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busybox/networking/httpd.c
"Vladimir N. Oleynik" 54deebf4e4 destroy bug #421
2005-09-19 10:46:44 +00:00

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/*
* httpd implementation for busybox
*
* Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org>
* Copyright (C) 2003,2004 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.
*
* 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
* presentation. -d decodes a url-encoded argument while -e encodes in html
* for page display.
*
* httpd.conf has the following format:
*
* A:172.20. # Allow address from 172.20.0.0/16
* A:10.0.0.0/25 # Allow any address from 10.0.0.0-10.0.0.127
* A:10.0.0.0/255.255.255.128 # Allow any address that previous set
* 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 insensitive
* 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: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.
*
* 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/1.35 6-Oct-2004";
static const char default_path_httpd_conf[] = "/etc";
static const char httpd_conf[] = "httpd.conf";
static const char home[] = "./";
#ifdef CONFIG_LFS
# define cont_l_fmt "%lld"
#else
# define cont_l_fmt "%ld"
#endif
#define TIMEOUT 60
// Note: busybox 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_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_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_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
#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 HT_ACCESS_IP {
unsigned int ip;
unsigned int mask;
int allow_deny;
struct HT_ACCESS_IP *next;
} Htaccess_IP;
typedef struct
{
char buf[MAX_MEMORY_BUFF];
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
const char *realm;
char *remoteuser;
#endif
const char *query;
#ifdef CONFIG_FEATURE_HTTPD_CGI
char *referer;
#endif
const char *configFile;
unsigned int rmt_ip;
#if defined(CONFIG_FEATURE_HTTPD_CGI) || defined(DEBUG)
char rmt_ip_str[16]; /* for set env REMOTE_ADDR */
#endif
unsigned port; /* server initial port and for
set env REMOTE_PORT */
union HTTPD_FOUND {
const char *found_mime_type;
const char *found_moved_temporarily;
} httpd_found;
off_t ContentLength; /* -1 - unknown */
time_t last_mod;
Htaccess_IP *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
volatile int alarm_signaled;
} HttpdConfig;
static HttpdConfig *config;
static const char request_GET[] = "GET"; /* size algorithic optimize */
static const char* const suffixTable [] = {
/* Warning: shorted equivalent 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_MOVED_TEMPORARILY = 302,
HTTP_BAD_REQUEST = 400, /* malformed syntax */
HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
HTTP_NOT_FOUND = 404,
HTTP_FORBIDDEN = 403,
HTTP_REQUEST_TIMEOUT = 408,
HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
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_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_MOVED_TEMPORARILY, "Found", "Directories must end with a slash." },
{ HTTP_REQUEST_TIMEOUT, "Request Timeout",
"No request appeared within a reasonable time period." },
{ 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_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 int
scan_ip (const char **ep, unsigned int *ip, unsigned char endc)
{
const char *p = *ep;
int auto_mask = 8;
int j;
*ip = 0;
for (j = 0; j < 4; j++) {
unsigned int octet;
if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0)
return -auto_mask;
octet = 0;
while (*p >= '0' && *p <= '9') {
octet *= 10;
octet += *p - '0';
if (octet > 255)
return -auto_mask;
p++;
}
if (*p == '.')
p++;
if (*p != '/' && *p != 0)
auto_mask += 8;
*ip = ((*ip) << 8) | octet;
}
if (*p != 0) {
if (*p != endc)
return -auto_mask;
p++;
if(*p == 0)
return -auto_mask;
}
*ep = p;
return auto_mask;
}
static int
scan_ip_mask (const char *ipm, unsigned int *ip, unsigned int *mask)
{
int i;
unsigned int msk;
i = scan_ip(&ipm, ip, '/');
if(i < 0)
return i;
if(*ipm) {
const char *p = ipm;
i = 0;
while (*p) {
if (*p < '0' || *p > '9') {
if (*p == '.') {
i = scan_ip (&ipm, mask, 0);
return i != 32;
}
return -1;
}
i *= 10;
i += *p - '0';
p++;
}
}
if (i > 32 || i < 0)
return -1;
msk = 0x80000000;
*mask = 0;
while (i > 0) {
*mask |= msk;
msk >>= 1;
i--;
}
return 0;
}
#if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES)
static void free_config_lines(Htaccess **pprev)
{
Htaccess *prev = *pprev;
while( prev ) {
Htaccess *cur = prev;
prev = cur->next;
free(cur);
}
*pprev = NULL;
}
#endif
/* 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;
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
Htaccess *prev, *cur;
#elif CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
Htaccess *cur;
#endif
const char *cf = config->configFile;
char buf[160];
char *p0 = NULL;
char *c, *p;
/* free previous ip setup if present */
Htaccess_IP *pip = config->ip_a_d;
while( pip ) {
Htaccess_IP *cur_ipl = pip;
pip = cur_ipl->next;
free(cur_ipl);
}
config->ip_a_d = NULL;
config->flg_deny_all = 0;
#if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES)
/* 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
#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
free_config_lines(&config->mime_a);
#endif
}
#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' && *p0 != 'A'
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
&& *p0 != '/'
#endif
#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
&& *p0 != '.'
#endif
)
continue;
if(*p0 == 'A' || *p0 == 'D') {
/* storing current config IP line */
pip = calloc(1, sizeof(Htaccess_IP));
if(pip) {
if(scan_ip_mask (c, &(pip->ip), &(pip->mask))) {
/* syntax IP{/mask} error detected, protect all */
*p0 = 'D';
pip->mask = 0;
}
pip->allow_deny = *p0;
if(*p0 == 'D') {
/* Deny:form_IP move top */
pip->next = config->ip_a_d;
config->ip_a_d = pip;
} else {
/* add to bottom A:form_IP config line */
Htaccess_IP *prev_IP = config->ip_a_d;
if(prev_IP == NULL) {
config->ip_a_d = pip;
} else {
while(prev_IP->next)
prev_IP = prev_IP->next;
prev_IP->next = pip;
}
}
}
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
#if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES)
/* 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_CONFIG_WITH_MIME_TYPES
if(*cf == '.') {
/* config .mime line move top for overwrite previous */
cur->next = config->mime_a;
config->mime_a = cur;
continue;
}
#endif
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
free(p0);
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
}
#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 environment 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 = NULL;
const char *underline;
if (!value)
value = "";
underline = *name_after_underline ? "_" : "";
asprintf(&s, "%s%s%s=%s", name_before_underline, underline,
name_after_underline, value);
if(s) {
putenv(s);
}
}
#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_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;
const char *mime_type;
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;
}
}
/* error message is HTML */
mime_type = responseNum == HTTP_OK ?
config->httpd_found.found_mime_type : "text/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, 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(responseNum == HTTP_MOVED_TEMPORARILY) {
len += sprintf(buf+len, "Location: %s/%s%s\r\n",
config->httpd_found.found_moved_temporarily,
(config->query ? "?" : ""),
(config->query ? config->query : ""));
}
if (config->ContentLength != -1) { /* file */
strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod));
len += sprintf(buf+len, "Last-Modified: %s\r\n%s " cont_l_fmt "\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.
*
* $Return: (int) . . . . number of characters read. -1 if error.
*
****************************************************************************/
static int getLine(void)
{
int count = 0;
char *buf = config->buf;
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 /).
* (int bodyLen) . . . . . . . . Length of the post body.
* (const char *cookie) . . . . . For set HTTP_COOKIE.
* (const char *content_type) . . For set CONTENT_TYPE.
*
* $Return: (char *) . . . . A pointer to the decoded string (same as input).
*
* $Errors: None
*
****************************************************************************/
static int sendCgi(const char *url,
const char *request, int bodyLen, const char *cookie,
const char *content_type)
{
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(config->query) {
char *uri = alloca(strlen(purl) + 2 + strlen(config->query));
if(uri)
sprintf(uri, "%s?%s", purl, config->query);
addEnv("REQUEST", "URI", uri);
} else {
addEnv("REQUEST", "URI", purl);
}
if(script != NULL)
*script = '\0'; /* reduce /PATH_INFO */
/* SCRIPT_FILENAME required by PHP in CGI mode */
if(realpath(purl + 1, realpath_buff))
addEnv("SCRIPT", "FILENAME", realpath_buff);
else
*realpath_buff = 0;
/* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
addEnv("SCRIPT_NAME", "", purl);
addEnv("QUERY_STRING", "", config->query);
addEnv("SERVER", "SOFTWARE", httpdVersion);
addEnv("SERVER", "PROTOCOL", "HTTP/1.0");
addEnv("GATEWAY_INTERFACE", "", "CGI/1.1");
addEnv("REMOTE", "ADDR", config->rmt_ip_str);
#ifdef CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
addEnvPort("REMOTE");
#endif
if(bodyLen) {
char sbl[32];
sprintf(sbl, "%d", bodyLen);
addEnv("CONTENT", "LENGTH", sbl);
}
if(cookie)
addEnv("HTTP", "COOKIE", cookie);
if(content_type)
addEnv("CONTENT", "TYPE", content_type);
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
if(config->remoteuser) {
addEnv("REMOTE", "USER", config->remoteuser);
addEnv("AUTH_TYPE", "", "Basic");
}
#endif
if(config->referer)
addEnv("HTTP", "REFERER", config->referer);
/* 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_buff) {
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.
execv(realpath_buff, argp);
}
}
}
#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;
size_t post_readed_size = 0, post_readed_idx = 0;
inFd = fromCgi[0];
outFd = toCgi[1];
close(fromCgi[1]);
close(toCgi[0]);
signal(SIGPIPE, SIG_IGN);
while (1) {
fd_set readSet;
fd_set writeSet;
char wbuf[128];
int nfound;
int count;
FD_ZERO(&readSet);
FD_ZERO(&writeSet);
FD_SET(inFd, &readSet);
if(bodyLen > 0 || post_readed_size > 0) {
FD_SET(outFd, &writeSet);
nfound = outFd > inFd ? outFd : inFd;
if(post_readed_size == 0) {
FD_SET(a_c_r, &readSet);
if(nfound < a_c_r)
nfound = a_c_r;
}
/* Now wait on the set of sockets! */
nfound = select(nfound + 1, &readSet, &writeSet, 0, NULL);
} else {
if(!bodyLen) {
close(outFd);
bodyLen = -1;
}
nfound = select(inFd + 1, &readSet, 0, 0, NULL);
}
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
break;
}
} else if(post_readed_size > 0 && FD_ISSET(outFd, &writeSet)) {
count = bb_full_write(outFd, wbuf + post_readed_idx, post_readed_size);
if(count > 0) {
post_readed_size -= count;
post_readed_idx += count;
if(post_readed_size == 0)
post_readed_idx = 0;
} else {
post_readed_size = post_readed_idx = bodyLen = 0; /* broken pipe to CGI */
}
} else if(bodyLen > 0 && post_readed_size == 0 && FD_ISSET(a_c_r, &readSet)) {
count = bodyLen > sizeof(wbuf) ? sizeof(wbuf) : bodyLen;
count = safe_read(a_c_r, wbuf, count);
if(count > 0) {
post_readed_size += count;
bodyLen -= count;
} else {
bodyLen = 0; /* closed */
}
}
if(FD_ISSET(inFd, &readSet)) {
int s = a_c_w;
char *rbuf = config->buf;
#ifndef PIPE_BUF
# define PIPESIZE 4096 /* amount of buffering in a pipe */
#else
# define PIPESIZE PIPE_BUF
#endif
#if PIPESIZE >= MAX_MEMORY_BUFF
# error "PIPESIZE >= MAX_MEMORY_BUFF"
#endif
// There is something to read
count = safe_read(inFd, rbuf, PIPESIZE);
if (count == 0)
break; /* closed */
if (count > 0) {
if (firstLine) {
rbuf[count] = 0;
/* check to see if the user script added headers */
if(strncmp(rbuf, "HTTP/1.0 200 OK\n", 4) != 0) {
bb_full_write(s, "HTTP/1.0 200 OK\n", 16);
}
if (strstr(rbuf, "ontent-") == 0) {
bb_full_write(s, "Content-type: text/plain\n\n", 26);
}
firstLine = 0;
}
if (bb_full_write(s, rbuf, count) != count)
break;
#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.
*
* $Return: (int) . . . . . . Always 0.
*
****************************************************************************/
static int sendFile(const char *url)
{
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->httpd_found.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->httpd_found.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->httpd_found.found_mime_type);
#endif
f = open(url, O_RDONLY);
if (f >= 0) {
int count;
char *buf = config->buf;
sendHeaders(HTTP_OK);
while ((count = bb_full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
if (bb_full_write(a_c_w, buf, count) != count)
break;
}
close(f);
} else {
#ifdef DEBUG
if (config->debugHttpd)
bb_perror_msg("Unable to open '%s'", url);
#endif
sendHeaders(HTTP_NOT_FOUND);
}
return 0;
}
static int checkPermIP(void)
{
Htaccess_IP * cur;
/* This could stand some work */
for (cur = config->ip_a_d; cur; cur = cur->next) {
#ifdef DEBUG
if (config->debugHttpd) {
fprintf(stderr, "checkPermIP: '%s' ? ", config->rmt_ip_str);
fprintf(stderr, "'%u.%u.%u.%u/%u.%u.%u.%u'\n",
(unsigned char)(cur->ip >> 24),
(unsigned char)(cur->ip >> 16),
(unsigned char)(cur->ip >> 8),
cur->ip & 0xff,
(unsigned char)(cur->mask >> 24),
(unsigned char)(cur->mask >> 16),
(unsigned char)(cur->mask >> 8),
cur->mask & 0xff);
}
#endif
if((config->rmt_ip & cur->mask) == cur->ip)
return cur->allow_deny == 'A'; /* Allow/Deny */
}
/* if unconfigured, return 1 - access from all */
return !config->flg_deny_all;
}
/****************************************************************************
*
> $Function: checkPerm()
*
* $Description: Check the permission file for access password protected.
*
* 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.
* (const char *) request . . . User information to validate.
*
* $Return: (int) . . . . . . . . . 1 if request OK, 0 otherwise.
*
****************************************************************************/
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
static int checkPerm(const char *path, const char *request)
{
Htaccess * cur;
const char *p;
const char *p0;
const char *prev = NULL;
/* This could stand some work */
for (cur = config->auth; cur; cur = cur->next) {
p0 = cur->before_colon;
if(prev != NULL && strcmp(prev, p0) != 0)
continue; /* find next identical */
p = cur->after_colon;
#ifdef DEBUG
if (config->debugHttpd)
fprintf(stderr,"checkPerm: '%s' ? '%s'\n", p0, request);
#endif
{
int l = strlen(p0);
if(strncmp(p0, path, l) == 0 &&
(l == 1 || path[l] == '/' || path[l] == 0)) {
char *u;
/* path match found. Check request */
/* for check next /path:user:password */
prev = p0;
u = strchr(request, ':');
if(u == NULL) {
/* bad request, ':' required */
break;
}
#ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
{
char *cipher;
char *pp;
if(strncmp(p, request, u-request) != 0) {
/* user uncompared */
continue;
}
pp = strchr(p, ':');
if(pp && pp[1] == '$' && pp[2] == '1' &&
pp[3] == '$' && pp[4]) {
pp++;
cipher = pw_encrypt(u+1, pp);
if (strcmp(cipher, pp) == 0)
goto set_remoteuser_var; /* Ok */
/* unauthorized */
continue;
}
}
#endif
if (strcmp(p, request) == 0) {
#ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
set_remoteuser_var:
#endif
config->remoteuser = strdup(request);
if(config->remoteuser)
config->remoteuser[(u - request)] = 0;
return 1; /* Ok */
}
/* unauthorized */
}
}
} /* for */
return prev == NULL;
}
#endif /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */
/****************************************************************************
*
> $Function: handleIncoming()
*
* $Description: Handle an incoming http request.
*
****************************************************************************/
static void
handle_sigalrm( int sig )
{
sendHeaders(HTTP_REQUEST_TIMEOUT);
config->alarm_signaled = sig;
}
/****************************************************************************
*
> $Function: handleIncoming()
*
* $Description: Handle an incoming http request.
*
****************************************************************************/
static void handleIncoming(void)
{
char *buf = config->buf;
char *url;
char *purl;
int blank = -1;
char *test;
struct stat sb;
int ip_allowed;
#ifdef CONFIG_FEATURE_HTTPD_CGI
const char *prequest = request_GET;
long length=0;
char *cookie = 0;
char *content_type = 0;
#endif
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
fd_set s_fd;
struct timeval tv;
int retval;
#endif
struct sigaction sa;
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
int credentials = -1; /* if not requred this is Ok */
#endif
sa.sa_handler = handle_sigalrm;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0; /* no SA_RESTART */
sigaction(SIGALRM, &sa, NULL);
do {
int count;
(void) alarm( TIMEOUT );
if (getLine() <= 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 */
test = strchr(url, '?');
if (test) {
*test++ = 0;
config->query = test;
}
/* 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 URL is directory, adding '/' */
if(test[-1] != '/') {
if ( is_directory(url + 1, 1, &sb) ) {
config->httpd_found.found_moved_temporarily = url;
}
}
#ifdef DEBUG
if (config->debugHttpd)
fprintf(stderr, "url='%s', args=%s\n", url, config->query);
#endif
test = url;
ip_allowed = checkPermIP();
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 = checkPermIP();
}
*test = '/';
}
// read until blank line for HTTP version specified, else parse immediate
while (blank >= 0 && alarm(TIMEOUT) >= 0 && (count = getLine()) > 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);
} else if ((strncasecmp(buf, "Content-Type:", 13) == 0)) {
for(test = buf + 13; isspace(*test); test++)
;
content_type = strdup(test);
} else if ((strncasecmp(buf, "Referer:", 8) == 0)) {
for(test = buf + 8; isspace(*test); test++)
;
config->referer = 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 */
(void) alarm( 0 );
if(config->alarm_signaled)
break;
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
if(config->httpd_found.found_moved_temporarily) {
sendHeaders(HTTP_MOVED_TEMPORARILY);
#ifdef DEBUG
/* clear unforked memory flag */
if(config->debugHttpd)
config->httpd_found.found_moved_temporarily = NULL;
#endif
break;
}
test = url + 1; /* skip first '/' */
#ifdef CONFIG_FEATURE_HTTPD_CGI
/* if strange Content-Length */
if (length < 0)
break;
if (strncmp(test, "cgi-bin", 7) == 0) {
if(test[7] == '/' && test[8] == 0)
goto FORBIDDEN; // protect listing cgi-bin/
sendCgi(url, prequest, length, cookie, content_type);
} 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);
#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(cookie);
free(content_type);
free(config->referer);
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
free(config->remoteuser);
#endif
# endif
shutdown(a_c_w, SHUT_WR);
/* Properly wait for remote to closed */
FD_ZERO (&s_fd) ;
FD_SET (a_c_w, &s_fd) ;
do {
tv.tv_sec = 2 ;
tv.tv_usec = 0 ;
retval = select (a_c_w + 1, &s_fd, NULL, NULL, &tv);
} while (retval > 0 && (read (a_c_w, buf, sizeof (config->buf)) > 0));
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 INDEFINITELY 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;
socklen_t fromAddrLen = sizeof(fromAddr);
int s = accept(server,
(struct sockaddr *)&fromAddr, &fromAddrLen);
if (s < 0) {
continue;
}
config->accepted_socket = s;
config->rmt_ip = ntohl(fromAddr.sin_addr.s_addr);
#if defined(CONFIG_FEATURE_HTTPD_CGI) || defined(DEBUG)
sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
(unsigned char)(config->rmt_ip >> 24),
(unsigned char)(config->rmt_ip >> 16),
(unsigned char)(config->rmt_ip >> 8),
config->rmt_ip & 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_str, config->port);
}
#endif
#endif /* CONFIG_FEATURE_HTTPD_CGI */
/* 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);
} else {
if(!config->debugHttpd)
wait(NULL);
}
close(s);
}
}
} // while (1)
return 0;
}
#else
/* from inetd */
static int miniHttpd(void)
{
struct sockaddr_in fromAddrLen;
socklen_t sinlen = sizeof (struct sockaddr_in);
getpeername (0, (struct sockaddr *)&fromAddrLen, &sinlen);
config->rmt_ip = ntohl(fromAddrLen.sin_addr.s_addr);
#if defined(CONFIG_FEATURE_HTTPD_CGI) || defined(DEBUG)
sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
(unsigned char)(config->rmt_ip >> 24),
(unsigned char)(config->rmt_ip >> 16),
(unsigned char)(config->rmt_ip >> 8),
config->rmt_ip & 0xff);
#endif
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;
parse_conf(default_path_httpd_conf,
sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
sa.sa_handler = sighup_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction(SIGHUP, &sa, NULL);
}
#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 privileges */
if(uid > 0)
setuid(uid);
# endif
#endif
#ifdef CONFIG_FEATURE_HTTPD_CGI
{
char *p = getenv("PATH");
if(p) {
p = bb_xstrdup(p);
}
clearenv();
if(p)
setenv("PATH", p, 1);
# ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
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
}
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