src/basic/proc-cmdline.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <stdbool.h>
  21 #include <stddef.h>
  22 #include <string.h>
  23
  24 #include "alloc-util.h"
  25 #include "extract-word.h"
  26 #include "fileio.h"
  27 #include "macro.h"
  28 #include "parse-util.h"
  29 #include "proc-cmdline.h"
  30 #include "process-util.h"
  31 //#include "special.h"
  32 #include "string-util.h"
  33 #include "util.h"
  34 #include "virt.h"
  35
  36 int proc_cmdline(char **ret) {
  37         assert(ret);
  38
  39         if (detect_container() > 0)
  40                 return get_process_cmdline(1, 0, false, ret);
  41         else
  42                 return read_one_line_file("/proc/cmdline", ret);
  43 }
  44
  45 int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value)) {
  46         _cleanup_free_ char *line = NULL;
  47         const char *p;
  48         int r;
  49
  50         assert(parse_item);
  51
  52         r = proc_cmdline(&line);
  53         if (r < 0)
  54                 return r;
  55
  56         p = line;
  57         for (;;) {
  58                 _cleanup_free_ char *word = NULL;
  59                 char *value = NULL;
  60
  61                 r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
  62                 if (r < 0)
  63                         return r;
  64                 if (r == 0)
  65                         break;
  66
  67                 /* Filter out arguments that are intended only for the
  68                  * initrd */
  69                 if (!in_initrd() && startswith(word, "rd."))
  70                         continue;
  71
  72                 value = strchr(word, '=');
  73                 if (value)
  74                         *(value++) = 0;
  75
  76                 r = parse_item(word, value);
  77                 if (r < 0)
  78                         return r;
  79         }
  80
  81         return 0;
  82 }
  83
  84 int get_proc_cmdline_key(const char *key, char **value) {
  85         _cleanup_free_ char *line = NULL, *ret = NULL;
  86         bool found = false;
  87         const char *p;
  88         int r;
  89
  90         assert(key);
  91
  92         r = proc_cmdline(&line);
  93         if (r < 0)
  94                 return r;
  95
  96         p = line;
  97         for (;;) {
  98                 _cleanup_free_ char *word = NULL;
  99                 const char *e;
 100
 101                 r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
 102                 if (r < 0)
 103                         return r;
 104                 if (r == 0)
 105                         break;
 106
 107                 /* Filter out arguments that are intended only for the
 108                  * initrd */
 109                 if (!in_initrd() && startswith(word, "rd."))
 110                         continue;
 111
 112                 if (value) {
 113                         e = startswith(word, key);
 114                         if (!e)
 115                                 continue;
 116
 117                         r = free_and_strdup(&ret, e);
 118                         if (r < 0)
 119                                 return r;
 120
 121                         found = true;
 122                 } else {
 123                         if (streq(word, key))
 124                                 found = true;
 125                 }
 126         }
 127
 128         if (value) {
 129                 *value = ret;
 130                 ret = NULL;
 131         }
 132
 133         return found;
 134
 135 }
 136
 137 #if 0 /// UNNEEDED by elogind
 138 int shall_restore_state(void) {
 139         _cleanup_free_ char *value = NULL;
 140         int r;
 141
 142         r = get_proc_cmdline_key("systemd.restore_state=", &value);
 143         if (r < 0)
 144                 return r;
 145         if (r == 0)
 146                 return true;
 147
 148         return parse_boolean(value);
 149 }
 150
 151 static const char * const rlmap[] = {
 152         "emergency", SPECIAL_EMERGENCY_TARGET,
 153         "-b",        SPECIAL_EMERGENCY_TARGET,
 154         "rescue",    SPECIAL_RESCUE_TARGET,
 155         "single",    SPECIAL_RESCUE_TARGET,
 156         "-s",        SPECIAL_RESCUE_TARGET,
 157         "s",         SPECIAL_RESCUE_TARGET,
 158         "S",         SPECIAL_RESCUE_TARGET,
 159         "1",         SPECIAL_RESCUE_TARGET,
 160         "2",         SPECIAL_MULTI_USER_TARGET,
 161         "3",         SPECIAL_MULTI_USER_TARGET,
 162         "4",         SPECIAL_MULTI_USER_TARGET,
 163         "5",         SPECIAL_GRAPHICAL_TARGET,
 164 };
 165
 166 const char* runlevel_to_target(const char *word) {
 167         size_t i;
 168
 169         if (!word)
 170                 return NULL;
 171
 172         for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
 173                 if (streq(word, rlmap[i]))
 174                         return rlmap[i+1];
 175
 176         return NULL;
 177 }
 178 #endif // 0