para.h

   1 /*
   2  * Copyright (C) 1997-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file para.h global paraslash definitions */
   8
   9 #include "config.h"
  10
  11 #include <sys/stat.h>
  12 #include <fcntl.h>
  13 #include <sys/wait.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <time.h> /* time(), localtime() */
  17 #include <unistd.h>
  18 #include <errno.h>
  19 #include <limits.h>
  20 #include <stdarg.h>
  21 #include <ctype.h>
  22 #include <netinet/in.h>
  23 #include <arpa/inet.h>
  24 #include <sys/socket.h>
  25 #include <sys/un.h> /* needed by create_pf_socket */
  26 #include <string.h>
  27 #include <assert.h>
  28 #include "gcc-compat.h"
  29
  30 /** used in various contexts */
  31 #define MAXLINE 255
  32
  33 /** Compute the minimum of \a x and \a y. */
  34 #define PARA_MIN(x, y) ({ \
  35         typeof(x) _min1 = (x); \
  36         typeof(y) _min2 = (y); \
  37         (void) (&_min1 == &_min2); \
  38         _min1 < _min2 ? _min1 : _min2; })
  39
  40 /** Compute the maximum of \a x and \a y. */
  41 #define PARA_MAX(x, y) ({ \
  42         typeof(x) _max1 = (x); \
  43         typeof(y) _max2 = (y); \
  44         (void) (&_max1 == &_max2); \
  45         _max1 < _max2 ? _max2 : _max1; })
  46
  47 /** Compute the absolute value of \a x. */
  48 #define PARA_ABS(x) ({ \
  49         typeof(x) _x = (x); \
  50         _x > 0? _x : -_x; })
  51
  52 /** Debug loglevel, gets really noisy. */
  53 #define LL_DEBUG 0
  54 /** Still noisy, but won't fill your disk. */
  55 #define LL_INFO  1
  56 /** Normal, but significant event. */
  57 #define LL_NOTICE 2
  58 /** Unexpected event that can be handled. */
  59 #define LL_WARNING 3
  60 /** Unhandled error condition. */
  61 #define LL_ERROR 4
  62 /** System might be unreliable. */
  63 #define LL_CRIT 5
  64 /** Last message before exit. */
  65 #define LL_EMERG 6
  66 /** Number of all loglevels. */
  67 #define NUM_LOGLEVELS 7
  68
  69 /** Log messages with lower priority than that will not be compiled in. */
  70 #define COMPILE_TIME_LOGLEVEL 0
  71
  72 /** \cond */
  73 #if LL_DEBUG >= COMPILE_TIME_LOGLEVEL
  74 #define PARA_DEBUG_LOG(f,...) para_log(LL_DEBUG, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
  75 #else
  76 #define PARA_DEBUG_LOG(...) do {;} while (0)
  77 #endif
  78
  79 #if LL_INFO >= COMPILE_TIME_LOGLEVEL
  80 #define PARA_INFO_LOG(f,...) para_log(LL_INFO, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
  81 #else
  82 #define PARA_INFO_LOG(...) do {;} while (0)
  83 #endif
  84
  85 #if LL_NOTICE >= COMPILE_TIME_LOGLEVEL
  86 #define PARA_NOTICE_LOG(f,...) para_log(LL_NOTICE, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
  87 #else
  88 #define PARA_NOTICE_LOG(...) do {;} while (0)
  89 #endif
  90
  91 #if LL_WARNING >= COMPILE_TIME_LOGLEVEL
  92 #define PARA_WARNING_LOG(f,...) para_log(LL_WARNING, "%s: " f, __FUNCTION__, ##  __VA_ARGS__)
  93 #else
  94 #define PARA_WARNING_LOG(...) do {;} while (0)
  95 #endif
  96
  97 #if LL_ERROR >= COMPILE_TIME_LOGLEVEL
  98 #define PARA_ERROR_LOG(f,...) para_log(LL_ERROR, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
  99 #else
 100 #define PARA_ERROR_LOG(...) do {;} while (0)
 101 #endif
 102
 103 #if LL_CRIT >= COMPILE_TIME_LOGLEVEL
 104 #define PARA_CRIT_LOG(f,...) para_log(LL_CRIT, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
 105 #else
 106 #define PARA_CRIT_LOG(...) do {;} while (0)
 107 #endif
 108
 109 #if LL_EMERG >= COMPILE_TIME_LOGLEVEL
 110 #define PARA_EMERG_LOG(f,...) para_log(LL_EMERG, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
 111 #else
 112 #define PARA_EMERG_LOG(...)
 113 #endif
 114 /** \endcond */
 115
 116 /**
 117  * define a standard log function that always writes to stderr
 118  *
 119  * \param loglevel_barrier If the loglevel of the current message
 120  * is less than that, the message is going to be ignored.
 121  *
 122  */
 123 #define INIT_STDERR_LOGGING(loglevel_barrier) \
 124         __printf_2_3 void para_log(int ll, const char* fmt,...) \
 125         { \
 126                 va_list argp; \
 127                 if (ll < loglevel_barrier) \
 128                         return; \
 129                 va_start(argp, fmt); \
 130                 vfprintf(stderr, fmt, argp); \
 131                 va_end(argp); \
 132         }
 133
 134 /** version text used by various commands if -V switch was given */
 135 #define VERSION_TEXT(prefix) "para_" prefix " " PACKAGE_VERSION " (" CODENAME ")" "\n" \
 136         "Copyright (C) 2009 Andre Noll\n" \
 137         "This is free software with ABSOLUTELY NO WARRANTY." \
 138         " See COPYING for details.\n" \
 139         "Written by Andre Noll.\n" \
 140         "Report bugs to <maan@systemlinux.org>.\n"
 141
 142 /** print out \p VERSION_TEXT and exit if version flag was given */
 143 #define HANDLE_VERSION_FLAG(_prefix, _args_info_struct) \
 144         if (_args_info_struct.version_given) { \
 145                 printf("%s", VERSION_TEXT(_prefix)); \
 146                 exit(EXIT_SUCCESS); \
 147         }
 148 /** sent by para_server for commands that expect a data file */
 149 #define AWAITING_DATA_MSG "\nAwaiting Data."
 150 /** sent by para_server if authentication was successful */
 151 #define PROCEED_MSG "\nProceed.\n"
 152 /** length of the \p PROCEED_MSG string */
 153 #define PROCEED_MSG_LEN strlen(PROCEED_MSG)
 154 /** sent by para_client to indicate the end of the command line */
 155 #define EOC_MSG "\nEnd of Command."
 156 /** sent by para_client, followed by the decrypted challenge number */
 157 #define CHALLENGE_RESPONSE_MSG "challenge_response:"
 158
 159 /* exec */
 160 int para_exec_cmdline_pid(pid_t *pid, const char *cmdline, int *fds);
 161
 162 /* time */
 163 int tv_diff(const struct timeval *b, const struct timeval *a, struct timeval *diff);
 164 long unsigned tv2ms(const struct timeval*);
 165 void d2tv(double, struct timeval*);
 166 void tv_add(const struct timeval*, const struct timeval *, struct timeval *);
 167 void tv_scale(const unsigned long, const struct timeval *, struct timeval *);
 168 void tv_divide(const unsigned long divisor, const struct timeval *tv,
 169         struct timeval *result);
 170 int tv_convex_combination(const long a, const struct timeval *tv1,
 171                 const long b, const struct timeval *tv2,
 172                 struct timeval *result);
 173 void ms2tv(const long unsigned n, struct timeval *tv);
 174 void compute_chunk_time(long unsigned chunk_num,
 175                 struct timeval *chunk_tv, struct timeval *stream_start,
 176                 struct timeval *result);
 177
 178 /** The enum of all status items. */
 179 enum status_items {STATUS_ITEM_ENUM NUM_STAT_ITEMS};
 180 extern const char *status_item_list[];
 181 /** Loop over each status item. */
 182 #define FOR_EACH_STATUS_ITEM(i) for (i = 0; i < NUM_STAT_ITEMS; i++)
 183 int stat_item_valid(const char *item);
 184 int stat_line_valid(const char *);
 185 void stat_client_write(const char *msg, int itemnum);
 186 int stat_client_add(int fd, long unsigned mask);
 187
 188 __printf_2_3 void para_log(int, const char*, ...);
 189
 190 /**
 191  * Write a log message to a dynamically allocated string.
 192  *
 193  * \param fmt Usual format string.
 194  * \param p Result pointer.
 195  *
 196  * \sa printf(3). */
 197 #define PARA_VSPRINTF(fmt, p) \
 198 { \
 199         int n; \
 200         size_t size = 100; \
 201         p = para_malloc(size); \
 202         while (1) { \
 203                 va_list ap; \
 204                 /* Try to print in the allocated space. */ \
 205                 va_start(ap, fmt); \
 206                 n = vsnprintf(p, size, fmt, ap); \
 207                 va_end(ap); \
 208                 /* If that worked, return the string. */ \
 209                 if (n > -1 && n < size) \
 210                         break; \
 211                 /* Else try again with more space. */ \
 212                 if (n > -1) /* glibc 2.1 */ \
 213                         size = n + 1; /* precisely what is needed */ \
 214                 else /* glibc 2.0 */ \
 215                         size *= 2; /* twice the old size */ \
 216                 p = para_realloc(p, size); \
 217         } \
 218 }
 219
 220 /**
 221  *  Return a random non-negative integer in an interval.
 222  *
 223  * \param max Determines maximal possible return value.
 224  *
 225  * \return An integer between zero and \p max - 1, inclusively.
 226  */
 227 static inline long int para_random(unsigned max)
 228 {
 229         return ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
 230 }
 231
 232 /** Round up x to a multiple of y */
 233 #define ROUND_UP(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
 234
 235
 236 /** Get the size of an array */
 237 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 238
 239 /**
 240  * Wrapper for isspace.
 241  * NetBSD needs this.
 242  */
 243 /*
 244  * The values should be cast to an unsigned char first, then to int.
 245  * Why? Because the isdigit (as do all other is/to functions/macros)
 246  * expect a number from 0 upto and including 255 as their (int) argument.
 247  * Because char is signed on most systems, casting it to int immediately
 248  * gives the functions an argument between -128 and 127 (inclusive),
 249  * which they will use as an array index, and which will thus fail
 250  * horribly for characters which have their most significant bit set.
 251  */
 252 #define para_isspace(c) isspace((int)(unsigned char)(c))
 253
 254 /** Data that indicates an eof-condition for a fec-encoded stream. */
 255 #define FEC_EOF_PACKET "\xec\x0d\xcc\xfe\0\0\0\0" \
 256         "\0\0\0\0\0\0\0\0" "\0\0\0\0\0\0\0\0" "\0\0\0\0\0\0\0\0"
 257 #define FEC_EOF_PACKET_LEN 32