majorly de-indent code structure in secure_join by introducing cleanup function, also majorly reducing unsafety in several places

src/chat.rs

@@ -854,7 +854,7 @@ pub fn unarchive(context: &Context, chat_id: u32) -> Result<(), Error> {
 /// However, this does not imply, the message really reached the recipient -
 /// sending may be delayed eg. due to network problems. However, from your
 /// view, you're done with the message. Sooner or later it will find its way.
-pub unsafe fn send_msg<'a>(
+pub fn send_msg<'a>(
     context: &'a Context,
     chat_id: u32,
     msg: &mut Message<'a>,
@@ -872,7 +872,7 @@ pub unsafe fn send_msg<'a>(
     }
 
     ensure!(
-        job_send_msg(context, msg.id) != 0,
+        unsafe { job_send_msg(context, msg.id) } != 0,
         "Failed to initiate send job"
     );
 
@@ -1394,7 +1394,7 @@ pub unsafe fn add_contact_to_chat(context: &Context, chat_id: u32, contact_id: u
 
 // TODO should return bool /rtn
 #[allow(non_snake_case)]
-pub unsafe fn add_contact_to_chat_ex(
+pub fn add_contact_to_chat_ex(
     context: &Context,
     chat_id: u32,
     contact_id: u32,
@@ -1407,7 +1407,7 @@ pub unsafe fn add_contact_to_chat_ex(
     if contact.is_err() || chat_id <= DC_CHAT_ID_LAST_SPECIAL {
         return 0;
     }
-    let mut msg = dc_msg_new_untyped(context);
+    let mut msg = unsafe { dc_msg_new_untyped(context) };
 
     reset_gossiped_timestamp(context, chat_id);
     let contact = contact.unwrap();

src/configure/mod.rs

@@ -33,7 +33,7 @@ macro_rules! progress {
 
 // connect
 pub unsafe fn configure(context: &Context) {
-    if 0 != dc_has_ongoing(context) {
+    if dc_has_ongoing(context) {
         warn!(
             context,
             0, "There is already another ongoing process running.",
@@ -43,6 +43,7 @@ pub unsafe fn configure(context: &Context) {
     job_kill_action(context, Action::ConfigureImap);
     job_add(context, Action::ConfigureImap, 0, Params::new(), 0);
 }
+
 /// Check if the context is already configured.
 pub fn dc_is_configured(context: &Context) -> libc::c_int {
     if context
@@ -56,17 +57,6 @@ pub fn dc_is_configured(context: &Context) -> libc::c_int {
         0
     }
 }
-/// Check if there is an ongoing process.
-unsafe fn dc_has_ongoing(context: &Context) -> libc::c_int {
-    let s_a = context.running_state.clone();
-    let s = s_a.read().unwrap();
-
-    if s.ongoing_running || !s.shall_stop_ongoing {
-        1
-    } else {
-        0
-    }
-}
 
 /*******************************************************************************
  * Configure JOB
@@ -80,7 +70,7 @@ pub unsafe fn dc_job_do_DC_JOB_CONFIGURE_IMAP(context: &Context, _job: &Job) {
     let mut ongoing_allocated_here = false;
 
     let mut param_autoconfig: Option<dc_loginparam_t> = None;
-    if !(0 == dc_alloc_ongoing(context)) {
+    if dc_alloc_ongoing(context) {
         ongoing_allocated_here = true;
         if !context.sql.is_open() {
             error!(context, 0, "Cannot configure, database not opened.",);
@@ -591,7 +581,45 @@ pub unsafe fn dc_job_do_DC_JOB_CONFIGURE_IMAP(context: &Context, _job: &Job) {
     progress!(context, (if success { 1000 } else { 0 }));
 }
 
-/* File Structure like in C: */
+/*******************************************************************************
+ * Ongoing process allocation/free/check 
+ ******************************************************************************/
+
+pub fn dc_alloc_ongoing(context: &Context) -> bool {
+    if dc_has_ongoing(context) {
+        warn!(
+            context,
+            0, "There is already another ongoing process running.",
+        );
+
+        false
+    } else {
+        let s_a = context.running_state.clone();
+        let mut s = s_a.write().unwrap();
+
+        s.ongoing_running = true;
+        s.shall_stop_ongoing = false;
+
+        true
+    }
+}
+
+pub fn dc_free_ongoing(context: &Context) {
+    let s_a = context.running_state.clone();
+    let mut s = s_a.write().unwrap();
+
+    s.ongoing_running = false;
+    s.shall_stop_ongoing = true;
+}
+
+
+fn dc_has_ongoing(context: &Context) -> bool {
+    let s_a = context.running_state.clone();
+    let s = s_a.read().unwrap();
+
+    s.ongoing_running || !s.shall_stop_ongoing
+}
+
 
 /*******************************************************************************
  * Connect to configured account
@@ -624,35 +652,6 @@ pub fn dc_connect_to_configured_imap(context: &Context, imap: &Imap) -> libc::c_
  * Configure a Context
  ******************************************************************************/
 
-/// Request an ongoing process to start.
-/// Returns 0=process started, 1=not started, there is running another process
-pub unsafe fn dc_alloc_ongoing(context: &Context) -> libc::c_int {
-    if 0 != dc_has_ongoing(context) {
-        warn!(
-            context,
-            0, "There is already another ongoing process running.",
-        );
-        return 0;
-    }
-    let s_a = context.running_state.clone();
-    let mut s = s_a.write().unwrap();
-
-    s.ongoing_running = true;
-    s.shall_stop_ongoing = false;
-
-    1
-}
-
-/// Frees the process allocated with dc_alloc_ongoing() - independently of dc_shall_stop_ongoing.
-/// If dc_alloc_ongoing() fails, this function MUST NOT be called.
-pub unsafe fn dc_free_ongoing(context: &Context) {
-    let s_a = context.running_state.clone();
-    let mut s = s_a.write().unwrap();
-
-    s.ongoing_running = false;
-    s.shall_stop_ongoing = true;
-}
-
 /// Signal an ongoing process to stop.
 pub fn dc_stop_ongoing_process(context: &Context) {
     let s_a = context.running_state.clone();

src/dc_imex.rs

@@ -103,7 +103,7 @@ pub unsafe fn dc_imex_has_backup(
 pub unsafe fn dc_initiate_key_transfer(context: &Context) -> *mut libc::c_char {
     let mut setup_file_name: *mut libc::c_char = ptr::null_mut();
     let mut msg: Message;
-    if dc_alloc_ongoing(context) == 0 {
+    if !dc_alloc_ongoing(context) {
         return std::ptr::null_mut();
     }
     let setup_code = dc_create_setup_code(context);
@@ -502,11 +502,9 @@ pub unsafe fn dc_normalize_setup_code(
 pub unsafe fn dc_job_do_DC_JOB_IMEX_IMAP(context: &Context, job: &Job) {
     let mut ok_to_continue = true;
     let mut success: libc::c_int = 0;
-    let mut ongoing_allocated_here: libc::c_int = 0;
     let what: libc::c_int;
 
-    if !(0 == dc_alloc_ongoing(context)) {
+    if dc_alloc_ongoing(context) {
-        ongoing_allocated_here = 1;
         what = job.param.get_int(Param::Cmd).unwrap_or_default();
         let param1_s = job.param.get(Param::Arg).unwrap_or_default();
         let param1 = CString::yolo(param1_s);
@@ -564,9 +562,6 @@ pub unsafe fn dc_job_do_DC_JOB_IMEX_IMAP(context: &Context, job: &Job) {
                 }
             }
         }
-    }
-
-    if 0 != ongoing_allocated_here {
         dc_free_ongoing(context);
     }
     context.call_cb(

src/dc_securejoin.rs

@@ -24,7 +24,7 @@ use crate::types::*;
 
 pub const NON_ALPHANUMERIC_WITHOUT_DOT: &AsciiSet = &NON_ALPHANUMERIC.remove(b'.');
 
-pub unsafe fn dc_get_securejoin_qr(context: &Context, group_chat_id: uint32_t) -> Option<String> {
+pub fn dc_get_securejoin_qr(context: &Context, group_chat_id: uint32_t) -> Option<String> {
     /* =========================================================
     ====             Alice - the inviter side            ====
     ====   Step 1 in "Setup verified contact" protocol   ====
@@ -117,36 +117,57 @@ fn get_self_fingerprint(context: &Context) -> Option<String> {
     None
 }
 
-pub unsafe fn dc_join_securejoin(context: &Context, qr: &str) -> uint32_t {
+pub fn dc_join_securejoin(context: &Context, qr: &str) -> uint32_t {
+    let cleanup =
+        |context: &Context, contact_chat_id: u32, ongoing_allocated: bool, join_vg: bool| {
+            let mut bob = context.bob.write().unwrap();
+            bob.expects = 0;
+            let ret_chat_id = if bob.status == DC_BOB_SUCCESS {
+                if join_vg {
+                    chat::get_chat_id_by_grpid(
+                        context,
+                        bob.qr_scan.as_ref().unwrap().text2.as_ref().unwrap(),
+                    )
+                    .0
+                } else {
+                    contact_chat_id
+                }
+            } else {
+                0
+            };
+            bob.qr_scan = None;
+
+            if ongoing_allocated {
+                dc_free_ongoing(context);
+            }
+            ret_chat_id as uint32_t
+        };
     /* ==========================================================
     ====             Bob - the joiner's side             =====
     ====   Step 2 in "Setup verified contact" protocol   =====
     ========================================================== */
-    let ongoing_allocated: libc::c_int;
     let mut contact_chat_id: uint32_t = 0;
     let mut join_vg: bool = false;
 
     info!(context, 0, "Requesting secure-join ...",);
     ensure_secret_key_exists(context).ok();
-    ongoing_allocated = dc_alloc_ongoing(context);
+    if !dc_alloc_ongoing(context) {
-
+        return cleanup(&context, contact_chat_id, false, join_vg);
-    if ongoing_allocated != 0 {
+    }
     let qr_scan = check_qr(context, &qr);
-        if qr_scan.state != LotState::QrAskVerifyContact
+    if qr_scan.state != LotState::QrAskVerifyContact && qr_scan.state != LotState::QrAskVerifyGroup
-            && qr_scan.state != LotState::QrAskVerifyGroup
     {
         error!(context, 0, "Unknown QR code.",);
-        } else {
+        return cleanup(&context, contact_chat_id, true, join_vg);
+    }
     contact_chat_id = chat::create_by_contact_id(context, qr_scan.id).unwrap_or_default();
     if contact_chat_id == 0 {
         error!(context, 0, "Unknown contact.",);
-            } else if !(context
+        return cleanup(&context, contact_chat_id, true, join_vg);
-                .running_state
+    }
-                .clone()
+    if check_exit(context) {
-                .read()
+        return cleanup(&context, contact_chat_id, true, join_vg);
-                .unwrap()
+    }
-                .shall_stop_ongoing)
-            {
     join_vg = qr_scan.get_state() == LotState::QrAskVerifyGroup;
     {
         let mut bob = context.bob.write().unwrap();
@@ -233,42 +254,22 @@ pub unsafe fn dc_join_securejoin(context: &Context, qr: &str) -> uint32_t {
     }
 
     // Bob -> Alice
-                while !(context
+    while !check_exit(&context) {
+        std::thread::sleep(std::time::Duration::new(0, 3_000_000));
+    }
+    cleanup(&context, contact_chat_id, true, join_vg)
+}
+
+fn check_exit(context: &Context) -> bool {
+    context
         .running_state
         .clone()
         .read()
         .unwrap()
-                    .shall_stop_ongoing)
+        .shall_stop_ongoing
-                {
-                    std::thread::sleep(std::time::Duration::new(0, 3_000_000));
-                }
-            }
-        }
-    }
-    let mut bob = context.bob.write().unwrap();
-    bob.expects = 0;
-    let ret_chat_id = if bob.status == 1 {
-        if join_vg {
-            chat::get_chat_id_by_grpid(
-                context,
-                bob.qr_scan.as_ref().unwrap().text2.as_ref().unwrap(),
-            )
-            .0
-        } else {
-            contact_chat_id
-        }
-    } else {
-        0
-    };
-    bob.qr_scan = None;
-
-    if 0 != ongoing_allocated {
-        dc_free_ongoing(context);
-    }
-    ret_chat_id as uint32_t
 }
 
-unsafe fn send_handshake_msg(
+fn send_handshake_msg(
     context: &Context,
     contact_chat_id: uint32_t,
     step: &str,
@@ -276,7 +277,7 @@ unsafe fn send_handshake_msg(
     fingerprint: Option<String>,
     grpid: impl AsRef<str>,
 ) {
-    let mut msg = dc_msg_new_untyped(context);
+    let mut msg = unsafe { dc_msg_new_untyped(context) };
     msg.type_0 = Viewtype::Text;
     msg.text = Some(format!("Secure-Join: {}", step));
     msg.hidden = true;
@@ -340,38 +341,34 @@ fn fingerprint_equals_sender(
 }
 
 /* library private: secure-join */
-pub unsafe fn dc_handle_securejoin_handshake(
+pub fn dc_handle_securejoin_handshake(
     context: &Context,
     mimeparser: &dc_mimeparser_t,
     contact_id: uint32_t,
 ) -> libc::c_int {
-    let mut ok_to_continue: bool;
-    let step: String;
-    let join_vg: bool;
     let own_fingerprint: String;
-    let contact_chat_id: u32;
-    let contact_chat_id_blocked: Blocked;
-    let mut grpid = "".to_string();
-    let mut ret: libc::c_int = 0i32;
 
-    if !(contact_id <= DC_CONTACT_ID_LAST_SPECIAL) {
+    if contact_id <= DC_CONTACT_ID_LAST_SPECIAL {
-        step = lookup_field(mimeparser, "Secure-Join");
+        return 0;
-        if !step.is_empty() {
+    }
+    let step = lookup_field(mimeparser, "Secure-Join");
+    if step.is_empty() {
+        return 0;
+    }
     info!(
         context,
         0, ">>>>>>>>>>>>>>>>>>>>>>>>> secure-join message \'{}\' received", step,
     );
-            join_vg = step.starts_with("vg-");
+    let (contact_chat_id, contact_chat_id_blocked) =
-            let (id, bl) = chat::create_or_lookup_by_contact_id(context, contact_id, Blocked::Not)
+        chat::create_or_lookup_by_contact_id(context, contact_id, Blocked::Not).unwrap_or_default();
-                .unwrap_or_default();
-            contact_chat_id = id;
-            contact_chat_id_blocked = bl;
 
-            if Blocked::Not != contact_chat_id_blocked {
+    if contact_chat_id_blocked != Blocked::Not {
         chat::unblock(context, contact_chat_id);
     }
-            ret = DC_HANDSHAKE_STOP_NORMAL_PROCESSING;
+    let mut ret: libc::c_int = DC_HANDSHAKE_STOP_NORMAL_PROCESSING;
-            if step == "vg-request" || step == "vc-request" {
+    let join_vg = step.starts_with("vg-");
+    match step.as_str() {
+        "vg-request" | "vc-request" => {
             /* =========================================================
             ====             Alice - the inviter side            ====
             ====   Step 3 in "Setup verified contact" protocol   ====
@@ -383,11 +380,12 @@ pub unsafe fn dc_handle_securejoin_handshake(
             let invitenumber = lookup_field(mimeparser, "Secure-Join-Invitenumber");
             if invitenumber == "" {
                 warn!(context, 0, "Secure-join denied (invitenumber missing).",);
-                    ok_to_continue = false;
+                return ret;
-                } else if !dc_token_exists(context, DC_TOKEN_INVITENUMBER, &invitenumber) {
+            }
+            if !dc_token_exists(context, DC_TOKEN_INVITENUMBER, &invitenumber) {
                 warn!(context, 0, "Secure-join denied (bad invitenumber).",);
-                    ok_to_continue = false;
+                return ret;
-                } else {
+            }
             info!(context, 0, "Secure-join requested.",);
 
             context.call_cb(
@@ -407,9 +405,8 @@ pub unsafe fn dc_handle_securejoin_handshake(
                 None,
                 "",
             );
-                    ok_to_continue = true;
         }
-            } else if step == "vg-auth-required" || step == "vc-auth-required" {
+        "vg-auth-required" | "vc-auth-required" => {
             let cond = {
                 let bob = context.bob.read().unwrap();
                 let scan = bob.qr_scan.as_ref();
@@ -421,8 +418,8 @@ pub unsafe fn dc_handle_securejoin_handshake(
             if cond {
                 warn!(context, 0, "auth-required message out of sync.",);
                 // no error, just aborted somehow or a mail from another handshake
-                    ok_to_continue = false;
+                return ret;
-                } else {
+            }
             let scanned_fingerprint_of_alice = context
                 .bob
                 .read()
@@ -446,20 +443,6 @@ pub unsafe fn dc_handle_securejoin_handshake(
                 .as_ref()
                 .unwrap()
                 .to_string();
-                    if join_vg {
-                        grpid = context
-                            .bob
-                            .read()
-                            .unwrap()
-                            .qr_scan
-                            .as_ref()
-                            .unwrap()
-                            .text2
-                            .as_ref()
-                            .unwrap()
-                            .to_string();
-                    }
-
             if !encrypted_and_signed(mimeparser, &scanned_fingerprint_of_alice) {
                 could_not_establish_secure_connection(
                     context,
@@ -471,20 +454,17 @@ pub unsafe fn dc_handle_securejoin_handshake(
                     },
                 );
                 end_bobs_joining(context, DC_BOB_ERROR);
-                        ok_to_continue = false;
+                return ret;
-                    } else if !fingerprint_equals_sender(
+            }
-                        context,
+            if !fingerprint_equals_sender(context, &scanned_fingerprint_of_alice, contact_chat_id) {
-                        &scanned_fingerprint_of_alice,
-                        contact_chat_id,
-                    ) {
                 could_not_establish_secure_connection(
                     context,
                     contact_chat_id,
                     "Fingerprint mismatch on joiner-side.",
                 );
                 end_bobs_joining(context, DC_BOB_ERROR);
-                        ok_to_continue = false;
+                return ret;
-                    } else {
+            }
             info!(context, 0, "Fingerprint verified.",);
             own_fingerprint = get_self_fingerprint(context).unwrap();
             context.call_cb(
@@ -494,6 +474,22 @@ pub unsafe fn dc_handle_securejoin_handshake(
             );
             context.bob.write().unwrap().expects = DC_VC_CONTACT_CONFIRM;
 
+            let grpid = if join_vg {
+                context
+                    .bob
+                    .read()
+                    .unwrap()
+                    .qr_scan
+                    .as_ref()
+                    .unwrap()
+                    .text2
+                    .as_ref()
+                    .unwrap()
+                    .to_string()
+            } else {
+                "".to_string()
+            };
+
             send_handshake_msg(
                 context,
                 contact_chat_id,
@@ -506,10 +502,8 @@ pub unsafe fn dc_handle_securejoin_handshake(
                 Some(own_fingerprint),
                 grpid,
             );
-                        ok_to_continue = true;
         }
-                }
+        "vg-request-with-auth" | "vc-request-with-auth" => {
-            } else if step == "vg-request-with-auth" || step == "vc-request-with-auth" {
             /* ============================================================
             ====              Alice - the inviter side              ====
             ====   Steps 5+6 in "Setup verified contact" protocol   ====
@@ -523,22 +517,24 @@ pub unsafe fn dc_handle_securejoin_handshake(
                     contact_chat_id,
                     "Fingerprint not provided.",
                 );
-                    ok_to_continue = false;
+                return ret;
-                } else if !encrypted_and_signed(mimeparser, &fingerprint) {
+            }
+            if !encrypted_and_signed(mimeparser, &fingerprint) {
                 could_not_establish_secure_connection(
                     context,
                     contact_chat_id,
                     "Auth not encrypted.",
                 );
-                    ok_to_continue = false;
+                return ret;
-                } else if !fingerprint_equals_sender(context, &fingerprint, contact_chat_id) {
+            }
+            if !fingerprint_equals_sender(context, &fingerprint, contact_chat_id) {
                 could_not_establish_secure_connection(
                     context,
                     contact_chat_id,
                     "Fingerprint mismatch on inviter-side.",
                 );
-                    ok_to_continue = false;
+                return ret;
-                } else {
+            }
             info!(context, 0, "Fingerprint verified.",);
             // verify that the `Secure-Join-Auth:`-header matches the secret written to the QR code
             let auth_0 = lookup_field(mimeparser, "Secure-Join-Auth");
@@ -548,27 +544,21 @@ pub unsafe fn dc_handle_securejoin_handshake(
                     contact_chat_id,
                     "Auth not provided.",
                 );
-                        ok_to_continue = false;
+                return ret;
-                    } else if !dc_token_exists(context, DC_TOKEN_AUTH, &auth_0) {
+            }
-                        could_not_establish_secure_connection(
+            if !dc_token_exists(context, DC_TOKEN_AUTH, &auth_0) {
-                            context,
+                could_not_establish_secure_connection(context, contact_chat_id, "Auth invalid.");
-                            contact_chat_id,
+                return ret;
-                            "Auth invalid.",
+            }
-                        );
+            if mark_peer_as_verified(context, fingerprint).is_err() {
-                        ok_to_continue = false;
-                    } else if mark_peer_as_verified(context, fingerprint).is_err() {
                 could_not_establish_secure_connection(
                     context,
                     contact_chat_id,
                     "Fingerprint mismatch on inviter-side.",
                 );
-                        ok_to_continue = false;
+                return ret;
-                    } else {
+            }
-                        Contact::scaleup_origin_by_id(
+            Contact::scaleup_origin_by_id(context, contact_id, Origin::SecurejoinInvited);
-                            context,
-                            contact_id,
-                            Origin::SecurejoinInvited,
-                        );
             info!(context, 0, "Auth verified.",);
             secure_connection_established(context, contact_chat_id);
             context.call_cb(
@@ -582,59 +572,43 @@ pub unsafe fn dc_handle_securejoin_handshake(
                 600i32 as uintptr_t,
             );
             if join_vg {
-                            grpid = lookup_field(mimeparser, "Secure-Join-Group");
+                let grpid = lookup_field(mimeparser, "Secure-Join-Group");
                 let (group_chat_id, _, _) = chat::get_chat_id_by_grpid(context, &grpid);
                 if group_chat_id == 0 {
                     error!(context, 0, "Chat {} not found.", &grpid);
-                                ok_to_continue = false;
+                    return ret;
                 } else {
-                                chat::add_contact_to_chat_ex(
+                    chat::add_contact_to_chat_ex(context, group_chat_id, contact_id, 0x1i32);
-                                    context,
-                                    group_chat_id,
-                                    contact_id,
-                                    0x1i32,
-                                );
-                                ok_to_continue = true;
                 }
             } else {
-                            send_handshake_msg(
+                send_handshake_msg(context, contact_chat_id, "vc-contact-confirm", "", None, "");
-                                context,
-                                contact_chat_id,
-                                "vc-contact-confirm",
-                                "",
-                                None,
-                                "",
-                            );
                 context.call_cb(
                     Event::SECUREJOIN_INVITER_PROGRESS,
                     contact_id as uintptr_t,
                     1000i32 as uintptr_t,
                 );
-                            ok_to_continue = true;
             }
         }
-                }
+        "vg-member-added" | "vc-contact-confirm" => {
-            } else if step == "vg-member-added" || step == "vc-contact-confirm" {
             if join_vg {
                 ret = DC_HANDSHAKE_CONTINUE_NORMAL_PROCESSING;
             }
             if context.bob.read().unwrap().expects != DC_VC_CONTACT_CONFIRM {
                 info!(context, 0, "Message belongs to a different handshake.",);
-                    ok_to_continue = false;
+                return ret;
-                } else {
+            }
             let cond = {
                 let bob = context.bob.read().unwrap();
                 let scan = bob.qr_scan.as_ref();
-                        scan.is_none()
+                scan.is_none() || join_vg && scan.unwrap().state != LotState::QrAskVerifyGroup
-                            || join_vg && scan.unwrap().state != LotState::QrAskVerifyGroup
             };
             if cond {
                 warn!(
                     context,
                     0, "Message out of sync or belongs to a different handshake.",
                 );
-                        ok_to_continue = false;
+                return ret;
-                    } else {
+            }
             let scanned_fingerprint_of_alice = context
                 .bob
                 .read()
@@ -647,8 +621,8 @@ pub unsafe fn dc_handle_securejoin_handshake(
                 .unwrap()
                 .to_string();
 
-                        if join_vg {
+            let vg_expect_encrypted = if join_vg {
-                            grpid = context
+                let grpid = context
                     .bob
                     .read()
                     .unwrap()
@@ -659,11 +633,7 @@ pub unsafe fn dc_handle_securejoin_handshake(
                     .as_ref()
                     .unwrap()
                     .to_string();
-                        }
+                let (_, is_verified_group, _) = chat::get_chat_id_by_grpid(context, grpid);
-
-                        let vg_expect_encrypted = if join_vg {
-                            let (_, is_verified_group, _) =
-                                chat::get_chat_id_by_grpid(context, grpid);
                 // when joining a non-verified group
                 // the vg-member-added message may be unencrypted
                 // when not all group members have keys or prefer encryption.
@@ -672,60 +642,38 @@ pub unsafe fn dc_handle_securejoin_handshake(
             } else {
                 true
             };
-                        if vg_expect_encrypted {
+            if vg_expect_encrypted
-                            if !encrypted_and_signed(mimeparser, &scanned_fingerprint_of_alice) {
+                && !encrypted_and_signed(mimeparser, &scanned_fingerprint_of_alice)
+            {
                 could_not_establish_secure_connection(
                     context,
                     contact_chat_id,
                     "Contact confirm message not encrypted.",
                 );
                 end_bobs_joining(context, DC_BOB_ERROR);
-                                ok_to_continue = false;
+                return ret;
-                            } else {
-                                ok_to_continue = true;
             }
-                        } else {
+
-                            ok_to_continue = true;
+            if mark_peer_as_verified(context, &scanned_fingerprint_of_alice).is_err() {
-                        }
-                        if ok_to_continue {
-                            if mark_peer_as_verified(context, &scanned_fingerprint_of_alice)
-                                .is_err()
-                            {
                 could_not_establish_secure_connection(
                     context,
                     contact_chat_id,
                     "Fingerprint mismatch on joiner-side.",
                 );
-                                ok_to_continue = false;
+                return ret;
-                            } else {
+            }
-                                Contact::scaleup_origin_by_id(
+            Contact::scaleup_origin_by_id(context, contact_id, Origin::SecurejoinJoined);
-                                    context,
-                                    contact_id,
-                                    Origin::SecurejoinJoined,
-                                );
             context.call_cb(
                 Event::CONTACTS_CHANGED,
                 0i32 as uintptr_t,
                 0i32 as uintptr_t,
             );
-                                if join_vg {
+            if join_vg
-                                    if !addr_equals_self(
+                && !addr_equals_self(context, lookup_field(mimeparser, "Chat-Group-Member-Added"))
-                                        context,
+            {
-                                        lookup_field(mimeparser, "Chat-Group-Member-Added"),
+                info!(context, 0, "Message belongs to a different handshake (scaled up contact anyway to allow creation of group).");
-                                    ) {
+                return ret;
-                                        info!(
-                                                context,
-                                                0,
-                                                "Message belongs to a different handshake (scaled up contact anyway to allow creation of group)."
-                                            );
-                                        ok_to_continue = false;
-                                    } else {
-                                        ok_to_continue = true;
             }
-                                } else {
-                                    ok_to_continue = true;
-                                }
-                                if ok_to_continue {
             secure_connection_established(context, contact_chat_id);
             context.bob.write().unwrap().expects = 0;
             if join_vg {
@@ -739,13 +687,8 @@ pub unsafe fn dc_handle_securejoin_handshake(
                 );
             }
             end_bobs_joining(context, DC_BOB_SUCCESS);
-                                    ok_to_continue = true;
         }
-                            }
+        "vg-member-added-received" => {
-                        }
-                    }
-                }
-            } else if step == "vg-member-added-received" {
             /* ============================================================
             ====              Alice - the inviter side              ====
             ====  Step 8 in "Out-of-band verified groups" protocol  ====
@@ -753,8 +696,8 @@ pub unsafe fn dc_handle_securejoin_handshake(
             if let Ok(contact) = Contact::get_by_id(context, contact_id) {
                 if contact.is_verified() == VerifiedStatus::Unverified {
                     warn!(context, 0, "vg-member-added-received invalid.",);
-                        ok_to_continue = false;
+                    return ret;
-                    } else {
+                }
                 context.call_cb(
                     Event::SECUREJOIN_INVITER_PROGRESS,
                     contact_id as uintptr_t,
@@ -765,23 +708,18 @@ pub unsafe fn dc_handle_securejoin_handshake(
                     contact_id as uintptr_t,
                     1000i32 as uintptr_t,
                 );
-                        ok_to_continue = true;
-                    }
             } else {
                 warn!(context, 0, "vg-member-added-received invalid.",);
-                    ok_to_continue = false;
+                return ret;
+            }
+        }
+        _ => {
+            warn!(context, 0, "invalid step: {}", step);
         }
-            } else {
-                ok_to_continue = true;
     }
-            if ok_to_continue {
     if ret == DC_HANDSHAKE_STOP_NORMAL_PROCESSING {
         ret |= DC_HANDSHAKE_ADD_DELETE_JOB;
     }
-            }
-        }
-    }
-
     ret
 }
 
@@ -790,7 +728,7 @@ fn end_bobs_joining(context: &Context, status: libc::c_int) {
     dc_stop_ongoing_process(context);
 }
 
-unsafe fn secure_connection_established(context: &Context, contact_chat_id: uint32_t) {
+fn secure_connection_established(context: &Context, contact_chat_id: uint32_t) {
     let contact_id: uint32_t = chat_id_2_contact_id(context, contact_chat_id);
     let contact = Contact::get_by_id(context, contact_id);
     let addr = if let Ok(ref contact) = contact {
@@ -807,8 +745,9 @@ unsafe fn secure_connection_established(context: &Context, contact_chat_id: uint
     );
 }
 
-unsafe fn lookup_field(mimeparser: &dc_mimeparser_t, key: &str) -> String {
+fn lookup_field(mimeparser: &dc_mimeparser_t, key: &str) -> String {
     let field: *mut mailimf_field = dc_mimeparser_lookup_field(mimeparser, key);
+    unsafe {
         let mut value: *const libc::c_char = ptr::null();
         if field.is_null()
             || (*field).fld_type != MAILIMF_FIELD_OPTIONAL_FIELD as libc::c_int
@@ -821,6 +760,7 @@ unsafe fn lookup_field(mimeparser: &dc_mimeparser_t, key: &str) -> String {
             return String::from("");
         }
         as_str(value).to_string()
+    }
 }
 
 fn could_not_establish_secure_connection(
@@ -864,23 +804,20 @@ fn mark_peer_as_verified(context: &Context, fingerprint: impl AsRef<str>) -> Res
  * Tools: Misc.
  ******************************************************************************/
 
-unsafe fn encrypted_and_signed(
+fn encrypted_and_signed(
     mimeparser: &dc_mimeparser_t,
     expected_fingerprint: impl AsRef<str>,
 ) -> bool {
     if !mimeparser.e2ee_helper.encrypted {
         warn!(mimeparser.context, 0, "Message not encrypted.",);
-        return false;
+        false
-    }
+    } else if mimeparser.e2ee_helper.signatures.len() <= 0 {
-    if mimeparser.e2ee_helper.signatures.len() <= 0 {
         warn!(mimeparser.context, 0, "Message not signed.",);
-        return false;
+        false
-    }
+    } else if expected_fingerprint.as_ref().is_empty() {
-    if expected_fingerprint.as_ref().is_empty() {
         warn!(mimeparser.context, 0, "Fingerprint for comparison missing.",);
-        return false;
+        false
-    }
+    } else if !mimeparser
-    if !mimeparser
         .e2ee_helper
         .signatures
         .contains(expected_fingerprint.as_ref())
@@ -891,13 +828,13 @@ unsafe fn encrypted_and_signed(
             "Message does not match expected fingerprint {}.",
             expected_fingerprint.as_ref(),
         );
-        return false;
+        false
-    }
+    } else {
-
         true
+    }
 }
 
-pub unsafe fn dc_handle_degrade_event(context: &Context, peerstate: &Peerstate) {
+pub fn dc_handle_degrade_event(context: &Context, peerstate: &Peerstate) {
     // - we do not issue an warning for DC_DE_ENCRYPTION_PAUSED as this is quite normal
     // - currently, we do not issue an extra warning for DC_DE_VERIFICATION_LOST - this always comes
     //   together with DC_DE_FINGERPRINT_CHANGED which is logged, the idea is not to bother

src/location.rs

@@ -220,7 +220,7 @@ pub fn send_locations_to_chat(context: &Context, chat_id: u32, seconds: i64) {
                 msg.text =
                     Some(context.stock_system_msg(StockMessage::MsgLocationEnabled, "", "", 0));
                 msg.param.set_int(Param::Cmd, 8);
-                unsafe { chat::send_msg(context, chat_id, &mut msg).unwrap() };
+                chat::send_msg(context, chat_id, &mut msg).unwrap();
             } else if 0 == seconds && is_sending_locations_before {
                 let stock_str =
                     context.stock_system_msg(StockMessage::MsgLocationDisabled, "", "", 0);
@@ -607,7 +607,7 @@ pub fn job_do_DC_JOB_MAYBE_SEND_LOCATIONS(context: &Context, _job: &Job) {
                             msg.hidden = true;
                             msg.param.set_int(Param::Cmd, 9);
                             // TODO: handle cleanup on error
-                            unsafe { chat::send_msg(context, chat_id as u32, &mut msg).unwrap() };
+                            chat::send_msg(context, chat_id as u32, &mut msg).unwrap();
                         }
                         Ok(())
                     },