src/basic/syslog-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <syslog.h>
   4
   5 #include "sd-id128.h"
   6
   7 #include "glob-util.h"
   8 #include "hexdecoct.h"
   9 #include "macro.h"
  10 #include "path-util.h"
  11 #include "string-table.h"
  12 #include "syslog-util.h"
  13 #include "unit-name.h"
  14
  15 int syslog_parse_priority(const char **p, int *priority, bool with_facility) {
  16         int a = 0, b = 0, c = 0;
  17         const char *end;
  18         size_t k;
  19
  20         assert(p);
  21         assert(*p);
  22         assert(priority);
  23
  24         if ((*p)[0] != '<')
  25                 return 0;
  26
  27         end = strchr(*p, '>');
  28         if (!end)
  29                 return 0;
  30
  31         k = end - *p;
  32         assert(k > 0);
  33
  34         if (k == 2)
  35                 c = undecchar((*p)[1]);
  36         else if (k == 3) {
  37                 b = undecchar((*p)[1]);
  38                 c = undecchar((*p)[2]);
  39         } else if (k == 4) {
  40                 a = undecchar((*p)[1]);
  41                 b = undecchar((*p)[2]);
  42                 c = undecchar((*p)[3]);
  43         } else
  44                 return 0;
  45
  46         if (a < 0 || b < 0 || c < 0 ||
  47             (!with_facility && (a || b || c > 7)))
  48                 return 0;
  49
  50         if (with_facility)
  51                 *priority = a*100 + b*10 + c;
  52         else
  53                 *priority = (*priority & LOG_FACMASK) | c;
  54
  55         *p += k + 1;
  56         return 1;
  57 }
  58
  59 static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
  60         [LOG_FAC(LOG_KERN)] = "kern",
  61         [LOG_FAC(LOG_USER)] = "user",
  62         [LOG_FAC(LOG_MAIL)] = "mail",
  63         [LOG_FAC(LOG_DAEMON)] = "daemon",
  64         [LOG_FAC(LOG_AUTH)] = "auth",
  65         [LOG_FAC(LOG_SYSLOG)] = "syslog",
  66         [LOG_FAC(LOG_LPR)] = "lpr",
  67         [LOG_FAC(LOG_NEWS)] = "news",
  68         [LOG_FAC(LOG_UUCP)] = "uucp",
  69         [LOG_FAC(LOG_CRON)] = "cron",
  70         [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
  71         [LOG_FAC(LOG_FTP)] = "ftp",
  72         [LOG_FAC(LOG_LOCAL0)] = "local0",
  73         [LOG_FAC(LOG_LOCAL1)] = "local1",
  74         [LOG_FAC(LOG_LOCAL2)] = "local2",
  75         [LOG_FAC(LOG_LOCAL3)] = "local3",
  76         [LOG_FAC(LOG_LOCAL4)] = "local4",
  77         [LOG_FAC(LOG_LOCAL5)] = "local5",
  78         [LOG_FAC(LOG_LOCAL6)] = "local6",
  79         [LOG_FAC(LOG_LOCAL7)] = "local7"
  80 };
  81
  82 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_facility_unshifted, int, LOG_FAC(~0));
  83
  84 bool log_facility_unshifted_is_valid(int facility) {
  85         return facility >= 0 && facility <= LOG_FAC(~0);
  86 }
  87
  88 static const char *const log_level_table[] = {
  89         [LOG_EMERG] = "emerg",
  90         [LOG_ALERT] = "alert",
  91         [LOG_CRIT] = "crit",
  92         [LOG_ERR] = "err",
  93         [LOG_WARNING] = "warning",
  94         [LOG_NOTICE] = "notice",
  95         [LOG_INFO] = "info",
  96         [LOG_DEBUG] = "debug"
  97 };
  98
  99 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_level, int, LOG_DEBUG);
 100
 101 bool log_level_is_valid(int level) {
 102         return level >= 0 && level <= LOG_DEBUG;
 103 }
 104
 105 /* The maximum size for a log namespace length. This is the file name size limit 255 minus the size of a
 106  * formatted machine ID minus a separator char */
 107 #define LOG_NAMESPACE_MAX (NAME_MAX - (SD_ID128_STRING_MAX - 1) - 1)
 108
 109 bool log_namespace_name_valid(const char *s) {
 110         /* Let's make sure the namespace fits in a filename that is prefixed with the machine ID and a dot
 111          * (so that /var/log/journal/<machine-id>.<namespace> can be created based on it). Also make sure it
 112          * is suitable as unit instance name, and does not contain fishy characters. */
 113
 114         if (!filename_is_valid(s))
 115                 return false;
 116
 117         if (strlen(s) > LOG_NAMESPACE_MAX)
 118                 return false;
 119
 120         if (!unit_instance_is_valid(s))
 121                 return false;
 122
 123         if (!string_is_safe(s))
 124                 return false;
 125
 126         /* Let's avoid globbing for now */
 127         if (string_is_glob(s))
 128                 return false;
 129
 130         return true;
 131 }