appl/kx/kx.h

   1 /*
   2  * Copyright (c) 1995 - 2001 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /* $Id$ */
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include "config.h"
  38 #endif /* HAVE_CONFIG_H */
  39
  40 #include <stdio.h>
  41 #include <stdarg.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <signal.h>
  45 #include <errno.h>
  46 #ifdef HAVE_UNISTD_H
  47 #include <unistd.h>
  48 #endif
  49 #ifdef HAVE_PWD_H
  50 #include <pwd.h>
  51 #endif
  52 #ifdef HAVE_GRP_H
  53 #include <grp.h>
  54 #endif
  55 #ifdef HAVE_SYSLOG_H
  56 #include <syslog.h>
  57 #endif
  58 #ifdef HAVE_SYS_TYPES_H
  59 #include <sys/types.h>
  60 #endif
  61 #ifdef TIME_WITH_SYS_TIME
  62 #include <sys/time.h>
  63 #include <time.h>
  64 #elif defined(HAVE_SYS_TIME_H)
  65 #include <sys/time.h>
  66 #else
  67 #include <time.h>
  68 #endif
  69 #ifdef HAVE_SYS_RESOURCE_H
  70 #include <sys/resource.h>
  71 #endif
  72 #ifdef HAVE_SYS_SELECT_H
  73 #include <sys/select.h>
  74 #endif
  75 #ifdef HAVE_SYS_WAIT_H
  76 #include <sys/wait.h>
  77 #endif
  78 #ifdef HAVE_SYS_STAT_H
  79 #include <sys/stat.h>
  80 #endif
  81 #ifdef HAVE_SYS_SOCKET_H
  82 #include <sys/socket.h>
  83 #endif
  84 #ifdef HAVE_NETINET_IN_H
  85 #include <netinet/in.h>
  86 #endif
  87 #ifdef HAVE_NETINET_TCP_H
  88 #include <netinet/tcp.h>
  89 #endif
  90 #ifdef HAVE_ARPA_INET_H
  91 #include <arpa/inet.h>
  92 #endif
  93 #ifdef HAVE_NETDB_H
  94 #include <netdb.h>
  95 #endif
  96 #ifdef HAVE_SYS_UN_H
  97 #include <sys/un.h>
  98 #endif
  99 #include <X11/X.h>
 100 #include <X11/Xlib.h>
 101 #include <X11/Xauth.h>
 102
 103 #ifdef HAVE_SYS_STREAM_H
 104 #include <sys/stream.h>
 105 #endif
 106 #ifdef HAVE_SYS_STROPTS_H
 107 #include <sys/stropts.h>
 108 #endif
 109
 110 /* defined by aix's sys/stream.h and again by arpa/nameser.h */
 111
 112 #undef NOERROR
 113
 114 /* as far as we know, this is only used with later versions of Slowlaris */
 115 #if SunOS >= 50 && defined(HAVE_SYS_STROPTS_H) && defined(HAVE_FATTACH) && defined(I_PUSH)
 116 #define MAY_HAVE_X11_PIPES
 117 #endif
 118
 119 #ifdef SOCKS
 120 #include <socks.h>
 121 /* This doesn't belong here. */
 122 struct tm *localtime(const time_t *);
 123 struct hostent  *gethostbyname(const char *);
 124 #endif
 125
 126 #ifdef KRB5
 127 #include <krb5.h>
 128 #endif
 129
 130 #include <err.h>
 131 #include <getarg.h>
 132 #include <roken.h>
 133
 134 struct x_socket {
 135     char *pathname;
 136     int fd;
 137     enum {
 138         LISTENP     = 0x80,
 139         TCP         = LISTENP | 1,
 140         UNIX_SOCKET = LISTENP | 2,
 141         STREAM_PIPE = 3
 142     } flags;
 143 };
 144
 145 extern char x_socket[];
 146 extern uint32_t display_num;
 147 extern char display[];
 148 extern int display_size;
 149 extern char xauthfile[];
 150 extern int xauthfile_size;
 151 extern u_char cookie[];
 152 extern size_t cookie_len;
 153
 154 int get_xsockets (int *number, struct x_socket **sockets, int tcpp);
 155 int chown_xsockets (int n, struct x_socket *sockets, uid_t uid, gid_t gid);
 156
 157 int connect_local_xsocket (unsigned dnr);
 158 int create_and_write_cookie (char *file,
 159                              size_t file_size,
 160                              u_char *cookie_buf,
 161                              size_t sz);
 162 int verify_and_remove_cookies (int fd, int sock, int cookiesp);
 163 int replace_cookie(int xserver, int fd, char *filename, int cookiesp);
 164
 165 int suspicious_address (int sock, struct sockaddr *addr);
 166
 167 #define KX_PORT 2111
 168
 169 #define KX_OLD_VERSION "KXSERV.1"
 170 #define KX_VERSION "KXSERV.2"
 171
 172 #define COOKIE_TYPE "MIT-MAGIC-COOKIE-1"
 173
 174 enum { INIT = 0, ACK = 1, NEW_CONN = 2, ERROR = 3 };
 175
 176 enum kx_flags { PASSIVE = 1, KEEP_ALIVE = 2 };
 177
 178 typedef enum kx_flags kx_flags;
 179
 180 struct kx_context {
 181     int (*authenticate)(struct kx_context *kc, int s);
 182     int (*userok)(struct kx_context *kc, char *user);
 183     ssize_t (*read)(struct kx_context *kc,
 184                     int fd, void *buf, size_t len);
 185     ssize_t (*write)(struct kx_context *kc,
 186                      int fd, const void *buf, size_t len);
 187     int (*copy_encrypted)(struct kx_context *kc,
 188                           int fd1, int fd2);
 189     void (*destroy)(struct kx_context *kc);
 190     const char *host;
 191     const char *user;
 192     int port;
 193     int debug_flag;
 194     int keepalive_flag;
 195     int tcp_flag;
 196     struct sockaddr_storage __ss_this;
 197     struct sockaddr_storage __ss_that;
 198     struct sockaddr *thisaddr;
 199     struct sockaddr *thataddr;
 200     socklen_t thisaddr_len, thataddr_len;
 201     void *data;
 202 };
 203
 204 typedef struct kx_context kx_context;
 205
 206 void
 207 context_set (kx_context *kc, const char *host, const char *user, int port,
 208              int debug_flag, int keepalive_flag, int tcp_flag);
 209
 210 void
 211 context_destroy (kx_context *kc);
 212
 213 int
 214 context_authenticate (kx_context *kc, int s);
 215
 216 int
 217 context_userok (kx_context *kc, char *user);
 218
 219 ssize_t
 220 kx_read (kx_context *kc, int fd, void *buf, size_t len);
 221
 222 ssize_t
 223 kx_write (kx_context *kc, int fd, const void *buf, size_t len);
 224
 225 int
 226 copy_encrypted (kx_context *kc, int fd1, int fd2);
 227
 228 #ifdef KRB5
 229
 230 void
 231 krb5_make_context (kx_context *c);
 232
 233 int
 234 recv_v5_auth (kx_context *kc, int sock, u_char *buf);
 235
 236 #endif
 237
 238 void
 239 fatal (kx_context *kc, int fd, char *format, ...)
 240 #ifdef __GNUC__
 241 __attribute__ ((format (printf, 3, 4)))
 242 #endif
 243 ;
 244
 245 int
 246 kx_get_int(void *f, uint32_t *to, int size, int lsb);
 247
 248 int
 249 kx_put_int(uint32_t from, void *to, size_t rem, int size);