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kumquat-buildroot/package/busybox/busybox-1.10.1-mdev.patch
Peter Korsgaard 8fdb0e25e6 busybox: 1.10.1 patches
2008-04-29 06:53:55 +00:00

511 lines
13 KiB
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--- busybox-1.10.1/util-linux/mdev.c Sat Apr 19 05:50:39 2008
+++ busybox-1.10.1-mdev/util-linux/mdev.c Sat Apr 26 17:15:54 2008
@@ -12,6 +12,8 @@
#include "libbb.h"
#include "xregex.h"
+#define ENABLE_FEATURE_MDEV_RENAME_REGEXP 1
+
struct globals {
int root_major, root_minor;
};
@@ -21,7 +23,21 @@
#define MAX_SYSFS_DEPTH 3 /* prevent infinite loops in /sys symlinks */
+/* We use additional 64+ bytes in make_device() */
+#define SCRATCH_SIZE 80
+
+static char *next_field(char *s)
+{
+ char *end = skip_non_whitespace(s);
+ s = skip_whitespace(end);
+ *end = '\0';
+ if (*s == '\0')
+ s = NULL;
+ return s;
+}
+
/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
+/* NB: "mdev -s" may call us many times, do not leak memory/fds! */
static void make_device(char *path, int delete)
{
const char *device_name;
@@ -29,7 +45,7 @@
int mode = 0660;
uid_t uid = 0;
gid_t gid = 0;
- char *temp = path + strlen(path);
+ char *dev_maj_min = path + strlen(path);
char *command = NULL;
char *alias = NULL;
@@ -42,156 +58,177 @@
* also depend on path having writeable space after it.
*/
if (!delete) {
- strcat(path, "/dev");
- len = open_read_close(path, temp + 1, 64);
- *temp++ = 0;
+ strcpy(dev_maj_min, "/dev");
+ len = open_read_close(path, dev_maj_min + 1, 64);
+ *dev_maj_min++ = '\0';
if (len < 1) {
- if (ENABLE_FEATURE_MDEV_EXEC)
- /* no "dev" file, so just try to run script */
- *temp = 0;
- else
+ if (!ENABLE_FEATURE_MDEV_EXEC)
return;
+ /* no "dev" file, so just try to run script */
+ *dev_maj_min = '\0';
}
}
/* Determine device name, type, major and minor */
device_name = bb_basename(path);
- type = (path[5] == 'c' ? S_IFCHR : S_IFBLK);
+ /* http://kernel.org/doc/pending/hotplug.txt says that only
+ * "/sys/block/..." is for block devices. "sys/bus" etc is not! */
+ type = (strncmp(&path[5], "block/", 6) == 0 ? S_IFBLK : S_IFCHR);
if (ENABLE_FEATURE_MDEV_CONF) {
FILE *fp;
- char *line, *vline;
+ char *line, *val, *next;
unsigned lineno = 0;
- /* If we have a config file, look up the user settings */
+ /* If we have config file, look up user settings */
fp = fopen_or_warn("/etc/mdev.conf", "r");
if (!fp)
goto end_parse;
- while ((vline = line = xmalloc_getline(fp)) != NULL) {
- int field;
+ while ((line = xmalloc_getline(fp)) != NULL) {
+ regmatch_t off[1+9*ENABLE_FEATURE_MDEV_RENAME_REGEXP];
- /* A pristine copy for command execution. */
- char *orig_line;
- if (ENABLE_FEATURE_MDEV_EXEC)
- orig_line = xstrdup(line);
-
++lineno;
+ trim(line);
+ if (!line[0])
+ goto next_line;
- /* Three fields: regex, uid:gid, mode */
- for (field = 0; field < (3 + ENABLE_FEATURE_MDEV_RENAME + ENABLE_FEATURE_MDEV_EXEC); ++field) {
+ /* Fields: regex uid:gid mode [alias] [cmd] */
- /* Find a non-empty field */
- char *val;
- do {
- val = strtok(vline, " \t");
- vline = NULL;
- } while (val && !*val);
- if (!val) {
- if (field)
- break;
- else
- goto next_line;
- }
+ /* 1st field: regex to match this device */
+ next = next_field(line);
+ {
+ regex_t match;
+ int result;
- if (field == 0) {
+ /* Is this it? */
+ xregcomp(&match, line, REG_EXTENDED);
+ result = regexec(&match, device_name, ARRAY_SIZE(off), off, 0);
+ regfree(&match);
- /* Regex to match this device */
- regex_t match;
- regmatch_t off;
- int result;
+ //bb_error_msg("matches:");
+ //for (int i = 0; i < ARRAY_SIZE(off); i++) {
+ // if (off[i].rm_so < 0) continue;
+ // bb_error_msg("match %d: '%.*s'\n", i,
+ // (int)(off[i].rm_eo - off[i].rm_so),
+ // device_name + off[i].rm_so);
+ //}
- /* Is this it? */
- xregcomp(&match, val, REG_EXTENDED);
- result = regexec(&match, device_name, 1, &off, 0);
- regfree(&match);
+ /* If not this device, skip rest of line */
+ /* (regexec returns whole pattern as "range" 0) */
+ if (result || off[0].rm_so || off[0].rm_eo != strlen(device_name))
+ goto next_line;
+ }
- /* If not this device, skip rest of line */
- if (result || off.rm_so || off.rm_eo != strlen(device_name))
- goto next_line;
+ /* This line matches: stop parsing the file
+ * after parsing the rest of fields */
- } else if (field == 1) {
+ /* 2nd field: uid:gid - device ownership */
+ if (!next) /* field must exist */
+ bb_error_msg_and_die("bad line %u", lineno);
+ val = next;
+ next = next_field(val);
+ {
+ struct passwd *pass;
+ struct group *grp;
+ char *str_uid = val;
+ char *str_gid = strchrnul(val, ':');
- /* uid:gid device ownership */
- struct passwd *pass;
- struct group *grp;
+ if (*str_gid)
+ *str_gid++ = '\0';
+ /* Parse UID */
+ pass = getpwnam(str_uid);
+ if (pass)
+ uid = pass->pw_uid;
+ else
+ uid = strtoul(str_uid, NULL, 10);
+ /* Parse GID */
+ grp = getgrnam(str_gid);
+ if (grp)
+ gid = grp->gr_gid;
+ else
+ gid = strtoul(str_gid, NULL, 10);
+ }
- char *str_uid = val;
- char *str_gid = strchr(val, ':');
- if (str_gid)
- *str_gid = '\0', ++str_gid;
+ /* 3rd field: mode - device permissions */
+ if (!next) /* field must exist */
+ bb_error_msg_and_die("bad line %u", lineno);
+ val = next;
+ next = next_field(val);
+ mode = strtoul(val, NULL, 8);
- /* Parse UID */
- pass = getpwnam(str_uid);
- if (pass)
- uid = pass->pw_uid;
- else
- uid = strtoul(str_uid, NULL, 10);
+ /* 4th field (opt): >alias */
+ if (ENABLE_FEATURE_MDEV_RENAME) {
+ if (!next)
+ break;
+ val = next;
+ next = next_field(val);
+ if (*val == '>') {
+#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
+ /* substitute %1..9 with off[1..9], if any */
+ char *s, *p;
+ unsigned i, n;
- /* parse GID */
- grp = getgrnam(str_gid);
- if (grp)
- gid = grp->gr_gid;
- else
- gid = strtoul(str_gid, NULL, 10);
+ n = 0;
+ s = val;
+ while (*s && *s++ == '%')
+ n++;
- } else if (field == 2) {
-
- /* Mode device permissions */
- mode = strtoul(val, NULL, 8);
-
- } else if (ENABLE_FEATURE_MDEV_RENAME && field == 3) {
-
- if (*val != '>')
- ++field;
- else
- alias = xstrdup(val + 1);
-
+ p = alias = xzalloc(strlen(val) + n * strlen(device_name));
+ s = val + 1;
+ while (*s) {
+ *p = *s;
+ if ('%' == *s) {
+ i = (s[1] - '0');
+ if (i <= 9 && off[i].rm_so >= 0) {
+ n = off[i].rm_eo - off[i].rm_so;
+ strncpy(p, device_name + off[i].rm_so, n);
+ p += n - 1;
+ s++;
+ }
+ }
+ p++;
+ s++;
+ }
+#else
+ alias = xstrdup(val + 1);
+#endif
}
+ }
- if (ENABLE_FEATURE_MDEV_EXEC && field == 3 + ENABLE_FEATURE_MDEV_RENAME) {
+ /* The rest (opt): command to run */
+ if (!next)
+ break;
+ val = next;
+ if (ENABLE_FEATURE_MDEV_EXEC) {
+ const char *s = "@$*";
+ const char *s2 = strchr(s, *val);
- /* Optional command to run */
- const char *s = "@$*";
- const char *s2 = strchr(s, *val);
+ if (!s2)
+ bb_error_msg_and_die("bad line %u", lineno);
- if (!s2) {
- /* Force error */
- field = 1;
- break;
- }
-
- /* Correlate the position in the "@$*" with the delete
- * step so that we get the proper behavior.
- */
- if ((s2 - s + 1) & (1 << delete))
- command = xstrdup(orig_line + (val + 1 - line));
+ /* Correlate the position in the "@$*" with the delete
+ * step so that we get the proper behavior:
+ * @cmd: run on create
+ * $cmd: run on delete
+ * *cmd: run on both
+ */
+ if ((s2 - s + 1) /*1/2/3*/ & /*1/2*/ (1 + delete)) {
+ command = xstrdup(val + 1);
}
}
-
- /* Did everything parse happily? */
- if (field <= 2)
- bb_error_msg_and_die("bad line %u", lineno);
-
+ /* end of field parsing */
+ break; /* we found matching line, stop */
next_line:
free(line);
- if (ENABLE_FEATURE_MDEV_EXEC)
- free(orig_line);
- }
+ } /* end of "while line is read from /etc/mdev.conf" */
- if (ENABLE_FEATURE_CLEAN_UP)
- fclose(fp);
-
- end_parse: /* nothing */ ;
+ free(line); /* in case we used "break" to get here */
+ fclose(fp);
}
+ end_parse:
- if (!delete) {
- if (sscanf(temp, "%d:%d", &major, &minor) != 2) {
- if (ENABLE_FEATURE_MDEV_EXEC)
- goto skip_creation;
- else
- return;
- }
+ if (!delete && sscanf(dev_maj_min, "%u:%u", &major, &minor) == 2) {
if (ENABLE_FEATURE_MDEV_RENAME)
unlink(device_name);
@@ -208,39 +245,44 @@
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
char *dest;
- temp = strrchr(alias, '/');
- if (temp) {
- if (temp[1] != '\0')
- /* given a file name, so rename it */
- *temp = '\0';
+ /* ">bar/": rename to bar/device_name */
+ /* ">bar[/]baz": rename to bar[/]baz */
+ dest = strrchr(alias, '/');
+ if (dest) { /* ">bar/[baz]" ? */
+ *dest = '\0'; /* mkdir bar */
bb_make_directory(alias, 0755, FILEUTILS_RECUR);
- dest = concat_path_file(alias, device_name);
- } else
- dest = alias;
+ *dest = '/';
+ if (dest[1] == '\0') { /* ">bar/" => ">bar/device_name" */
+ dest = alias;
+ alias = concat_path_file(alias, device_name);
+ free(dest);
+ }
+ }
- rename(device_name, dest); // TODO: xrename?
- symlink(dest, device_name);
+ /* recreate device_name as a symlink to moved device node */
+ if (rename(device_name, alias) == 0) {
+ symlink(alias, device_name);
+ }
- if (alias != dest)
- free(alias);
- free(dest);
+ free(alias);
}
}
- skip_creation: /* nothing */ ;
}
+
if (ENABLE_FEATURE_MDEV_EXEC && command) {
- /* setenv will leak memory, so use putenv */
+ /* setenv will leak memory, use putenv/unsetenv/free */
char *s = xasprintf("MDEV=%s", device_name);
putenv(s);
if (system(command) == -1)
- bb_perror_msg_and_die("cannot run %s", command);
+ bb_perror_msg_and_die("can't run '%s'", command);
s[4] = '\0';
unsetenv(s);
free(s);
free(command);
}
+
if (delete)
- remove_file(device_name, FILEUTILS_FORCE);
+ unlink(device_name);
}
/* File callback for /sys/ traversal */
@@ -249,14 +291,15 @@
void *userData,
int depth ATTRIBUTE_UNUSED)
{
- size_t len = strlen(fileName) - 4;
+ size_t len = strlen(fileName) - 4; /* can't underflow */
char *scratch = userData;
- if (strcmp(fileName + len, "/dev"))
+ /* len check is for paranoid reasons */
+ if (strcmp(fileName + len, "/dev") || len >= PATH_MAX)
return FALSE;
strcpy(scratch, fileName);
- scratch[len] = 0;
+ scratch[len] = '\0';
make_device(scratch, 0);
return TRUE;
@@ -287,12 +330,6 @@
int cnt;
int firmware_fd, loading_fd, data_fd;
- /* check for $FIRMWARE from kernel */
- /* XXX: dont bother: open(NULL) works same as open("no-such-file")
- * if (!firmware)
- * return;
- */
-
/* check for /lib/firmware/$FIRMWARE */
xchdir("/lib/firmware");
firmware_fd = xopen(firmware, O_RDONLY);
@@ -304,16 +341,15 @@
xchdir(sysfs_path);
for (cnt = 0; cnt < 30; ++cnt) {
loading_fd = open("loading", O_WRONLY);
- if (loading_fd == -1)
- sleep(1);
- else
- break;
+ if (loading_fd != -1)
+ goto loading;
+ sleep(1);
}
- if (loading_fd == -1)
- goto out;
+ goto out;
+ loading:
/* tell kernel we're loading by `echo 1 > /sys/$DEVPATH/loading` */
- if (write(loading_fd, "1", 1) != 1)
+ if (full_write(loading_fd, "1", 1) != 1)
goto out;
/* load firmware by `cat /lib/firmware/$FIRMWARE > /sys/$DEVPATH/data */
@@ -324,9 +360,9 @@
/* tell kernel result by `echo [0|-1] > /sys/$DEVPATH/loading` */
if (cnt > 0)
- write(loading_fd, "0", 1);
+ full_write(loading_fd, "0", 1);
else
- write(loading_fd, "-1", 2);
+ full_write(loading_fd, "-1", 2);
out:
if (ENABLE_FEATURE_CLEAN_UP) {
@@ -341,16 +377,14 @@
{
char *action;
char *env_path;
- RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
+ RESERVE_CONFIG_BUFFER(temp, PATH_MAX + SCRATCH_SIZE);
xchdir("/dev");
- if (argc == 2 && !strcmp(argv[1],"-s")) {
-
+ if (argc == 2 && !strcmp(argv[1], "-s")) {
/* Scan:
* mdev -s
*/
-
struct stat st;
xstat("/", &st);
@@ -366,26 +400,27 @@
fileAction, dirAction, temp, 0);
} else {
-
/* Hotplug:
* env ACTION=... DEVPATH=... mdev
* ACTION can be "add" or "remove"
* DEVPATH is like "/block/sda" or "/class/input/mice"
*/
-
action = getenv("ACTION");
env_path = getenv("DEVPATH");
if (!action || !env_path)
bb_show_usage();
- sprintf(temp, "/sys%s", env_path);
+ snprintf(temp, PATH_MAX, "/sys%s", env_path);
if (!strcmp(action, "remove"))
make_device(temp, 1);
else if (!strcmp(action, "add")) {
make_device(temp, 0);
- if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE)
- load_firmware(getenv("FIRMWARE"), temp);
+ if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
+ char *fw = getenv("FIRMWARE");
+ if (fw)
+ load_firmware(fw, temp);
+ }
}
}
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