[Libguestfs] [libnbd PATCH 3/6] macOS: Simple cloexec/nonblock fix
Martin Kletzander
mkletzan at redhat.com
Tue Jul 13 21:26:05 UTC 2021
This is the most trivial way to fix the issue with macOS not having SOCK_CLOEXEC
and SOCK_NONBLOCK. There is not much better way, so this is the only way to
make it work on such platform(s).
Signed-off-by: Martin Kletzander <mkletzan at redhat.com>
---
lib/internal.h | 3 +
generator/states-connect-socket-activation.c | 2 +-
generator/states-connect.c | 11 ++--
lib/utils.c | 68 ++++++++++++++++++++
fuzzing/libnbd-fuzz-wrapper.c | 30 ++++++++-
fuzzing/libnbd-libfuzzer-test.c | 30 ++++++++-
6 files changed, 136 insertions(+), 8 deletions(-)
diff --git a/lib/internal.h b/lib/internal.h
index 01f9d8ab5fea..8a4c189abe65 100644
--- a/lib/internal.h
+++ b/lib/internal.h
@@ -467,4 +467,7 @@ extern char *nbd_internal_printable_buffer (const void *buf, size_t count);
extern char *nbd_internal_printable_string (const char *str);
extern char *nbd_internal_printable_string_list (char **list);
+extern int nbd_internal_socket(int domain, int type, int protocol, bool nonblock);
+extern int nbd_internal_socketpair(int domain, int type, int protocol, int *fds);
+
#endif /* LIBNBD_INTERNAL_H */
diff --git a/generator/states-connect-socket-activation.c b/generator/states-connect-socket-activation.c
index e601c9bb56be..8a2add312bc4 100644
--- a/generator/states-connect-socket-activation.c
+++ b/generator/states-connect-socket-activation.c
@@ -131,7 +131,7 @@ STATE_MACHINE {
return 0;
}
- s = socket (AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
+ s = nbd_internal_socket (AF_UNIX, SOCK_STREAM, 0, false);
if (s == -1) {
SET_NEXT_STATE (%.DEAD);
set_error (errno, "socket");
diff --git a/generator/states-connect.c b/generator/states-connect.c
index fcac86f36a34..8de12183d627 100644
--- a/generator/states-connect.c
+++ b/generator/states-connect.c
@@ -52,7 +52,7 @@ STATE_MACHINE {
assert (!h->sock);
family = h->connaddr.ss_family;
- fd = socket (family, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0);
+ fd = nbd_internal_socket (family, SOCK_STREAM, 0, true);
if (fd == -1) {
SET_NEXT_STATE (%.DEAD);
set_error (errno, "socket");
@@ -162,9 +162,10 @@ STATE_MACHINE {
return -1;
}
- fd = socket (h->rp->ai_family,
- h->rp->ai_socktype|SOCK_NONBLOCK|SOCK_CLOEXEC,
- h->rp->ai_protocol);
+ fd = nbd_internal_socket (h->rp->ai_family,
+ h->rp->ai_socktype,
+ h->rp->ai_protocol,
+ true);
if (fd == -1) {
SET_NEXT_STATE (%NEXT_ADDRESS);
return 0;
@@ -227,7 +228,7 @@ STATE_MACHINE {
assert (!h->sock);
assert (h->argv.ptr);
assert (h->argv.ptr[0]);
- if (socketpair (AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, sv) == -1) {
+ if (nbd_internal_socketpair (AF_UNIX, SOCK_STREAM, 0, sv) == -1) {
SET_NEXT_STATE (%.DEAD);
set_error (errno, "socketpair");
return 0;
diff --git a/lib/utils.c b/lib/utils.c
index 260fd6a25796..972cbc5208a7 100644
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -24,6 +24,7 @@
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
+#include <fcntl.h>
#include "minmax.h"
@@ -258,3 +259,70 @@ nbd_internal_printable_string_list (char **list)
return s;
}
+
+int nbd_internal_socket(int domain,
+ int type,
+ int protocol,
+ bool nonblock)
+{
+ int fd;
+
+#ifdef __APPLE__
+ int flags;
+#else
+ type |= SOCK_CLOEXEC;
+ if (nonblock)
+ type |= SOCK_NONBLOCK;
+#endif
+
+ fd = socket (domain, type, protocol);
+
+#ifdef __APPLE__
+ if (fd == -1)
+ return -1;
+
+ if (fcntl (fd, F_SETFD, FD_CLOEXEC) == -1) {
+ close(fd);
+ return -1;
+ }
+
+ if (nonblock) {
+ flags = fcntl (fd, F_GETFL, 0);
+ if (flags == -1 ||
+ fcntl (fd, F_SETFL, flags|O_NONBLOCK) == -1) {
+ close(fd);
+ return -1;
+ }
+ }
+#endif
+
+ return fd;
+}
+
+int
+nbd_internal_socketpair (int domain, int type, int protocol, int *fds)
+{
+ int ret;
+
+#ifdef __APPLE__
+ size_t i;
+#else
+ type |= SOCK_CLOEXEC;
+#endif
+
+ ret = socketpair (domain, type, protocol, fds);
+
+#ifdef __APPLE__
+ if (ret == 0) {
+ for (i = 0; i < 2; i++) {
+ if (fcntl (fds[i], F_SETFD, FD_CLOEXEC) == -1) {
+ close(fds[0]);
+ close(fds[1]);
+ return -1;
+ }
+ }
+ }
+#endif
+
+ return ret;
+}
diff --git a/fuzzing/libnbd-fuzz-wrapper.c b/fuzzing/libnbd-fuzz-wrapper.c
index 99a6d803258f..3d127e673e9e 100644
--- a/fuzzing/libnbd-fuzz-wrapper.c
+++ b/fuzzing/libnbd-fuzz-wrapper.c
@@ -41,6 +41,34 @@
static void client (int s);
static void server (int fd, int s);
+static int
+get_socketpair (int domain, int type, int protocol, int *fds)
+{
+ int ret;
+
+#ifdef __APPLE__
+ size_t i;
+#else
+ type |= SOCK_CLOEXEC;
+#endif
+
+ ret = socketpair (domain, type, protocol, fds);
+
+#ifdef __APPLE__
+ if (ret == 0) {
+ for (i = 0; i < 2; i++) {
+ if (fcntl (fds[i], F_SETFD, FD_CLOEXEC) == -1) {
+ close(fds[0]);
+ close(fds[1]);
+ return -1;
+ }
+ }
+ }
+#endif
+
+ return ret;
+}
+
int
main (int argc, char *argv[])
{
@@ -61,7 +89,7 @@ main (int argc, char *argv[])
}
/* Create a connected socket. */
- if (socketpair (AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, sv) == -1) {
+ if (get_socketpair (AF_UNIX, SOCK_STREAM, 0, sv) == -1) {
perror ("socketpair");
exit (EXIT_FAILURE);
}
diff --git a/fuzzing/libnbd-libfuzzer-test.c b/fuzzing/libnbd-libfuzzer-test.c
index 5ee29b877bdb..0bf988ee8398 100644
--- a/fuzzing/libnbd-libfuzzer-test.c
+++ b/fuzzing/libnbd-libfuzzer-test.c
@@ -41,6 +41,34 @@
static void client (int sock);
static void server (const uint8_t *data, size_t size, int sock);
+static int
+get_socketpair (int domain, int type, int protocol, int *fds)
+{
+ int ret;
+
+#ifdef __APPLE__
+ size_t i;
+#else
+ type |= SOCK_CLOEXEC;
+#endif
+
+ ret = socketpair (domain, type, protocol, fds);
+
+#ifdef __APPLE__
+ if (ret == 0) {
+ for (i = 0; i < 2; i++) {
+ if (fcntl (fds[i], F_SETFD, FD_CLOEXEC) == -1) {
+ close(fds[0]);
+ close(fds[1]);
+ return -1;
+ }
+ }
+ }
+#endif
+
+ return ret;
+}
+
/* This is the entry point called by libFuzzer. */
int
LLVMFuzzerTestOneInput (const uint8_t *data, size_t size)
@@ -49,7 +77,7 @@ LLVMFuzzerTestOneInput (const uint8_t *data, size_t size)
int sv[2], r, status;
/* Create a connected socket. */
- if (socketpair (AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, sv) == -1) {
+ if (nbd_internal_socketpair (AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, sv) == -1) {
perror ("socketpair");
exit (EXIT_FAILURE);
}
--
2.32.0
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