From 069009f8e39238ec1a67fba6cfb287b9a0cac83e Mon Sep 17 00:00:00 2001
From: Alice Frosi <afrosi@redhat.com>
Date: Fri, 24 Mar 2023 10:07:48 +0100
Subject: Re-organize project and add license header

---
 src/common/common.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/common/common.c

(limited to 'src/common/common.c')

diff --git a/src/common/common.c b/src/common/common.c
new file mode 100644
index 0000000..a8f79a2
--- /dev/null
+++ b/src/common/common.c
@@ -0,0 +1,51 @@
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+int find_fd_seccomp_notifier(const char *path)
+{
+	char entry[2 * PATH_MAX + 1];
+	char buf[PATH_MAX + 1];
+	struct dirent *dp;
+	ssize_t nbytes;
+	struct stat sb;
+	DIR *dirp;
+
+	if ((dirp = opendir(path)) == NULL) {
+		fprintf(stderr, "failed reading fds from proc: %s \n", path);
+		return -1;
+	}
+	while ((dp = readdir(dirp)) != NULL) {
+		snprintf(entry, sizeof(entry), "%s/%s", path, dp->d_name);
+		if (lstat(entry, &sb) == -1) {
+			perror("lstat");
+		}
+		/* Skip the entry if it isn't a symbolic link */
+		if (!S_ISLNK(sb.st_mode))
+			continue;
+
+		nbytes = readlink(entry, buf, PATH_MAX);
+		if (nbytes == -1) {
+			perror("readlink");
+		}
+		if (nbytes == PATH_MAX) {
+			perror("buffer overflow");
+			continue;
+		}
+		/*
+                 * From man proc: For  file  descriptors  that  have no
+                 * corresponding inode (e.g., file descriptors produced by
+                 * bpf(2)..), the  entry  will be a symbolic link with contents
+                 * of the form:
+                 *      anon_inode:<file-type>
+                 */
+		if (strstr(buf, "anon_inode:seccomp notify") != NULL)
+			return atoi(dp->d_name);
+	}
+	fprintf(stderr, "seccomp notifier not found in %s\n", path);
+	return -1;
+}
-- 
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