mdw@git.distorted.org.uk Git - userv-utils/blob - ipif/forwarder.h

   1 /*
   2  */
   3
   4 #ifndef MECHS_H
   5 #define MECHS_H
   6
   7 #include <stdio.h>
   8 #include <time.h>
   9 #include <sys/utsname.h>
  10
  11 #include "automech.h"
  12
  13 struct buffer {
  14   unsigned char *base;
  15   unsigned char *start;
  16   size_t size;
  17 };
  18
  19 struct mechdata;
  20
  21 typedef void mes_functype(struct mechdata **md_r, int *maxprefix_io, int *maxsuffix_io);
  22 typedef void mds_functype(struct mechdata **md_r);
  23
  24 typedef void menc_functype(struct mechdata *md, struct buffer*);
  25 typedef const char *mdec_functype(struct mechdata *md, struct buffer*);
  26
  27 struct mechanism {
  28   const char *name;
  29   mes_functype *encsetup;
  30   mds_functype *decsetup;
  31   menc_functype *encode;
  32   mdec_functype *decode;
  33 };
  34
  35 extern const struct mechanism *const mechanismlists[];
  36
  37 /* setup function may call getarg_xxx functions and then
  38  * reads/writes key material to/from fd
  39  *
  40  * setup_in function may increase maxprefix and maxsuffix
  41  * code functions modify buffer in place
  42  * decode function returns message to print
  43  */
  44
  45 const char *getarg_string(void);
  46 unsigned long getarg_ulong(void);
  47
  48 #define PROGRAM "udptunnel-forwarder"
  49 extern char programid[];
  50
  51 void *buf_append(struct buffer *buf, size_t amount);
  52 void *buf_prepend(struct buffer *buf, size_t amount);
  53 void *buf_unappend(struct buffer *buf, size_t amount); /* may give 0 */
  54 void *buf_unprepend(struct buffer *buf, size_t amount); /* may give 0 */
  55
  56 void sysfail(const char *msg);
  57 void fail(const char *msg);
  58 void sysdiag(const char *msg);
  59 void diag(const char *msg);
  60
  61 extern const char *const *argv;
  62
  63 time_t now(void);
  64 void *xmalloc(size_t sz);
  65 void get_random(void *ptr, size_t sz);
  66 void random_key(void *ptr, size_t sz);
  67 void write_must(int fd, const void *p_in, int sz, const char *what);
  68 void read_must(int fd, void *p_in, int sz, const char *what);
  69
  70 void arg_assert_fail(const char *msg);
  71 #define arg_assert(v)  (v ? (void)0 : arg_assert_fail(#v))
  72
  73 #define XMALLOC(variable) ((variable)= xmalloc(sizeof(*(variable))))
  74
  75 #define BUF_UNSOMEEND(var,buf,sz,whichend) \
  76  do { var= whichend(buf,sz); if (!var) return "message truncated"; } while(0)
  77 #define BUF_UNAPPEND(var,buf,sz) BUF_UNSOMEEND(var,buf,sz,buf_unappend)
  78 #define BUF_UNPREPEND(var,buf,sz) BUF_UNSOMEEND(var,buf,sz,buf_unprepend)
  79
  80 #define STANDARD_MECHANISMLIST(mechstring,filename) \
  81  const struct mechanism mechlist_##filename []= {    \
  82    STANDARD_MECHANISM(mechstring,filename)          \
  83    { 0 }                                            \
  84  };
  85
  86 #define STANDARD_MECHANISM(mechstring,mechname) \
  87  { mechstring, mes_##mechname, mds_##mechname, menc_##mechname, mdec_##mechname },
  88
  89 #endif