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hush/networking/httpd.c
Manuel Novoa III cad5364599 Major coreutils update.
2003-03-19 09:13:01 +00:00

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/*
* 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 "%3CHello%20World%3E"
*
* 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:10.10 # 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
/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 shortes path and D:from[^*] automaticaly sorting to top.
All longest path can`t reset user:password if shorted protect setted.
A/D may be as a/d or allow/deny - first char case unsensitive parsed only.
Each subdir can have config file.
For protect as user:pass current subdir and subpathes set from subdir config:
/:user:pass
if not, other subpathes for give effect must have path from httpd root
/current_subdir_path_from_httpd_root/subpath:user:pass
The Deny/Allow IP logic:
1. Allow all:
The config don`t set D: lines
2. Allow from setted only:
see the begin format example
3. Set deny, allow from other:
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:* # allow from other, this line not strongly require
A global and subdirs config merging logic:
allow rules reducing, deny lines strongled.
The algorithm combinations:
4. If current config have
A:from
D:*
subdir config A: lines skiping, D:from - moving top
5. If current config have
D:from
A:*
result config:
D:from current
D:from subdir
A:from subdir
and seting D:* if subdir config have this
If -c don`t setted, used httpd root config, else httpd root config skiped.
Exited with fault if can`t open start config.
For set wide open server, use -c /dev/null ;=)
*/
#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/1.20 31-Jan-2003";
static const char default_patch_httpd_conf[] = "/etc";
static const char httpd_conf[] = "httpd.conf";
static const char home[] = "/www";
// Note: 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 nonstandart httpd feature */
//#define CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
//#define CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
//#define CONFIG_FEATURE_HTTPD_DECODE_URL_STR
/* disabled as not necessary feature */
//#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 seted this you can 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
#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_SET_CGI_VARS_TO_ENV
#undef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
#undef CONFIG_FEATURE_HTTPD_DECODE_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_SET_CGI_VARS_TO_ENV
#define CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
#define CONFIG_FEATURE_HTTPD_DECODE_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]\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 50 /* set max 35 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;
#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
Htaccess *Httpd_conf_parsed;
} 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." },
{ HTTP_UNAUTHORIZED, "Unauthorized", "" },
{ 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
{ 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:";
/*
* sotring to:
* .ext:mime/type
* /path:user:pass
* /path/subdir:user:pass
* D:from
* A:from
* D:*
*/
static int conf_sort(const void *p1, const void *p2)
{
const Htaccess *cl1 = *(const Htaccess **)p1;
const Htaccess *cl2 = *(const Htaccess **)p2;
char c1 = cl1->before_colon[0];
char c2 = cl2->before_colon[0];
int test;
#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
/* .ext line up before other lines for simlify algorithm */
test = c2 == '.';
if(c1 == '.')
return -(!test);
if(test)
return test;
#endif
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
test = c1 == '/';
/* /path line up before A/D lines for simlify algorithm */
if(test) {
if(c2 != '/')
return -test;
/* a shortes path with user:pass must be first */
return strlen(cl1->before_colon) - strlen(cl2->before_colon);
} else if(c2 == '/')
return !test;
#endif
/* D:from must move top */
test = c2 == 'D' && cl2->after_colon[0] != 0;
if(c1 == 'D' && cl1->after_colon[0] != 0) {
return -(!test);
}
if(test)
return test;
/* next lines - A:from */
test = c2 == 'A' && cl2->after_colon[0] != 0;
if(c1 == 'A' && cl1->after_colon[0] != 0) {
return -(!test);
}
if(test)
return test;
/* end lines - D:* */
test = c2 == 'D' && cl2->after_colon[0] == 0;
if(c1 == 'D' && cl1->after_colon[0] == 0) {
return -(!test);
}
#ifdef DEBUG
if(!test)
bb_error_msg_and_die("sort: can`t found compares!");
#endif
return test;
}
/* flag */
#define FIRST_PARSE 0
#define SUBDIR_PARSE 1
#define SIGNALED_PARSE 2
static void parse_conf(const char *path, int flag)
{
#define bc cur->before_colon[0]
#define ac cur->after_colon[0]
FILE *f;
Htaccess *prev;
Htaccess *cur;
const char *cf = config->configFile;
char buf[80];
char *p0 = NULL;
int deny_all = 0; /* default A:* */
int n = 0; /* count config lines */
if(flag == SUBDIR_PARSE || cf == NULL) {
cf = p0 = alloca(strlen(path) + sizeof(httpd_conf) + 2);
if(p0 == NULL) {
if(flag == FIRST_PARSE)
bb_error_msg_and_die(bb_msg_memory_exhausted);
return;
}
sprintf(p0, "%s/%s", path, httpd_conf);
}
while((f = fopen(cf, "r")) == NULL) {
if(flag != FIRST_PARSE)
return; /* subdir config not found */
if(p0 == NULL) /* if -c option gived */
bb_perror_msg_and_die("%s", cf);
p0 = NULL;
cf = httpd_conf; /* set -c ./httpd_conf */
}
prev = config->Httpd_conf_parsed;
if(flag != SUBDIR_PARSE) {
/* free previous setuped */
while( prev ) {
cur = prev;
prev = cur->next;
free(cur);
}
config->Httpd_conf_parsed = prev; /* eq NULL */
} else {
/* parse previous IP logic for merge */
for(cur = prev; cur; cur = cur->next) {
if(bc == 'D' && ac == 0)
deny_all++;
n++;
/* find last for set prev->next of merging */
if(cur != prev)
prev = prev->next;
}
}
/* This could stand some work */
while ( (p0 = fgets(buf, 80, f)) != NULL) {
char *p;
char *colon;
for(p = colon = p0; *p; p++) {
if(*p == '#') {
*p = 0;
break;
}
if(isspace(*p)) {
if(p != p0) {
*p = 0;
break;
}
p0++;
}
else if(*p == ':' && colon <= p0)
colon = p;
}
/* test for empty or strange line */
if (colon <= p0 || colon[1] == 0)
continue;
if(colon[1] == '*')
colon[1] = 0; /* Allow all */
if(*p0 == 'a')
*p0 = 'A';
if(*p0 == 'd')
*p0 = 'D';
if(*p0 != 'A' && *p0 != 'D'
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
&& *p0 != '/'
#endif
#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
&& *p0 != '.'
#endif
)
continue;
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
if(*p0 == '/' && colon[1] == 0) {
/* skip /path:* */
continue;
}
#endif
if(*p0 == 'A' || *p0 == 'D') {
if(colon[1] == 0) {
if(*p0 == 'A' || deny_all != 0)
continue; /* skip default A:* or double D:* */
}
if(deny_all != 0 && *p0 == 'A')
continue; // if previous setted rule D:* skip all subdir A:
}
/* storing current config line */
cur = calloc(1, sizeof(Htaccess) + (p-p0));
if(cur) {
if(*(colon-1) == '/' && (colon-1) != p0)
colon[-1] = 0; // remove last / from /path/
cur->after_colon = strcpy(cur->before_colon, p0);
cur->after_colon += (colon-p0);
*cur->after_colon++ = 0;
if(prev == NULL) {
/* first line */
config->Httpd_conf_parsed = prev = cur;
} else {
prev->next = cur;
prev = cur;
}
n++;
}
}
fclose(f);
if(n > 1) {
/* sorting conf lines */
Htaccess ** pcur; /* array for qsort */
prev = config->Httpd_conf_parsed;
pcur = alloca((n + 1) * sizeof(Htaccess *));
if(pcur == NULL) {
if(flag == FIRST_PARSE)
bb_error_msg_and_die(bb_msg_memory_exhausted);
return;
}
n = 0;
for(cur = prev; cur; cur = cur->next)
pcur[n++] = cur;
pcur[n] = NULL;
qsort(pcur, n, sizeof(Htaccess *), conf_sort);
/* storing sorted config */
config->Httpd_conf_parsed = *pcur;
for(cur = *pcur; cur; cur = cur->next) {
#ifdef DEBUG
bb_error_msg("%s: %s:%s", cf, cur->before_colon, cur->after_colon);
#endif
cur->next = *++pcur;
}
}
}
#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
/****************************************************************************
*
> $Function: encodeString()
*
* $Description: Given a string, html encode special characters.
* This is used for the -e command line option to provide an easy way
* for scripts to encode result data without confusing browsers. The
* returned string pointer is memory allocated by malloc().
*
* $Parameters:
* (const char *) string . . The first string to encode.
*
* $Return: (char *) . . . .. . . A pointer to the encoded string.
*
* $Errors: Returns a null string ("") if memory is not available.
*
****************************************************************************/
static char *encodeString(const char *string)
{
/* take the simple route and encode everything */
/* could possibly scan once to get length. */
int len = strlen(string);
char *out = malloc(len*5 +1);
char *p=out;
char ch;
if (!out) return "";
while ((ch = *string++)) {
// very simple check for what to encode
if (isalnum(ch)) *p++ = ch;
else p += sprintf(p, "&#%d", (unsigned char) ch);
}
*p=0;
return out;
}
#endif /* CONFIG_FEATURE_HTTPD_ENCODE_URL_STR */
#ifdef CONFIG_FEATURE_HTTPD_DECODE_URL_STR
/****************************************************************************
*
> $Function: decodeString()
*
* $Description: Given a URL encoded string, convert it to plain ascii.
* Since decoding always makes strings smaller, the decode is done in-place.
* Thus, callers should strdup() the argument if they do not want the
* argument modified. The return is the original pointer, allowing this
* function to be easily used as arguments to other functions.
*
* $Parameters:
* (char *) string . . . The first string to decode.
*
* $Return: (char *) . . . . A pointer to the decoded string (same as input).
*
* $Errors: None
*
****************************************************************************/
static char *decodeString(char *string)
{
/* note that decoded string is always shorter than original */
char *orig = string;
char *ptr = string;
while (*ptr)
{
if (*ptr == '+') { *string++ = ' '; ptr++; }
else if (*ptr != '%') *string++ = *ptr++;
else {
unsigned int value;
sscanf(ptr+1, "%2X", &value);
*string++ = value;
ptr += 3;
}
}
*string = '\0';
return orig;
}
#endif /* CONFIG_FEATURE_HTTPD_DECODE_URL_STR */
#ifdef CONFIG_FEATURE_HTTPD_CGI
/****************************************************************************
*
> $Function: addEnv()
*
* $Description: Add an enviornment variable setting to the global list.
* A NAME=VALUE string is allocated, filled, and added to the list of
* environment settings passed to the cgi execution script.
*
* $Parameters:
* (char *) name_before_underline - The first part environment variable name.
* (char *) name_after_underline - The second part environment variable name.
* (char *) value . . The value to which the env variable is set.
*
* $Return: (void)
*
* $Errors: Silently returns if the env runs out of space to hold the new item
*
****************************************************************************/
static void addEnv(const char *name_before_underline,
const char *name_after_underline, const char *value)
{
char *s;
if (config->envCount >= ENVSIZE)
return;
if (!value)
value = "";
s = malloc(strlen(name_before_underline) + strlen(name_after_underline) +
strlen(value) + 3);
if (s) {
const char *underline = *name_after_underline ? "_" : "";
sprintf(s,"%s%s%s=%s", name_before_underline, underline,
name_after_underline, value);
config->envp[config->envCount++] = s;
config->envp[config->envCount] = 0;
}
}
/* set environs SERVER_PORT and REMOTE_PORT */
static void addEnvPort(const char *port_name)
{
char buf[16];
sprintf(buf, "%u", config->port);
addEnv(port_name, "PORT", buf);
}
#endif /* CONFIG_FEATURE_HTTPD_CGI */
#ifdef CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
/****************************************************************************
*
> $Function: addEnvCgi
*
* $Description: Create environment variables given a URL encoded arg list.
* For each variable setting the URL encoded arg list, create a corresponding
* environment variable. URL encoded arguments have the form
* name1=value1&name2=value2&name3=&ignores
* from this example, name3 set empty value, tail without '=' skiping
*
* $Parameters:
* (char *) pargs . . . . A pointer to the URL encoded arguments.
*
* $Return: None
*
* $Errors: None
*
****************************************************************************/
static void addEnvCgi(const char *pargs)
{
char *args;
char *memargs;
if (pargs==0) return;
/* args are a list of name=value&name2=value2 sequences */
memargs = args = strdup(pargs);
while (args && *args) {
const char *name = args;
char *value = strchr(args, '=');
if (!value) /* &XXX without '=' */
break;
*value++ = 0;
args = strchr(value, '&');
if (args)
*args++ = 0;
addEnv("CGI", name, decodeString(value));
}
free(memargs);
}
#endif /* CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV */
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
/****************************************************************************
*
> $Function: decodeBase64()
*
> $Description: Decode a base 64 data stream as per rfc1521.
* Note that the rfc states that none base64 chars are to be ignored.
* Since the decode always results in a shorter size than the input, it is
* OK to pass the input arg as an output arg.
*
* $Parameter:
* (char *) Data . . . . A pointer to a base64 encoded string.
* Where to place the decoded data.
*
* $Return: void
*
* $Errors: None
*
****************************************************************************/
static void decodeBase64(char *Data)
{
int i = 0;
static const char base64ToBin[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
const unsigned char *in = Data;
// The decoded size will be at most 3/4 the size of the encoded
unsigned long ch = 0;
while (*in) {
unsigned char conv = 0;
while (*in) {
const char *p64;
p64 = strchr(base64ToBin, *in++);
if(p64 == NULL)
continue;
conv = (p64 - base64ToBin);
break;
}
ch = (ch << 6) | conv;
i++;
if (i== 4) {
*Data++ = (char) (ch >> 16);
*Data++ = (char) (ch >> 8);
*Data++ = (char) ch;
i = 0;
}
}
*Data = 0;
}
#endif
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
/****************************************************************************
*
> $Function: openServer()
*
* $Description: create a listen server socket on the designated port.
*
* $Return: (int) . . . A connection socket. -1 for errors.
*
* $Errors: None
*
****************************************************************************/
static int openServer(void)
{
struct sockaddr_in lsocket;
int fd;
/* create the socket right now */
/* inet_addr() returns a value that is already in network order */
memset(&lsocket, 0, sizeof(lsocket));
lsocket.sin_family = AF_INET;
lsocket.sin_addr.s_addr = INADDR_ANY;
lsocket.sin_port = htons(config->port) ;
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd >= 0) {
/* tell the OS it's OK to reuse a previous address even though */
/* it may still be in a close down state. Allows bind to succeed. */
int on = 1;
#ifdef SO_REUSEPORT
setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (void *)&on, sizeof(on)) ;
#else
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)) ;
#endif
if (bind(fd, (struct sockaddr *)&lsocket, sizeof(lsocket)) == 0) {
listen(fd, 9);
signal(SIGCHLD, SIG_IGN); /* prevent zombie (defunct) processes */
} else {
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->Httpd_conf_parsed; cur; cur = cur->next) {
if(strcmp(cur->before_colon, suffix) == 0) {
config->found_mime_type = cur->after_colon;
break;
}
}
}
#endif /* CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
#ifdef DEBUG
if (config->debugHttpd)
fprintf(stderr, "Sending file '%s' Content-type: %s\n",
url, config->found_mime_type);
#endif
f = open(url, O_RDONLY);
if (f >= 0) {
int count;
sendHeaders(HTTP_OK);
while ((count = 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.
*
****************************************************************************/
static int checkPerm(const char *path, const char *request)
{
Htaccess * cur;
const char *p;
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
int ipaddr = path == NULL;
const char *prev = NULL;
#else
# define ipaddr 1
#endif
/* This could stand some work */
for (cur = config->Httpd_conf_parsed; cur; cur = cur->next) {
const char *p0 = cur->before_colon;
if(*p0 == 'A' || *p0 == 'D') {
if(!ipaddr)
continue;
} else {
if(ipaddr)
continue;
#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
if(*p0 == '.')
continue;
#endif
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
if(prev != NULL && strcmp(prev, p0) != 0)
continue; /* find next identical */
#endif
}
p = cur->after_colon;
#ifdef DEBUG
if (config->debugHttpd)
fprintf(stderr,"checkPerm: '%s' ? '%s'\n",
(ipaddr ? p : p0), request);
#endif
if(ipaddr) {
if(strncmp(p, request, strlen(p)) != 0)
continue;
return *p0 == 'A'; /* Allow/Deny */
}
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
else {
int l = strlen(p0);
if(strncmp(p0, path, l) == 0 &&
(l == 1 || path[l] == '/' || path[l] == 0)) {
/* path match found. Check request */
if (strcmp(p, request) == 0)
return 1; /* Ok */
/* unauthorized, but check next /path:user:password */
prev = p0;
}
}
#endif
} /* for */
#ifndef CONFIG_FEATURE_HTTPD_BASIC_AUTH
/* if uncofigured, return 1 - access from all */
return 1;
#else
return prev == NULL;
#endif
}
/****************************************************************************
*
> $Function: handleIncoming()
*
* $Description: Handle an incoming http request.
*
****************************************************************************/
static void handleIncoming(void)
{
char *buf = config->buf;
char *url;
char *purl;
int blank = -1;
char *urlArgs;
#ifdef CONFIG_FEATURE_HTTPD_CGI
const char *prequest = request_GET;
char *body = 0;
long length=0;
char *cookie = 0;
#endif
char *test;
struct stat sb;
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
int credentials = -1; /* if not requred this is Ok */
#endif
do {
int count;
if (getLine(buf) <= 0)
break; /* closed */
purl = strpbrk(buf, " \t");
if(purl == NULL) {
BAD_REQUEST:
sendHeaders(HTTP_BAD_REQUEST);
break;
}
*purl = 0;
#ifdef CONFIG_FEATURE_HTTPD_CGI
if(strcasecmp(buf, prequest) != 0) {
prequest = "POST";
if(strcasecmp(buf, prequest) != 0) {
sendHeaders(HTTP_NOT_IMPLEMENTED);
break;
}
}
#else
if(strcasecmp(buf, request_GET) != 0) {
sendHeaders(HTTP_NOT_IMPLEMENTED);
break;
}
#endif
*purl = ' ';
count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank);
if (count < 1 || buf[0] != '/') {
/* Garbled request/URL */
goto BAD_REQUEST;
}
url = alloca(strlen(buf) + 12); /* + sizeof("/index.html\0") */
if(url == NULL) {
sendHeaders(HTTP_INTERNAL_SERVER_ERROR);
break;
}
strcpy(url, buf);
/* extract url args if present */
urlArgs = strchr(url, '?');
if (urlArgs) {
*urlArgs++ = 0; /* next code can set '/' to this pointer,
but CGI script can`t be a directory */
}
/* algorithm stolen from libbb bb_simplify_path(),
but don`t strdup and reducing trailing slash */
purl = test = url;
do {
if (*purl == '/') {
if (*test == '/') { /* skip duplicate (or initial) slash */
continue;
} else if (*test == '.') {
if (test[1] == '/' || test[1] == 0) { /* skip extra '.' */
continue;
} else if ((test[1] == '.') && (test[2] == '/' || test[2] == 0)) {
++test;
if (purl == url) {
/* protect out root */
goto BAD_REQUEST;
}
while (*--purl != '/'); /* omit previous dir */
continue;
}
}
}
*++purl = *test;
} while (*++test);
*++purl = 0; /* so keep last character */
test = purl; /* end ptr */
/* If URL is directory, adding '/' */
if(test[-1] != '/') {
if ( is_directory(url + 1, 1, &sb) ) {
*test++ = '/';
*test = 0;
purl = test; /* end ptr */
}
}
#ifdef DEBUG
if (config->debugHttpd)
fprintf(stderr, "url='%s', args=%s\n", url, urlArgs);
#endif
test = url;
while((test = strchr( test + 1, '/' )) != NULL) {
/* have path1/path2 */
*test = '\0';
if( is_directory(url + 1, 1, &sb) ) {
/* may be having subdir config */
parse_conf(url + 1, SUBDIR_PARSE);
}
*test = '/';
}
// read until blank line for HTTP version specified, else parse immediate
while (blank >= 0 && (count = getLine(buf)) > 0) {
#ifdef DEBUG
if (config->debugHttpd) fprintf(stderr, "Header: '%s'\n", buf);
#endif
#ifdef CONFIG_FEATURE_HTTPD_CGI
/* try and do our best to parse more lines */
if ((strncasecmp(buf, Content_length, 15) == 0)) {
if(prequest != request_GET)
length = strtol(buf + 15, 0, 0); // extra read only for POST
} else if ((strncasecmp(buf, "Cookie:", 7) == 0)) {
for(test = buf + 7; isspace(*test); test++)
;
cookie = strdup(test);
}
#endif
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
if (strncasecmp(buf, "Authorization:", 14) == 0) {
/* We only allow Basic credentials.
* It shows up as "Authorization: Basic <userid:password>" where
* the userid:password is base64 encoded.
*/
for(test = buf + 14; isspace(*test); test++)
;
if (strncasecmp(test, "Basic", 5) != 0)
continue;
test += 5; /* decodeBase64() skiping space self */
decodeBase64(test);
credentials = checkPerm(url, test);
}
#endif /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */
} /* while extra header reading */
if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 ||
checkPerm(NULL, config->rmt_ip) == 0) {
/* protect listing [/path]/httpd_conf or IP deny */
#ifdef CONFIG_FEATURE_HTTPD_CGI
FORBIDDEN: /* protect listing /cgi-bin */
#endif
sendHeaders(HTTP_FORBIDDEN);
break;
}
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
if (credentials <= 0 && checkPerm(url, ":") == 0) {
sendHeaders(HTTP_UNAUTHORIZED);
break;
}
#endif
test = url + 1; /* skip first '/' */
#ifdef CONFIG_FEATURE_HTTPD_CGI
/* if strange Content-Length */
if (length < 0 || length > MAX_POST_SIZE)
break;
if (length > 0) {
body = malloc(length + 1);
if (body) {
length = 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] == 0 || (test[7] == '/' && test[8] == 0))
goto FORBIDDEN; // protect listing cgi-bin
sendCgi(url, prequest, urlArgs, body, length, cookie);
} else {
if (prequest != request_GET)
sendHeaders(HTTP_NOT_IMPLEMENTED);
else {
#endif /* CONFIG_FEATURE_HTTPD_CGI */
if(purl[-1] == '/')
strcpy(purl, "index.html");
if ( stat(test, &sb ) == 0 ) {
config->ContentLength = sb.st_size;
config->last_mod = sb.st_mtime;
}
sendFile(test, buf);
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
/* unset if non inetd looped */
config->ContentLength = -1;
#endif
#ifdef CONFIG_FEATURE_HTTPD_CGI
}
}
#endif
} while (0);
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
/* from inetd don`t looping: freeing, closing automatic from exit always */
# ifdef DEBUG
if (config->debugHttpd) fprintf(stderr, "closing socket\n");
# endif
# ifdef CONFIG_FEATURE_HTTPD_CGI
free(body);
free(cookie);
# endif
shutdown(a_c_w, SHUT_WR);
shutdown(a_c_r, SHUT_RD);
close(config->accepted_socket);
#endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */
}
/****************************************************************************
*
> $Function: miniHttpd()
*
* $Description: The main http server function.
*
* Given an open socket fildes, listen for new connections and farm out
* the processing as a forked process.
*
* $Parameters:
* (int) server. . . The server socket fildes.
*
* $Return: (int) . . . . Always 0.
*
****************************************************************************/
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
static int miniHttpd(int server)
{
fd_set readfd, portfd;
int nfound;
FD_ZERO(&portfd);
FD_SET(server, &portfd);
/* copy the ports we are watching to the readfd set */
while (1) {
readfd = portfd;
/* Now wait INDEFINATELY on the set of sockets! */
nfound = select(server + 1, &readfd, 0, 0, 0);
switch (nfound) {
case 0:
/* select timeout error! */
break ;
case -1:
/* select error */
break;
default:
if (FD_ISSET(server, &readfd)) {
int on;
struct sockaddr_in fromAddr;
unsigned int addr;
socklen_t fromAddrLen = sizeof(fromAddr);
int s = accept(server,
(struct sockaddr *)&fromAddr, &fromAddrLen);
if (s < 0) {
continue;
}
config->accepted_socket = s;
addr = ntohl(fromAddr.sin_addr.s_addr);
sprintf(config->rmt_ip, "%u.%u.%u.%u",
(unsigned char)(addr >> 24),
(unsigned char)(addr >> 16),
(unsigned char)(addr >> 8),
addr & 0xff);
config->port = ntohs(fromAddr.sin_port);
#ifdef DEBUG
if (config->debugHttpd) {
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 */
handleIncoming();
if(!config->debugHttpd)
exit(0);
}
close(s);
}
}
} // while (1)
return 0;
}
#else
/* from inetd */
static int miniHttpd(void)
{
struct sockaddr_in fromAddrLen;
socklen_t sinlen = sizeof (struct sockaddr_in);
unsigned int addr;
getpeername (0, (struct sockaddr *)&fromAddrLen, &sinlen);
addr = ntohl(fromAddrLen.sin_addr.s_addr);
sprintf(config->rmt_ip, "%u.%u.%u.%u",
(unsigned char)(addr >> 24),
(unsigned char)(addr >> 16),
(unsigned char)(addr >> 8),
addr & 0xff);
config->port = ntohs(fromAddrLen.sin_port);
handleIncoming();
return 0;
}
#endif /* CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY */
#ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
static void sighup_handler(int sig)
{
/* set and reset */
struct sigaction sa;
sa.sa_handler = sighup_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction(SIGHUP, &sa, NULL);
parse_conf(default_patch_httpd_conf,
sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
}
#endif
#ifdef HTTPD_STANDALONE
int main(int argc, char *argv[])
#else
int httpd_main(int argc, char *argv[])
#endif
{
const char *home_httpd = home;
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
int server;
#endif
#ifdef CONFIG_FEATURE_HTTPD_SETUID
long uid = -1;
#endif
config = xcalloc(1, sizeof(*config));
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
config->realm = "Web Server Authentication";
#endif
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
config->port = 80;
#endif
config->ContentLength = -1;
/* check if user supplied a port number */
for (;;) {
int c = getopt( argc, argv, "c:h:"
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
"p:v"
#endif
#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
"e:"
#endif
#ifdef CONFIG_FEATURE_HTTPD_DECODE_URL_STR
"d:"
#endif
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
"r:"
#endif
#ifdef CONFIG_FEATURE_HTTPD_SETUID
"u:"
#endif
);
if (c == EOF) break;
switch (c) {
case 'c':
config->configFile = optarg;
break;
case 'h':
home_httpd = optarg;
break;
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
case 'v':
config->debugHttpd = 1;
break;
case 'p':
config->port = atoi(optarg);
if(config->port <= 0 || config->port > 0xffff)
bb_error_msg_and_die("invalid %s for -p", optarg);
break;
#endif
#ifdef CONFIG_FEATURE_HTTPD_DECODE_URL_STR
case 'd':
printf("%s", decodeString(optarg));
return 0;
#endif
#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
case 'e':
printf("%s", encodeString(optarg));
return 0;
#endif
#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
case 'r':
config->realm = optarg;
break;
#endif
#ifdef CONFIG_FEATURE_HTTPD_SETUID
case 'u':
{
char *e;
uid = strtol(optarg, &e, 0);
if(*e != '\0') {
/* not integer */
uid = my_getpwnam(optarg);
}
}
break;
#endif
default:
bb_error_msg("%s", httpdVersion);
bb_show_usage();
}
}
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_patch_httpd_conf, FIRST_PARSE);
#endif
#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
if (!config->debugHttpd) {
if (daemon(1, 0) < 0) /* don`t change curent directory */
bb_perror_msg_and_die("daemon");
}
return miniHttpd(server);
#else
return miniHttpd();
#endif
}
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