X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=extras%2Fvolume_id%2Fvol_id.c;h=dcf56d87e9fb4562c1fe3f54de8075232637795c;hp=3048fd8062c1c43fa4129bac65f8fe1198d66f87;hb=674e00f67c5dc4bd6e7c5aff21c11b36eb81cd75;hpb=208f6aba21199ff4f93002eeb948d564f76843e6;ds=sidebyside

diff --git a/extras/volume_id/vol_id.c b/extras/volume_id/vol_id.c
index 3048fd806..dcf56d87e 100644
--- a/extras/volume_id/vol_id.c
+++ b/extras/volume_id/vol_id.c
@@ -1,10 +1,7 @@
 /*
- * udev_volume_id - udev callout to read filesystem label and uuid
+ * vol_id - read filesystem label and uuid
  *
- * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
- *
- *	sample udev rule for creation of a symlink with the filsystem uuid:
- *	KERNEL="sd*", PROGRAM="/sbin/udev_volume_id -u %N", SYMLINK="%c"
+ * Copyright (C) 2005-2006 Kay Sievers <kay.sievers@vrfy.org>
  *
  *	This program is free software; you can redistribute it and/or modify it
  *	under the terms of the GNU General Public License as published by the
@@ -30,12 +27,11 @@
 #include <unistd.h>
 #include <string.h>
 #include <ctype.h>
+#include <grp.h>
 #include <sys/ioctl.h>
 
-#include "../../udev_utils.h"
-#include "../../logging.h"
-#include "volume_id/volume_id.h"
-#include "volume_id/dasd.h"
+#include "../../udev.h"
+#include "lib/libvolume_id.h"
 
 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
 
@@ -64,38 +60,56 @@ void log_message(int priority, const char *format, ...)
 }
 #endif
 
-static void set_str(char *to, const unsigned char *from, int count)
+static void vid_log(int priority, const char *file, int line, const char *format, ...)
+{
+#ifdef USE_LOG
+	char log_str[1024];
+	va_list args;
+
+	va_start(args, format);
+	vsnprintf(log_str, sizeof(log_str), format, args);
+	log_str[sizeof(log_str)-1] = '\0';
+	log_message(priority, "%s:%i %s", file, line, log_str);
+	va_end(args);
+#endif
+	return;
+}
+
+static void set_str(char *to, const char *from, size_t count)
 {
-	int i, j;
-	int len;
+	size_t i, j, len;
 
+	/* strip trailing whitespace */
 	len = strnlen(from, count);
-	while (isspace(from[len-1]))
+	while (len && isspace(from[len-1]))
 		len--;
 
+	/* strip leading whitespace */
 	i = 0;
 	while (isspace(from[i]) && (i < len))
 		i++;
 
 	j = 0;
 	while (i < len) {
-		switch(from[i]) {
-		case '/':
-			break;
-		case ' ':
+		/* substitute multiple whitespace */
+		if (isspace(from[i])) {
+			while (isspace(from[i]))
+				i++;
 			to[j++] = '_';
-			break;
-		default:
-			to[j++] = from[i];
 		}
-		i++;
+		/* skip chars */
+		if (from[i] == '/') {
+			i++;
+			continue;
+		}
+		to[j++] = from[i++];
 	}
 	to[j] = '\0';
 }
 
 int main(int argc, char *argv[])
 {
-	const char help[] = "usage: udev_volume_id [--export|-t|-l|-u] <device>\n"
+	const char help[] = "usage: vol_id [--export|-t|-l|-u] <device>\n"
 			    "       --export\n"
 			    "       -t filesystem type\n"
 			    "       -l filesystem label\n"
@@ -110,11 +124,16 @@ int main(int argc, char *argv[])
 	struct volume_id *vid = NULL;
 	static char name[VOLUME_ID_LABEL_SIZE];
 	int i;
-	unsigned long long size;
+	uint64_t size;
 	const char *node = NULL;
+	uid_t nobody_uid;
+	gid_t nobody_gid;
 	int rc = 0;
 
-	logging_init("udev_volume_id");
+	logging_init("vol_id");
+
+	/* hook in our debug into libvolume_id */
+	volume_id_log_fn = vid_log;
 
 	for (i = 1 ; i < argc; i++) {
 		char *arg = argv[i];
@@ -139,26 +158,38 @@ int main(int argc, char *argv[])
 
 	vid = volume_id_open_node(node);
 	if (vid == NULL) {
-		fprintf(stderr, "error open volume\n");
+		fprintf(stderr, "%s: error open volume\n", node);
 		rc = 2;
 		goto exit;
 	}
 
 	if (ioctl(vid->fd, BLKGETSIZE64, &size) != 0)
 		size = 0;
+	dbg("BLKGETSIZE64=%llu", size);
+
+	/* drop all privileges */
+	nobody_uid = lookup_user("nobody");
+	nobody_gid = lookup_group("nogroup");
+	if (nobody_uid > 0 && nobody_gid > 0) {
+		if (setgroups(0, NULL) != 0 ||
+		    setgid(nobody_gid) != 0 ||
+		    setuid(nobody_uid) != 0) {
+			rc = 3;
+			goto exit;
+		}
+	}
 
 	if (volume_id_probe_all(vid, 0, size) == 0)
 		goto print;
 
-	if (volume_id_probe_dasd(vid) == 0)
-		goto print;
-
-	fprintf(stderr, "unknown volume type\n");
-	rc = 3;
+	if (print != PRINT_EXPORT)
+		fprintf(stderr, "%s: unknown volume type\n", node);
+	rc = 4;
 	goto exit;
 
 print:
 	set_str(name, vid->label, sizeof(vid->label));
+	replace_untrusted_chars(name);
 
 	switch (print) {
 	case PRINT_EXPORT: