1 files changed, 126 insertions, 0 deletions
diff --git a/misc-utils/lsfd-sock.c b/misc-utils/lsfd-sock.c
new file mode 100644
index 0000000..0ed5663
--- /dev/null
+++ b/misc-utils/lsfd-sock.c
@@ -0,0 +1,126 @@
+/*
+ * lsfd-sock.c - handle associations opening socket objects
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All rights reserved.
+ * Written by Masatake YAMATO <yamato@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <sys/types.h>
+#include <sys/xattr.h>
+
+#include "xalloc.h"
+#include "nls.h"
+#include "libsmartcols.h"
+
+#include "lsfd.h"
+
+struct sock {
+	struct file file;
+	char *protoname;
+};
+
+static bool sock_fill_column(struct proc *proc __attribute__((__unused__)),
+			     struct file *file,
+			     struct libscols_line *ln,
+			     int column_id,
+			     size_t column_index)
+{
+	char *str = NULL;
+	struct sock *sock = (struct sock *)file;
+	switch(column_id) {
+	case COL_TYPE:
+		if (scols_line_set_data(ln, column_index, "SOCK"))
+			err(EXIT_FAILURE, _("failed to add output data"));
+		return true;
+	case COL_PROTONAME:
+		if (sock->protoname)
+			if (scols_line_set_data(ln, column_index, sock->protoname))
+				err(EXIT_FAILURE, _("failed to add output data"));
+		return true;
+	case COL_NAME:
+		if (sock->protoname
+		    && file->name && strncmp(file->name, "socket:", 7) == 0) {
+			xasprintf(&str, "%s:%s", sock->protoname, file->name + 7);
+			break;
+		}
+		return false;
+	case COL_SOURCE:
+		if (major(file->stat.st_dev) == 0
+		    && strncmp(file->name, "socket:", 7) == 0) {
+			str = strdup("sockfs");
+			break;
+		}
+		return false;
+	default:
+		return false;
+	}
+
+	if (!str)
+		err(EXIT_FAILURE, _("failed to add output data"));
+	if (scols_line_refer_data(ln, column_index, str))
+		err(EXIT_FAILURE, _("failed to add output data"));
+	return true;
+}
+
+static void init_sock_content(struct file *file)
+{
+	int fd;
+
+	assert(file);
+
+	fd = file->association;
+
+	if (fd >= 0 || fd == -ASSOC_MEM || fd == -ASSOC_SHM) {
+		struct sock *sock = (struct sock *)file;
+		char path[PATH_MAX] = {'\0'};
+		char buf[256];
+		ssize_t len;
+
+		assert(file->proc);
+
+		if (fd >= 0)
+			sprintf(path, "/proc/%d/fd/%d", file->proc->pid, fd);
+		else
+			sprintf(path, "/proc/%d/map_files/%"PRIx64 "-%" PRIx64,
+				file->proc->pid,
+				file->map_start,
+				file->map_end);
+
+		len = getxattr(path, "system.sockprotoname", buf, sizeof(buf) - 1);
+		if (len > 0) {
+			buf[len] = '\0';
+			sock->protoname = xstrdup(buf);
+		}
+	}
+}
+
+static void free_sock_content(struct file *file)
+{
+	struct sock *sock = (struct sock *)file;
+	if (sock->protoname) {
+		free(sock->protoname);
+		sock->protoname = NULL;
+	}
+}
+
+const struct file_class sock_class = {
+	.super = &file_class,
+	.size = sizeof(struct sock),
+	.fill_column = sock_fill_column,
+	.initialize_content = init_sock_content,
+	.free_content = free_sock_content,
+};