para.h

   1 /*
   2  * Copyright (C) 1997-2007 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 a and \a b */
  34 #define PARA_MIN(a,b) ((a) < (b) ? (a) : (b))
  35 /** compute the maximum of \a a and \a b */
  36 #define PARA_MAX(a,b) ((a) > (b) ? (a) : (b))
  37 /** compute the absolute value of \a a */
  38 #define PARA_ABS(a) ((a) > 0 ? (a) : -(a))
  39
  40 /** debug loglevel, gets really noisy */
  41 #define DEBUG 1
  42 /** still noisy, but won't fill your disk */
  43 #define INFO  2
  44 /** normal, but significant event */
  45 #define NOTICE 3
  46 /** unexpected event that can be handled */
  47 #define WARNING 4
  48 /** unhandled error condition */
  49 #define ERROR 5
  50 /** system might be unreliable */
  51 #define CRIT 6
  52 /** last message before exit */
  53 #define EMERG 7
  54
  55 /** Log messages with lower priority than that will not be compiled in. */
  56 #define COMPILE_TIME_LOGLEVEL 0
  57
  58 /** \cond */
  59 #if DEBUG > COMPILE_TIME_LOGLEVEL
  60 #define PARA_DEBUG_LOG(f,...) para_log(DEBUG, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
  61 #else
  62 #define PARA_DEBUG_LOG(...) do {;} while (0)
  63 #endif
  64
  65 #if INFO > COMPILE_TIME_LOGLEVEL
  66 #define PARA_INFO_LOG(f,...) para_log(INFO, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
  67 #else
  68 #define PARA_INFO_LOG(...) do {;} while (0)
  69 #endif
  70
  71 #if NOTICE > COMPILE_TIME_LOGLEVEL
  72 #define PARA_NOTICE_LOG(f,...) para_log(NOTICE, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
  73 #else
  74 #define PARA_NOTICE_LOG(...) do {;} while (0)
  75 #endif
  76
  77 #if WARNING > COMPILE_TIME_LOGLEVEL
  78 #define PARA_WARNING_LOG(f,...) para_log(WARNING, "%s: " f, __FUNCTION__, ##  __VA_ARGS__)
  79 #else
  80 #define PARA_WARNING_LOG(...) do {;} while (0)
  81 #endif
  82
  83 #if ERROR > COMPILE_TIME_LOGLEVEL
  84 #define PARA_ERROR_LOG(f,...) para_log(ERROR, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
  85 #else
  86 #define PARA_ERROR_LOG(...) do {;} while (0)
  87 #endif
  88
  89 #if CRIT > COMPILE_TIME_LOGLEVEL
  90 #define PARA_CRIT_LOG(f,...) para_log(CRIT, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
  91 #else
  92 #define PARA_CRIT_LOG(...) do {;} while (0)
  93 #endif
  94
  95 #if EMERG > COMPILE_TIME_LOGLEVEL
  96 #define PARA_EMERG_LOG(f,...) para_log(EMERG, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
  97 #else
  98 #define PARA_EMERG_LOG(...)
  99 #endif
 100 /** \endcond */
 101
 102 /**
 103  * define a standard log function that always writes to stderr
 104  *
 105  * \param loglevel_barrier If the loglevel of the current message
 106  * is less than that, the message is going to be ignored.
 107  *
 108  */
 109 #define INIT_STDERR_LOGGING(loglevel_barrier) \
 110         __printf_2_3 void para_log(int ll, const char* fmt,...) \
 111         { \
 112                 va_list argp; \
 113                 if (ll < loglevel_barrier) \
 114                         return; \
 115                 va_start(argp, fmt); \
 116                 vfprintf(stderr, fmt, argp); \
 117                 va_end(argp); \
 118         }
 119
 120 /** version text used by various commands if -V switch was given */
 121 #define VERSION_TEXT(prefix) "para_" prefix " " PACKAGE_VERSION "\n" \
 122         "Copyright (C) 2007 Andre Noll\n" \
 123         "This is free software with ABSOLUTELY NO WARRANTY." \
 124         " See COPYING for details.\n" \
 125         "Written by Andre Noll.\n" \
 126         "Report bugs to <maan@systemlinux.org>.\n"
 127
 128 /** print out \p VERSION_TEXT and exit if version flag was given */
 129 #define HANDLE_VERSION_FLAG(_prefix, _args_info_struct) \
 130         if (_args_info_struct.version_given) { \
 131                 printf("%s", VERSION_TEXT(_prefix)); \
 132                 exit(EXIT_SUCCESS); \
 133         }
 134 /** sent by para_server for commands that expect a data file */
 135 #define AWAITING_DATA_MSG "\nAwaiting Data."
 136 /** sent by para_server if authentication was successful */
 137 #define PROCEED_MSG "\nProceed.\n"
 138 /** length of the \p PROCEED_MSG string */
 139 #define PROCEED_MSG_LEN strlen(PROCEED_MSG)
 140 /** sent by para_client to indicate the end of the command line */
 141 #define EOC_MSG "\nEnd of Command."
 142 /** sent by para_client, followed by the decrypted challenge number */
 143 #define CHALLENGE_RESPONSE_MSG "challenge_response:"
 144
 145 /* exec */
 146 int para_exec_cmdline_pid(pid_t *pid, const char *cmdline, int *fds);
 147
 148 /* time */
 149 int tv_diff(const struct timeval *b, const struct timeval *a, struct timeval *diff);
 150 long unsigned tv2ms(const struct timeval*);
 151 void d2tv(double, struct timeval*);
 152 void tv_add(const struct timeval*, const struct timeval *, struct timeval *);
 153 void tv_scale(const unsigned long, const struct timeval *, struct timeval *);
 154 void tv_divide(const unsigned long divisor, const struct timeval *tv,
 155         struct timeval *result);
 156 int tv_convex_combination(const long a, const struct timeval *tv1,
 157                 const long b, const struct timeval *tv2,
 158                 struct timeval *result);
 159 void ms2tv(const long unsigned n, struct timeval *tv);
 160
 161 /* stat */
 162 enum {
 163         SI_STATUS_BAR,          SI_STATUS,              SI_NUM_PLAYED,
 164         SI_MTIME,               SI_LENGTH_MIN,          SI_LENGTH_SEC,
 165         SI_FILE_SIZE,           SI_STATUS_FLAGS,        SI_FORMAT,
 166         SI_SCORE,               SI_AUDIO_INFO1,         SI_AUDIO_INFO2,
 167         SI_AUDIO_INFO3,         SI_AFS_MODE,            SI_DBINFO2,
 168         SI_DBINFO3,             SI_DECODER_FLAGS,       SI_AUDIOD_STATUS,
 169         SI_PLAY_TIME,           SI_UPTIME,              SI_OFFSET,
 170         SI_LENGTH,              SI_STREAM_START,        SI_CURRENT_TIME,
 171         SI_AUDIOD_UPTIME,       SI_SELECTOR,            NUM_STAT_ITEMS
 172 };
 173
 174 int stat_item_valid(const char *item);
 175 int stat_line_valid(const char *);
 176 void stat_client_write(const char *msg, int itemnum);
 177 int stat_client_add(int fd, long unsigned mask);
 178 /** Loop over each status item. */
 179 #define FOR_EACH_STAT_ITEM(i) for (i = 0; i < NUM_STAT_ITEMS; i++)
 180
 181 __printf_2_3 void para_log(int, const char*, ...);
 182
 183 /**
 184  * Write a log message to a dynamically allocated string.
 185  *
 186  * \param fmt Usual format string.
 187  * \param p Result pointer.
 188  *
 189  * \sa printf(3). */
 190 #define PARA_VSPRINTF(fmt, p) \
 191 { \
 192         int n; \
 193         size_t size = 100; \
 194         p = para_malloc(size); \
 195         while (1) { \
 196                 va_list ap; \
 197                 /* Try to print in the allocated space. */ \
 198                 va_start(ap, fmt); \
 199                 n = vsnprintf(p, size, fmt, ap); \
 200                 va_end(ap); \
 201                 /* If that worked, return the string. */ \
 202                 if (n > -1 && n < size) \
 203                         break; \
 204                 /* Else try again with more space. */ \
 205                 if (n > -1) /* glibc 2.1 */ \
 206                         size = n + 1; /* precisely what is needed */ \
 207                 else /* glibc 2.0 */ \
 208                         size *= 2; /* twice the old size */ \
 209                 p = para_realloc(p, size); \
 210         } \
 211 }
 212
 213 /**
 214  *  Return a random non-negative integer in an interval.
 215  *
 216  * \param max Determines maximal possible return value.
 217  *
 218  * \return An integer between zero and \p max - 1, inclusively.
 219  */
 220 static inline int para_random(unsigned max)
 221 {
 222         return ((max + 0.0) * (rand() / (RAND_MAX + 1.0)));
 223 }
 224
 225 /** Round up x to a multiple of y */
 226 #define ROUND_UP(x, y) (((x) + (y - 1) / (y)) * (y))
 227
 228 /** Get the size of an array */
 229 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))