aboutsummaryrefslogtreecommitdiff
path: root/kms/server/kms_server.c
diff options
context:
space:
mode:
Diffstat (limited to 'kms/server/kms_server.c')
-rw-r--r--kms/server/kms_server.c215
1 files changed, 36 insertions, 179 deletions
diff --git a/kms/server/kms_server.c b/kms/server/kms_server.c
index b4f3378..b844526 100644
--- a/kms/server/kms_server.c
+++ b/kms/server/kms_server.c
@@ -6,25 +6,24 @@
#include <stdio.h>
#include <string.h>
-#include <errno.h>
#include <stdlib.h>
+#include <errno.h>
+#include <locale.h>
#include <unistd.h>
#include <limits.h>
#include <fcntl.h>
#include <sys/socket.h>
-#include <sys/un.h>
-#include <time.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <drm_mode.h>
+#include <drm_fourcc.h>
#define MAX_CONNECTORS 32
typedef struct {
int drmfd;
- drmModePlaneResPtr planes;
} gsr_drm;
typedef struct {
@@ -207,7 +206,7 @@ static uint32_t plane_get_properties(int drmfd, uint32_t plane_id, int *x, int *
return property_mask;
}
-/* Returns 0 if not found */
+/* Returns NULL if not found */
static const connector_crtc_pair* get_connector_pair_by_crtc_id(const connector_to_crtc_map *c2crtc_map, uint32_t crtc_id) {
for(int i = 0; i < c2crtc_map->num_maps; ++i) {
if(c2crtc_map->maps[i].crtc_id == crtc_id)
@@ -288,21 +287,31 @@ static int drm_prime_handles_to_fds(gsr_drm *drm, drmModeFB2Ptr drmfb, int *fb_f
return GSR_KMS_MAX_DMA_BUFS;
}
-static int kms_get_fb(gsr_drm *drm, gsr_kms_response *response, connector_to_crtc_map *c2crtc_map) {
+static int kms_get_fb(gsr_drm *drm, gsr_kms_response *response) {
int result = -1;
response->result = KMS_RESULT_OK;
response->err_msg[0] = '\0';
response->num_items = 0;
- for(uint32_t i = 0; i < drm->planes->count_planes && response->num_items < GSR_KMS_MAX_ITEMS; ++i) {
+ connector_to_crtc_map c2crtc_map;
+ c2crtc_map.num_maps = 0;
+ map_crtc_to_connector_ids(drm, &c2crtc_map);
+
+ drmModePlaneResPtr planes = drmModeGetPlaneResources(drm->drmfd);
+ if(!planes) {
+ fprintf(stderr, "kms server error: failed to get plane resources, error: %s\n", strerror(errno));
+ goto done;
+ }
+
+ for(uint32_t i = 0; i < planes->count_planes && response->num_items < GSR_KMS_MAX_ITEMS; ++i) {
drmModePlanePtr plane = NULL;
drmModeFB2Ptr drmfb = NULL;
- plane = drmModeGetPlane(drm->drmfd, drm->planes->planes[i]);
+ plane = drmModeGetPlane(drm->drmfd, planes->planes[i]);
if(!plane) {
response->result = KMS_RESULT_FAILED_TO_GET_PLANE;
- snprintf(response->err_msg, sizeof(response->err_msg), "failed to get drm plane with id %u, error: %s\n", drm->planes->planes[i], strerror(errno));
+ snprintf(response->err_msg, sizeof(response->err_msg), "failed to get drm plane with id %u, error: %s\n", planes->planes[i], strerror(errno));
fprintf(stderr, "kms server error: %s\n", response->err_msg);
goto next;
}
@@ -345,7 +354,7 @@ static int kms_get_fb(gsr_drm *drm, gsr_kms_response *response, connector_to_crt
const int item_index = response->num_items;
- const connector_crtc_pair *crtc_pair = get_connector_pair_by_crtc_id(c2crtc_map, plane->crtc_id);
+ const connector_crtc_pair *crtc_pair = get_connector_pair_by_crtc_id(&c2crtc_map, plane->crtc_id);
if(crtc_pair && crtc_pair->hdr_metadata_blob_id) {
response->items[item_index].has_hdr_metadata = get_hdr_metadata(drm->drmfd, crtc_pair->hdr_metadata_blob_id, &response->items[item_index].hdr_metadata);
} else {
@@ -362,7 +371,7 @@ static int kms_get_fb(gsr_drm *drm, gsr_kms_response *response, connector_to_crt
response->items[item_index].width = drmfb->width;
response->items[item_index].height = drmfb->height;
response->items[item_index].pixel_format = drmfb->pixel_format;
- response->items[item_index].modifier = drmfb->modifier;
+ response->items[item_index].modifier = drmfb->flags & DRM_MODE_FB_MODIFIERS ? drmfb->modifier : DRM_FORMAT_MOD_INVALID;
response->items[item_index].connector_id = crtc_pair ? crtc_pair->connector_id : 0;
response->items[item_index].is_cursor = property_mask & PLANE_PROPERTY_IS_CURSOR;
if(property_mask & PLANE_PROPERTY_IS_CURSOR) {
@@ -388,6 +397,11 @@ static int kms_get_fb(gsr_drm *drm, gsr_kms_response *response, connector_to_crt
drmModeFreePlane(plane);
}
+ done:
+
+ if(planes)
+ drmModeFreePlaneResources(planes);
+
if(response->num_items > 0)
response->result = KMS_RESULT_OK;
@@ -410,110 +424,28 @@ static int kms_get_fb(gsr_drm *drm, gsr_kms_response *response, connector_to_crt
return result;
}
-static double clock_get_monotonic_seconds(void) {
- struct timespec ts;
- ts.tv_sec = 0;
- ts.tv_nsec = 0;
- clock_gettime(CLOCK_MONOTONIC, &ts);
- return (double)ts.tv_sec + (double)ts.tv_nsec * 0.000000001;
-}
-
-// 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;
-// }
-
-// static void file_get_directory(char *filepath) {
-// char *end = strrchr(filepath, '/');
-// if(end == NULL)
-// filepath[0] = '\0';
-// else
-// *end = '\0';
-// }
-
-// static bool string_ends_with(const char *str, const char *ends_with) {
-// const int len = strlen(str);
-// const int ends_with_len = strlen(ends_with);
-// return len >= ends_with_len && memcmp(str + len - ends_with_len, ends_with, ends_with_len) == 0;
-// }
-
-// This is not foolproof, but the assumption is that gsr-kms-server and gpu-screen-recorder are installed in the same directory
-// in a location that only the root user can write to (usually /usr/bin or /usr/local/bin) and if the client runs from that location
-// and is called gpu-screen-recorder then gsr-kms-server can only be used by a malicious program if the malicious program
-// had root access, to modify that program install directory.
-// static bool is_remote_peer_program_gpu_screen_recorder(int socket_fd) {
-// // TODO: Use SO_PEERPIDFD on kernel >= 6.5 to avoid a race condition in the /proc/<pid> check
-// struct ucred cred;
-// socklen_t ucred_len = sizeof(cred);
-// if(getsockopt(socket_fd, SOL_SOCKET, SO_PEERCRED, &cred, &ucred_len) == -1) {
-// fprintf(stderr, "kms server error: failed to get peer credentials, error: %s\n", strerror(errno));
-// return false;
-// }
-
-// char self_directory[PATH_MAX];
-// if(!readlink_realpath("/proc/self/exe", self_directory)) {
-// fprintf(stderr, "kms server error: failed to resolve /proc/self/exe\n");
-// return false;
-// }
-// file_get_directory(self_directory);
-
-// char peer_directory[PATH_MAX];
-// char peer_exe_path[PATH_MAX];
-// snprintf(peer_exe_path, sizeof(peer_exe_path), "/proc/%d/exe", (int)cred.pid);
-// if(!readlink_realpath(peer_exe_path, peer_directory)) {
-// fprintf(stderr, "kms server error: failed to resolve /proc/self/exe\n");
-// return false;
-// }
-
-// if(!string_ends_with(peer_directory, "/gpu-screen-recorder")) {
-// fprintf(stderr, "kms server error: only gpu-screen-recorder can use gsr-kms-server. client program location is %s\n", peer_directory);
-// return false;
-// }
-
-// file_get_directory(peer_directory);
-
-// if(strcmp(self_directory, peer_directory) != 0) {
-// fprintf(stderr, "kms server error: the client program is in directory %s but only programs in %s can run gsr-kms-server\n", peer_directory, self_directory);
-// return false;
-// }
-
-// return true;
-// }
-
int main(int argc, char **argv) {
+ setlocale(LC_ALL, "C"); // Sigh... stupid C
+
int res = 0;
int socket_fd = 0;
gsr_drm drm;
drm.drmfd = 0;
- drm.planes = NULL;
if(argc != 3) {
- fprintf(stderr, "usage: gsr-kms-server <domain_socket_path> <card_path>\n");
+ fprintf(stderr, "usage: gsr-kms-server <socket_fd> <card_path>\n");
return 1;
}
- const char *domain_socket_path = argv[1];
- 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;
- }
-
+ const char *socket_fd_str = argv[1];
const char *card_path = argv[2];
+ socket_fd = atoi(socket_fd_str);
+ if(socket_fd <= 0) {
+ fprintf(stderr, "kms server error: received invalid socket fd for argument 1, expected a number got \"%s\"\n", socket_fd_str);
+ return 1;
+ }
+
drm.drmfd = open(card_path, O_RDONLY);
if(drm.drmfd < 0) {
fprintf(stderr, "kms server error: failed to open %s, error: %s", card_path, strerror(errno));
@@ -531,56 +463,6 @@ int main(int argc, char **argv) {
fprintf(stderr, "kms server warning: drmSetClientCap DRM_CLIENT_CAP_ATOMIC failed, error: %s. The wrong monitor may be captured as a result\n", strerror(errno));
}
- drm.planes = drmModeGetPlaneResources(drm.drmfd);
- if(!drm.planes) {
- fprintf(stderr, "kms server error: failed to get plane resources, error: %s\n", strerror(errno));
- res = 2;
- goto done;
- }
-
- connector_to_crtc_map c2crtc_map;
- c2crtc_map.num_maps = 0;
- map_crtc_to_connector_ids(&drm, &c2crtc_map);
-
- fprintf(stderr, "kms server info: connecting to the client\n");
- bool connected = false;
- const double connect_timeout_sec = 5.0;
- const double start_time = clock_get_monotonic_seconds();
- while(clock_get_monotonic_seconds() - start_time < connect_timeout_sec) {
- struct sockaddr_un remote_addr = {0};
- remote_addr.sun_family = AF_UNIX;
- snprintf(remote_addr.sun_path, sizeof(remote_addr.sun_path), "%s", domain_socket_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) {
- goto next;
- } else if(errno == EISCONN) {
- connected = true;
- break;
- }
-
- fprintf(stderr, "kms server error: connect failed, error: %s (%d)\n", strerror(errno), errno);
- res = 2;
- goto done;
- }
-
- next:
- usleep(30 * 1000); // 30 milliseconds
- }
-
- if(connected) {
- fprintf(stderr, "kms server info: connected to the client\n");
- } else {
- fprintf(stderr, "kms server error: failed to connect to the client in %f seconds\n", connect_timeout_sec);
- res = 2;
- goto done;
- }
-
- // if(!is_remote_peer_program_gpu_screen_recorder(socket_fd)) {
- // res = 3;
- // goto done;
- // }
-
for(;;) {
gsr_kms_request request;
request.version = 0;
@@ -613,35 +495,12 @@ int main(int argc, char **argv) {
}
switch(request.type) {
- case KMS_REQUEST_TYPE_REPLACE_CONNECTION: {
- gsr_kms_response response;
- response.version = GSR_KMS_PROTOCOL_VERSION;
- response.num_items = 0;
-
- if(request.new_connection_fd > 0) {
- if(socket_fd > 0)
- close(socket_fd);
- socket_fd = request.new_connection_fd;
-
- response.result = KMS_RESULT_OK;
- if(send_msg_to_client(socket_fd, &response) == -1)
- fprintf(stderr, "kms server error: failed to respond to client KMS_REQUEST_TYPE_REPLACE_CONNECTION request\n");
- } else {
- response.result = KMS_RESULT_INVALID_REQUEST;
- snprintf(response.err_msg, sizeof(response.err_msg), "received invalid connection fd");
- fprintf(stderr, "kms server error: %s\n", response.err_msg);
- if(send_msg_to_client(socket_fd, &response) == -1)
- fprintf(stderr, "kms server error: failed to respond to client request\n");
- }
-
- break;
- }
case KMS_REQUEST_TYPE_GET_KMS: {
gsr_kms_response response;
response.version = GSR_KMS_PROTOCOL_VERSION;
response.num_items = 0;
- if(kms_get_fb(&drm, &response, &c2crtc_map) == 0) {
+ if(kms_get_fb(&drm, &response) == 0) {
if(send_msg_to_client(socket_fd, &response) == -1)
fprintf(stderr, "kms server error: failed to respond to client KMS_REQUEST_TYPE_GET_KMS request\n");
} else {
@@ -680,8 +539,6 @@ int main(int argc, char **argv) {
}
done:
- if(drm.planes)
- drmModeFreePlaneResources(drm.planes);
if(drm.drmfd > 0)
close(drm.drmfd);
if(socket_fd > 0)
generated by cgit v1.2.3-70-g09d2 (git 2.48.1) at 2025-07-06 15:55:14 +0000