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-rw-r--r--common/connection.c312
-rw-r--r--common/drm.c23
-rw-r--r--common/evdev.c15
-rw-r--r--common/list.c76
-rw-r--r--common/log.c80
-rw-r--r--common/terminal.c202
6 files changed, 708 insertions, 0 deletions
diff --git a/common/connection.c b/common/connection.c
new file mode 100644
index 0000000..2545e5d
--- /dev/null
+++ b/common/connection.c
@@ -0,0 +1,312 @@
+#include <errno.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include "compiler.h"
+#include "connection.h"
+
+#define CLEN (CMSG_LEN(MAX_FDS_OUT * sizeof(int)))
+
+ALWAYS_INLINE static uint32_t connection_buffer_mask(const uint32_t idx) {
+ return idx & (CONNECTION_BUFFER_SIZE - 1);
+}
+
+ALWAYS_INLINE static uint32_t connection_buffer_size(const struct connection_buffer *b) {
+ return b->head - b->tail;
+}
+
+ALWAYS_INLINE static void connection_buffer_consume(struct connection_buffer *b, const size_t size) {
+ b->tail += size;
+}
+
+ALWAYS_INLINE static void connection_buffer_restore(struct connection_buffer *b, const size_t size) {
+ b->tail -= size;
+}
+
+/*
+ * connection_buffer_get_iov prepares I/O vectors pointing to our ring buffer.
+ * Two may be used if the buffer has wrapped around.
+ */
+static void connection_buffer_get_iov(struct connection_buffer *b, struct iovec *iov, int *count) {
+ uint32_t head = connection_buffer_mask(b->head);
+ uint32_t tail = connection_buffer_mask(b->tail);
+ if (tail < head) {
+ iov[0].iov_base = b->data + tail;
+ iov[0].iov_len = head - tail;
+ *count = 1;
+ } else if (head == 0) {
+ iov[0].iov_base = b->data + tail;
+ iov[0].iov_len = sizeof b->data - tail;
+ *count = 1;
+ } else {
+ iov[0].iov_base = b->data + tail;
+ iov[0].iov_len = sizeof b->data - tail;
+ iov[1].iov_base = b->data;
+ iov[1].iov_len = head;
+ *count = 2;
+ }
+}
+
+/*
+ * connection_buffer_put_iov prepares I/O vectors pointing to our ring buffer.
+ * Two may be used if the buffer has wrapped around.
+ */
+static void connection_buffer_put_iov(struct connection_buffer *b, struct iovec *iov, int *count) {
+ uint32_t head = connection_buffer_mask(b->head);
+ uint32_t tail = connection_buffer_mask(b->tail);
+ if (head < tail) {
+ iov[0].iov_base = b->data + head;
+ iov[0].iov_len = tail - head;
+ *count = 1;
+ } else if (tail == 0) {
+ iov[0].iov_base = b->data + head;
+ iov[0].iov_len = sizeof b->data - head;
+ *count = 1;
+ } else {
+ iov[0].iov_base = b->data + head;
+ iov[0].iov_len = sizeof b->data - head;
+ iov[1].iov_base = b->data;
+ iov[1].iov_len = tail;
+ *count = 2;
+ }
+}
+
+/*
+ * connection_buffer_copy copies from our ring buffer into a linear buffer.
+ */
+static void connection_buffer_copy(const struct connection_buffer *b, void *data, const size_t count) {
+ uint32_t tail = connection_buffer_mask(b->tail);
+ if (tail + count <= sizeof b->data) {
+ memcpy(data, b->data + tail, count);
+ return;
+ }
+
+ uint32_t size = sizeof b->data - tail;
+ memcpy(data, b->data + tail, size);
+ memcpy((char *)data + size, b->data, count - size);
+}
+/*
+ * connection_buffer_copy copies from a linear buffer into our ring buffer.
+ */
+static int connection_buffer_put(struct connection_buffer *b, const void *data, const size_t count) {
+ if (count > sizeof(b->data)) {
+ errno = EOVERFLOW;
+ return -1;
+ }
+
+ uint32_t head = connection_buffer_mask(b->head);
+ if (head + count <= sizeof b->data) {
+ memcpy(b->data + head, data, count);
+ } else {
+ uint32_t size = sizeof b->data - head;
+ memcpy(b->data + head, data, size);
+ memcpy(b->data, (const char *)data + size, count - size);
+ }
+
+ b->head += count;
+ return 0;
+}
+
+/*
+ * close_fds closes all fds within a connection_buffer
+ */
+static void connection_buffer_close_fds(struct connection_buffer *buffer) {
+ size_t size = connection_buffer_size(buffer);
+ if (size == 0) {
+ return;
+ }
+ int fds[sizeof(buffer->data) / sizeof(int)];
+ connection_buffer_copy(buffer, fds, size);
+ int count = size / sizeof fds[0];
+ size = count * sizeof fds[0];
+ for (int idx = 0; idx < count; idx++) {
+ close(fds[idx]);
+ }
+ connection_buffer_consume(buffer, size);
+}
+
+/*
+ * build_cmsg prepares a cmsg from a buffer full of fds
+ */
+static void build_cmsg(struct connection_buffer *buffer, char *data, int *clen) {
+ size_t size = connection_buffer_size(buffer);
+ if (size > MAX_FDS_OUT * sizeof(int)) {
+ size = MAX_FDS_OUT * sizeof(int);
+ }
+
+ if (size <= 0) {
+ *clen = 0;
+ return;
+ }
+
+ struct cmsghdr *cmsg = (struct cmsghdr *)data;
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(size);
+ connection_buffer_copy(buffer, CMSG_DATA(cmsg), size);
+ *clen = cmsg->cmsg_len;
+}
+
+static int decode_cmsg(struct connection_buffer *buffer, struct msghdr *msg) {
+ bool overflow = false;
+ struct cmsghdr *cmsg;
+ for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) {
+ if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
+ continue;
+ }
+
+ size_t size = cmsg->cmsg_len - CMSG_LEN(0);
+ size_t max = sizeof(buffer->data) - connection_buffer_size(buffer);
+ if (size > max || overflow) {
+ overflow = true;
+ size /= sizeof(int);
+ for (size_t idx = 0; idx < size; idx++) {
+ close(((int *)CMSG_DATA(cmsg))[idx]);
+ }
+ } else if (connection_buffer_put(buffer, CMSG_DATA(cmsg), size) < 0) {
+ return -1;
+ }
+ }
+
+ if (overflow) {
+ errno = EOVERFLOW;
+ return -1;
+ }
+ return 0;
+}
+
+int connection_read(struct connection *connection) {
+ if (connection_buffer_size(&connection->in) >= sizeof(connection->in.data)) {
+ errno = EOVERFLOW;
+ return -1;
+ }
+
+ int count;
+ struct iovec iov[2];
+ connection_buffer_put_iov(&connection->in, iov, &count);
+
+ char cmsg[CLEN];
+ struct msghdr msg = {
+ .msg_name = NULL,
+ .msg_namelen = 0,
+ .msg_iov = iov,
+ .msg_iovlen = count,
+ .msg_control = cmsg,
+ .msg_controllen = sizeof cmsg,
+ .msg_flags = 0,
+ };
+
+ int len;
+ do {
+ len = recvmsg(connection->fd, &msg, MSG_DONTWAIT | MSG_CMSG_CLOEXEC);
+ if (len == -1 && errno != EINTR)
+ return -1;
+ } while (len == -1);
+
+ if (decode_cmsg(&connection->fds_in, &msg) != 0) {
+ return -1;
+ }
+ connection->in.head += len;
+
+ return connection_buffer_size(&connection->in);
+}
+
+int connection_flush(struct connection *connection) {
+ if (!connection->want_flush) {
+ return 0;
+ }
+
+ uint32_t tail = connection->out.tail;
+ while (connection->out.head - connection->out.tail > 0) {
+ int count;
+ struct iovec iov[2];
+ connection_buffer_get_iov(&connection->out, iov, &count);
+
+ int clen;
+ char cmsg[CLEN];
+ build_cmsg(&connection->fds_out, cmsg, &clen);
+ struct msghdr msg = {
+ .msg_name = NULL,
+ .msg_namelen = 0,
+ .msg_iov = iov,
+ .msg_iovlen = count,
+ .msg_control = (clen > 0) ? cmsg : NULL,
+ .msg_controllen = clen,
+ .msg_flags = 0,
+ };
+
+ int len;
+ do {
+ len = sendmsg(connection->fd, &msg, MSG_NOSIGNAL | MSG_DONTWAIT);
+ if (len == -1 && errno != EINTR)
+ return -1;
+ } while (len == -1);
+ connection_buffer_close_fds(&connection->fds_out);
+ connection->out.tail += len;
+ }
+ connection->want_flush = 0;
+ return connection->out.head - tail;
+}
+
+int connection_put(struct connection *connection, const void *data, size_t count) {
+ if (connection_buffer_size(&connection->out) + count > CONNECTION_BUFFER_SIZE) {
+ connection->want_flush = 1;
+ if (connection_flush(connection) == -1) {
+ return -1;
+ }
+ }
+
+ if (connection_buffer_put(&connection->out, data, count) == -1) {
+ return -1;
+ }
+
+ connection->want_flush = 1;
+ return 0;
+}
+
+int connection_put_fd(struct connection *connection, int fd) {
+ if (connection_buffer_size(&connection->fds_out) == MAX_FDS_OUT * sizeof fd) {
+ errno = EOVERFLOW;
+ return -1;
+ }
+
+ return connection_buffer_put(&connection->fds_out, &fd, sizeof fd);
+}
+
+int connection_get(struct connection *connection, void *dst, size_t count) {
+ if (count > connection_buffer_size(&connection->in)) {
+ errno = EAGAIN;
+ return -1;
+ }
+ connection_buffer_copy(&connection->in, dst, count);
+ connection_buffer_consume(&connection->in, count);
+ return count;
+}
+
+int connection_get_fd(struct connection *connection) {
+ int fd;
+ if (sizeof fd > connection_buffer_size(&connection->fds_in)) {
+ errno = EAGAIN;
+ return -1;
+ }
+ connection_buffer_copy(&connection->fds_in, &fd, sizeof fd);
+ connection_buffer_consume(&connection->fds_in, sizeof fd);
+ return fd;
+}
+
+void connection_close_fds(struct connection *connection) {
+ connection_buffer_close_fds(&connection->fds_in);
+ connection_buffer_close_fds(&connection->fds_out);
+}
+
+size_t connection_pending(struct connection *connection) {
+ return connection_buffer_size(&connection->in);
+}
+
+void connection_restore(struct connection *connection, size_t count) {
+ connection_buffer_restore(&connection->in, count);
+}
diff --git a/common/drm.c b/common/drm.c
new file mode 100644
index 0000000..4b70b64
--- /dev/null
+++ b/common/drm.c
@@ -0,0 +1,23 @@
+#include <sys/ioctl.h>
+#include <sys/sysmacros.h>
+#include <sys/types.h>
+
+#include "drm.h"
+
+// From libdrm
+#define DRM_IOCTL_BASE 'd'
+#define DRM_IO(nr) _IO(DRM_IOCTL_BASE, nr)
+#define DRM_IOCTL_SET_MASTER DRM_IO(0x1e)
+#define DRM_IOCTL_DROP_MASTER DRM_IO(0x1f)
+
+int drm_set_master(int fd) {
+ return ioctl(fd, DRM_IOCTL_SET_MASTER, 0);
+}
+
+int drm_drop_master(int fd) {
+ return ioctl(fd, DRM_IOCTL_DROP_MASTER, 0);
+}
+
+int dev_is_drm(dev_t device) {
+ return major(device) == 226;
+}
diff --git a/common/evdev.c b/common/evdev.c
new file mode 100644
index 0000000..fe6922d
--- /dev/null
+++ b/common/evdev.c
@@ -0,0 +1,15 @@
+#include <linux/input.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <sys/sysmacros.h>
+#include <sys/types.h>
+
+#include "evdev.h"
+
+int evdev_revoke(int fd) {
+ return ioctl(fd, EVIOCREVOKE, NULL);
+}
+
+int dev_is_evdev(dev_t device) {
+ return major(device) == 13;
+}
diff --git a/common/list.c b/common/list.c
new file mode 100644
index 0000000..1a86837
--- /dev/null
+++ b/common/list.c
@@ -0,0 +1,76 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "list.h"
+
+void list_init(struct list *list) {
+ list->capacity = 10;
+ list->length = 0;
+ list->items = malloc(sizeof(void *) * list->capacity);
+}
+
+static void list_resize(struct list *list) {
+ if (list->length == list->capacity) {
+ list->capacity *= 2;
+ list->items = realloc(list->items, sizeof(void *) * list->capacity);
+ }
+}
+
+void list_free(struct list *list) {
+ list->capacity = 0;
+ list->length = 0;
+ free(list->items);
+}
+
+void list_add(struct list *list, void *item) {
+ list_resize(list);
+ list->items[list->length++] = item;
+}
+
+void list_insert(struct list *list, size_t index, void *item) {
+ list_resize(list);
+ memmove(&list->items[index + 1], &list->items[index],
+ sizeof(void *) * (list->length - index));
+ list->length++;
+ list->items[index] = item;
+}
+
+void list_del(struct list *list, size_t index) {
+ list->length--;
+ memmove(&list->items[index], &list->items[index + 1],
+ sizeof(void *) * (list->length - index));
+}
+
+size_t list_find(struct list *list, const void *item) {
+ for (size_t i = 0; i < list->length; i++) {
+ if (list->items[i] == item) {
+ return i;
+ }
+ }
+ return -1;
+}
+
+void list_concat(struct list *list, struct list *source) {
+ if (list->length + source->length > list->capacity) {
+ while (list->length + source->length > list->capacity) {
+ list->capacity *= 2;
+ }
+ list->items = realloc(list->items, sizeof(void *) * list->capacity);
+ }
+ memmove(&list->items[list->length], source->items, sizeof(void *) * (source->length));
+ list->length += source->length;
+}
+
+void list_truncate(struct list *list) {
+ list->length = 0;
+}
+
+void *list_pop_front(struct list *list) {
+ if (list->length == 0) {
+ return NULL;
+ }
+ void *item = list->items[0];
+ list_del(list, 0);
+ return item;
+}
diff --git a/common/log.c b/common/log.c
new file mode 100644
index 0000000..1474dcc
--- /dev/null
+++ b/common/log.c
@@ -0,0 +1,80 @@
+#include <errno.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "log.h"
+
+const long NSEC_PER_SEC = 1000000000;
+
+static enum libseat_log_level current_log_level;
+static struct timespec start_time = {-1, -1};
+static bool colored = false;
+
+static const char *verbosity_colors[] = {
+ [LIBSEAT_SILENT] = "",
+ [LIBSEAT_ERROR] = "\x1B[1;31m",
+ [LIBSEAT_INFO] = "\x1B[1;34m",
+ [LIBSEAT_DEBUG] = "\x1B[1;90m",
+};
+
+static const char *verbosity_headers[] = {
+ [LIBSEAT_SILENT] = "",
+ [LIBSEAT_ERROR] = "[ERROR]",
+ [LIBSEAT_INFO] = "[INFO]",
+ [LIBSEAT_DEBUG] = "[DEBUG]",
+};
+
+static void timespec_sub(struct timespec *r, const struct timespec *a, const struct timespec *b) {
+ r->tv_sec = a->tv_sec - b->tv_sec;
+ r->tv_nsec = a->tv_nsec - b->tv_nsec;
+ if (r->tv_nsec < 0) {
+ r->tv_sec--;
+ r->tv_nsec += NSEC_PER_SEC;
+ }
+}
+
+void libseat_log_init(enum libseat_log_level level) {
+ if (start_time.tv_sec >= 0) {
+ return;
+ }
+ clock_gettime(CLOCK_MONOTONIC, &start_time);
+ current_log_level = level;
+ colored = isatty(STDERR_FILENO);
+}
+
+void _libseat_logf(enum libseat_log_level level, const char *fmt, ...) {
+ int stored_errno = errno;
+ va_list args;
+ if (level < current_log_level) {
+ return;
+ }
+
+ struct timespec ts = {0};
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+ timespec_sub(&ts, &ts, &start_time);
+ unsigned c = (level < LIBSEAT_LOG_LEVEL_LAST) ? level : LIBSEAT_LOG_LEVEL_LAST - 1;
+
+ const char *prefix, *postfix;
+
+ if (colored) {
+ prefix = verbosity_colors[c];
+ postfix = "\x1B[0m\n";
+ } else {
+ prefix = verbosity_headers[c];
+ postfix = "\n";
+ }
+
+ fprintf(stderr, "%02d:%02d:%02d.%03ld %s ", (int)(ts.tv_sec / 60 / 60),
+ (int)(ts.tv_sec / 60 % 60), (int)(ts.tv_sec % 60), ts.tv_nsec / 1000000, prefix);
+
+ va_start(args, fmt);
+ vfprintf(stderr, fmt, args);
+ va_end(args);
+
+ fprintf(stderr, "%s", postfix);
+ errno = stored_errno;
+}
diff --git a/common/terminal.c b/common/terminal.c
new file mode 100644
index 0000000..c9ee758
--- /dev/null
+++ b/common/terminal.c
@@ -0,0 +1,202 @@
+#include "string.h"
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/kd.h>
+#include <linux/vt.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "log.h"
+#include "terminal.h"
+
+#define TTYPATHLEN 64
+
+int terminal_current_vt(void) {
+ struct vt_stat st;
+ int fd = open("/dev/tty0", O_RDWR | O_NOCTTY);
+ if (fd == -1) {
+ log_errorf("could not open tty0: %s", strerror(errno));
+ return -1;
+ }
+ int res = ioctl(fd, VT_GETSTATE, &st);
+ close(fd);
+ if (res == -1) {
+ log_errorf("could not retrieve VT state: %s", strerror(errno));
+ return -1;
+ }
+ return st.v_active;
+}
+
+int terminal_setup(int vt) {
+ log_debugf("setting up vt %d", vt);
+ if (vt == -1) {
+ vt = 0;
+ }
+ char path[TTYPATHLEN];
+ if (snprintf(path, TTYPATHLEN, "/dev/tty%d", vt) == -1) {
+ log_errorf("could not generate tty path: %s", strerror(errno));
+ return -1;
+ }
+ int fd = open(path, O_RDWR | O_NOCTTY);
+ if (fd == -1) {
+ log_errorf("could not open target tty: %s", strerror(errno));
+ return -1;
+ }
+
+ static struct vt_mode mode = {
+ .mode = VT_PROCESS,
+ .waitv = 0,
+ .relsig = SIGUSR1,
+ .acqsig = SIGUSR2,
+ .frsig = 0,
+ };
+
+ int res = ioctl(fd, VT_SETMODE, &mode);
+ close(fd);
+ if (res == -1) {
+ log_errorf("could not set VT mode: %s", strerror(errno));
+ }
+
+ return res;
+}
+
+int terminal_teardown(int vt) {
+ log_debugf("tearing down vt %d", vt);
+ if (vt == -1) {
+ vt = 0;
+ }
+ char path[TTYPATHLEN];
+ if (snprintf(path, TTYPATHLEN, "/dev/tty%d", vt) == -1) {
+ log_errorf("could not generate tty path: %s", strerror(errno));
+ return -1;
+ }
+ int fd = open(path, O_RDWR | O_NOCTTY);
+ if (fd == -1) {
+ log_errorf("could not open target tty: %s", strerror(errno));
+ return -1;
+ }
+ if (ioctl(fd, KDSETMODE, KD_TEXT) == -1) {
+ log_errorf("could not set KD graphics mode: %s", strerror(errno));
+ close(fd);
+ return -1;
+ }
+ if (ioctl(fd, KDSKBMODE, K_UNICODE) == -1) {
+ log_errorf("could not set KD keyboard mode: %s", strerror(errno));
+ close(fd);
+ return -1;
+ }
+
+ static struct vt_mode mode = {
+ .mode = VT_PROCESS,
+ .waitv = 0,
+ .relsig = SIGUSR1,
+ .acqsig = SIGUSR2,
+ .frsig = 0,
+ };
+ if (ioctl(fd, VT_SETMODE, &mode) == -1) {
+ log_errorf("could not set VT mode: %s", strerror(errno));
+ close(fd);
+ return -1;
+ }
+
+ close(fd);
+ return 0;
+}
+
+int terminal_switch_vt(int vt) {
+ log_debugf("switching to vt %d", vt);
+ int fd = open("/dev/tty0", O_RDWR | O_NOCTTY);
+ if (fd == -1) {
+ log_errorf("could not open tty0: %s", strerror(errno));
+ return -1;
+ }
+
+ static struct vt_mode mode = {
+ .mode = VT_PROCESS,
+ .waitv = 0,
+ .relsig = SIGUSR1,
+ .acqsig = SIGUSR2,
+ .frsig = 0,
+ };
+
+ if (ioctl(fd, VT_SETMODE, &mode) == -1) {
+ log_errorf("could not set VT mode: %s", strerror(errno));
+ close(fd);
+ return -1;
+ }
+
+ if (ioctl(fd, VT_ACTIVATE, vt) == -1) {
+ log_errorf("could not activate VT: %s", strerror(errno));
+ close(fd);
+ return -1;
+ }
+
+ close(fd);
+ return 0;
+}
+
+int terminal_ack_switch(void) {
+ log_debug("acking vt switch");
+ int fd = open("/dev/tty0", O_RDWR | O_NOCTTY);
+ if (fd == -1) {
+ log_errorf("could not open tty0: %s", strerror(errno));
+ return -1;
+ }
+
+ int res = ioctl(fd, VT_RELDISP, VT_ACKACQ);
+ close(fd);
+ if (res == -1) {
+ log_errorf("could not ack VT switch: %s", strerror(errno));
+ }
+
+ return res;
+}
+
+int terminal_set_keyboard(int vt, bool enable) {
+ log_debugf("setting KD keyboard state to %d on vt %d", enable, vt);
+ if (vt == -1) {
+ vt = 0;
+ }
+ char path[TTYPATHLEN];
+ if (snprintf(path, TTYPATHLEN, "/dev/tty%d", vt) == -1) {
+ log_errorf("could not generate tty path: %s", strerror(errno));
+ return -1;
+ }
+ int fd = open(path, O_RDWR | O_NOCTTY);
+ if (fd == -1) {
+ log_errorf("could not generate tty path: %s", strerror(errno));
+ return -1;
+ }
+ int res = ioctl(fd, KDSKBMODE, enable ? K_UNICODE : K_OFF);
+ close(fd);
+ if (res == -1) {
+ log_errorf("could not set KD keyboard mode: %s", strerror(errno));
+ }
+ return res;
+}
+
+int terminal_set_graphics(int vt, bool enable) {
+ log_debugf("setting KD graphics state to %d on vt %d", enable, vt);
+ if (vt == -1) {
+ vt = 0;
+ }
+ char path[TTYPATHLEN];
+ if (snprintf(path, TTYPATHLEN, "/dev/tty%d", vt) == -1) {
+ log_errorf("could not generate tty path: %s", strerror(errno));
+ return -1;
+ }
+ int fd = open(path, O_RDWR | O_NOCTTY);
+ if (fd == -1) {
+ log_errorf("could not generate tty path: %s", strerror(errno));
+ return -1;
+ }
+ int res = ioctl(fd, KDSETMODE, enable ? KD_GRAPHICS : KD_TEXT);
+ close(fd);
+ if (res == -1) {
+ log_errorf("could not set KD graphics mode: %s", strerror(errno));
+ }
+ return res;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-10-31 03:06:16 +0000