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Diffstat (limited to 'kms')
-rw-r--r--kms/client/kms_client.c245
-rw-r--r--kms/client/kms_client.h21
-rw-r--r--kms/kms_shared.h45
-rw-r--r--kms/server/.gitignore1
-rw-r--r--kms/server/kms_server.c244
-rw-r--r--kms/server/project.conf8
6 files changed, 564 insertions, 0 deletions
diff --git a/kms/client/kms_client.c b/kms/client/kms_client.c
new file mode 100644
index 0000000..2b59836
--- /dev/null
+++ b/kms/client/kms_client.c
@@ -0,0 +1,245 @@
+#include "kms_client.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/wait.h>
+#include <sys/capability.h>
+
+static bool is_inside_flatpak(void) {
+ return getenv("FLATPAK_ID") != NULL;
+}
+
+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 request_message = {0};
+ request_message.msg_iov = &iov;
+ request_message.msg_iovlen = 1;
+
+ return sendmsg(server_fd, &request_message, 0);
+}
+
+static int recv_msg_from_server(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))];
+ memset(cmsgbuf, 0, sizeof(cmsgbuf));
+ response_message.msg_control = cmsgbuf;
+ response_message.msg_controllen = sizeof(cmsgbuf);
+
+ int res = recvmsg(server_fd, &response_message, MSG_WAITALL);
+ if(res <= 0)
+ return res;
+
+ if(response->result == KMS_RESULT_OK)
+ response->data.fd.fd = 0;
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&response_message);
+ if(cmsg) {
+ fprintf(stderr, "got cmsg, %d\n", cmsg->cmsg_type);
+ if(cmsg->cmsg_type == SCM_RIGHTS) {
+ int kms_fd = 0;
+ memcpy(&kms_fd, CMSG_DATA(cmsg), sizeof(int));
+ fprintf(stderr, "kms fd: %d\n", kms_fd);
+ response->data.fd.fd = kms_fd;
+ }
+ }
+
+ return res;
+}
+
+int gsr_kms_client_init(gsr_kms_client *self, const char *card_path, const char *program_dir) {
+ self->kms_server_pid = -1;
+ self->card_path = NULL;
+ self->socket_fd = -1;
+ self->client_fd = -1;
+ self->socket_path[0] = '\0';
+ struct sockaddr_un local_addr = {0};
+ struct sockaddr_un remote_addr = {0};
+
+ bool inside_flatpak = is_inside_flatpak();
+ char server_filepath[PATH_MAX];
+ snprintf(server_filepath, sizeof(server_filepath), "%s/%s", program_dir, "gsr-kms-server");
+ if(access(server_filepath, F_OK) != 0 || inside_flatpak)
+ snprintf(server_filepath, sizeof(server_filepath), "gsr-kms-server"); // Assume gsr-kms-server is in $PATH
+
+ bool has_perm = 0;
+ if(geteuid() == 0) {
+ has_perm = true;
+ } else {
+ cap_t kms_server_cap = cap_get_file(server_filepath);
+ if(kms_server_cap) {
+ cap_flag_value_t res = 0;
+ 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(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");
+ }
+ }
+
+ fprintf(stderr, "gsr info: gsr server path: %s, exists: %s\n", server_filepath, access(server_filepath, F_OK) == 0 ? "yes" : "no");
+
+ self->card_path = strdup(card_path);
+ if(!self->card_path) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: failed to duplicate card_path\n");
+ goto err;
+ }
+
+ strcpy(self->socket_path, "/tmp/gsr-kms-socket-XXXXXX");
+ if(!tmpnam(self->socket_path)) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: mkstemp failed, error: %s\n", strerror(errno));
+ goto err;
+ }
+
+ self->socket_fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if(self->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;
+ strncpy(local_addr.sun_path, self->socket_path, sizeof(local_addr.sun_path));
+ if(bind(self->socket_fd, (struct sockaddr*)&local_addr, sizeof(local_addr.sun_family) + strlen(local_addr.sun_path)) == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: failed to bind socket, error: %s\n", strerror(errno));
+ goto err;
+ }
+
+ if(listen(self->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(has_perm) {
+ const char *args[] = { server_filepath, self->socket_path, NULL };
+ execvp(args[0], (char *const*)args);
+ } else if(inside_flatpak) {
+ const char *args[] = { "flatpak-spawn", "--host", "pkexec", server_filepath, self->socket_path, NULL };
+ execvp(args[0], (char *const*)args);
+ } else {
+ const char *args[] = { "pkexec", server_filepath, self->socket_path, NULL };
+ execvp(args[0], (char *const*)args);
+ }
+ perror("execvp");
+ _exit(127);
+ } else { /* parent */
+ self->kms_server_pid = pid;
+ }
+
+ fprintf(stderr, "gsr info: gsr_kms_client_init: waiting for client to connect\n");
+ for(;;) {
+ struct timeval tv;
+ fd_set rfds;
+ FD_ZERO(&rfds);
+ FD_SET(self->socket_fd, &rfds);
+
+ tv.tv_sec = 0;
+ tv.tv_usec = 100 * 1000; // 100 ms
+
+ int select_res = select(1 + self->socket_fd, &rfds, NULL, NULL, &tv);
+ if(select_res > 0) {
+ socklen_t sock_len = 0;
+ self->client_fd = accept(self->socket_fd, (struct sockaddr*)&remote_addr, &sock_len);
+ if(self->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;
+ int wait_result = waitpid(self->kms_server_pid, &status, WNOHANG);
+ if(wait_result != 0) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: kms server died or never started, error: %s\n", strerror(errno));
+ goto err;
+ }
+ }
+ }
+ fprintf(stderr, "gsr info: gsr_kms_client_init: client connected\n");
+
+ return 0;
+
+ err:
+ gsr_kms_client_deinit(self);
+ return -1;
+}
+
+void gsr_kms_client_deinit(gsr_kms_client *self) {
+ if(self->card_path) {
+ free(self->card_path);
+ self->card_path = NULL;
+ }
+
+ if(self->client_fd != -1) {
+ close(self->client_fd);
+ self->client_fd = -1;
+ }
+
+ if(self->socket_fd != -1) {
+ close(self->socket_fd);
+ self->socket_fd = -1;
+ }
+
+ if(self->kms_server_pid != -1) {
+ kill(self->kms_server_pid, SIGINT);
+ int status;
+ waitpid(self->kms_server_pid, &status, 0);
+ self->kms_server_pid = -1;
+ }
+
+ if(self->socket_path[0] != '\0') {
+ remove(self->socket_path);
+ self->socket_path[0] = '\0';
+ }
+}
+
+int gsr_kms_client_get_kms(gsr_kms_client *self, gsr_kms_response *response) {
+ response->result = KMS_RESULT_FAILED_TO_SEND;
+ strcpy(response->data.err_msg, "failed to send");
+
+ gsr_kms_request request;
+ request.type = KMS_REQUEST_TYPE_GET_KMS;
+ strcpy(request.data.card_path, self->card_path);
+ if(send_msg_to_server(self->client_fd, &request) == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_get_kms: failed to send request message to server\n");
+ return -1;
+ }
+
+ const int recv_res = recv_msg_from_server(self->client_fd, response);
+ if(recv_res == 0) {
+ fprintf(stderr, "gsr warning: gsr_kms_client_get_kms: kms server shut down\n");
+ return -1;
+ } else if(recv_res == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_get_kms: failed to receive response\n");
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/kms/client/kms_client.h b/kms/client/kms_client.h
new file mode 100644
index 0000000..59d3cb3
--- /dev/null
+++ b/kms/client/kms_client.h
@@ -0,0 +1,21 @@
+#ifndef GSR_KMS_CLIENT_H
+#define GSR_KMS_CLIENT_H
+
+#include "../kms_shared.h"
+#include <sys/types.h>
+
+typedef struct {
+ pid_t kms_server_pid;
+ int socket_fd;
+ int client_fd;
+ char socket_path[27];
+ char *card_path;
+} gsr_kms_client;
+
+/* |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, const char *program_dir);
+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 */
diff --git a/kms/kms_shared.h b/kms/kms_shared.h
new file mode 100644
index 0000000..f63c2f3
--- /dev/null
+++ b/kms/kms_shared.h
@@ -0,0 +1,45 @@
+#ifndef GSR_KMS_SHARED_H
+#define GSR_KMS_SHARED_H
+
+#include <stdint.h>
+
+typedef enum {
+ KMS_REQUEST_TYPE_GET_KMS
+} gsr_kms_request_type;
+
+typedef enum {
+ KMS_RESULT_OK,
+ KMS_RESULT_INVALID_REQUEST,
+ KMS_RESULT_FAILED_TO_OPEN_CARD,
+ KMS_RESULT_INSUFFICIENT_PERMISSIONS,
+ KMS_RESULT_FAILED_TO_GET_KMS,
+ KMS_RESULT_NO_KMS_AVAILABLE,
+ KMS_RESULT_FAILED_TO_SEND
+} gsr_kms_result;
+
+typedef struct {
+ int type; /* gsr_kms_request_type */
+ union {
+ char card_path[255];
+ } data;
+} gsr_kms_request;
+
+typedef struct {
+ int fd;
+ uint32_t width;
+ uint32_t height;
+ uint32_t pitch;
+ uint32_t offset;
+ uint32_t pixel_format;
+ uint64_t modifier;
+} gsr_kms_response_fd;
+
+typedef struct {
+ int result; /* gsr_kms_result */
+ union {
+ char err_msg[128];
+ gsr_kms_response_fd fd;
+ } data;
+} gsr_kms_response;
+
+#endif /* #define GSR_KMS_SHARED_H */
diff --git a/kms/server/.gitignore b/kms/server/.gitignore
new file mode 100644
index 0000000..97420ef
--- /dev/null
+++ b/kms/server/.gitignore
@@ -0,0 +1 @@
+sibs-build/
diff --git a/kms/server/kms_server.c b/kms/server/kms_server.c
new file mode 100644
index 0000000..73cf9d0
--- /dev/null
+++ b/kms/server/kms_server.c
@@ -0,0 +1,244 @@
+#include "../kms_shared.h"
+
+#include <asm-generic/socket.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+#define DRM_CLIENT_CAP_UNIVERSAL_PLANES 2
+
+static int max_int(int a, int b) {
+ return a > b ? a : b;
+}
+
+static int send_msg_to_client(int client_fd, gsr_kms_response *response, int *fds, int num_fds) {
+ 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)) * max_int(1, num_fds)];
+ memset(cmsgbuf, 0, sizeof(cmsgbuf));
+
+ if(num_fds > 0) {
+ response_message.msg_control = cmsgbuf;
+ response_message.msg_controllen = sizeof(cmsgbuf);
+
+ int total_msg_len = 0;
+ struct cmsghdr *cmsg = NULL;
+ for(int i = 0; i < num_fds; ++i) {
+ if(i == 0)
+ cmsg = CMSG_FIRSTHDR(&response_message);
+ else
+ cmsg = CMSG_NXTHDR(&response_message, cmsg);
+
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ memcpy(CMSG_DATA(cmsg), &fds[i], sizeof(int));
+ total_msg_len += cmsg->cmsg_len;
+ }
+
+ response_message.msg_controllen = total_msg_len;
+ }
+
+ return sendmsg(client_fd, &response_message, 0);
+}
+
+static int get_kms(const char *card_path, gsr_kms_response *response) {
+ response->result = KMS_RESULT_OK;
+ response->data.fd.fd = 0;
+ response->data.fd.width = 0;
+ response->data.fd.height = 0;
+
+ const int drmfd = open(card_path, O_RDONLY);
+ if (drmfd < 0) {
+ response->result = KMS_RESULT_FAILED_TO_OPEN_CARD;
+ snprintf(response->data.err_msg, sizeof(response->data.err_msg), "failed to open %s, error: %s", card_path, strerror(errno));
+ return -1;
+ }
+
+ if (0 != drmSetClientCap(drmfd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1)) {
+ response->result = KMS_RESULT_INSUFFICIENT_PERMISSIONS;
+ snprintf(response->data.err_msg, sizeof(response->data.err_msg), "drmSetClientCap failed, error: %s", strerror(errno));
+ close(drmfd);
+ return -1;
+ }
+
+ drmModePlaneResPtr planes = drmModeGetPlaneResources(drmfd);
+ if (!planes) {
+ response->result = KMS_RESULT_FAILED_TO_GET_KMS;
+ snprintf(response->data.err_msg, sizeof(response->data.err_msg), "failed to access planes, error: %s", strerror(errno));
+ close(drmfd);
+ return -1;
+ }
+
+ fprintf(stderr, "DRM planes %d:\n", planes->count_planes);
+ for (uint32_t i = 0; i < planes->count_planes; ++i) {
+ drmModePlanePtr plane = drmModeGetPlane(drmfd, planes->planes[i]);
+ if (!plane) {
+ fprintf(stderr, "Cannot get drmModePlanePtr for plane %#x: %s (%d)\n", planes->planes[i], strerror(errno), errno);
+ continue;
+ }
+
+ fprintf(stderr, "\t%d: fb_id=%#x\n", i, plane->fb_id);
+
+ if (!plane->fb_id)
+ goto plane_continue;
+
+ drmModeFB2Ptr drmfb = drmModeGetFB2(drmfd, plane->fb_id);
+ if (!drmfb) {
+ fprintf(stderr, "Cannot get drmModeFBPtr for fb %#x: %s (%d)\n", plane->fb_id, strerror(errno), errno);
+ } else {
+ if (!drmfb->handles[0]) {
+ fprintf(stderr, "\t\tFB handle for fb %#x is NULL\n", plane->fb_id);
+ fprintf(stderr, "\t\tPossible reason: not permitted to get FB handles. Do `sudo setcap cap_sys_admin+ep`\n");
+ } else {
+ int fb_fd = -1;
+ const int ret = drmPrimeHandleToFD(drmfd, drmfb->handles[0], 0, &fb_fd);
+ if (ret != 0 || fb_fd == -1) {
+ fprintf(stderr, "Cannot get fd for fb %#x handle %#x: %s (%d)\n", plane->fb_id, drmfb->handles[0], strerror(errno), errno);
+ } else if(drmfb->width * drmfb->height > response->data.fd.width * response->data.fd.height) {
+ if(response->data.fd.fd != 0) {
+ close(response->data.fd.fd);
+ response->data.fd.fd = 0;
+ }
+
+ response->data.fd.fd = fb_fd;
+ response->data.fd.width = drmfb->width;
+ response->data.fd.height = drmfb->height;
+ response->data.fd.pitch = drmfb->pitches[0];
+ response->data.fd.offset = drmfb->offsets[0];
+ response->data.fd.pixel_format = drmfb->pixel_format;
+ response->data.fd.modifier = drmfb->modifier;
+ fprintf(stderr, "kms width: %u, height: %u, pixel format: %u, modifier: %lu\n", response->data.fd.width, response->data.fd.height, response->data.fd.pixel_format, response->data.fd.modifier);
+ } else {
+ close(fb_fd);
+ }
+ }
+ drmModeFreeFB2(drmfb);
+ }
+
+ plane_continue:
+ drmModeFreePlane(plane);
+ }
+
+ drmModeFreePlaneResources(planes);
+ close(drmfd);
+
+ if(response->data.fd.fd == 0) {
+ response->result = KMS_RESULT_NO_KMS_AVAILABLE;
+ snprintf(response->data.err_msg, sizeof(response->data.err_msg), "no kms found");
+ return -1;
+ }
+
+ return 0;
+}
+
+int main(int argc, char **argv) {
+ if(argc != 2) {
+ fprintf(stderr, "usage: kms_server <domain_socket_path>\n");
+ return 1;
+ }
+
+ const char *domain_socket_path = argv[1];
+ int socket_fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if(socket_fd == -1) {
+ fprintf(stderr, "kms server error: failed to create socket, error: %s\n", strerror(errno));
+ return 2;
+ }
+
+ fprintf(stderr, "kms server info: connecting to the server\n");
+ for(;;) {
+ struct sockaddr_un remote_addr = {0};
+ remote_addr.sun_family = AF_UNIX;
+ strncpy(remote_addr.sun_path, domain_socket_path, sizeof(remote_addr.sun_path));
+ // TODO: Check if parent disconnected
+ if(connect(socket_fd, (struct sockaddr*)&remote_addr, sizeof(remote_addr.sun_family) + strlen(remote_addr.sun_path)) == -1) {
+ if(errno == ECONNREFUSED || errno == ENOENT)
+ continue; // Host not ready yet? TODO: sleep
+ if(errno == EISCONN) // TODO?
+ break;
+ fprintf(stderr, "kms server error: connect failed, error: %s (%d)\n", strerror(errno), errno);
+ return 2;
+ }
+ }
+ fprintf(stderr, "kms server info: connected to the server\n");
+
+ int res = 0;
+ for(;;) {
+ gsr_kms_request request;
+ struct iovec iov;
+ iov.iov_base = &request;
+ iov.iov_len = sizeof(request);
+
+ struct msghdr request_message = {0};
+ request_message.msg_iov = &iov;
+ request_message.msg_iovlen = 1;
+ const int recv_res = recvmsg(socket_fd, &request_message, MSG_WAITALL);
+ if(recv_res == 0) {
+ fprintf(stderr, "kms server info: kms client shutdown, shutting down the server\n");
+ res = 3;
+ goto done;
+ } else if(recv_res == -1) {
+ const int err = errno;
+ fprintf(stderr, "kms server error: failed to read all data in client request (error: %s), ignoring\n", strerror(err));
+ if(err == EBADF) {
+ fprintf(stderr, "kms server error: invalid client fd, shutting down the server\n");
+ res = 3;
+ goto done;
+ }
+ continue;
+ }
+ request.data.card_path[254] = '\0';
+
+ switch(request.type) {
+ case KMS_REQUEST_TYPE_GET_KMS: {
+ gsr_kms_response response;
+ int kms_fd = 0;
+ if (get_kms(request.data.card_path, &response) == 0) {
+ kms_fd = response.data.fd.fd;
+ }
+
+ if(send_msg_to_client(socket_fd, &response, &kms_fd, kms_fd == 0 ? 0 : 1) == -1) {
+ fprintf(stderr, "kms server error: failed to respond to client KMS_REQUEST_TYPE_GET_KMS request\n");
+ if(kms_fd != 0)
+ close(kms_fd);
+ break;
+ }
+
+ if(kms_fd != 0)
+ close(kms_fd);
+
+ break;
+ }
+ default: {
+ gsr_kms_response response;
+ response.result = KMS_RESULT_INVALID_REQUEST;
+ snprintf(response.data.err_msg, sizeof(response.data.err_msg), "invalid request type %d, expected %d (%s)", request.type, KMS_REQUEST_TYPE_GET_KMS, "KMS_REQUEST_TYPE_GET_KMS");
+ fprintf(stderr, "%s\n", response.data.err_msg);
+ if(send_msg_to_client(socket_fd, &response, NULL, 0) == -1) {
+ fprintf(stderr, "kms server error: failed to respond to client request\n");
+ break;
+ }
+ break;
+ }
+ }
+ }
+
+ done:
+ close(socket_fd);
+ return res;
+}
diff --git a/kms/server/project.conf b/kms/server/project.conf
new file mode 100644
index 0000000..cf863c1
--- /dev/null
+++ b/kms/server/project.conf
@@ -0,0 +1,8 @@
+[package]
+name = "gsr-kms-server"
+type = "executable"
+version = "1.0.0"
+platforms = ["posix"]
+
+[dependencies]
+libdrm = ">=2"
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 16:47:06 +0000