imported original firmware WRT54GL_v4.30.11_11_US

1 files changed, 1915 insertions, 0 deletions

diff --git a/release/src/router/busybox/networking/httpd.c b/release/src/router/busybox/networking/httpd.c
new file mode 100644
index 00000000..d58414b5
--- /dev/null
+++ b/release/src/router/busybox/networking/httpd.c
@@ -0,0 +1,1915 @@
+/*
+ * httpd implementation for busybox
+ *
+ * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org>
+ * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
+ *
+ * simplify patch stolen from libbb without using strdup
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *****************************************************************************
+ *
+ * Typical usage:
+ *   for non root user
+ * httpd -p 8080 -h $HOME/public_html
+ *   or for daemon start from rc script with uid=0:
+ * httpd -u www
+ * This is equivalent if www user have uid=80 to
+ * httpd -p 80 -u 80 -h /www -c /etc/httpd.conf -r "Web Server Authentication"
+ *
+ *
+ * When a url contains "cgi-bin" it is assumed to be a cgi script.  The
+ * server changes directory to the location of the script and executes it
+ * after setting QUERY_STRING and other environment variables.  If url args
+ * are included in the url or as a post, the args are placed into decoded
+ * environment variables.  e.g. /cgi-bin/setup?foo=Hello%20World  will set
+ * the $CGI_foo environment variable to "Hello World" while
+ * CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV enabled.
+ *
+ * The server can also be invoked as a url arg decoder and html text encoder
+ * as follows:
+ *  foo=`httpd -d $foo`           # decode "Hello%20World" as "Hello World"
+ *  bar=`httpd -e "<Hello World>"`  # encode as "&#60Hello&#32World&#62"
+ * Note that url encoding for arguments is not the same as html encoding for
+ * presenation.  -d decodes a url-encoded argument while -e encodes in html
+ * for page display.
+ *
+ * httpd.conf has the following format:
+ * 
+ * A:172.20.         # Allow any address that begins with 172.20
+ * A:10.10.          # Allow any address that begins with 10.10.
+ * A:10.20           # Allow any address that previous set and 10.200-209.X.X
+ * A:127.0.0.1       # Allow local loopback connections
+ * D:*               # Deny from other IP connections
+ * /cgi-bin:foo:bar  # Require user foo, pwd bar on urls starting with /cgi-bin/
+ * /adm:admin:setup  # Require user admin, pwd setup on urls starting with /adm/
+ * /adm:toor:PaSsWd  # or user toor, pwd PaSsWd on urls starting with /adm/
+ * .au:audio/basic   # additional mime type for audio.au files
+ * 
+ * A/D may be as a/d or allow/deny - first char case unsensitive
+ * Deny IP rules take precedence over allow rules.
+ * 
+ * 
+ * The Deny/Allow IP logic:
+ * 
+ *  - Default is to allow all.  No addresses are denied unless
+ * 	   denied with a D: rule.
+ *  - Order of Deny/Allow rules is significant
+ *  - Deny rules take precedence over allow rules.
+ *  - If a deny all rule (D:*) is used it acts as a catch-all for unmatched
+ * 	 addresses.
+ *  - Specification of Allow all (A:*) is a no-op
+ * 
+ * Example:
+ *   1. Allow only specified addresses
+ *     A:172.20.         # Allow any address that begins with 172.20
+ *     A:10.10.          # Allow any address that begins with 10.10.
+ *     A:10.10           # Allow any address that previous set and 10.100-109.X.X
+ *     A:127.0.0.1       # Allow local loopback connections
+ *     D:*               # Deny from other IP connections
+ * 
+ *   2. Only deny specified addresses
+ *     D:1.2.3.        # deny from 1.2.3.0 - 1.2.3.255
+ *     D:2.3.4.        # deny from 2.3.4.0 - 2.3.4.255
+ *     A:*             # (optional line added for clarity)
+ * 
+ * If a sub directory contains a config file it is parsed and merged with
+ * any existing settings as if it was appended to the original configuration
+ * except that all previous IP config rules are discarded.
+ *
+ * subdir paths are relative to the containing subdir and thus cannot
+ * affect the parent rules.
+ *
+ * Note that since the sub dir is parsed in the forked thread servicing the
+ * subdir http request, any merge is discarded when the process exits.  As a
+ * result, the subdir settings only have a lifetime of a single request.
+ *
+ * 
+ * If -c is not set, an attempt will be made to open the default 
+ * root configuration file.  If -c is set and the file is not found, the
+ * server exits with an error.
+ * 
+*/
+
+
+#include <stdio.h>
+#include <ctype.h>         /* for isspace           */
+#include <string.h>
+#include <stdlib.h>        /* for malloc            */
+#include <time.h>
+#include <unistd.h>        /* for close             */
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/socket.h>    /* for connect and socket*/
+#include <netinet/in.h>    /* for sockaddr_in       */
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <fcntl.h>         /* for open modes        */
+#include "busybox.h"
+
+
+static const char httpdVersion[] = "busybox httpd/1.28 22-Jun-2003";
+static const char default_path_httpd_conf[] = "/etc";
+static const char httpd_conf[] = "httpd.conf";
+static const char home[] = "./";
+
+// Note: bussybox xfuncs are not used because we want the server to keep running
+//       if something bad happens due to a malformed user request.
+//       As a result, all memory allocation after daemonize
+//       is checked rigorously
+
+//#define DEBUG 1
+
+/* Configure options, disabled by default as custom httpd feature */
+
+/* disabled as optional features */
+//#define CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
+//#define CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
+//#define CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
+//#define CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
+//#define CONFIG_FEATURE_HTTPD_SETUID
+//#define CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
+
+/* If set, use this server from internet superserver only */
+//#define CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
+
+/* You can use this server as standalone, require libbb.a for linking */
+//#define HTTPD_STANDALONE
+
+/* Config options, disable this for do very small module */
+//#define CONFIG_FEATURE_HTTPD_CGI
+//#define CONFIG_FEATURE_HTTPD_BASIC_AUTH
+//#define CONFIG_FEATURE_HTTPD_AUTH_MD5
+
+#ifdef HTTPD_STANDALONE
+/* standalone, enable all features */
+#undef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
+/* unset config option for remove warning as redefined */
+#undef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+#undef CONFIG_FEATURE_HTTPD_AUTH_MD5
+#undef CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
+#undef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
+#undef CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
+#undef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
+#undef CONFIG_FEATURE_HTTPD_CGI
+#undef CONFIG_FEATURE_HTTPD_SETUID
+#undef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
+/* enable all features now */
+#define CONFIG_FEATURE_HTTPD_BASIC_AUTH
+#define CONFIG_FEATURE_HTTPD_AUTH_MD5
+#define CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
+#define CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
+#define CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
+#define CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
+#define CONFIG_FEATURE_HTTPD_CGI
+#define CONFIG_FEATURE_HTTPD_SETUID
+#define CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
+
+/* require from libbb.a for linking */
+const char *bb_applet_name = "httpd";
+
+void bb_show_usage(void)
+{
+  fprintf(stderr, "Usage: %s [-p <port>] [-c configFile] [-d/-e <string>] "
+		  "[-r realm] [-u user] [-h homedir]\n", bb_applet_name);
+  exit(1);
+}
+#endif
+
+#ifdef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
+#undef CONFIG_FEATURE_HTTPD_SETUID  /* use inetd user.group config settings */
+#undef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP    /* so is not daemon */
+/* inetd set stderr to accepted socket and we can`t true see debug messages */
+#undef DEBUG
+#endif
+
+/* CGI environ size */
+#ifdef CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
+#define ENVSIZE 70    /* set max CGI variable */
+#else
+#define ENVSIZE 15    /* minimal requires */
+#endif
+
+#define MAX_POST_SIZE (64*1024) /* 64k. Its Small? May be ;) */
+
+#define MAX_MEMORY_BUFF 8192    /* IO buffer */
+
+typedef struct HT_ACCESS {
+	char *after_colon;
+	struct HT_ACCESS *next;
+	char before_colon[1];         /* really bigger, must last */
+} Htaccess;
+
+typedef struct
+{
+#ifdef CONFIG_FEATURE_HTTPD_CGI
+  char *envp[ENVSIZE+1];
+  int envCount;
+#endif
+  char buf[MAX_MEMORY_BUFF];
+
+#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+  const char *realm;
+#endif
+  const char *configFile;
+
+  char rmt_ip[16];         /* for set env REMOTE_ADDR */
+  unsigned port;           /* server initial port and for
+			      set env REMOTE_PORT */
+
+  const char *found_mime_type;
+  off_t ContentLength;          /* -1 - unknown */
+  time_t last_mod;
+
+  Htaccess *ip_a_d;             /* config allow/deny lines */
+  int flg_deny_all;
+#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+  Htaccess *auth;               /* config user:password lines */
+#endif
+#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
+  Htaccess *mime_a;             /* config mime types */
+#endif
+
+#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
+  int accepted_socket;
+#define a_c_r config->accepted_socket
+#define a_c_w config->accepted_socket
+  int debugHttpd;          /* if seted, don`t stay daemon */
+#else
+#define a_c_r 0
+#define a_c_w 1
+#endif
+} HttpdConfig;
+
+static HttpdConfig *config;
+
+static const char request_GET[] = "GET";    /* size algorithic optimize */
+
+static const char* const suffixTable [] = {
+/* Warning: shorted equalent suffix in one line must be first */
+  ".htm.html", "text/html",
+  ".jpg.jpeg", "image/jpeg",
+  ".gif", "image/gif",
+  ".png", "image/png",
+  ".txt.h.c.cc.cpp", "text/plain",
+  ".css", "text/css",
+  ".wav", "audio/wav",
+  ".avi", "video/x-msvideo",
+  ".qt.mov", "video/quicktime",
+  ".mpe.mpeg", "video/mpeg",
+  ".mid.midi", "audio/midi",
+  ".mp3", "audio/mpeg",
+#if 0                        /* unpopular */
+  ".au", "audio/basic",
+  ".pac", "application/x-ns-proxy-autoconfig",
+  ".vrml.wrl", "model/vrml",
+#endif
+  0, "application/octet-stream" /* default */
+  };
+
+typedef enum
+{
+  HTTP_OK = 200,
+  HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
+  HTTP_NOT_FOUND = 404,
+  HTTP_NOT_IMPLEMENTED = 501,   /* used for unrecognized requests */
+  HTTP_BAD_REQUEST = 400,       /* malformed syntax */
+  HTTP_FORBIDDEN = 403,
+  HTTP_INTERNAL_SERVER_ERROR = 500,
+#if 0 /* future use */
+  HTTP_CONTINUE = 100,
+  HTTP_SWITCHING_PROTOCOLS = 101,
+  HTTP_CREATED = 201,
+  HTTP_ACCEPTED = 202,
+  HTTP_NON_AUTHORITATIVE_INFO = 203,
+  HTTP_NO_CONTENT = 204,
+  HTTP_MULTIPLE_CHOICES = 300,
+  HTTP_MOVED_PERMANENTLY = 301,
+  HTTP_MOVED_TEMPORARILY = 302,
+  HTTP_NOT_MODIFIED = 304,
+  HTTP_PAYMENT_REQUIRED = 402,
+  HTTP_BAD_GATEWAY = 502,
+  HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
+  HTTP_RESPONSE_SETSIZE=0xffffffff
+#endif
+} HttpResponseNum;
+
+typedef struct
+{
+  HttpResponseNum type;
+  const char *name;
+  const char *info;
+} HttpEnumString;
+
+static const HttpEnumString httpResponseNames[] = {
+  { HTTP_OK, "OK" },
+  { HTTP_NOT_IMPLEMENTED, "Not Implemented",
+    "The requested method is not recognized by this server." },
+#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+  { HTTP_UNAUTHORIZED, "Unauthorized", "" },
+#endif
+  { HTTP_NOT_FOUND, "Not Found",
+    "The requested URL was not found on this server." },
+  { HTTP_BAD_REQUEST, "Bad Request", "Unsupported method." },
+  { HTTP_FORBIDDEN, "Forbidden", "" },
+  { HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error",
+    "Internal Server Error" },
+#if 0                               /* not implemented */
+  { HTTP_CREATED, "Created" },
+  { HTTP_ACCEPTED, "Accepted" },
+  { HTTP_NO_CONTENT, "No Content" },
+  { HTTP_MULTIPLE_CHOICES, "Multiple Choices" },
+  { HTTP_MOVED_PERMANENTLY, "Moved Permanently" },
+  { HTTP_MOVED_TEMPORARILY, "Moved Temporarily" },
+  { HTTP_NOT_MODIFIED, "Not Modified" },
+  { HTTP_BAD_GATEWAY, "Bad Gateway", "" },
+  { HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" },
+#endif
+};
+
+
+static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT";
+static const char Content_length[] = "Content-length:";
+
+
+
+static void free_config_lines(Htaccess **pprev)
+{
+    Htaccess *prev = *pprev;
+
+    while( prev ) {
+	Htaccess *cur = prev;
+
+	prev = cur->next;
+	free(cur);
+    }
+    *pprev = NULL;
+}
+
+/* flag */
+#define FIRST_PARSE          0
+#define SUBDIR_PARSE         1
+#define SIGNALED_PARSE       2
+#define FIND_FROM_HTTPD_ROOT 3
+/****************************************************************************
+ *
+ > $Function: parse_conf()
+ *
+ * $Description: parse configuration file into in-memory linked list.
+ * 
+ * The first non-white character is examined to determine if the config line
+ * is one of the following:
+ *    .ext:mime/type   # new mime type not compiled into httpd
+ *    [adAD]:from      # ip address allow/deny, * for wildcard
+ *    /path:user:pass  # username/password
+ *
+ * Any previous IP rules are discarded.
+ * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
+ * are also discarded.  That is, previous settings are retained if flag is
+ * SUBDIR_PARSE.
+ *
+ * $Parameters:
+ *      (const char *) path . . null for ip address checks, path for password
+ *                              checks.
+ *      (int) flag  . . . . . . the source of the parse request.
+ *
+ * $Return: (None) 
+ *
+ ****************************************************************************/
+static void parse_conf(const char *path, int flag)
+{
+    FILE *f;
+    Htaccess *cur;
+#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+    Htaccess *prev;
+#endif
+
+    const char *cf = config->configFile;
+    char buf[160];
+    char *p0 = NULL;
+    char *c, *p;
+
+    /* free previous ip setup if present */
+    free_config_lines(&config->ip_a_d);
+    config->flg_deny_all = 0;
+    /* retain previous auth and mime config only for subdir parse */
+    if(flag != SUBDIR_PARSE) {
+#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+	free_config_lines(&config->auth)
+#endif
+	;   /* appease compiler warnings if option is not set */
+#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
+	free_config_lines(&config->mime_a);
+#endif
+    }
+
+    if(flag == SUBDIR_PARSE || cf == NULL) {
+	cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
+	if(cf == NULL) {
+	    if(flag == FIRST_PARSE)
+		bb_error_msg_and_die(bb_msg_memory_exhausted);
+	    return;
+	}
+	sprintf((char *)cf, "%s/%s", path, httpd_conf);
+    }
+
+    while((f = fopen(cf, "r")) == NULL) {
+	if(flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
+	    /* config file not found, no changes to config */
+	    return;
+	}
+	if(config->configFile && flag == FIRST_PARSE) /* if -c option given */
+	    bb_perror_msg_and_die("%s", cf);
+	flag = FIND_FROM_HTTPD_ROOT;
+	cf = httpd_conf;
+    }
+
+#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+    prev = config->auth;
+#endif
+    /* This could stand some work */
+    while ( (p0 = fgets(buf, sizeof(buf), f)) != NULL) {
+	c = NULL;
+	for(p = p0; *p0 != 0 && *p0 != '#'; p0++) {
+		if(!isspace(*p0)) {
+		    *p++ = *p0;
+		    if(*p0 == ':' && c == NULL)
+			c = p;
+		}
+	}
+	*p = 0;
+
+	/* test for empty or strange line */
+	if (c == NULL || *c == 0)
+	    continue;
+	p0 = buf;
+	if(*p0 == 'd')
+	    *p0 = 'D';
+	if(*c == '*') {
+	    if(*p0 == 'D') {
+		/* memorize deny all */
+		config->flg_deny_all++;
+	    }
+	    /* skip default other "word:*" config lines */
+	    continue;
+	}
+
+	if(*p0 == 'a')
+	    *p0 = 'A';
+	else if(*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 == '/') {
+	    /* make full path from httpd root / curent_path / config_line_path */
+	    cf = flag == SUBDIR_PARSE ? path : "";
+	    p0 = malloc(strlen(cf) + (c - buf) + 2 + strlen(c));
+	    if(p0 == NULL)
+		continue;
+	    c[-1] = 0;
+	    sprintf(p0, "/%s%s", cf, buf);
+
+	    /* another call bb_simplify_path */
+	    cf = p = p0;
+
+	    do {
+		    if (*p == '/') {
+			if (*cf == '/') {    /* skip duplicate (or initial) slash */
+			    continue;
+			} else if (*cf == '.') {
+			    if (cf[1] == '/' || cf[1] == 0) { /* remove extra '.' */
+				continue;
+			    } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == 0)) {
+				++cf;
+				if (p > p0) {
+				    while (*--p != '/');    /* omit previous dir */
+				}
+				continue;
+			    }
+			}
+		    }
+		    *++p = *cf;
+	    } while (*++cf);
+
+	    if ((p == p0) || (*p != '/')) {      /* not a trailing slash */
+		++p;                             /* so keep last character */
+	    }
+	    *p = 0;
+	    sprintf(p0, "%s:%s", p0, c);
+	}
+#endif
+	/* storing current config line */
+
+	cur = calloc(1, sizeof(Htaccess) + strlen(p0));
+	if(cur) {
+	    cf = strcpy(cur->before_colon, p0);
+	    c = strchr(cf, ':');
+	    *c++ = 0;
+	    cur->after_colon = c;
+#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+	    if(*cf == '/')
+		free(p0);
+#endif
+	    if(*cf == 'A' || *cf == 'D') {
+		if(*cf == 'D') {
+			/* Deny:form_IP move top */
+			cur->next = config->ip_a_d;
+			config->ip_a_d = cur;
+		} else {
+			/* add to bottom A:form_IP config line */
+			Htaccess *prev_IP = config->ip_a_d;
+
+			if(prev_IP == NULL) {
+				config->ip_a_d = cur;
+			} else {
+				while(prev_IP->next)
+					prev_IP = prev_IP->next;
+				prev_IP->next = cur;
+			}
+		}
+	    }
+#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
+	    else if(*cf == '.') {
+		/* config .mime line move top for overwrite previous */
+		cur->next = config->mime_a;
+		config->mime_a = cur;
+	    }
+#endif
+
+#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+	    else if(prev == NULL) {
+		/* first line */
+		config->auth = prev = cur;
+	    } else {
+		/* sort path, if current lenght eq or bigger then move up */
+		Htaccess *prev_hti = config->auth;
+		int l = strlen(cf);
+		Htaccess *hti;
+
+		for(hti = prev_hti; hti; hti = hti->next) {
+		    if(l >= strlen(hti->before_colon)) {
+			/* insert before hti */
+			cur->next = hti;
+			if(prev_hti != hti) {
+			    prev_hti->next = cur;
+			} else {
+			    /* insert as top */
+			    config->auth = cur;
+			}
+			break;
+		    }
+		    if(prev_hti != hti)
+			    prev_hti = prev_hti->next;
+		}
+		if(!hti)  {       /* not inserted, add to bottom */
+		    prev->next = cur;
+		    prev = cur;
+		}
+	    }
+#endif
+	}
+   }
+   fclose(f);
+}
+
+#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 */
+
+/****************************************************************************
+ *
+ > $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.
+ *      (int)    flag   . . . 1 if require decode '+' as ' ' for CGI
+ *
+ * $Return: (char *)  . . . . A pointer to the decoded string (same as input).
+ *
+ * $Errors: None
+ *
+ ****************************************************************************/
+static char *decodeString(char *orig, int flag_plus_to_space)
+{
+  /* note that decoded string is always shorter than original */
+  char *string = orig;
+  char *ptr = string;
+
+  while (*ptr)
+  {
+    if (*ptr == '+' && flag_plus_to_space)    { *string++ = ' '; ptr++; }
+    else if (*ptr != '%') *string++ = *ptr++;
+    else  {
+      unsigned int value;
+      sscanf(ptr+1, "%2X", &value);
+      *string++ = value;
+      ptr += 3;
+    }
+  }
+  *string = '\0';
+  return orig;
+}
+
+
+#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;
+  const char *underline;
+
+  if (config->envCount >= ENVSIZE)
+	return;
+  if (!value)
+	value = "";
+  underline = *name_after_underline ? "_" : "";
+  asprintf(&s, "%s%s%s=%s", name_before_underline, underline,
+					name_after_underline, value);
+  if(s) {
+    config->envp[config->envCount++] = s;
+    config->envp[config->envCount] = 0;
+  }
+}
+
+#if defined(CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV) || !defined(CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY)
+/* 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
+#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;
+  char *namelist; /* space separated list of arg names */
+  if (pargs==0) return;
+
+  /* args are a list of name=value&name2=value2 sequences */
+  namelist = (char *) malloc(strlen(pargs));
+  if (namelist) namelist[0]=0;
+  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, 1));
+    if (*namelist) strcat(namelist, " ");
+    strcat(namelist, name);
+  }
+  free(memargs);
+  if (namelist) {
+    addEnv("CGI", "ARGLIST_", namelist);
+    free(namelist);
+  }
+}
+#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)
+{
+
+  const unsigned char *in = Data;
+  // The decoded size will be at most 3/4 the size of the encoded
+  unsigned long ch = 0;
+  int i = 0;
+
+  while (*in) {
+    int t = *in++;
+
+    if(t >= '0' && t <= '9')
+	t = t - '0' + 52;
+    else if(t >= 'A' && t <= 'Z')
+	t = t - 'A';
+    else if(t >= 'a' && t <= 'z')
+	t = t - 'a' + 26;
+    else if(t == '+')
+	t = 62;
+    else if(t == '/')
+	t = 63;
+    else if(t == '=')
+	t = 0;
+    else
+	continue;
+
+    ch = (ch << 6) | t;
+    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 {
+	bb_perror_msg_and_die("bind");
+    }
+  } else {
+	bb_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 bb_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) bb_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))
+	      bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status));
+	    if (WIFSIGNALED(status))
+	      bb_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 = bb_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) {
+	      bb_full_write(s, "HTTP/1.0 200 OK\n", 16);
+	    }
+	    if (strstr(buf, "ontent-") == 0) {
+	      bb_full_write(s, "Content-type: text/plain\n\n", 26);
+	    }
+	    firstLine=0;
+	  }
+	  bb_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->mime_a; 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 = bb_full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
+		bb_full_write(a_c_w, buf, count);
+	}
+	close(f);
+  } else {
+#ifdef DEBUG
+	if (config->debugHttpd)
+		bb_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.
+ *
+ * $Return: (int)  . . . . . . . . . 1 if request OK, 0 otherwise.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+static int checkPerm(const char *path, const char *request)
+{
+    Htaccess * cur;
+    const char *p;
+    const char *p0;
+
+    int ipaddr = path == NULL;
+    const char *prev = NULL;
+
+    /* This could stand some work */
+    for (cur = ipaddr ? config->ip_a_d : config->auth; cur; cur = cur->next) {
+	p0 = cur->before_colon;
+	if(prev != NULL && strcmp(prev, p0) != 0)
+	    continue;       /* find next identical */
+	p = cur->after_colon;
+#ifdef DEBUG
+	if (config->debugHttpd)
+	    fprintf(stderr,"checkPerm: '%s' ? '%s'\n",
+				(ipaddr ? (*p ? p : "*") : p0), request);
+#endif
+	if(ipaddr) {
+	    if(strncmp(p, request, strlen(p)) != 0)
+		continue;
+	    return *p0 == 'A';   /* Allow/Deny */
+	} else {
+	    int l = strlen(p0);
+
+	    if(strncmp(p0, path, l) == 0 &&
+			    (l == 1 || path[l] == '/' || path[l] == 0)) {
+		/* path match found.  Check request */
+
+		/* for check next /path:user:password */
+		prev = p0;
+#ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
+		{
+			char *cipher;
+			char *pp;
+			char *u = strchr(request, ':');
+
+			if(u == NULL) {
+				/* bad request, ':' required */
+				continue;
+			}
+			if(strncmp(p, request, u-request) != 0) {
+				/* user uncompared */
+				continue;
+			}
+			pp = strchr(p, ':');
+			if(pp && pp[1] == '$' && pp[2] == '1' &&
+						 pp[3] == '$' && pp[4]) {
+				pp++;
+				cipher = pw_encrypt(u+1, pp);
+				if (strcmp(cipher, pp) == 0)
+					return 1;   /* Ok */
+				/* unauthorized */
+				continue;
+			}
+		}
+#endif
+		if (strcmp(p, request) == 0)
+		    return 1;   /* Ok */
+		/* unauthorized */
+	    }
+	}
+    }   /* for */
+
+    if(ipaddr)
+	return !config->flg_deny_all;
+    return prev == NULL;
+}
+
+#else /* ifndef CONFIG_FEATURE_HTTPD_BASIC_AUTH */
+static int checkPermIP(const char *request)
+{
+    Htaccess * cur;
+    const char *p;
+
+    /* This could stand some work */
+    for (cur = config->ip_a_d; cur; cur = cur->next) {
+	p = cur->after_colon;
+#ifdef DEBUG
+	if (config->debugHttpd)
+	    fprintf(stderr, "checkPerm: '%s' ? '%s'\n",
+					(*p ? p : "*"), request);
+#endif
+	if(strncmp(p, request, strlen(p)) == 0)
+	    return *cur->before_colon == 'A';   /* Allow/Deny */
+    }
+
+    /* if uncofigured, return 1 - access from all */
+    return !config->flg_deny_all;
+}
+#define checkPerm(null, request) checkPermIP(request)
+#endif  /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */
+
+
+/****************************************************************************
+ *
+ > $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;
+  int ip_allowed;
+
+#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);
+
+    decodeString(buf, 0);
+    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;
+
+    /* algorithm stolen from libbb bb_simplify_path(),
+       but don`t strdup and reducing trailing slash and protect out root */
+    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;
+    ip_allowed = checkPerm(NULL, config->rmt_ip);
+    while(ip_allowed && (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);
+		ip_allowed = checkPerm(NULL, config->rmt_ip);
+	}
+	*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 || ip_allowed == 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 = bb_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] == '/' && 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;
+
+  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! */
+    if (select(server + 1, &readfd, 0, 0, 0) > 0) {
+      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) {
+	    bb_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 */
+#ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
+	    /* protect reload config, may be confuse checking */
+	    signal(SIGHUP, SIG_IGN);
+#endif
+	    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_path_httpd_conf,
+		    sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
+}
+#endif
+
+
+static const char httpd_opts[]="c:d:h:"
+#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
+				"e:"
+#define OPT_INC_1 1
+#else
+#define OPT_INC_1 0
+#endif
+#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+				"r:"
+# ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
+				"m:"
+# define OPT_INC_2 2
+# else
+# define OPT_INC_2 1
+#endif
+#else
+#define OPT_INC_2 0
+#endif
+#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
+				"p:v"
+#ifdef CONFIG_FEATURE_HTTPD_SETUID
+				"u:"
+#endif
+#endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */
+					;
+
+#define OPT_CONFIG_FILE (1<<0)
+#define OPT_DECODE_URL  (1<<1)
+#define OPT_HOME_HTTPD  (1<<2)
+#define OPT_ENCODE_URL  (1<<(2+OPT_INC_1))
+#define OPT_REALM       (1<<(3+OPT_INC_1))
+#define OPT_MD5         (1<<(4+OPT_INC_1))
+#define OPT_PORT        (1<<(3+OPT_INC_1+OPT_INC_2))
+#define OPT_DEBUG       (1<<(4+OPT_INC_1+OPT_INC_2))
+#define OPT_SETUID      (1<<(5+OPT_INC_1+OPT_INC_2))
+
+
+#ifdef HTTPD_STANDALONE
+int main(int argc, char *argv[])
+#else
+int httpd_main(int argc, char *argv[])
+#endif
+{
+  unsigned long opt;
+  const char *home_httpd = home;
+  char *url_for_decode;
+#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
+  const char *url_for_encode;
+#endif
+#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
+  const char *s_port;
+#endif
+
+#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
+  int server;
+#endif
+
+#ifdef CONFIG_FEATURE_HTTPD_SETUID
+  const char *s_uid;
+  long uid = -1;
+#endif
+
+#ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
+  const char *pass;
+#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;
+
+  opt = bb_getopt_ulflags(argc, argv, httpd_opts,
+			&(config->configFile), &url_for_decode, &home_httpd
+#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
+			, &url_for_encode
+#endif
+#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
+			, &(config->realm)
+# ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
+			, &pass
+# endif
+#endif
+#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
+			, &s_port
+#ifdef CONFIG_FEATURE_HTTPD_SETUID
+			, &s_uid
+#endif
+#endif
+    );
+
+  if(opt & OPT_DECODE_URL) {
+      printf("%s", decodeString(url_for_decode, 1));
+      return 0;
+  }
+#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
+  if(opt & OPT_ENCODE_URL) {
+      printf("%s", encodeString(url_for_encode));
+      return 0;
+  }
+#endif
+#ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
+  if(opt & OPT_MD5) {
+      printf("%s\n", pw_encrypt(pass, "$1$"));
+      return 0;
+  }
+#endif
+#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
+    if(opt & OPT_PORT)
+	config->port = bb_xgetlarg(s_port, 10, 1, 0xffff);
+    config->debugHttpd = opt & OPT_DEBUG;
+#ifdef CONFIG_FEATURE_HTTPD_SETUID
+    if(opt & OPT_SETUID) {
+	char *e;
+
+	uid = strtol(s_uid, &e, 0);
+	if(*e != '\0') {
+		/* not integer */
+		uid = my_getpwnam(s_uid);
+	}
+      }
+#endif
+#endif
+
+  if(chdir(home_httpd)) {
+    bb_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_path_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 */
+	bb_perror_msg_and_die("daemon");
+  }
+  return miniHttpd(server);
+#else
+  return miniHttpd();
+#endif
+}