From 4405a0fff74faaed363bc3ea4c4997293ac9d4a3 Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Thu, 29 Jul 2021 02:45:10 +0200
Subject: common: Return proper error codes from userpref_read_pair_record

---
 common/userpref.c | 33 +++++++++++++++++++--------------
 common/userpref.h |  9 +++++----
 2 files changed, 24 insertions(+), 18 deletions(-)

(limited to 'common')

diff --git a/common/userpref.c b/common/userpref.c
index 0c6050f..bf7e1bd 100644
--- a/common/userpref.c
+++ b/common/userpref.c
@@ -309,8 +309,10 @@ userpref_error_t userpref_save_pair_record(const char *udid, uint32_t device_id,
  * @param udid The device UDID as given by the device
  * @param pair_record The pair record to read
  *
- * @return 1 on success and 0 if no device record is given or if it has already
- *         been saved previously.
+ * @return USERPREF_E_SUCCESS on success,
+ *     USERPREF_E_NOENT if no pairing record was found,
+ *     USERPREF_E_READ_ERROR if retrieving the pairing record from usbmuxd failed,
+ *     or USERPREF_E_INVALID_CONF otherwise.
  */
 userpref_error_t userpref_read_pair_record(const char *udid, plist_t *pair_record)
 {
@@ -318,24 +320,27 @@ userpref_error_t userpref_read_pair_record(const char *udid, plist_t *pair_recor
 	uint32_t record_size = 0;
 
 	int res = usbmuxd_read_pair_record(udid, &record_data, &record_size);
-
 	if (res < 0) {
-		if (record_data)
-			free(record_data);
-
-		return USERPREF_E_INVALID_CONF;
+		free(record_data);
+		switch (-res) {
+		case ENOENT:
+			return USERPREF_E_NOENT;
+		case ETIMEDOUT:
+			return USERPREF_E_READ_ERROR;
+		default:
+			return USERPREF_E_INVALID_CONF;
+		}
 	}
 
 	*pair_record = NULL;
-	if (memcmp(record_data, "bplist00", 8) == 0) {
-		plist_from_bin(record_data, record_size, pair_record);
-	} else {
-		plist_from_xml(record_data, record_size, pair_record);
-	}
-
+	plist_from_memory(record_data, record_size, pair_record);
 	free(record_data);
 
-	return res == 0 ? USERPREF_E_SUCCESS: USERPREF_E_UNKNOWN_ERROR;
+	if (!*pair_record) {
+		debug_info("Failed to parse pairing record");
+		return USERPREF_E_INVALID_CONF;
+	}
+	return USERPREF_E_SUCCESS;
 }
 
 /**
diff --git a/common/userpref.h b/common/userpref.h
index 072721a..75bb8b7 100644
--- a/common/userpref.h
+++ b/common/userpref.h
@@ -54,10 +54,11 @@ typedef gnutls_datum_t key_data_t;
 typedef enum {
 	USERPREF_E_SUCCESS       =  0,
 	USERPREF_E_INVALID_ARG   = -1,
-	USERPREF_E_INVALID_CONF  = -2,
-	USERPREF_E_SSL_ERROR     = -3,
-	USERPREF_E_READ_ERROR    = -4,
-	USERPREF_E_WRITE_ERROR   = -5,
+	USERPREF_E_NOENT         = -2,
+	USERPREF_E_INVALID_CONF  = -3,
+	USERPREF_E_SSL_ERROR     = -4,
+	USERPREF_E_READ_ERROR    = -5,
+	USERPREF_E_WRITE_ERROR   = -6,
 	USERPREF_E_UNKNOWN_ERROR = -256
 } userpref_error_t;
 
-- 
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