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-rw-r--r--src/ipsw.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/src/ipsw.c b/src/ipsw.c
index b9ebdff..033b894 100644
--- a/src/ipsw.c
+++ b/src/ipsw.c
@@ -23,6 +23,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <openssl/sha.h>
#include "ipsw.h"
#include "idevicerestore.h"
@@ -219,3 +220,237 @@ void ipsw_close(ipsw_archive* archive) {
free(archive);
}
}
+
+static int get_latest_fw(plist_t version_data, const char* product, char** fwurl, unsigned char* sha1buf)
+{
+ *fwurl = NULL;
+ memset(sha1buf, '\0', 20);
+
+ plist_t n1 = plist_access_path(version_data, 2, "MobileDeviceMajorVersionsByProductType", product);
+ if (!n1 || (plist_dict_get_size(n1) == 0)) {
+ error("%s: ERROR: Can't find MobileDeviceMajorVersionsByProductType/%s dict in version data\n", __func__, product);
+ return -1;
+ }
+
+ char* strval = NULL;
+ plist_t n2 = plist_dict_get_item(n1, "SameAs");
+ if (n2) {
+ plist_get_string_val(n2, &strval);
+ }
+ if (strval) {
+ n1 = plist_access_path(version_data, 2, "MobileDeviceMajorVersionsByProductType", strval);
+ free(strval);
+ strval = NULL;
+ if (!n1 || (plist_dict_get_size(n1) == 0)) {
+ error("%s: ERROR: Can't find MobileDeviceMajorVersionsByProductType/%s dict in version data\n", __func__, product);
+ return -1;
+ }
+ }
+
+ plist_dict_iter iter = NULL;
+ plist_dict_new_iter(n1, &iter);
+ if (!iter) {
+ error("%s: ERROR: Can't get dict iter\n", __func__);
+ return -1;
+ }
+ n2 = NULL;
+ char* key = NULL;
+ plist_t val = NULL;
+ do {
+ plist_dict_next_item(n1, iter, &key, &val);
+ if (key) {
+ n2 = val;
+ free(key);
+ }
+ } while (val);
+ free(iter);
+
+ if (!n2) {
+ error("%s: ERROR: Can't get last node?!\n", __func__);
+ return -1;
+ }
+
+ uint64_t major = 0;
+ if (plist_get_node_type(n2) == PLIST_ARRAY) {
+ uint32_t sz = plist_array_get_size(n2);
+ plist_t n3 = plist_array_get_item(n2, sz-1);
+ plist_get_uint_val(n3, &major);
+ } else {
+ plist_get_uint_val(n2, &major);
+ }
+
+ if (major == 0) {
+ error("%s: ERROR: Can't find major version?!\n", __func__);
+ return -1;
+ }
+
+ char majstr[32]; // should be enough for a uint64_t value
+ sprintf(majstr, FMT_qu, (long long unsigned int)major);
+ n1 = plist_access_path(version_data, 7, "MobileDeviceSoftwareVersionsByVersion", majstr, "MobileDeviceSoftwareVersions", product, "Unknown", "Universal", "Restore");
+ if (!n1) {
+ error("%s: ERROR: Can't get Unknown/Universal/Restore node?!\n", __func__);
+ return -1;
+ }
+
+ n2 = plist_dict_get_item(n1, "BuildVersion");
+ if (!n2 || (plist_get_node_type(n2) != PLIST_STRING)) {
+ error("%s: ERROR: Can't get build version node?!\n", __func__);
+ return -1;
+ }
+
+ strval = NULL;
+ plist_get_string_val(n2, &strval);
+
+ n1 = plist_access_path(version_data, 5, "MobileDeviceSoftwareVersionsByVersion", majstr, "MobileDeviceSoftwareVersions", product, strval);
+ if (!n1) {
+ error("%s: ERROR: Can't get MobileDeviceSoftwareVersions/%s node?!\n", __func__, strval);
+ free(strval);
+ return -1;
+ }
+ free(strval);
+
+ strval = NULL;
+ n2 = plist_dict_get_item(n1, "SameAs");
+ if (n2) {
+ plist_get_string_val(n2, &strval);
+ }
+ if (strval) {
+ n1 = plist_access_path(version_data, 5, "MobileDeviceSoftwareVersionsByVersion", majstr, "MobileDeviceSoftwareVersions", product, strval);
+ free(strval);
+ strval = NULL;
+ if (!n1 || (plist_dict_get_size(n1) == 0)) {
+ error("%s: ERROR: Can't get MobileDeviceSoftwareVersions/%s dict\n", __func__, product);
+ return -1;
+ }
+ }
+
+ n2 = plist_access_path(n1, 2, "Update", "BuildVersion");
+ if (n2) {
+ strval = NULL;
+ plist_get_string_val(n2, &strval);
+ if (strval) {
+ n1 = plist_access_path(version_data, 5, "MobileDeviceSoftwareVersionsByVersion", majstr, "MobileDeviceSoftwareVersions", product, strval);
+ free(strval);
+ strval = NULL;
+ }
+ }
+
+ n2 = plist_access_path(n1, 2, "Restore", "FirmwareURL");
+ if (!n2 || (plist_get_node_type(n2) != PLIST_STRING)) {
+ error("%s: ERROR: Can't get FirmwareURL node\n", __func__);
+ return -1;
+ }
+
+ plist_get_string_val(n2, fwurl);
+
+ n2 = plist_access_path(n1, 2, "Restore", "FirmwareSHA1");
+ if (n2 && plist_get_node_type(n2) == PLIST_STRING) {
+ strval = NULL;
+ plist_get_string_val(n2, &strval);
+ if (strval) {
+ if (strlen(strval) == 40) {
+ int i;
+ int v;
+ for (i = 0; i < 40; i+=2) {
+ v = 0;
+ sscanf(strval+i, "%02x", &v);
+ sha1buf[i/2] = (unsigned char)v;
+ }
+ }
+ free(strval);
+ }
+ }
+
+ return 0;
+}
+
+static int sha1_verify_fp(FILE* f, unsigned char* expected_sha1)
+{
+ unsigned char tsha1[20];
+ char buf[8192];
+ if (!f) return 0;
+ SHA_CTX sha1ctx;
+ SHA1_Init(&sha1ctx);
+ rewind(f);
+ while (!feof(f)) {
+ size_t sz = fread(buf, 1, 8192, f);
+ SHA1_Update(&sha1ctx, (const void*)buf, sz);
+ }
+ SHA1_Final(tsha1, &sha1ctx);
+ return (memcmp(expected_sha1, tsha1, 20) == 0) ? 1 : 0;
+}
+
+int ipsw_download_latest_fw(plist_t version_data, const char* product, const char* todir, char** ipswfile)
+{
+ char* fwurl = NULL;
+ unsigned char isha1[20];
+
+ *ipswfile = NULL;
+
+ if ((get_latest_fw(version_data, product, &fwurl, isha1) < 0) || !fwurl) {
+ error("ERROR: can't get URL for latest firmware\n");
+ return -1;
+ }
+ char* fwfn = strrchr(fwurl, '/');
+ if (!fwfn) {
+ error("ERROR: can't get local filename for firmware ipsw\n");
+ return -1;
+ }
+ fwfn++;
+
+ info("Latest firmware is %s\n", fwfn);
+
+ char fwlfn[256];
+ sprintf(fwlfn, "%s/%s", todir, fwfn);
+
+ int need_dl = 0;
+ unsigned char zsha1[20] = {0, };
+ FILE* f = fopen(fwlfn, "rb");
+ if (f) {
+ if (memcmp(zsha1, isha1, 20) != 0) {
+ info("Verifying '%s'...\n", fwlfn);
+ if (sha1_verify_fp(f, isha1)) {
+ info("Checksum matches.\n");
+ } else {
+ info("Checksum does not match.\n");
+ need_dl = 1;
+ }
+ }
+ fclose(f);
+ } else {
+ need_dl = 1;
+ }
+
+ int res = 0;
+ if (need_dl) {
+ if (strncmp(fwurl, "protected:", 10) == 0) {
+ error("ERROR: Can't download '%s' because it needs a purchase.\n", fwfn);
+ res = -1;
+ } else {
+ remove(fwlfn);
+ info("Downloading latest firmware (%s)\n", fwurl);
+ download_to_file(fwurl, fwlfn);
+ if (memcmp(isha1, zsha1, 20) != 0) {
+ info("\nVerifying '%s'...\n", fwlfn);
+ FILE* f = fopen(fwlfn, "rb");
+ if (f) {
+ if (sha1_verify_fp(f, isha1)) {
+ info("Checksum matches.\n");
+ } else {
+ error("ERROR: File download failed (checksum mismatch).\n");
+ res = -1;
+ }
+ fclose(f);
+ } else {
+ error("ERROR: Can't open '%s' for checksum verification\n", fwlfn);
+ res = -1;
+ }
+ }
+ }
+ }
+ free(fwurl);
+ if (res == 0) {
+ *ipswfile = strdup(fwlfn);
+ }
+ return res;
+}
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