From c871c591e36d2a4083e3dda4c70144a0321ce70f Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Thu, 2 Nov 2023 12:54:47 +0100
Subject: Extract OS component when using older ipsw archives

Older ipsw archives have the root filesystem stored in compressed
format rather than just "stored". The "Verifying Filesystem" step
would then fail as compressed files are not seekable in ZIP files.
This commit introduces a detection for this and has the filesystem
extracted should it be required.
If not using a cache path, the temp file used for extraction will
be deleted after the procedure is completed.
---
 src/restore.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'src/restore.c')

diff --git a/src/restore.c b/src/restore.c
index 8063f08..9e0268a 100644
--- a/src/restore.c
+++ b/src/restore.c
@@ -29,6 +29,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <libgen.h>
 #include <libimobiledevice/restore.h>
 #ifdef HAVE_REVERSE_PROXY
 #include <libimobiledevice/reverse_proxy.h>
@@ -903,13 +904,23 @@ int restore_send_filesystem(struct idevicerestore_client_t* client, idevice_t de
 
 	info("About to send filesystem...\n");
 
+	ipsw_archive_t ipsw_dummy = NULL;
 	ipsw_file_handle_t file = NULL;
 	char* fsname = NULL;
 	if (build_identity_get_component_path(build_identity, "OS", &fsname) < 0) {
 		error("ERROR: Unable to get path for filesystem component\n");
 		return -1;
 	}
-	file = ipsw_file_open(client->ipsw, fsname);
+	if (client->filesystem) {
+		char* path = strdup(client->filesystem);
+		char* fsname_base = path_get_basename(path);
+		char* parent_dir = dirname(path);
+		ipsw_dummy = ipsw_open(parent_dir);
+		free(path);
+		file = ipsw_file_open(ipsw_dummy, fsname_base);
+	} else {
+		file = ipsw_file_open(client->ipsw, fsname);
+	}
 	if (!file) {
 		error("ERROR: Unable to open '%s' in ipsw\n", fsname);
 		free(fsname);
@@ -917,6 +928,7 @@ int restore_send_filesystem(struct idevicerestore_client_t* client, idevice_t de
 
 	if (asr_open_with_timeout(device, &asr) < 0) {
 		ipsw_file_close(file);
+		ipsw_close(ipsw_dummy);
 		error("ERROR: Unable to connect to ASR\n");
 		return -1;
 	}
@@ -929,6 +941,7 @@ int restore_send_filesystem(struct idevicerestore_client_t* client, idevice_t de
 	info("Validating the filesystem\n");
 	if (asr_perform_validation(asr, file) < 0) {
 		ipsw_file_close(file);
+		ipsw_close(ipsw_dummy);
 		error("ERROR: ASR was unable to validate the filesystem\n");
 		asr_free(asr);
 		return -1;
@@ -940,11 +953,13 @@ int restore_send_filesystem(struct idevicerestore_client_t* client, idevice_t de
 	info("Sending filesystem now...\n");
 	if (asr_send_payload(asr, file) < 0) {
 		ipsw_file_close(file);
+		ipsw_close(ipsw_dummy);
 		error("ERROR: Unable to send payload to ASR\n");
 		asr_free(asr);
 		return -1;
 	}
 	ipsw_file_close(file);
+	ipsw_close(ipsw_dummy);
 
 	info("Done sending filesystem\n");
 
-- 
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