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busybox/networking/httpd.c
Denis Vlasenko 53091ecd20 Attempt to get more applets compile for NOMMU. 
TODO_config_nommu documents what I managed to compile so far
(yay! msh works! cool). inetd, telnetd, httpd still do not compile. TODO
Also make fork(), daemon() produce warnings on compile stage
(in addition to erros on link stage).
2007-03-26 13:35:09 +00:00

2048 lines
55 KiB
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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 "busybox.h"
/* amount of buffering in a pipe */
#ifndef PIPE_BUF
# define PIPE_BUF 4096
#endif
static const char httpdVersion[] = "busybox httpd/1.35 6-Oct-2004";
static const char default_path_httpd_conf[] = "/etc";
static const char httpd_conf[] = "httpd.conf";
static const char home[] = "./";
#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 int ip;
unsigned int mask;
int allow_deny;
struct HT_ACCESS_IP *next;
} Htaccess_IP;
typedef struct {
char buf[MAX_MEMORY_BUFF];
USE_FEATURE_HTTPD_BASIC_AUTH(const char *realm;)
USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
const char *query;
USE_FEATURE_HTTPD_CGI(char *referer;)
const char *configFile;
unsigned int rmt_ip;
#if ENABLE_FEATURE_HTTPD_CGI || DEBUG
char *rmt_ip_str; /* for set env REMOTE_ADDR */
#endif
unsigned port; /* server initial port and for
set env REMOTE_PORT */
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 */
int flg_deny_all;
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
Htaccess *auth; /* config user:password lines */
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
Htaccess *mime_a; /* config mime types */
#endif
int server_socket;
int accepted_socket;
volatile int alarm_signaled;
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
Htaccess *script_i; /* config script interpreters */
#endif
} HttpdConfig;
static HttpdConfig *config;
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 int *ip, unsigned char endc)
{
const char *p = *ep;
int auto_mask = 8;
int j;
*ip = 0;
for (j = 0; j < 4; j++) {
unsigned int octet;
if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0)
return -auto_mask;
octet = 0;
while (*p >= '0' && *p <= '9') {
octet *= 10;
octet += *p - '0';
if (octet > 255)
return -auto_mask;
p++;
}
if (*p == '.')
p++;
if (*p != '/' && *p != 0)
auto_mask += 8;
*ip = ((*ip) << 8) | octet;
}
if (*p != 0) {
if (*p != endc)
return -auto_mask;
p++;
if (*p == 0)
return -auto_mask;
}
*ep = p;
return auto_mask;
}
static int scan_ip_mask(const char *ipm, unsigned int *ip, unsigned int *mask)
{
int i;
unsigned int msk;
i = scan_ip(&ipm, ip, '/');
if (i < 0)
return i;
if (*ipm) {
const char *p = ipm;
i = 0;
while (*p) {
if (*p < '0' || *p > '9') {
if (*p == '.') {
i = scan_ip(&ipm, mask, 0);
return i != 32;
}
return -1;
}
i *= 10;
i += *p - '0';
p++;
}
}
if (i > 32 || i < 0)
return -1;
msk = 0x80000000;
*mask = 0;
while (i > 0) {
*mask |= msk;
msk >>= 1;
i--;
}
return 0;
}
#if 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 = config->configFile;
char buf[160];
char *p0 = NULL;
char *c, *p;
/* free previous ip setup if present */
Htaccess_IP *pip = config->ip_a_d;
while (pip) {
Htaccess_IP *cur_ipl = pip;
pip = cur_ipl->next;
free(cur_ipl);
}
config->ip_a_d = NULL;
config->flg_deny_all = 0;
#if 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(&config->auth);
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
free_config_lines(&config->mime_a);
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
free_config_lines(&config->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 (config->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 = config->auth;
#endif
/* This could stand some work */
while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
c = NULL;
for (p = p0; *p0 != 0 && *p0 != '#'; p0++) {
if (!isspace(*p0)) {
*p++ = *p0;
if (*p0 == ':' && c == NULL)
c = p;
}
}
*p = 0;
/* test for empty or strange line */
if (c == NULL || *c == 0)
continue;
p0 = buf;
if (*p0 == 'd')
*p0 = 'D';
if (*c == '*') {
if (*p0 == 'D') {
/* memorize deny all */
config->flg_deny_all++;
}
/* skip default other "word:*" config lines */
continue;
}
if (*p0 == 'a')
*p0 = 'A';
else if (*p0 != 'D' && *p0 != 'A'
#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 = config->ip_a_d;
config->ip_a_d = pip;
} else {
/* add to bottom A:form_IP config line */
Htaccess_IP *prev_IP = config->ip_a_d;
if (prev_IP == NULL) {
config->ip_a_d = pip;
} else {
while (prev_IP->next)
prev_IP = prev_IP->next;
prev_IP->next = pip;
}
}
}
continue;
}
#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 = config->mime_a;
config->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 = config->script_i;
config->script_i = cur;
continue;
}
#endif
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
free(p0);
if (prev == NULL) {
/* first line */
config->auth = prev = cur;
} else {
/* sort path, if current lenght eq or bigger then move up */
Htaccess *prev_hti = config->auth;
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 */
config->auth = cur;
}
break;
}
if (prev_hti != hti)
prev_hti = prev_hti->next;
}
if (!hti) { /* not inserted, add to bottom */
prev->next = cur;
prev = cur;
}
}
#endif
}
#endif
}
fclose(f);
}
#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 long ch = 0;
int i = 0;
while (*in) {
int t = *in++;
if (t >= '0' && t <= '9')
t = t - '0' + 52;
else if (t >= 'A' && t <= 'Z')
t = t - 'A';
else if (t >= 'a' && t <= 'z')
t = t - 'a' + 26;
else if (t == '+')
t = 62;
else if (t == '/')
t = 63;
else if (t == '=')
t = 0;
else
continue;
ch = (ch << 6) | t;
i++;
if (i == 4) {
*Data++ = (char) (ch >> 16);
*Data++ = (char) (ch >> 8);
*Data++ = (char) ch;
i = 0;
}
}
*Data = 0;
}
#endif
/****************************************************************************
*
> $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)
{
int fd;
/* create the socket right now */
fd = create_and_bind_stream_or_die(NULL, config->port);
xlisten(fd, 9);
return fd;
}
/****************************************************************************
*
> $Function: sendHeaders()
*
* $Description: Create and send HTTP response headers.
* The arguments are combined and sent as one write operation. Note that
* IE will puke big-time if the headers are not sent in one packet and the
* second packet is delayed for any reason.
*
* $Parameter:
* (HttpResponseNum) responseNum . . . The result code to send.
*
* $Return: (int) . . . . writing errors
*
****************************************************************************/
static int sendHeaders(HttpResponseNum responseNum)
{
char *buf = config->buf;
const char *responseString = "";
const char *infoString = 0;
const char *mime_type;
unsigned i;
time_t timer = time(0);
char timeStr[80];
int len;
enum {
numNames = sizeof(httpResponseNames) / sizeof(httpResponseNames[0])
};
for (i = 0; i < numNames; i++) {
if (httpResponseNames[i].type == responseNum) {
responseString = httpResponseNames[i].name;
infoString = httpResponseNames[i].info;
break;
}
}
/* error message is HTML */
mime_type = responseNum == HTTP_OK ?
config->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",
config->realm);
}
#endif
if (responseNum == HTTP_MOVED_TEMPORARILY) {
len += sprintf(buf+len, "Location: %s/%s%s\r\n",
config->found_moved_temporarily,
(config->query ? "?" : ""),
(config->query ? config->query : ""));
}
if (config->ContentLength != -1) { /* file */
strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod));
len += sprintf(buf+len, "Last-Modified: %s\r\n%s %"OFF_FMT"d\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);
}
if (DEBUG)
fprintf(stderr, "headers: '%s'\n", buf);
i = config->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 = config->buf;
while (read(config->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)
{
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 buf_count;
int status;
size_t post_read_size, post_read_idx;
if (pipe(fromCgi) != 0)
return 0;
if (pipe(toCgi) != 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).
*/
#ifdef BB_NOMMU
pid = vfork();
#else
pid = fork();
#endif
if (pid < 0)
return 0;
if (!pid) {
/* child process */
char *script;
char *purl;
char realpath_buff[MAXPATHLEN];
if (config->accepted_socket > 1)
close(config->accepted_socket);
if (config->server_socket > 1)
close(config->server_socket);
dup2(toCgi[0], 0); // replace stdin with the pipe
dup2(fromCgi[1], 1); // replace stdout with the pipe
/* Huh? User seeing stderr can be a security problem...
* and if CGI really wants that, it can always dup2(1,2)...
if (!DEBUG)
dup2(fromCgi[1], 2); // replace stderr with the pipe
*/
/* I think we cannot inadvertently close 0, 1 here... */
close(toCgi[0]);
close(toCgi[1]);
close(fromCgi[0]);
close(fromCgi[1]);
/*
* 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("PATH", getenv("PATH")); redundant */
setenv1("REQUEST_METHOD", request);
if (config->query) {
char *uri = alloca(strlen(purl) + 2 + strlen(config->query));
if (uri)
sprintf(uri, "%s?%s", purl, config->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 */
if (!realpath(purl + 1, realpath_buff))
goto error_execing_cgi;
setenv1("SCRIPT_FILENAME", realpath_buff);
/* 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", config->query);
setenv1("SERVER_SOFTWARE", httpdVersion);
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 = config->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 ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
setenv_long("REMOTE_PORT", config->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 (config->remoteuser) {
setenv1("REMOTE_USER", config->remoteuser);
putenv((char*)"AUTH_TYPE=Basic");
}
#endif
if (config->referer)
setenv1("HTTP_REFERER", config->referer);
/* set execve argp[0] without path */
argp[0] = strrchr(purl, '/') + 1;
/* but script argp[0] must have absolute path and chdiring to this */
script = strrchr(realpath_buff, '/');
if (!script)
goto error_execing_cgi;
*script = '\0';
if (chdir(realpath_buff) == 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 = config->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(realpath_buff, argp);
}
error_execing_cgi:
/* send to stdout (even if we are not from inetd) */
config->accepted_socket = 1;
sendHeaders(HTTP_NOT_FOUND);
_exit(242);
} /* end child */
/* parent process */
buf_count = 0;
post_read_size = 0;
post_read_idx = 0; /* for gcc */
inFd = fromCgi[0];
outFd = toCgi[1];
close(fromCgi[1]);
close(toCgi[0]);
signal(SIGPIPE, SIG_IGN);
while (1) {
fd_set readSet;
fd_set writeSet;
char wbuf[128];
int nfound;
int count;
FD_ZERO(&readSet);
FD_ZERO(&writeSet);
FD_SET(inFd, &readSet);
if (bodyLen > 0 || post_read_size > 0) {
FD_SET(outFd, &writeSet);
nfound = outFd > inFd ? outFd : inFd;
if (post_read_size == 0) {
FD_SET(config->accepted_socket, &readSet);
if (nfound < config->accepted_socket)
nfound = config->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(config->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(config->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 = config->accepted_socket;
char *rbuf = config->buf;
/* Are we still buffering CGI output? */
if (buf_count >= 0) {
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 - 4);
if (count <= 0) {
/* eof (or error) and there was no "HTTP",
* so add one and write out the 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;
if (buf_count >= 4) {
/* check to see if CGI added "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;
}
/* 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"
if (!strstr(rbuf, "ontent-")) {
full_write(s, "Content-type: text/plain\r\n\r\n", 28);
}
*/
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"; */
config->found_mime_type = table[1];
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
if (suffix) {
Htaccess * cur;
for (cur = config->mime_a; cur; cur = cur->next) {
if (strcmp(cur->before_colon, suffix) == 0) {
config->found_mime_type = cur->after_colon;
break;
}
}
}
#endif /* FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
if (DEBUG)
fprintf(stderr, "sending file '%s' content-type: %s\n",
url, config->found_mime_type);
f = open(url, O_RDONLY);
if (f >= 0) {
int count;
char *buf = config->buf;
sendHeaders(HTTP_OK);
/* TODO: sendfile() */
while ((count = full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
int fd = config->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 = config->ip_a_d; cur; cur = cur->next) {
#if ENABLE_FEATURE_HTTPD_CGI && DEBUG
fprintf(stderr, "checkPermIP: '%s' ? ", config->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 ((config->rmt_ip & cur->mask) == cur->ip)
return cur->allow_deny == 'A'; /* Allow/Deny */
}
/* if unconfigured, return 1 - access from all */
return !config->flg_deny_all;
}
/****************************************************************************
*
> $Function: checkPerm()
*
* $Description: Check the permission file for access password protected.
*
* If config file isn't present, everything is allowed.
* Entries are of the form you can see example from header source
*
* $Parameters:
* (const char *) path . . . . The file path.
* (const char *) request . . . User information to validate.
*
* $Return: (int) . . . . . . . . . 1 if request OK, 0 otherwise.
*
****************************************************************************/
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
static int checkPerm(const char *path, const char *request)
{
Htaccess * cur;
const char *p;
const char *p0;
const char *prev = NULL;
/* This could stand some work */
for (cur = config->auth; cur; cur = cur->next) {
size_t l;
p0 = cur->before_colon;
if (prev != NULL && strcmp(prev, p0) != 0)
continue; /* find next identical */
p = cur->after_colon;
if (DEBUG)
fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
l = strlen(p0);
if (strncmp(p0, path, l) == 0
&& (l == 1 || path[l] == '/' || path[l] == '\0')
) {
char *u;
/* path match found. Check request */
/* for check next /path:user:password */
prev = p0;
u = strchr(request, ':');
if (u == NULL) {
/* bad request, ':' required */
break;
}
if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
char *cipher;
char *pp;
if (strncmp(p, request, u-request) != 0) {
/* user uncompared */
continue;
}
pp = strchr(p, ':');
if (pp && pp[1] == '$' && 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:
config->remoteuser = strdup(request);
if (config->remoteuser)
config->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);
config->alarm_signaled = sig;
}
/****************************************************************************
*
> $Function: handleIncoming()
*
* $Description: Handle an incoming http request.
*
****************************************************************************/
static void handleIncoming(void)
{
char *buf = config->buf;
char *url;
char *purl;
int blank = -1;
char *test;
struct stat sb;
int ip_allowed;
#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, '?');
config->query = NULL;
if (test) {
*test++ = '\0';
config->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] == 0) {
continue;
} else
/* '..': be careful */
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)) {
config->found_moved_temporarily = url;
}
}
if (DEBUG)
fprintf(stderr, "url='%s', args=%s\n", url, config->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)) {
config->referer = strdup(skip_whitespace(buf + sizeof("Referer:")-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 (config->alarm_signaled)
break;
if (strcmp(strrchr(url, '/') + 1, 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 (config->found_moved_temporarily) {
sendHeaders(HTTP_MOVED_TEMPORARILY);
/* clear unforked memory flag */
config->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 = config->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 */
config->ContentLength = sb.st_size;
config->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';
config->query = url;
sendCgi("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
break;
}
}
#endif /* FEATURE_HTTPD_CGI */
sendFile(test);
config->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(config->referer);
config->referer = NULL;
# if ENABLE_FEATURE_HTTPD_BASIC_AUTH
free(config->remoteuser);
config->remoteuser = NULL;
# endif
#endif
shutdown(config->accepted_socket, SHUT_WR);
/* Properly wait for remote to closed */
FD_ZERO(&s_fd);
FD_SET(config->accepted_socket, &s_fd);
do {
tv.tv_sec = 2;
tv.tv_usec = 0;
retval = select(config->accepted_socket + 1, &s_fd, NULL, NULL, &tv);
} while (retval > 0 && read(config->accepted_socket, buf, sizeof(config->buf) > 0));
shutdown(config->accepted_socket, SHUT_RD);
/* In inetd case, we close fd 1 (stdout) here. We will exit soon anyway */
close(config->accepted_socket);
}
/****************************************************************************
*
> $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;
config->accepted_socket = s;
config->rmt_ip = 0;
config->port = 0;
#if ENABLE_FEATURE_HTTPD_CGI || DEBUG
free(config->rmt_ip_str);
config->rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddrLen);
#if DEBUG
bb_error_msg("connection from '%s'", config->rmt_ip_str);
#endif
#endif /* FEATURE_HTTPD_CGI */
if (fromAddr.sa.sa_family == AF_INET) {
config->rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
config->port = ntohs(fromAddr.sin.sin_port);
}
#if ENABLE_FEATURE_IPV6
if (fromAddr.sa.sa_family == AF_INET6) {
//config->rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
config->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;
}
/* 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);
config->rmt_ip = 0;
config->port = 0;
#if ENABLE_FEATURE_HTTPD_CGI || DEBUG
free(config->rmt_ip_str);
config->rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddrLen);
#endif
if (fromAddr.sa.sa_family == AF_INET) {
config->rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
config->port = ntohs(fromAddr.sin.sin_port);
}
#if ENABLE_FEATURE_IPV6
if (fromAddr.sa.sa_family == AF_INET6) {
//config->rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
config->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;
const char *home_httpd = home;
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
config = xzalloc(sizeof(*config));
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
config->realm = "Web Server Authentication";
#endif
config->port = 80;
config->ContentLength = -1;
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",
&(config->configFile), &url_for_decode, &home_httpd
USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
USE_FEATURE_HTTPD_BASIC_AUTH(, &(config->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)
config->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)) {
signal(SIGCHLD, SIG_IGN);
config->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
}
#if ENABLE_FEATURE_HTTPD_CGI
{
char *p = getenv("PATH");
p = xstrdup(p); /* if gets NULL, returns NULL */
clearenv();
if (p)
setenv1("PATH", p);
if (!(opt & OPT_INETD))
setenv_long("SERVER_PORT", config->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 (!(opt & OPT_FOREGROUND))
bb_daemonize(0); /* don't change current directory */
return miniHttpd(config->server_socket);
}
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