X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev_db.c;h=3348c9a02c76d5cf89fa893e367d2837b9a8953c;hp=728d74a0305f9f2a916e53abe0862dbd9f4f5f15;hb=53ba69a0c2c48ad87cc597518f529812c9a6a69e;hpb=2afb8cb37af32495e4f4ff9188e21cbe3a44ce6c diff --git a/udev_db.c b/udev_db.c index 728d74a03..3348c9a02 100644 --- a/udev_db.c +++ b/udev_db.c @@ -31,13 +31,14 @@ #include #include "udev.h" +#include "udev_selinux.h" static size_t devpath_to_db_path(const char *devpath, char *filename, size_t len) { size_t start; - /* add location of db files */ + /* translate to location of db file */ strlcpy(filename, udev_root, len); start = strlcat(filename, "/"DB_DIR"/", len); strlcat(filename, devpath, len); @@ -64,19 +65,69 @@ static int name_index(const char *devpath, const char *name, int add) strlcat(filename, device, sizeof(filename)); if (add) { - dbg("creating: '%s'", filename); + info("creating index: '%s'\n", filename); create_path(filename); fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644); if (fd > 0) close(fd); } else { - dbg("removing: '%s'", filename); + info("removing index: '%s'\n", filename); unlink(filename); delete_path(filename); } return 0; } +int udev_db_get_devices_by_name(const char *name, struct list_head *name_list) +{ + char dirname[PATH_MAX]; + size_t start; + DIR *dir; + int rc = 0; + + strlcpy(dirname, udev_root, sizeof(dirname)); + start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname)); + strlcat(dirname, name, sizeof(dirname)); + path_encode(&dirname[start], sizeof(dirname) - start); + + dir = opendir(dirname); + if (dir == NULL) { + info("no index directory '%s': %s\n", dirname, strerror(errno)); + rc = -1; + goto out; + } + + info("found index directory '%s'\n", dirname); + while (1) { + struct dirent *ent; + char device[PATH_SIZE]; + + ent = readdir(dir); + if (ent == NULL || ent->d_name[0] == '\0') + break; + if (ent->d_name[0] == '.') + continue; + + strlcpy(device, ent->d_name, sizeof(device)); + path_decode(device); + name_list_add(name_list, device, 0); + rc++; + } + closedir(dir); +out: + return rc; +} + +int udev_db_rename(const char *devpath_old, const char *devpath) +{ + char filename[PATH_SIZE]; + char filename_old[PATH_SIZE]; + + devpath_to_db_path(devpath_old, filename_old, sizeof(filename_old)); + devpath_to_db_path(devpath, filename, sizeof(filename)); + return rename(filename_old, filename); +} + int udev_db_add_device(struct udevice *udev) { char filename[PATH_SIZE]; @@ -86,41 +137,46 @@ int udev_db_add_device(struct udevice *udev) devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename)); create_path(filename); - name_index(udev->dev->devpath, udev->name, 1); + unlink(filename); /* - * create only a symlink with the name as the target - * if we don't have any interesting data to remember + * don't waste tmpfs memory pages, if we don't have any data to store + * create fake db-file; store the node-name in a symlink target */ if (list_empty(&udev->symlink_list) && list_empty(&udev->env_list) && !udev->partitions && !udev->ignore_remove) { - dbg("nothing interesting to store, create symlink"); - unlink(filename); - if (symlink(udev->name, filename) != 0) { - err("unable to create db link '%s': %s", filename, strerror(errno)); + int ret; + dbg("nothing interesting to store, create symlink\n"); + selinux_setfscreatecon(filename, NULL, S_IFLNK); + ret = symlink(udev->name, filename); + selinux_resetfscreatecon(); + if (ret != 0) { + err("unable to create db link '%s': %s\n", filename, strerror(errno)); return -1; } } else { - struct name_entry *name_loop; FILE *f; + struct name_entry *name_loop; - unlink(filename); f = fopen(filename, "w"); if (f == NULL) { - err("unable to create db file '%s': %s", filename, strerror(errno)); + err("unable to create db file '%s': %s\n", filename, strerror(errno)); return -1; } - dbg("storing data for device '%s' in '%s'", udev->dev->devpath, filename); + dbg("storing data for device '%s' in '%s'\n", udev->dev->devpath, filename); fprintf(f, "N:%s\n", udev->name); list_for_each_entry(name_loop, &udev->symlink_list, node) { fprintf(f, "S:%s\n", name_loop->name); + /* add symlink-name to index */ name_index(udev->dev->devpath, name_loop->name, 1); } fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt)); - if (udev->link_priority) + if (udev->link_priority != 0) fprintf(f, "L:%u\n", udev->link_priority); - if (udev->partitions) + if (udev->event_timeout >= 0) + fprintf(f, "T:%u\n", udev->event_timeout); + if (udev->partitions != 0) fprintf(f, "A:%u\n", udev->partitions); if (udev->ignore_remove) fprintf(f, "R:%u\n", udev->ignore_remove); @@ -128,6 +184,10 @@ int udev_db_add_device(struct udevice *udev) fprintf(f, "E:%s\n", name_loop->name); fclose(f); } + + /* add name to index */ + name_index(udev->dev->devpath, udev->name, 1); + return 0; } @@ -143,32 +203,32 @@ int udev_db_get_device(struct udevice *udev, const char *devpath) size_t cur; size_t count; - strlcpy(udev->dev->devpath, devpath, sizeof(udev->dev->devpath)); + sysfs_device_set_values(udev->dev, devpath, NULL, NULL); devpath_to_db_path(devpath, filename, sizeof(filename)); if (lstat(filename, &stats) != 0) { - info("no db file to read %s: %s", filename, strerror(errno)); + info("no db file to read %s: %s\n", filename, strerror(errno)); return -1; } if ((stats.st_mode & S_IFMT) == S_IFLNK) { char target[NAME_SIZE]; int target_len; - info("found a symlink as db file"); + info("found a symlink as db file\n"); target_len = readlink(filename, target, sizeof(target)); if (target_len > 0) target[target_len] = '\0'; else { - info("error reading db link %s: %s", filename, strerror(errno)); + info("error reading db link %s: %s\n", filename, strerror(errno)); return -1; } - dbg("db link points to '%s'", target); + dbg("db link points to '%s'\n", target); strlcpy(udev->name, target, sizeof(udev->name)); return 0; } if (file_map(filename, &buf, &bufsize) != 0) { - info("error reading db file %s: %s", filename, strerror(errno)); + info("error reading db file %s: %s\n", filename, strerror(errno)); return -1; } @@ -178,54 +238,35 @@ int udev_db_get_device(struct udevice *udev, const char *devpath) bufline = &buf[cur]; cur += count+1; + if (count > sizeof(line)) + count = sizeof(line); + memcpy(line, &bufline[2], count-2); + line[count-2] = '\0'; + switch(bufline[0]) { case 'N': - if (count > sizeof(udev->name)) - count = sizeof(udev->name); - memcpy(udev->name, &bufline[2], count-2); - udev->name[count-2] = '\0'; + strlcpy(udev->name, line, sizeof(udev->name)); break; case 'M': - if (count > sizeof(line)) - count = sizeof(line); - memcpy(line, &bufline[2], count-2); - line[count-2] = '\0'; sscanf(line, "%u:%u", &maj, &min); udev->devt = makedev(maj, min); break; case 'S': - if (count > sizeof(line)) - count = sizeof(line); - memcpy(line, &bufline[2], count-2); - line[count-2] = '\0'; name_list_add(&udev->symlink_list, line, 0); break; case 'L': - if (count > sizeof(line)) - count = sizeof(line); - memcpy(line, &bufline[2], count-2); - line[count-2] = '\0'; udev->link_priority = atoi(line); break; + case 'T': + udev->event_timeout = atoi(line); + break; case 'A': - if (count > sizeof(line)) - count = sizeof(line); - memcpy(line, &bufline[2], count-2); - line[count-2] = '\0'; udev->partitions = atoi(line); break; case 'R': - if (count > sizeof(line)) - count = sizeof(line); - memcpy(line, &bufline[2], count-2); - line[count-2] = '\0'; udev->ignore_remove = atoi(line); break; case 'E': - if (count > sizeof(line)) - count = sizeof(line); - memcpy(line, &bufline[2], count-2); - line[count-2] = '\0'; name_list_add(&udev->env_list, line, 0); break; } @@ -243,6 +284,9 @@ int udev_db_delete_device(struct udevice *udev) char filename[PATH_SIZE]; struct name_entry *name_loop; + if (udev->test_run) + return 0; + devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename)); unlink(filename); @@ -253,68 +297,6 @@ int udev_db_delete_device(struct udevice *udev) return 0; } -int udev_db_lookup_name(const char *name, char *devpath, size_t len) -{ - char dirname[PATH_MAX]; - size_t start; - DIR *dir; - int found = 0; - - strlcpy(dirname, udev_root, sizeof(dirname)); - start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname)); - strlcat(dirname, name, sizeof(dirname)); - path_encode(&dirname[start], sizeof(dirname) - start); - - dir = opendir(dirname); - if (dir == NULL) { - info("no index directory '%s': %s", dirname, strerror(errno)); - return -1; - } - - info("found index directory '%s'", dirname); - while (!found) { - struct dirent *ent; - char device[PATH_SIZE]; - struct udevice *udev; - - ent = readdir(dir); - if (ent == NULL || ent->d_name[0] == '\0') - break; - if (ent->d_name[0] == '.') - continue; - - strlcpy(device, ent->d_name, sizeof(device)); - path_decode(device); - udev = udev_device_init(); - if (udev == NULL) - break; - if (udev_db_get_device(udev, device) == 0) { - char filename[PATH_SIZE]; - struct stat statbuf; - - info("found db entry '%s'", device); - strlcpy(filename, udev_root, sizeof(filename)); - strlcat(filename, "/", sizeof(filename)); - strlcat(filename, name, sizeof(filename)); - /* make sure device entry matches dev_t */ - if (stat(filename, &statbuf) == 0) { - if (statbuf.st_rdev == udev->devt) { - info("node '%s' matches dev_t", udev->name); - strlcpy(devpath, device, len); - found = 1; - } - } - } - udev_device_cleanup(udev); - } - - closedir(dir); - if (found) - return 0; - else - return -1; -} - int udev_db_get_all_entries(struct list_head *name_list) { char dbpath[PATH_MAX]; @@ -324,7 +306,7 @@ int udev_db_get_all_entries(struct list_head *name_list) strlcat(dbpath, "/"DB_DIR, sizeof(dbpath)); dir = opendir(dbpath); if (dir == NULL) { - info("no udev_db available '%s': %s", dbpath, strerror(errno)); + info("no udev_db available '%s': %s\n", dbpath, strerror(errno)); return -1; } @@ -341,7 +323,7 @@ int udev_db_get_all_entries(struct list_head *name_list) strlcpy(device, ent->d_name, sizeof(device)); path_decode(device); name_list_add(name_list, device, 1); - dbg("added '%s'", device); + dbg("added '%s'\n", device); } closedir(dir);