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 *p, *t;
  29)
  30
  31// find str in names[], accepting unambiguous short matches
  32// returns offset into array of match, or -1 if no match
  33int arrayfind(char *str, char *names[], int len)
  34{
  35  int try, i, matchlen = 0, found = -1, ambiguous = 1;
  36
  37  for (try = 0; try<len; try++) {
  38    for (i=0; ; i++) {
  39      if (!str[i]) {
  40        if (matchlen<i) found = try, ambiguous = 0;
  41        if (matchlen==i) ambiguous++;
  42        if (!names[try][i]) return try;
  43        break;
  44      }
  45      if (!names[try][i]) break;
  46      if (toupper(str[i]) != toupper(names[try][i])) break;
  47    }
  48  }
  49  return ambiguous ? -1 : found;
  50}
  51
  52void logger_main(void)
  53{
  54  int facility = LOG_USER, priority = LOG_NOTICE, len;
  55  char *s1, *s2, **arg,
  56    *priorities[] = {"emerg", "alert", "crit", "error", "warning", "notice",
  57                     "info", "debug"},
  58    *facilities[] = {"kern", "user", "mail", "daemon", "auth", "syslog",
  59                     "lpr", "news", "uucp", "cron", "authpriv", "ftp"};
  60
  61  if (!TT.t) TT.t = xstrdup(xgetpwuid(geteuid())->pw_name);
  62  if (toys.optflags & FLAG_p) {
  63    if (!(s1 = strchr(TT.p, '.'))) s1 = TT.p;
  64    else {
  65      *s1++ = len = 0;
  66      facility = arrayfind(TT.p, facilities, ARRAY_LEN(facilities));
  67      if (facility == -1 && strncasecmp(TT.p, "local", 5)) {
  68        facility = s1[5]-'0';
  69        if (facility>7 || s1[6]) facility = -1;
  70        if (facility>=0) facility += 16;
  71      }
  72      if (facility<0) error_exit("bad facility: %s", TT.p);
  73      facility *= 8;
  74    }
  75
  76    priority = arrayfind(s1, priorities, ARRAY_LEN(priorities));
  77    if (priority<0) error_exit("bad priority: %s", s1);
  78  }
  79
  80  if (toys.optc) {
  81    for (len = 0, arg = toys.optargs; *arg; arg++) len += strlen(*arg)+1;
  82    s1 = s2 = xmalloc(len);
  83    for (arg = toys.optargs; *arg; arg++) {
  84      if (arg != toys.optargs) *s2++ = ' ';
  85      s2 = stpcpy(s2, *arg);
  86    }
  87  } else {
  88    toybuf[readall(0, toybuf, sizeof(toybuf)-1)] = 0;
  89    s1 = toybuf;
  90  }
  91
  92  openlog(TT.t, LOG_PERROR*!!(toys.optflags&FLAG_s), facility);
  93  syslog(priority, "%s", s1);
  94  closelog();
  95}
  96