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-rw-r--r--kms/client/kms_client.c503
-rw-r--r--kms/client/kms_client.h24
2 files changed, 527 insertions, 0 deletions
diff --git a/kms/client/kms_client.c b/kms/client/kms_client.c
new file mode 100644
index 0000000..d7ddc78
--- /dev/null
+++ b/kms/client/kms_client.c
@@ -0,0 +1,503 @@
+#include "kms_client.h"
+#include "../../include/utils.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/wait.h>
+#include <poll.h>
+#include <sys/stat.h>
+#ifdef __linux__
+#include <sys/capability.h>
+#endif
+#ifdef __FreeBSD__
+#include <sys/sysctl.h>
+#endif
+
+#define GSR_SOCKET_PAIR_LOCAL 0
+#define GSR_SOCKET_PAIR_REMOTE 1
+
+static void cleanup_socket(gsr_kms_client *self, bool kill_server);
+static int gsr_kms_client_replace_connection(gsr_kms_client *self);
+
+static void close_fds(gsr_kms_response *response) {
+ for(int i = 0; i < response->num_items; ++i) {
+ for(int j = 0; j < response->items[i].num_dma_bufs; ++j) {
+ gsr_kms_response_dma_buf *dma_buf = &response->items[i].dma_buf[j];
+ if(dma_buf->fd > 0) {
+ close(dma_buf->fd);
+ dma_buf->fd = -1;
+ }
+ }
+ response->items[i].num_dma_bufs = 0;
+ }
+ response->num_items = 0;
+}
+
+static int send_msg_to_server(int server_fd, gsr_kms_request *request) {
+ struct iovec iov;
+ iov.iov_base = request;
+ iov.iov_len = sizeof(*request);
+
+ struct msghdr response_message = {0};
+ response_message.msg_iov = &iov;
+ response_message.msg_iovlen = 1;
+
+ char cmsgbuf[CMSG_SPACE(sizeof(int) * 1)];
+ memset(cmsgbuf, 0, sizeof(cmsgbuf));
+
+ if(request->new_connection_fd > 0) {
+ response_message.msg_control = cmsgbuf;
+ response_message.msg_controllen = sizeof(cmsgbuf);
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&response_message);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int) * 1);
+
+ int *fds = (int*)CMSG_DATA(cmsg);
+ fds[0] = request->new_connection_fd;
+
+ response_message.msg_controllen = cmsg->cmsg_len;
+ }
+
+ return sendmsg(server_fd, &response_message, 0);
+}
+
+static int recv_msg_from_server(int server_pid, int server_fd, gsr_kms_response *response) {
+ struct iovec iov;
+ iov.iov_base = response;
+ iov.iov_len = sizeof(*response);
+
+ struct msghdr response_message = {0};
+ response_message.msg_iov = &iov;
+ response_message.msg_iovlen = 1;
+
+ char cmsgbuf[CMSG_SPACE(sizeof(int) * GSR_KMS_MAX_ITEMS * GSR_KMS_MAX_DMA_BUFS)];
+ memset(cmsgbuf, 0, sizeof(cmsgbuf));
+ response_message.msg_control = cmsgbuf;
+ response_message.msg_controllen = sizeof(cmsgbuf);
+
+ int res = 0;
+ for(;;) {
+ res = recvmsg(server_fd, &response_message, MSG_DONTWAIT);
+ if(res <= 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
+ // If we are replacing the connection and closing the application at the same time
+ // then recvmsg can get stuck (because the server died), so we prevent that by doing
+ // non-blocking recvmsg and checking if the server died
+ int status = 0;
+ int wait_result = waitpid(server_pid, &status, WNOHANG);
+ if(wait_result != 0) {
+ res = -1;
+ break;
+ }
+ usleep(1000);
+ } else {
+ break;
+ }
+ }
+
+ if(res > 0 && response->num_items > 0) {
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&response_message);
+ if(cmsg) {
+ int *fds = (int*)CMSG_DATA(cmsg);
+ int fd_index = 0;
+ for(int i = 0; i < response->num_items; ++i) {
+ for(int j = 0; j < response->items[i].num_dma_bufs; ++j) {
+ gsr_kms_response_dma_buf *dma_buf = &response->items[i].dma_buf[j];
+ dma_buf->fd = fds[fd_index++];
+ }
+ }
+ } else {
+ close_fds(response);
+ }
+ }
+
+ return res;
+}
+
+/* We have to use $HOME because in flatpak there is no simple path that is accessible, read and write, that multiple flatpak instances can access */
+static bool create_socket_path(char *output_path, size_t output_path_size) {
+ const bool inside_flatpak = getenv("FLATPAK_ID") != NULL;
+ const char *home = getenv("HOME");
+ // Portable home with AppImage can cause the socket path to be longer than 108 characters (unix domain socket path max length).
+ // Using gsr-kms-socket in $HOME is only needed in flatpak, so use /tmp everywhere else instead.
+ if(!home || !inside_flatpak)
+ home = "/tmp";
+
+ char random_characters[11];
+ random_characters[10] = '\0';
+ if(!generate_random_characters_standard_alphabet(random_characters, 10))
+ return false;
+
+ snprintf(output_path, output_path_size, "%s/.gsr-kms-socket-%s", home, random_characters);
+ return true;
+}
+
+#ifdef __linux__
+static bool readlink_realpath(const char *filepath, char *buffer) {
+ char symlinked_path[PATH_MAX];
+ ssize_t bytes_written = readlink(filepath, symlinked_path, sizeof(symlinked_path) - 1);
+ if(bytes_written == -1 && errno == EINVAL) {
+ /* Not a symlink */
+ snprintf(symlinked_path, sizeof(symlinked_path), "%s", filepath);
+ } else if(bytes_written == -1) {
+ return false;
+ } else {
+ symlinked_path[bytes_written] = '\0';
+ }
+
+ if(!realpath(symlinked_path, buffer))
+ return false;
+
+ return true;
+}
+#endif
+
+static bool strcat_safe(char *str, int size, const char *str_to_add) {
+ const int str_len = strlen(str);
+ const int str_to_add_len = strlen(str_to_add);
+ if(str_len + str_to_add_len + 1 >= size)
+ return false;
+
+ memcpy(str + str_len, str_to_add, str_to_add_len);
+ str[str_len + str_to_add_len] = '\0';
+ return true;
+}
+
+static void file_get_directory(char *filepath) {
+ char *end = strrchr(filepath, '/');
+ if(end == NULL)
+ filepath[0] = '\0';
+ else
+ *end = '\0';
+}
+
+static bool find_program_in_path(const char *program_name, char *filepath, int filepath_len) {
+ const char *path = getenv("PATH");
+ if(!path)
+ return false;
+
+ int program_name_len = strlen(program_name);
+ const char *end = path + strlen(path);
+ while(path != end) {
+ const char *part_end = strchr(path, ':');
+ const char *next = part_end;
+ if(part_end) {
+ next = part_end + 1;
+ } else {
+ part_end = end;
+ next = end;
+ }
+
+ int len = part_end - path;
+ if(len + 1 + program_name_len < filepath_len) {
+ memcpy(filepath, path, len);
+ filepath[len] = '/';
+ memcpy(filepath + len + 1, program_name, program_name_len);
+ filepath[len + 1 + program_name_len] = '\0';
+
+ if(access(filepath, F_OK) == 0)
+ return true;
+ }
+
+ path = next;
+ }
+
+ return false;
+}
+
+int gsr_kms_client_init(gsr_kms_client *self, const char *card_path) {
+ int result = -1;
+ self->kms_server_pid = -1;
+ self->initial_socket_fd = -1;
+ self->initial_client_fd = -1;
+ self->initial_socket_path[0] = '\0';
+ self->socket_pair[0] = -1;
+ self->socket_pair[1] = -1;
+ struct sockaddr_un local_addr = {0};
+ struct sockaddr_un remote_addr = {0};
+
+ if(!create_socket_path(self->initial_socket_path, sizeof(self->initial_socket_path))) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: failed to create path to kms socket\n");
+ return -1;
+ }
+
+ char server_filepath[PATH_MAX];
+#ifdef __linux__
+ if(!readlink_realpath("/proc/self/exe", server_filepath)) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: failed to resolve /proc/self/exe\n");
+ return -1;
+ }
+
+#elif defined(__FreeBSD__)
+ int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, getpid() };
+ size_t size = PATH_MAX;
+
+ if (sysctl(mib, 4, server_filepath, &size, NULL, 0) != 0) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: failed to resolve pathname using sysctl\n");
+ return -1;
+ }
+
+#else
+#error "Implement it by yourself"
+#endif
+ file_get_directory(server_filepath);
+
+ if(!strcat_safe(server_filepath, sizeof(server_filepath), "/gsr-kms-server")) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: gsr-kms-server path too long\n");
+ return -1;
+ }
+
+ if(access(server_filepath, F_OK) != 0) {
+ fprintf(stderr, "gsr info: gsr_kms_client_init: gsr-kms-server is not installed in the same directory as gpu-screen-recorder (%s not found), looking for gsr-kms-server in PATH instead\n", server_filepath);
+ if(!find_program_in_path("gsr-kms-server", server_filepath, sizeof(server_filepath)) || access(server_filepath, F_OK) != 0) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: gsr-kms-server was not found in PATH. Please install gpu-screen-recorder properly\n");
+ return -1;
+ }
+ }
+
+ fprintf(stderr, "gsr info: gsr_kms_client_init: setting up connection to %s\n", server_filepath);
+
+ const bool inside_flatpak = getenv("FLATPAK_ID") != NULL;
+ const char *home = getenv("HOME");
+ if(!home)
+ home = "/tmp";
+
+ bool has_perm = 0;
+ if(geteuid() == 0) {
+ has_perm = true;
+ } else {
+#ifdef __linux__
+ cap_t kms_server_cap = cap_get_file(server_filepath);
+ if(kms_server_cap) {
+ cap_flag_value_t res = CAP_CLEAR;
+ cap_get_flag(kms_server_cap, CAP_SYS_ADMIN, CAP_PERMITTED, &res);
+ if(res == CAP_SET) {
+ //fprintf(stderr, "has permission!\n");
+ has_perm = true;
+ } else {
+ //fprintf(stderr, "No permission:(\n");
+ }
+ cap_free(kms_server_cap);
+ } else if(!inside_flatpak) {
+ if(errno == ENODATA)
+ fprintf(stderr, "gsr info: gsr_kms_client_init: gsr-kms-server is missing sys_admin cap and will require root authentication. To bypass this automatically, run: sudo setcap cap_sys_admin+ep '%s'\n", server_filepath);
+ else
+ fprintf(stderr, "gsr info: gsr_kms_client_init: failed to get cap\n");
+ }
+#else
+ fprintf(stderr, "gsr info: gsr_kms_client_init: platform doesn't support cap\n");
+#endif
+ }
+
+ if(socketpair(AF_UNIX, SOCK_STREAM, 0, self->socket_pair) == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: socketpair failed, error: %s\n", strerror(errno));
+ goto err;
+ }
+
+ self->initial_socket_fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if(self->initial_socket_fd == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: socket failed, error: %s\n", strerror(errno));
+ goto err;
+ }
+
+ local_addr.sun_family = AF_UNIX;
+ snprintf(local_addr.sun_path, sizeof(local_addr.sun_path), "%s", (const char*)self->initial_socket_path);
+
+ const mode_t prev_mask = umask(0000);
+ const int bind_res = bind(self->initial_socket_fd, (struct sockaddr*)&local_addr, sizeof(local_addr.sun_family) + strlen(local_addr.sun_path));
+ umask(prev_mask);
+
+ if(bind_res == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: failed to bind socket, error: %s\n", strerror(errno));
+ goto err;
+ }
+
+ if(listen(self->initial_socket_fd, 1) == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: failed to listen on socket, error: %s\n", strerror(errno));
+ goto err;
+ }
+
+ pid_t pid = fork();
+ if(pid == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: fork failed, error: %s\n", strerror(errno));
+ goto err;
+ } else if(pid == 0) { /* child */
+ if(inside_flatpak) {
+ const char *args[] = { "flatpak-spawn", "--host", "/var/lib/flatpak/app/com.dec05eba.gpu_screen_recorder/current/active/files/bin/kms-server-proxy", self->initial_socket_path, card_path, home, NULL };
+ execvp(args[0], (char *const*)args);
+ } else if(has_perm) {
+ const char *args[] = { server_filepath, self->initial_socket_path, card_path, NULL };
+ execvp(args[0], (char *const*)args);
+ } else {
+ const char *args[] = { "pkexec", server_filepath, self->initial_socket_path, card_path, NULL };
+ execvp(args[0], (char *const*)args);
+ }
+ fprintf(stderr, "gsr error: gsr_kms_client_init: failed to launch \"gsr-kms-server\", error: %s\n", strerror(errno));
+ _exit(127);
+ } else { /* parent */
+ self->kms_server_pid = pid;
+ }
+
+ // We need this dumb-shit retardation with unix domain socket and then replace it with socketpair because
+ // pkexec doesn't work with socketpair................
+ fprintf(stderr, "gsr info: gsr_kms_client_init: waiting for server to connect\n");
+ struct pollfd poll_fd = {
+ .fd = self->initial_socket_fd,
+ .events = POLLIN,
+ .revents = 0
+ };
+ for(;;) {
+ int poll_res = poll(&poll_fd, 1, 100);
+ if(poll_res > 0 && (poll_fd.revents & POLLIN)) {
+ socklen_t sock_len = 0;
+ self->initial_client_fd = accept(self->initial_socket_fd, (struct sockaddr*)&remote_addr, &sock_len);
+ if(self->initial_client_fd == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: accept failed on socket, error: %s\n", strerror(errno));
+ goto err;
+ }
+ break;
+ } else {
+ int status = 0;
+ int wait_result = waitpid(self->kms_server_pid, &status, WNOHANG);
+ if(wait_result != 0) {
+ int exit_code = -1;
+ if(WIFEXITED(status))
+ exit_code = WEXITSTATUS(status);
+ fprintf(stderr, "gsr error: gsr_kms_client_init: kms server died or never started, exit code: %d\n", exit_code);
+ self->kms_server_pid = -1;
+ if(exit_code != 0)
+ result = exit_code;
+ goto err;
+ }
+ }
+ }
+ fprintf(stderr, "gsr info: gsr_kms_client_init: server connected\n");
+
+ fprintf(stderr, "gsr info: replacing file-backed unix domain socket with socketpair\n");
+ if(gsr_kms_client_replace_connection(self) != 0)
+ goto err;
+
+ cleanup_socket(self, false);
+ fprintf(stderr, "gsr info: using socketpair\n");
+
+ return 0;
+
+ err:
+ gsr_kms_client_deinit(self);
+ return result;
+}
+
+void cleanup_socket(gsr_kms_client *self, bool kill_server) {
+ if(self->initial_client_fd > 0) {
+ close(self->initial_client_fd);
+ self->initial_client_fd = -1;
+ }
+
+ if(self->initial_socket_fd > 0) {
+ close(self->initial_socket_fd);
+ self->initial_socket_fd = -1;
+ }
+
+ if(kill_server) {
+ for(int i = 0; i < 2; ++i) {
+ if(self->socket_pair[i] > 0) {
+ close(self->socket_pair[i]);
+ self->socket_pair[i] = -1;
+ }
+ }
+ }
+
+ if(kill_server && self->kms_server_pid > 0) {
+ kill(self->kms_server_pid, SIGKILL);
+ // TODO:
+ //int status;
+ //waitpid(self->kms_server_pid, &status, 0);
+ self->kms_server_pid = -1;
+ }
+
+ if(self->initial_socket_path[0] != '\0') {
+ remove(self->initial_socket_path);
+ self->initial_socket_path[0] = '\0';
+ }
+}
+
+void gsr_kms_client_deinit(gsr_kms_client *self) {
+ cleanup_socket(self, true);
+}
+
+int gsr_kms_client_replace_connection(gsr_kms_client *self) {
+ gsr_kms_response response;
+ response.version = 0;
+ response.result = KMS_RESULT_FAILED_TO_SEND;
+ response.err_msg[0] = '\0';
+
+ gsr_kms_request request;
+ request.version = GSR_KMS_PROTOCOL_VERSION;
+ request.type = KMS_REQUEST_TYPE_REPLACE_CONNECTION;
+ request.new_connection_fd = self->socket_pair[GSR_SOCKET_PAIR_REMOTE];
+ if(send_msg_to_server(self->initial_client_fd, &request) == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_replace_connection: failed to send request message to server\n");
+ return -1;
+ }
+
+ const int recv_res = recv_msg_from_server(self->kms_server_pid, self->socket_pair[GSR_SOCKET_PAIR_LOCAL], &response);
+ if(recv_res == 0) {
+ fprintf(stderr, "gsr warning: gsr_kms_client_replace_connection: kms server shut down\n");
+ return -1;
+ } else if(recv_res == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_replace_connection: failed to receive response\n");
+ return -1;
+ }
+
+ if(response.version != GSR_KMS_PROTOCOL_VERSION) {
+ fprintf(stderr, "gsr error: gsr_kms_client_replace_connection: expected gsr-kms-server protocol version to be %u, but it's %u. please reinstall gpu screen recorder\n", GSR_KMS_PROTOCOL_VERSION, response.version);
+ /*close_fds(response);*/
+ return -1;
+ }
+
+ return 0;
+}
+
+int gsr_kms_client_get_kms(gsr_kms_client *self, gsr_kms_response *response) {
+ response->version = 0;
+ response->result = KMS_RESULT_FAILED_TO_SEND;
+ response->err_msg[0] = '\0';
+
+ gsr_kms_request request;
+ request.version = GSR_KMS_PROTOCOL_VERSION;
+ request.type = KMS_REQUEST_TYPE_GET_KMS;
+ request.new_connection_fd = 0;
+ if(send_msg_to_server(self->socket_pair[GSR_SOCKET_PAIR_LOCAL], &request) == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_get_kms: failed to send request message to server\n");
+ strcpy(response->err_msg, "failed to send");
+ return -1;
+ }
+
+ const int recv_res = recv_msg_from_server(self->kms_server_pid, self->socket_pair[GSR_SOCKET_PAIR_LOCAL], response);
+ if(recv_res == 0) {
+ fprintf(stderr, "gsr warning: gsr_kms_client_get_kms: kms server shut down\n");
+ strcpy(response->err_msg, "failed to receive");
+ return -1;
+ } else if(recv_res == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_get_kms: failed to receive response\n");
+ strcpy(response->err_msg, "failed to receive");
+ return -1;
+ }
+
+ if(response->version != GSR_KMS_PROTOCOL_VERSION) {
+ fprintf(stderr, "gsr error: gsr_kms_client_get_kms: expected gsr-kms-server protocol version to be %u, but it's %u. please reinstall gpu screen recorder\n", GSR_KMS_PROTOCOL_VERSION, response->version);
+ /*close_fds(response);*/
+ strcpy(response->err_msg, "mismatching protocol version");
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/kms/client/kms_client.h b/kms/client/kms_client.h
new file mode 100644
index 0000000..2d18848
--- /dev/null
+++ b/kms/client/kms_client.h
@@ -0,0 +1,24 @@
+#ifndef GSR_KMS_CLIENT_H
+#define GSR_KMS_CLIENT_H
+
+#include "../kms_shared.h"
+#include <sys/types.h>
+#include <limits.h>
+
+typedef struct gsr_kms_client gsr_kms_client;
+
+struct gsr_kms_client {
+ pid_t kms_server_pid;
+ int initial_socket_fd;
+ int initial_client_fd;
+ char initial_socket_path[PATH_MAX];
+ int socket_pair[2];
+};
+
+/* |card_path| should be a path to card, for example /dev/dri/card0 */
+int gsr_kms_client_init(gsr_kms_client *self, const char *card_path);
+void gsr_kms_client_deinit(gsr_kms_client *self);
+
+int gsr_kms_client_get_kms(gsr_kms_client *self, gsr_kms_response *response);
+
+#endif /* #define GSR_KMS_CLIENT_H */
generated by cgit v1.2.3-70-g09d2 (git 2.48.1) at 2025-07-07 08:02:59 +0000