X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev_rules.c;h=1483f8f4930d50b0d62d2c2a594b1a31f38353c2;hp=03b3f2a1165de1910354677eb9522047b7f49bf6;hb=ac528431dd60c6b7f6b664ba430b937a11a32230;hpb=891205121395acbe84eb6173670ce7934cd9b1c6 diff --git a/udev_rules.c b/udev_rules.c index 03b3f2a11..1483f8f49 100644 --- a/udev_rules.c +++ b/udev_rules.c @@ -1,6 +1,4 @@ /* - * udev_rules.c - * * Copyright (C) 2003 Greg Kroah-Hartman * Copyright (C) 2003-2006 Kay Sievers * @@ -15,7 +13,7 @@ * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., - * 675 Mass Ave, Cambridge, MA 02139, USA. + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * */ @@ -28,6 +26,7 @@ #include #include #include +#include #include #include @@ -246,7 +245,7 @@ static int import_parent_into_env(struct udevice *udev, const char *filter) if (pos) { pos[0] = '\0'; pos++; - if (strcmp_pattern(filter, name) == 0) { + if (fnmatch(filter, name, 0) == 0) { dbg("import key '%s'", name_loop->name); name_list_add(&udev->env_list, name_loop->name, 0); setenv(name, pos, 1); @@ -263,88 +262,6 @@ static int import_parent_into_env(struct udevice *udev, const char *filter) return rc; } -static int match_name_and_get_number(const char *base, const char *devname) -{ - size_t baselen; - char *endptr; - int num; - - baselen = strlen(base); - if (strncmp(base, devname, baselen) != 0) - return -1; - if (devname[baselen] == '\0') - return 0; - if (!isdigit(devname[baselen])) - return -1; - num = strtoul(&devname[baselen], &endptr, 10); - if (endptr[0] != '\0') - return -1; - return num; -} - -/* finds the lowest positive device number such that N isn't present in the udevdb - * if doesn't exist, 0 is returned, N otherwise */ -static int find_free_number(const char *base, const char *devpath) -{ - char db_devpath[PATH_SIZE]; - char filename[PATH_SIZE]; - struct udevice *udev_db; - int num = 0; - static int warn = 1; - - if (warn) { - err("%%e is deprecated, will be removed and is unlikely to work correctly. Don't use it."); - warn = 0; - } - - /* check if the device already owns a matching name */ - udev_db = udev_device_init(); - if (udev_db == NULL) - return -1; - if (udev_db_get_device(udev_db, devpath) == 0) { - struct name_entry *name_loop; - int devnum; - - devnum = match_name_and_get_number(base, udev_db->name); - if (devnum >= 0) { - num = devnum; - dbg("device '%s', already has the node '%s' with num %u, use it", devpath, base, num); - goto out; - } - list_for_each_entry(name_loop, &udev_db->symlink_list, node) { - devnum = match_name_and_get_number(base, name_loop->name); - if (devnum >= 0) { - num = devnum; - dbg("device '%s', already has a symlink '%s' with num %u, use it", devpath, base, num); - goto out; - } - } - } - - /* just search the database again and again until a free name is found */ - strlcpy(filename, base, sizeof(filename)); - while (1) { - dbg("look for existing node '%s'", filename); - if (udev_db_lookup_name(filename, db_devpath, sizeof(db_devpath)) != 0) { - dbg("free num=%d", num); - break; - } - - num++; - if (num > 100000) { - err("find_free_number aborted at num=%d", num); - num = -1; - break; - } - snprintf(filename, sizeof(filename), "%s%d", base, num); - filename[sizeof(filename)-1] = '\0'; - } - -out: - udev_device_cleanup(udev_db); - return num; -} - #define WAIT_LOOP_PER_SECOND 50 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout) { @@ -386,18 +303,16 @@ void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize) int len; int i; int count; - unsigned int next_free_number; enum subst_type { SUBST_UNKNOWN, SUBST_DEVPATH, + SUBST_KERNEL, SUBST_KERNEL_NUMBER, - SUBST_KERNEL_NAME, SUBST_ID, SUBST_MAJOR, SUBST_MINOR, SUBST_RESULT, - SUBST_SYSFS, - SUBST_ENUM, + SUBST_ATTR, SUBST_PARENT, SUBST_TEMP_NODE, SUBST_ROOT, @@ -408,19 +323,19 @@ void udev_rules_apply_format(struct udevice *udev, char *string, size_t maxsize) char fmt; enum subst_type type; } map[] = { - { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH }, - { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER }, - { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL_NAME }, - { .name = "id", .fmt = 'b', .type = SUBST_ID }, - { .name = "major", .fmt = 'M', .type = SUBST_MAJOR }, - { .name = "minor", .fmt = 'm', .type = SUBST_MINOR }, - { .name = "result", .fmt = 'c', .type = SUBST_RESULT }, - { .name = "sysfs", .fmt = 's', .type = SUBST_SYSFS }, - { .name = "enum", .fmt = 'e', .type = SUBST_ENUM }, - { .name = "parent", .fmt = 'P', .type = SUBST_PARENT }, - { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE }, - { .name = "root", .fmt = 'r', .type = SUBST_ROOT }, - { .name = "env", .fmt = 'E', .type = SUBST_ENV }, + { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH }, + { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER }, + { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL }, + { .name = "id", .fmt = 'b', .type = SUBST_ID }, + { .name = "major", .fmt = 'M', .type = SUBST_MAJOR }, + { .name = "minor", .fmt = 'm', .type = SUBST_MINOR }, + { .name = "result", .fmt = 'c', .type = SUBST_RESULT }, + { .name = "attr", .fmt = 's', .type = SUBST_ATTR }, + { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR }, + { .name = "parent", .fmt = 'P', .type = SUBST_PARENT }, + { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE }, + { .name = "root", .fmt = 'r', .type = SUBST_ROOT }, + { .name = "env", .fmt = 'E', .type = SUBST_ENV }, { NULL, '\0', 0 } }; enum subst_type type; @@ -484,9 +399,9 @@ found: strlcat(string, udev->dev->devpath, maxsize); dbg("substitute devpath '%s'", udev->dev->devpath); break; - case SUBST_KERNEL_NAME: - strlcat(string, udev->dev->kernel_name, maxsize); - dbg("substitute kernel name '%s'", udev->dev->kernel_name); + case SUBST_KERNEL: + strlcat(string, udev->dev->kernel, maxsize); + dbg("substitute kernel name '%s'", udev->dev->kernel); break; case SUBST_KERNEL_NUMBER: strlcat(string, udev->dev->kernel_number, maxsize); @@ -494,8 +409,8 @@ found: break; case SUBST_ID: if (udev->dev_parent != NULL) { - strlcat(string, udev->dev_parent->kernel_name, maxsize); - dbg("substitute id '%s'", udev->dev_parent->kernel_name); + strlcat(string, udev->dev_parent->kernel, maxsize); + dbg("substitute id '%s'", udev->dev_parent->kernel); } break; case SUBST_MAJOR: @@ -542,7 +457,7 @@ found: dbg("substitute result string '%s'", udev->program_result); } break; - case SUBST_SYSFS: + case SUBST_ATTR: if (attr == NULL) { dbg("missing attribute"); break; @@ -572,13 +487,6 @@ found: dbg("substitute sysfs value '%s'", temp2); } break; - case SUBST_ENUM: - next_free_number = find_free_number(string, udev->dev->devpath); - if (next_free_number > 0) { - sprintf(temp2, "%d", next_free_number); - strlcat(string, temp2, maxsize); - } - break; case SUBST_PARENT: { struct sysfs_device *dev_parent; @@ -674,7 +582,7 @@ static int match_key(const char *key_name, struct udev_rule *rule, struct key *k pos++; } dbg("match %s '%s' <-> '%s'", key_name, key_value, val); - match = (strcmp_pattern(key_value, val) == 0); + match = (fnmatch(key_value, val, 0) == 0); if (match && (key->operation != KEY_OP_NOMATCH)) { dbg("%s is true (matching value)", key_name); return 0; @@ -697,7 +605,7 @@ static int match_rule(struct udevice *udev, struct udev_rule *rule) if (match_key("ACTION", rule, &rule->action, udev->action)) goto nomatch; - if (match_key("KERNEL", rule, &rule->kernel_name, udev->dev->kernel_name)) + if (match_key("KERNEL", rule, &rule->kernel, udev->dev->kernel)) goto nomatch; if (match_key("SUBSYSTEM", rule, &rule->subsystem, udev->dev->subsystem)) @@ -706,7 +614,10 @@ static int match_rule(struct udevice *udev, struct udev_rule *rule) if (match_key("DEVPATH", rule, &rule->devpath, udev->dev->devpath)) goto nomatch; - /* compare NAME against a previously assigned value */ + if (match_key("DRIVER", rule, &rule->driver, udev->dev->driver)) + goto nomatch; + + /* match NAME against a value assigned by an earlier rule */ if (match_key("NAME", rule, &rule->name, udev->name)) goto nomatch; @@ -732,32 +643,62 @@ static int match_rule(struct udevice *udev, struct udev_rule *rule) int found; found = (wait_for_sysfs(udev, key_val(rule, &rule->wait_for_sysfs), 3) == 0); - if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH)) { - dbg("WAIT_FOR_SYSFS failed"); + if (!found && (rule->wait_for_sysfs.operation != KEY_OP_NOMATCH)) goto nomatch; + } + + /* check for matching sysfs attribute pairs */ + for (i = 0; i < rule->attr.count; i++) { + struct key_pair *pair = &rule->attr.keys[i]; + + if (pair->key.operation == KEY_OP_MATCH || + pair->key.operation == KEY_OP_NOMATCH) { + const char *key_name = key_pair_name(rule, pair); + const char *key_value = key_val(rule, &pair->key); + const char *value; + char val[VALUE_SIZE]; + size_t len; + + value = sysfs_attr_get_value(udev->dev->devpath, key_name); + if (value == NULL) + goto nomatch; + strlcpy(val, value, sizeof(val)); + + /* strip trailing whitespace of value, if not asked to match for it */ + len = strlen(key_value); + if (len > 0 && !isspace(key_value[len-1])) { + len = strlen(val); + while (len > 0 && isspace(val[len-1])) + val[--len] = '\0'; + dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val); + } + + if (match_key("ATTR", rule, &pair->key, val)) + goto nomatch; } } /* walk up the chain of parent devices and find a match */ udev->dev_parent = udev->dev; while (1) { - /* check for matching driver */ - if (match_key("DRIVER", rule, &rule->driver, udev->dev_parent->driver)) + /* check for matching kernel device name */ + if (match_key("KERNELS", rule, &rule->kernels, udev->dev_parent->kernel)) goto try_parent; - /* check for matching subsystem/bus value */ - if (match_key("BUS", rule, &rule->bus, udev->dev_parent->subsystem)) + /* check for matching subsystem value */ + if (match_key("SUBSYSTEMS", rule, &rule->subsystems, udev->dev_parent->subsystem)) goto try_parent; - /* check for matching bus id (device name) */ - if (match_key("ID", rule, &rule->id, udev->dev_parent->kernel_name)) + /* check for matching driver */ + if (match_key("DRIVERS", rule, &rule->drivers, udev->dev_parent->driver)) goto try_parent; - /* check for matching sysfs pairs */ - if (rule->sysfs.count) { - dbg("check %i SYSFS keys", rule->sysfs.count); - for (i = 0; i < rule->sysfs.count; i++) { - struct key_pair *pair = &rule->sysfs.keys[i]; + /* check for matching sysfs attrubute pairs */ + for (i = 0; i < rule->attrs.count; i++) { + struct key_pair *pair = &rule->attrs.keys[i]; + + if (pair->key.operation == KEY_OP_MATCH || + pair->key.operation == KEY_OP_NOMATCH) { const char *key_name = key_pair_name(rule, pair); const char *key_value = key_val(rule, &pair->key); const char *value; @@ -780,10 +721,9 @@ static int match_rule(struct udevice *udev, struct udev_rule *rule) dbg("removed %zi trailing whitespace chars from '%s'", strlen(val)-len, val); } - if (match_key("SYSFS", rule, &pair->key, val)) + if (match_key("ATTRS", rule, &pair->key, val)) goto try_parent; } - dbg("all %i SYSFS keys matched", rule->sysfs.count); } /* found matching device */ @@ -795,7 +735,7 @@ try_parent: if (udev->dev_parent == NULL) goto nomatch; dbg("looking at dev_parent->devpath='%s'", udev->dev_parent->devpath); - dbg("looking at dev_parent->bus_kernel_name='%s'", udev->dev_parent->kernel_name); + dbg("looking at dev_parent->kernel='%s'", udev->dev_parent->kernel); } /* execute external program */ @@ -862,18 +802,48 @@ try_parent: struct key_pair *pair = &rule->env.keys[i]; if (pair->key.operation == KEY_OP_ASSIGN) { + char temp_value[NAME_SIZE]; const char *key_name = key_pair_name(rule, pair); const char *value = key_val(rule, &pair->key); - char *key_value = name_list_key_add(&udev->env_list, key_name, value); + char *key_value; + + /* make sure we don't write to the same string we possibly read from */ + strlcpy(temp_value, value, sizeof(temp_value)); + udev_rules_apply_format(udev, temp_value, NAME_SIZE); + + key_value = name_list_key_add(&udev->env_list, key_name, temp_value); if (key_value == NULL) break; - udev_rules_apply_format(udev, key_value, NAME_SIZE); putenv(key_value); dbg("export ENV '%s'", key_value); } } + /* if we have ATTR assignements write value to sysfs file */ + for (i = 0; i < rule->attr.count; i++) { + struct key_pair *pair = &rule->attr.keys[i]; + + if (pair->key.operation == KEY_OP_ASSIGN) { + const char *key_name = key_pair_name(rule, pair); + const char *key_value = key_val(rule, &pair->key); + char attr[PATH_SIZE]; + FILE *f; + + strlcpy(attr, sysfs_path, sizeof(attr)); + strlcat(attr, udev->dev->devpath, sizeof(attr)); + strlcat(attr, "/", sizeof(attr)); + strlcat(attr, key_name, sizeof(attr)); + dbg("write '%s' to '%s'", key_value, attr); + f = fopen(attr, "w"); + if (f != NULL) { + if (fprintf(f, "%s\n", key_value) <= 0) + err("error writing ATTR{%s}: %s", attr, strerror(errno)); + fclose(f); + } else + err("error opening ATTR{%s} for writing: %s", attr, strerror(errno)); + } + } return 0; nomatch: @@ -886,7 +856,7 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev) int name_set = 0; dbg("udev->dev->devpath='%s'", udev->dev->devpath); - dbg("udev->dev->kernel_name='%s'", udev->dev->kernel_name); + dbg("udev->dev->kernel='%s'", udev->dev->kernel); /* look for a matching rule to apply */ udev_rules_iter_init(rules); @@ -907,7 +877,7 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev) if (match_rule(udev, rule) == 0) { /* apply options */ if (rule->ignore_device) { - info("rule applied, '%s' is ignored", udev->dev->kernel_name); + info("rule applied, '%s' is ignored", udev->dev->kernel); udev->ignore_device = 1; return 0; } @@ -927,21 +897,21 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev) if (rule->mode_operation == KEY_OP_ASSIGN_FINAL) udev->mode_final = 1; udev->mode = rule->mode; - dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel_name); + dbg("applied mode=%#o to '%s'", rule->mode, udev->dev->kernel); } if (!udev->owner_final && rule->owner.operation != KEY_OP_UNSET) { if (rule->owner.operation == KEY_OP_ASSIGN_FINAL) udev->owner_final = 1; strlcpy(udev->owner, key_val(rule, &rule->owner), sizeof(udev->owner)); udev_rules_apply_format(udev, udev->owner, sizeof(udev->owner)); - dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel_name); + dbg("applied owner='%s' to '%s'", udev->owner, udev->dev->kernel); } if (!udev->group_final && rule->group.operation != KEY_OP_UNSET) { if (rule->group.operation == KEY_OP_ASSIGN_FINAL) udev->group_final = 1; strlcpy(udev->group, key_val(rule, &rule->group), sizeof(udev->group)); udev_rules_apply_format(udev, udev->group, sizeof(udev->group)); - dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel_name); + dbg("applied group='%s' to '%s'", udev->group, udev->dev->kernel); } /* collect symlinks */ @@ -996,7 +966,7 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev) if (count) info("%i untrusted character(s) replaced", count); - info("rule applied, '%s' becomes '%s'", udev->dev->kernel_name, udev->name); + info("rule applied, '%s' becomes '%s'", udev->dev->kernel, udev->name); if (strcmp(udev->dev->subsystem, "net") != 0) dbg("name, '%s' is going to have owner='%s', group='%s', mode=%#o partitions=%i", udev->name, udev->owner, udev->group, udev->mode, udev->partitions); @@ -1026,7 +996,7 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev) } if (!name_set) { - strlcpy(udev->name, udev->dev->kernel_name, sizeof(udev->name)); + strlcpy(udev->name, udev->dev->kernel, sizeof(udev->name)); info("no node name set, will use kernel name '%s'", udev->name); } @@ -1043,7 +1013,7 @@ int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev) { struct udev_rule *rule; - dbg("udev->kernel_name='%s'", udev->dev->kernel_name); + dbg("udev->kernel='%s'", udev->dev->kernel); /* look for a matching rule to apply */ udev_rules_iter_init(rules); @@ -1061,7 +1031,7 @@ int udev_rules_get_run(struct udev_rules *rules, struct udevice *udev) if (match_rule(udev, rule) == 0) { if (rule->ignore_device) { - info("rule applied, '%s' is ignored", udev->dev->kernel_name); + info("rule applied, '%s' is ignored", udev->dev->kernel); udev->ignore_device = 1; return 0; }