responseNum, responseString, infoString);
|
|
}
|
|
#ifdef DEBUG
|
|
if (config->debugHttpd) fprintf(stderr, "Headers: '%s'", buf);
|
|
#endif
|
|
return full_write(a_c_w, buf, len);
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
> $Function: getLine()
|
|
*
|
|
* $Description: Read from the socket until an end of line char found.
|
|
*
|
|
* Characters are read one at a time until an eol sequence is found.
|
|
*
|
|
* $Parameters:
|
|
* (char *) buf . . Where to place the read result.
|
|
*
|
|
* $Return: (int) . . . . number of characters read. -1 if error.
|
|
*
|
|
****************************************************************************/
|
|
static int getLine(char *buf)
|
|
{
|
|
int count = 0;
|
|
|
|
while (read(a_c_r, buf + count, 1) == 1) {
|
|
if (buf[count] == '\r') continue;
|
|
if (buf[count] == '\n') {
|
|
buf[count] = 0;
|
|
return count;
|
|
}
|
|
if(count < (MAX_MEMORY_BUFF-1)) /* check owerflow */
|
|
count++;
|
|
}
|
|
if (count) return count;
|
|
else return -1;
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_CGI
|
|
/****************************************************************************
|
|
*
|
|
> $Function: sendCgi()
|
|
*
|
|
* $Description: Execute a CGI script and send it's stdout back
|
|
*
|
|
* Environment variables are set up and the script is invoked with pipes
|
|
* for stdin/stdout. If a post is being done the script is fed the POST
|
|
* data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
|
|
*
|
|
* $Parameters:
|
|
* (const char *) url . . . The requested URL (with leading /).
|
|
* (const char *urlArgs). . Any URL arguments.
|
|
* (const char *body) . . . POST body contents.
|
|
* (int bodyLen) . . . . . Length of the post body.
|
|
* (const char *cookie) . . For set HTTP_COOKIE.
|
|
|
|
*
|
|
* $Return: (char *) . . . . A pointer to the decoded string (same as input).
|
|
*
|
|
* $Errors: None
|
|
*
|
|
****************************************************************************/
|
|
static int sendCgi(const char *url,
|
|
const char *request, const char *urlArgs,
|
|
const char *body, int bodyLen, const char *cookie)
|
|
{
|
|
int fromCgi[2]; /* pipe for reading data from CGI */
|
|
int toCgi[2]; /* pipe for sending data to CGI */
|
|
|
|
static char * argp[] = { 0, 0 };
|
|
int pid = 0;
|
|
int inFd;
|
|
int outFd;
|
|
int firstLine = 1;
|
|
|
|
do {
|
|
if (pipe(fromCgi) != 0) {
|
|
break;
|
|
}
|
|
if (pipe(toCgi) != 0) {
|
|
break;
|
|
}
|
|
|
|
pid = fork();
|
|
if (pid < 0) {
|
|
pid = 0;
|
|
break;
|
|
}
|
|
|
|
if (!pid) {
|
|
/* child process */
|
|
char *script;
|
|
char *purl = strdup( url );
|
|
char realpath_buff[MAXPATHLEN];
|
|
|
|
if(purl == NULL)
|
|
_exit(242);
|
|
|
|
inFd = toCgi[0];
|
|
outFd = fromCgi[1];
|
|
|
|
dup2(inFd, 0); // replace stdin with the pipe
|
|
dup2(outFd, 1); // replace stdout with the pipe
|
|
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
if (!config->debugHttpd)
|
|
#endif
|
|
dup2(outFd, 2); // replace stderr with the pipe
|
|
|
|
close(toCgi[0]);
|
|
close(toCgi[1]);
|
|
close(fromCgi[0]);
|
|
close(fromCgi[1]);
|
|
|
|
/*
|
|
* Find PATH_INFO.
|
|
*/
|
|
script = purl;
|
|
while((script = strchr( script + 1, '/' )) != NULL) {
|
|
/* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
|
|
struct stat sb;
|
|
|
|
*script = '\0';
|
|
if(is_directory(purl + 1, 1, &sb) == 0) {
|
|
/* not directory, found script.cgi/PATH_INFO */
|
|
*script = '/';
|
|
break;
|
|
}
|
|
*script = '/'; /* is directory, find next '/' */
|
|
}
|
|
addEnv("PATH", "INFO", script); /* set /PATH_INFO or NULL */
|
|
addEnv("PATH", "", getenv("PATH"));
|
|
addEnv("REQUEST", "METHOD", request);
|
|
if(urlArgs) {
|
|
char *uri = alloca(strlen(purl) + 2 + strlen(urlArgs));
|
|
if(uri)
|
|
sprintf(uri, "%s?%s", purl, urlArgs);
|
|
addEnv("REQUEST", "URI", uri);
|
|
} else {
|
|
addEnv("REQUEST", "URI", purl);
|
|
}
|
|
if(script != NULL)
|
|
*script = '\0'; /* reduce /PATH_INFO */
|
|
/* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
|
|
addEnv("SCRIPT_NAME", "", purl);
|
|
addEnv("QUERY_STRING", "", urlArgs);
|
|
addEnv("SERVER", "SOFTWARE", httpdVersion);
|
|
addEnv("SERVER", "PROTOCOL", "HTTP/1.0");
|
|
addEnv("GATEWAY_INTERFACE", "", "CGI/1.1");
|
|
#ifdef CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
|
|
addEnv("REMOTE", "ADDR", config->rmt_ip);
|
|
addEnvPort("REMOTE");
|
|
#else
|
|
addEnv("REMOTE_ADDR", "", config->rmt_ip);
|
|
#endif
|
|
if(bodyLen) {
|
|
char sbl[32];
|
|
|
|
sprintf(sbl, "%d", bodyLen);
|
|
addEnv("CONTENT_LENGTH", "", sbl);
|
|
}
|
|
if(cookie)
|
|
addEnv("HTTP_COOKIE", "", cookie);
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
|
|
if (request != request_GET) {
|
|
addEnvCgi(body);
|
|
} else {
|
|
addEnvCgi(urlArgs);
|
|
}
|
|
#endif
|
|
|
|
/* set execve argp[0] without path */
|
|
argp[0] = strrchr( purl, '/' ) + 1;
|
|
/* but script argp[0] must have absolute path and chdiring to this */
|
|
if(realpath(purl + 1, realpath_buff) != NULL) {
|
|
script = strrchr(realpath_buff, '/');
|
|
if(script) {
|
|
*script = '\0';
|
|
if(chdir(realpath_buff) == 0) {
|
|
*script = '/';
|
|
// now run the program. If it fails, use _exit() so no destructors
|
|
// get called and make a mess.
|
|
execve(realpath_buff, argp, config->envp);
|
|
}
|
|
}
|
|
}
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
config->accepted_socket = 1; /* send to stdout */
|
|
#endif
|
|
sendHeaders(HTTP_NOT_FOUND);
|
|
_exit(242);
|
|
} /* end child */
|
|
|
|
} while (0);
|
|
|
|
if (pid) {
|
|
/* parent process */
|
|
int status;
|
|
|
|
inFd = fromCgi[0];
|
|
outFd = toCgi[1];
|
|
close(fromCgi[1]);
|
|
close(toCgi[0]);
|
|
if (body) full_write(outFd, body, bodyLen);
|
|
close(outFd);
|
|
|
|
while (1) {
|
|
struct timeval timeout;
|
|
fd_set readSet;
|
|
char buf[160];
|
|
int nfound;
|
|
int count;
|
|
|
|
FD_ZERO(&readSet);
|
|
FD_SET(inFd, &readSet);
|
|
|
|
/* Now wait on the set of sockets! */
|
|
timeout.tv_sec = 0;
|
|
timeout.tv_usec = 10000;
|
|
nfound = select(inFd + 1, &readSet, 0, 0, &timeout);
|
|
|
|
if (nfound <= 0) {
|
|
if (waitpid(pid, &status, WNOHANG) > 0) {
|
|
close(inFd);
|
|
#ifdef DEBUG
|
|
if (config->debugHttpd) {
|
|
if (WIFEXITED(status))
|
|
error_msg("piped has exited with status=%d", WEXITSTATUS(status));
|
|
if (WIFSIGNALED(status))
|
|
error_msg("piped has exited with signal=%d", WTERMSIG(status));
|
|
}
|
|
#endif
|
|
pid = -1;
|
|
break;
|
|
}
|
|
} else {
|
|
int s = a_c_w;
|
|
|
|
// There is something to read
|
|
count = full_read(inFd, buf, sizeof(buf)-1);
|
|
// If a read returns 0 at this point then some type of error has
|
|
// occurred. Bail now.
|
|
if (count == 0) break;
|
|
if (count > 0) {
|
|
if (firstLine) {
|
|
/* check to see if the user script added headers */
|
|
if (strncmp(buf, "HTTP/1.0 200 OK\n", 4) != 0) {
|
|
full_write(s, "HTTP/1.0 200 OK\n", 16);
|
|
}
|
|
if (strstr(buf, "ontent-") == 0) {
|
|
full_write(s, "Content-type: text/plain\n\n", 26);
|
|
}
|
|
firstLine=0;
|
|
}
|
|
full_write(s, buf, count);
|
|
#ifdef DEBUG
|
|
if (config->debugHttpd)
|
|
fprintf(stderr, "cgi read %d bytes\n", count);
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_FEATURE_HTTPD_CGI */
|
|
|
|
/****************************************************************************
|
|
*
|
|
> $Function: sendFile()
|
|
*
|
|
* $Description: Send a file response to an HTTP request
|
|
*
|
|
* $Parameter:
|
|
* (const char *) url . . The URL requested.
|
|
* (char *) buf . . . . . The stack buffer.
|
|
*
|
|
* $Return: (int) . . . . . . Always 0.
|
|
*
|
|
****************************************************************************/
|
|
static int sendFile(const char *url, char *buf)
|
|
{
|
|
char * suffix;
|
|
int f;
|
|
const char * const * table;
|
|
const char * try_suffix;
|
|
|
|
suffix = strrchr(url, '.');
|
|
|
|
for (table = suffixTable; *table; table += 2)
|
|
if(suffix != NULL && (try_suffix = strstr(*table, suffix)) != 0) {
|
|
try_suffix += strlen(suffix);
|
|
if(*try_suffix == 0 || *try_suffix == '.')
|
|
break;
|
|
}
|
|
/* also, if not found, set default as "application/octet-stream"; */
|
|
config->found_mime_type = *(table+1);
|
|
#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
|
|
if (suffix) {
|
|
Htaccess * cur;
|
|
|
|
for (cur = config->Httpd_conf_parsed; cur; cur = cur->next) {
|
|
if(strcmp(cur->before_colon, suffix) == 0) {
|
|
config->found_mime_type = cur->after_colon;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif /* CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
|
|
|
|
#ifdef DEBUG
|
|
if (config->debugHttpd)
|
|
fprintf(stderr, "Sending file '%s' Content-type: %s\n",
|
|
url, config->found_mime_type);
|
|
#endif
|
|
|
|
f = open(url, O_RDONLY);
|
|
if (f >= 0) {
|
|
int count;
|
|
|
|
sendHeaders(HTTP_OK);
|
|
while ((count = full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
|
|
full_write(a_c_w, buf, count);
|
|
}
|
|
close(f);
|
|
} else {
|
|
#ifdef DEBUG
|
|
if (config->debugHttpd)
|
|
perror_msg("Unable to open '%s'", url);
|
|
#endif
|
|
sendHeaders(HTTP_NOT_FOUND);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
> $Function: checkPerm()
|
|
*
|
|
* $Description: Check the permission file for access.
|
|
*
|
|
* If config file isn't present, everything is allowed.
|
|
* Entries are of the form you can see example from header source
|
|
*
|
|
* $Parameters:
|
|
* (const char *) path . . . . The file path or NULL for ip addresses.
|
|
* (const char *) request . . . User information to validate.
|
|
*
|
|
* $Return: (int) . . . . . . . . . 1 if request OK, 0 otherwise.
|
|
*
|
|
****************************************************************************/
|
|
|
|
|
|
static int checkPerm(const char *path, const char *request)
|
|
{
|
|
Htaccess * cur;
|
|
const char *p;
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
int ipaddr = path == NULL;
|
|
const char *prev = NULL;
|
|
#else
|
|
# define ipaddr 1
|
|
#endif
|
|
|
|
/* This could stand some work */
|
|
for (cur = config->Httpd_conf_parsed; cur; cur = cur->next) {
|
|
const char *p0 = cur->before_colon;
|
|
|
|
if(*p0 == 'A' || *p0 == 'D') {
|
|
if(!ipaddr)
|
|
continue;
|
|
} else {
|
|
if(ipaddr)
|
|
continue;
|
|
#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
|
|
if(*p0 == '.')
|
|
continue;
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
if(prev != NULL && strcmp(prev, p0) != 0)
|
|
continue; /* find next identical */
|
|
#endif
|
|
}
|
|
|
|
p = cur->after_colon;
|
|
#ifdef DEBUG
|
|
if (config->debugHttpd)
|
|
fprintf(stderr,"checkPerm: '%s' ? '%s'\n",
|
|
(ipaddr ? p : p0), request);
|
|
#endif
|
|
if(ipaddr) {
|
|
if(strncmp(p, request, strlen(p)) != 0)
|
|
continue;
|
|
return *p0 == 'A'; /* Allow/Deny */
|
|
|
|
}
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
else {
|
|
int l = strlen(p0);
|
|
|
|
if(strncmp(p0, path, l) == 0 &&
|
|
(l == 1 || path[l] == '/' || path[l] == 0)) {
|
|
/* path match found. Check request */
|
|
if (strcmp(p, request) == 0)
|
|
return 1; /* Ok */
|
|
/* unauthorized, but check next /path:user:password */
|
|
prev = p0;
|
|
}
|
|
}
|
|
#endif
|
|
} /* for */
|
|
|
|
#ifndef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
/* if uncofigured, return 1 - access from all */
|
|
return 1;
|
|
#else
|
|
return prev == NULL;
|
|
#endif
|
|
}
|
|
|
|
|
|
/****************************************************************************
|
|
*
|
|
> $Function: handleIncoming()
|
|
*
|
|
* $Description: Handle an incoming http request.
|
|
*
|
|
****************************************************************************/
|
|
static void handleIncoming(void)
|
|
{
|
|
char *buf = config->buf;
|
|
char *url;
|
|
char *purl;
|
|
int blank = -1;
|
|
char *urlArgs;
|
|
#ifdef CONFIG_FEATURE_HTTPD_CGI
|
|
const char *prequest = request_GET;
|
|
char *body = 0;
|
|
long length=0;
|
|
char *cookie = 0;
|
|
#endif
|
|
char *test;
|
|
struct stat sb;
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
int credentials = -1; /* if not requred this is Ok */
|
|
#endif
|
|
|
|
do {
|
|
int count;
|
|
|
|
if (getLine(buf) <= 0)
|
|
break; /* closed */
|
|
|
|
purl = strpbrk(buf, " \t");
|
|
if(purl == NULL) {
|
|
BAD_REQUEST:
|
|
sendHeaders(HTTP_BAD_REQUEST);
|
|
break;
|
|
}
|
|
*purl = 0;
|
|
#ifdef CONFIG_FEATURE_HTTPD_CGI
|
|
if(strcasecmp(buf, prequest) != 0) {
|
|
prequest = "POST";
|
|
if(strcasecmp(buf, prequest) != 0) {
|
|
sendHeaders(HTTP_NOT_IMPLEMENTED);
|
|
break;
|
|
}
|
|
}
|
|
#else
|
|
if(strcasecmp(buf, request_GET) != 0) {
|
|
sendHeaders(HTTP_NOT_IMPLEMENTED);
|
|
break;
|
|
}
|
|
#endif
|
|
*purl = ' ';
|
|
count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank);
|
|
|
|
if (count < 1 || buf[0] != '/') {
|
|
/* Garbled request/URL */
|
|
goto BAD_REQUEST;
|
|
}
|
|
url = alloca(strlen(buf) + 12); /* + sizeof("/index.html\0") */
|
|
if(url == NULL) {
|
|
sendHeaders(HTTP_INTERNAL_SERVER_ERROR);
|
|
break;
|
|
}
|
|
strcpy(url, buf);
|
|
/* extract url args if present */
|
|
urlArgs = strchr(url, '?');
|
|
if (urlArgs) {
|
|
*urlArgs++ = 0; /* next code can set '/' to this pointer,
|
|
but CGI script can`t be a directory */
|
|
}
|
|
|
|
/* algorithm stolen from libbb simplify_path(),
|
|
but don`t strdup and reducing trailing slash */
|
|
purl = test = url;
|
|
|
|
do {
|
|
if (*purl == '/') {
|
|
if (*test == '/') { /* skip duplicate (or initial) slash */
|
|
continue;
|
|
} else if (*test == '.') {
|
|
if (test[1] == '/' || test[1] == 0) { /* skip extra '.' */
|
|
continue;
|
|
} else if ((test[1] == '.') && (test[2] == '/' || test[2] == 0)) {
|
|
++test;
|
|
if (purl == url) {
|
|
/* protect out root */
|
|
goto BAD_REQUEST;
|
|
}
|
|
while (*--purl != '/'); /* omit previous dir */
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
*++purl = *test;
|
|
} while (*++test);
|
|
|
|
*++purl = 0; /* so keep last character */
|
|
test = purl; /* end ptr */
|
|
|
|
/* If URL is directory, adding '/' */
|
|
if(test[-1] != '/') {
|
|
if ( is_directory(url + 1, 1, &sb) ) {
|
|
*test++ = '/';
|
|
*test = 0;
|
|
purl = test; /* end ptr */
|
|
}
|
|
}
|
|
#ifdef DEBUG
|
|
if (config->debugHttpd)
|
|
fprintf(stderr, "url='%s', args=%s\n", url, urlArgs);
|
|
#endif
|
|
|
|
test = url;
|
|
while((test = strchr( test + 1, '/' )) != NULL) {
|
|
/* have path1/path2 */
|
|
*test = '\0';
|
|
if( is_directory(url + 1, 1, &sb) ) {
|
|
/* may be having subdir config */
|
|
parse_conf(url + 1, SUBDIR_PARSE);
|
|
}
|
|
*test = '/';
|
|
}
|
|
|
|
// read until blank line for HTTP version specified, else parse immediate
|
|
while (blank >= 0 && (count = getLine(buf)) > 0) {
|
|
|
|
#ifdef DEBUG
|
|
if (config->debugHttpd) fprintf(stderr, "Header: '%s'\n", buf);
|
|
#endif
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_CGI
|
|
/* try and do our best to parse more lines */
|
|
if ((strncasecmp(buf, Content_length, 15) == 0)) {
|
|
if(prequest != request_GET)
|
|
length = strtol(buf + 15, 0, 0); // extra read only for POST
|
|
} else if ((strncasecmp(buf, "Cookie:", 7) == 0)) {
|
|
for(test = buf + 7; isspace(*test); test++)
|
|
;
|
|
cookie = strdup(test);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
if (strncasecmp(buf, "Authorization:", 14) == 0) {
|
|
/* We only allow Basic credentials.
|
|
* It shows up as "Authorization: Basic <userid:password>" where
|
|
* the userid:password is base64 encoded.
|
|
*/
|
|
for(test = buf + 14; isspace(*test); test++)
|
|
;
|
|
if (strncasecmp(test, "Basic", 5) != 0)
|
|
continue;
|
|
|
|
test += 5; /* decodeBase64() skiping space self */
|
|
decodeBase64(test);
|
|
credentials = checkPerm(url, test);
|
|
}
|
|
#endif /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */
|
|
|
|
} /* while extra header reading */
|
|
|
|
|
|
if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 ||
|
|
checkPerm(NULL, config->rmt_ip) == 0) {
|
|
/* protect listing [/path]/httpd_conf or IP deny */
|
|
#ifdef CONFIG_FEATURE_HTTPD_CGI
|
|
FORBIDDEN: /* protect listing /cgi-bin */
|
|
#endif
|
|
sendHeaders(HTTP_FORBIDDEN);
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
if (credentials <= 0 && checkPerm(url, ":") == 0) {
|
|
sendHeaders(HTTP_UNAUTHORIZED);
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
test = url + 1; /* skip first '/' */
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_CGI
|
|
/* if strange Content-Length */
|
|
if (length < 0 || length > MAX_POST_SIZE)
|
|
break;
|
|
|
|
if (length > 0) {
|
|
body = malloc(length + 1);
|
|
if (body) {
|
|
length = full_read(a_c_r, body, length);
|
|
if(length < 0) // closed
|
|
length = 0;
|
|
body[length] = 0; // always null terminate for safety
|
|
}
|
|
}
|
|
|
|
if (strncmp(test, "cgi-bin", 7) == 0) {
|
|
if(test[7] == 0 || (test[7] == '/' && test[8] == 0))
|
|
goto FORBIDDEN; // protect listing cgi-bin
|
|
sendCgi(url, prequest, urlArgs, body, length, cookie);
|
|
} else {
|
|
if (prequest != request_GET)
|
|
sendHeaders(HTTP_NOT_IMPLEMENTED);
|
|
else {
|
|
#endif /* CONFIG_FEATURE_HTTPD_CGI */
|
|
if(purl[-1] == '/')
|
|
strcpy(purl, "index.html");
|
|
if ( stat(test, &sb ) == 0 ) {
|
|
config->ContentLength = sb.st_size;
|
|
config->last_mod = sb.st_mtime;
|
|
}
|
|
sendFile(test, buf);
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
/* unset if non inetd looped */
|
|
config->ContentLength = -1;
|
|
#endif
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_CGI
|
|
}
|
|
}
|
|
#endif
|
|
|
|
} while (0);
|
|
|
|
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
/* from inetd don`t looping: freeing, closing automatic from exit always */
|
|
# ifdef DEBUG
|
|
if (config->debugHttpd) fprintf(stderr, "closing socket\n");
|
|
# endif
|
|
# ifdef CONFIG_FEATURE_HTTPD_CGI
|
|
free(body);
|
|
free(cookie);
|
|
# endif
|
|
shutdown(a_c_w, SHUT_WR);
|
|
shutdown(a_c_r, SHUT_RD);
|
|
close(config->accepted_socket);
|
|
#endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */
|
|
}
|
|
|
|
/****************************************************************************
|
|
*
|
|
> $Function: miniHttpd()
|
|
*
|
|
* $Description: The main http server function.
|
|
*
|
|
* Given an open socket fildes, listen for new connections and farm out
|
|
* the processing as a forked process.
|
|
*
|
|
* $Parameters:
|
|
* (int) server. . . The server socket fildes.
|
|
*
|
|
* $Return: (int) . . . . Always 0.
|
|
*
|
|
****************************************************************************/
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
static int miniHttpd(int server)
|
|
{
|
|
fd_set readfd, portfd;
|
|
int nfound;
|
|
|
|
FD_ZERO(&portfd);
|
|
FD_SET(server, &portfd);
|
|
|
|
/* copy the ports we are watching to the readfd set */
|
|
while (1) {
|
|
readfd = portfd;
|
|
|
|
/* Now wait INDEFINATELY on the set of sockets! */
|
|
nfound = select(server + 1, &readfd, 0, 0, 0);
|
|
|
|
switch (nfound) {
|
|
case 0:
|
|
/* select timeout error! */
|
|
break ;
|
|
case -1:
|
|
/* select error */
|
|
break;
|
|
default:
|
|
if (FD_ISSET(server, &readfd)) {
|
|
int on;
|
|
struct sockaddr_in fromAddr;
|
|
|
|
unsigned int addr;
|
|
socklen_t fromAddrLen = sizeof(fromAddr);
|
|
int s = accept(server,
|
|
(struct sockaddr *)&fromAddr, &fromAddrLen);
|
|
|
|
if (s < 0) {
|
|
continue;
|
|
}
|
|
config->accepted_socket = s;
|
|
addr = ntohl(fromAddr.sin_addr.s_addr);
|
|
sprintf(config->rmt_ip, "%u.%u.%u.%u",
|
|
(unsigned char)(addr >> 24),
|
|
(unsigned char)(addr >> 16),
|
|
(unsigned char)(addr >> 8),
|
|
addr & 0xff);
|
|
config->port = ntohs(fromAddr.sin_port);
|
|
#ifdef DEBUG
|
|
if (config->debugHttpd) {
|
|
error_msg("connection from IP=%s, port %u\n",
|
|
config->rmt_ip, config->port);
|
|
}
|
|
#endif
|
|
/* set the KEEPALIVE option to cull dead connections */
|
|
on = 1;
|
|
setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof (on));
|
|
|
|
if (config->debugHttpd || fork() == 0) {
|
|
/* This is the spawned thread */
|
|
handleIncoming();
|
|
if(!config->debugHttpd)
|
|
exit(0);
|
|
}
|
|
close(s);
|
|
}
|
|
}
|
|
} // while (1)
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
/* from inetd */
|
|
|
|
static int miniHttpd(void)
|
|
{
|
|
struct sockaddr_in fromAddrLen;
|
|
socklen_t sinlen = sizeof (struct sockaddr_in);
|
|
unsigned int addr;
|
|
|
|
getpeername (0, (struct sockaddr *)&fromAddrLen, &sinlen);
|
|
addr = ntohl(fromAddrLen.sin_addr.s_addr);
|
|
sprintf(config->rmt_ip, "%u.%u.%u.%u",
|
|
(unsigned char)(addr >> 24),
|
|
(unsigned char)(addr >> 16),
|
|
(unsigned char)(addr >> 8),
|
|
addr & 0xff);
|
|
config->port = ntohs(fromAddrLen.sin_port);
|
|
handleIncoming();
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
|
|
static void sighup_handler(int sig)
|
|
{
|
|
/* set and reset */
|
|
struct sigaction sa;
|
|
|
|
sa.sa_handler = sighup_handler;
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = SA_RESTART;
|
|
sigaction(SIGHUP, &sa, NULL);
|
|
parse_conf(default_patch_httpd_conf,
|
|
sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
|
|
}
|
|
#endif
|
|
|
|
#ifdef HTTPD_STANDALONE
|
|
int main(int argc, char *argv[])
|
|
#else
|
|
int httpd_main(int argc, char *argv[])
|
|
#endif
|
|
{
|
|
const char *home_httpd = home;
|
|
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
int server;
|
|
#endif
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_SETUID
|
|
long uid = -1;
|
|
#endif
|
|
|
|
config = xcalloc(1, sizeof(*config));
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
config->realm = "Web Server Authentication";
|
|
#endif
|
|
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
config->port = 80;
|
|
#endif
|
|
|
|
config->ContentLength = -1;
|
|
|
|
/* check if user supplied a port number */
|
|
for (;;) {
|
|
int c = getopt( argc, argv, "c:h:"
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
"p:v"
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
|
|
"e:"
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_HTTPD_DECODE_URL_STR
|
|
"d:"
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
"r:"
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_HTTPD_SETUID
|
|
"u:"
|
|
#endif
|
|
);
|
|
if (c == EOF) break;
|
|
switch (c) {
|
|
case 'c':
|
|
config->configFile = optarg;
|
|
break;
|
|
case 'h':
|
|
home_httpd = optarg;
|
|
break;
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
case 'v':
|
|
config->debugHttpd = 1;
|
|
break;
|
|
case 'p':
|
|
config->port = atoi(optarg);
|
|
if(config->port <= 0 || config->port > 0xffff)
|
|
error_msg_and_die("invalid %s for -p", optarg);
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_HTTPD_DECODE_URL_STR
|
|
case 'd':
|
|
printf("%s", decodeString(optarg));
|
|
return 0;
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
|
|
case 'e':
|
|
printf("%s", encodeString(optarg));
|
|
return 0;
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
|
|
case 'r':
|
|
config->realm = optarg;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_HTTPD_SETUID
|
|
case 'u':
|
|
{
|
|
char *e;
|
|
|
|
uid = strtol(optarg, &e, 0);
|
|
if(*e != '\0') {
|
|
/* not integer */
|
|
uid = my_getpwnam(optarg);
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
error_msg("%s", httpdVersion);
|
|
show_usage();
|
|
}
|
|
}
|
|
|
|
if(chdir(home_httpd)) {
|
|
perror_msg_and_die("can`t chdir to %s", home_httpd);
|
|
}
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
server = openServer();
|
|
# ifdef CONFIG_FEATURE_HTTPD_SETUID
|
|
/* drop privilegies */
|
|
if(uid > 0)
|
|
setuid(uid);
|
|
# endif
|
|
# ifdef CONFIG_FEATURE_HTTPD_CGI
|
|
addEnvPort("SERVER");
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
|
|
sighup_handler(0);
|
|
#else
|
|
parse_conf(default_patch_httpd_conf, FIRST_PARSE);
|
|
#endif
|
|
|
|
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
|
|
if (!config->debugHttpd) {
|
|
if (daemon(1, 0) < 0) /* don`t change curent directory */
|
|
perror_msg_and_die("daemon");
|
|
}
|
|
return miniHttpd(server);
|
|
#else
|
|
return miniHttpd();
|
|
#endif
|
|
}
|