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Import from upstream 2.29
2023-04-27 19:44:23 +00:00
/* libhttpd.c - HTTP protocol library
**
** Copyright <EFBFBD> 1995,1998,1999,2000,2001,2015 by
** Jef Poskanzer <jef@mail.acme.com>. 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 "thttpd"
#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 )
{
if ( hc->hs->global_passwd )
{
char* topdir;
if ( hc->hs->vhost && hc->hostdir[0] != '\0' )
topdir = hc->hostdir;
else
topdir = ".";
switch ( auth_check2( hc, topdir ) )
{
case -1:
return -1;
case 1:
return 1;
}
}
return auth_check2( hc, dirname );
}
/* Returns -1 == unauthorized, 0 == no auth file, 1 = authorized. */
static int
auth_check2( httpd_conn* hc, char* dirname )
{
static char* authpath;
static size_t maxauthpath = 0;
struct stat sb;
char authinfo[500];
char* authpass;
char* colon;
int l;
FILE* fp;
char line[500];
char* cryp;
static char* prevauthpath;
static size_t maxprevauthpath = 0;
static time_t prevmtime;
static char* prevuser;
static size_t maxprevuser = 0;
static char* prevcryp;
static size_t maxprevcryp = 0;
/* Construct auth filename. */
httpd_realloc_str(
&authpath, &maxauthpath, strlen( dirname ) + 1 + sizeof(AUTH_FILE) );
(void) my_snprintf( authpath, maxauthpath, "%s/%s", dirname, AUTH_FILE );
/* Does this directory have an auth file? */
if ( stat( authpath, &sb ) < 0 )
/* Nope, let the request go through. */
return 0;
/* Does this request contain basic authorization info? */
if ( hc->authorization[0] == '\0' ||
strncmp( hc->authorization, "Basic ", 6 ) != 0 )
{
/* Nope, return a 401 Unauthorized. */
send_authenticate( hc, dirname );
return -1;
}
/* Decode it. */
l = b64_decode(
&(hc->authorization[6]), (unsigned char*) authinfo,
sizeof(authinfo) - 1 );
authinfo[l] = '\0';
/* Split into user and password. */
authpass = strchr( authinfo, ':' );
if ( authpass == (char*) 0 )
{
/* No colon? Bogus auth info. */
send_authenticate( hc, dirname );
return -1;
}
*authpass++ = '\0';
/* If there are more fields, cut them off. */
colon = strchr( authpass, ':' );
if ( colon != (char*) 0 )
*colon = '\0';
/* See if we have a cached entry and can use it. */
if ( maxprevauthpath != 0 &&
strcmp( authpath, prevauthpath ) == 0 &&
sb.st_mtime == prevmtime &&
strcmp( authinfo, prevuser ) == 0 )
{
/* Yes. Check against the cached encrypted password. */
if ( strcmp( crypt( authpass, prevcryp ), prevcryp ) == 0 )
{
/* Ok! */
httpd_realloc_str(
&hc->remoteuser, &hc->maxremoteuser, strlen( authinfo ) );
(void) strcpy( hc->remoteuser, authinfo );
return 1;
}
else
{
/* No. */
send_authenticate( hc, dirname );
return -1;
}
}
/* Open the password file. */
fp = fopen( authpath, "r" );
if ( fp == (FILE*) 0 )
{
/* The file exists but we can't open it? Disallow access. */
syslog(
LOG_ERR, "%.80s auth file %.80s could not be opened - %m",
httpd_ntoa( &hc->client_addr ), authpath );
httpd_send_err(
hc, 403, err403title, "",
ERROR_FORM( err403form, "The requested URL '%.80s' is protected by an authentication file, but the authentication file cannot be opened.\n" ),
hc->encodedurl );
return -1;
}
/* Read it. */
while ( fgets( line, sizeof(line), fp ) != (char*) 0 )
{
/* Nuke newline. */
l = strlen( line );
if ( line[l - 1] == '\n' )
line[l - 1] = '\0';
/* Split into user and encrypted password. */
cryp = strchr( line, ':' );
if ( cryp == (char*) 0 )
continue;
*cryp++ = '\0';
/* Is this the right user? */
if ( strcmp( line, authinfo ) == 0 )
{
/* Yes. */
(void) fclose( fp );
/* So is the password right? */
if ( strcmp( crypt( authpass, cryp ), cryp ) == 0 )
{
/* Ok! */
httpd_realloc_str(
&hc->remoteuser, &hc->maxremoteuser, strlen( line ) );
(void) strcpy( hc->remoteuser, line );
/* And cache this user's info for next time. */
httpd_realloc_str(
&prevauthpath, &maxprevauthpath, strlen( authpath ) );
(void) strcpy( prevauthpath, authpath );
prevmtime = sb.st_mtime;
httpd_realloc_str(
&prevuser, &maxprevuser, strlen( authinfo ) );
(void) strcpy( prevuser, authinfo );
httpd_realloc_str( &prevcryp, &maxprevcryp, strlen( cryp ) );
(void) strcpy( prevcryp, cryp );
return 1;
}
else
{
/* No. */
send_authenticate( hc, dirname );
return -1;
}
}
}
/* Didn't find that user. Access denied. */
(void) fclose( fp );
send_authenticate( hc, dirname );
return -1;
}
#endif /* AUTH_FILE */
static void
send_dirredirect( httpd_conn* hc )
{
static char* location;
static char* header;
static size_t maxlocation = 0, maxheader = 0;
static char headstr[] = "Location: ";
if ( hc->query[0] != '\0')
{
char* cp = strchr( hc->encodedurl, '?' );
if ( cp != (char*) 0 ) /* should always find it */
*cp = '\0';
httpd_realloc_str(
&location, &maxlocation,
strlen( hc->encodedurl ) + 2 + strlen( hc->query ) );
(void) my_snprintf( location, maxlocation,
"%s/?%s", hc->encodedurl, hc->query );
}
else
{
httpd_realloc_str(
&location, &maxlocation, strlen( hc->encodedurl ) + 1 );
(void) my_snprintf( location, maxlocation,
"%s/", hc->encodedurl );
}
httpd_realloc_str(
&header, &maxheader, sizeof(headstr) + strlen( location ) );
(void) my_snprintf( header, maxheader,
"%s%s\015\012", headstr, location );
send_response( hc, 302, err302title, header, err302form, location );
}
char*
httpd_method_str( int method )
{
switch ( method )
{
case METHOD_GET: return "GET";
case METHOD_HEAD: return "HEAD";
case METHOD_POST: return "POST";
case METHOD_PUT: return "PUT";
case METHOD_DELETE: return "DELETE";
case METHOD_TRACE: return "TRACE";
default: return "UNKNOWN";
}
}
static int
hexit( char c )
{
if ( c >= '0' && c <= '9' )
return c - '0';
if ( c >= 'a' && c <= 'f' )
return c - 'a' + 10;
if ( c >= 'A' && c <= 'F' )
return c - 'A' + 10;
return 0; /* shouldn't happen, we're guarded by isxdigit() */
}
/* Copies and decodes a string. It's ok for from and to to be the
** same string.
*/
static void
strdecode( char* to, char* from )
{
for ( ; *from != '\0'; ++to, ++from )
{
if ( from[0] == '%' && isxdigit( from[1] ) && isxdigit( from[2] ) )
{
*to = hexit( from[1] ) * 16 + hexit( from[2] );
from += 2;
}
else
*to = *from;
}
*to = '\0';
}
#ifdef GENERATE_INDEXES
/* Copies and encodes a string. */
static void
strencode( char* to, int tosize, char* from )
{
int tolen;
for ( tolen = 0; *from != '\0' && tolen + 4 < tosize; ++from )
{
if ( isalnum(*from) || strchr( "/_.-~", *from ) != (char*) 0 )
{
*to = *from;
++to;
++tolen;
}
else
{
(void) sprintf( to, "%%%02x", (int) *from & 0xff );
to += 3;
tolen += 3;
}
}
*to = '\0';
}
#endif /* GENERATE_INDEXES */
#ifdef TILDE_MAP_1
/* Map a ~username/whatever URL into <prefix>/username. */
static int
tilde_map_1( httpd_conn* hc )
{
static char* temp;
static size_t maxtemp = 0;
int len;
static char* prefix = TILDE_MAP_1;
len = strlen( hc->expnfilename ) - 1;
httpd_realloc_str( &temp, &maxtemp, len );
(void) strcpy( temp, &hc->expnfilename[1] );
httpd_realloc_str(
&hc->expnfilename, &hc->maxexpnfilename, strlen( prefix ) + 1 + len );
(void) strcpy( hc->expnfilename, prefix );
if ( prefix[0] != '\0' )
(void) strcat( hc->expnfilename, "/" );
(void) strcat( hc->expnfilename, temp );
return 1;
}
#endif /* TILDE_MAP_1 */
#ifdef TILDE_MAP_2
/* Map a ~username/whatever URL into <user's homedir>/<postfix>. */
static int
tilde_map_2( httpd_conn* hc )
{
static char* temp;
static size_t maxtemp = 0;
static char* postfix = TILDE_MAP_2;
char* cp;
struct passwd* pw;
char* alt;
char* rest;
/* Get the username. */
httpd_realloc_str( &temp, &maxtemp, strlen( hc->expnfilename ) - 1 );
(void) strcpy( temp, &hc->expnfilename[1] );
cp = strchr( temp, '/' );
if ( cp != (char*) 0 )
*cp++ = '\0';
else
cp = "";
/* Get the passwd entry. */
pw = getpwnam( temp );
if ( pw == (struct passwd*) 0 )
return 0;
/* Set up altdir. */
httpd_realloc_str(
&hc->altdir, &hc->maxaltdir,
strlen( pw->pw_dir ) + 1 + strlen( postfix ) );
(void) strcpy( hc->altdir, pw->pw_dir );
if ( postfix[0] != '\0' )
{
(void) strcat( hc->altdir, "/" );
(void) strcat( hc->altdir, postfix );
}
alt = expand_symlinks( hc->altdir, &rest, 0, 1 );
if ( rest[0] != '\0' )
return 0;
httpd_realloc_str( &hc->altdir, &hc->maxaltdir, strlen( alt ) );
(void) strcpy( hc->altdir, alt );
/* And the filename becomes altdir plus the post-~ part of the original. */
httpd_realloc_str(
&hc->expnfilename, &hc->maxexpnfilename,
strlen( hc->altdir ) + 1 + strlen( cp ) );
(void) my_snprintf( hc->expnfilename, hc->maxexpnfilename,
"%s/%s", hc->altdir, cp );
/* For this type of tilde mapping, we want to defeat vhost mapping. */
hc->tildemapped = 1;
return 1;
}
#endif /* TILDE_MAP_2 */
/* Virtual host mapping. */
static int
vhost_map( httpd_conn* hc )
{
httpd_sockaddr sa;
socklen_t sz;
static char* tempfilename;
static size_t maxtempfilename = 0;
char* cp1;
int len;
#ifdef VHOST_DIRLEVELS
int i;
char* cp2;
#endif /* VHOST_DIRLEVELS */
/* Figure out the virtual hostname. */
if ( hc->reqhost[0] != '\0' )
hc->hostname = hc->reqhost;
else if ( hc->hdrhost[0] != '\0' )
hc->hostname = hc->hdrhost;
else
{
sz = sizeof(sa);
if ( getsockname( hc->conn_fd, &sa.sa, &sz ) < 0 )
{
syslog( LOG_ERR, "getsockname - %m" );
return 0;
}
hc->hostname = httpd_ntoa( &sa );
}
/* Pound it to lower case. */
for ( cp1 = hc->hostname; *cp1 != '\0'; ++cp1 )
if ( isupper( *cp1 ) )
*cp1 = tolower( *cp1 );
if ( hc->tildemapped )
return 1;
/* Figure out the host directory. */
#ifdef VHOST_DIRLEVELS
httpd_realloc_str(
&hc->hostdir, &hc->maxhostdir,
strlen( hc->hostname ) + 2 * VHOST_DIRLEVELS );
if ( strncmp( hc->hostname, "www.", 4 ) == 0 )
cp1 = &hc->hostname[4];
else
cp1 = hc->hostname;
for ( cp2 = hc->hostdir, i = 0; i < VHOST_DIRLEVELS; ++i )
{
/* Skip dots in the hostname. If we don't, then we get vhost
** directories in higher level of filestructure if dot gets
** involved into path construction. It's `while' used here instead
** of `if' for it's possible to have a hostname formed with two
** dots at the end of it.
*/
while ( *cp1 == '.' )
++cp1;
/* Copy a character from the hostname, or '_' if we ran out. */
if ( *cp1 != '\0' )
*cp2++ = *cp1++;
else
*cp2++ = '_';
/* Copy a slash. */
*cp2++ = '/';
}
(void) strcpy( cp2, hc->hostname );
#else /* VHOST_DIRLEVELS */
httpd_realloc_str( &hc->hostdir, &hc->maxhostdir, strlen( hc->hostname ) );
(void) strcpy( hc->hostdir, hc->hostname );
#endif /* VHOST_DIRLEVELS */
/* Prepend hostdir to the filename. */
len = strlen( hc->expnfilename );
httpd_realloc_str( &tempfilename, &maxtempfilename, len );
(void) strcpy( tempfilename, hc->expnfilename );
httpd_realloc_str(
&hc->expnfilename, &hc->maxexpnfilename,
strlen( hc->hostdir ) + 1 + len );
(void) strcpy( hc->expnfilename, hc->hostdir );
(void) strcat( hc->expnfilename, "/" );
(void) strcat( hc->expnfilename, tempfilename );
return 1;
}
/* Expands all symlinks in the given filename, eliding ..'s and leading /'s.
** Returns the expanded path (pointer to static string), or (char*) 0 on
** errors. Also returns, in the string pointed to by restP, any trailing
** parts of the path that don't exist.
**
** This is a fairly nice little routine. It handles any size filenames
** without excessive mallocs.
*/
static char*
expand_symlinks( char* path, char** restP, int no_symlink_check, int tildemapped )
{
static char* checked;
static char* rest;
char lnk[5000];
static size_t maxchecked = 0, maxrest = 0;
size_t checkedlen, restlen, linklen, prevcheckedlen, prevrestlen;
int nlinks, i;
char* r;
char* cp1;
char* cp2;
if ( no_symlink_check )
{
/* If we are chrooted, we can actually skip the symlink-expansion,
** since it's impossible to get out of the tree. However, we still
** need to do the pathinfo check, and the existing symlink expansion
** code is a pretty reasonable way to do this. So, what we do is
** a single stat() of the whole filename - if it exists, then we
** return it as is with nothing in restP. If it doesn't exist, we
** fall through to the existing code.
**
** One side-effect of this is that users can't symlink to central
** approved CGIs any more. The workaround is to use the central
** URL for the CGI instead of a local symlinked one.
*/
struct stat sb;
if ( stat( path, &sb ) != -1 )
{
checkedlen = strlen( path );
httpd_realloc_str( &checked, &maxchecked, checkedlen );
(void) strcpy( checked, path );
/* Trim trailing slashes. */
while ( checked[checkedlen - 1] == '/' )
{
checked[checkedlen - 1] = '\0';
--checkedlen;
}
httpd_realloc_str( &rest, &maxrest, 0 );
rest[0] = '\0';
*restP = rest;
return checked;
}
}
/* Start out with nothing in checked and the whole filename in rest. */
httpd_realloc_str( &checked, &maxchecked, 1 );
checked[0] = '\0';
checkedlen = 0;
restlen = strlen( path );
httpd_realloc_str( &rest, &maxrest, restlen );
(void) strcpy( rest, path );
if ( rest[restlen - 1] == '/' )
rest[--restlen] = '\0'; /* trim trailing slash */
if ( ! tildemapped )
/* Remove any leading slashes. */
while ( rest[0] == '/' )
{
(void) ol_strcpy( rest, &(rest[1]) );
--restlen;
}
r = rest;
nlinks = 0;
/* While there are still components to check... */
while ( restlen > 0 )
{
/* Save current checkedlen in case we get a symlink. Save current
** restlen in case we get a non-existant component.
*/
prevcheckedlen = checkedlen;
prevrestlen = restlen;
/* Grab one component from r and transfer it to checked. */
cp1 = strchr( r, '/' );
if ( cp1 != (char*) 0 )
{
i = cp1 - r;
if ( i == 0 )
{
/* Special case for absolute paths. */
httpd_realloc_str( &checked, &maxchecked, checkedlen + 1 );
(void) strncpy( &checked[checkedlen], r, 1 );
checkedlen += 1;
}
else if ( strncmp( r, "..", MAX( i, 2 ) ) == 0 )
{
/* Ignore ..'s that go above the start of the path. */
if ( checkedlen != 0 )
{
cp2 = strrchr( checked, '/' );
if ( cp2 == (char*) 0 )
checkedlen = 0;
else if ( cp2 == checked )
checkedlen = 1;
else
checkedlen = cp2 - checked;
}
}
else
{
httpd_realloc_str( &checked, &maxchecked, checkedlen + 1 + i );
if ( checkedlen > 0 && checked[checkedlen-1] != '/' )
checked[checkedlen++] = '/';
(void) strncpy( &checked[checkedlen], r, i );
checkedlen += i;
}
checked[checkedlen] = '\0';
r += i + 1;
restlen -= i + 1;
}
else
{
/* No slashes remaining, r is all one component. */
if ( strcmp( r, ".." ) == 0 )
{
/* Ignore ..'s that go above the start of the path. */
if ( checkedlen != 0 )
{
cp2 = strrchr( checked, '/' );
if ( cp2 == (char*) 0 )
checkedlen = 0;
else if ( cp2 == checked )
checkedlen = 1;
else
checkedlen = cp2 - checked;
checked[checkedlen] = '\0';
}
}
else
{
httpd_realloc_str(
&checked, &maxchecked, checkedlen + 1 + restlen );
if ( checkedlen > 0 && checked[checkedlen-1] != '/' )
checked[checkedlen++] = '/';
(void) strcpy( &checked[checkedlen], r );
checkedlen += restlen;
}
r += restlen;
restlen = 0;
}
/* Try reading the current filename as a symlink */
if ( checked[0] == '\0' )
continue;
linklen = readlink( checked, lnk, sizeof(lnk) - 1 );
if ( linklen == -1 )
{
if ( errno == EINVAL )
continue; /* not a symlink */
if ( errno == EACCES || errno == ENOENT || errno == ENOTDIR )
{
/* That last component was bogus. Restore and return. */
*restP = r - ( prevrestlen - restlen );
if ( prevcheckedlen == 0 )
(void) strcpy( checked, "." );
else
checked[prevcheckedlen] = '\0';
return checked;
}
syslog( LOG_ERR, "readlink %.80s - %m", checked );
return (char*) 0;
}
++nlinks;
if ( nlinks > MAX_LINKS )
{
syslog( LOG_ERR, "too many symlinks in %.80s", path );
return (char*) 0;
}
lnk[linklen] = '\0';
if ( lnk[linklen - 1] == '/' )
lnk[--linklen] = '\0'; /* trim trailing slash */
/* Insert the link contents in front of the rest of the filename. */
if ( restlen != 0 )
{
(void) ol_strcpy( rest, r );
httpd_realloc_str( &rest, &maxrest, restlen + linklen + 1 );
for ( i = restlen; i >= 0; --i )
rest[i + linklen + 1] = rest[i];
(void) strcpy( rest, lnk );
rest[linklen] = '/';
restlen += linklen + 1;
r = rest;
}
else
{
/* There's nothing left in the filename, so the link contents
** becomes the rest.
*/
httpd_realloc_str( &rest, &maxrest, linklen );
(void) strcpy( rest, lnk );
restlen = linklen;
r = rest;
}
if ( rest[0] == '/' )
{
/* There must have been an absolute symlink - zero out checked. */
checked[0] = '\0';
checkedlen = 0;
}
else
{
/* Re-check this component. */
checkedlen = prevcheckedlen;
checked[checkedlen] = '\0';
}
}
/* Ok. */
*restP = r;
if ( checked[0] == '\0' )
(void) strcpy( checked, "." );
return checked;
}
int
httpd_get_conn( httpd_server* hs, int listen_fd, httpd_conn* hc )
{
httpd_sockaddr sa;
socklen_t sz;
if ( ! hc->initialized )
{
hc->read_size = 0;
httpd_realloc_str( &hc->read_buf, &hc->read_size, 500 );
hc->maxdecodedurl =
hc->maxorigfilename = hc->maxexpnfilename = hc->maxencodings =
hc->maxpathinfo = hc->maxquery = hc->maxaccept =
hc->maxaccepte = hc->maxreqhost = hc->maxhostdir =
hc->maxremoteuser = hc->maxresponse = 0;
#ifdef TILDE_MAP_2
hc->maxaltdir = 0;
#endif /* TILDE_MAP_2 */
httpd_realloc_str( &hc->decodedurl, &hc->maxdecodedurl, 1 );
httpd_realloc_str( &hc->origfilename, &hc->maxorigfilename, 1 );
httpd_realloc_str( &hc->expnfilename, &hc->maxexpnfilename, 0 );
httpd_realloc_str( &hc->encodings, &hc->maxencodings, 0 );
httpd_realloc_str( &hc->pathinfo, &hc->maxpathinfo, 0 );
httpd_realloc_str( &hc->query, &hc->maxquery, 0 );
httpd_realloc_str( &hc->accept, &hc->maxaccept, 0 );
httpd_realloc_str( &hc->accepte, &hc->maxaccepte, 0 );
httpd_realloc_str( &hc->reqhost, &hc->maxreqhost, 0 );
httpd_realloc_str( &hc->hostdir, &hc->maxhostdir, 0 );
httpd_realloc_str( &hc->remoteuser, &hc->maxremoteuser, 0 );
httpd_realloc_str( &hc->response, &hc->maxresponse, 0 );
#ifdef TILDE_MAP_2
httpd_realloc_str( &hc->altdir, &hc->maxaltdir, 0 );
#endif /* TILDE_MAP_2 */
hc->initialized = 1;
}
/* Accept the new connection. */
sz = sizeof(sa);
hc->conn_fd = accept( listen_fd, &sa.sa, &sz );
if ( hc->conn_fd < 0 )
{
if ( errno == EWOULDBLOCK )
return GC_NO_MORE;
/* ECONNABORTED means the connection was closed by the client while
** it was waiting in the listen queue. It's not worth logging.
*/
if ( errno != ECONNABORTED )
syslog( LOG_ERR, "accept - %m" );
return GC_FAIL;
}
if ( ! sockaddr_check( &sa ) )
{
syslog( LOG_ERR, "unknown sockaddr family" );
close( hc->conn_fd );
hc->conn_fd = -1;
return GC_FAIL;
}
(void) fcntl( hc->conn_fd, F_SETFD, 1 );
hc->hs = hs;
(void) memset( &hc->client_addr, 0, sizeof(hc->client_addr) );
(void) memmove( &hc->client_addr, &sa, sockaddr_len( &sa ) );
hc->read_idx = 0;
hc->checked_idx = 0;
hc->checked_state = CHST_FIRSTWORD;
hc->method = METHOD_UNKNOWN;
hc->status = 0;
hc->bytes_to_send = 0;
hc->bytes_sent = 0;
hc->encodedurl = "";
hc->decodedurl[0] = '\0';
hc->protocol = "UNKNOWN";
hc->origfilename[0] = '\0';
hc->expnfilename[0] = '\0';
hc->encodings[0] = '\0';
hc->pathinfo[0] = '\0';
hc->query[0] = '\0';
hc->referrer = "";
hc->useragent = "";
hc->accept[0] = '\0';
hc->accepte[0] = '\0';
hc->acceptl = "";
hc->cookie = "";
hc->contenttype = "";
hc->reqhost[0] = '\0';
hc->hdrhost = "";
hc->hostdir[0] = '\0';
hc->authorization = "";
hc->remoteuser[0] = '\0';
hc->response[0] = '\0';
#ifdef TILDE_MAP_2
hc->altdir[0] = '\0';
#endif /* TILDE_MAP_2 */
hc->responselen = 0;
hc->if_modified_since = (time_t) -1;
hc->range_if = (time_t) -1;
hc->contentlength = -1;
hc->type = "";
hc->hostname = (char*) 0;
hc->mime_flag = 1;
hc->one_one = 0;
hc->got_range = 0;
hc->tildemapped = 0;
hc->first_byte_index = 0;
hc->last_byte_index = -1;
hc->keep_alive = 0;
hc->should_linger = 0;
hc->file_address = (char*) 0;
return GC_OK;
}
/* Checks hc->read_buf to see whether a complete request has been read so far;
** either the first line has two words (an HTTP/0.9 request), or the first
** line has three words and there's a blank line present.
**
** hc->read_idx is how much has been read in; hc->checked_idx is how much we
** have checked so far; and hc->checked_state is the current state of the
** finite state machine.
*/
int
httpd_got_request( httpd_conn* hc )
{
char c;
for ( ; hc->checked_idx < hc->read_idx; ++hc->checked_idx )
{
c = hc->read_buf[hc->checked_idx];
switch ( hc->checked_state )
{
case CHST_FIRSTWORD:
switch ( c )
{
case ' ': case '\t':
hc->checked_state = CHST_FIRSTWS;
break;
case '\012': case '\015':
hc->checked_state = CHST_BOGUS;
return GR_BAD_REQUEST;
}
break;
case CHST_FIRSTWS:
switch ( c )
{
case ' ': case '\t':
break;
case '\012': case '\015':
hc->checked_state = CHST_BOGUS;
return GR_BAD_REQUEST;
default:
hc->checked_state = CHST_SECONDWORD;
break;
}
break;
case CHST_SECONDWORD:
switch ( c )
{
case ' ': case '\t':
hc->checked_state = CHST_SECONDWS;
break;
case '\012': case '\015':
/* The first line has only two words - an HTTP/0.9 request. */
return GR_GOT_REQUEST;
}
break;
case CHST_SECONDWS:
switch ( c )
{
case ' ': case '\t':
break;
case '\012': case '\015':
hc->checked_state = CHST_BOGUS;
return GR_BAD_REQUEST;
default:
hc->checked_state = CHST_THIRDWORD;
break;
}
break;
case CHST_THIRDWORD:
switch ( c )
{
case ' ': case '\t':
hc->checked_state = CHST_THIRDWS;
break;
case '\012':
hc->checked_state = CHST_LF;
break;
case '\015':
hc->checked_state = CHST_CR;
break;
}
break;
case CHST_THIRDWS:
switch ( c )
{
case ' ': case '\t':
break;
case '\012':
hc->checked_state = CHST_LF;
break;
case '\015':
hc->checked_state = CHST_CR;
break;
default:
hc->checked_state = CHST_BOGUS;
return GR_BAD_REQUEST;
}
break;
case CHST_LINE:
switch ( c )
{
case '\012':
hc->checked_state = CHST_LF;
break;
case '\015':
hc->checked_state = CHST_CR;
break;
}
break;
case CHST_LF:
switch ( c )
{
case '\012':
/* Two newlines in a row - a blank line - end of request. */
return GR_GOT_REQUEST;
case '\015':
hc->checked_state = CHST_CR;
break;
default:
hc->checked_state = CHST_LINE;
break;
}
break;
case CHST_CR:
switch ( c )
{
case '\012':
hc->checked_state = CHST_CRLF;
break;
case '\015':
/* Two returns in a row - end of request. */
return GR_GOT_REQUEST;
default:
hc->checked_state = CHST_LINE;
break;
}
break;
case CHST_CRLF:
switch ( c )
{
case '\012':
/* Two newlines in a row - end of request. */
return GR_GOT_REQUEST;
case '\015':
hc->checked_state = CHST_CRLFCR;
break;
default:
hc->checked_state = CHST_LINE;
break;
}
break;
case CHST_CRLFCR:
switch ( c )
{
case '\012': case '\015':
/* Two CRLFs or two CRs in a row - end of request. */
return GR_GOT_REQUEST;
default:
hc->checked_state = CHST_LINE;
break;
}
break;
case CHST_BOGUS:
return GR_BAD_REQUEST;
}
}
return GR_NO_REQUEST;
}
int
httpd_parse_request( httpd_conn* hc )
{
char* buf;
char* method_str;
char* url;
char* protocol;
char* reqhost;
char* eol;
char* cp;
char* pi;
hc->checked_idx = 0; /* reset */
method_str = bufgets( hc );
url = strpbrk( method_str, " \t\012\015" );
if ( url == (char*) 0 )
{
httpd_send_err( hc, 400, httpd_err400title, "", httpd_err400form, "" );
return -1;
}
*url++ = '\0';
url += strspn( url, " \t\012\015" );
protocol = strpbrk( url, " \t\012\015" );
if ( protocol == (char*) 0 )
{
protocol = "HTTP/0.9";
hc->mime_flag = 0;
}
else
{
*protocol++ = '\0';
protocol += strspn( protocol, " \t\012\015" );
if ( *protocol != '\0' )
{
eol = strpbrk( protocol, " \t\012\015" );
if ( eol != (char*) 0 )
*eol = '\0';
if ( strcasecmp( protocol, "HTTP/1.0" ) != 0 )
hc->one_one = 1;
}
}
hc->protocol = protocol;
/* Check for HTTP/1.1 absolute URL. */
if ( strncasecmp( url, "http://", 7 ) == 0 )
{
if ( ! hc->one_one )
{
httpd_send_err( hc, 400, httpd_err400title, "", httpd_err400form, "" );
return -1;
}
reqhost = url + 7;
url = strchr( reqhost, '/' );
if ( url == (char*) 0 )
{
httpd_send_err( hc, 400, httpd_err400title, "", httpd_err400form, "" );
return -1;
}
*url = '\0';
if ( strchr( reqhost, '/' ) != (char*) 0 || reqhost[0] == '.' )
{
httpd_send_err( hc, 400, httpd_err400title, "", httpd_err400form, "" );
return -1;
}
httpd_realloc_str( &hc->reqhost, &hc->maxreqhost, strlen( reqhost ) );
(void) strcpy( hc->reqhost, reqhost );
*url = '/';
}
if ( *url != '/' )
{
httpd_send_err( hc, 400, httpd_err400title, "", httpd_err400form, "" );
return -1;
}
if ( strcasecmp( method_str, httpd_method_str( METHOD_GET ) ) == 0 )
hc->method = METHOD_GET;
else if ( strcasecmp( method_str, httpd_method_str( METHOD_HEAD ) ) == 0 )
hc->method = METHOD_HEAD;
else if ( strcasecmp( method_str, httpd_method_str( METHOD_POST ) ) == 0 )
hc->method = METHOD_POST;
else if ( strcasecmp( method_str, httpd_method_str( METHOD_PUT ) ) == 0 )
hc->method = METHOD_PUT;
else if ( strcasecmp( method_str, httpd_method_str( METHOD_DELETE ) ) == 0 )
hc->method = METHOD_DELETE;
else if ( strcasecmp( method_str, httpd_method_str( METHOD_TRACE ) ) == 0 )
hc->method = METHOD_TRACE;
else
{
httpd_send_err( hc, 501, err501title, "", err501form, method_str );
return -1;
}
hc->encodedurl = url;
httpd_realloc_str(
&hc->decodedurl, &hc->maxdecodedurl, strlen( hc->encodedurl ) );
strdecode( hc->decodedurl, hc->encodedurl );
httpd_realloc_str(
&hc->origfilename, &hc->maxorigfilename, strlen( hc->decodedurl ) );
(void) strcpy( hc->origfilename, &hc->decodedurl[1] );
/* Special case for top-level URL. */
if ( hc->origfilename[0] == '\0' )
(void) strcpy( hc->origfilename, "." );
/* Extract query string from encoded URL. */
cp = strchr( hc->encodedurl, '?' );
if ( cp != (char*) 0 )
{
++cp;
httpd_realloc_str( &hc->query, &hc->maxquery, strlen( cp ) );
(void) strcpy( hc->query, cp );
/* Remove query from (decoded) origfilename. */
cp = strchr( hc->origfilename, '?' );
if ( cp != (char*) 0 )
*cp = '\0';
}
de_dotdot( hc->origfilename );
if ( hc->origfilename[0] == '/' ||
( hc->origfilename[0] == '.' && hc->origfilename[1] == '.' &&
( hc->origfilename[2] == '\0' || hc->origfilename[2] == '/' ) ) )
{
httpd_send_err( hc, 400, httpd_err400title, "", httpd_err400form, "" );
return -1;
}
if ( hc->mime_flag )
{
/* Read the MIME headers. */
while ( ( buf = bufgets( hc ) ) != (char*) 0 )
{
if ( buf[0] == '\0' )
break;
if ( strncasecmp( buf, "Referer:", 8 ) == 0 )
{
cp = &buf[8];
cp += strspn( cp, " \t" );
hc->referrer = cp;
}
else if ( strncasecmp( buf, "Referrer:", 9 ) == 0 )
{
cp = &buf[9];
cp += strspn( cp, " \t" );
hc->referrer = cp;
}
else if ( strncasecmp( buf, "User-Agent:", 11 ) == 0 )
{
cp = &buf[11];
cp += strspn( cp, " \t" );
hc->useragent = cp;
}
else if ( strncasecmp( buf, "Host:", 5 ) == 0 )
{
cp = &buf[5];
cp += strspn( cp, " \t" );
hc->hdrhost = cp;
cp = strchr( hc->hdrhost, ':' );
if ( cp != (char*) 0 )
*cp = '\0';
if ( strchr( hc->hdrhost, '/' ) != (char*) 0 || hc->hdrhost[0] == '.' )
{
httpd_send_err( hc, 400, httpd_err400title, "", httpd_err400form, "" );
return -1;
}
}
else if ( strncasecmp( buf, "Accept:", 7 ) == 0 )
{
cp = &buf[7];
cp += strspn( cp, " \t" );
if ( hc->accept[0] != '\0' )
{
if ( strlen( hc->accept ) > 5000 )
{
syslog(
LOG_ERR, "%.80s way too much Accept: data",
httpd_ntoa( &hc->client_addr ) );
continue;
}
httpd_realloc_str(
&hc->accept, &hc->maxaccept,
strlen( hc->accept ) + 2 + strlen( cp ) );
(void) strcat( hc->accept, ", " );
}
else
httpd_realloc_str(
&hc->accept, &hc->maxaccept, strlen( cp ) );
(void) strcat( hc->accept, cp );
}
else if ( strncasecmp( buf, "Accept-Encoding:", 16 ) == 0 )
{
cp = &buf[16];
cp += strspn( cp, " \t" );
if ( hc->accepte[0] != '\0' )
{
if ( strlen( hc->accepte ) > 5000 )
{
syslog(
LOG_ERR, "%.80s way too much Accept-Encoding: data",
httpd_ntoa( &hc->client_addr ) );
continue;
}
httpd_realloc_str(
&hc->accepte, &hc->maxaccepte,
strlen( hc->accepte ) + 2 + strlen( cp ) );
(void) strcat( hc->accepte, ", " );
}
else
httpd_realloc_str(
&hc->accepte, &hc->maxaccepte, strlen( cp ) );
(void) strcpy( hc->accepte, cp );
}
else if ( strncasecmp( buf, "Accept-Language:", 16 ) == 0 )
{
cp = &buf[16];
cp += strspn( cp, " \t" );
hc->acceptl = cp;
}
else if ( strncasecmp( buf, "If-Modified-Since:", 18 ) == 0 )
{
cp = &buf[18];
hc->if_modified_since = tdate_parse( cp );
if ( hc->if_modified_since == (time_t) -1 )
syslog( LOG_DEBUG, "unparsable time: %.80s", cp );
}
else if ( strncasecmp( buf, "Cookie:", 7 ) == 0 )
{
cp = &buf[7];
cp += strspn( cp, " \t" );
hc->cookie = cp;
}
else if ( strncasecmp( buf, "Range:", 6 ) == 0 )
{
/* Only support %d- and %d-%d, not %d-%d,%d-%d or -%d. */
if ( strchr( buf, ',' ) == (char*) 0 )
{
char* cp_dash;
cp = strpbrk( buf, "=" );
if ( cp != (char*) 0 )
{
cp_dash = strchr( cp + 1, '-' );
if ( cp_dash != (char*) 0 && cp_dash != cp + 1 )
{
*cp_dash = '\0';
hc->got_range = 1;
hc->first_byte_index = atoll( cp + 1 );
if ( hc->first_byte_index < 0 )
hc->first_byte_index = 0;
if ( isdigit( (int) cp_dash[1] ) )
{
hc->last_byte_index = atoll( cp_dash + 1 );
if ( hc->last_byte_index < 0 )
hc->last_byte_index = -1;
}
}
}
}
}
else if ( strncasecmp( buf, "Range-If:", 9 ) == 0 ||
strncasecmp( buf, "If-Range:", 9 ) == 0 )
{
cp = &buf[9];
hc->range_if = tdate_parse( cp );
if ( hc->range_if == (time_t) -1 )
syslog( LOG_DEBUG, "unparsable time: %.80s", cp );
}
else if ( strncasecmp( buf, "Content-Type:", 13 ) == 0 )
{
cp = &buf[13];
cp += strspn( cp, " \t" );
hc->contenttype = cp;
}
else if ( strncasecmp( buf, "Content-Length:", 15 ) == 0 )
{
cp = &buf[15];
hc->contentlength = atol( cp );
}
else if ( strncasecmp( buf, "Authorization:", 14 ) == 0 )
{
cp = &buf[14];
cp += strspn( cp, " \t" );
hc->authorization = cp;
}
else if ( strncasecmp( buf, "Connection:", 11 ) == 0 )
{
cp = &buf[11];
cp += strspn( cp, " \t" );
if ( strcasecmp( cp, "keep-alive" ) == 0 )
hc->keep_alive = 1;
}
#ifdef LOG_UNKNOWN_HEADERS
else if ( strncasecmp( buf, "Accept-Charset:", 15 ) == 0 ||
strncasecmp( buf, "Accept-Language:", 16 ) == 0 ||
strncasecmp( buf, "Agent:", 6 ) == 0 ||
strncasecmp( buf, "Cache-Control:", 14 ) == 0 ||
strncasecmp( buf, "Cache-Info:", 11 ) == 0 ||
strncasecmp( buf, "Charge-To:", 10 ) == 0 ||
strncasecmp( buf, "Client-IP:", 10 ) == 0 ||
strncasecmp( buf, "Date:", 5 ) == 0 ||
strncasecmp( buf, "Extension:", 10 ) == 0 ||
strncasecmp( buf, "Forwarded:", 10 ) == 0 ||
strncasecmp( buf, "From:", 5 ) == 0 ||
strncasecmp( buf, "HTTP-Version:", 13 ) == 0 ||
strncasecmp( buf, "Max-Forwards:", 13 ) == 0 ||
strncasecmp( buf, "Message-Id:", 11 ) == 0 ||
strncasecmp( buf, "MIME-Version:", 13 ) == 0 ||
strncasecmp( buf, "Negotiate:", 10 ) == 0 ||
strncasecmp( buf, "Pragma:", 7 ) == 0 ||
strncasecmp( buf, "Proxy-Agent:", 12 ) == 0 ||
strncasecmp( buf, "Proxy-Connection:", 17 ) == 0 ||
strncasecmp( buf, "Security-Scheme:", 16 ) == 0 ||
strncasecmp( buf, "Session-Id:", 11 ) == 0 ||
strncasecmp( buf, "UA-Color:", 9 ) == 0 ||
strncasecmp( buf, "UA-CPU:", 7 ) == 0 ||
strncasecmp( buf, "UA-Disp:", 8 ) == 0 ||
strncasecmp( buf, "UA-OS:", 6 ) == 0 ||
strncasecmp( buf, "UA-Pixels:", 10 ) == 0 ||
strncasecmp( buf, "User:", 5 ) == 0 ||
strncasecmp( buf, "Via:", 4 ) == 0 ||
strncasecmp( buf, "X-", 2 ) == 0 )
; /* ignore */
else
syslog( LOG_DEBUG, "unknown request header: %.80s", buf );
#endif /* LOG_UNKNOWN_HEADERS */
}
}
if ( hc->one_one )
{
/* Check that HTTP/1.1 requests specify a host, as required. */
if ( hc->reqhost[0] == '\0' && hc->hdrhost[0] == '\0' )
{
httpd_send_err( hc, 400, httpd_err400title, "", httpd_err400form, "" );
return -1;
}
/* If the client wants to do keep-alives, it might also be doing
** pipelining. There's no way for us to tell. Since we don't
** implement keep-alives yet, if we close such a connection there
** might be unread pipelined requests waiting. So, we have to
** do a lingering close.
*/
if ( hc->keep_alive )
hc->should_linger = 1;
}
/* Ok, the request has been parsed. Now we resolve stuff that
** may require the entire request.
*/
/* Copy original filename to expanded filename. */
httpd_realloc_str(
&hc->expnfilename, &hc->maxexpnfilename, strlen( hc->origfilename ) );
(void) strcpy( hc->expnfilename, hc->origfilename );
/* Tilde mapping. */
if ( hc->expnfilename[0] == '~' )
{
#ifdef TILDE_MAP_1
if ( ! tilde_map_1( hc ) )
{
httpd_send_err( hc, 404, err404title, "", err404form, hc->encodedurl );
return -1;
}
#endif /* TILDE_MAP_1 */
#ifdef TILDE_MAP_2
if ( ! tilde_map_2( hc ) )
{
httpd_send_err( hc, 404, err404title, "", err404form, hc->encodedurl );
return -1;
}
#endif /* TILDE_MAP_2 */
}
/* Virtual host mapping. */
if ( hc->hs->vhost )
if ( ! vhost_map( hc ) )
{
httpd_send_err( hc, 500, err500title, "", err500form, hc->encodedurl );
return -1;
}
/* Expand all symbolic links in the filename. This also gives us
** any trailing non-existing components, for pathinfo.
*/
cp = expand_symlinks( hc->expnfilename, &pi, hc->hs->no_symlink_check, hc->tildemapped );
if ( cp == (char*) 0 )
{
httpd_send_err( hc, 500, err500title, "", err500form, hc->encodedurl );
return -1;
}
httpd_realloc_str( &hc->expnfilename, &hc->maxexpnfilename, strlen( cp ) );
(void) strcpy( hc->expnfilename, cp );
httpd_realloc_str( &hc->pathinfo, &hc->maxpathinfo, strlen( pi ) );
(void) strcpy( hc->pathinfo, pi );
/* Remove pathinfo stuff from the original filename too. */
if ( hc->pathinfo[0] != '\0' )
{
int i;
i = strlen( hc->origfilename ) - strlen( hc->pathinfo );
if ( i > 0 && strcmp( &hc->origfilename[i], hc->pathinfo ) == 0 )
hc->origfilename[i - 1] = '\0';
}
/* If the expanded filename is an absolute path, check that it's still
** within the current directory or the alternate directory.
*/
if ( hc->expnfilename[0] == '/' )
{
if ( strncmp(
hc->expnfilename, hc->hs->cwd, strlen( hc->hs->cwd ) ) == 0 )
{
/* Elide the current directory. */
(void) ol_strcpy(
hc->expnfilename, &hc->expnfilename[strlen( hc->hs->cwd )] );
}
#ifdef TILDE_MAP_2
else if ( hc->altdir[0] != '\0' &&
( strncmp(
hc->expnfilename, hc->altdir,
strlen( hc->altdir ) ) == 0 &&
( hc->expnfilename[strlen( hc->altdir )] == '\0' ||
hc->expnfilename[strlen( hc->altdir )] == '/' ) ) )
{}
#endif /* TILDE_MAP_2 */
else
{
syslog(
LOG_NOTICE, "%.80s URL \"%.80s\" goes outside the web tree",
httpd_ntoa( &hc->client_addr ), hc->encodedurl );
httpd_send_err(
hc, 403, err403title, "",
ERROR_FORM( err403form, "The requested URL '%.80s' resolves to a file outside the permitted web server directory tree.\n" ),
hc->encodedurl );
return -1;
}
}
return 0;
}
static char*
bufgets( httpd_conn* hc )
{
int i;
char c;
for ( i = hc->checked_idx; hc->checked_idx < hc->read_idx; ++hc->checked_idx )
{
c = hc->read_buf[hc->checked_idx];
if ( c == '\012' || c == '\015' )
{
hc->read_buf[hc->checked_idx] = '\0';
++hc->checked_idx;
if ( c == '\015' && hc->checked_idx < hc->read_idx &&
hc->read_buf[hc->checked_idx] == '\012' )
{
hc->read_buf[hc->checked_idx] = '\0';
++hc->checked_idx;
}
return &(hc->read_buf[i]);
}
}
return (char*) 0;
}
static void
de_dotdot( char* file )
{
char* cp;
char* cp2;
int l;
/* Collapse any multiple / sequences. */
while ( ( cp = strstr( file, "//") ) != (char*) 0 )
{
for ( cp2 = cp + 2; *cp2 == '/'; ++cp2 )
continue;
(void) ol_strcpy( cp + 1, cp2 );
}
/* Remove leading ./ and any /./ sequences. */
while ( strncmp( file, "./", 2 ) == 0 )
(void) ol_strcpy( file, file + 2 );
while ( ( cp = strstr( file, "/./") ) != (char*) 0 )
(void) ol_strcpy( cp, cp + 2 );
/* Alternate between removing leading ../ and removing xxx/../ */
for (;;)
{
while ( strncmp( file, "../", 3 ) == 0 )
(void) ol_strcpy( file, file + 3 );
cp = strstr( file, "/../" );
if ( cp == (char*) 0 )
break;
for ( cp2 = cp - 1; cp2 >= file && *cp2 != '/'; --cp2 )
continue;
(void) ol_strcpy( cp2 + 1, cp + 4 );
}
/* Also elide any xxx/.. at the end. */
while ( ( l = strlen( file ) ) > 3 &&
strcmp( ( cp = file + l - 3 ), "/.." ) == 0 )
{
for ( cp2 = cp - 1; cp2 >= file && *cp2 != '/'; --cp2 )
continue;
if ( cp2 < file )
break;
*cp2 = '\0';
}
}
void
httpd_close_conn( httpd_conn* hc, struct timeval* nowP )
{
make_log_entry( hc, nowP );
if ( hc->file_address != (char*) 0 )
{
mmc_unmap( hc->file_address, &(hc->sb), nowP );
hc->file_address = (char*) 0;
}
if ( hc->conn_fd >= 0 )
{
(void) close( hc->conn_fd );
hc->conn_fd = -1;
}
}
void
httpd_destroy_conn( httpd_conn* hc )
{
if ( hc->initialized )
{
free( (void*) hc->read_buf );
free( (void*) hc->decodedurl );
free( (void*) hc->origfilename );
free( (void*) hc->expnfilename );
free( (void*) hc->encodings );
free( (void*) hc->pathinfo );
free( (void*) hc->query );
free( (void*) hc->accept );
free( (void*) hc->accepte );
free( (void*) hc->reqhost );
free( (void*) hc->hostdir );
free( (void*) hc->remoteuser );
free( (void*) hc->response );
#ifdef TILDE_MAP_2
free( (void*) hc->altdir );
#endif /* TILDE_MAP_2 */
hc->initialized = 0;
}
}
struct mime_entry {
char* ext;
size_t ext_len;
char* val;
size_t val_len;
};
static struct mime_entry enc_tab[] = {
#include "mime_encodings.h"
};
static const int n_enc_tab = sizeof(enc_tab) / sizeof(*enc_tab);
static struct mime_entry typ_tab[] = {
#include "mime_types.h"
};
static const int n_typ_tab = sizeof(typ_tab) / sizeof(*typ_tab);
/* qsort comparison routine */
static int
ext_compare( const void* v1, const void* v2 )
{
const struct mime_entry* m1 = (const struct mime_entry*) v1;
const struct mime_entry* m2 = (const struct mime_entry*) v2;
return strcmp( m1->ext, m2->ext );
}
static void
init_mime( void )
{
int i;
/* Sort the tables so we can do binary search. */
qsort( enc_tab, n_enc_tab, sizeof(*enc_tab), ext_compare );
qsort( typ_tab, n_typ_tab, sizeof(*typ_tab), ext_compare );
/* Fill in the lengths. */
for ( i = 0; i < n_enc_tab; ++i )
{
enc_tab[i].ext_len = strlen( enc_tab[i].ext );
enc_tab[i].val_len = strlen( enc_tab[i].val );
}
for ( i = 0; i < n_typ_tab; ++i )
{
typ_tab[i].ext_len = strlen( typ_tab[i].ext );
typ_tab[i].val_len = strlen( typ_tab[i].val );
}
}
/* Figure out MIME encodings and type based on the filename. Multiple
** encodings are separated by commas, and are listed in the order in
** which they were applied to the file.
*/
static void
figure_mime( httpd_conn* hc )
{
char* prev_dot;
char* dot;
char* ext;
int me_indexes[100], n_me_indexes;
size_t ext_len, encodings_len;
int i, top, bot, mid;
int r;
char* default_type = "text/plain; charset=%s";
/* Peel off encoding extensions until there aren't any more. */
n_me_indexes = 0;
for ( prev_dot = &hc->expnfilename[strlen(hc->expnfilename)]; ; prev_dot = dot )
{
for ( dot = prev_dot - 1; dot >= hc->expnfilename && *dot != '.'; --dot )
;
if ( dot < hc->expnfilename )
{
/* No dot found. No more encoding extensions, and no type
** extension either.
*/
hc->type = default_type;
goto done;
}
ext = dot + 1;
ext_len = prev_dot - ext;
/* Search the encodings table. Linear search is fine here, there
** are only a few entries.
*/
for ( i = 0; i < n_enc_tab; ++i )
{
if ( ext_len == enc_tab[i].ext_len && strncasecmp( ext, enc_tab[i].ext, ext_len ) == 0 )
{
if ( n_me_indexes < sizeof(me_indexes)/sizeof(*me_indexes) )
{
me_indexes[n_me_indexes] = i;
++n_me_indexes;
}
goto next;
}
}
/* No encoding extension found. Break and look for a type extension. */
break;
next: ;
}
/* Binary search for a matching type extension. */
top = n_typ_tab - 1;
bot = 0;
while ( top >= bot )
{
mid = ( top + bot ) / 2;
r = strncasecmp( ext, typ_tab[mid].ext, ext_len );
if ( r < 0 )
top = mid - 1;
else if ( r > 0 )
bot = mid + 1;
else
if ( ext_len < typ_tab[mid].ext_len )
top = mid - 1;
else if ( ext_len > typ_tab[mid].ext_len )
bot = mid + 1;
else
{
hc->type = typ_tab[mid].val;
goto done;
}
}
hc->type = default_type;
done:
/* The last thing we do is actually generate the mime-encoding header. */
hc->encodings[0] = '\0';
encodings_len = 0;
for ( i = n_me_indexes - 1; i >= 0; --i )
{
httpd_realloc_str(
&hc->encodings, &hc->maxencodings,
encodings_len + enc_tab[me_indexes[i]].val_len + 1 );
if ( hc->encodings[0] != '\0' )
{
(void) strcpy( &hc->encodings[encodings_len], "," );
++encodings_len;
}
(void) strcpy( &hc->encodings[encodings_len], enc_tab[me_indexes[i]].val );
encodings_len += enc_tab[me_indexes[i]].val_len;
}
}
#ifdef CGI_TIMELIMIT
static void
cgi_kill2( ClientData client_data, struct timeval* nowP )
{
pid_t pid;
pid = (pid_t) client_data.i;
if ( kill( pid, SIGKILL ) == 0 )
syslog( LOG_WARNING, "hard-killed CGI process %d", pid );
}
static void
cgi_kill( ClientData client_data, struct timeval* nowP )
{
pid_t pid;
pid = (pid_t) client_data.i;
if ( kill( pid, SIGINT ) == 0 )
{
syslog( LOG_WARNING, "killed CGI process %d", pid );
/* In case this isn't enough, schedule an uncatchable kill. */
if ( tmr_create( nowP, cgi_kill2, client_data, 5 * 1000L, 0 ) == (Timer*) 0 )
{
syslog( LOG_CRIT, "tmr_create(cgi_kill2) failed" );
exit( 1 );
}
}
}
#endif /* CGI_TIMELIMIT */
#ifdef GENERATE_INDEXES
/* qsort comparison routine */
static int
name_compare( const void* v1, const void* v2 )
{
const char** c1 = (const char**) v1;
const char** c2 = (const char**) v2;
return strcmp( *c1, *c2 );
}
static int
ls( httpd_conn* hc )
{
DIR* dirp;
struct dirent* de;
int namlen;
static int maxnames = 0;
int nnames;
static char* names;
static char** nameptrs;
static char* name;
static size_t maxname = 0;
static char* rname;
static size_t maxrname = 0;
static char* encrname;
static size_t maxencrname = 0;
FILE* fp;
int i, r;
struct stat sb;
struct stat lsb;
char modestr[20];
char* linkprefix;
char lnk[MAXPATHLEN+1];
int linklen;
char* fileclass;
time_t now;
char* timestr;
ClientData client_data;
dirp = opendir( hc->expnfilename );
if ( dirp == (DIR*) 0 )
{
syslog( LOG_ERR, "opendir %.80s - %m", hc->expnfilename );
httpd_send_err( hc, 404, err404title, "", err404form, hc->encodedurl );
return -1;
}
if ( hc->method == METHOD_HEAD )
{
closedir( dirp );
send_mime(
hc, 200, ok200title, "", "", "text/html; charset=%s", (off_t) -1,
hc->sb.st_mtime );
}
else if ( hc->method == METHOD_GET )
{
if ( hc->hs->cgi_limit != 0 && hc->hs->cgi_count >= hc->hs->cgi_limit )
{
closedir( dirp );
httpd_send_err(
hc, 503, httpd_err503title, "", httpd_err503form,
hc->encodedurl );
return -1;
}
++hc->hs->cgi_count;
r = fork( );
if ( r < 0 )
{
syslog( LOG_ERR, "fork - %m" );
closedir( dirp );
httpd_send_err(
hc, 500, err500title, "", err500form, hc->encodedurl );
return -1;
}
if ( r == 0 )
{
/* Child process. */
sub_process = 1;
httpd_unlisten( hc->hs );
send_mime(
hc, 200, ok200title, "", "", "text/html; charset=%s",
(off_t) -1, hc->sb.st_mtime );
httpd_write_response( hc );
#ifdef CGI_NICE
/* Set priority. */
(void) nice( CGI_NICE );
#endif /* CGI_NICE */
/* Open a stdio stream so that we can use fprintf, which is more
** efficient than a bunch of separate write()s. We don't have
** to worry about double closes or file descriptor leaks cause
** we're in a subprocess.
*/
fp = fdopen( hc->conn_fd, "w" );
if ( fp == (FILE*) 0 )
{
syslog( LOG_ERR, "fdopen - %m" );
httpd_send_err(
hc, 500, err500title, "", err500form, hc->encodedurl );
httpd_write_response( hc );
closedir( dirp );
exit( 1 );
}
(void) fprintf( fp, "\
<!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>Index of %.80s</title>\n\
</head>\n\
\n\
<body bgcolor=\"#99cc99\" text=\"#000000\" link=\"#2020ff\" vlink=\"#4040cc\">\n\
\n\
<h2>Index of %.80s</h2>\n\
\n\
<pre>\n\
mode links bytes last-changed name\n\
<hr>",
hc->encodedurl, hc->encodedurl );
/* Read in names. */
nnames = 0;
while ( ( de = readdir( dirp ) ) != 0 ) /* dirent or direct */
{
if ( nnames >= maxnames )
{
if ( maxnames == 0 )
{
maxnames = 100;
names = NEW( char, maxnames * ( MAXPATHLEN + 1 ) );
nameptrs = NEW( char*, maxnames );
}
else
{
maxnames *= 2;
names = RENEW( names, char, maxnames * ( MAXPATHLEN + 1 ) );
nameptrs = RENEW( nameptrs, char*, maxnames );
}
if ( names == (char*) 0 || nameptrs == (char**) 0 )
{
syslog( LOG_ERR, "out of memory reallocating directory names" );
exit( 1 );
}
for ( i = 0; i < maxnames; ++i )
nameptrs[i] = &names[i * ( MAXPATHLEN + 1 )];
}
namlen = NAMLEN(de);
(void) strncpy( nameptrs[nnames], de->d_name, namlen );
nameptrs[nnames][namlen] = '\0';
++nnames;
}
closedir( dirp );
/* Sort the names. */
qsort( nameptrs, nnames, sizeof(*nameptrs), name_compare );
/* Generate output. */
for ( i = 0; i < nnames; ++i )
{
httpd_realloc_str(
&name, &maxname,
strlen( hc->expnfilename ) + 1 + strlen( nameptrs[i] ) );
httpd_realloc_str(
&rname, &maxrname,
strlen( hc->origfilename ) + 1 + strlen( nameptrs[i] ) );
if ( hc->expnfilename[0] == '\0' ||
strcmp( hc->expnfilename, "." ) == 0 )
{
(void) strcpy( name, nameptrs[i] );
(void) strcpy( rname, nameptrs[i] );
}
else
{
(void) my_snprintf( name, maxname,
"%s/%s", hc->expnfilename, nameptrs[i] );
if ( strcmp( hc->origfilename, "." ) == 0 )
(void) my_snprintf( rname, maxrname,
"%s", nameptrs[i] );
else
(void) my_snprintf( rname, maxrname,
"%s%s", hc->origfilename, nameptrs[i] );
}
httpd_realloc_str(
&encrname, &maxencrname, 3 * strlen( rname ) + 1 );
strencode( encrname, maxencrname, rname );
if ( stat( name, &sb ) < 0 || lstat( name, &lsb ) < 0 )
continue;
linkprefix = "";
lnk[0] = '\0';
/* Break down mode word. First the file type. */
switch ( lsb.st_mode & S_IFMT )
{
case S_IFIFO: modestr[0] = 'p'; break;
case S_IFCHR: modestr[0] = 'c'; break;
case S_IFDIR: modestr[0] = 'd'; break;
case S_IFBLK: modestr[0] = 'b'; break;
case S_IFREG: modestr[0] = '-'; break;
case S_IFSOCK: modestr[0] = 's'; break;
case S_IFLNK: modestr[0] = 'l';
linklen = readlink( name, lnk, sizeof(lnk) - 1 );
if ( linklen != -1 )
{
lnk[linklen] = '\0';
linkprefix = " -&gt; ";
}
break;
default: modestr[0] = '?'; break;
}
/* Now the world permissions. Owner and group permissions
** are not of interest to web clients.
*/
modestr[1] = ( lsb.st_mode & S_IROTH ) ? 'r' : '-';
modestr[2] = ( lsb.st_mode & S_IWOTH ) ? 'w' : '-';
modestr[3] = ( lsb.st_mode & S_IXOTH ) ? 'x' : '-';
modestr[4] = '\0';
/* We also leave out the owner and group name, they are
** also not of interest to web clients. Plus if we're
** running under chroot(), they would require a copy
** of /etc/passwd and /etc/group, which we want to avoid.
*/
/* Get time string. */
now = time( (time_t*) 0 );
timestr = ctime( &lsb.st_mtime );
timestr[ 0] = timestr[ 4];
timestr[ 1] = timestr[ 5];
timestr[ 2] = timestr[ 6];
timestr[ 3] = ' ';
timestr[ 4] = timestr[ 8];
timestr[ 5] = timestr[ 9];
timestr[ 6] = ' ';
if ( now - lsb.st_mtime > 60*60*24*182 ) /* 1/2 year */
{
timestr[ 7] = ' ';
timestr[ 8] = timestr[20];
timestr[ 9] = timestr[21];
timestr[10] = timestr[22];
timestr[11] = timestr[23];
}
else
{
timestr[ 7] = timestr[11];
timestr[ 8] = timestr[12];
timestr[ 9] = ':';
timestr[10] = timestr[14];
timestr[11] = timestr[15];
}
timestr[12] = '\0';
/* The ls -F file class. */
switch ( sb.st_mode & S_IFMT )
{
case S_IFDIR: fileclass = "/"; break;
case S_IFSOCK: fileclass = "="; break;
case S_IFLNK: fileclass = "@"; break;
default:
fileclass = ( sb.st_mode & S_IXOTH ) ? "*" : "";
break;
}
/* And print. */
(void) fprintf( fp,
"%s %3ld %10lld %s <a href=\"/%.500s%s\">%.80s</a>%s%s%s\n",
modestr, (long) lsb.st_nlink, (long long) lsb.st_size,
timestr, encrname, S_ISDIR(sb.st_mode) ? "/" : "",
nameptrs[i], linkprefix, lnk, fileclass );
}
(void) fprintf( fp, " </pre>\n </body>\n</html>\n" );
(void) fclose( fp );
exit( 0 );
}
/* Parent process. */
closedir( dirp );
syslog( LOG_DEBUG, "spawned indexing process %d for directory '%.200s'", r, hc->expnfilename );
#ifdef CGI_TIMELIMIT
/* Schedule a kill for the child process, in case it runs too long */
client_data.i = r;
if ( tmr_create( (struct timeval*) 0, cgi_kill, client_data, CGI_TIMELIMIT * 1000L, 0 ) == (Timer*) 0 )
{
syslog( LOG_CRIT, "tmr_create(cgi_kill ls) failed" );
exit( 1 );
}
#endif /* CGI_TIMELIMIT */
hc->status = 200;
hc->bytes_sent = CGI_BYTECOUNT;
hc->should_linger = 0;
}
else
{
closedir( dirp );
httpd_send_err(
hc, 501, err501title, "", err501form, httpd_method_str( hc->method ) );
return -1;
}
return 0;
}
#endif /* GENERATE_INDEXES */
static char*
build_env( char* fmt, char* arg )
{
char* cp;
size_t size;
static char* buf;
static size_t maxbuf = 0;
size = strlen( fmt ) + strlen( arg );
if ( size > maxbuf )
httpd_realloc_str( &buf, &maxbuf, size );
(void) my_snprintf( buf, maxbuf, fmt, arg );
cp = strdup( buf );
if ( cp == (char*) 0 )
{
syslog( LOG_ERR, "out of memory copying environment variable" );
exit( 1 );
}
return cp;
}
#ifdef SERVER_NAME_LIST
static char*
hostname_map( char* hostname )
{
int len, n;
static char* list[] = { SERVER_NAME_LIST };
len = strlen( hostname );
for ( n = sizeof(list) / sizeof(*list) - 1; n >= 0; --n )
if ( strncasecmp( hostname, list[n], len ) == 0 )
if ( list[n][len] == '/' ) /* check in case of a substring match */
return &list[n][len + 1];
return (char*) 0;
}
#endif /* SERVER_NAME_LIST */
/* Set up environment variables. Be real careful here to avoid
** letting malicious clients overrun a buffer. We don't have
** to worry about freeing stuff since we're a sub-process.
*/
static char**
make_envp( httpd_conn* hc )
{
static char* envp[50];
int envn;
char* cp;
char buf[256];
envn = 0;
envp[envn++] = build_env( "PATH=%s", CGI_PATH );
#ifdef CGI_LD_LIBRARY_PATH
envp[envn++] = build_env( "LD_LIBRARY_PATH=%s", CGI_LD_LIBRARY_PATH );
#endif /* CGI_LD_LIBRARY_PATH */
envp[envn++] = build_env( "SERVER_SOFTWARE=%s", SERVER_SOFTWARE );
if ( hc->hs->vhost && hc->hostname != (char*) 0 && hc->hostname[0] != '\0' )
cp = hc->hostname;
else if ( hc->hdrhost != (char*) 0 && hc->hdrhost[0] != '\0' )
cp = hc->hdrhost;
else if ( hc->reqhost != (char*) 0 && hc->reqhost[0] != '\0' )
cp = hc->reqhost;
else
cp = hc->hs->server_hostname;
if ( cp != (char*) 0 )
envp[envn++] = build_env( "SERVER_NAME=%s", cp );
envp[envn++] = "GATEWAY_INTERFACE=CGI/1.1";
envp[envn++] = build_env("SERVER_PROTOCOL=%s", hc->protocol);
(void) my_snprintf( buf, sizeof(buf), "%d", (int) hc->hs->port );
envp[envn++] = build_env( "SERVER_PORT=%s", buf );
envp[envn++] = build_env(
"REQUEST_METHOD=%s", httpd_method_str( hc->method ) );
if ( hc->pathinfo[0] != '\0' )
{
char* cp2;
size_t l;
envp[envn++] = build_env( "PATH_INFO=/%s", hc->pathinfo );
l = strlen( hc->hs->cwd ) + strlen( hc->pathinfo ) + 1;
cp2 = NEW( char, l );
if ( cp2 != (char*) 0 )
{
(void) my_snprintf( cp2, l, "%s%s", hc->hs->cwd, hc->pathinfo );
envp[envn++] = build_env( "PATH_TRANSLATED=%s", cp2 );
}
}
envp[envn++] = build_env(
"SCRIPT_NAME=/%s", strcmp( hc->origfilename, "." ) == 0 ?
"" : hc->origfilename );
if ( hc->query[0] != '\0')
envp[envn++] = build_env( "QUERY_STRING=%s", hc->query );
envp[envn++] = build_env(
"REMOTE_ADDR=%s", httpd_ntoa( &hc->client_addr ) );
if ( hc->referrer[0] != '\0' )
{
envp[envn++] = build_env( "HTTP_REFERER=%s", hc->referrer );
envp[envn++] = build_env( "HTTP_REFERRER=%s", hc->referrer );
}
if ( hc->useragent[0] != '\0' )
envp[envn++] = build_env( "HTTP_USER_AGENT=%s", hc->useragent );
if ( hc->accept[0] != '\0' )
envp[envn++] = build_env( "HTTP_ACCEPT=%s", hc->accept );
if ( hc->accepte[0] != '\0' )
envp[envn++] = build_env( "HTTP_ACCEPT_ENCODING=%s", hc->accepte );
if ( hc->acceptl[0] != '\0' )
envp[envn++] = build_env( "HTTP_ACCEPT_LANGUAGE=%s", hc->acceptl );
if ( hc->cookie[0] != '\0' )
envp[envn++] = build_env( "HTTP_COOKIE=%s", hc->cookie );
if ( hc->contenttype[0] != '\0' )
envp[envn++] = build_env( "CONTENT_TYPE=%s", hc->contenttype );
if ( hc->hdrhost[0] != '\0' )
envp[envn++] = build_env( "HTTP_HOST=%s", hc->hdrhost );
if ( hc->contentlength != -1 )
{
(void) my_snprintf(
buf, sizeof(buf), "%lu", (unsigned long) hc->contentlength );
envp[envn++] = build_env( "CONTENT_LENGTH=%s", buf );
}
if ( hc->remoteuser[0] != '\0' )
envp[envn++] = build_env( "REMOTE_USER=%s", hc->remoteuser );
if ( hc->authorization[0] != '\0' )
envp[envn++] = build_env( "AUTH_TYPE=%s", "Basic" );
/* We only support Basic auth at the moment. */
if ( getenv( "TZ" ) != (char*) 0 )
envp[envn++] = build_env( "TZ=%s", getenv( "TZ" ) );
envp[envn++] = build_env( "CGI_PATTERN=%s", hc->hs->cgi_pattern );
envp[envn] = (char*) 0;
return envp;
}
/* Set up argument vector. Again, we don't have to worry about freeing stuff
** since we're a sub-process. This gets done after make_envp() because we
** scribble on hc->query.
*/
static char**
make_argp( httpd_conn* hc )
{
char** argp;
int argn;
char* cp1;
char* cp2;
/* By allocating an arg slot for every character in the query, plus
** one for the filename and one for the NULL, we are guaranteed to
** have enough. We could actually use strlen/2.
*/
argp = NEW( char*, strlen( hc->query ) + 2 );
if ( argp == (char**) 0 )
return (char**) 0;
argp[0] = strrchr( hc->expnfilename, '/' );
if ( argp[0] != (char*) 0 )
++argp[0];
else
argp[0] = hc->expnfilename;
argn = 1;
/* According to the CGI spec at http://hoohoo.ncsa.uiuc.edu/cgi/cl.html,
** "The server should search the query information for a non-encoded =
** character to determine if the command line is to be used, if it finds
** one, the command line is not to be used."
*/
if ( strchr( hc->query, '=' ) == (char*) 0 )
{
for ( cp1 = cp2 = hc->query; *cp2 != '\0'; ++cp2 )
{
if ( *cp2 == '+' )
{
*cp2 = '\0';
strdecode( cp1, cp1 );
argp[argn++] = cp1;
cp1 = cp2 + 1;
}
}
if ( cp2 != cp1 )
{
strdecode( cp1, cp1 );
argp[argn++] = cp1;
}
}
argp[argn] = (char*) 0;
return argp;
}
/* This routine is used only for POST requests. It reads the data
** from the request and sends it to the child process. The only reason
** we need to do it this way instead of just letting the child read
** directly is that we have already read part of the data into our
** buffer.
*/
static void
cgi_interpose_input( httpd_conn* hc, int wfd )
{
size_t c;
ssize_t r;
char buf[1024];
c = hc->read_idx - hc->checked_idx;
if ( c > 0 )
{
if ( httpd_write_fully( wfd, &(hc->read_buf[hc->checked_idx]), c ) != c )
return;
}
while ( c < hc->contentlength )
{
r = read( hc->conn_fd, buf, MIN( sizeof(buf), hc->contentlength - c ) );
if ( r < 0 && ( errno == EINTR || errno == EAGAIN ) )
{
sleep( 1 );
continue;
}
if ( r <= 0 )
return;
if ( httpd_write_fully( wfd, buf, r ) != r )
return;
c += r;
}
post_post_garbage_hack( hc );
}
/* Special hack to deal with broken browsers that send a LF or CRLF
** after POST data, causing TCP resets - we just read and discard up
** to 2 bytes. Unfortunately this doesn't fix the problem for CGIs
** which avoid the interposer process due to their POST data being
** short. Creating an interposer process for all POST CGIs is
** unacceptably expensive. The eventual fix will come when interposing
** gets integrated into the main loop as a tasklet instead of a process.
*/
static void
post_post_garbage_hack( httpd_conn* hc )
{
char buf[2];
/* If we are in a sub-process, turn on no-delay mode in case we
** previously cleared it.
*/
if ( sub_process )
httpd_set_ndelay( hc->conn_fd );
/* And read up to 2 bytes. */
(void) read( hc->conn_fd, buf, sizeof(buf) );
}
/* This routine is used for parsed-header CGIs. The idea here is that the
** CGI can return special headers such as "Status:" and "Location:" which
** change the return status of the response. Since the return status has to
** be the very first line written out, we have to accumulate all the headers
** and check for the special ones before writing the status. Then we write
** out the saved headers and proceed to echo the rest of the response.
*/
static void
cgi_interpose_output( httpd_conn* hc, int rfd )
{
int r;
char buf[1024];
size_t headers_size, headers_len;
char* headers;
char* br;
int status;
char* title;
char* cp;
/* Make sure the connection is in blocking mode. It should already
** be blocking, but we might as well be sure.
*/
httpd_clear_ndelay( hc->conn_fd );
/* Slurp in all headers. */
headers_size = 0;
httpd_realloc_str( &headers, &headers_size, 500 );
headers_len = 0;
for (;;)
{
r = read( rfd, buf, sizeof(buf) );
if ( r < 0 && ( errno == EINTR || errno == EAGAIN ) )
{
sleep( 1 );
continue;
}
if ( r <= 0 )
{
br = &(headers[headers_len]);
break;
}
httpd_realloc_str( &headers, &headers_size, headers_len + r );
(void) memmove( &(headers[headers_len]), buf, r );
headers_len += r;
headers[headers_len] = '\0';
if ( ( br = strstr( headers, "\015\012\015\012" ) ) != (char*) 0 ||
( br = strstr( headers, "\012\012" ) ) != (char*) 0 )
break;
}
/* If there were no headers, bail. */
if ( headers[0] == '\0' )
return;
/* Figure out the status. Look for a Status: or Location: header;
** else if there's an HTTP header line, get it from there; else
** default to 200.
*/
status = 200;
if ( strncmp( headers, "HTTP/", 5 ) == 0 )
{
cp = headers;
cp += strcspn( cp, " \t" );
status = atoi( cp );
}
if ( ( cp = strstr( headers, "Location:" ) ) != (char*) 0 &&
cp < br &&
( cp == headers || *(cp-1) == '\012' ) )
status = 302;
if ( ( cp = strstr( headers, "Status:" ) ) != (char*) 0 &&
cp < br &&
( cp == headers || *(cp-1) == '\012' ) )
{
cp += 7;
cp += strspn( cp, " \t" );
status = atoi( cp );
}
/* Write the status line. */
switch ( status )
{
case 200: title = ok200title; break;
case 302: title = err302title; break;
case 304: title = err304title; break;
case 400: title = httpd_err400title; break;
#ifdef AUTH_FILE
case 401: title = err401title; break;
#endif /* AUTH_FILE */
case 403: title = err403title; break;
case 404: title = err404title; break;
case 408: title = httpd_err408title; break;
case 451: title = err451title; break;
case 500: title = err500title; break;
case 501: title = err501title; break;
case 503: title = httpd_err503title; break;
default: title = "Something"; break;
}
(void) my_snprintf( buf, sizeof(buf), "HTTP/1.0 %d %s\015\012", status, title );
(void) httpd_write_fully( hc->conn_fd, buf, strlen( buf ) );
/* Write the saved headers. */
(void) httpd_write_fully( hc->conn_fd, headers, headers_len );
/* Echo the rest of the output. */
for (;;)
{
r = read( rfd, buf, sizeof(buf) );
if ( r < 0 && ( errno == EINTR || errno == EAGAIN ) )
{
sleep( 1 );
continue;
}
if ( r <= 0 )
break;
if ( httpd_write_fully( hc->conn_fd, buf, r ) != r )
break;
}
shutdown( hc->conn_fd, SHUT_WR );
}
/* CGI child process. */
static void
cgi_child( httpd_conn* hc )
{
int r;
char** argp;
char** envp;
char* binary;
char* directory;
/* Unset close-on-exec flag for this socket. This actually shouldn't
** be necessary, according to POSIX a dup()'d file descriptor does
** *not* inherit the close-on-exec flag, its flag is always clear.
** However, Linux messes this up and does copy the flag to the
** dup()'d descriptor, so we have to clear it. This could be
** ifdeffed for Linux only.
*/
(void) fcntl( hc->conn_fd, F_SETFD, 0 );
/* Close the syslog descriptor so that the CGI program can't
** mess with it. All other open descriptors should be either
** the listen socket(s), sockets from accept(), or the file-logging
** fd, and all of those are set to close-on-exec, so we don't
** have to close anything else.
*/
closelog();
/* If the socket happens to be using one of the stdin/stdout/stderr
** descriptors, move it to another descriptor so that the dup2 calls
** below don't screw things up. We arbitrarily pick fd 3 - if there
** was already something on it, we clobber it, but that doesn't matter
** since at this point the only fd of interest is the connection.
** All others will be closed on exec.
*/
if ( hc->conn_fd == STDIN_FILENO || hc->conn_fd == STDOUT_FILENO || hc->conn_fd == STDERR_FILENO )
{
int newfd = dup2( hc->conn_fd, STDERR_FILENO + 1 );
if ( newfd >= 0 )
hc->conn_fd = newfd;
/* If the dup2 fails, shrug. We'll just take our chances.
** Shouldn't happen though.
*/
}
/* Make the environment vector. */
envp = make_envp( hc );
/* Make the argument vector. */
argp = make_argp( hc );
/* Set up stdin. For POSTs we may have to set up a pipe from an
** interposer process, depending on if we've read some of the data
** into our buffer.
*/
if ( hc->method == METHOD_POST && hc->read_idx > hc->checked_idx )
{
int p[2];
if ( pipe( p ) < 0 )
{
syslog( LOG_ERR, "pipe - %m" );
httpd_send_err( hc, 500, err500title, "", err500form, hc->encodedurl );
httpd_write_response( hc );
exit( 1 );
}
r = fork( );
if ( r < 0 )
{
syslog( LOG_ERR, "fork - %m" );
httpd_send_err( hc, 500, err500title, "", err500form, hc->encodedurl );
httpd_write_response( hc );
exit( 1 );
}
if ( r == 0 )
{
/* Interposer process. */
sub_process = 1;
(void) close( p[0] );
cgi_interpose_input( hc, p[1] );
exit( 0 );
}
/* Need to schedule a kill for process r; but in the main process! */
(void) close( p[1] );
if ( p[0] != STDIN_FILENO )
{
(void) dup2( p[0], STDIN_FILENO );
(void) close( p[0] );
}
}
else
{
/* Otherwise, the request socket is stdin. */
if ( hc->conn_fd != STDIN_FILENO )
(void) dup2( hc->conn_fd, STDIN_FILENO );
}
/* Set up stdout/stderr. If we're doing CGI header parsing,
** we need an output interposer too.
*/
if ( strncmp( argp[0], "nph-", 4 ) != 0 && hc->mime_flag )
{
int p[2];
if ( pipe( p ) < 0 )
{
syslog( LOG_ERR, "pipe - %m" );
httpd_send_err( hc, 500, err500title, "", err500form, hc->encodedurl );
httpd_write_response( hc );
exit( 1 );
}
r = fork( );
if ( r < 0 )
{
syslog( LOG_ERR, "fork - %m" );
httpd_send_err( hc, 500, err500title, "", err500form, hc->encodedurl );
httpd_write_response( hc );
exit( 1 );
}
if ( r == 0 )
{
/* Interposer process. */
sub_process = 1;
(void) close( p[1] );
cgi_interpose_output( hc, p[0] );
exit( 0 );
}
/* Need to schedule a kill for process r; but in the main process! */
(void) close( p[0] );
if ( p[1] != STDOUT_FILENO )
(void) dup2( p[1], STDOUT_FILENO );
if ( p[1] != STDERR_FILENO )
(void) dup2( p[1], STDERR_FILENO );
if ( p[1] != STDOUT_FILENO && p[1] != STDERR_FILENO )
(void) close( p[1] );
}
else
{
/* Otherwise, the request socket is stdout/stderr. */
if ( hc->conn_fd != STDOUT_FILENO )
(void) dup2( hc->conn_fd, STDOUT_FILENO );
if ( hc->conn_fd != STDERR_FILENO )
(void) dup2( hc->conn_fd, STDERR_FILENO );
}
/* At this point we would like to set close-on-exec again for hc->conn_fd
** (see previous comments on Linux's broken behavior re: close-on-exec
** and dup.) Unfortunately there seems to be another Linux problem, or
** perhaps a different aspect of the same problem - if we do this
** close-on-exec in Linux, the socket stays open but stderr gets
** closed - the last fd duped from the socket. What a mess. So we'll
** just leave the socket as is, which under other OSs means an extra
** file descriptor gets passed to the child process. Since the child
** probably already has that file open via stdin stdout and/or stderr,
** this is not a problem.
*/
/* (void) fcntl( hc->conn_fd, F_SETFD, 1 ); */
#ifdef CGI_NICE
/* Set priority. */
(void) nice( CGI_NICE );
#endif /* CGI_NICE */
/* Split the program into directory and binary, so we can chdir()
** to the program's own directory. This isn't in the CGI 1.1
** spec, but it's what other HTTP servers do.
*/
directory = strdup( hc->expnfilename );
if ( directory == (char*) 0 )
binary = hc->expnfilename; /* ignore errors */
else
{
binary = strrchr( directory, '/' );
if ( binary == (char*) 0 )
binary = hc->expnfilename;
else
{
*binary++ = '\0';
(void) chdir( directory ); /* ignore errors */
}
}
/* Default behavior for SIGPIPE. */
#ifdef HAVE_SIGSET
(void) sigset( SIGPIPE, SIG_DFL );
#else /* HAVE_SIGSET */
(void) signal( SIGPIPE, SIG_DFL );
#endif /* HAVE_SIGSET */
/* Run the program. */
(void) execve( binary, argp, envp );
/* Something went wrong. */
syslog( LOG_ERR, "execve %.80s - %m", hc->expnfilename );
httpd_send_err( hc, 500, err500title, "", err500form, hc->encodedurl );
httpd_write_response( hc );
_exit( 1 );
}
static int
cgi( httpd_conn* hc )
{
int r;
ClientData client_data;
if ( hc->hs->cgi_limit != 0 && hc->hs->cgi_count >= hc->hs->cgi_limit )
{
httpd_send_err(
hc, 503, httpd_err503title, "", httpd_err503form,
hc->encodedurl );
return -1;
}
++hc->hs->cgi_count;
httpd_clear_ndelay( hc->conn_fd );
r = fork( );
if ( r < 0 )
{
syslog( LOG_ERR, "fork - %m" );
httpd_send_err(
hc, 500, err500title, "", err500form, hc->encodedurl );
return -1;
}
if ( r == 0 )
{
/* Child process. */
sub_process = 1;
httpd_unlisten( hc->hs );
cgi_child( hc );
}
/* Parent process. */
syslog( LOG_DEBUG, "spawned CGI process %d for file '%.200s'", r, hc->expnfilename );
#ifdef CGI_TIMELIMIT
/* Schedule a kill for the child process, in case it runs too long */
client_data.i = r;
if ( tmr_create( (struct timeval*) 0, cgi_kill, client_data, CGI_TIMELIMIT * 1000L, 0 ) == (Timer*) 0 )
{
syslog( LOG_CRIT, "tmr_create(cgi_kill child) failed" );
exit( 1 );
}
#endif /* CGI_TIMELIMIT */
hc->status = 200;
hc->bytes_sent = CGI_BYTECOUNT;
hc->should_linger = 0;
return 0;
}
static int
really_start_request( httpd_conn* hc, struct timeval* nowP )
{
static char* indexname;
static size_t maxindexname = 0;
static const char* index_names[] = { INDEX_NAMES };
int i;
#ifdef AUTH_FILE
static char* dirname;
static size_t maxdirname = 0;
#endif /* AUTH_FILE */
size_t expnlen, indxlen;
char* cp;
char* pi;
expnlen = strlen( hc->expnfilename );
/* Stat the file. */
if ( stat( hc->expnfilename, &hc->sb ) < 0 )
{
httpd_send_err( hc, 500, err500title, "", err500form, hc->encodedurl );
return -1;
}
/* Is it world-readable or world-executable? We check explicitly instead
** of just trying to open it, so that no one ever gets surprised by
** a file that's not set world-readable and yet somehow is
** readable by the HTTP server and therefore the *whole* world.
*/
if ( ! ( hc->sb.st_mode & ( S_IROTH | S_IXOTH ) ) )
{
syslog(
LOG_INFO,
"%.80s URL \"%.80s\" resolves to a non world-readable file",
httpd_ntoa( &hc->client_addr ), hc->encodedurl );
httpd_send_err(
hc, 403, err403title, "",
ERROR_FORM( err403form, "The requested URL '%.80s' resolves to a file that is not world-readable.\n" ),
hc->encodedurl );
return -1;
}
/* Is it a directory? */
if ( S_ISDIR(hc->sb.st_mode) )
{
/* If there's pathinfo, it's just a non-existent file. */
if ( hc->pathinfo[0] != '\0' )
{
httpd_send_err( hc, 404, err404title, "", err404form, hc->encodedurl );
return -1;
}
/* Special handling for directory URLs that don't end in a slash.
** We send back an explicit redirect with the slash, because
** otherwise many clients can't build relative URLs properly.
*/
if ( strcmp( hc->origfilename, "" ) != 0 &&
strcmp( hc->origfilename, "." ) != 0 &&
hc->origfilename[strlen( hc->origfilename ) - 1] != '/' )
{
send_dirredirect( hc );
return -1;
}
/* Check for an index file. */
for ( i = 0; i < sizeof(index_names) / sizeof(char*); ++i )
{
httpd_realloc_str(
&indexname, &maxindexname,
expnlen + 1 + strlen( index_names[i] ) );
(void) strcpy( indexname, hc->expnfilename );
indxlen = strlen( indexname );
if ( indxlen == 0 || indexname[indxlen - 1] != '/' )
(void) strcat( indexname, "/" );
if ( strcmp( indexname, "./" ) == 0 )
indexname[0] = '\0';
(void) strcat( indexname, index_names[i] );
if ( stat( indexname, &hc->sb ) >= 0 )
goto got_one;
}
/* Nope, no index file, so it's an actual directory request. */
#ifdef GENERATE_INDEXES
/* Directories must be readable for indexing. */
if ( ! ( hc->sb.st_mode & S_IROTH ) )
{
syslog(
LOG_INFO,
"%.80s URL \"%.80s\" tried to index a directory with indexing disabled",
httpd_ntoa( &hc->client_addr ), hc->encodedurl );
httpd_send_err(
hc, 403, err403title, "",
ERROR_FORM( err403form, "The requested URL '%.80s' resolves to a directory that has indexing disabled.\n" ),
hc->encodedurl );
return -1;
}
#ifdef AUTH_FILE
/* Check authorization for this directory. */
if ( auth_check( hc, hc->expnfilename ) == -1 )
return -1;
#endif /* AUTH_FILE */
/* Referrer check. */
if ( ! check_referrer( hc ) )
return -1;
/* Ok, generate an index. */
return ls( hc );
#else /* GENERATE_INDEXES */
syslog(
LOG_INFO, "%.80s URL \"%.80s\" tried to index a directory",
httpd_ntoa( &hc->client_addr ), hc->encodedurl );
httpd_send_err(
hc, 403, err403title, "",
ERROR_FORM( err403form, "The requested URL '%.80s' is a directory, and directory indexing is disabled on this server.\n" ),
hc->encodedurl );
return -1;
#endif /* GENERATE_INDEXES */
got_one: ;
/* Got an index file. Expand symlinks again. More pathinfo means
** something went wrong.
*/
cp = expand_symlinks( indexname, &pi, hc->hs->no_symlink_check, hc->tildemapped );
if ( cp == (char*) 0 || pi[0] != '\0' )
{
httpd_send_err( hc, 500, err500title, "", err500form, hc->encodedurl );
return -1;
}
expnlen = strlen( cp );
httpd_realloc_str( &hc->expnfilename, &hc->maxexpnfilename, expnlen );
(void) strcpy( hc->expnfilename, cp );
/* Now, is the index version world-readable or world-executable? */
if ( ! ( hc->sb.st_mode & ( S_IROTH | S_IXOTH ) ) )
{
syslog(
LOG_INFO,
"%.80s URL \"%.80s\" resolves to a non-world-readable index file",
httpd_ntoa( &hc->client_addr ), hc->encodedurl );
httpd_send_err(
hc, 403, err403title, "",
ERROR_FORM( err403form, "The requested URL '%.80s' resolves to an index file that is not world-readable.\n" ),
hc->encodedurl );
return -1;
}
}
#ifdef AUTH_FILE
/* Check authorization for this directory. */
httpd_realloc_str( &dirname, &maxdirname, expnlen );
(void) strcpy( dirname, hc->expnfilename );
cp = strrchr( dirname, '/' );
if ( cp == (char*) 0 )
(void) strcpy( dirname, "." );
else
*cp = '\0';
if ( auth_check( hc, dirname ) == -1 )
return -1;
/* Check if the filename is the AUTH_FILE itself - that's verboten. */
if ( expnlen == sizeof(AUTH_FILE) - 1 )
{
if ( strcmp( hc->expnfilename, AUTH_FILE ) == 0 )
{
syslog(
LOG_NOTICE,
"%.80s URL \"%.80s\" tried to retrieve an auth file",
httpd_ntoa( &hc->client_addr ), hc->encodedurl );
httpd_send_err(
hc, 403, err403title, "",
ERROR_FORM( err403form, "The requested URL '%.80s' is an authorization file, retrieving it is not permitted.\n" ),
hc->encodedurl );
return -1;
}
}
else if ( expnlen >= sizeof(AUTH_FILE) &&
strcmp( &(hc->expnfilename[expnlen - sizeof(AUTH_FILE) + 1]), AUTH_FILE ) == 0 &&
hc->expnfilename[expnlen - sizeof(AUTH_FILE)] == '/' )
{
syslog(
LOG_NOTICE,
"%.80s URL \"%.80s\" tried to retrieve an auth file",
httpd_ntoa( &hc->client_addr ), hc->encodedurl );
httpd_send_err(
hc, 403, err403title, "",
ERROR_FORM( err403form, "The requested URL '%.80s' is an authorization file, retrieving it is not permitted.\n" ),
hc->encodedurl );
return -1;
}
#endif /* AUTH_FILE */
/* Referrer check. */
if ( ! check_referrer( hc ) )
return -1;
/* Is it world-executable and in the CGI area? */
if ( hc->hs->cgi_pattern != (char*) 0 &&
( hc->sb.st_mode & S_IXOTH ) &&
match( hc->hs->cgi_pattern, hc->expnfilename ) )
return cgi( hc );
/* It's not CGI. If it's executable or there's pathinfo, someone's
** trying to either serve or run a non-CGI file as CGI. Either case
** is prohibited.
*/
if ( hc->sb.st_mode & S_IXOTH )
{
syslog(
LOG_NOTICE, "%.80s URL \"%.80s\" is executable but isn't CGI",
httpd_ntoa( &hc->client_addr ), hc->encodedurl );
httpd_send_err(
hc, 403, err403title, "",
ERROR_FORM( err403form, "The requested URL '%.80s' resolves to a file which is marked executable but is not a CGI file; retrieving it is forbidden.\n" ),
hc->encodedurl );
return -1;
}
if ( hc->pathinfo[0] != '\0' )
{
syslog(
LOG_INFO, "%.80s URL \"%.80s\" has pathinfo but isn't CGI",
httpd_ntoa( &hc->client_addr ), hc->encodedurl );
httpd_send_err(
hc, 403, err403title, "",
ERROR_FORM( err403form, "The requested URL '%.80s' resolves to a file plus CGI-style pathinfo, but the file is not a valid CGI file.\n" ),
hc->encodedurl );
return -1;
}
if ( hc->method != METHOD_GET && hc->method != METHOD_HEAD )
{
httpd_send_err(
hc, 501, err501title, "", err501form, httpd_method_str( hc->method ) );
return -1;
}
/* Fill in last_byte_index, if necessary. */
if ( hc->got_range &&
( hc->last_byte_index == -1 || hc->last_byte_index >= hc->sb.st_size ) )
hc->last_byte_index = hc->sb.st_size - 1;
figure_mime( hc );
if ( hc->method == METHOD_HEAD )
{
send_mime(
hc, 200, ok200title, hc->encodings, "", hc->type, hc->sb.st_size,
hc->sb.st_mtime );
}
else if ( hc->if_modified_since != (time_t) -1 &&
hc->if_modified_since >= hc->sb.st_mtime )
{
send_mime(
hc, 304, err304title, hc->encodings, "", hc->type, (off_t) -1,
hc->sb.st_mtime );
}
else
{
hc->file_address = mmc_map( hc->expnfilename, &(hc->sb), nowP );
if ( hc->file_address == (char*) 0 )
{
httpd_send_err( hc, 500, err500title, "", err500form, hc->encodedurl );
return -1;
}
send_mime(
hc, 200, ok200title, hc->encodings, "", hc->type, hc->sb.st_size,
hc->sb.st_mtime );
}
return 0;
}
int
httpd_start_request( httpd_conn* hc, struct timeval* nowP )
{
int r;
/* Really start the request. */
r = really_start_request( hc, nowP );
/* And return the status. */
return r;
}
static void
make_log_entry( httpd_conn* hc, struct timeval* nowP )
{
char* ru;
char url[305];
char bytes[40];
if ( hc->hs->no_log )
return;
/* This is straight CERN Combined Log Format - the only tweak
** being that if we're using syslog() we leave out the date, because
** syslogd puts it in. The included syslogtocern script turns the
** results into true CERN format.
*/
/* Format remote user. */
if ( hc->remoteuser[0] != '\0' )
ru = hc->remoteuser;
else
ru = "-";
/* If we're vhosting, prepend the hostname to the url. This is
** a little weird, perhaps writing separate log files for
** each vhost would make more sense.
*/
if ( hc->hs->vhost && ! hc->tildemapped )
(void) my_snprintf( url, sizeof(url),
"/%.100s%.200s",
hc->hostname == (char*) 0 ? hc->hs->server_hostname : hc->hostname,
hc->encodedurl );
else
(void) my_snprintf( url, sizeof(url),
"%.200s", hc->encodedurl );
/* Format the bytes. */
if ( hc->bytes_sent >= 0 )
(void) my_snprintf(
bytes, sizeof(bytes), "%lld", (long long) hc->bytes_sent );
else
(void) strcpy( bytes, "-" );
/* Logfile or syslog? */
if ( hc->hs->logfp != (FILE*) 0 )
{
time_t now;
struct tm* t;
const char* cernfmt_nozone = "%d/%b/%Y:%H:%M:%S";
char date_nozone[100];
int zone;
char sign;
char date[100];
/* Get the current time, if necessary. */
if ( nowP != (struct timeval*) 0 )
now = nowP->tv_sec;
else
now = time( (time_t*) 0 );
/* Format the time, forcing a numeric timezone (some log analyzers
** are stoooopid about this).
*/
t = localtime( &now );
(void) strftime( date_nozone, sizeof(date_nozone), cernfmt_nozone, t );
#ifdef HAVE_TM_GMTOFF
zone = t->tm_gmtoff / 60L;
#else
zone = -timezone / 60L;
/* Probably have to add something about daylight time here. */
#endif
if ( zone >= 0 )
sign = '+';
else
{
sign = '-';
zone = -zone;
}
zone = ( zone / 60 ) * 100 + zone % 60;
(void) my_snprintf( date, sizeof(date),
"%s %c%04d", date_nozone, sign, zone );
/* And write the log entry. */
(void) fprintf( hc->hs->logfp,
"%.80s - %.80s [%s] \"%.80s %.300s %.80s\" %d %s \"%.200s\" \"%.200s\"\n",
httpd_ntoa( &hc->client_addr ), ru, date,
httpd_method_str( hc->method ), url, hc->protocol,
hc->status, bytes, hc->referrer, hc->useragent );
#ifdef FLUSH_LOG_EVERY_TIME
(void) fflush( hc->hs->logfp );
#endif
}
else
syslog( LOG_INFO,
"%.80s - %.80s \"%.80s %.200s %.80s\" %d %s \"%.200s\" \"%.200s\"",
httpd_ntoa( &hc->client_addr ), ru,
httpd_method_str( hc->method ), url, hc->protocol,
hc->status, bytes, hc->referrer, hc->useragent );
}
/* Returns 1 if ok to serve the url, 0 if not. */
static int
check_referrer( httpd_conn* hc )
{
int r;
char* cp;
/* Are we doing referrer checking at all? */
if ( hc->hs->url_pattern == (char*) 0 )
return 1;
r = really_check_referrer( hc );
if ( ! r )
{
if ( hc->hs->vhost && hc->hostname != (char*) 0 )
cp = hc->hostname;
else
cp = hc->hs->server_hostname;
if ( cp == (char*) 0 )
cp = "";
syslog(
LOG_INFO, "%.80s non-local referrer \"%.80s%.80s\" \"%.80s\"",
httpd_ntoa( &hc->client_addr ), cp, hc->encodedurl, hc->referrer );
httpd_send_err(
hc, 403, err403title, "",
ERROR_FORM( err403form, "You must supply a local referrer to get URL '%.80s' from this server.\n" ),
hc->encodedurl );
}
return r;
}
/* Returns 1 if ok to serve the url, 0 if not. */
static int
really_check_referrer( httpd_conn* hc )
{
httpd_server* hs;
char* cp1;
char* cp2;
char* cp3;
static char* refhost = (char*) 0;
static size_t refhost_size = 0;
char *lp;
hs = hc->hs;
/* Check for an empty referrer. */
if ( hc->referrer == (char*) 0 || hc->referrer[0] == '\0' ||
( cp1 = strstr( hc->referrer, "//" ) ) == (char*) 0 )
{
/* Disallow if we require a referrer and the url matches. */
if ( hs->no_empty_referrers && match( hs->url_pattern, hc->origfilename ) )
return 0;
/* Otherwise ok. */
return 1;
}
/* Extract referrer host. */
cp1 += 2;
for ( cp2 = cp1; *cp2 != '/' && *cp2 != ':' && *cp2 != '\0'; ++cp2 )
continue;
httpd_realloc_str( &refhost, &refhost_size, cp2 - cp1 );
for ( cp3 = refhost; cp1 < cp2; ++cp1, ++cp3 )
if ( isupper(*cp1) )
*cp3 = tolower(*cp1);
else
*cp3 = *cp1;
*cp3 = '\0';
/* Local pattern? */
if ( hs->local_pattern != (char*) 0 )
lp = hs->local_pattern;
else
{
/* No local pattern. What's our hostname? */
if ( ! hs->vhost )
{
/* Not vhosting, use the server name. */
lp = hs->server_hostname;
if ( lp == (char*) 0 )
/* Couldn't figure out local hostname - give up. */
return 1;
}
else
{
/* We are vhosting, use the hostname on this connection. */
lp = hc->hostname;
if ( lp == (char*) 0 )
/* Oops, no hostname. Maybe it's an old browser that
** doesn't send a Host: header. We could figure out
** the default hostname for this IP address, but it's
** not worth it for the few requests like this.
*/
return 1;
}
}
/* If the referrer host doesn't match the local host pattern, and
** the filename does match the url pattern, it's an illegal reference.
*/
if ( ! match( lp, refhost ) && match( hs->url_pattern, hc->origfilename ) )
return 0;
/* Otherwise ok. */
return 1;
}
char*
httpd_ntoa( httpd_sockaddr* saP )
{
#ifdef USE_IPV6
static char str[200];
if ( getnameinfo( &saP->sa, sockaddr_len( saP ), str, sizeof(str), 0, 0, NI_NUMERICHOST ) != 0 )
{
str[0] = '?';
str[1] = '\0';
}
else if ( IN6_IS_ADDR_V4MAPPED( &saP->sa_in6.sin6_addr ) && strncmp( str, "::ffff:", 7 ) == 0 )
/* Elide IPv6ish prefix for IPv4 addresses. */
(void) ol_strcpy( str, &str[7] );
return str;
#else /* USE_IPV6 */
return inet_ntoa( saP->sa_in.sin_addr );
#endif /* USE_IPV6 */
}
static int
sockaddr_check( httpd_sockaddr* saP )
{
switch ( saP->sa.sa_family )
{
case AF_INET: return 1;
#ifdef USE_IPV6
case AF_INET6: return 1;
#endif /* USE_IPV6 */
default:
return 0;
}
}
static size_t
sockaddr_len( httpd_sockaddr* saP )
{
switch ( saP->sa.sa_family )
{
case AF_INET: return sizeof(struct sockaddr_in);
#ifdef USE_IPV6
case AF_INET6: return sizeof(struct sockaddr_in6);
#endif /* USE_IPV6 */
default:
return 0; /* shouldn't happen */
}
}
/* Some systems don't have snprintf(), so we make our own that uses
** either vsnprintf() or vsprintf(). If your system doesn't have
** vsnprintf(), it is probably vulnerable to buffer overruns.
** Upgrade!
*/
static int
my_snprintf( char* str, size_t size, const char* format, ... )
{
va_list ap;
int r;
va_start( ap, format );
#ifdef HAVE_VSNPRINTF
r = vsnprintf( str, size, format, ap );
#else /* HAVE_VSNPRINTF */
r = vsprintf( str, format, ap );
#endif /* HAVE_VSNPRINTF */
va_end( ap );
return r;
}
#ifndef HAVE_ATOLL
static long long
atoll( const char* str )
{
long long value;
long long sign;
while ( isspace( *str ) )
++str;
switch ( *str )
{
case '-': sign = -1; ++str; break;
case '+': sign = 1; ++str; break;
default: sign = 1; break;
}
value = 0;
while ( isdigit( *str ) )
{
value = value * 10 + ( *str - '0' );
++str;
}
return sign * value;
}
#endif /* HAVE_ATOLL */
/* Read the requested buffer completely, accounting for interruptions. */
int
httpd_read_fully( int fd, void* buf, size_t nbytes )
{
int nread;
nread = 0;
while ( nread < nbytes )
{
int r;
r = read( fd, (char*) buf + nread, nbytes - nread );
if ( r < 0 && ( errno == EINTR || errno == EAGAIN ) )
{
sleep( 1 );
continue;
}
if ( r < 0 )
return r;
if ( r == 0 )
break;
nread += r;
}
return nread;
}
/* Write the requested buffer completely, accounting for interruptions. */
int
httpd_write_fully( int fd, const char* buf, size_t nbytes )
{
int nwritten;
nwritten = 0;
while ( nwritten < nbytes )
{
int r;
r = write( fd, buf + nwritten, nbytes - nwritten );
if ( r < 0 && ( errno == EINTR || errno == EAGAIN ) )
{
sleep( 1 );
continue;
}
if ( r < 0 )
return r;
if ( r == 0 )
break;
nwritten += r;
}
return nwritten;
}
/* Generate debugging statistics syslog message. */
void
httpd_logstats( long secs )
{
if ( str_alloc_count > 0 )
syslog( LOG_NOTICE,
" libhttpd - %d strings allocated, %lu bytes (%g bytes/str)",
str_alloc_count, (unsigned long) str_alloc_size,
(float) str_alloc_size / str_alloc_count );
}