Home | History | Annotate | Download | only in include
      1 /*
      2  * include/cm.h
      3  *
      4  * Copyright 2002 by the Massachusetts Institute of Technology.
      5  * All Rights Reserved.
      6  *
      7  * Export of this software from the United States of America may
      8  *   require a specific license from the United States Government.
      9  *   It is the responsibility of any person or organization contemplating
     10  *   export to obtain such a license before exporting.
     11  *
     12  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
     13  * distribute this software and its documentation for any purpose and
     14  * without fee is hereby granted, provided that the above copyright
     15  * notice appear in all copies and that both that copyright notice and
     16  * this permission notice appear in supporting documentation, and that
     17  * the name of M.I.T. not be used in advertising or publicity pertaining
     18  * to distribution of the software without specific, written prior
     19  * permission.  Furthermore if you modify this software you must label
     20  * your software as modified software and not distribute it in such a
     21  * fashion that it might be confused with the original M.I.T. software.
     22  * M.I.T. makes no representations about the suitability of
     23  * this software for any purpose.  It is provided "as is" without express
     24  * or implied warranty.
     25  */
     26 
     27 /* Since fd_set is large on some platforms (8K on AIX 5.2), this
     28    probably shouldn't be allocated in automatic storage.  */
     29 struct select_state {
     30     int max, nfds;
     31     fd_set rfds, wfds, xfds;
     32     struct timeval end_time;	/* magic: tv_sec==0 => never time out */
     33 };
     34 
     35 
     36 /* Select state flags.  */
     37 #define SSF_READ	0x01
     38 #define SSF_WRITE	0x02
     39 #define SSF_EXCEPTION	0x04
     40 
     41 
     42 static const char *const state_strings[] = {
     43     "INITIALIZING", "CONNECTING", "WRITING", "READING", "FAILED"
     44 };
     45 
     46 
     47 /* connection states */
     48 enum conn_states { INITIALIZING, CONNECTING, WRITING, READING, FAILED };
     49 struct incoming_krb5_message {
     50     size_t bufsizebytes_read;
     51     size_t bufsize;
     52     char *buf;
     53     char *pos;
     54     unsigned char bufsizebytes[4];
     55     size_t n_left;
     56 };
     57 struct conn_state {
     58     SOCKET fd;
     59     krb5_error_code err;
     60     enum conn_states state;
     61     unsigned int is_udp : 1;
     62     int (*service)(struct conn_state *, struct select_state *, int);
     63     struct addrinfo *addr;
     64     struct {
     65 	struct {
     66 	    sg_buf sgbuf[2];
     67 	    sg_buf *sgp;
     68 	    int sg_count;
     69 	    unsigned char msg_len_buf[4];
     70 	} out;
     71 	struct incoming_krb5_message in;
     72     } x;
     73 };
     74 
     75 struct sendto_callback_info {
     76     int  (*pfn_callback) (struct conn_state *, void *, krb5_data *);
     77     void (*pfn_cleanup)  (void *, krb5_data *);
     78     void  *context;
     79 };
     80 
     81 
     82 krb5_error_code krb5int_cm_call_select (const struct select_state *,
     83 					struct select_state *, int *);
     84