Make mksock() more generic, move to util library

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>

initd/Makemodule.am

@@ -1,5 +1,5 @@
 init_SOURCES = initd/main.c initd/init.h initd/signal_linux.c initd/runsvc.c
-init_SOURCES += initd/status.c initd/mksock.c initd/svclist.c
+init_SOURCES += initd/status.c initd/svclist.c
 init_CPPFLAGS = $(AM_CPPFLAGS)
 init_CFLAGS = $(AM_CFLAGS)
 init_LDFLAGS = $(AM_LDFLAGS)

initd/init.h

@@ -64,18 +64,6 @@ int runsvc_wait(service_t *svc);
 */
 void print_status(const char *msg, int type, bool update);
 
-/********** mksock.c **********/
-
-/*
-	Create a UNIX socket that programs can use to pass messages to init.
-
-	Returns the socked fd or -1 on failure. The function takes care of
-	printing error messages on failure.
-
-	The socket has the CLOEXEC flag set.
-*/
-int mksock(void);
-
 /********** svclist.c **********/
 
 /*

initd/main.c

@@ -207,7 +207,7 @@ int main(void)
 			runlevel = target;
 
 			if (target == TGT_BOOT && ti_sock == -1) {
-				ti_sock = mksock();
+				ti_sock = mksock(INITSOCK, SOCK_FLAG_ROOT_ONLY);
 				if (ti_sock != -1) {
 					pfd[1].fd = ti_sock;
 					pfd[1].events = POLLIN;

lib/Makemodule.am

@@ -1,7 +1,7 @@
 HEADRS = lib/include/util.h lib/include/service.h lib/include/telinit.h
 
 libinit_a_SOURCES = lib/util/delsvc.c lib/util/svcmap.c lib/util/enum_by_name.c
-libinit_a_SOURCES += lib/util/rdsvc.c lib/util/svcscan.c
+libinit_a_SOURCES += lib/util/rdsvc.c lib/util/svcscan.c lib/util/mksock.c
 libinit_a_SOURCES += lib/util/del_svc_list.c lib/util/svc_tsort.c
 libinit_a_SOURCES += lib/util/opensock.c lib/util/enum_to_name.c $(HEADRS)
 libinit_a_CPPFLAGS = $(AM_CPPFLAGS)

lib/include/util.h

@@ -35,6 +35,17 @@ typedef struct {
 	int value;
 } enum_map_t;
 
+enum {
+	/* only allow root to connect */
+	SOCK_FLAG_ROOT_ONLY = 0x01,
+
+	/* allow everyone to connect */
+	SOCK_FLAG_EVERYONE = 0x02,
+
+	/* create a datagram socket, otherwise use a stream socket */
+	SOCK_FLAG_DGRAM = 0x04,
+};
+
 /*
 	Search through an array of enum_map_t entries to resolve a string to
 	a numeric value. The end of the map is indicated by a sentinel entry
@@ -49,5 +60,15 @@ const enum_map_t *enum_by_name(const enum_map_t *map, const char *name);
 */
 const char *enum_to_name(const enum_map_t *map, int value);
 
+/*
+	Create a UNIX stream socket at the given path.
+
+	Returns the socket fd, -1 on failure. The function takes care of
+	printing error messages on failure.
+
+	The socket has the CLOEXEC flag set.
+*/
+int mksock(const char *path, int flags);
+
 #endif /* UTIL_H */
 

lib/util/mksock.c

@@ -23,16 +23,19 @@
 #include <string.h>
 #include <fcntl.h>
 #include <stdio.h>
+#include <errno.h>
 
-#include "telinit.h"
-#include "init.h"
+#include "util.h"
 
-int mksock(void)
+int mksock(const char *path, int flags)
 {
 	struct sockaddr_un un;
-	int fd;
+	const char *errmsg;
+	int fd, type;
 
-	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
+	type = (flags & SOCK_FLAG_DGRAM) ? SOCK_DGRAM : SOCK_STREAM;
+
+	fd = socket(AF_UNIX, type | SOCK_CLOEXEC, 0);
 	if (fd < 0) {
 		perror("socket");
 		return -1;
@@ -41,31 +44,41 @@ int mksock(void)
 	memset(&un, 0, sizeof(un));
 	un.sun_family = AF_UNIX;
 
-	strcpy(un.sun_path, INITSOCK);
+	strcpy(un.sun_path, path);
 
 	if (bind(fd, (struct sockaddr *)&un, sizeof(un))) {
-		perror("bind: " INITSOCK);
-		goto fail;
+		errmsg ="bind";
+		goto fail_errno;
 	}
 
-	if (chown(INITSOCK, 0, 0)) {
-		perror("chown: " INITSOCK);
-		goto fail;
+	if (flags & SOCK_FLAG_ROOT_ONLY) {
+		if (chown(path, 0, 0)) {
+			errmsg = "chown";
+			goto fail_errno;
+		}
+
+		if (chmod(path, 0770)) {
+			errmsg = "chmod";
+			goto fail_errno;
+		}
+	} else if (flags & SOCK_FLAG_EVERYONE) {
+		if (chmod(path, 0777)) {
+			errmsg = "chmod";
+			goto fail_errno;
+		}
 	}
 
-	if (chmod(INITSOCK, 0770)) {
-		perror("chmod: " INITSOCK);
-		goto fail;
-	}
-
-	if (listen(fd, 10)) {
-		perror("listen");
-		goto fail;
+	if (!(flags & SOCK_FLAG_DGRAM)) {
+		if (listen(fd, 10)) {
+			errmsg = "listen";
+			goto fail_errno;
+		}
 	}
 
 	return fd;
-fail:
+fail_errno:
+	fprintf(stderr, "%s: %s: %s\n", path, errmsg, strerror(errno));
 	close(fd);
-	unlink(INITSOCK);
+	unlink(path);
 	return -1;
 }