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4185548984
hush/networking/httpd.c
Denis Vlasenko 4185548984 httpd: CGI Status: header fix
2007-08-11 20:26:02 +00:00

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/* vi: set sw=4 ts=4: */
/*
* httpd implementation for busybox
*
* Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org>
* Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru>
*
* simplify patch stolen from libbb without using strdup
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
*****************************************************************************
*
* 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.
*
* Doc:
* "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html
*
* 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
* *.php:/path/php # running cgi.php scripts through an interpreter
*
* 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 "libbb.h"
/* amount of buffering in a pipe */
#ifndef PIPE_BUF
# define PIPE_BUF 4096
#endif
static const char default_path_httpd_conf[] = "/etc";
static const char httpd_conf[] = "httpd.conf";
#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
#define DEBUG 0
#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 ip;
unsigned mask;
int allow_deny;
struct HT_ACCESS_IP *next;
} Htaccess_IP;
struct globals {
int server_socket;
int accepted_socket;
volatile smallint alarm_signaled;
smallint flg_deny_all;
const char *g_query;
const char *configFile;
const char *home_httpd;
unsigned rmt_ip;
const char *found_mime_type;
const char *found_moved_temporarily;
off_t ContentLength; /* -1 - unknown */
time_t last_mod;
Htaccess_IP *ip_a_d; /* config allow/deny lines */
USE_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
USE_FEATURE_HTTPD_CGI(char *referer;)
USE_FEATURE_HTTPD_CGI(char *user_agent;)
#if ENABLE_FEATURE_HTTPD_CGI || DEBUG
char *rmt_ip_str; /* for set env REMOTE_ADDR */
#endif
unsigned tcp_port; /* server initial port and for
set env REMOTE_PORT */
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
Htaccess *g_auth; /* config user:password lines */
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
Htaccess *mime_a; /* config mime types */
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
Htaccess *script_i; /* config script interpreters */
#endif
char iobuf[MAX_MEMORY_BUFF];
};
#define G (*ptr_to_globals)
#define server_socket (G.server_socket )
#define accepted_socket (G.accepted_socket)
#define alarm_signaled (G.alarm_signaled )
#define flg_deny_all (G.flg_deny_all )
#define g_query (G.g_query )
#define configFile (G.configFile )
#define home_httpd (G.home_httpd )
#define rmt_ip (G.rmt_ip )
#define found_mime_type (G.found_mime_type)
#define found_moved_temporarily (G.found_moved_temporarily)
#define ContentLength (G.ContentLength )
#define last_mod (G.last_mod )
#define ip_a_d (G.ip_a_d )
#define g_realm (G.g_realm )
#define remoteuser (G.remoteuser )
#define referer (G.referer )
#define user_agent (G.user_agent )
#if ENABLE_FEATURE_HTTPD_CGI || DEBUG
#define rmt_ip_str (G.rmt_ip_str )
#endif
#define tcp_port (G.tcp_port )
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
#define g_auth (G.g_auth )
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
#define mime_a (G.mime_a )
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
#define script_i (G.script_i )
#endif
#define iobuf (G.iobuf )
#define INIT_G() do { \
PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
tcp_port = 80; \
ContentLength = -1; \
} while (0)
static const char request_GET[] = "GET"; /* size algorithmic 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", NULL },
{ 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." },
#if ENABLE_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";
#define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
static int scan_ip(const char **ep, unsigned *ip, unsigned char endc)
{
const char *p = *ep;
int auto_mask = 8;
int j;
*ip = 0;
for (j = 0; j < 4; j++) {
unsigned 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 *ip, unsigned *mask)
{
int i;
unsigned 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 ENABLE_FEATURE_HTTPD_BASIC_AUTH \
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
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;
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
Htaccess *prev;
#endif
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
Htaccess *cur;
#endif
const char *cf = configFile;
char buf[160];
char *p0 = NULL;
char *c, *p;
/* free previous ip setup if present */
Htaccess_IP *pip = ip_a_d;
while (pip) {
Htaccess_IP *cur_ipl = pip;
pip = cur_ipl->next;
free(cur_ipl);
}
ip_a_d = NULL;
flg_deny_all = 0;
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
/* retain previous auth and mime config only for subdir parse */
if (flag != SUBDIR_PARSE) {
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
free_config_lines(&g_auth);
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
free_config_lines(&mime_a);
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
free_config_lines(&script_i);
#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 (configFile && flag == FIRST_PARSE) /* if -c option given */
bb_perror_msg_and_die("%s", cf);
flag = FIND_FROM_HTTPD_ROOT;
cf = httpd_conf;
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
prev = g_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 */
flg_deny_all = 1;
}
/* skip default other "word:*" config lines */
continue;
}
if (*p0 == 'a')
*p0 = 'A';
else if (*p0 != 'D' && *p0 != 'A'
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
&& *p0 != '/'
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
&& *p0 != '.'
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
&& *p0 != '*'
#endif
)
continue;
if (*p0 == 'A' || *p0 == 'D') {
/* storing current config IP line */
pip = xzalloc(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 = ip_a_d;
ip_a_d = pip;
} else {
/* add to bottom A:form_IP config line */
Htaccess_IP *prev_IP = ip_a_d;
if (prev_IP == NULL) {
ip_a_d = pip;
} else {
while (prev_IP->next)
prev_IP = prev_IP->next;
prev_IP->next = pip;
}
}
}
continue;
}
#if ENABLE_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 ENABLE_FEATURE_HTTPD_BASIC_AUTH \
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
/* storing current config line */
cur = xzalloc(sizeof(Htaccess) + strlen(p0));
if (cur) {
cf = strcpy(cur->before_colon, p0);
c = strchr(cf, ':');
*c++ = 0;
cur->after_colon = c;
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
if (*cf == '.') {
/* config .mime line move top for overwrite previous */
cur->next = mime_a;
mime_a = cur;
continue;
}
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
if (*cf == '*' && cf[1] == '.') {
/* config script interpreter line move top for overwrite previous */
cur->next = script_i;
script_i = cur;
continue;
}
#endif
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
free(p0);
if (prev == NULL) {
/* first line */
g_auth = prev = cur;
} else {
/* sort path, if current lenght eq or bigger then move up */
Htaccess *prev_hti = g_auth;
size_t 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 */
g_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);
}
#if ENABLE_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 = xmalloc(len * 6 + 1);
char *p = out;
char ch;
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 /* 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) option_d . . 1 if called for httpd -d
*
* $Return: (char *) . . . . A pointer to the decoded string (same as input).
*
* $Errors: None
*
****************************************************************************/
static char *decodeString(char *orig, int option_d)
{
/* note that decoded string is always shorter than original */
char *string = orig;
char *ptr = string;
char c;
while ((c = *ptr++) != '\0') {
unsigned value1, value2;
if (option_d && c == '+') {
*string++ = ' ';
continue;
}
if (c != '%') {
*string++ = c;
continue;
}
if (sscanf(ptr, "%1X", &value1) != 1
|| sscanf(ptr+1, "%1X", &value2) != 1
) {
if (!option_d)
return NULL;
*string++ = '%';
continue;
}
value1 = value1 * 16 + value2;
if (!option_d && (value1 == '/' || value1 == '\0')) {
/* caller takes it as indication of invalid
* (dangerous wrt exploits) chars */
return orig + 1;
}
*string++ = value1;
ptr += 2;
}
*string = '\0';
return orig;
}
#if ENABLE_FEATURE_HTTPD_CGI
/****************************************************************************
* setenv helpers
****************************************************************************/
static void setenv1(const char *name, const char *value)
{
if (!value)
value = "";
setenv(name, value, 1);
}
static void setenv_long(const char *name, long value)
{
char buf[sizeof(value)*3 + 1];
sprintf(buf, "%ld", value);
setenv(name, buf, 1);
}
#endif
#if ENABLE_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 = (const unsigned char *)Data;
// The decoded size will be at most 3/4 the size of the encoded
unsigned 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
/****************************************************************************
*
> $Function: openServer()
*
* $Description: create a listen server socket on the designated port.
*
* $Return: (int) . . . A connection socket. -1 for errors.
*
* $Errors: None
*
****************************************************************************/
#if BB_MMU
static int openServer(void)
{
int fd;
/* create the socket right now */
fd = create_and_bind_stream_or_die(NULL, tcp_port);
xlisten(fd, 9);
return fd;
}
#endif
/****************************************************************************
*
> $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 = iobuf;
const char *responseString = "";
const char *infoString = 0;
const char *mime_type;
unsigned i;
time_t timer = time(0);
char timeStr[80];
int len;
for (i = 0; i < ARRAY_SIZE(httpResponseNames); i++) {
if (httpResponseNames[i].type == responseNum) {
responseString = httpResponseNames[i].name;
infoString = httpResponseNames[i].info;
break;
}
}
/* error message is HTML */
mime_type = responseNum == HTTP_OK ?
found_mime_type : "text/html";
/* emit the current date */
strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer));
len = sprintf(buf,
"HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
"Date: %s\r\nConnection: close\r\n",
responseNum, responseString, mime_type, timeStr);
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
if (responseNum == HTTP_UNAUTHORIZED) {
len += sprintf(buf+len,
"WWW-Authenticate: Basic realm=\"%s\"\r\n",
g_realm);
}
#endif
if (responseNum == HTTP_MOVED_TEMPORARILY) {
len += sprintf(buf+len, "Location: %s/%s%s\r\n",
found_moved_temporarily,
(g_query ? "?" : ""),
(g_query ? g_query : ""));
}
if (ContentLength != -1) { /* file */
strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&last_mod));
len += sprintf(buf+len, "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
timeStr, "Content-length:", 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);
}
if (DEBUG)
fprintf(stderr, "headers: '%s'\n", buf);
i = accepted_socket;
if (i == 0) i++; /* write to fd# 1 in inetd mode */
return full_write(i, 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 = iobuf;
while (read(accepted_socket, 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 overflow */
count++;
}
if (count) return count;
else return -1;
}
#if ENABLE_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)
{
struct { int rd; int wr; } fromCgi; /* CGI -> httpd pipe */
struct { int rd; int wr; } toCgi; /* httpd -> CGI pipe */
char *fullpath;
char *argp[] = { NULL, NULL };
int pid = 0;
int inFd;
int outFd;
int buf_count;
int status;
size_t post_read_size, post_read_idx;
if (pipe(&fromCgi.rd) != 0)
return 0;
if (pipe(&toCgi.rd) != 0)
return 0;
/*
* Note: We can use vfork() here in the no-mmu case, although
* the child modifies the parent's variables, due to:
* 1) The parent does not use the child-modified variables.
* 2) The allocated memory (in the child) is freed when the process
* exits. This happens instantly after the child finishes,
* since httpd is run from inetd (and it can't run standalone
* in uClinux).
*/
// FIXME: setenv leaks memory! (old values of env vars are leaked)
// Thus we have a bug on NOMMU.
// Need to use this instead:
// [malloc +] putenv + (in child: exec) + (in parent: unsetenv [+ free])
#if !BB_MMU
fullpath = NULL;
pid = vfork();
#else
pid = fork();
#endif
if (pid < 0)
return 0;
if (!pid) {
/* child process */
char *script;
char *purl;
if (accepted_socket > 1)
close(accepted_socket);
if (server_socket > 1)
close(server_socket);
xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
close(fromCgi.rd);
close(toCgi.wr);
/* Huh? User seeing stderr can be a security problem.
* If CGI really wants that, it can always dup2(1,2). */
/* dup2(1, 2); */
/*
* Find PATH_INFO.
*/
xfunc_error_retval = 242;
purl = xstrdup(url);
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 '/' */
}
setenv1("PATH_INFO", script); /* set /PATH_INFO or "" */
setenv1("REQUEST_METHOD", request);
if (g_query) {
char *uri = alloca(strlen(purl) + 2 + strlen(g_query));
if (uri)
sprintf(uri, "%s?%s", purl, g_query);
setenv1("REQUEST_URI", uri);
} else {
setenv1("REQUEST_URI", purl);
}
if (script != NULL)
*script = '\0'; /* cut off /PATH_INFO */
/* SCRIPT_FILENAME required by PHP in CGI mode */
fullpath = concat_path_file(home_httpd, purl);
setenv1("SCRIPT_FILENAME", fullpath);
/* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
setenv1("SCRIPT_NAME", purl);
/* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
* QUERY_STRING: The information which follows the ? in the URL
* which referenced this script. This is the query information.
* It should not be decoded in any fashion. This variable
* should always be set when there is query information,
* regardless of command line decoding. */
/* (Older versions of bbox seem to do some decoding) */
setenv1("QUERY_STRING", g_query);
putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
/* Having _separate_ variables for IP and port defeats
* the purpose of having socket abstraction. Which "port"
* are you using on Unix domain socket?
* IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
* Oh well... */
{
char *p = rmt_ip_str ? : (char*)"";
char *cp = strrchr(p, ':');
if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
cp = NULL;
if (cp) *cp = '\0'; /* delete :PORT */
setenv1("REMOTE_ADDR", p);
if (cp) *cp = ':';
}
setenv1("HTTP_USER_AGENT", user_agent);
#if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
setenv_long("REMOTE_PORT", tcp_port);
#endif
if (bodyLen)
setenv_long("CONTENT_LENGTH", bodyLen);
if (cookie)
setenv1("HTTP_COOKIE", cookie);
if (content_type)
setenv1("CONTENT_TYPE", content_type);
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
if (remoteuser) {
setenv1("REMOTE_USER", remoteuser);
putenv((char*)"AUTH_TYPE=Basic");
}
#endif
if (referer)
setenv1("HTTP_REFERER", referer);
/* set execve argp[0] without path */
argp[0] = (char*)bb_basename(purl);
/* but script argp[0] must have absolute path and chdiring to this */
script = strrchr(fullpath, '/');
if (!script)
goto error_execing_cgi;
*script = '\0';
if (chdir(fullpath) == 0) {
// Now run the program. If it fails,
// use _exit() so no destructors
// get called and make a mess.
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
char *interpr = NULL;
char *suffix = strrchr(purl, '.');
if (suffix) {
Htaccess *cur;
for (cur = script_i; cur; cur = cur->next) {
if (strcmp(cur->before_colon + 1, suffix) == 0) {
interpr = cur->after_colon;
break;
}
}
}
#endif
*script = '/';
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
if (interpr)
execv(interpr, argp);
else
#endif
execv(fullpath, argp);
}
error_execing_cgi:
/* send to stdout (even if we are not from inetd) */
accepted_socket = 1;
sendHeaders(HTTP_NOT_FOUND);
_exit(242);
} /* end child */
/* parent process */
#if !BB_MMU
free(fullpath);
#endif
buf_count = 0;
post_read_size = 0;
post_read_idx = 0; /* for gcc */
inFd = fromCgi.rd;
outFd = toCgi.wr;
close(fromCgi.wr);
close(toCgi.rd);
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_read_size > 0) {
FD_SET(outFd, &writeSet);
nfound = outFd > inFd ? outFd : inFd;
if (post_read_size == 0) {
FD_SET(accepted_socket, &readSet);
if (nfound < accepted_socket)
nfound = accepted_socket;
}
/* Now wait on the set of sockets! */
nfound = select(nfound + 1, &readSet, &writeSet, NULL, NULL);
} else {
if (!bodyLen) {
close(outFd); /* no more POST data to CGI */
bodyLen = -1;
}
nfound = select(inFd + 1, &readSet, NULL, NULL, NULL);
}
if (nfound <= 0) {
if (waitpid(pid, &status, WNOHANG) <= 0) {
/* Weird. CGI didn't exit and no fd's
* are ready, yet select returned?! */
continue;
}
close(inFd);
if (DEBUG && WIFEXITED(status))
bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status));
if (DEBUG && WIFSIGNALED(status))
bb_error_msg("piped has exited with signal=%d", WTERMSIG(status));
break;
}
if (post_read_size > 0 && FD_ISSET(outFd, &writeSet)) {
/* Have data from peer and can write to CGI */
// huh? why full_write? what if we will block?
// (imagine that CGI does not read its stdin...)
count = full_write(outFd, wbuf + post_read_idx, post_read_size);
if (count > 0) {
post_read_idx += count;
post_read_size -= count;
} else {
post_read_size = bodyLen = 0; /* broken pipe to CGI */
}
} else if (bodyLen > 0 && post_read_size == 0
&& FD_ISSET(accepted_socket, &readSet)
) {
/* We expect data, prev data portion is eaten by CGI
* and there *is* data to read from the peer
* (POSTDATA?) */
count = bodyLen > (int)sizeof(wbuf) ? (int)sizeof(wbuf) : bodyLen;
count = safe_read(accepted_socket, wbuf, count);
if (count > 0) {
post_read_size = count;
post_read_idx = 0;
bodyLen -= count;
} else {
bodyLen = 0; /* closed */
}
}
#define PIPESIZE PIPE_BUF
#if PIPESIZE >= MAX_MEMORY_BUFF
# error "PIPESIZE >= MAX_MEMORY_BUFF"
#endif
if (FD_ISSET(inFd, &readSet)) {
/* There is something to read from CGI */
int s = accepted_socket;
char *rbuf = iobuf;
/* Are we still buffering CGI output? */
if (buf_count >= 0) {
/* According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
* CGI scripts MUST send their own header terminated by
* empty line, then data. That's why we have only one
* <cr><lf> pair here. We will output "200 OK" line
* if needed, but CGI still has to provide blank line
* between header and body */
static const char HTTP_200[] = "HTTP/1.0 200 OK\r\n";
/* Must use safe_read, not full_read, because
* CGI may output a few first bytes and then wait
* for POSTDATA without closing stdout.
* With full_read we may wait here forever. */
count = safe_read(inFd, rbuf + buf_count, PIPESIZE - 8);
if (count <= 0) {
/* eof (or error) and there was no "HTTP",
* so write it, then write received data */
if (buf_count) {
full_write(s, HTTP_200, sizeof(HTTP_200)-1);
full_write(s, rbuf, buf_count);
}
break; /* closed */
}
buf_count += count;
count = 0;
/* "Status" header format is: "Status: 302 Redirected\r\n" */
if (buf_count >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
/* send "HTTP/1.0 " */
if (full_write(s, HTTP_200, 9) != 9)
break;
rbuf += 8; /* skip "Status: " */
count = buf_count - 8;
buf_count = -1; /* buffering off */
} else if (buf_count >= 4) {
/* Did CGI add "HTTP"? */
if (memcmp(rbuf, HTTP_200, 4) != 0) {
/* there is no "HTTP", do it ourself */
if (full_write(s, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
break;
}
/* Commented out:
if (!strstr(rbuf, "ontent-")) {
full_write(s, "Content-type: text/plain\r\n\r\n", 28);
}
* Counter-example of valid CGI without Content-type:
* echo -en "HTTP/1.0 302 Found\r\n"
* echo -en "Location: http://www.busybox.net\r\n"
* echo -en "\r\n"
*/
count = buf_count;
buf_count = -1; /* buffering off */
}
} else {
count = safe_read(inFd, rbuf, PIPESIZE);
if (count <= 0)
break; /* eof (or error) */
}
if (full_write(s, rbuf, count) != count)
break;
if (DEBUG)
fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
} /* if (FD_ISSET(inFd)) */
} /* while (1) */
return 0;
}
#endif /* FEATURE_HTTPD_CGI */
/****************************************************************************
*
> $Function: sendFile()
*
* $Description: Send a file response to a 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"; */
found_mime_type = table[1];
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
if (suffix) {
Htaccess * cur;
for (cur = mime_a; cur; cur = cur->next) {
if (strcmp(cur->before_colon, suffix) == 0) {
found_mime_type = cur->after_colon;
break;
}
}
}
#endif /* FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
if (DEBUG)
fprintf(stderr, "sending file '%s' content-type: %s\n",
url, found_mime_type);
f = open(url, O_RDONLY);
if (f >= 0) {
int count;
char *buf = iobuf;
sendHeaders(HTTP_OK);
/* TODO: sendfile() */
while ((count = full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
int fd = accepted_socket;
if (fd == 0) fd++; /* write to fd# 1 in inetd mode */
if (full_write(fd, buf, count) != count)
break;
}
close(f);
} else {
if (DEBUG)
bb_perror_msg("cannot open '%s'", url);
sendHeaders(HTTP_NOT_FOUND);
}
return 0;
}
static int checkPermIP(void)
{
Htaccess_IP * cur;
/* This could stand some work */
for (cur = ip_a_d; cur; cur = cur->next) {
#if ENABLE_FEATURE_HTTPD_CGI && DEBUG
fprintf(stderr, "checkPermIP: '%s' ? ", rmt_ip_str);
#endif
#if DEBUG
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),
(unsigned char)(cur->ip),
(unsigned char)(cur->mask >> 24),
(unsigned char)(cur->mask >> 16),
(unsigned char)(cur->mask >> 8),
(unsigned char)(cur->mask)
);
#endif
if ((rmt_ip & cur->mask) == cur->ip)
return cur->allow_deny == 'A'; /* Allow/Deny */
}
/* if unconfigured, return 1 - access from all */
return !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.
*
* $Return: (int) . . . . . . . . . 1 if request OK, 0 otherwise.
*
****************************************************************************/
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
static int checkPerm(const char *path, const char *request)
{
Htaccess * cur;
const char *p;
const char *p0;
const char *prev = NULL;
/* This could stand some work */
for (cur = g_auth; cur; cur = cur->next) {
size_t l;
p0 = cur->before_colon;
if (prev != NULL && strcmp(prev, p0) != 0)
continue; /* find next identical */
p = cur->after_colon;
if (DEBUG)
fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
l = strlen(p0);
if (strncmp(p0, path, l) == 0
&& (l == 1 || path[l] == '/' || path[l] == '\0')
) {
char *u;
/* path match found. Check request */
/* for check next /path:user:password */
prev = p0;
u = strchr(request, ':');
if (u == NULL) {
/* bad request, ':' required */
break;
}
if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
char *cipher;
char *pp;
if (strncmp(p, request, u-request) != 0) {
/* user uncompared */
continue;
}
pp = strchr(p, ':');
if (pp && pp[1] == '$' && 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;
}
}
if (strcmp(p, request) == 0) {
set_remoteuser_var:
remoteuser = strdup(request);
if (remoteuser)
remoteuser[(u - request)] = 0;
return 1; /* Ok */
}
/* unauthorized */
}
} /* for */
return prev == NULL;
}
#endif /* FEATURE_HTTPD_BASIC_AUTH */
/****************************************************************************
*
> $Function: handle_sigalrm()
*
* $Description: Handle timeouts
*
****************************************************************************/
static void handle_sigalrm(int sig)
{
sendHeaders(HTTP_REQUEST_TIMEOUT);
alarm_signaled = 1;
}
/****************************************************************************
*
> $Function: handleIncoming()
*
* $Description: Handle an incoming http request.
*
****************************************************************************/
static void handleIncoming(void)
{
char *buf = iobuf;
char *url;
char *purl;
int blank = -1;
char *test;
struct stat sb;
int ip_allowed;
#if ENABLE_FEATURE_HTTPD_CGI
const char *prequest = request_GET;
unsigned long length = 0;
char *cookie = 0;
char *content_type = 0;
#endif
fd_set s_fd;
struct timeval tv;
int retval;
struct sigaction sa;
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
int credentials = -1; /* if not required 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';
#if ENABLE_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) + sizeof("/index.html"));
if (url == NULL) {
sendHeaders(HTTP_INTERNAL_SERVER_ERROR);
break;
}
strcpy(url, buf);
/* extract url args if present */
test = strchr(url, '?');
g_query = NULL;
if (test) {
*test++ = '\0';
g_query = test;
}
test = decodeString(url, 0);
if (test == NULL)
goto BAD_REQUEST;
if (test == url+1) {
/* '/' or NUL is encoded */
sendHeaders(HTTP_NOT_FOUND);
break;
}
/* 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 == '/') {
/* skip duplicate (or initial) slash */
if (*test == '/') {
continue;
}
if (*test == '.') {
/* skip extra '.' */
if (test[1] == '/' || !test[1]) {
continue;
}
/* '..': be careful */
if (test[1] == '.' && (test[2] == '/' || !test[2])) {
++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)) {
found_moved_temporarily = url;
}
}
if (DEBUG)
fprintf(stderr, "url='%s', args=%s\n", url, g_query);
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 = '/';
}
if (blank >= 0) {
/* read until blank line for HTTP version specified, else parse immediate */
while (1) {
alarm(TIMEOUT);
count = getLine();
if (count <= 0)
break;
if (DEBUG)
fprintf(stderr, "header: '%s'\n", buf);
#if ENABLE_FEATURE_HTTPD_CGI
/* try and do our best to parse more lines */
if ((STRNCASECMP(buf, "Content-length:") == 0)) {
/* extra read only for POST */
if (prequest != request_GET) {
test = buf + sizeof("Content-length:")-1;
if (!test[0])
goto bail_out;
errno = 0;
/* not using strtoul: it ignores leading munis! */
length = strtol(test, &test, 10);
/* length is "ulong", but we need to pass it to int later */
/* so we check for negative or too large values in one go: */
/* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
if (test[0] || errno || length > INT_MAX)
goto bail_out;
}
} else if (STRNCASECMP(buf, "Cookie:") == 0) {
cookie = strdup(skip_whitespace(buf + sizeof("Cookie:")-1));
} else if (STRNCASECMP(buf, "Content-Type:") == 0) {
content_type = strdup(skip_whitespace(buf + sizeof("Content-Type:")-1));
} else if (STRNCASECMP(buf, "Referer:") == 0) {
referer = strdup(skip_whitespace(buf + sizeof("Referer:")-1));
} else if (STRNCASECMP(buf, "User-Agent:") == 0) {
user_agent = strdup(skip_whitespace(buf + sizeof("User-Agent:")-1));
}
#endif
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
if (STRNCASECMP(buf, "Authorization:") == 0) {
/* We only allow Basic credentials.
* It shows up as "Authorization: Basic <userid:password>" where
* the userid:password is base64 encoded.
*/
test = skip_whitespace(buf + sizeof("Authorization:")-1);
if (STRNCASECMP(test, "Basic") != 0)
continue;
test += sizeof("Basic")-1;
/* decodeBase64() skips whitespace itself */
decodeBase64(test);
credentials = checkPerm(url, test);
}
#endif /* FEATURE_HTTPD_BASIC_AUTH */
} /* while extra header reading */
}
alarm(0);
if (alarm_signaled)
break;
if (strcmp(bb_basename(url), httpd_conf) == 0 || ip_allowed == 0) {
/* protect listing [/path]/httpd_conf or IP deny */
#if ENABLE_FEATURE_HTTPD_CGI
FORBIDDEN: /* protect listing /cgi-bin */
#endif
sendHeaders(HTTP_FORBIDDEN);
break;
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
if (credentials <= 0 && checkPerm(url, ":") == 0) {
sendHeaders(HTTP_UNAUTHORIZED);
break;
}
#endif
if (found_moved_temporarily) {
sendHeaders(HTTP_MOVED_TEMPORARILY);
/* clear unforked memory flag */
found_moved_temporarily = NULL;
break;
}
test = url + 1; /* skip first '/' */
#if ENABLE_FEATURE_HTTPD_CGI
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);
break;
}
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
{
char *suffix = strrchr(test, '.');
if (suffix) {
Htaccess *cur;
for (cur = script_i; cur; cur = cur->next) {
if (strcmp(cur->before_colon + 1, suffix) == 0) {
sendCgi(url, prequest, length, cookie, content_type);
goto bail_out;
}
}
}
}
#endif
if (prequest != request_GET) {
sendHeaders(HTTP_NOT_IMPLEMENTED);
break;
}
#endif /* FEATURE_HTTPD_CGI */
if (purl[-1] == '/')
strcpy(purl, "index.html");
if (stat(test, &sb) == 0) {
/* It's a dir URL and there is index.html */
ContentLength = sb.st_size;
last_mod = sb.st_mtime;
}
#if ENABLE_FEATURE_HTTPD_CGI
else if (purl[-1] == '/') {
/* It's a dir URL and there is no index.html
* Try cgi-bin/index.cgi */
if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
purl[0] = '\0';
g_query = url;
sendCgi("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
break;
}
}
#endif /* FEATURE_HTTPD_CGI */
sendFile(test);
ContentLength = -1;
} while (0);
#if ENABLE_FEATURE_HTTPD_CGI
bail_out:
#endif
if (DEBUG)
fprintf(stderr, "closing socket\n\n");
#if ENABLE_FEATURE_HTTPD_CGI
free(cookie);
free(content_type);
free(referer);
referer = NULL;
# if ENABLE_FEATURE_HTTPD_BASIC_AUTH
free(remoteuser);
remoteuser = NULL;
# endif
#endif
shutdown(accepted_socket, SHUT_WR);
/* Properly wait for remote to closed */
FD_ZERO(&s_fd);
FD_SET(accepted_socket, &s_fd);
do {
tv.tv_sec = 2;
tv.tv_usec = 0;
retval = select(accepted_socket + 1, &s_fd, NULL, NULL, &tv);
} while (retval > 0 && read(accepted_socket, buf, sizeof(iobuf) > 0));
shutdown(accepted_socket, SHUT_RD);
/* In inetd case, we close fd 1 (stdout) here. We will exit soon anyway */
close(accepted_socket);
}
#if BB_MMU
/****************************************************************************
*
> $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.
*
****************************************************************************/
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) {
int s;
union {
struct sockaddr sa;
struct sockaddr_in sin;
USE_FEATURE_IPV6(struct sockaddr_in6 sin6;)
} fromAddr;
socklen_t fromAddrLen = sizeof(fromAddr);
/* Now wait INDEFINITELY on the set of sockets! */
readfd = portfd;
if (select(server + 1, &readfd, 0, 0, 0) <= 0)
continue;
if (!FD_ISSET(server, &readfd))
continue;
s = accept(server, &fromAddr.sa, &fromAddrLen);
if (s < 0)
continue;
accepted_socket = s;
rmt_ip = 0;
tcp_port = 0;
#if ENABLE_FEATURE_HTTPD_CGI || DEBUG
free(rmt_ip_str);
rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddrLen);
#if DEBUG
bb_error_msg("connection from '%s'", rmt_ip_str);
#endif
#endif /* FEATURE_HTTPD_CGI */
if (fromAddr.sa.sa_family == AF_INET) {
rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
tcp_port = ntohs(fromAddr.sin.sin_port);
}
#if ENABLE_FEATURE_IPV6
if (fromAddr.sa.sa_family == AF_INET6) {
//rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
tcp_port = ntohs(fromAddr.sin6.sin6_port);
}
#endif
/* set the KEEPALIVE option to cull dead connections */
setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
if (DEBUG || fork() == 0) {
/* child */
#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
/* protect reload config, may be confuse checking */
signal(SIGHUP, SIG_IGN);
#endif
handleIncoming();
if (!DEBUG)
exit(0);
}
close(s);
} /* while (1) */
return 0;
}
#endif
/* from inetd */
static int miniHttpd_inetd(void)
{
union {
struct sockaddr sa;
struct sockaddr_in sin;
USE_FEATURE_IPV6(struct sockaddr_in6 sin6;)
} fromAddr;
socklen_t fromAddrLen = sizeof(fromAddr);
getpeername(0, &fromAddr.sa, &fromAddrLen);
rmt_ip = 0;
tcp_port = 0;
#if ENABLE_FEATURE_HTTPD_CGI || DEBUG
free(rmt_ip_str);
rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddrLen);
#endif
if (fromAddr.sa.sa_family == AF_INET) {
rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
tcp_port = ntohs(fromAddr.sin.sin_port);
}
#if ENABLE_FEATURE_IPV6
if (fromAddr.sa.sa_family == AF_INET6) {
//rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
tcp_port = ntohs(fromAddr.sin6.sin6_port);
}
#endif
handleIncoming();
return 0;
}
#if ENABLE_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
enum {
c_opt_config_file = 0,
d_opt_decode_url,
h_opt_home_httpd,
USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
USE_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
USE_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
USE_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
p_opt_port ,
p_opt_inetd ,
p_opt_foreground,
OPT_CONFIG_FILE = 1 << c_opt_config_file,
OPT_DECODE_URL = 1 << d_opt_decode_url,
OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
OPT_ENCODE_URL = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
OPT_REALM = USE_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
OPT_MD5 = USE_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
OPT_SETUID = USE_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
OPT_PORT = 1 << p_opt_port,
OPT_INETD = 1 << p_opt_inetd,
OPT_FOREGROUND = 1 << p_opt_foreground,
};
int httpd_main(int argc, char **argv);
int httpd_main(int argc, char **argv)
{
unsigned opt;
char *url_for_decode;
USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
const char *s_port;
USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
#if ENABLE_LOCALE_SUPPORT
/* Undo busybox.c: we want to speak English in http (dates etc) */
setlocale(LC_TIME, "C");
#endif
INIT_G();
home_httpd = xrealloc_getcwd_or_warn(NULL);
/* We do not "absolutize" path given by -h (home) opt.
* If user gives relative path in -h, $SCRIPT_FILENAME can end up
* relative too. */
opt = getopt32(argc, argv, "c:d:h:"
USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
USE_FEATURE_HTTPD_BASIC_AUTH("r:")
USE_FEATURE_HTTPD_AUTH_MD5("m:")
USE_FEATURE_HTTPD_SETUID("u:")
"p:if",
&(configFile), &url_for_decode, &home_httpd
USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
USE_FEATURE_HTTPD_SETUID(, &s_ugid)
, &s_port
);
if (opt & OPT_DECODE_URL) {
printf("%s", decodeString(url_for_decode, 1));
return 0;
}
#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
if (opt & OPT_ENCODE_URL) {
printf("%s", encodeString(url_for_encode));
return 0;
}
#endif
#if ENABLE_FEATURE_HTTPD_AUTH_MD5
if (opt & OPT_MD5) {
puts(pw_encrypt(pass, "$1$"));
return 0;
}
#endif
if (opt & OPT_PORT)
tcp_port = xatou16(s_port);
#if ENABLE_FEATURE_HTTPD_SETUID
if (opt & OPT_SETUID) {
if (!get_uidgid(&ugid, s_ugid, 1))
bb_error_msg_and_die("unrecognized user[:group] "
"name '%s'", s_ugid);
}
#endif
xchdir(home_httpd);
if (!(opt & OPT_INETD)) {
#if BB_MMU
signal(SIGCHLD, SIG_IGN);
server_socket = openServer();
#if ENABLE_FEATURE_HTTPD_SETUID
/* drop privileges */
if (opt & OPT_SETUID) {
if (ugid.gid != (gid_t)-1) {
if (setgroups(1, &ugid.gid) == -1)
bb_perror_msg_and_die("setgroups");
xsetgid(ugid.gid);
}
xsetuid(ugid.uid);
}
#endif
#else /* BB_MMU */
bb_error_msg_and_die("-i is required");
#endif
}
#if ENABLE_FEATURE_HTTPD_CGI
{
char *p = getenv("PATH");
/* env strings themself are not freed, no need to strdup(p): */
clearenv();
if (p)
putenv(p - 5);
if (!(opt & OPT_INETD))
setenv_long("SERVER_PORT", tcp_port);
}
#endif
#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
sighup_handler(0);
#else
parse_conf(default_path_httpd_conf, FIRST_PARSE);
#endif
if (opt & OPT_INETD)
return miniHttpd_inetd();
#if BB_MMU
if (!(opt & OPT_FOREGROUND))
bb_daemonize(0); /* don't change current directory */
return miniHttpd(server_socket);
#else
return 0; /* not reached */
#endif
}
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