LXR toybox/toys/posix/logger.c

   1/* logger.c - Log messages.
   2 *
   3 * Copyright 2013 Ilya Kuzmich <ilya.kuzmich@gmail.com>
   4 *
   5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/logger.html
   6 *
   7 * Deviations from posix: specified manner and format, defined implementation.
   8
   9USE_LOGGER(NEWTOY(logger, "st:p:", TOYFLAG_USR|TOYFLAG_BIN))
  10
  11config LOGGER
  12  bool "logger"
  13  default y
  14  help
  15    usage: logger [-s] [-t TAG] [-p [FACILITY.]PRIORITY] [message...]
  16
  17    Log message (or stdin) to syslog.
  18
  19    -s  Also write message to stderr
  20    -t  Use TAG instead of username to identify message source
  21    -p  Specify PRIORITY with optional FACILITY. Default is "user.notice"
  22*/
  23
  24#define FOR_logger
  25#include "toys.h"
  26
  27GLOBALS(
  28  char *priority;
  29  char *ident;
  30)
  31
  32// find str in names[], accepting unambiguous short matches
  33// returns offset into array of match, or -1 if no match
  34int arrayfind(char *str, char *names[], int len)
  35{
  36  int try, i, matchlen = 0, found = -1, ambiguous = 1;
  37
  38  for (try = 0; try<len; try++) {
  39    for (i=0; ; i++) {
  40      if (!str[i]) {
  41        if (matchlen<i) found = try, ambiguous = 0;
  42        if (matchlen==i) ambiguous++;
  43        if (!names[try][i]) return try;
  44        break;
  45      }
  46      if (!names[try][i]) break;
  47      if (toupper(str[i]) != toupper(names[try][i])) break;
  48    }
  49  }
  50  return ambiguous ? -1 : found;
  51}
  52
  53void logger_main(void)
  54{
  55  int facility = LOG_USER, priority = LOG_NOTICE, len;
  56  char *s1, *s2, **arg,
  57    *priorities[] = {"emerg", "alert", "crit", "error", "warning", "notice",
  58                     "info", "debug"},
  59    *facilities[] = {"kern", "user", "mail", "daemon", "auth", "syslog",
  60                     "lpr", "news", "uucp", "cron", "authpriv", "ftp"};
  61
  62  if (!TT.ident) TT.ident = xstrdup(xgetpwuid(geteuid())->pw_name);
  63  if (toys.optflags & FLAG_p) {
  64    if (!(s1 = strchr(TT.priority, '.'))) s1 = TT.priority;
  65    else {
  66      *s1++ = len = 0;
  67      facility = arrayfind(TT.priority, facilities, ARRAY_LEN(facilities));
  68      if (facility == -1 && strncasecmp(TT.priority, "local", 5)) {
  69        facility = s1[5]-'0';
  70        if (facility>7 || s1[6]) facility = -1;
  71        if (facility>=0) facility += 16;
  72      }
  73      if (facility<0) error_exit("bad facility: %s", TT.priority);
  74      facility *= 8;
  75    }
  76
  77    priority = arrayfind(s1, priorities, ARRAY_LEN(priorities));
  78    if (priority<0) error_exit("bad priority: %s", s1);
  79  }
  80
  81  if (toys.optc) {
  82    for (len = 0, arg = toys.optargs; *arg; arg++) len += strlen(*arg)+1;
  83    s1 = s2 = xmalloc(len);
  84    for (arg = toys.optargs; *arg; arg++) {
  85      if (arg != toys.optargs) *s2++ = ' ';
  86      s2 = stpcpy(s2, *arg);
  87    }
  88  } else {
  89    toybuf[readall(0, toybuf, sizeof(toybuf)-1)] = 0;
  90    s1 = toybuf;
  91  }
  92
  93  openlog(TT.ident, LOG_PERROR*!!(toys.optflags&FLAG_s), facility);
  94  syslog(priority, "%s", s1);
  95  closelog();
  96}
  97