support updating the challenge on boot

1 files changed, 220 insertions, 0 deletions

diff --git a/bin/ykfde-cpio.c b/bin/ykfde-cpio.c
new file mode 100644
index 0000000..71a39db
--- /dev/null
+++ b/bin/ykfde-cpio.c
@@ -0,0 +1,220 @@
+/*
+ * (C) 2014 by Christian Hesse <mail@eworm.de>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ * compile with:
+ * $ gcc -o mkcpio mkcpio.c -larchive
+ */
+
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include <archive.h>
+#include <archive_entry.h>
+
+#define CONFIGFILE      "/etc/ykfde.conf"
+#define CHALLENGEDIR    "/etc/ykfde.d/"
+#define CPIOFILE	"/boot/ykfde-challenges.img"
+#define CPIOTMPFILE	CPIOFILE "-XXXXXX"
+
+int add_dir(struct archive *archive, const char * path) {
+	struct stat st;
+	struct archive_entry *entry;
+	int8_t rc;
+
+	/* initialize struct stat for directories from root */
+	if ((rc = stat("/", &st)) < 0) {
+		perror("stat() failed");
+		goto out;
+	}
+
+	if ((entry = archive_entry_new()) == NULL) {
+		rc = EXIT_FAILURE;
+		fprintf(stderr, "archive_entry_new() failed");
+		goto out;
+	}
+
+	archive_entry_set_pathname(entry, path);
+	archive_entry_set_filetype(entry, AE_IFDIR);
+	archive_entry_copy_stat(entry, &st);
+	if (archive_write_header(archive, entry) != ARCHIVE_OK) {
+		rc = EXIT_FAILURE;
+		fprintf(stderr, "archive_write_header() failed");
+		goto out;
+	}
+	archive_entry_free(entry);
+
+	rc = EXIT_SUCCESS;
+
+out:
+	return rc;
+}
+
+int main(int argc, const char **argv) {
+	char cpiotmpfile[] = CPIOTMPFILE;
+	struct archive *archive;
+	struct archive_entry *entry;
+	struct stat st;
+	char buff[64];
+	int len, fdfile, fdarchive;
+	DIR * dir;
+	struct dirent * ent;
+	char * filename, * path;
+	off_t pathlength = 0;
+	int8_t rc = EXIT_FAILURE;
+
+	if ((rc = fdarchive = mkstemp(cpiotmpfile)) < 0) {
+		perror("mkstemp() failed");
+		goto out10;
+	}
+
+	if ((archive = archive_write_new()) == NULL) {
+		rc = EXIT_FAILURE;
+		fprintf(stderr, "archive_write_new() failed.\n");
+		goto out10;
+	}
+
+	if (archive_write_set_format_cpio_newc(archive) != ARCHIVE_OK) {
+		rc = EXIT_FAILURE;
+		fprintf(stderr, "archive_write_set_format_cpio_newc() failed.\n");
+		goto out10;
+	}
+
+	if (archive_write_open_fd(archive, fdarchive) != ARCHIVE_OK) {
+		rc = EXIT_FAILURE;
+		fprintf(stderr, "archive_write_open_fd() failed.\n");
+		goto out10;
+	}
+
+	if ((rc = add_dir(archive, ".")) < 0) {
+		fprintf(stderr, "add_dir() failed");
+		goto out10;
+	}
+
+        while (1) {
+		path = strdup(CHALLENGEDIR + 1);
+		if (strstr(path + pathlength, "/") == NULL)
+			break;
+		*strstr(path + pathlength, "/") = 0;
+		pathlength = strlen(path) + 1;
+
+		if ((rc = add_dir(archive, path)) < 0) {
+			fprintf(stderr, "add_dir() failed");
+			goto out10;
+		}
+
+		free(path);
+	}
+
+	if ((dir = opendir(CHALLENGEDIR)) != NULL) {
+		while ((ent = readdir(dir)) != NULL) {
+			filename = malloc(sizeof(CHALLENGEDIR) + strlen(ent->d_name) + 1);
+			sprintf(filename, CHALLENGEDIR "%s", ent->d_name);
+
+			if ((rc = stat(filename, &st)) < 0) {
+				perror("stat() failed");
+				goto out10;
+			}
+
+			if (S_ISREG(st.st_mode)) {
+				if ((entry = archive_entry_new()) == NULL) {
+					rc = EXIT_FAILURE;
+					fprintf(stderr, "archive_entry_new() failed.\n");
+					goto out10;
+				}
+
+				/* these do not return exit code */
+				archive_entry_set_pathname(entry, filename + 1);
+				archive_entry_set_size(entry, st.st_size);
+				archive_entry_set_filetype(entry, AE_IFREG);
+				archive_entry_set_perm(entry, 0644);
+
+				if (archive_write_header(archive, entry) != ARCHIVE_OK) {
+					rc = EXIT_FAILURE;
+					fprintf(stderr, "archive_write_header() failed");
+					goto out10;
+				}
+
+				if ((rc = fdfile = open(filename, O_RDONLY)) < 0) {
+					perror("open() failed");
+					goto out10;
+				}
+
+				if ((rc = len = read(fdfile, buff, sizeof(buff))) < 0) {
+					perror("read() failed");
+					goto out10;
+				}
+
+				while (len > 0) {
+					if (( rc = archive_write_data(archive, buff, len)) < 0) {
+						fprintf(stderr, "archive_write_data() failed");
+						goto out10;
+					}
+
+					if ((rc = len = read(fdfile, buff, sizeof(buff))) < 0) {
+						perror("read() failed");
+						goto out10;
+					}
+				}
+
+				if ((rc = close(fdfile)) < 0) {
+					perror("close() failed");
+					goto out10;
+				}
+
+				archive_entry_free(entry);
+			}
+			free(filename);
+		}
+		if ((rc = closedir(dir)) < 0) {
+			perror("closedir() failed");
+			goto out10;
+		}
+	} else {
+		rc = EXIT_FAILURE;
+		perror("opendir() failed");
+		goto out10;
+	}
+
+	if (archive_write_close(archive) != ARCHIVE_OK) {
+		rc = EXIT_FAILURE;
+		fprintf(stderr, "archive_write_close() failed");
+		goto out10;
+	}
+
+	if (archive_write_free(archive) != ARCHIVE_OK) {
+		rc = EXIT_FAILURE;
+		fprintf(stderr, "archive_write_free() failed");
+		goto out10;
+	}
+
+	if (access(CPIOFILE, F_OK) == 0 && (rc = unlink(CPIOFILE)) < 0) {
+		perror("unkink() failed");
+		goto out10;
+	}
+
+	if ((rc = rename(cpiotmpfile, CPIOFILE)) < 0) {
+		perror("rename() failed");
+		goto out10;
+	}
+
+	rc = EXIT_SUCCESS;
+
+out10:
+	if (access(cpiotmpfile, F_OK) == 0)
+		unlink(cpiotmpfile);
+
+	return rc;
+}
+
+// vim: set syntax=c: