src/src/mytypes.h

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8
   9 /* This header file contains type definitions and macros that I use as
  10 "standard" in the code of Exim and its utilities. Make it idempotent because
  11 local_scan.h includes it and exim.h includes them both (to get this earlier). */
  12
  13 #ifndef MYTYPES_H
  14 #define MYTYPES_H
  15
  16 # include <string.h>
  17
  18 #ifndef FALSE
  19 # define FALSE         0
  20 #endif
  21
  22 #ifndef TRUE
  23 # define TRUE          1
  24 #endif
  25
  26 #ifndef TRUE_UNSET
  27 # define TRUE_UNSET    2
  28 #endif
  29
  30
  31 /* If gcc is being used to compile Exim, we can use its facility for checking
  32 the arguments of printf-like functions. This is done by a macro. */
  33
  34 #if defined(__GNUC__) || defined(__clang__)
  35 # define PRINTF_FUNCTION(A,B)   __attribute__((format(printf,A,B)))
  36 # define ARG_UNUSED             __attribute__((__unused__))
  37 # define WARN_UNUSED_RESULT     __attribute__((__warn_unused_result__))
  38 # define ALLOC                  __attribute__((malloc))
  39 # define ALLOC_SIZE(A)          __attribute__((alloc_size(A)))
  40 # define NORETURN               __attribute__((noreturn))
  41 #else
  42 # define PRINTF_FUNCTION(A,B)
  43 # define ARG_UNUSED             /**/
  44 # define WARN_UNUSED_RESULT     /**/
  45 # define ALLOC                  /**/
  46 # define ALLOC_SIZE(A)          /**/
  47 # define NORETURN               /**/
  48 #endif
  49
  50 #ifdef WANT_DEEPER_PRINTF_CHECKS
  51 # define ALMOST_PRINTF(A, B) PRINTF_FUNCTION(A, B)
  52 #else
  53 # define ALMOST_PRINTF(A, B)
  54 #endif
  55
  56
  57 /* Some operating systems (naughtily, imo) include a definition for "uchar" in
  58 the standard header files, so we use "uschar". Solaris has u_char in
  59 sys/types.h. This is just a typing convenience, of course. */
  60
  61 typedef unsigned char uschar;
  62 typedef unsigned BOOL;
  63 /* We also have SIGNAL_BOOL, which requires signal.h be included, so is defined
  64 elsewhere */
  65
  66
  67 /* These macros save typing for the casting that is needed to cope with the
  68 mess that is "char" in ISO/ANSI C. Having now been bitten enough times by
  69 systems where "char" is actually signed, I've converted Exim to use entirely
  70 unsigned chars, except in a few special places such as arguments that are
  71 almost always literal strings. */
  72
  73 #define CS   (char *)
  74 #define CCS  (const char *)
  75 #define CSS  (char **)
  76 #define US   (unsigned char *)
  77 #define CUS  (const unsigned char *)
  78 #define USS  (unsigned char **)
  79 #define CUSS (const unsigned char **)
  80 #define CCSS (const char **)
  81
  82 /* The C library string functions expect "char *" arguments. Use macros to
  83 avoid having to write a cast each time. We do this for string and file
  84 functions that are called quite often; for other calls to external libraries
  85 (which are on the whole special-purpose) we just use individual casts. */
  86
  87 #define Uatoi(s)           atoi(CCS(s))
  88 #define Uatol(s)           atol(CCS(s))
  89 #define Uchdir(s)          chdir(CCS(s))
  90 #define Uchmod(s,n)        chmod(CCS(s),n)
  91 #define Ufgets(b,n,f)      fgets(CS(b),n,f)
  92 #define Ufopen(s,t)        fopen(CCS(s),CCS(t))
  93 #define Ulink(s,t)         link(CCS(s),CCS(t))
  94 #define Ulstat(s,t)        lstat(CCS(s),t)
  95
  96 #ifdef O_BINARY                                        /* This is for Cygwin,  */
  97 #define Uopen(s,n,m)       open(CCS(s),(n)|O_BINARY,m) /* where all files must */
  98 #else                                                  /* be opened as binary  */
  99 #define Uopen(s,n,m)       open(CCS(s),n,m)            /* to avoid problems    */
 100 #endif                                                 /* with CRLF endings.   */
 101 #define Uread(f,b,l)       read(f,CS(b),l)
 102 #define Urename(s,t)       rename(CCS(s),CCS(t))
 103 #define Ustat(s,t)         stat(CCS(s),t)
 104 #define Ustrcat(s,t)       __Ustrcat(s, CUS(t), __FUNCTION__, __LINE__)
 105 #define Ustrchr(s,n)       US strchr(CCS(s),n)
 106 #define CUstrchr(s,n)      CUS strchr(CCS(s),n)
 107 #define CUstrerror(n)      CUS strerror(n)
 108 #define Ustrcmp(s,t)       strcmp(CCS(s),CCS(t))
 109 #define Ustrcpy(s,t)       __Ustrcpy(s, CUS(t), __FUNCTION__, __LINE__)
 110 #define Ustrcpy_nt(s,t)    strcpy(CS s, CCS t)          /* no taint check */
 111 #define Ustrcspn(s,t)      strcspn(CCS(s),CCS(t))
 112 #define Ustrftime(s,m,f,t) strftime(CS(s),m,f,t)
 113 #define Ustrlen(s)         (int)strlen(CCS(s))
 114 #define Ustrncat(s,t,n)    __Ustrncat(s, CUS(t),n, __FUNCTION__, __LINE__)
 115 #define Ustrncmp(s,t,n)    strncmp(CCS(s),CCS(t),n)
 116 #define Ustrncpy(s,t,n)    __Ustrncpy(s, CUS(t),n, __FUNCTION__, __LINE__)
 117 #define Ustrncpy_nt(s,t,n) strncpy(CS s, CCS t, n)      /* no taint check */
 118 #define Ustrpbrk(s,t)      strpbrk(CCS(s),CCS(t))
 119 #define Ustrrchr(s,n)      US strrchr(CCS(s),n)
 120 #define CUstrrchr(s,n)     CUS strrchr(CCS(s),n)
 121 #define Ustrspn(s,t)       strspn(CCS(s),CCS(t))
 122 #define Ustrstr(s,t)       US strstr(CCS(s),CCS(t))
 123 #define CUstrstr(s,t)      CUS strstr(CCS(s),CCS(t))
 124 #define Ustrtod(s,t)       strtod(CCS(s),CSS(t))
 125 #define Ustrtol(s,t,b)     strtol(CCS(s),CSS(t),b)
 126 #define Ustrtoul(s,t,b)    strtoul(CCS(s),CSS(t),b)
 127 #define Uunlink(s)         unlink(CCS(s))
 128
 129 extern void die_tainted(const uschar *, const uschar *, int);
 130
 131 /* Predicate: if an address is in a tainted pool.
 132 By extension, a variable pointing to this address is tainted.
 133 */
 134
 135 static inline BOOL
 136 is_tainted(const void * p)
 137 {
 138 #if defined(COMPILE_UTILITY) || defined(MACRO_PREDEF)
 139 return FALSE;
 140
 141 #elif !defined(TAINT_CHECK_FAST)
 142 extern BOOL is_tainted_fn(const void *);
 143 return is_tainted_fn(p);
 144
 145 #else
 146 extern void * tainted_base, * tainted_top;
 147 return p >= tainted_base && p < tainted_top;
 148 #endif
 149 }
 150
 151 static inline uschar * __Ustrcat(uschar * dst, const uschar * src, const char * func, int line)
 152 {
 153 #if !defined(COMPILE_UTILITY) && !defined(MACRO_PREDEF)
 154 if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrcat", CUS func, line);
 155 #endif
 156 return US strcat(CS dst, CCS src);
 157 }
 158 static inline uschar * __Ustrcpy(uschar * dst, const uschar * src, const char * func, int line)
 159 {
 160 #if !defined(COMPILE_UTILITY) && !defined(MACRO_PREDEF)
 161 if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrcpy", CUS func, line);
 162 #endif
 163 return US strcpy(CS dst, CCS src);
 164 }
 165 static inline uschar * __Ustrncat(uschar * dst, const uschar * src, size_t n, const char * func, int line)
 166 {
 167 #if !defined(COMPILE_UTILITY) && !defined(MACRO_PREDEF)
 168 if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrncat", CUS func, line);
 169 #endif
 170 return US strncat(CS dst, CCS src, n);
 171 }
 172 static inline uschar * __Ustrncpy(uschar * dst, const uschar * src, size_t n, const char * func, int line)
 173 {
 174 #if !defined(COMPILE_UTILITY) && !defined(MACRO_PREDEF)
 175 if (!is_tainted(dst) && is_tainted(src)) die_tainted(US"Ustrncpy", CUS func, line);
 176 #endif
 177 return US strncpy(CS dst, CCS src, n);
 178 }
 179 /*XXX will likely need unchecked copy also */
 180
 181 #endif
 182 /* End of mytypes.h */