From: Kay Sievers <kay.sievers@suse.de>
Date: Tue, 14 Jun 2005 15:02:55 +0000 (+0200)
Subject: udevinitsend: handle replay messages correctly
X-Git-Tag: 059~13^2~8
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=510de9c9e40c27b1eb224dc49ac439997bfe4db6;p=systemd

udevinitsend: handle replay messages correctly

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
---

diff --git a/udevd.c b/udevd.c
index 6fb0bd94..873b05d9 100644
--- a/udevd.c
+++ b/udevd.c
@@ -542,13 +542,15 @@ static struct uevent_msg *get_udevd_msg(void)
 	}
 
 switch (usend_msg.type) {
-	case UDEVD_UEVENT:
-		dbg("udevd message (UEVENT) received");
+	case UDEVD_UDEVSEND:
+	case UDEVD_INITSEND:
+		dbg("udevd event message received");
 		envbuf_size = size - offsetof(struct udevd_msg, envbuf);
 		dbg("envbuf_size=%i", envbuf_size);
 		msg = get_msg_from_envbuf(usend_msg.envbuf, envbuf_size);
 		if (msg == NULL)
 			return NULL;
+		msg->type = usend_msg.type;
 		return msg;
 	case UDEVD_STOP_EXEC_QUEUE:
 		dbg("udevd message (STOP_EXEC_QUEUE) received");
@@ -566,7 +568,7 @@ switch (usend_msg.type) {
 }
 
 /* receive the kernel user event message and do some sanity checks */
-static struct uevent_msg *get_uevent_msg(void)
+static struct uevent_msg *get_nl_msg(void)
 {
 	struct uevent_msg *msg;
 	int bufpos;
@@ -591,6 +593,7 @@ static struct uevent_msg *get_uevent_msg(void)
 	msg = get_msg_from_envbuf(&buffer[bufpos], size-bufpos);
 	if (msg == NULL)
 		return NULL;
+	msg->type = UDEVD_NL;
 
 	/* validate message */
 	pos = strchr(buffer, '@');
@@ -935,7 +938,7 @@ int main(int argc, char *argv[], char *envp[])
 			msg = get_udevd_msg();
 			if (msg) {
 				/* discard kernel messages if netlink is active */
-				if (uevent_nl_active && msg->seqnum != 0) {
+				if (uevent_nl_active && msg->type == UDEVD_UDEVSEND && msg->seqnum != 0) {
 					dbg("skip uevent_helper message, netlink is active");
 					free(msg);
 					continue;
@@ -945,7 +948,7 @@ int main(int argc, char *argv[], char *envp[])
 		}
 
 		if (FD_ISSET(uevent_nl_sock, &workreadfds)) {
-			msg = get_uevent_msg();
+			msg = get_nl_msg();
 			if (msg) {
 				msg_queue_insert(msg);
 				/* disable kernel uevent_helper with first netlink message */
diff --git a/udevd.h b/udevd.h
index 60732fe0..b8fb6913 100644
--- a/udevd.h
+++ b/udevd.h
@@ -50,7 +50,9 @@
 
 enum udevd_msg_type {
 	UDEVD_UNKNOWN,
-	UDEVD_UEVENT,
+	UDEVD_UDEVSEND,
+	UDEVD_INITSEND,
+	UDEVD_NL,
 	UDEVD_STOP_EXEC_QUEUE,
 	UDEVD_START_EXEC_QUEUE,
 };
@@ -63,6 +65,7 @@ struct udevd_msg {
 };
 
 struct uevent_msg {
+	enum udevd_msg_type type;
 	struct list_head node;
 	pid_t pid;
 	long queue_time;
diff --git a/udevinitsend.c b/udevinitsend.c
index 05c39b99..c7d56fc2 100644
--- a/udevinitsend.c
+++ b/udevinitsend.c
@@ -58,17 +58,18 @@ void log_message (int level, const char *format, ...)
  * Scan a file, write all variables into the msgbuf and
  * fires the message to udevd.
  */
-static int udevsend(char *filename, int sock, int ignore_loops)
+static int udevsend(char *filename, int sock, int disable_loop_detection)
 {
+	static struct udevd_msg usend_msg;
+	int usend_msg_len;
+	int bufpos = 0;
 	struct stat statbuf;
-	int fd, bufpos;
+	int fd;
 	char *fdmap, *ls, *le, *ch;
-	struct udevd_msg usend_msg;
-	int retval = 0;
-	int usend_msg_len;
 	struct sockaddr_un saddr;
 	socklen_t addrlen;
-	
+	int retval = 0;
+
 	if (stat(filename,&statbuf) < 0) {
 		dbg("cannot stat %s: %s\n", filename, strerror(errno));
 		return 1;
@@ -91,24 +92,23 @@ static int udevsend(char *filename, int sock, int ignore_loops)
 	strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH);
 	addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
 
-	memset(usend_msg.envbuf, 0, UEVENT_BUFFER_SIZE+256);
-	bufpos = 0;
 	memset(&usend_msg, 0x00, sizeof(struct udevd_msg));
 	strcpy(usend_msg.magic, UDEV_MAGIC);
+	usend_msg.type = UDEVD_INITSEND;
 
 	ls = fdmap;
 	ch = le = ls;
 	while (*ch && ch < fdmap + statbuf.st_size) {
-		le = strchr(ch,'\n');
+		le = strchr(ch, '\n');
 		if (!le)
 			break;
-		ch = strchr(ch,'=');
+		ch = strchr(ch, '=');
 		if (!ch)
 			break;
 
 		/* prevent loops in the scripts we execute */
 		if (strncmp(ls, "UDEVD_EVENT=", 12) == 0) {
-			if (!ignore_loops) {
+			if (!disable_loop_detection) {
 				dbg("event already handled by udev\n");
 				retval = -1;
 				break;
@@ -161,7 +161,8 @@ int main(int argc, char *argv[], char *envp[])
 	char *event_file = NULL;
 	DIR *dirstream;
 	struct dirent *direntry;
-	int retval = 1, ignore_loops = 0;
+	int retval = 1;
+	int disable_loop_detection = 0;
 	int sock;
 
 	logging_init("udevinitsend");
@@ -186,14 +187,10 @@ int main(int argc, char *argv[], char *envp[])
 			break;
 
 		case 'l':
-			dbg("ignoring loops\n");
-			ignore_loops = 1;
+			dbg("disable loop detection, ignore UDEVD_EVENT\n");
+			disable_loop_detection = 1;
 			break;
 
-		case 'V':
-			printf("udevinitsend, version 0.1\n");
-			return 0;
-
 		case 'h':
 			retval = 0;
 		}
@@ -217,11 +214,11 @@ int main(int argc, char *argv[], char *envp[])
 			if (!strcmp(direntry->d_name,".") ||
 			    !strcmp(direntry->d_name,".."))
 				continue;
-			retval = udevsend(direntry->d_name, sock, ignore_loops);
+			retval = udevsend(direntry->d_name, sock, disable_loop_detection);
 		}
 		closedir(dirstream);
 	} else if (event_file) {
-		retval = udevsend(event_file, sock, ignore_loops);
+		retval = udevsend(event_file, sock, disable_loop_detection);
 	}
 
 	if (sock != -1)
diff --git a/udevsend.c b/udevsend.c
index 888a88da..42ef0271 100644
--- a/udevsend.c
+++ b/udevsend.c
@@ -146,7 +146,7 @@ int main(int argc, char *argv[], char *envp[])
 
 	memset(&usend_msg, 0x00, sizeof(struct udevd_msg));
 	strcpy(usend_msg.magic, UDEV_MAGIC);
-	usend_msg.type = UDEVD_UEVENT;
+	usend_msg.type = UDEVD_UDEVSEND;
 
 	/* copy all keys to send buffer */
 	for (i = 0; envp[i]; i++) {