diff options
Diffstat (limited to 'src/kms/kms_server.c')
| -rw-r--r-- | src/kms/kms_server.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/src/kms/kms_server.c b/src/kms/kms_server.c new file mode 100644 index 0000000..f811050 --- /dev/null +++ b/src/kms/kms_server.c @@ -0,0 +1,242 @@ +#include "../../include/kms/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)); + 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)); + 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); // TODO? + + 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; +} |