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1acdc89e99
busybox/networking/httpd.c
Denis Vlasenko 5d61e71c3a introduce safe_poll (fixes a problem in top) 
function                                             old     new   delta
safe_poll                                              -      77     +77
svlogd_main                                         1470    1466      -4
zcip_main                                           1530    1524      -6
forkexec                                            1345    1338      -7
decode_format_string                                 795     788      -7
collect_blk                                          474     467      -7
buffer_pread                                         540     532      -8
tftp                                                1182    1172     -10
microcom_main                                        763     749     -14
arpping                                              441     424     -17
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/9 up/down: 77/-80)             Total: -3 bytes
   text    data     bss     dec     hex filename
 770162    1034   10404  781600   bed20 busybox_old
 770158    1034   10404  781596   bed1c busybox_unstripped
2007-09-27 10:09:59 +00:00

2234 lines
60 KiB
C
Raw Blame History

/* 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 starts by "/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
* E404:/path/e404.html # /path/e404.html is the 404 (not found) error page
* /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.
*
* Custom error pages can contain an absolute path or be relative to
* 'home_httpd'. Error pages are to be static files (no CGI or script). Error
* page can only be defined in the root configuration file and are not taken
* into account in local (directories) config files.
*
* 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"
#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
#include <sys/sendfile.h>
#endif
//#define DEBUG 1
#define DEBUG 0
#define IOBUF_SIZE 8192 /* IO buffer */
/* amount of buffering in a pipe */
#ifndef PIPE_BUF
# define PIPE_BUF 4096
#endif
#if PIPE_BUF >= IOBUF_SIZE
# error "PIPE_BUF >= IOBUF_SIZE"
#endif
#define HEADER_READ_TIMEOUT 60
static const char default_path_httpd_conf[] ALIGN1 = "/etc";
static const char httpd_conf[] ALIGN1 = "httpd.conf";
static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
typedef struct has_next_ptr {
struct has_next_ptr *next;
} has_next_ptr;
/* Must have "next" as a first member */
typedef struct Htaccess {
struct Htaccess *next;
char *after_colon;
char before_colon[1]; /* really bigger, must be last */
} Htaccess;
/* Must have "next" as a first member */
typedef struct Htaccess_IP {
struct Htaccess_IP *next;
unsigned ip;
unsigned mask;
int allow_deny;
} Htaccess_IP;
enum {
HTTP_OK = 200,
HTTP_PARTIAL_CONTENT = 206,
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,
HTTP_CONTINUE = 100,
#if 0 /* future use */
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
};
static const uint16_t http_response_type[] ALIGN2 = {
HTTP_OK,
#if ENABLE_FEATURE_HTTPD_RANGES
HTTP_PARTIAL_CONTENT,
#endif
HTTP_MOVED_TEMPORARILY,
HTTP_REQUEST_TIMEOUT,
HTTP_NOT_IMPLEMENTED,
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
HTTP_UNAUTHORIZED,
#endif
HTTP_NOT_FOUND,
HTTP_BAD_REQUEST,
HTTP_FORBIDDEN,
HTTP_INTERNAL_SERVER_ERROR,
#if 0 /* not implemented */
HTTP_CREATED,
HTTP_ACCEPTED,
HTTP_NO_CONTENT,
HTTP_MULTIPLE_CHOICES,
HTTP_MOVED_PERMANENTLY,
HTTP_NOT_MODIFIED,
HTTP_BAD_GATEWAY,
HTTP_SERVICE_UNAVAILABLE,
#endif
};
static const struct {
const char *name;
const char *info;
} http_response[ARRAY_SIZE(http_response_type)] = {
{ "OK", NULL },
#if ENABLE_FEATURE_HTTPD_RANGES
{ "Partial Content", NULL },
#endif
{ "Found", NULL },
{ "Request Timeout", "No request appeared within 60 seconds" },
{ "Not Implemented", "The requested method is not recognized" },
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
{ "Unauthorized", "" },
#endif
{ "Not Found", "The requested URL was not found" },
{ "Bad Request", "Unsupported method" },
{ "Forbidden", "" },
{ "Internal Server Error", "Internal Server Error" },
#if 0 /* not implemented */
{ "Created" },
{ "Accepted" },
{ "No Content" },
{ "Multiple Choices" },
{ "Moved Permanently" },
{ "Not Modified" },
{ "Bad Gateway", "" },
{ "Service Unavailable", "" },
#endif
};
struct globals {
int verbose; /* must be int (used by getopt32) */
smallint flg_deny_all;
unsigned rmt_ip; /* used for IP-based allow/deny rules */
time_t last_mod;
char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
const char *bind_addr_or_port;
const char *g_query;
const char *configFile;
const char *home_httpd;
const char *found_mime_type;
const char *found_moved_temporarily;
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;)
off_t file_size; /* -1 - unknown */
#if ENABLE_FEATURE_HTTPD_RANGES
off_t range_start;
off_t range_end;
off_t range_len;
#endif
#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; /* [IOBUF_SIZE] */
#define hdr_buf bb_common_bufsiz1
char *hdr_ptr;
int hdr_cnt;
#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
const char *http_error_page[ARRAY_SIZE(http_response_type)];
#endif
};
#define G (*ptr_to_globals)
#define verbose (G.verbose )
#define flg_deny_all (G.flg_deny_all )
#define rmt_ip (G.rmt_ip )
#define bind_addr_or_port (G.bind_addr_or_port)
#define g_query (G.g_query )
#define configFile (G.configFile )
#define home_httpd (G.home_httpd )
#define found_mime_type (G.found_mime_type )
#define found_moved_temporarily (G.found_moved_temporarily)
#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 )
#define file_size (G.file_size )
#if ENABLE_FEATURE_HTTPD_RANGES
#define range_start (G.range_start )
#define range_end (G.range_end )
#define range_len (G.range_len )
#endif
#define rmt_ip_str (G.rmt_ip_str )
#define g_auth (G.g_auth )
#define mime_a (G.mime_a )
#define script_i (G.script_i )
#define iobuf (G.iobuf )
#define hdr_ptr (G.hdr_ptr )
#define hdr_cnt (G.hdr_cnt )
#define http_error_page (G.http_error_page )
#define INIT_G() do { \
PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
bind_addr_or_port = "80"; \
file_size = -1; \
} while (0)
#if !ENABLE_FEATURE_HTTPD_RANGES
enum {
range_start = 0,
range_end = MAXINT(off_t) - 1,
range_len = MAXINT(off_t),
};
#endif
#define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
/* Prototypes */
static void send_file_and_exit(const char *url, int headers) ATTRIBUTE_NORETURN;
static void free_llist(has_next_ptr **pptr)
{
has_next_ptr *cur = *pptr;
while (cur) {
has_next_ptr *t = cur;
cur = cur->next;
free(t);
}
*pptr = NULL;
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
{
free_llist((has_next_ptr**)pptr);
}
#endif
static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
{
free_llist((has_next_ptr**)pptr);
}
/* Returns presumed mask width in bits or < 0 on error.
* Updates strp, stores IP at provided pointer */
static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
{
const char *p = *strp;
int auto_mask = 8;
unsigned ip = 0;
int j;
if (*p == '/')
return -auto_mask;
for (j = 0; j < 4; j++) {
unsigned octet;
if ((*p < '0' || *p > '9') && *p != '/' && *p)
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)
auto_mask += 8;
ip = (ip << 8) | octet;
}
if (*p) {
if (*p != endc)
return -auto_mask;
p++;
if (*p == '\0')
return -auto_mask;
}
*ipp = ip;
*strp = p;
return auto_mask;
}
/* Returns 0 on success. Stores IP and mask at provided pointers */
static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
{
int i;
unsigned mask;
char *p;
i = scan_ip(&str, ipp, '/');
if (i < 0)
return i;
if (*str) {
/* there is /xxx after dotted-IP address */
i = bb_strtou(str, &p, 10);
if (*p == '.') {
/* 'xxx' itself is dotted-IP mask, parse it */
/* (return 0 (success) only if it has N.N.N.N form) */
return scan_ip(&str, maskp, '\0') - 32;
}
if (*p)
return -1;
}
if (i > 32)
return -1;
if (sizeof(unsigned) == 4 && i == 32) {
/* mask >>= 32 below may not work */
mask = 0;
} else {
mask = 0xffffffff;
mask >>= i;
}
/* i == 0 -> *maskp = 0x00000000
* i == 1 -> *maskp = 0x80000000
* i == 4 -> *maskp = 0xf0000000
* i == 31 -> *maskp = 0xfffffffe
* i == 32 -> *maskp = 0xffffffff */
*maskp = (uint32_t)(~mask);
return 0;
}
/*
* 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
* Ennn:error.html # error page for status nnn
*
* 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.
* Error pages are only parsed on the main config file.
*
* path Path where to look for httpd.conf (without filename).
* flag Type of the parse request.
*/
/* flag */
#define FIRST_PARSE 0
#define SUBDIR_PARSE 1
#define SIGNALED_PARSE 2
#define FIND_FROM_HTTPD_ROOT 3
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;
Htaccess_IP *pip;
/* discard old rules */
free_Htaccess_IP_list(&ip_a_d);
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_Htaccess_list(&g_auth);
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
free_Htaccess_list(&mime_a);
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
free_Htaccess_list(&script_i);
#endif
}
#endif
if (flag == SUBDIR_PARSE || cf == NULL) {
cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
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';
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:from_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_ERROR_PAGES
if (flag == FIRST_PARSE && *p0 == 'E') {
int i;
/* error status code */
int status = atoi(++p0);
/* c already points at the character following ':' in parse loop */
/* c = strchr(p0, ':'); c++; */
if (status < HTTP_CONTINUE) {
bb_error_msg("config error '%s' in '%s'", buf, cf);
continue;
}
/* then error page; find matching status */
for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
if (http_response_type[i] == status) {
http_error_page[i] = concat_path_file((*c == '/') ? NULL : home_httpd, c);
break;
}
}
continue;
}
#endif
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
if (*p0 == '/') {
/* make full path from httpd root / current_path / config_line_path */
cf = (flag == SUBDIR_PARSE ? path : "");
p0 = xmalloc(strlen(cf) + (c - buf) + 2 + strlen(c));
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 + strlen(p0), ":%s", 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
/*
* 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().
*
* Returns a pointer to the encoded string (malloced).
*/
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 */
/*
* 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.
*
* string The first string to decode.
* option_d 1 if called for httpd -d
*
* Returns a pointer to the decoded string (same as input).
*/
static unsigned hex_to_bin(unsigned char c)
{
unsigned v;
v = c - '0';
if (v <= 9)
return v;
/* c | 0x20: letters to lower case, non-letters
* to (potentially different) non-letters */
v = (unsigned)(c | 0x20) - 'a';
if (v <= 5)
return v + 10;
return ~0;
}
/* For testing:
void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
*/
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 v;
if (option_d && c == '+') {
*string++ = ' ';
continue;
}
if (c != '%') {
*string++ = c;
continue;
}
v = hex_to_bin(ptr[0]);
if (v > 15) {
bad_hex:
if (!option_d)
return NULL;
*string++ = '%';
continue;
}
v = (v * 16) | hex_to_bin(ptr[1]);
if (v > 255)
goto bad_hex;
if (!option_d && (v == '/' || v == '\0')) {
/* caller takes it as indication of invalid
* (dangerous wrt exploits) chars */
return orig + 1;
}
*string++ = v;
ptr += 2;
}
*string = '\0';
return orig;
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
/*
* Decode a base64 data stream as per rfc1521.
* Note that the rfc states that non 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: a pointer to a base64 encoded string.
* Decoded data is stored in-place.
*/
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
/*
* Create a listen server socket on the designated port.
*/
static int openServer(void)
{
int n = bb_strtou(bind_addr_or_port, NULL, 10);
if (!errno && n && n <= 0xffff)
n = create_and_bind_stream_or_die(NULL, n);
else
n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
xlisten(n, 9);
return n;
}
/*
* Log the connection closure and exit.
*/
static void log_and_exit(void) ATTRIBUTE_NORETURN;
static void log_and_exit(void)
{
/* Paranoia. IE said to be buggy. It may send some extra data
* or be confused by us just exiting without SHUT_WR. Oh well. */
shutdown(1, SHUT_WR);
ndelay_on(0);
while (read(0, iobuf, IOBUF_SIZE) > 0)
continue;
if (verbose > 2)
bb_error_msg("closed");
_exit(xfunc_error_retval);
}
/*
* 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.
* responseNum - the result code to send.
*/
static void send_headers(int responseNum)
{
static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
const char *responseString = "";
const char *infoString = NULL;
const char *mime_type;
#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
const char *error_page = 0;
#endif
unsigned i;
time_t timer = time(0);
char tmp_str[80];
int len;
for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
if (http_response_type[i] == responseNum) {
responseString = http_response[i].name;
infoString = http_response[i].info;
#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
error_page = http_error_page[i];
#endif
break;
}
}
/* error message is HTML */
mime_type = responseNum == HTTP_OK ?
found_mime_type : "text/html";
if (verbose)
bb_error_msg("response:%u", responseNum);
/* emit the current date */
strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
len = sprintf(iobuf,
"HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
"Date: %s\r\nConnection: close\r\n",
responseNum, responseString, mime_type, tmp_str);
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
if (responseNum == HTTP_UNAUTHORIZED) {
len += sprintf(iobuf + len,
"WWW-Authenticate: Basic realm=\"%s\"\r\n",
g_realm);
}
#endif
if (responseNum == HTTP_MOVED_TEMPORARILY) {
len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
found_moved_temporarily,
(g_query ? "?" : ""),
(g_query ? g_query : ""));
}
#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
if (error_page && !access(error_page, R_OK)) {
strcat(iobuf, "\r\n");
len += 2;
if (DEBUG)
fprintf(stderr, "headers: '%s'\n", iobuf);
full_write(1, iobuf, len);
if (DEBUG)
fprintf(stderr, "writing error page: '%s'\n", error_page);
return send_file_and_exit(error_page, FALSE);
}
#endif
if (file_size != -1) { /* file */
strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
#if ENABLE_FEATURE_HTTPD_RANGES
if (responseNum == HTTP_PARTIAL_CONTENT) {
len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
range_start,
range_end,
file_size);
file_size = range_end - range_start + 1;
}
#endif
len += sprintf(iobuf + len,
#if ENABLE_FEATURE_HTTPD_RANGES
"Accept-Ranges: bytes\r\n"
#endif
"Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
tmp_str,
"Content-length:",
file_size
);
}
iobuf[len++] = '\r';
iobuf[len++] = '\n';
if (infoString) {
len += sprintf(iobuf + len,
"<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
"<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
responseNum, responseString,
responseNum, responseString, infoString);
}
if (DEBUG)
fprintf(stderr, "headers: '%s'\n", iobuf);
if (full_write(1, iobuf, len) != len) {
if (verbose > 1)
bb_perror_msg("error");
log_and_exit();
}
}
static void send_headers_and_exit(int responseNum) ATTRIBUTE_NORETURN;
static void send_headers_and_exit(int responseNum)
{
send_headers(responseNum);
log_and_exit();
}
/*
* Read from the socket until '\n' or EOF. '\r' chars are removed.
* '\n' is replaced with NUL.
* Return number of characters read or 0 if nothing is read
* ('\r' and '\n' are not counted).
* Data is returned in iobuf.
*/
static int get_line(void)
{
int count = 0;
char c;
while (1) {
if (hdr_cnt <= 0) {
hdr_cnt = safe_read(0, hdr_buf, sizeof(hdr_buf));
if (hdr_cnt <= 0)
break;
hdr_ptr = hdr_buf;
}
iobuf[count] = c = *hdr_ptr++;
hdr_cnt--;
if (c == '\r')
continue;
if (c == '\n') {
iobuf[count] = '\0';
return count;
}
if (count < (IOBUF_SIZE - 1)) /* check overflow */
count++;
}
return count;
}
#if ENABLE_FEATURE_HTTPD_CGI
/* gcc 4.2.1 fares better with NOINLINE */
static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) ATTRIBUTE_NORETURN;
static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
{
enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
struct pollfd pfd[3];
int out_cnt; /* we buffer a bit of initial CGI output */
int count;
/* iobuf is used for CGI -> network data,
* hdr_buf is for network -> CGI data (POSTDATA) */
/* If CGI dies, we still want to correctly finish reading its output
* and send it to the peer. So please no SIGPIPEs! */
signal(SIGPIPE, SIG_IGN);
/* NB: breaking out of this loop jumps to log_and_exit() */
out_cnt = 0;
while (1) {
memset(pfd, 0, sizeof(pfd));
pfd[FROM_CGI].fd = fromCgi_rd;
pfd[FROM_CGI].events = POLLIN;
if (toCgi_wr) {
pfd[TO_CGI].fd = toCgi_wr;
if (hdr_cnt > 0) {
pfd[TO_CGI].events = POLLOUT;
} else if (post_len > 0) {
pfd[0].events = POLLIN;
} else {
/* post_len <= 0 && hdr_cnt <= 0:
* no more POST data to CGI,
* let CGI see EOF on CGI's stdin */
close(toCgi_wr);
toCgi_wr = 0;
}
}
/* Now wait on the set of sockets */
count = safe_poll(pfd, 3, -1);
if (count <= 0) {
#if 0
if (waitpid(pid, &status, WNOHANG) <= 0) {
/* Weird. CGI didn't exit and no fd's
* are ready, yet poll returned?! */
continue;
}
if (DEBUG && WIFEXITED(status))
bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
if (DEBUG && WIFSIGNALED(status))
bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
#endif
break;
}
if (pfd[TO_CGI].revents) {
/* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
/* Have data from peer and can write to CGI */
count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
/* Doesn't happen, we dont use nonblocking IO here
*if (count < 0 && errno == EAGAIN) {
* ...
*} else */
if (count > 0) {
hdr_ptr += count;
hdr_cnt -= count;
} else {
/* EOF/broken pipe to CGI, stop piping POST data */
hdr_cnt = post_len = 0;
}
}
if (pfd[0].revents) {
/* post_len > 0 && hdr_cnt == 0 here */
/* We expect data, prev data portion is eaten by CGI
* and there *is* data to read from the peer
* (POSTDATA) */
//count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
//count = safe_read(0, hdr_buf, count);
count = safe_read(0, hdr_buf, sizeof(hdr_buf));
if (count > 0) {
hdr_cnt = count;
hdr_ptr = hdr_buf;
post_len -= count;
} else {
/* no more POST data can be read */
post_len = 0;
}
}
if (pfd[FROM_CGI].revents) {
/* There is something to read from CGI */
char *rbuf = iobuf;
/* Are we still buffering CGI output? */
if (out_cnt >= 0) {
/* HTTP_200[] has single "\r\n" at the end.
* 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 */
/* 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(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
if (count <= 0) {
/* eof (or error) and there was no "HTTP",
* so write it, then write received data */
if (out_cnt) {
full_write(1, HTTP_200, sizeof(HTTP_200)-1);
full_write(1, rbuf, out_cnt);
}
break; /* CGI stdout is closed, exiting */
}
out_cnt += count;
count = 0;
/* "Status" header format is: "Status: 302 Redirected\r\n" */
if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
/* send "HTTP/1.0 " */
if (full_write(1, HTTP_200, 9) != 9)
break;
rbuf += 8; /* skip "Status: " */
count = out_cnt - 8;
out_cnt = -1; /* buffering off */
} else if (out_cnt >= 4) {
/* Did CGI add "HTTP"? */
if (memcmp(rbuf, HTTP_200, 4) != 0) {
/* there is no "HTTP", do it ourself */
if (full_write(1, 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 = out_cnt;
out_cnt = -1; /* buffering off */
}
} else {
count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
if (count <= 0)
break; /* eof (or error) */
}
if (full_write(1, rbuf, count) != count)
break;
if (DEBUG)
fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
} /* if (pfd[FROM_CGI].revents) */
} /* while (1) */
log_and_exit();
}
static void setenv1(const char *name, const char *value)
{
setenv(name, value ? value : "", 1);
}
/*
* Spawn CGI script, forward CGI's stdin/out <=> network
*
* 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 post_len Length of the POST body.
* const char *cookie For set HTTP_COOKIE.
* const char *content_type For set CONTENT_TYPE.
*/
static void send_cgi_and_exit(
const char *url,
const char *request,
int post_len,
const char *cookie,
const char *content_type) ATTRIBUTE_NORETURN;
static void send_cgi_and_exit(
const char *url,
const char *request,
int post_len,
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 *script;
char *purl;
int pid;
/*
* We are mucking with environment _first_ and then vfork/exec,
* this allows us to use vfork safely. Parent don't care about
* these environment changes anyway.
*/
/*
* Find PATH_INFO.
*/
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)) {
/* 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) {
putenv(xasprintf("%s=%s?%s", "REQUEST_URI", purl, g_query));
} 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 ? 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 = ':';
#if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
setenv1("REMOTE_PORT", cp + 1);
#endif
}
}
setenv1("HTTP_USER_AGENT", user_agent);
if (post_len)
putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
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);
xpipe(&fromCgi.rd);
xpipe(&toCgi.rd);
pid = vfork();
if (pid < 0) {
/* TODO: log perror? */
log_and_exit();
}
if (!pid) {
/* Child process */
xfunc_error_retval = 242;
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);
/* User seeing stderr output can be a security problem.
* If CGI really wants that, it can always do dup itself. */
/* dup2(1, 2); */
/* script must have absolute path */
script = strrchr(fullpath, '/');
if (!script)
goto error_execing_cgi;
*script = '\0';
/* chdiring to script's dir */
if (chdir(fullpath) == 0) {
char *argv[2];
#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 = '/';
/* set argv[0] to name without path */
argv[0] = (char*)bb_basename(purl);
argv[1] = NULL;
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
if (interpr)
execv(interpr, argv);
else
#endif
execv(fullpath, argv);
}
error_execing_cgi:
/* send to stdout
* (we are CGI here, our stdout is pumped to the net) */
send_headers_and_exit(HTTP_NOT_FOUND);
} /* end child */
/* Parent process */
/* Restore variables possibly changed by child */
xfunc_error_retval = 0;
/* Pump data */
close(fromCgi.wr);
close(toCgi.rd);
cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
}
#endif /* FEATURE_HTTPD_CGI */
/*
* Send a file response to a HTTP request, and exit
*
* Parameters:
* const char *url The requested URL (with leading /).
* headers Don't send headers before if FALSE.
*/
static void send_file_and_exit(const char *url, int headers)
{
static const char *const suffixTable[] = {
/* Warning: shorter 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
NULL
};
char *suffix;
int f;
const char *const *table;
const char *try_suffix;
ssize_t count;
#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
off_t offset;
#endif
suffix = strrchr(url, '.');
/* If not found, set default as "application/octet-stream"; */
found_mime_type = "application/octet-stream";
if (suffix) {
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
Htaccess *cur;
#endif
for (table = suffixTable; *table; table += 2) {
try_suffix = strstr(table[0], suffix);
if (try_suffix) {
try_suffix += strlen(suffix);
if (*try_suffix == '\0' || *try_suffix == '.') {
found_mime_type = table[1];
break;
}
}
}
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
for (cur = mime_a; cur; cur = cur->next) {
if (strcmp(cur->before_colon, suffix) == 0) {
found_mime_type = cur->after_colon;
break;
}
}
#endif
}
if (DEBUG)
bb_error_msg("sending file '%s' content-type: %s",
url, found_mime_type);
f = open(url, O_RDONLY);
if (f < 0) {
if (DEBUG)
bb_perror_msg("cannot open '%s'", url);
if (headers)
send_headers_and_exit(HTTP_NOT_FOUND);
}
#if ENABLE_FEATURE_HTTPD_RANGES
if (!headers)
range_start = 0; /* err pages and ranges don't mix */
range_len = MAXINT(off_t);
if (range_start) {
if (!range_end) {
range_end = file_size - 1;
}
if (range_end < range_start
|| lseek(f, range_start, SEEK_SET) != range_start
) {
lseek(f, 0, SEEK_SET);
range_start = 0;
} else {
range_len = range_end - range_start + 1;
send_headers(HTTP_PARTIAL_CONTENT);
headers = 0;
}
}
#endif
if (headers)
send_headers(HTTP_OK);
/* If you want to know about EPIPE below
* (happens if you abort downloads from local httpd): */
signal(SIGPIPE, SIG_IGN);
#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
offset = range_start;
do {
/* sz is rounded down to 64k */
ssize_t sz = MAXINT(ssize_t) - 0xffff;
USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
count = sendfile(1, f, &offset, sz);
if (count < 0) {
if (offset == range_start)
goto fallback;
goto fin;
}
USE_FEATURE_HTTPD_RANGES(range_len -= sz;)
} while (count > 0 && range_len);
log_and_exit();
fallback:
#endif
while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) {
ssize_t n;
USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
n = full_write(1, iobuf, count);
if (count != n)
break;
USE_FEATURE_HTTPD_RANGES(range_len -= count;)
if (!range_len)
break;
}
#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
fin:
#endif
if (count < 0 && verbose > 1)
bb_perror_msg("error");
log_and_exit();
}
static int checkPermIP(void)
{
Htaccess_IP *cur;
/* This could stand some work */
for (cur = ip_a_d; cur; cur = cur->next) {
#if DEBUG
fprintf(stderr,
"checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
rmt_ip_str,
(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;
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
/*
* 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
*
* path The file path.
* request User information to validate.
*
* Returns 1 if request is OK.
*/
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 doesn't match */
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 */
/*
* Handle timeouts
*/
static void exit_on_signal(int sig) ATTRIBUTE_NORETURN;
static void exit_on_signal(int sig)
{
send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
}
/*
* Handle an incoming http request and exit.
*/
static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) ATTRIBUTE_NORETURN;
static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
{
static const char request_GET[] ALIGN1 = "GET";
struct stat sb;
char *urlcopy;
char *urlp;
char *tptr;
int http_major_version;
int ip_allowed;
#if ENABLE_FEATURE_HTTPD_CGI
const char *prequest;
unsigned long length = 0;
char *cookie = 0;
char *content_type = 0;
#endif
struct sigaction sa;
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
int credentials = -1; /* if not required this is Ok */
#endif
/* Allocation of iobuf is postponed until now
* (IOW, server process doesn't need to waste 8k) */
iobuf = xmalloc(IOBUF_SIZE);
rmt_ip = 0;
if (fromAddr->sa.sa_family == AF_INET) {
rmt_ip = ntohl(fromAddr->sin.sin_addr.s_addr);
}
#if ENABLE_FEATURE_IPV6
if (fromAddr->sa.sa_family == AF_INET6
&& fromAddr->sin6.sin6_addr.s6_addr32[0] == 0
&& fromAddr->sin6.sin6_addr.s6_addr32[1] == 0
&& ntohl(fromAddr->sin6.sin6_addr.s6_addr32[2]) == 0xffff)
rmt_ip = ntohl(fromAddr->sin6.sin6_addr.s6_addr32[3]);
#endif
if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->sa);
}
if (verbose) {
/* this trick makes -v logging much simpler */
applet_name = rmt_ip_str;
if (verbose > 2)
bb_error_msg("connected");
}
/* Install timeout handler */
memset(&sa, 0, sizeof(sa));
sa.sa_handler = exit_on_signal;
/* sigemptyset(&sa.sa_mask); - memset should be enough */
/*sa.sa_flags = 0; - no SA_RESTART */
sigaction(SIGALRM, &sa, NULL);
alarm(HEADER_READ_TIMEOUT);
if (!get_line()) /* EOF or error or empty line */
send_headers_and_exit(HTTP_BAD_REQUEST);
/* Determine type of request (GET/POST) */
urlp = strpbrk(iobuf, " \t");
if (urlp == NULL)
send_headers_and_exit(HTTP_BAD_REQUEST);
*urlp++ = '\0';
#if ENABLE_FEATURE_HTTPD_CGI
prequest = request_GET;
if (strcasecmp(iobuf, prequest) != 0) {
prequest = "POST";
if (strcasecmp(iobuf, prequest) != 0)
send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
}
#else
if (strcasecmp(iobuf, request_GET) != 0)
send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
#endif
urlp = skip_whitespace(urlp);
if (urlp[0] != '/')
send_headers_and_exit(HTTP_BAD_REQUEST);
/* Find end of URL and parse HTTP version, if any */
http_major_version = -1;
tptr = strchrnul(urlp, ' ');
/* Is it " HTTP/"? */
if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0)
http_major_version = (tptr[6] - '0');
*tptr = '\0';
/* Copy URL from after "GET "/"POST " to stack-allocated char[] */
urlcopy = alloca((tptr - urlp) + sizeof("/index.html"));
/*if (urlcopy == NULL)
* send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
strcpy(urlcopy, urlp);
/* NB: urlcopy ptr is never changed after this */
/* Extract url args if present */
tptr = strchr(urlcopy, '?');
g_query = NULL;
if (tptr) {
*tptr++ = '\0';
g_query = tptr;
}
/* Decode URL escape sequences */
tptr = decodeString(urlcopy, 0);
if (tptr == NULL)
send_headers_and_exit(HTTP_BAD_REQUEST);
if (tptr == urlcopy + 1) {
/* '/' or NUL is encoded */
send_headers_and_exit(HTTP_NOT_FOUND);
}
/* Canonicalize path */
/* Algorithm stolen from libbb bb_simplify_path(),
* but don't strdup and reducing trailing slash and protect out root */
urlp = tptr = urlcopy;
do {
if (*urlp == '/') {
/* skip duplicate (or initial) slash */
if (*tptr == '/') {
continue;
}
if (*tptr == '.') {
/* skip extra '.' */
if (tptr[1] == '/' || !tptr[1]) {
continue;
}
/* '..': be careful */
if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
++tptr;
if (urlp == urlcopy) /* protect root */
send_headers_and_exit(HTTP_BAD_REQUEST);
while (*--urlp != '/') /* omit previous dir */;
continue;
}
}
}
*++urlp = *tptr;
} while (*++tptr);
*++urlp = '\0'; /* so keep last character */
tptr = urlp; /* end ptr */
/* If URL is a directory, add '/' */
if (tptr[-1] != '/') {
if (is_directory(urlcopy + 1, 1, &sb)) {
found_moved_temporarily = urlcopy;
}
}
/* Log it */
if (verbose > 1)
bb_error_msg("url:%s", urlcopy);
tptr = urlcopy;
ip_allowed = checkPermIP();
while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
/* have path1/path2 */
*tptr = '\0';
if (is_directory(urlcopy + 1, 1, &sb)) {
/* may be having subdir config */
parse_conf(urlcopy + 1, SUBDIR_PARSE);
ip_allowed = checkPermIP();
}
*tptr = '/';
}
if (http_major_version >= 0) {
/* Request was with "... HTTP/nXXX", and n >= 0 */
/* Read until blank line for HTTP version specified, else parse immediate */
while (1) {
alarm(HEADER_READ_TIMEOUT);
if (!get_line())
break; /* EOF or error or empty line */
if (DEBUG)
bb_error_msg("header: '%s'", iobuf);
#if ENABLE_FEATURE_HTTPD_CGI
/* try and do our best to parse more lines */
if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
/* extra read only for POST */
if (prequest != request_GET) {
tptr = iobuf + sizeof("Content-length:") - 1;
if (!tptr[0])
send_headers_and_exit(HTTP_BAD_REQUEST);
errno = 0;
/* not using strtoul: it ignores leading minus! */
length = strtol(tptr, &tptr, 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 (tptr[0] || errno || length > INT_MAX)
send_headers_and_exit(HTTP_BAD_REQUEST);
}
} else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
cookie = strdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
} else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
content_type = strdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
} else if (STRNCASECMP(iobuf, "Referer:") == 0) {
referer = strdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
} else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
user_agent = strdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
}
#endif
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
if (STRNCASECMP(iobuf, "Authorization:") == 0) {
/* We only allow Basic credentials.
* It shows up as "Authorization: Basic <userid:password>" where
* the userid:password is base64 encoded.
*/
tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
if (STRNCASECMP(tptr, "Basic") != 0)
continue;
tptr += sizeof("Basic")-1;
/* decodeBase64() skips whitespace itself */
decodeBase64(tptr);
credentials = checkPerm(urlcopy, tptr);
}
#endif /* FEATURE_HTTPD_BASIC_AUTH */
#if ENABLE_FEATURE_HTTPD_RANGES
if (STRNCASECMP(iobuf, "Range:") == 0) {
// We know only bytes=NNN-[MMM]
char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
if (strncmp(s, "bytes=", 6) == 0) {
s += sizeof("bytes=")-1;
range_start = BB_STRTOOFF(s, &s, 10);
if (s[0] != '-' || range_start < 0) {
range_start = 0;
} else if (s[1]) {
range_end = BB_STRTOOFF(s+1, NULL, 10);
if (errno || range_end < range_start)
range_start = 0;
}
}
}
#endif
} /* while extra header reading */
}
/* We read headers, disable peer timeout */
alarm(0);
if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) {
/* protect listing [/path]/httpd_conf or IP deny */
send_headers_and_exit(HTTP_FORBIDDEN);
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) {
send_headers_and_exit(HTTP_UNAUTHORIZED);
}
#endif
if (found_moved_temporarily) {
send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
}
tptr = urlcopy + 1; /* skip first '/' */
#if ENABLE_FEATURE_HTTPD_CGI
if (strncmp(tptr, "cgi-bin/", 8) == 0) {
if (tptr[8] == '\0') {
/* protect listing "cgi-bin/" */
send_headers_and_exit(HTTP_FORBIDDEN);
}
send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
}
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
{
char *suffix = strrchr(tptr, '.');
if (suffix) {
Htaccess *cur;
for (cur = script_i; cur; cur = cur->next) {
if (strcmp(cur->before_colon + 1, suffix) == 0) {
send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
}
}
}
}
#endif
if (prequest != request_GET) {
send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
}
#endif /* FEATURE_HTTPD_CGI */
if (urlp[-1] == '/')
strcpy(urlp, "index.html");
if (stat(tptr, &sb) == 0) {
file_size = sb.st_size;
last_mod = sb.st_mtime;
}
#if ENABLE_FEATURE_HTTPD_CGI
else if (urlp[-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) {
urlp[0] = '\0';
g_query = urlcopy;
send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
}
}
#endif
/* else {
* fall through to send_file, it errors out if open fails
* }
*/
send_file_and_exit(tptr, TRUE);
}
/*
* The main http server function.
* Given a socket, listen for new connections and farm out
* the processing as a [v]forked process.
* Never returns.
*/
#if BB_MMU
static void mini_httpd(int server_socket) ATTRIBUTE_NORETURN;
static void mini_httpd(int server_socket)
{
/* NB: it's best to not use xfuncs in this loop before fork().
* Otherwise server may die on transient errors (temporary
* out-of-memory condition, etc), which is Bad(tm).
* Try to do any dangerous calls after fork.
*/
while (1) {
int n;
len_and_sockaddr fromAddr;
/* Wait for connections... */
fromAddr.len = LSA_SIZEOF_SA;
n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
if (n < 0)
continue;
/* set the KEEPALIVE option to cull dead connections */
setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
if (fork() == 0) {
/* child */
#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
/* Do not reload config on HUP */
signal(SIGHUP, SIG_IGN);
#endif
close(server_socket);
xmove_fd(n, 0);
xdup2(0, 1);
handle_incoming_and_exit(&fromAddr);
}
/* parent, or fork failed */
close(n);
} /* while (1) */
/* never reached */
}
#else
static void mini_httpd_nommu(int server_socket, int argc, char **argv) ATTRIBUTE_NORETURN;
static void mini_httpd_nommu(int server_socket, int argc, char **argv)
{
char *argv_copy[argc + 2];
argv_copy[0] = argv[0];
argv_copy[1] = (char*)"-i";
memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
/* NB: it's best to not use xfuncs in this loop before vfork().
* Otherwise server may die on transient errors (temporary
* out-of-memory condition, etc), which is Bad(tm).
* Try to do any dangerous calls after fork.
*/
while (1) {
int n;
len_and_sockaddr fromAddr;
/* Wait for connections... */
fromAddr.len = LSA_SIZEOF_SA;
n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
if (n < 0)
continue;
/* set the KEEPALIVE option to cull dead connections */
setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
if (vfork() == 0) {
/* child */
#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
/* Do not reload config on HUP */
signal(SIGHUP, SIG_IGN);
#endif
close(server_socket);
xmove_fd(n, 0);
xdup2(0, 1);
/* Run a copy of ourself in inetd mode */
re_exec(argv_copy);
}
/* parent, or vfork failed */
close(n);
} /* while (1) */
/* never reached */
}
#endif
/*
* Process a HTTP connection on stdin/out.
* Never returns.
*/
static void mini_httpd_inetd(void) ATTRIBUTE_NORETURN;
static void mini_httpd_inetd(void)
{
len_and_sockaddr fromAddr;
fromAddr.len = LSA_SIZEOF_SA;
getpeername(0, &fromAddr.sa, &fromAddr.len);
handle_incoming_and_exit(&fromAddr);
}
#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
static void sighup_handler(int sig)
{
struct sigaction sa;
parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sighup_handler;
/*sigemptyset(&sa.sa_mask); - memset should be enough */
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,
p_opt_verbose ,
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,
OPT_VERBOSE = 1 << p_opt_verbose,
};
int httpd_main(int argc, char **argv);
int httpd_main(int argc, char **argv)
{
int server_socket = server_socket; /* for gcc */
unsigned opt;
char *url_for_decode;
USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
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;)
INIT_G();
#if ENABLE_LOCALE_SUPPORT
/* Undo busybox.c: we want to speak English in http (dates etc) */
setlocale(LC_TIME, "C");
#endif
home_httpd = xrealloc_getcwd_or_warn(NULL);
/* -v counts, -i implies -f */
opt_complementary = "vv:if";
/* 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(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:ifv",
&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)
, &bind_addr_or_port
, &verbose
);
if (opt & OPT_DECODE_URL) {
fputs(decodeString(url_for_decode, 1), stdout);
return 0;
}
#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
if (opt & OPT_ENCODE_URL) {
fputs(encodeString(url_for_encode), stdout);
return 0;
}
#endif
#if ENABLE_FEATURE_HTTPD_AUTH_MD5
if (opt & OPT_MD5) {
puts(pw_encrypt(pass, "$1$"));
return 0;
}
#endif
#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
#if !BB_MMU
if (!(opt & OPT_FOREGROUND)) {
bb_daemonize_or_rexec(0, argv); /* don't change current directory */
}
#endif
xchdir(home_httpd);
if (!(opt & OPT_INETD)) {
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
}
#if 0 /*was #if ENABLE_FEATURE_HTTPD_CGI*/
/* User can do it himself: 'env - PATH="$PATH" httpd'
* We don't do it because we don't want to screw users
* which want to do
* 'env - VAR1=val1 VAR2=val2 https'
* and have VAR1 and VAR2 values visible in their CGIs.
* Besides, it is also smaller. */
{
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", ???);
}
#endif
#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
if (!(opt & OPT_INETD))
sighup_handler(0);
else /* do not install HUP handler in inetd mode */
#endif
parse_conf(default_path_httpd_conf, FIRST_PARSE);
xfunc_error_retval = 0;
if (opt & OPT_INETD)
mini_httpd_inetd();
#if BB_MMU
if (!(opt & OPT_FOREGROUND))
bb_daemonize(0); /* don't change current directory */
mini_httpd(server_socket); /* never returns */
#else
mini_httpd_nommu(server_socket, argc, argv); /* never returns */
#endif
/* return 0; */
}
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