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mini_httpd.c
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/* mini_httpd - small HTTP server
**
** Copyright © 1999,2000 by Jef Poskanzer <[email protected]>.
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE.
*/
#include "version.h"
#include <unistd.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <limits.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <time.h>
#include <pwd.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <ctype.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <dirent.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "port.h"
#include "match.h"
#include "tdate_parse.h"
#ifdef HAVE_SENDFILE
# ifdef HAVE_LINUX_SENDFILE
# include <sys/sendfile.h>
# else /* HAVE_LINUX_SENDFILE */
# include <sys/uio.h>
# endif /* HAVE_LINUX_SENDFILE */
#endif /* HAVE_SENDFILE */
#if defined(TCP_CORK) && !defined(TCP_NOPUSH)
#define TCP_NOPUSH TCP_CORK
/* (Linux's TCP_CORK is basically the same as BSD's TCP_NOPUSH.) */
#endif
#ifdef USE_SSL
#include <openssl/ssl.h>
#include <openssl/err.h>
#elif defined(USE_AXTLS)
#include <axTLS/ssl.h>
/* axTLS doesn't have a header for these */
SSL_CTX * SSL_CTX_new(int);
void SSL_CTX_free(SSL_CTX*);
SSL * SSL_new(SSL_CTX*);
void SSL_free(SSL*);
int SSL_set_fd(SSL*, int);
int SSL_accept(SSL*);
void *SSLv23_server_method(void);
#endif
#if defined(AF_INET6) && defined(IN6_IS_ADDR_V4MAPPED)
#define USE_IPV6
#endif
#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 SIZE_T_MAX
#define SIZE_T_MAX 2147483647L
#endif
#ifndef HAVE_INT64T
typedef long long int64_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
/* Do overlapping strcpy safely, by using memmove. */
#define ol_strcpy(dst,src) memmove(dst,src,strlen(src)+1)
#ifndef ERR_DIR
#define ERR_DIR "errors"
#endif /* ERR_DIR */
#ifndef DEFAULT_HTTP_PORT
#define DEFAULT_HTTP_PORT 80
#endif /* DEFAULT_HTTP_PORT */
#if defined(USE_SSL) || defined(USE_AXTLS)
#ifndef DEFAULT_HTTPS_PORT
#define DEFAULT_HTTPS_PORT 443
#endif /* DEFAULT_HTTPS_PORT */
#ifndef DEFAULT_CERTFILE
#define DEFAULT_CERTFILE "mini_httpd.pem"
#endif /* DEFAULT_CERTFILE */
#endif /* USE_SSL || USE_AXTLS */
#ifndef DEFAULT_USER
#define DEFAULT_USER "nobody"
#endif /* DEFAULT_USER */
#ifndef CGI_NICE
#define CGI_NICE 10
#endif /* CGI_NICE */
#ifndef CGI_PATH
#define CGI_PATH "/usr/local/bin:/usr/ucb:/bin:/usr/bin"
#endif /* CGI_PATH */
#ifndef CGI_LD_LIBRARY_PATH
#define CGI_LD_LIBRARY_PATH "/usr/local/lib:/usr/lib"
#endif /* CGI_LD_LIBRARY_PATH */
#ifndef AUTH_FILE
#define AUTH_FILE ".htpasswd"
#endif /* AUTH_FILE */
#ifndef READ_TIMEOUT
#define READ_TIMEOUT 60
#endif /* READ_TIMEOUT */
#ifndef WRITE_TIMEOUT
#define WRITE_TIMEOUT 300
#endif /* WRITE_TIMEOUT */
#ifndef DEFAULT_CHARSET
#define DEFAULT_CHARSET "UTF-8"
#endif /* DEFAULT_CHARSET */
#ifndef MAX_SEND_BUFFER_SIZE
#define MAX_SEND_BUFFER_SIZE 1048576
#endif /* MAX_SEND_BUFFER_SIZE */
#define METHOD_UNKNOWN 0
#define METHOD_GET 1
#define METHOD_HEAD 2
#define METHOD_POST 3
/* A multi-family sockaddr. */
typedef union {
struct sockaddr sa;
struct sockaddr_in sa_in;
#ifdef USE_IPV6
struct sockaddr_in6 sa_in6;
struct sockaddr_storage sa_stor;
#endif /* USE_IPV6 */
} usockaddr;
static char* argv0;
static int debug;
static unsigned short port;
static char* dir;
static char* data_dir;
static int do_chroot;
static int vhost;
static char* user;
static char* cgi_pattern;
static char* url_pattern;
static int no_empty_referrers;
static char* local_pattern;
static char* hostname;
static char hostname_buf[500];
static char* logfile;
static char* pidfile;
static char* charset;
static char* p3p;
static int max_age;
static int read_timeout;
static FILE* logfp;
static int listen4_fd, listen6_fd;
static int do_ssl;
#if defined(USE_SSL) || defined(USE_AXTLS)
static char* certfile;
static char* cipher;
static SSL_CTX* ssl_ctx;
#endif /* USE_SSL || USE_AXTLS */
static char cwd[MAXPATHLEN];
static int got_hup;
/* Request variables. */
static int conn_fd;
#if defined(USE_SSL) || defined(USE_AXTLS)
static SSL* ssl;
#endif /* USE_SSL || USE_AXTLS */
static usockaddr client_addr;
static char* request;
static size_t request_size, request_len, request_idx;
static int method;
static char* path;
static char* file;
static char* pathinfo;
struct stat sb;
static char* query;
static char* protocol;
static int status;
static off_t bytes;
static char* req_hostname;
static char* authorization;
static size_t content_length;
static char* content_type;
static char* cookie;
static char* host;
static time_t if_modified_since;
static char* referrer;
static char* useragent;
static char* remoteuser;
/* Forwards. */
static void usage( void );
static void read_config( char* filename );
static void value_required( char* name, char* value );
static void no_value_required( char* name, char* value );
static int initialize_listen_socket( usockaddr* usaP );
static void handle_request( void );
static void de_dotdot( char* f );
static int get_pathinfo( void );
static void do_file( void );
static void do_dir( void );
#ifdef HAVE_SCANDIR
static char* file_details( const char* d, const char* name );
static void strencode( char* to, size_t tosize, const char* from );
#endif /* HAVE_SCANDIR */
static void do_cgi( void );
static void do_scgi( void );
static void cgi_interpose_input( int wfd );
static void post_post_garbage_hack( void );
static void cgi_interpose_output( int rfd, int parse_headers );
static char** make_argp( void );
static char** make_envp( void );
static char* build_env( char* fmt, char* arg, int* sum );
static void auth_check( char* dirname );
static void send_authenticate( char* realm );
static char* virtual_file( char* f );
static void send_error( int s, char* title, char* extra_header, char* text );
static void send_error_body( int s, char* title, char* text );
static int send_error_file( char* filename );
static void send_error_tail( void );
static void add_headers( int s, char* title, char* extra_header, char* me, char* mt, off_t b, time_t mod );
static void start_request( void );
static void add_to_request( char* str );
static void add_to_request_sz( char* str, int strsize );
static char* get_request_line( void );
static void start_response( void );
static void add_to_response( char* str );
static void send_response( void );
static void send_via_write( int fd, off_t size );
static void send_via_sendfile( int fd, int s, off_t size );
static ssize_t my_read( char* buf, size_t size );
static ssize_t my_write( void* buf, size_t size );
#ifdef HAVE_SENDFILE
static int my_sendfile( int fd, int s, off_t offset, size_t nbytes );
#endif /* HAVE_SENDFILE */
static void add_str( char** bufP, size_t* bufsizeP, size_t* buflenP, char* str );
static void add_str_sz( char** bufP, size_t* bufsizeP, size_t* buflenP, char* str, int strsize );
static void make_log_entry( void );
static void check_referrer( void );
static int really_check_referrer( void );
static char* get_method_str( int m );
static void init_mime( void );
static const char* figure_mime( char* name, char* me, size_t me_size );
static void handle_sigterm( int sig );
static void handle_sighup( int sig );
static void handle_sigchld( int sig );
static void re_open_logfile( void );
static void handle_read_timeout( int sig );
static void handle_write_timeout( int sig );
static void lookup_hostname( usockaddr* usa4P, size_t sa4_len, int* gotv4P, usockaddr* usa6P, size_t sa6_len, int* gotv6P );
static char* ntoa( usockaddr* usaP );
static int sockaddr_check( usockaddr* usaP );
static size_t sockaddr_len( usockaddr* usaP );
static void strdecode( char* to, char* from );
static int hexit( char c );
static int b64_decode( const char* str, unsigned char* space, int size );
static void set_ndelay( int fd );
static void clear_ndelay( int fd );
static void* e_malloc( size_t size );
static void* e_realloc( void* optr, size_t size );
static char* e_strdup( char* ostr );
#ifdef NO_SNPRINTF
static int snprintf( char* str, size_t size, const char* format, ... );
#endif /* NO_SNPRINTF */
int
main( int argc, char** argv )
{
int argn;
struct passwd* pwd;
uid_t uid = 32767;
gid_t gid = 32767;
usockaddr host_addr4;
usockaddr host_addr6;
int gotv4, gotv6;
fd_set lfdset;
int maxfd;
usockaddr usa;
socklen_t sz;
int r;
char* cp;
/* Parse args. */
argv0 = argv[0];
debug = 0;
port = 0;
dir = (char*) 0;
data_dir = (char*) 0;
do_chroot = 0;
vhost = 0;
cgi_pattern = (char*) 0;
url_pattern = (char*) 0;
no_empty_referrers = 0;
local_pattern = (char*) 0;
charset = DEFAULT_CHARSET;
p3p = (char*) 0;
max_age = -1;
read_timeout = READ_TIMEOUT;
user = DEFAULT_USER;
hostname = (char*) 0;
logfile = (char*) 0;
pidfile = (char*) 0;
logfp = (FILE*) 0;
do_ssl = 0;
#if defined(USE_SSL) || defined(USE_AXTLS)
certfile = DEFAULT_CERTFILE;
cipher = (char*) 0;
#endif /* USE_SSL || USE_AXTLS */
argn = 1;
while ( argn < argc && argv[argn][0] == '-' )
{
if ( strcmp( argv[argn], "-V" ) == 0 )
{
(void) printf( "%s\n", SERVER_SOFTWARE );
exit( 0 );
}
else if ( strcmp( argv[argn], "-C" ) == 0 && argn + 1 < argc )
{
++argn;
read_config( argv[argn] );
}
else if ( strcmp( argv[argn], "-D" ) == 0 )
debug = 1;
#if defined(USE_SSL) || defined(USE_AXTLS)
else if ( strcmp( argv[argn], "-S" ) == 0 )
do_ssl = 1;
else if ( strcmp( argv[argn], "-E" ) == 0 && argn + 1 < argc )
{
++argn;
certfile = argv[argn];
}
else if ( strcmp( argv[argn], "-Y" ) == 0 && argn + 1 < argc )
{
++argn;
cipher = argv[argn];
}
#endif /* USE_SSL || USE_AXTLS */
else if ( strcmp( argv[argn], "-p" ) == 0 && argn + 1 < argc )
{
++argn;
port = (unsigned short) atoi( argv[argn] );
}
else if ( strcmp( argv[argn], "-d" ) == 0 && argn + 1 < argc )
{
++argn;
dir = argv[argn];
}
else if ( strcmp( argv[argn], "-dd" ) == 0 && argn + 1 < argc )
{
++argn;
data_dir = argv[argn];
}
else if ( strcmp( argv[argn], "-c" ) == 0 && argn + 1 < argc )
{
++argn;
cgi_pattern = argv[argn];
}
else if ( strcmp( argv[argn], "-u" ) == 0 && argn + 1 < argc )
{
++argn;
user = argv[argn];
}
else if ( strcmp( argv[argn], "-h" ) == 0 && argn + 1 < argc )
{
++argn;
hostname = argv[argn];
}
else if ( strcmp( argv[argn], "-r" ) == 0 )
do_chroot = 1;
else if ( strcmp( argv[argn], "-v" ) == 0 )
vhost = 1;
else if ( strcmp( argv[argn], "-l" ) == 0 && argn + 1 < argc )
{
++argn;
logfile = argv[argn];
}
else if ( strcmp( argv[argn], "-i" ) == 0 && argn + 1 < argc )
{
++argn;
pidfile = argv[argn];
}
else if ( strcmp( argv[argn], "-T" ) == 0 && argn + 1 < argc )
{
++argn;
charset = argv[argn];
}
else if ( strcmp( argv[argn], "-P" ) == 0 && argn + 1 < argc )
{
++argn;
p3p = argv[argn];
}
else if ( strcmp( argv[argn], "-M" ) == 0 && argn + 1 < argc )
{
++argn;
max_age = atoi( argv[argn] );
}
else if ( strcmp( argv[argn], "-R" ) == 0 && argn + 1 < argc )
{
++argn;
read_timeout = atoi( argv[argn] );
}
else
usage();
++argn;
}
if ( argn != argc )
usage();
cp = strrchr( argv0, '/' );
if ( cp != (char*) 0 )
++cp;
else
cp = argv0;
openlog( cp, LOG_NDELAY|LOG_PID, LOG_DAEMON );
if ( port == 0 )
{
#if defined(USE_SSL) || defined(USE_AXTLS)
if ( do_ssl )
port = DEFAULT_HTTPS_PORT;
else
port = DEFAULT_HTTP_PORT;
#else /* USE_SSL || USE_AXTLS */
port = DEFAULT_HTTP_PORT;
#endif /* USE_SSL || USE_AXTLS */
}
/* If we're root and we're going to become another user, get the uid/gid
** now.
*/
if ( getuid() == 0 )
{
pwd = getpwnam( user );
if ( pwd == (struct passwd*) 0 )
{
syslog( LOG_CRIT, "unknown user - '%s'", user );
(void) fprintf( stderr, "%s: unknown user - '%s'\n", argv0, user );
exit( 1 );
}
uid = pwd->pw_uid;
gid = pwd->pw_gid;
}
/* Log file. */
if ( logfile != (char*) 0 )
{
logfp = fopen( logfile, "a" );
if ( logfp == (FILE*) 0 )
{
syslog( LOG_CRIT, "%s - %m", logfile );
perror( logfile );
exit( 1 );
}
if ( logfile[0] != '/' )
{
syslog( LOG_WARNING, "logfile is not an absolute path, you may not be able to re-open it" );
(void) fprintf( stderr, "%s: logfile is not an absolute path, you may not be able to re-open it\n", argv0 );
}
if ( getuid() == 0 )
{
/* If we are root then we chown the log file to the user we'll
** be switching to.
*/
if ( fchown( fileno( logfp ), uid, gid ) < 0 )
{
syslog( LOG_WARNING, "fchown logfile - %m" );
perror( "fchown logfile" );
}
}
}
/* Look up hostname. */
lookup_hostname(
&host_addr4, sizeof(host_addr4), &gotv4,
&host_addr6, sizeof(host_addr6), &gotv6 );
if ( hostname == (char*) 0 )
{
(void) gethostname( hostname_buf, sizeof(hostname_buf) );
hostname = hostname_buf;
}
if ( ! ( gotv4 || gotv6 ) )
{
syslog( LOG_CRIT, "can't find any valid address" );
(void) fprintf( stderr, "%s: can't find any valid address\n", argv0 );
exit( 1 );
}
/* 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 ( gotv6 )
listen6_fd = initialize_listen_socket( &host_addr6 );
else
listen6_fd = -1;
if ( gotv4 )
listen4_fd = initialize_listen_socket( &host_addr4 );
else
listen4_fd = -1;
/* If we didn't get any valid sockets, fail. */
if ( listen4_fd == -1 && listen6_fd == -1 )
{
syslog( LOG_CRIT, "can't bind to any address" );
(void) fprintf( stderr, "%s: can't bind to any address\n", argv0 );
exit( 1 );
}
#ifdef USE_SSL
if ( do_ssl )
{
SSL_load_error_strings();
SSLeay_add_ssl_algorithms();
ssl_ctx = SSL_CTX_new( SSLv23_server_method() );
SSL_CTX_set_options( ssl_ctx, SSL_OP_NO_SSLv3 );
if ( certfile[0] != '\0' )
if ( SSL_CTX_use_certificate_file( ssl_ctx, certfile, SSL_FILETYPE_PEM ) == 0 ||
SSL_CTX_use_PrivateKey_file( ssl_ctx, certfile, SSL_FILETYPE_PEM ) == 0 ||
SSL_CTX_check_private_key( ssl_ctx ) == 0 )
{
ERR_print_errors_fp( stderr );
exit( 1 );
}
if ( cipher != (char*) 0 )
{
if ( SSL_CTX_set_cipher_list( ssl_ctx, cipher ) == 0 )
{
ERR_print_errors_fp( stderr );
exit( 1 );
}
}
}
#endif /* USE_SSL */
#ifdef USE_AXTLS
if ( do_ssl )
{
ssl_ctx = SSL_CTX_new( SSLv23_server_method() );
if ( certfile[0] != '\0' )
{
if ( SSL_CTX_use_certificate_file( ssl_ctx, certfile, 0 ) == 0 ||
SSL_CTX_use_PrivateKey_file( ssl_ctx, certfile, 0 ) == 0 ||
SSL_CTX_check_private_key( ssl_ctx ) == 0 )
{
ERR_print_errors_fp( stderr );
exit(1);
}
}
if ( cipher != (char*) 0 )
{
if ( SSL_CTX_set_cipher_list( ssl_ctx, cipher ) == 0 )
{
ERR_print_errors_fp( stderr );
exit( 1 );
}
}
}
#endif /* USE_AXTLS */
if ( ! debug )
{
/* Make ourselves a daemon. */
#ifdef HAVE_DAEMON
if ( daemon( 1, 1 ) < 0 )
{
syslog( LOG_CRIT, "daemon - %m" );
perror( "daemon" );
exit( 1 );
}
#else
switch ( fork() )
{
case 0:
break;
case -1:
syslog( LOG_CRIT, "fork - %m" );
perror( "fork" );
exit( 1 );
default:
exit( 0 );
}
#ifdef HAVE_SETSID
(void) setsid();
#endif
#endif
}
else
{
/* Even if we don't daemonize, we still want to disown our parent
** process.
*/
#ifdef HAVE_SETSID
(void) setsid();
#endif /* HAVE_SETSID */
}
if ( pidfile != (char*) 0 )
{
/* Write the PID file. */
FILE* pidfp = fopen( pidfile, "w" );
if ( pidfp == (FILE*) 0 )
{
syslog( LOG_CRIT, "%s - %m", pidfile );
perror( pidfile );
exit( 1 );
}
(void) fprintf( pidfp, "%d\n", (int) getpid() );
(void) fclose( pidfp );
}
/* Read zone info now, in case we chroot(). */
tzset();
/* If we're root, start becoming someone else. */
if ( getuid() == 0 )
{
/* Set aux groups to null. */
if ( setgroups( 0, (gid_t*) 0 ) < 0 )
{
syslog( LOG_CRIT, "setgroups - %m" );
perror( "setgroups" );
exit( 1 );
}
/* Set primary group. */
if ( setgid( gid ) < 0 )
{
syslog( LOG_CRIT, "setgid - %m" );
perror( "setgid" );
exit( 1 );
}
/* Try setting aux groups correctly - not critical if this fails. */
if ( initgroups( user, gid ) < 0 )
{
syslog( LOG_ERR, "initgroups - %m" );
perror( "initgroups" );
}
#ifdef HAVE_SETLOGIN
/* Set login name. */
(void) setlogin( user );
#endif /* HAVE_SETLOGIN */
}
/* Switch directories if requested. */
if ( dir != (char*) 0 )
{
if ( chdir( dir ) < 0 )
{
syslog( LOG_CRIT, "chdir - %m" );
perror( "chdir" );
exit( 1 );
}
}
/* Get current directory. */
(void) getcwd( cwd, sizeof(cwd) - 1 );
if ( cwd[strlen( cwd ) - 1] != '/' )
(void) strcat( cwd, "/" );
/* Chroot if requested. */
if ( do_chroot )
{
if ( chroot( cwd ) < 0 )
{
syslog( LOG_CRIT, "chroot - %m" );
perror( "chroot" );
exit( 1 );
}
/* If we're logging and the logfile's pathname begins with the
** chroot tree's pathname, then elide the chroot pathname so
** that the logfile pathname still works from inside the chroot
** tree.
*/
if ( logfile != (char*) 0 )
{
if ( strncmp( logfile, cwd, strlen( cwd ) ) == 0 )
{
(void) ol_strcpy( logfile, &logfile[strlen( cwd ) - 1] );
/* (We already guaranteed that cwd ends with a slash, so leaving
** that slash in logfile makes it an absolute pathname within
** the chroot tree.)
*/
}
else
{
syslog( LOG_WARNING, "logfile is not within the chroot tree, you will not be able to re-open it" );
(void) fprintf( stderr, "%s: logfile is not within the chroot tree, you will not be able to re-open it\n", argv0 );
}
}
(void) strcpy( cwd, "/" );
/* Always chdir to / after a chroot. */
if ( chdir( cwd ) < 0 )
{
syslog( LOG_CRIT, "chroot chdir - %m" );
perror( "chroot chdir" );
exit( 1 );
}
}
/* Switch directories again if requested. */
if ( data_dir != (char*) 0 )
{
if ( chdir( data_dir ) < 0 )
{
syslog( LOG_CRIT, "data_dir chdir - %m" );
perror( "data_dir chdir" );
exit( 1 );
}
}
/* If we're root, become someone else. */
if ( getuid() == 0 )
{
/* Set uid. */
if ( setuid( uid ) < 0 )
{
syslog( LOG_CRIT, "setuid - %m" );
perror( "setuid" );
exit( 1 );
}
/* Check for unnecessary security exposure. */
if ( ! do_chroot )
{
syslog( LOG_WARNING,
"started as root without requesting chroot(), warning only" );
(void) fprintf( stderr,
"%s: started as root without requesting chroot(), warning only\n", argv0 );
}
}
/* Catch various signals. */
#ifdef HAVE_SIGSET
(void) sigset( SIGTERM, handle_sigterm );
(void) sigset( SIGINT, handle_sigterm );
(void) sigset( SIGUSR1, handle_sigterm );
(void) sigset( SIGHUP, handle_sighup );
(void) sigset( SIGCHLD, handle_sigchld );
(void) sigset( SIGPIPE, SIG_IGN );
#else /* HAVE_SIGSET */
(void) signal( SIGTERM, handle_sigterm );
(void) signal( SIGINT, handle_sigterm );
(void) signal( SIGUSR1, handle_sigterm );
(void) signal( SIGHUP, handle_sighup );
(void) signal( SIGCHLD, handle_sigchld );
(void) signal( SIGPIPE, SIG_IGN );
#endif /* HAVE_SIGSET */
got_hup = 0;
init_mime();
if ( hostname == (char*) 0 )
syslog(
LOG_NOTICE, "%.80s starting on port %d", SERVER_SOFTWARE,
(int) port );
else
syslog(
LOG_NOTICE, "%.80s starting on %.80s, port %d", SERVER_SOFTWARE,
hostname, (int) port );
/* Main loop. */
for (;;)
{
/* Do we need to re-open the log file? */
if ( got_hup )
{
re_open_logfile();
got_hup = 0;
}
/* Do a select() on at least one and possibly two listen fds.
** If there's only one listen fd then we could skip the select
** and just do the (blocking) accept(), saving one system call;
** that's what happened up through version 1.18. However there
** is one slight drawback to that method: the blocking accept()
** is not interrupted by a signal call. Since we definitely want
** signals to interrupt a waiting server, we use select() even
** if there's only one fd.
*/
FD_ZERO( &lfdset );
maxfd = -1;
if ( listen4_fd != -1 )
{
FD_SET( listen4_fd, &lfdset );
if ( listen4_fd > maxfd )
maxfd = listen4_fd;
}
if ( listen6_fd != -1 )
{
FD_SET( listen6_fd, &lfdset );
if ( listen6_fd > maxfd )
maxfd = listen6_fd;
}
if ( select( maxfd + 1, &lfdset, (fd_set*) 0, (fd_set*) 0, (struct timeval*) 0 ) < 0 )
{
if ( errno == EINTR || errno == EAGAIN )
continue; /* try again */
syslog( LOG_CRIT, "select - %m" );
perror( "select" );
exit( 1 );
}
/* Accept the new connection. */
sz = sizeof(usa);
if ( listen4_fd != -1 && FD_ISSET( listen4_fd, &lfdset ) )
conn_fd = accept( listen4_fd, &usa.sa, &sz );
else if ( listen6_fd != -1 && FD_ISSET( listen6_fd, &lfdset ) )
conn_fd = accept( listen6_fd, &usa.sa, &sz );
else
{
syslog( LOG_CRIT, "select failure" );
(void) fprintf( stderr, "%s: select failure\n", argv0 );
exit( 1 );
}
if ( conn_fd < 0 )
{
if ( errno == EINTR || errno == EAGAIN || errno == ECONNABORTED )
continue; /* try again */
#ifdef EPROTO
if ( errno == EPROTO )
continue; /* try again */
#endif /* EPROTO */
syslog( LOG_CRIT, "accept - %m" );
perror( "accept" );
exit( 1 );
}
/* Fork a sub-process to handle the connection. */
r = fork();
if ( r < 0 )
{
syslog( LOG_CRIT, "fork - %m" );
perror( "fork" );
exit( 1 );
}
if ( r == 0 )
{
/* Child process. */
client_addr = usa;
if ( listen4_fd != -1 )
(void) close( listen4_fd );
if ( listen6_fd != -1 )
(void) close( listen6_fd );
handle_request();
exit( 0 );
}
(void) close( conn_fd );
}
}
static void
usage( void )
{
#if defined(USE_SSL) || defined(USE_AXTLS)
(void) fprintf( stderr, "usage: %s [-C configfile] [-D] [-S] [-E certfile] [-Y cipher] [-p port] [-d dir] [-dd data_dir] [-c cgipat] [-u user] [-h hostname] [-r] [-v] [-l logfile] [-i pidfile] [-T charset] [-P P3P] [-M maxage] [-R readtimeout]\n", argv0 );
#else /* USE_SSL || USE_AXTLS */
(void) fprintf( stderr, "usage: %s [-C configfile] [-D] [-p port] [-d dir] [-dd data_dir] [-c cgipat] [-u user] [-h hostname] [-r] [-v] [-l logfile] [-i pidfile] [-T charset] [-P P3P] [-M maxage] [-R readtimeout]\n", argv0 );
#endif /* USE_SSL || USE_AXTLS */
exit( 1 );
}
static void
read_config( char* filename )
{
FILE* fp;
char line[10000];
char* cp;
char* cp2;
char* name;
char* value;
fp = fopen( filename, "r" );
if ( fp == (FILE*) 0 )
{
syslog( LOG_CRIT, "%s - %m", filename );
perror( filename );
exit( 1 );
}
while ( fgets( line, sizeof(line), fp ) != (char*) 0 )
{
/* Trim comments. */
if ( ( cp = strchr( line, '#' ) ) != (char*) 0 )
*cp = '\0';
/* Skip leading whitespace. */
cp = line;
cp += strspn( cp, " \t\012\015" );
/* Split line into words. */
while ( *cp != '\0' )
{
/* Find next whitespace. */
cp2 = cp + strcspn( cp, " \t\012\015" );
/* Insert EOS and advance next-word pointer. */
while ( *cp2 == ' ' || *cp2 == '\t' || *cp2 == '\012' || *cp2 == '\015' )
*cp2++ = '\0';
/* Split into name and value. */
name = cp;
value = strchr( name, '=' );
if ( value != (char*) 0 )
*value++ = '\0';
/* Interpret. */
if ( strcasecmp( name, "debug" ) == 0 )
{
no_value_required( name, value );
debug = 1;
}
else if ( strcasecmp( name, "port" ) == 0 )
{
value_required( name, value );
port = (unsigned short) atoi( value );
}
else if ( strcasecmp( name, "dir" ) == 0 )
{
value_required( name, value );
dir = e_strdup( value );
}
else if ( strcasecmp( name, "data_dir" ) == 0 )
{
value_required( name, value );
data_dir = e_strdup( value );
}
else if ( strcasecmp( name, "chroot" ) == 0 )
{
no_value_required( name, value );
do_chroot = 1;
}
else if ( strcasecmp( name, "nochroot" ) == 0 )
{
no_value_required( name, value );
do_chroot = 0;
}
else if ( strcasecmp( name, "user" ) == 0 )
{