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libhttpd.c
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/* libhttpd.c - HTTP protocol library
**
** Copyright © 2017,2018 by Paul Wratt <[email protected]>.
** Copyright © 1995,1998,1999,2000,2001,2015 by
** Jef Poskanzer <[email protected]>. All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE.
*/
#include "config.h"
#include "version.h"
#ifdef SHOW_SERVER_VERSION
#define EXPOSED_SERVER_SOFTWARE SERVER_SOFTWARE
#else /* SHOW_SERVER_VERSION */
#define EXPOSED_SERVER_SOFTWARE "mthttpd"
#endif /* SHOW_SERVER_VERSION */
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif /* HAVE_MEMORY_H */
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <stdarg.h>
#ifdef HAVE_OSRELDATE_H
#include <osreldate.h>
#endif /* HAVE_OSRELDATE_H */
#ifdef HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# ifdef HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
# include <ndir.h>
# endif
#endif
#include "libhttpd.h"
#include "mmc.h"
#include "timers.h"
#include "match.h"
#include "tdate_parse.h"
#ifndef STDIN_FILENO
#define STDIN_FILENO 0
#endif
#ifndef STDOUT_FILENO
#define STDOUT_FILENO 1
#endif
#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif
#ifndef SHUT_WR
#define SHUT_WR 1
#endif
#ifndef HAVE_INT64T
typedef long long int64_t;
#endif
#ifndef HAVE_SOCKLENT
typedef int socklen_t;
#endif
#ifdef __CYGWIN__
#define timezone _timezone
#endif
#ifndef MAX
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
/* Forwards. */
static void check_options( void );
static void free_httpd_server( httpd_server* hs );
static int initialize_listen_socket( httpd_sockaddr* saP );
static void add_response( httpd_conn* hc, char* str );
static void send_mime( httpd_conn* hc, int status, char* title, char* encodings, char* extraheads, char* type, off_t length, time_t mod );
static void send_response( httpd_conn* hc, int status, char* title, char* extraheads, char* form, char* arg );
static void send_response_tail( httpd_conn* hc );
static void defang( char* str, char* dfstr, int dfsize );
#ifdef ERR_DIR
static int send_err_file( httpd_conn* hc, int status, char* title, char* extraheads, char* filename );
#endif /* ERR_DIR */
#ifdef AUTH_FILE
static void send_authenticate( httpd_conn* hc, char* realm );
static int b64_decode( const char* str, unsigned char* space, int size );
static int auth_check( httpd_conn* hc, char* dirname );
static int auth_check2( httpd_conn* hc, char* dirname );
#endif /* AUTH_FILE */
static void send_dirredirect( httpd_conn* hc );
static int hexit( char c );
static void strdecode( char* to, char* from );
#ifdef GENERATE_INDEXES
static void strencode( char* to, int tosize, char* from );
#endif /* GENERATE_INDEXES */
#ifdef TILDE_MAP_1
static int tilde_map_1( httpd_conn* hc );
#endif /* TILDE_MAP_1 */
#ifdef TILDE_MAP_2
static int tilde_map_2( httpd_conn* hc );
#endif /* TILDE_MAP_2 */
static int vhost_map( httpd_conn* hc );
static char* expand_symlinks( char* path, char** restP, int no_symlink_check, int tildemapped );
static char* bufgets( httpd_conn* hc );
static void de_dotdot( char* file );
static void init_mime( void );
static void figure_mime( httpd_conn* hc );
#ifdef CGI_TIMELIMIT
static void cgi_kill2( ClientData client_data, struct timeval* nowP );
static void cgi_kill( ClientData client_data, struct timeval* nowP );
#endif /* CGI_TIMELIMIT */
#ifdef GENERATE_INDEXES
static int ls( httpd_conn* hc );
#endif /* GENERATE_INDEXES */
static char* build_env( char* fmt, char* arg );
#ifdef SERVER_NAME_LIST
static char* hostname_map( char* hostname );
#endif /* SERVER_NAME_LIST */
static char** make_envp( httpd_conn* hc );
static char** make_argp( httpd_conn* hc );
static void cgi_interpose_input( httpd_conn* hc, int wfd );
static void post_post_garbage_hack( httpd_conn* hc );
static void cgi_interpose_output( httpd_conn* hc, int rfd );
static void cgi_child( httpd_conn* hc );
static int cgi( httpd_conn* hc );
static int really_start_request( httpd_conn* hc, struct timeval* nowP );
static void make_log_entry( httpd_conn* hc, struct timeval* nowP );
static int check_referrer( httpd_conn* hc );
static int really_check_referrer( httpd_conn* hc );
static int sockaddr_check( httpd_sockaddr* saP );
static size_t sockaddr_len( httpd_sockaddr* saP );
static int my_snprintf( char* str, size_t size, const char* format, ... );
#ifndef HAVE_ATOLL
static long long atoll( const char* str );
#endif /* HAVE_ATOLL */
/* This global keeps track of whether we are in the main process or a
** sub-process. The reason is that httpd_write_response() can get called
** in either context; when it is called from the main process it must use
** non-blocking I/O to avoid stalling the server, but when it is called
** from a sub-process it wants to use blocking I/O so that the whole
** response definitely gets written. So, it checks this variable. A bit
** of a hack but it seems to do the right thing.
*/
static int sub_process = 0;
static void
check_options( void )
{
#if defined(TILDE_MAP_1) && defined(TILDE_MAP_2)
syslog( LOG_CRIT, "both TILDE_MAP_1 and TILDE_MAP_2 are defined" );
exit( 1 );
#endif /* both */
}
static void
free_httpd_server( httpd_server* hs )
{
if ( hs->binding_hostname != (char*) 0 )
free( (void*) hs->binding_hostname );
if ( hs->cwd != (char*) 0 )
free( (void*) hs->cwd );
if ( hs->cgi_pattern != (char*) 0 )
free( (void*) hs->cgi_pattern );
if ( hs->charset != (char*) 0 )
free( (void*) hs->charset );
if ( hs->p3p != (char*) 0 )
free( (void*) hs->p3p );
if ( hs->url_pattern != (char*) 0 )
free( (void*) hs->url_pattern );
if ( hs->local_pattern != (char*) 0 )
free( (void*) hs->local_pattern );
free( (void*) hs );
}
httpd_server*
httpd_initialize(
char* hostname, httpd_sockaddr* sa4P, httpd_sockaddr* sa6P,
unsigned short port, char* cgi_pattern, int cgi_limit, char* charset,
char* p3p, int max_age, char* cwd, int no_log, FILE* logfp,
int no_symlink_check, int vhost, int global_passwd, char* url_pattern,
char* local_pattern, int no_empty_referrers )
{
httpd_server* hs;
static char ghnbuf[256];
char* cp;
check_options();
hs = NEW( httpd_server, 1 );
if ( hs == (httpd_server*) 0 )
{
syslog( LOG_CRIT, "out of memory allocating an httpd_server" );
return (httpd_server*) 0;
}
if ( hostname != (char*) 0 )
{
hs->binding_hostname = strdup( hostname );
if ( hs->binding_hostname == (char*) 0 )
{
syslog( LOG_CRIT, "out of memory copying hostname" );
return (httpd_server*) 0;
}
hs->server_hostname = hs->binding_hostname;
}
else
{
hs->binding_hostname = (char*) 0;
hs->server_hostname = (char*) 0;
if ( gethostname( ghnbuf, sizeof(ghnbuf) ) < 0 )
ghnbuf[0] = '\0';
#ifdef SERVER_NAME_LIST
if ( ghnbuf[0] != '\0' )
hs->server_hostname = hostname_map( ghnbuf );
#endif /* SERVER_NAME_LIST */
if ( hs->server_hostname == (char*) 0 )
{
#ifdef SERVER_NAME
hs->server_hostname = SERVER_NAME;
#else /* SERVER_NAME */
if ( ghnbuf[0] != '\0' )
hs->server_hostname = ghnbuf;
#endif /* SERVER_NAME */
}
}
hs->port = port;
if ( cgi_pattern == (char*) 0 )
hs->cgi_pattern = (char*) 0;
else
{
/* Nuke any leading slashes. */
if ( cgi_pattern[0] == '/' )
++cgi_pattern;
hs->cgi_pattern = strdup( cgi_pattern );
if ( hs->cgi_pattern == (char*) 0 )
{
syslog( LOG_CRIT, "out of memory copying cgi_pattern" );
return (httpd_server*) 0;
}
/* Nuke any leading slashes in the cgi pattern. */
while ( ( cp = strstr( hs->cgi_pattern, "|/" ) ) != (char*) 0 )
(void) ol_strcpy( cp + 1, cp + 2 );
}
hs->cgi_limit = cgi_limit;
hs->cgi_count = 0;
hs->charset = strdup( charset );
hs->p3p = strdup( p3p );
hs->max_age = max_age;
hs->cwd = strdup( cwd );
if ( hs->cwd == (char*) 0 )
{
syslog( LOG_CRIT, "out of memory copying cwd" );
return (httpd_server*) 0;
}
if ( url_pattern == (char*) 0 )
hs->url_pattern = (char*) 0;
else
{
hs->url_pattern = strdup( url_pattern );
if ( hs->url_pattern == (char*) 0 )
{
syslog( LOG_CRIT, "out of memory copying url_pattern" );
return (httpd_server*) 0;
}
}
if ( local_pattern == (char*) 0 )
hs->local_pattern = (char*) 0;
else
{
hs->local_pattern = strdup( local_pattern );
if ( hs->local_pattern == (char*) 0 )
{
syslog( LOG_CRIT, "out of memory copying local_pattern" );
return (httpd_server*) 0;
}
}
hs->no_log = no_log;
hs->logfp = (FILE*) 0;
httpd_set_logfp( hs, logfp );
hs->no_symlink_check = no_symlink_check;
hs->vhost = vhost;
hs->global_passwd = global_passwd;
hs->no_empty_referrers = no_empty_referrers;
/* Initialize listen sockets. Try v6 first because of a Linux peculiarity;
** like some other systems, it has magical v6 sockets that also listen for
** v4, but in Linux if you bind a v4 socket first then the v6 bind fails.
*/
if ( sa6P == (httpd_sockaddr*) 0 )
hs->listen6_fd = -1;
else
hs->listen6_fd = initialize_listen_socket( sa6P );
if ( sa4P == (httpd_sockaddr*) 0 )
hs->listen4_fd = -1;
else
hs->listen4_fd = initialize_listen_socket( sa4P );
/* If we didn't get any valid sockets, fail. */
if ( hs->listen4_fd == -1 && hs->listen6_fd == -1 )
{
free_httpd_server( hs );
return (httpd_server*) 0;
}
init_mime();
/* Done initializing. */
if ( hs->binding_hostname == (char*) 0 )
syslog(
LOG_NOTICE, "%.80s starting on port %d", SERVER_SOFTWARE,
(int) hs->port );
else
syslog(
LOG_NOTICE, "%.80s starting on %.80s, port %d", SERVER_SOFTWARE,
httpd_ntoa( hs->listen4_fd != -1 ? sa4P : sa6P ),
(int) hs->port );
return hs;
}
static int
initialize_listen_socket( httpd_sockaddr* saP )
{
int listen_fd;
int on, flags;
/* Check sockaddr. */
if ( ! sockaddr_check( saP ) )
{
syslog( LOG_CRIT, "unknown sockaddr family on listen socket" );
return -1;
}
/* Create socket. */
listen_fd = socket( saP->sa.sa_family, SOCK_STREAM, 0 );
if ( listen_fd < 0 )
{
syslog( LOG_CRIT, "socket %.80s - %m", httpd_ntoa( saP ) );
return -1;
}
(void) fcntl( listen_fd, F_SETFD, 1 );
/* Allow reuse of local addresses. */
on = 1;
if ( setsockopt(
listen_fd, SOL_SOCKET, SO_REUSEADDR, (char*) &on,
sizeof(on) ) < 0 )
syslog( LOG_CRIT, "setsockopt SO_REUSEADDR - %m" );
/* Bind to it. */
if ( bind( listen_fd, &saP->sa, sockaddr_len( saP ) ) < 0 )
{
syslog(
LOG_CRIT, "bind %.80s - %m", httpd_ntoa( saP ) );
(void) close( listen_fd );
return -1;
}
/* Set the listen file descriptor to no-delay / non-blocking mode. */
flags = fcntl( listen_fd, F_GETFL, 0 );
if ( flags == -1 )
{
syslog( LOG_CRIT, "fcntl F_GETFL - %m" );
(void) close( listen_fd );
return -1;
}
if ( fcntl( listen_fd, F_SETFL, flags | O_NDELAY ) < 0 )
{
syslog( LOG_CRIT, "fcntl O_NDELAY - %m" );
(void) close( listen_fd );
return -1;
}
/* Start a listen going. */
if ( listen( listen_fd, LISTEN_BACKLOG ) < 0 )
{
syslog( LOG_CRIT, "listen - %m" );
(void) close( listen_fd );
return -1;
}
/* Use accept filtering, if available. */
#ifdef SO_ACCEPTFILTER
{
#if ( __FreeBSD_version >= 411000 )
#define ACCEPT_FILTER_NAME "httpready"
#else
#define ACCEPT_FILTER_NAME "dataready"
#endif
struct accept_filter_arg af;
(void) bzero( &af, sizeof(af) );
(void) strcpy( af.af_name, ACCEPT_FILTER_NAME );
(void) setsockopt(
listen_fd, SOL_SOCKET, SO_ACCEPTFILTER, (char*) &af, sizeof(af) );
}
#endif /* SO_ACCEPTFILTER */
return listen_fd;
}
void
httpd_set_logfp( httpd_server* hs, FILE* logfp )
{
if ( hs->logfp != (FILE*) 0 )
(void) fclose( hs->logfp );
hs->logfp = logfp;
}
void
httpd_terminate( httpd_server* hs )
{
httpd_unlisten( hs );
if ( hs->logfp != (FILE*) 0 )
(void) fclose( hs->logfp );
free_httpd_server( hs );
}
void
httpd_unlisten( httpd_server* hs )
{
if ( hs->listen4_fd != -1 )
{
(void) close( hs->listen4_fd );
hs->listen4_fd = -1;
}
if ( hs->listen6_fd != -1 )
{
(void) close( hs->listen6_fd );
hs->listen6_fd = -1;
}
}
/* Conditional macro to allow two alternate forms for use in the built-in
** error pages. If EXPLICIT_ERROR_PAGES is defined, the second and more
** explicit error form is used; otherwise, the first and more generic
** form is used.
*/
#ifdef EXPLICIT_ERROR_PAGES
#define ERROR_FORM(a,b) b
#else /* EXPLICIT_ERROR_PAGES */
#define ERROR_FORM(a,b) a
#endif /* EXPLICIT_ERROR_PAGES */
static char* ok200title = "OK";
static char* ok206title = "Partial Content";
static char* err302title = "Found";
static char* err302form = "The actual URL is '%.80s'.\n";
static char* err304title = "Not Modified";
char* httpd_err400title = "Bad Request";
char* httpd_err400form =
"Your request has bad syntax or is inherently impossible to satisfy.\n";
#ifdef AUTH_FILE
static char* err401title = "Unauthorized";
static char* err401form =
"Authorization required for the URL '%.80s'.\n";
#endif /* AUTH_FILE */
static char* err403title = "Forbidden";
#ifndef EXPLICIT_ERROR_PAGES
static char* err403form =
"You do not have permission to get URL '%.80s' from this server.\n";
#endif /* !EXPLICIT_ERROR_PAGES */
static char* err404title = "Not Found";
static char* err404form =
"The requested URL '%.80s' was not found on this server.\n";
char* httpd_err408title = "Request Timeout";
char* httpd_err408form =
"No request appeared within a reasonable time period.\n";
static char* err451title = "Unavailable For Legal Reasons";
static char* err451form =
"You do not have legal permission to get URL '%.80s' from this server.\n";
static char* err500title = "Internal Error";
static char* err500form =
"There was an unusual problem serving the requested URL '%.80s'.\n";
static char* err501title = "Not Implemented";
static char* err501form =
"The requested method '%.80s' is not implemented by this server.\n";
char* httpd_err503title = "Service Temporarily Overloaded";
char* httpd_err503form =
"The requested URL '%.80s' is temporarily overloaded. Please try again later.\n";
/* Append a string to the buffer waiting to be sent as response. */
static void
add_response( httpd_conn* hc, char* str )
{
size_t len;
len = strlen( str );
httpd_realloc_str( &hc->response, &hc->maxresponse, hc->responselen + len );
(void) memmove( &(hc->response[hc->responselen]), str, len );
hc->responselen += len;
}
/* Send the buffered response. */
void
httpd_write_response( httpd_conn* hc )
{
/* If we are in a sub-process, turn off no-delay mode. */
if ( sub_process )
httpd_clear_ndelay( hc->conn_fd );
/* Send the response, if necessary. */
if ( hc->responselen > 0 )
{
(void) httpd_write_fully( hc->conn_fd, hc->response, hc->responselen );
hc->responselen = 0;
}
}
/* Set no-delay / non-blocking mode on a socket. */
void
httpd_set_ndelay( int fd )
{
int flags, newflags;
flags = fcntl( fd, F_GETFL, 0 );
if ( flags != -1 )
{
newflags = flags | (int) O_NDELAY;
if ( newflags != flags )
(void) fcntl( fd, F_SETFL, newflags );
}
}
/* Clear no-delay / non-blocking mode on a socket. */
void
httpd_clear_ndelay( int fd )
{
int flags, newflags;
flags = fcntl( fd, F_GETFL, 0 );
if ( flags != -1 )
{
newflags = flags & ~ (int) O_NDELAY;
if ( newflags != flags )
(void) fcntl( fd, F_SETFL, newflags );
}
}
static void
send_mime( httpd_conn* hc, int status, char* title, char* encodings, char* extraheads, char* type, off_t length, time_t mod )
{
time_t now, expires;
const char* rfc1123fmt = "%a, %d %b %Y %H:%M:%S GMT";
char nowbuf[100];
char modbuf[100];
char expbuf[100];
char fixed_type[500];
char buf[1000];
int partial_content;
int s100;
hc->status = status;
hc->bytes_to_send = length;
if ( hc->mime_flag )
{
if ( status == 200 && hc->got_range &&
( hc->last_byte_index >= hc->first_byte_index ) &&
( ( hc->last_byte_index != length - 1 ) ||
( hc->first_byte_index != 0 ) ) &&
( hc->range_if == (time_t) -1 ||
hc->range_if == hc->sb.st_mtime ) )
{
partial_content = 1;
hc->status = status = 206;
title = ok206title;
}
else
{
partial_content = 0;
hc->got_range = 0;
}
now = time( (time_t*) 0 );
if ( mod == (time_t) 0 )
mod = now;
(void) strftime( nowbuf, sizeof(nowbuf), rfc1123fmt, gmtime( &now ) );
(void) strftime( modbuf, sizeof(modbuf), rfc1123fmt, gmtime( &mod ) );
(void) my_snprintf(
fixed_type, sizeof(fixed_type), type, hc->hs->charset );
(void) my_snprintf( buf, sizeof(buf),
"%.20s %d %s\015\012Server: %s\015\012Content-Type: %s\015\012Date: %s\015\012Last-Modified: %s\015\012Accept-Ranges: bytes\015\012Connection: close\015\012",
hc->protocol, status, title, EXPOSED_SERVER_SOFTWARE, fixed_type,
nowbuf, modbuf );
add_response( hc, buf );
s100 = status / 100;
if ( s100 != 2 && s100 != 3 )
{
(void) my_snprintf( buf, sizeof(buf),
"Cache-Control: no-cache,no-store\015\012" );
add_response( hc, buf );
}
if ( encodings[0] != '\0' )
{
(void) my_snprintf( buf, sizeof(buf),
"Content-Encoding: %s\015\012", encodings );
add_response( hc, buf );
}
if ( partial_content )
{
(void) my_snprintf( buf, sizeof(buf),
"Content-Range: bytes %lld-%lld/%lld\015\012Content-Length: %lld\015\012",
(long long) hc->first_byte_index,
(long long) hc->last_byte_index,
(long long) length,
(long long) ( hc->last_byte_index - hc->first_byte_index + 1 ) );
add_response( hc, buf );
}
else if ( length >= 0 )
{
(void) my_snprintf( buf, sizeof(buf),
"Content-Length: %lld\015\012", (long long) length );
add_response( hc, buf );
}
if ( hc->hs->p3p[0] != '\0' )
{
(void) my_snprintf( buf, sizeof(buf), "P3P: %s\015\012", hc->hs->p3p );
add_response( hc, buf );
}
if ( hc->hs->max_age >= 0 )
{
expires = now + hc->hs->max_age;
(void) strftime(
expbuf, sizeof(expbuf), rfc1123fmt, gmtime( &expires ) );
(void) my_snprintf( buf, sizeof(buf),
"Cache-Control: max-age=%d\015\012Expires: %s\015\012",
hc->hs->max_age, expbuf );
add_response( hc, buf );
}
if ( extraheads[0] != '\0' )
add_response( hc, extraheads );
add_response( hc, "\015\012" );
}
}
static int str_alloc_count = 0;
static size_t str_alloc_size = 0;
void
httpd_realloc_str( char** strP, size_t* maxsizeP, size_t size )
{
if ( *maxsizeP == 0 )
{
*maxsizeP = MAX( 200, size + 100 );
*strP = NEW( char, *maxsizeP + 1 );
++str_alloc_count;
str_alloc_size += *maxsizeP;
}
else if ( size > *maxsizeP )
{
str_alloc_size -= *maxsizeP;
*maxsizeP = MAX( *maxsizeP * 2, size * 5 / 4 );
*strP = RENEW( *strP, char, *maxsizeP + 1 );
str_alloc_size += *maxsizeP;
}
else
return;
if ( *strP == (char*) 0 )
{
syslog(
LOG_ERR, "out of memory reallocating a string to %ld bytes",
(long) *maxsizeP );
exit( 1 );
}
}
static void
send_response( httpd_conn* hc, int status, char* title, char* extraheads, char* form, char* arg )
{
char defanged_arg[1000], buf[2000];
send_mime(
hc, status, title, "", extraheads, "text/html; charset=%s", (off_t) -1,
(time_t) 0 );
(void) my_snprintf( buf, sizeof(buf), "\
<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">\n\
\n\
<html>\n\
\n\
<head>\n\
<meta http-equiv=\"Content-type\" content=\"text/html;charset=UTF-8\">\n\
<title>%d %s</title>\n\
</head>\n\
\n\
<body bgcolor=\"#cc9999\" text=\"#000000\" link=\"#2020ff\" vlink=\"#4040cc\">\n\
\n\
<h2>%d %s</h2>\n",
status, title, status, title );
add_response( hc, buf );
defang( arg, defanged_arg, sizeof(defanged_arg) );
(void) my_snprintf( buf, sizeof(buf), form, defanged_arg );
add_response( hc, buf );
if ( match( "**MSIE**", hc->useragent ) )
{
int n;
add_response( hc, "<!--\n" );
for ( n = 0; n < 6; ++n )
add_response( hc, "Padding so that MSIE deigns to show this error instead of its own canned one.\n");
add_response( hc, "-->\n" );
}
send_response_tail( hc );
}
static void
send_response_tail( httpd_conn* hc )
{
char buf[1000];
(void) my_snprintf( buf, sizeof(buf), "\
<hr>\n\
\n\
<address><a href=\"%s\">%s</a></address>\n\
\n\
</body>\n\
\n\
</html>\n",
SERVER_ADDRESS, EXPOSED_SERVER_SOFTWARE );
add_response( hc, buf );
}
static void
defang( char* str, char* dfstr, int dfsize )
{
char* cp1;
char* cp2;
for ( cp1 = str, cp2 = dfstr;
*cp1 != '\0' && cp2 - dfstr < dfsize - 5;
++cp1, ++cp2 )
{
switch ( *cp1 )
{
case '<':
*cp2++ = '&';
*cp2++ = 'l';
*cp2++ = 't';
*cp2 = ';';
break;
case '>':
*cp2++ = '&';
*cp2++ = 'g';
*cp2++ = 't';
*cp2 = ';';
break;
default:
*cp2 = *cp1;
break;
}
}
*cp2 = '\0';
}
void
httpd_send_err( httpd_conn* hc, int status, char* title, char* extraheads, char* form, char* arg )
{
#ifdef ERR_DIR
char filename[1000];
/* Try virtual host error page. */
if ( hc->hs->vhost && hc->hostdir[0] != '\0' )
{
(void) my_snprintf( filename, sizeof(filename),
"%s/%s/err%d.html", hc->hostdir, ERR_DIR, status );
if ( send_err_file( hc, status, title, extraheads, filename ) )
return;
}
/* Try server-wide error page. */
(void) my_snprintf( filename, sizeof(filename),
"%s/err%d.html", ERR_DIR, status );
if ( send_err_file( hc, status, title, extraheads, filename ) )
return;
/* Fall back on built-in error page. */
send_response( hc, status, title, extraheads, form, arg );
#else /* ERR_DIR */
send_response( hc, status, title, extraheads, form, arg );
#endif /* ERR_DIR */
}
#ifdef ERR_DIR
static int
send_err_file( httpd_conn* hc, int status, char* title, char* extraheads, char* filename )
{
FILE* fp;
char buf[1000];
size_t r;
fp = fopen( filename, "r" );
if ( fp == (FILE*) 0 )
return 0;
send_mime(
hc, status, title, "", extraheads, "text/html; charset=%s", (off_t) -1,
(time_t) 0 );
for (;;)
{
r = fread( buf, 1, sizeof(buf) - 1, fp );
if ( r == 0 )
break;
buf[r] = '\0';
add_response( hc, buf );
}
(void) fclose( fp );
#ifdef ERR_APPEND_SERVER_INFO
send_response_tail( hc );
#endif /* ERR_APPEND_SERVER_INFO */
return 1;
}
#endif /* ERR_DIR */
#ifdef AUTH_FILE
static void
send_authenticate( httpd_conn* hc, char* realm )
{
static char* header;
static size_t maxheader = 0;
static char headstr[] = "WWW-Authenticate: Basic realm=\"";
httpd_realloc_str(
&header, &maxheader, sizeof(headstr) + strlen( realm ) + 3 );
(void) my_snprintf( header, maxheader, "%s%s\"\015\012", headstr, realm );
httpd_send_err( hc, 401, err401title, header, err401form, hc->encodedurl );
/* If the request was a POST then there might still be data to be read,
** so we need to do a lingering close.
*/
if ( hc->method == METHOD_POST )
hc->should_linger = 1;
}
/* Base-64 decoding. This represents binary data as printable ASCII
** characters. Three 8-bit binary bytes are turned into four 6-bit
** values, like so:
**
** [11111111] [22222222] [33333333]
**
** [111111] [112222] [222233] [333333]
**
** Then the 6-bit values are represented using the characters "A-Za-z0-9+/".
*/
static int b64_decode_table[256] = {
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, /* 00-0F */
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, /* 10-1F */
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63, /* 20-2F */
52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1, /* 30-3F */
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14, /* 40-4F */
15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1, /* 50-5F */
-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40, /* 60-6F */
41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1, /* 70-7F */
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, /* 80-8F */
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, /* 90-9F */
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, /* A0-AF */
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, /* B0-BF */
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, /* C0-CF */
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, /* D0-DF */
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, /* E0-EF */
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1 /* F0-FF */
};
/* Do base-64 decoding on a string. Ignore any non-base64 bytes.
** Return the actual number of bytes generated. The decoded size will
** be at most 3/4 the size of the encoded, and may be smaller if there
** are padding characters (blanks, newlines).
*/
static int
b64_decode( const char* str, unsigned char* space, int size )
{
const char* cp;
int space_idx, phase;
int d, prev_d = 0;
unsigned char c;
space_idx = 0;
phase = 0;
for ( cp = str; *cp != '\0'; ++cp )
{
d = b64_decode_table[(int) ((unsigned char) *cp)];
if ( d != -1 )
{
switch ( phase )
{
case 0:
++phase;
break;
case 1:
c = ( ( prev_d << 2 ) | ( ( d & 0x30 ) >> 4 ) );
if ( space_idx < size )
space[space_idx++] = c;
++phase;
break;
case 2:
c = ( ( ( prev_d & 0xf ) << 4 ) | ( ( d & 0x3c ) >> 2 ) );
if ( space_idx < size )
space[space_idx++] = c;
++phase;
break;
case 3:
c = ( ( ( prev_d & 0x03 ) << 6 ) | d );
if ( space_idx < size )
space[space_idx++] = c;
phase = 0;
break;
}
prev_d = d;
}
}
return space_idx;
}
/* Returns -1 == unauthorized, 0 == no auth file, 1 = authorized. */
static int
auth_check( httpd_conn* hc, char* dirname )
{