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-rw-r--r--qrap.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/qrap.c b/qrap.c
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index 0000000..b246a7e
--- /dev/null
+++ b/qrap.c
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+/* MERD - MacVTap Egress and Routing Daemon
+ *
+ * qrap.c - qemu wrapper connecting UNIX domain socket to tap file descriptor
+ *
+ * Author: Stefano Brivio <sbrivio@redhat.com>
+ * License: GPLv2
+ *
+ * TODO: Implement this functionality directly in qemu: we have TCP and UDP
+ * socket back-ends already.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <errno.h>
+#include <limits.h>
+
+#include "merd.h"
+
+/**
+ * usage() - Print usage and exit
+ * @name: Executable name
+ */
+void usage(const char *name)
+{
+ fprintf(stderr, "Usage: %s FDNUM QEMU_CMD ...\n", name);
+
+ exit(EXIT_FAILURE);
+}
+
+/**
+ * main() - Entry point and main loop
+ * @argc: Argument count
+ * @argv: File descriptor number, then qemu with arguments
+ *
+ * Return: 0 once interrupted, non-zero on failure
+ */
+int main(int argc, char **argv)
+{
+ struct sockaddr_un addr = {
+ .sun_family = AF_UNIX,
+ .sun_path = UNIX_SOCK_PATH,
+ };
+ long fd;
+ int s;
+
+ if (argc < 3)
+ usage(argv[0]);
+
+ fd = strtol(argv[1], NULL, 0);
+ if (fd < 3 || fd > INT_MAX || errno)
+ usage(argv[0]);
+
+ s = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (s < 0) {
+ perror("socket");
+ exit(EXIT_FAILURE);
+ }
+
+ if (connect(s, (const struct sockaddr *)&addr, sizeof(addr)) < 0) {
+ perror("connect");
+ exit(EXIT_FAILURE);
+ }
+
+ if (dup2(s, (int)fd) < 0) {
+ perror("dup");
+ exit(EXIT_FAILURE);
+ }
+
+ close(s);
+
+ execvp(argv[2], argv + 2);
+ perror("execvp");
+
+ return EXIT_FAILURE;
+}