1 files changed, 78 insertions, 0 deletions

diff --git a/samples/bpf/test_probe_write_user_user.c b/samples/bpf/test_probe_write_user_user.c
new file mode 100644
index 000000000000..a44bf347bedd
--- /dev/null
+++ b/samples/bpf/test_probe_write_user_user.c
@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <assert.h>
+#include <linux/bpf.h>
+#include <unistd.h>
+#include "libbpf.h"
+#include "bpf_load.h"
+#include <sys/socket.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+int main(int ac, char **argv)
+{
+        int serverfd, serverconnfd, clientfd;
+        socklen_t sockaddr_len;
+        struct sockaddr serv_addr, mapped_addr, tmp_addr;
+        struct sockaddr_in *serv_addr_in, *mapped_addr_in, *tmp_addr_in;
+        char filename[256];
+        char *ip;
+
+        serv_addr_in = (struct sockaddr_in *)&serv_addr;
+        mapped_addr_in = (struct sockaddr_in *)&mapped_addr;
+        tmp_addr_in = (struct sockaddr_in *)&tmp_addr;
+
+        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+
+        if (load_bpf_file(filename)) {
+                printf("%s", bpf_log_buf);
+                return 1;
+        }
+
+        assert((serverfd = socket(AF_INET, SOCK_STREAM, 0)) > 0);
+        assert((clientfd = socket(AF_INET, SOCK_STREAM, 0)) > 0);
+
+        /* Bind server to ephemeral port on lo */
+        memset(&serv_addr, 0, sizeof(serv_addr));
+        serv_addr_in->sin_family = AF_INET;
+        serv_addr_in->sin_port = 0;
+        serv_addr_in->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+        assert(bind(serverfd, &serv_addr, sizeof(serv_addr)) == 0);
+
+        sockaddr_len = sizeof(serv_addr);
+        assert(getsockname(serverfd, &serv_addr, &sockaddr_len) == 0);
+        ip = inet_ntoa(serv_addr_in->sin_addr);
+        printf("Server bound to: %s:%d\n", ip, ntohs(serv_addr_in->sin_port));
+
+        memset(&mapped_addr, 0, sizeof(mapped_addr));
+        mapped_addr_in->sin_family = AF_INET;
+        mapped_addr_in->sin_port = htons(5555);
+        mapped_addr_in->sin_addr.s_addr = inet_addr("255.255.255.255");
+
+        assert(!bpf_update_elem(map_fd[0], &mapped_addr, &serv_addr, BPF_ANY));
+
+        assert(listen(serverfd, 5) == 0);
+
+        ip = inet_ntoa(mapped_addr_in->sin_addr);
+        printf("Client connecting to: %s:%d\n",
+               ip, ntohs(mapped_addr_in->sin_port));
+        assert(connect(clientfd, &mapped_addr, sizeof(mapped_addr)) == 0);
+
+        sockaddr_len = sizeof(tmp_addr);
+        ip = inet_ntoa(tmp_addr_in->sin_addr);
+        assert((serverconnfd = accept(serverfd, &tmp_addr, &sockaddr_len)) > 0);
+        printf("Server received connection from: %s:%d\n",
+               ip, ntohs(tmp_addr_in->sin_port));
+
+        sockaddr_len = sizeof(tmp_addr);
+        assert(getpeername(clientfd, &tmp_addr, &sockaddr_len) == 0);
+        ip = inet_ntoa(tmp_addr_in->sin_addr);
+        printf("Client's peer address: %s:%d\n",
+               ip, ntohs(tmp_addr_in->sin_port));
+
+        /* Is the server's getsockname = the socket getpeername */
+        assert(memcmp(&serv_addr, &tmp_addr, sizeof(struct sockaddr_in)) == 0);
+
+        return 0;
+}