1 files changed, 121 insertions, 0 deletions
diff --git a/frida_mode/src/seccomp/seccomp_socket.c b/frida_mode/src/seccomp/seccomp_socket.c
new file mode 100644
index 00000000..ca42e158
--- /dev/null
+++ b/frida_mode/src/seccomp/seccomp_socket.c
@@ -0,0 +1,121 @@
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include "debug.h"
+
+#include "seccomp.h"
+
+union cmsg {
+
+  char           buf[CMSG_SPACE(sizeof(int))];
+  struct cmsghdr hdr;
+
+};
+
+void seccomp_socket_create(int *sock) {
+
+  int tmp_sock[2] = {-1, -1};
+  if (socketpair(AF_UNIX, SOCK_STREAM, 0, tmp_sock) < 0) {
+
+    FATAL("socketpair");
+
+  }
+
+  if (dup2(tmp_sock[STDIN_FILENO], SECCOMP_SOCKET_RECV_FD) < 0) {
+
+    FATAL("seccomp_socket_create - dup2 (1)");
+
+  }
+
+  if (dup2(tmp_sock[STDOUT_FILENO], SECCOMP_SOCKET_SEND_FD) < 0) {
+
+    FATAL("seccomp_socket_create - dup2 (1)");
+
+  }
+
+  if (close(tmp_sock[STDIN_FILENO]) < 0) {
+
+    FATAL("seccomp_socket_create - close (1)");
+
+  }
+
+  if (close(tmp_sock[STDOUT_FILENO]) < 0) {
+
+    FATAL("seccomp_socket_create - close (2)");
+
+  }
+
+  sock[STDIN_FILENO] = SECCOMP_SOCKET_RECV_FD;
+  sock[STDOUT_FILENO] = SECCOMP_SOCKET_SEND_FD;
+
+}
+
+void seccomp_socket_send(int sockfd, int fd) {
+
+  int          data = 12345;
+  struct iovec iov = {.iov_base = &data, .iov_len = sizeof(data)};
+  union cmsg   control_msg = {.hdr = {
+
+                                .cmsg_len = CMSG_LEN(sizeof(int)),
+                                .cmsg_level = SOL_SOCKET,
+                                .cmsg_type = SCM_RIGHTS,
+
+                            }};
+
+  struct msghdr message = {.msg_control = control_msg.buf,
+                           .msg_controllen = sizeof(control_msg.buf),
+                           .msg_flags = 0,
+                           .msg_iov = &iov,
+                           .msg_iovlen = 1,
+                           .msg_name = NULL,
+                           .msg_namelen = 0};
+
+  memcpy(CMSG_DATA(&control_msg.hdr), &fd, sizeof(int));
+
+  if (sendmsg(sockfd, &message, 0) == -1) { FATAL("sendmsg"); }
+
+}
+
+int seccomp_socket_recv(int sockfd) {
+
+  int           data;
+  struct iovec  iov = {.iov_base = &data, .iov_len = sizeof(data)};
+  union cmsg    control_msg = {0};
+  struct msghdr message = {.msg_control = control_msg.buf,
+                           .msg_controllen = sizeof(control_msg.buf),
+                           .msg_flags = 0,
+                           .msg_iov = &iov,
+                           .msg_iovlen = 1,
+                           .msg_name = NULL,
+                           .msg_namelen = 0};
+
+  int fd;
+
+  if (recvmsg(sockfd, &message, 0) < 0) { FATAL("recvmsg"); }
+
+  if (control_msg.hdr.cmsg_len != CMSG_LEN(sizeof(int))) {
+
+    FATAL("control_msg.hdr.cmsg_len");
+
+  }
+
+  if (control_msg.hdr.cmsg_level != SOL_SOCKET) {
+
+    FATAL("control_msg.hdr.cmsg_level");
+
+  }
+
+  if (control_msg.hdr.cmsg_type != SCM_RIGHTS) {
+
+    FATAL("control_msg.hdr.cmsg_type");
+
+  }
+
+  memcpy(&fd, CMSG_DATA(&control_msg.hdr), sizeof(int));
+
+  return fd;
+
+}
+