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authorTavian Barnes <tavianator@tavianator.com>2019-02-01 12:57:00 -0500
committerTavian Barnes <tavianator@tavianator.com>2019-02-01 12:57:00 -0500
commit3a52c0e1f55d5dd03a00740c191569b9309c0ad6 (patch)
tree65785e4e2e4ff1a0a5ed4ec2f46895d559333616 /tests/mksock.c
parent23b55d03ddf69b5ab40dc338c419089e8c64930b (diff)
parent36330d7aab63ef2c202efb0d551f104ed6cefa17 (diff)
downloadbfs-3a52c0e1f55d5dd03a00740c191569b9309c0ad6.tar.xz
Merge branch 'improvements'
Diffstat (limited to 'tests/mksock.c')
-rw-r--r--tests/mksock.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/tests/mksock.c b/tests/mksock.c
new file mode 100644
index 0000000..a996d58
--- /dev/null
+++ b/tests/mksock.c
@@ -0,0 +1,131 @@
+/****************************************************************************
+ * bfs *
+ * Copyright (C) 2019 Tavian Barnes <tavianator@tavianator.com> *
+ * *
+ * Permission to use, copy, modify, and/or distribute this software for any *
+ * purpose with or without fee is hereby granted. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF *
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR *
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF *
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
+ ****************************************************************************/
+
+/**
+ * There's no standard Unix utility that creates a socket file, so this small
+ * program does the job.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+/**
+ * Print an error message.
+ */
+static void errmsg(const char *cmd, const char *path) {
+ fprintf(stderr, "%s: '%s': %s.\n", cmd, path, strerror(errno));
+}
+
+/**
+ * struct sockaddr_un::sun_path is very short, so we chdir() into the target
+ * directory before creating sockets in case the full path is too long but the
+ * file name is not.
+ */
+static int chdir_parent(const char *path) {
+ char *copy = strdup(path);
+ if (!copy) {
+ return -1;
+ }
+ const char *dir = dirname(copy);
+
+ int ret = chdir(dir);
+
+ int error = errno;
+ free(copy);
+ errno = error;
+
+ return ret;
+}
+
+/**
+ * Initialize a struct sockaddr_un with the right filename.
+ */
+static int init_sun(struct sockaddr_un *sock, const char *path) {
+ size_t len = strlen(path);
+ if (len == 0 || path[len - 1] == '/') {
+ errno = ENOENT;
+ return -1;
+ }
+
+ char *copy = strdup(path);
+ if (!copy) {
+ return -1;
+ }
+ const char *base = basename(copy);
+
+ len = strlen(base);
+ if (len >= sizeof(sock->sun_path)) {
+ free(copy);
+ errno = ENAMETOOLONG;
+ return -1;
+ }
+
+ sock->sun_family = AF_UNIX;
+ memcpy(sock->sun_path, base, len + 1);
+ free(copy);
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ const char *cmd = argc > 0 ? argv[0] : "mksock";
+
+ if (argc != 2) {
+ fprintf(stderr, "Usage: %s NAME\n", cmd);
+ return EXIT_FAILURE;
+ }
+
+ const char *path = argv[1];
+
+ if (chdir_parent(path) != 0) {
+ errmsg(cmd, path);
+ return EXIT_FAILURE;
+ }
+
+ struct sockaddr_un sock;
+ if (init_sun(&sock, path) != 0) {
+ errmsg(cmd, path);
+ return EXIT_FAILURE;
+ }
+
+ int fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (fd < 0) {
+ errmsg(cmd, path);
+ return EXIT_FAILURE;
+ }
+
+ int ret = EXIT_SUCCESS;
+
+ if (bind(fd, (struct sockaddr *)&sock, sizeof(sock)) != 0) {
+ errmsg(cmd, path);
+ ret = EXIT_FAILURE;
+ }
+
+ if (close(fd) != 0) {
+ errmsg(cmd, path);
+ ret = EXIT_FAILURE;
+ }
+
+ return ret;
+}