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Diffstat (limited to 'meta/recipes-devtools/makedevs/makedevs/makedevs.c')
-rw-r--r--meta/recipes-devtools/makedevs/makedevs/makedevs.c589
1 files changed, 589 insertions, 0 deletions
diff --git a/meta/recipes-devtools/makedevs/makedevs/makedevs.c b/meta/recipes-devtools/makedevs/makedevs/makedevs.c
new file mode 100644
index 0000000000..771f33ef5a
--- /dev/null
+++ b/meta/recipes-devtools/makedevs/makedevs/makedevs.c
@@ -0,0 +1,589 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <time.h>
+#include <getopt.h>
+#include <libgen.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#define MINORBITS 8
+#define MKDEV(ma,mi) (((ma) << MINORBITS) | (mi))
+#define MAX_ID_LEN 40
+#define MAX_NAME_LEN 40
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+#define VERSION "1.0.1"
+
+/* These are all stolen from busybox's libbb to make
+ * error handling simpler (and since I maintain busybox,
+ * I'm rather partial to these for error handling).
+ * -Erik
+ */
+static const char *const app_name = "makedevs";
+static const char *const memory_exhausted = "memory exhausted";
+static char default_rootdir[]=".";
+static char *rootdir = default_rootdir;
+static int trace = 0;
+
+struct name_id {
+ char name[MAX_NAME_LEN+1];
+ unsigned long id;
+ struct name_id *next;
+};
+
+static struct name_id *usr_list = NULL;
+static struct name_id *grp_list = NULL;
+
+static void verror_msg(const char *s, va_list p)
+{
+ fflush(stdout);
+ fprintf(stderr, "%s: ", app_name);
+ vfprintf(stderr, s, p);
+}
+
+static void error_msg_and_die(const char *s, ...)
+{
+ va_list p;
+
+ va_start(p, s);
+ verror_msg(s, p);
+ va_end(p);
+ putc('\n', stderr);
+ exit(EXIT_FAILURE);
+}
+
+static void vperror_msg(const char *s, va_list p)
+{
+ int err = errno;
+
+ if (s == 0)
+ s = "";
+ verror_msg(s, p);
+ if (*s)
+ s = ": ";
+ fprintf(stderr, "%s%s\n", s, strerror(err));
+}
+
+static void perror_msg_and_die(const char *s, ...)
+{
+ va_list p;
+
+ va_start(p, s);
+ vperror_msg(s, p);
+ va_end(p);
+ exit(EXIT_FAILURE);
+}
+
+static FILE *xfopen(const char *path, const char *mode)
+{
+ FILE *fp;
+
+ if ((fp = fopen(path, mode)) == NULL)
+ perror_msg_and_die("%s", path);
+ return fp;
+}
+
+static char *xstrdup(const char *s)
+{
+ char *t;
+
+ if (s == NULL)
+ return NULL;
+
+ t = strdup(s);
+
+ if (t == NULL)
+ error_msg_and_die(memory_exhausted);
+
+ return t;
+}
+
+static struct name_id* alloc_node(void)
+{
+ struct name_id *node;
+ node = (struct name_id*)malloc(sizeof(struct name_id));
+ if (node == NULL) {
+ error_msg_and_die(memory_exhausted);
+ }
+ memset((void *)node->name, 0, MAX_NAME_LEN+1);
+ node->id = 0xffffffff;
+ node->next = NULL;
+ return node;
+}
+
+static struct name_id* parse_line(char *line)
+{
+ char *p;
+ int i;
+ char id_buf[MAX_ID_LEN+1];
+ struct name_id *node;
+ node = alloc_node();
+ p = line;
+ i = 0;
+ // Get name field
+ while (*p != ':') {
+ if (i > MAX_NAME_LEN)
+ error_msg_and_die("Name field too long");
+ node->name[i++] = *p++;
+ }
+ node->name[i] = '\0';
+ p++;
+ // Skip the second field
+ while (*p != ':')
+ p++;
+ p++;
+ // Get id field
+ i = 0;
+ while (*p != ':') {
+ if (i > MAX_ID_LEN)
+ error_msg_and_die("ID filed too long");
+ id_buf[i++] = *p++;
+ }
+ id_buf[i] = '\0';
+ node->id = atol(id_buf);
+ return node;
+}
+
+static void get_list_from_file(FILE *file, struct name_id **plist)
+{
+ char *line;
+ int len = 0;
+ size_t length = 256;
+ struct name_id *node, *cur;
+
+ if((line = (char *)malloc(length)) == NULL) {
+ error_msg_and_die(memory_exhausted);
+ }
+
+ while ((len = getline(&line, &length, file)) != -1) {
+ node = parse_line(line);
+ if (*plist == NULL) {
+ *plist = node;
+ cur = *plist;
+ } else {
+ cur->next = node;
+ cur = cur->next;
+ }
+ }
+
+ if (line)
+ free(line);
+}
+
+static unsigned long convert2guid(char *id_buf, struct name_id *search_list)
+{
+ char *p;
+ int isnum;
+ struct name_id *node;
+ p = id_buf;
+ isnum = 1;
+ while (*p != '\0') {
+ if (!isdigit(*p)) {
+ isnum = 0;
+ break;
+ }
+ p++;
+ }
+ if (isnum) {
+ // Check for bad user/group name
+ node = search_list;
+ while (node != NULL) {
+ if (!strncmp(node->name, id_buf, strlen(id_buf))) {
+ fprintf(stderr, "WARNING: Bad user/group name %s detected\n", id_buf);
+ break;
+ }
+ node = node->next;
+ }
+ return (unsigned long)atol(id_buf);
+ } else {
+ node = search_list;
+ while (node != NULL) {
+ if (!strncmp(node->name, id_buf, strlen(id_buf)))
+ return node->id;
+ node = node->next;
+ }
+ error_msg_and_die("No entry for %s in search list", id_buf);
+ }
+}
+
+static void free_list(struct name_id *list)
+{
+ struct name_id *cur;
+ cur = list;
+ while (cur != NULL) {
+ list = cur;
+ cur = cur->next;
+ free(list);
+ }
+}
+
+static void add_new_directory(char *name, char *path,
+ unsigned long uid, unsigned long gid, unsigned long mode)
+{
+ if (trace)
+ fprintf(stderr, "Directory: %s %s UID: %ld GID %ld MODE: %04lo", path, name, uid, gid, mode);
+
+ if (mkdir(path, mode) < 0) {
+ if (EEXIST == errno) {
+ /* Unconditionally apply the mode setting to the existing directory.
+ * XXX should output something when trace */
+ chmod(path, mode & ~S_IFMT);
+ }
+ }
+ if (trace)
+ putc('\n', stderr);
+ chown(path, uid, gid);
+}
+
+static void add_new_device(char *name, char *path, unsigned long uid,
+ unsigned long gid, unsigned long mode, dev_t rdev)
+{
+ int status;
+ struct stat sb;
+
+ if (trace) {
+ fprintf(stderr, "Device: %s %s UID: %ld GID: %ld MODE: %04lo MAJOR: %d MINOR: %d",
+ path, name, uid, gid, mode, (short)(rdev >> 8), (short)(rdev & 0xff));
+ }
+
+ memset(&sb, 0, sizeof(struct stat));
+ status = lstat(path, &sb);
+ if (status >= 0) {
+ /* It is ok for some types of files to not exit on disk (such as
+ * device nodes), but if they _do_ exist, the file type bits had
+ * better match those of the actual file or strange things will happen... */
+ if ((mode & S_IFMT) != (sb.st_mode & S_IFMT)) {
+ if (trace)
+ putc('\n', stderr);
+ error_msg_and_die("%s: existing file (04%o) type does not match specified file type (04%lo)!",
+ path, (sb.st_mode & S_IFMT), (mode & S_IFMT));
+ }
+ if (mode != sb.st_mode) {
+ if (trace)
+ fprintf(stderr, " -- applying new mode 04%lo (old was 04%o)\n", mode & ~S_IFMT, sb.st_mode & ~S_IFMT);
+ /* Apply the mode setting to the existing device node */
+ chmod(path, mode & ~S_IFMT);
+ }
+ else {
+ if (trace)
+ fprintf(stderr, " -- extraneous entry in table\n", path);
+ }
+ }
+ else {
+ mknod(path, mode, rdev);
+ if (trace)
+ putc('\n', stderr);
+
+ }
+
+ chown(path, uid, gid);
+}
+
+static void add_new_file(char *name, char *path, unsigned long uid,
+ unsigned long gid, unsigned long mode)
+{
+ if (trace) {
+ fprintf(stderr, "File: %s %s UID: %ld GID: %ld MODE: %04lo\n",
+ path, name, gid, uid, mode);
+ }
+
+ int fd = open(path,O_CREAT | O_WRONLY, mode);
+ if (fd < 0) {
+ error_msg_and_die("%s: file can not be created!", path);
+ } else {
+ close(fd);
+ }
+ chmod(path, mode);
+ chown(path, uid, gid);
+}
+
+
+static void add_new_fifo(char *name, char *path, unsigned long uid,
+ unsigned long gid, unsigned long mode)
+{
+ if (trace) {
+ printf("Fifo: %s %s UID: %ld GID: %ld MODE: %04lo\n",
+ path, name, gid, uid, mode);
+ }
+
+ int status;
+ struct stat sb;
+
+ memset(&sb, 0, sizeof(struct stat));
+ status = stat(path, &sb);
+
+
+ /* Update the mode if we exist and are a fifo already */
+ if (status >= 0 && S_ISFIFO(sb.st_mode)) {
+ chmod(path, mode);
+ } else {
+ if (mknod(path, mode, 0))
+ error_msg_and_die("%s: file can not be created with mknod!", path);
+ }
+ chown(path, uid, gid);
+}
+
+
+/* device table entries take the form of:
+ <path> <type> <mode> <usr> <grp> <major> <minor> <start> <inc> <count>
+ /dev/mem c 640 0 0 1 1 0 0 -
+ /dev/zero c 644 root root 1 5 - - -
+
+ type can be one of:
+ f A regular file
+ d Directory
+ c Character special device file
+ b Block special device file
+ p Fifo (named pipe)
+
+ I don't bother with symlinks (permissions are irrelevant), hard
+ links (special cases of regular files), or sockets (why bother).
+
+ Regular files must exist in the target root directory. If a char,
+ block, fifo, or directory does not exist, it will be created.
+*/
+static int interpret_table_entry(char *line)
+{
+ char *name;
+ char usr_buf[MAX_ID_LEN];
+ char grp_buf[MAX_ID_LEN];
+ char path[4096], type;
+ unsigned long mode = 0755, uid = 0, gid = 0, major = 0, minor = 0;
+ unsigned long start = 0, increment = 1, count = 0;
+
+ if (0 > sscanf(line, "%40s %c %lo %40s %40s %lu %lu %lu %lu %lu", path,
+ &type, &mode, usr_buf, grp_buf, &major, &minor, &start,
+ &increment, &count))
+ {
+ fprintf(stderr, "%s: sscanf returned < 0 for line '%s'\n", app_name, line);
+ return 1;
+ }
+
+ uid = convert2guid(usr_buf, usr_list);
+ gid = convert2guid(grp_buf, grp_list);
+
+ if (strncmp(path, "/", 1)) {
+ error_msg_and_die("Device table entries require absolute paths");
+ }
+ name = xstrdup(path + 1);
+ /* prefix path with rootdir */
+ sprintf(path, "%s/%s", rootdir, name);
+
+ /* XXX Why is name passed into all of the add_new_*() routines? */
+ switch (type) {
+ case 'd':
+ mode |= S_IFDIR;
+ add_new_directory(name, path, uid, gid, mode);
+ break;
+ case 'f':
+ mode |= S_IFREG;
+ add_new_file(name, path, uid, gid, mode);
+ break;
+ case 'p':
+ mode |= S_IFIFO;
+ add_new_fifo(name, path, uid, gid, mode);
+ break;
+ case 'c':
+ case 'b':
+ mode |= (type == 'c') ? S_IFCHR : S_IFBLK;
+ if (count > 0) {
+ int i;
+ dev_t rdev;
+ char buf[80];
+
+ for (i = start; i < start + count; i++) {
+ sprintf(buf, "%s%d", name, i);
+ sprintf(path, "%s/%s%d", rootdir, name, i);
+ /* FIXME: MKDEV uses illicit insider knowledge of kernel
+ * major/minor representation... */
+ rdev = MKDEV(major, minor + (i - start) * increment);
+ sprintf(path, "%s/%s\0", rootdir, buf);
+ add_new_device(buf, path, uid, gid, mode, rdev);
+ }
+ } else {
+ /* FIXME: MKDEV uses illicit insider knowledge of kernel
+ * major/minor representation... */
+ dev_t rdev = MKDEV(major, minor);
+ add_new_device(name, path, uid, gid, mode, rdev);
+ }
+ break;
+ default:
+ error_msg_and_die("Unsupported file type");
+ }
+ if (name) free(name);
+ return 0;
+}
+
+
+static void parse_device_table(FILE * file)
+{
+ char *line;
+ size_t length = 256;
+ int len = 0;
+
+ if((line = (char *)malloc(length)) == NULL) {
+ error_msg_and_die(memory_exhausted);
+ }
+ /* Looks ok so far. The general plan now is to read in one
+ * line at a time, trim off leading and trailing whitespace,
+ * check for leading comment delimiters ('#') or a blank line,
+ * then try and parse the line as a device table entry. If we fail
+ * to parse things, try and help the poor fool to fix their
+ * device table with a useful error msg... */
+
+ while ((len = getline(&line, &length, file)) != -1) {
+ /* First trim off any whitespace */
+
+ /* trim trailing whitespace */
+ while (len > 0 && isspace(line[len - 1]))
+ line[--len] = '\0';
+
+ /* trim leading whitespace */
+ memmove(line, &line[strspn(line, " \n\r\t\v")], len + 1);
+
+ /* If this is NOT a comment or an empty line, try to interpret it */
+ if (*line != '#' && *line != '\0') interpret_table_entry(line);
+ }
+
+ if (line)
+ free(line);
+}
+
+static int parse_devtable(FILE * devtable)
+{
+ struct stat sb;
+
+ if (lstat(rootdir, &sb)) {
+ perror_msg_and_die("%s", rootdir);
+ }
+ if (chdir(rootdir))
+ perror_msg_and_die("%s", rootdir);
+
+ if (devtable)
+ parse_device_table(devtable);
+
+ return 0;
+}
+
+
+static struct option long_options[] = {
+ {"root", 1, NULL, 'r'},
+ {"help", 0, NULL, 'h'},
+ {"trace", 0, NULL, 't'},
+ {"version", 0, NULL, 'v'},
+ {"devtable", 1, NULL, 'D'},
+ {NULL, 0, NULL, 0}
+};
+
+static char *helptext =
+ "Usage: makedevs [OPTIONS]\n"
+ "Build entries based upon device_table.txt\n\n"
+ "Options:\n"
+ " -r, -d, --root=DIR Build filesystem from directory DIR (default: cwd)\n"
+ " -D, --devtable=FILE Use the named FILE as a device table file\n"
+ " -h, --help Display this help text\n"
+ " -t, --trace Be verbose\n"
+ " -v, --version Display version information\n\n";
+
+
+int main(int argc, char **argv)
+{
+ int c, opt;
+ extern char *optarg;
+ struct stat statbuf;
+ char passwd_path[PATH_MAX];
+ char group_path[PATH_MAX];
+ FILE *passwd_file = NULL;
+ FILE *group_file = NULL;
+ FILE *devtable = NULL;
+ DIR *dir = NULL;
+
+ umask (0);
+
+ if (argc==1) {
+ fprintf(stderr, helptext);
+ exit(1);
+ }
+
+ while ((opt = getopt_long(argc, argv, "D:d:r:htv",
+ long_options, &c)) >= 0) {
+ switch (opt) {
+ case 'D':
+ devtable = xfopen(optarg, "r");
+ if (fstat(fileno(devtable), &statbuf) < 0)
+ perror_msg_and_die(optarg);
+ if (statbuf.st_size < 10)
+ error_msg_and_die("%s: not a proper device table file", optarg);
+ break;
+ case 'h':
+ printf(helptext);
+ exit(0);
+ case 'r':
+ case 'd': /* for compatibility with mkfs.jffs, genext2fs, etc... */
+ if (rootdir != default_rootdir) {
+ error_msg_and_die("root directory specified more than once");
+ }
+ if ((dir = opendir(optarg)) == NULL) {
+ perror_msg_and_die(optarg);
+ } else {
+ closedir(dir);
+ }
+ /* If "/" is specified, use "" because rootdir is always prepended to a
+ * string that starts with "/" */
+ if (0 == strcmp(optarg, "/"))
+ rootdir = xstrdup("");
+ else
+ rootdir = xstrdup(optarg);
+ break;
+
+ case 't':
+ trace = 1;
+ break;
+
+ case 'v':
+ printf("%s: %s\n", app_name, VERSION);
+ exit(0);
+ default:
+ fprintf(stderr, helptext);
+ exit(1);
+ }
+ }
+
+ if (argv[optind] != NULL) {
+ fprintf(stderr, helptext);
+ exit(1);
+ }
+
+ // Get name-id mapping
+ sprintf(passwd_path, "%s/etc/passwd", rootdir);
+ sprintf(group_path, "%s/etc/group", rootdir);
+ if ((passwd_file = fopen(passwd_path, "r")) != NULL) {
+ get_list_from_file(passwd_file, &usr_list);
+ fclose(passwd_file);
+ }
+ if ((group_file = fopen(group_path, "r")) != NULL) {
+ get_list_from_file(group_file, &grp_list);
+ fclose(group_file);
+ }
+
+ // Parse devtable
+ if(devtable) {
+ parse_devtable(devtable);
+ fclose(devtable);
+ }
+
+ // Free list
+ free_list(usr_list);
+ free_list(grp_list);
+
+ return 0;
+}
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-11 20:24:27 +0000