LCOV - code coverage report
Current view: top level - shared - udev-util.c (source / functions) Hit Total Coverage
Test: systemd_full.info Lines: 16 106 15.1 %
Date: 2019-08-23 13:36:53 Functions: 2 8 25.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 18 136 13.2 %

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: LGPL-2.1+ */
       2                 :            : 
       3                 :            : #include <errno.h>
       4                 :            : 
       5                 :            : #include "alloc-util.h"
       6                 :            : #include "device-util.h"
       7                 :            : #include "env-file.h"
       8                 :            : #include "log.h"
       9                 :            : #include "parse-util.h"
      10                 :            : #include "string-table.h"
      11                 :            : #include "string-util.h"
      12                 :            : #include "udev-util.h"
      13                 :            : 
      14                 :            : static const char* const resolve_name_timing_table[_RESOLVE_NAME_TIMING_MAX] = {
      15                 :            :         [RESOLVE_NAME_NEVER] = "never",
      16                 :            :         [RESOLVE_NAME_LATE] = "late",
      17                 :            :         [RESOLVE_NAME_EARLY] = "early",
      18                 :            : };
      19                 :            : 
      20   [ #  #  #  # ]:          0 : DEFINE_STRING_TABLE_LOOKUP(resolve_name_timing, ResolveNameTiming);
      21                 :            : 
      22                 :         32 : int udev_parse_config_full(
      23                 :            :                 unsigned *ret_children_max,
      24                 :            :                 usec_t *ret_exec_delay_usec,
      25                 :            :                 usec_t *ret_event_timeout_usec,
      26                 :            :                 ResolveNameTiming *ret_resolve_name_timing) {
      27                 :            : 
      28                 :         32 :         _cleanup_free_ char *log_val = NULL, *children_max = NULL, *exec_delay = NULL, *event_timeout = NULL, *resolve_names = NULL;
      29                 :            :         int r;
      30                 :            : 
      31                 :         32 :         r = parse_env_file(NULL, "/etc/udev/udev.conf",
      32                 :            :                            "udev_log", &log_val,
      33                 :            :                            "children_max", &children_max,
      34                 :            :                            "exec_delay", &exec_delay,
      35                 :            :                            "event_timeout", &event_timeout,
      36                 :            :                            "resolve_names", &resolve_names);
      37         [ -  + ]:         32 :         if (r == -ENOENT)
      38                 :          0 :                 return 0;
      39         [ -  + ]:         32 :         if (r < 0)
      40                 :          0 :                 return r;
      41                 :            : 
      42         [ -  + ]:         32 :         if (log_val) {
      43                 :            :                 const char *log;
      44                 :            :                 size_t n;
      45                 :            : 
      46                 :            :                 /* unquote */
      47                 :          0 :                 n = strlen(log_val);
      48         [ #  # ]:          0 :                 if (n >= 2 &&
      49   [ #  #  #  # ]:          0 :                     ((log_val[0] == '"' && log_val[n-1] == '"') ||
      50   [ #  #  #  # ]:          0 :                      (log_val[0] == '\'' && log_val[n-1] == '\''))) {
      51                 :          0 :                         log_val[n - 1] = '\0';
      52                 :          0 :                         log = log_val + 1;
      53                 :            :                 } else
      54                 :          0 :                         log = log_val;
      55                 :            : 
      56                 :            :                 /* we set the udev log level here explicitly, this is supposed
      57                 :            :                  * to regulate the code in libudev/ and udev/. */
      58                 :          0 :                 r = log_set_max_level_from_string_realm(LOG_REALM_UDEV, log);
      59         [ #  # ]:          0 :                 if (r < 0)
      60         [ #  # ]:          0 :                         log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
      61                 :            :                                    "failed to set udev log level '%s', ignoring: %m", log);
      62                 :            :         }
      63                 :            : 
      64   [ +  +  -  + ]:         32 :         if (ret_children_max && children_max) {
      65                 :          0 :                 r = safe_atou(children_max, ret_children_max);
      66         [ #  # ]:          0 :                 if (r < 0)
      67         [ #  # ]:          0 :                         log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
      68                 :            :                                    "failed to set parse children_max=%s, ignoring: %m", children_max);
      69                 :            :         }
      70                 :            : 
      71   [ +  +  -  + ]:         32 :         if (ret_exec_delay_usec && exec_delay) {
      72                 :          0 :                 r = parse_sec(exec_delay, ret_exec_delay_usec);
      73         [ #  # ]:          0 :                 if (r < 0)
      74         [ #  # ]:          0 :                         log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
      75                 :            :                                    "failed to set parse exec_delay=%s, ignoring: %m", exec_delay);
      76                 :            :         }
      77                 :            : 
      78   [ +  +  -  + ]:         32 :         if (ret_event_timeout_usec && event_timeout) {
      79                 :          0 :                 r = parse_sec(event_timeout, ret_event_timeout_usec);
      80         [ #  # ]:          0 :                 if (r < 0)
      81         [ #  # ]:          0 :                         log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
      82                 :            :                                    "failed to set parse event_timeout=%s, ignoring: %m", event_timeout);
      83                 :            :         }
      84                 :            : 
      85   [ +  +  -  + ]:         32 :         if (ret_resolve_name_timing && resolve_names) {
      86                 :            :                 ResolveNameTiming t;
      87                 :            : 
      88                 :          0 :                 t = resolve_name_timing_from_string(resolve_names);
      89         [ #  # ]:          0 :                 if (t < 0)
      90         [ #  # ]:          0 :                         log_syntax(NULL, LOG_WARNING, "/etc/udev/udev.conf", 0, r,
      91                 :            :                                    "failed to set parse resolve_names=%s, ignoring.", resolve_names);
      92                 :            :                 else
      93                 :          0 :                         *ret_resolve_name_timing = t;
      94                 :            :         }
      95                 :            : 
      96                 :         32 :         return 0;
      97                 :            : }
      98                 :            : 
      99                 :            : struct DeviceMonitorData {
     100                 :            :         const char *sysname;
     101                 :            :         sd_device *device;
     102                 :            : };
     103                 :            : 
     104                 :          0 : static int device_monitor_handler(sd_device_monitor *monitor, sd_device *device, void *userdata) {
     105                 :          0 :         struct DeviceMonitorData *data = userdata;
     106                 :            :         const char *sysname;
     107                 :            : 
     108         [ #  # ]:          0 :         assert(device);
     109         [ #  # ]:          0 :         assert(data);
     110         [ #  # ]:          0 :         assert(data->sysname);
     111         [ #  # ]:          0 :         assert(!data->device);
     112                 :            : 
     113   [ #  #  #  # ]:          0 :         if (sd_device_get_sysname(device, &sysname) >= 0 && streq(sysname, data->sysname)) {
     114                 :          0 :                 data->device = sd_device_ref(device);
     115                 :          0 :                 return sd_event_exit(sd_device_monitor_get_event(monitor), 0);
     116                 :            :         }
     117                 :            : 
     118                 :          0 :         return 0;
     119                 :            : }
     120                 :            : 
     121                 :          0 : static int device_timeout_handler(sd_event_source *s, uint64_t usec, void *userdata) {
     122                 :          0 :         return sd_event_exit(sd_event_source_get_event(s), -ETIMEDOUT);
     123                 :            : }
     124                 :            : 
     125                 :          0 : int device_wait_for_initialization(sd_device *device, const char *subsystem, usec_t timeout, sd_device **ret) {
     126                 :          0 :         _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor = NULL;
     127                 :          0 :         _cleanup_(sd_event_source_unrefp) sd_event_source *timeout_source = NULL;
     128                 :          0 :         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
     129                 :          0 :         struct DeviceMonitorData data = {};
     130                 :            :         int r;
     131                 :            : 
     132         [ #  # ]:          0 :         assert(device);
     133                 :            : 
     134         [ #  # ]:          0 :         if (sd_device_get_is_initialized(device) > 0) {
     135         [ #  # ]:          0 :                 if (ret)
     136                 :          0 :                         *ret = sd_device_ref(device);
     137                 :          0 :                 return 0;
     138                 :            :         }
     139                 :            : 
     140         [ #  # ]:          0 :         assert_se(sd_device_get_sysname(device, &data.sysname) >= 0);
     141                 :            : 
     142                 :            :         /* Wait until the device is initialized, so that we can get access to the ID_PATH property */
     143                 :            : 
     144                 :          0 :         r = sd_event_new(&event);
     145         [ #  # ]:          0 :         if (r < 0)
     146         [ #  # ]:          0 :                 return log_error_errno(r, "Failed to get default event: %m");
     147                 :            : 
     148                 :          0 :         r = sd_device_monitor_new(&monitor);
     149         [ #  # ]:          0 :         if (r < 0)
     150         [ #  # ]:          0 :                 return log_error_errno(r, "Failed to acquire monitor: %m");
     151                 :            : 
     152         [ #  # ]:          0 :         if (!subsystem) {
     153                 :          0 :                 r = sd_device_get_subsystem(device, &subsystem);
     154   [ #  #  #  # ]:          0 :                 if (r < 0 && r != -ENOENT)
     155   [ #  #  #  #  :          0 :                         return log_device_error_errno(device, r, "Failed to get subsystem: %m");
                   #  # ]
     156                 :            :         }
     157                 :            : 
     158         [ #  # ]:          0 :         if (subsystem) {
     159                 :          0 :                 r = sd_device_monitor_filter_add_match_subsystem_devtype(monitor, subsystem, NULL);
     160         [ #  # ]:          0 :                 if (r < 0)
     161         [ #  # ]:          0 :                         return log_error_errno(r, "Failed to add %s subsystem match to monitor: %m", subsystem);
     162                 :            :         }
     163                 :            : 
     164                 :          0 :         r = sd_device_monitor_attach_event(monitor, event);
     165         [ #  # ]:          0 :         if (r < 0)
     166         [ #  # ]:          0 :                 return log_error_errno(r, "Failed to attach event to device monitor: %m");
     167                 :            : 
     168                 :          0 :         r = sd_device_monitor_start(monitor, device_monitor_handler, &data);
     169         [ #  # ]:          0 :         if (r < 0)
     170         [ #  # ]:          0 :                 return log_error_errno(r, "Failed to start device monitor: %m");
     171                 :            : 
     172         [ #  # ]:          0 :         if (timeout != USEC_INFINITY) {
     173                 :          0 :                 r = sd_event_add_time(event, &timeout_source,
     174                 :          0 :                                       CLOCK_MONOTONIC, now(CLOCK_MONOTONIC) + timeout, 0,
     175                 :            :                                       device_timeout_handler, NULL);
     176         [ #  # ]:          0 :                 if (r < 0)
     177         [ #  # ]:          0 :                         return log_error_errno(r, "Failed to add timeout event source: %m");
     178                 :            :         }
     179                 :            : 
     180                 :            :         /* Check again, maybe things changed. Udev will re-read the db if the device wasn't initialized
     181                 :            :          * yet. */
     182         [ #  # ]:          0 :         if (sd_device_get_is_initialized(device) > 0) {
     183         [ #  # ]:          0 :                 if (ret)
     184                 :          0 :                         *ret = sd_device_ref(device);
     185                 :          0 :                 return 0;
     186                 :            :         }
     187                 :            : 
     188                 :          0 :         r = sd_event_loop(event);
     189         [ #  # ]:          0 :         if (r < 0)
     190         [ #  # ]:          0 :                 return log_error_errno(r, "Failed to wait for device to be initialized: %m");
     191                 :            : 
     192         [ #  # ]:          0 :         if (ret)
     193                 :          0 :                 *ret = TAKE_PTR(data.device);
     194                 :          0 :         return 0;
     195                 :            : }
     196                 :            : 
     197                 :       2492 : int device_is_renaming(sd_device *dev) {
     198                 :            :         int r;
     199                 :            : 
     200         [ -  + ]:       2492 :         assert(dev);
     201                 :            : 
     202                 :       2492 :         r = sd_device_get_property_value(dev, "ID_RENAMING", NULL);
     203   [ +  -  -  + ]:       2492 :         if (r < 0 && r != -ENOENT)
     204                 :          0 :                 return r;
     205                 :            : 
     206                 :       2492 :         return r >= 0;
     207                 :            : }
     208                 :            : 
     209                 :          0 : bool device_for_action(sd_device *dev, DeviceAction action) {
     210                 :            :         DeviceAction a;
     211                 :            : 
     212         [ #  # ]:          0 :         assert(dev);
     213                 :            : 
     214         [ #  # ]:          0 :         if (device_get_action(dev, &a) < 0)
     215                 :          0 :                 return false;
     216                 :            : 
     217                 :          0 :         return a == action;
     218                 :            : }

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