ios dproxy is closing connections abruptly and not logging messages from xcode/mac apps #638
Description
Describe the bug
Great work on the project! I was trying out the ios dproxy command to see if I could get a hang of what xcode(version 26) does when we throttle the network condition on the real device. But I don't see any messages related to it and instead the connection with usbmuxd is jiust terminated after tgetting the device plist.
To Reproduce
Steps to reproduce the behavior:
- Make sure ios tunnel is started.
- run ios dporxy --trace --binary --verbose in one terminal
- simulate network throttling from xcode
- after some time stop it and stop the dproxy server as well on the terminal
Expected behavior
I would expect that the communication between the mac (fdrom XCode) with the device woul dbe logged here. I was able to see it in the packet capture to be sure it does happen.
Screenshots
If applicable, add screenshots to help explain your problem.
Desktop (please complete the following information):
- OS: Sequoia
- Browser [e.g. chrome, safari]
- Version 15.6.1
Smartphone (please complete the following information):
- Device: iPhone 16
- OS: iOS
- Browser [e.g. stock browser, safari]
- Version: 18.5
Additional context
Here are the logs for additional context-
ios dproxy --trace --binary --verbose
{"level":"info","msg":"Set Trace mode","time":"2025-10-22T18:44:45+05:30"}
{"level":"debug","msg":"map[--address:\u003cnil\u003e --all:false --app:\u003cnil\u003e --apps:false --arg:[] --basedir:\u003cnil\u003e --binary:true --bundle-id:\u003cnil\u003e --bundleid:\u003cnil\u003e --certfile:\u003cnil\u003e --details:false --dstPath:\u003cnil\u003e --enable-post-restart:false --env:[] --filesharing:false --font:\u003cnil\u003e --force:false --gpxfilepath:\u003cnil\u003e --help:false --iface:\u003cnil\u003e --kill-existing:false --lang:false --lat:\u003cnil\u003e --list:false --locale:false --log-output:\u003cnil\u003e --lon:\u003cnil\u003e --mode:\u003cnil\u003e --nojson:false --orgname:\u003cnil\u003e --output:\u003cnil\u003e --p12file:\u003cnil\u003e --pair-record-path:\u003cnil\u003e --parse:false --password:\u003cnil\u003e --path:\u003cnil\u003e --pid:\u003cnil\u003e --plist:false --port:\u003cnil\u003e --pretty:false --process:\u003cnil\u003e --proxyurl:\u003cnil\u003e --r:false --rsd-port:\u003cnil\u003e --setlang:\u003cnil\u003e --setlocale:\u003cnil\u003e --skip:[] --skip-all:false --srcPath:\u003cnil\u003e --stop-at-entry:false --stream:false --system:false --test-runner-bundle-id:\u003cnil\u003e --test-to-run:[] --test-to-skip:[] --testrunnerbundleid:\u003cnil\u003e --trace:true --tunnel-info-port:\u003cnil\u003e --udid:\u003cnil\u003e --userspace:false --userspace-port:\u003cnil\u003e --verbose:true --version:false --wait:false --xctest:false --xctest-config:\u003cnil\u003e --xctestconfig:\u003cnil\u003e --xctestrun-file-path:\u003cnil\u003e 12h:false 24h:false \u003capp_path\u003e:\u003cnil\u003e \u003cbundleID\u003e:\u003cnil\u003e \u003ccwd\u003e:\u003cnil\u003e \u003chost\u003e:\u003cnil\u003e \u003chostPort\u003e:\u003cnil\u003e \u003ckey\u003e:[] \u003cpass\u003e:\u003cnil\u003e \u003cpattern\u003e:\u003cnil\u003e \u003cport\u003e:\u003cnil\u003e \u003cprofileFile\u003e:\u003cnil\u003e \u003cprofileId\u003e:\u003cnil\u003e \u003cprofileName\u003e:\u003cnil\u003e \u003cprofileTypeId\u003e:\u003cnil\u003e \u003csrcpattern\u003e:\u003cnil\u003e \u003ctarget\u003e:\u003cnil\u003e \u003ctargetPort\u003e:\u003cnil\u003e \u003cuser\u003e:\u003cnil\u003e activate:false add:false apps:false assistivetouch:false auto:false ax:false batterycheck:false batteryregistry:false cp:false crash:false create-cert:false date:false debug:false devicename:false devicestate:false devmode:false diagnostics:false disable:false diskspace:false display:false dproxy:true enable:false erase:false forward:false fsync:false get:false httpproxy:false image:false info:false install:false instruments:false ip:false kill:false lang:false launch:false list:false listen:false lockdown:false ls:false memlimitoff:false mkdir:false mobilegestalt:false mount:false notifications:false pair:false pcap:false prepare:false printskip:false profile:false ps:false pull:false push:false readpair:false reboot:false remove:false resetax:false resetlocation:false rm:false rsd:false runtest:false runwda:false runxctest:false screenshot:false setlocation:false setlocationgpx:false start:false stopagent:false syslog:false sysmontap:false timeformat:false toggle:false tree:false tunnel:false uninstall:false unmount:false version:false voiceover:false zoom:false]","time":"2025-10-22T18:44:45+05:30"}
{"level":"debug","msg":"Looking for device ''","time":"2025-10-22T18:44:45+05:30"}
{"level":"trace","msg":"Opening connection: 0x140008a4200","time":"2025-10-22T18:44:45+05:30"}
{"level":"trace","msg":"UsbMux send ios.ReadDevicesType on 0x140008c8008","time":"2025-10-22T18:44:45+05:30"}
{"level":"trace","msg":"UsbMux Receive on 0x140008c8038","time":"2025-10-22T18:44:45+05:30"}
{"level":"trace","msg":"Closing connection: 0x140008b6040","time":"2025-10-22T18:44:45+05:30"}
{"level":"info","msg":"no udid specified using first device in list","time":"2025-10-22T18:44:45+05:30","udid":"00008140-000515583A.."}
{"level":"debug","msg":"execute handshake","time":"2025-10-22T18:44:46+05:30"}
{"level":"debug","msg":"Looking for device ''","time":"2025-10-22T18:44:46+05:30"}
{"level":"trace","msg":"Opening connection: 0x140008a5840","time":"2025-10-22T18:44:46+05:30"}
{"level":"trace","msg":"UsbMux send ios.ReadDevicesType on 0x14000260ce0","time":"2025-10-22T18:44:46+05:30"}
{"level":"trace","msg":"UsbMux Receive on 0x14000260cf8","time":"2025-10-22T18:44:46+05:30"}
{"level":"trace","msg":"Closing connection: 0x140008b6920","time":"2025-10-22T18:44:46+05:30"}
{"level":"info","msg":"no udid specified using first device in list","time":"2025-10-22T18:44:46+05:30","udid":"00008140-000515583A.."}
TRAC[0000] Opening connection: 0x14000282000
TRAC[0000] UsbMux send ios.ReadDevicesType on 0x14000294008
TRAC[0000] UsbMux Receive on 0x14000294020
TRAC[0000] Closing connection: 0x14000280000
INFO[0000] Lauching proxy in full binary mode
INFO[0000] Moving socket /var/run/usbmuxd to /var/run/usbmuxd.6fed7755-c3f9-42cb-b0c6-cf47e8fd4ec2.real_socket
INFO[0000] connected
INFO[0000] starting tunnel
TRAC[0000] Opening connection: 0x140008a5d90
TRAC[0000] 00000000 4e 03 00 00 01 00 00 00 08 00 00 00 01 00 00 00 |N...............|
00000010 3c 3f 78 6d 6c 20 76 65 72 73 69 6f 6e 3d 22 31 |<?xml version="1|
00000020 2e 30 22 20 65 6e 63 6f 64 69 6e 67 3d 22 55 54 |.0" encoding="UT|
00000030 46 2d 38 22 3f 3e 0a 3c 21 44 4f 43 54 59 50 45 |F-8"?>.<!DOCTYPE|
00000040 20 70 6c 69 73 74 20 50 55 42 4c 49 43 20 22 2d | plist PUBLIC "-|
00000050 2f 2f 41 70 70 6c 65 2f 2f 44 54 44 20 50 4c 49 |//Apple//DTD PLI|
00000060 53 54 20 31 2e 30 2f 2f 45 4e 22 20 22 68 74 74 |ST 1.0//EN" "htt|
00000070 70 3a 2f 2f 77 77 77 2e 61 70 70 6c 65 2e 63 6f |p://www.apple.co|
00000080 6d 2f 44 54 44 73 2f 50 72 6f 70 65 72 74 79 4c |m/DTDs/PropertyL|
00000090 69 73 74 2d 31 2e 30 2e 64 74 64 22 3e 0a 3c 70 |ist-1.0.dtd">.<p|
000000a0 6c 69 73 74 20 76 65 72 73 69 6f 6e 3d 22 31 2e |list version="1.|
000000b0 30 22 3e 0a 3c 64 69 63 74 3e 0a 09 3c 6b 65 79 |0">.<dict>..<key|
000000c0 3e 44 65 76 69 63 65 4c 69 73 74 3c 2f 6b 65 79 |>DeviceList</key|
000000d0 3e 0a 09 3c 61 72 72 61 79 3e 0a 09 09 3c 64 69 |>..<array>...<di|
000000e0 63 74 3e 0a 09 09 09 3c 6b 65 79 3e 44 65 76 69 |ct>....<key>Devi|
000000f0 63 65 49 44 3c 2f 6b 65 79 3e 0a 09 09 09 3c 69 |ceID</key>....<i|
00000100 6e 74 65 67 65 72 3e 31 38 3c 2f 69 6e 74 65 67 |nteger>18</integ|
00000110 65 72 3e 0a 09 09 09 3c 6b 65 79 3e 4d 65 73 73 |er>....<key>Mess|
00000120 61 67 65 54 79 70 65 3c 2f 6b 65 79 3e 0a 09 09 |ageType</key>...|
00000130 09 3c 73 74 72 69 6e 67 3e 41 74 74 61 63 68 65 |.<string>Attache|
00000140 64 3c 2f 73 74 72 69 6e 67 3e 0a 09 09 09 3c 6b |d</string>....<k|
00000150 65 79 3e 50 72 6f 70 65 72 74 69 65 73 3c 2f 6b |ey>Properties</k|
00000160 65 79 3e 0a 09 09 09 3c 64 69 63 74 3e 0a 09 09 |ey>....<dict>...|
00000170 09 09 3c 6b 65 79 3e 43 6f 6e 6e 65 63 74 69 6f |..<key>Connectio|
00000180 6e 53 70 65 65 64 3c 2f 6b 65 79 3e 0a 09 09 09 |nSpeed</key>....|
00000190 09 3c 69 6e 74 65 67 65 72 3e 34 38 30 30 30 30 |.<integer>480000|
000001a0 30 30 30 3c 2f 69 6e 74 65 67 65 72 3e 0a 09 09 |000</integer>...|
000001b0 09 09 3c 6b 65 79 3e 43 6f 6e 6e 65 63 74 69 6f |..<key>Connectio|
000001c0 6e 54 79 70 65 3c 2f 6b 65 79 3e 0a 09 09 09 09 |nType</key>.....|
000001d0 3c 73 74 72 69 6e 67 3e 55 53 42 3c 2f 73 74 72 |<string>USB</str|
000001e0 69 6e 67 3e 0a 09 09 09 09 3c 6b 65 79 3e 44 65 |ing>.....<key>De|
000001f0 76 69 63 65 49 44 3c 2f 6b 65 79 3e 0a 09 09 09 |viceID</key>....|
00000200 09 3c 69 6e 74 65 67 65 72 3e 31 38 3c 2f 69 6e |.<integer>18</in|
00000210 74 65 67 65 72 3e 0a 09 09 09 09 3c 6b 65 79 3e |teger>.....<key>|
00000220 4c 6f 63 61 74 69 6f 6e 49 44 3c 2f 6b 65 79 3e |LocationID</key>|
00000230 0a 09 09 09 09 3c 69 6e 74 65 67 65 72 3e 31 37 |.....<integer>17|
00000240 38 32 35 37 39 32 3c 2f 69 6e 74 65 67 65 72 3e |825792</integer>|
00000250 0a 09 09 09 09 3c 6b 65 79 3e 50 72 6f 64 75 63 |.....<key>Produc|
00000260 74 49 44 3c 2f 6b 65 79 3e 0a 09 09 09 09 3c 69 |tID</key>.....<i|
00000270 6e 74 65 67 65 72 3e 34 37 37 36 3c 2f 69 6e 74 |nteger>4776</int|
00000280 65 67 65 72 3e 0a 09 09 09 09 3c 6b 65 79 3e 53 |eger>.....<key>S|
00000290 65 72 69 61 6c 4e 75 6d 62 65 72 3c 2f 6b 65 79 |erialNumber</key|
000002a0 3e 0a 09 09 09 09 3c 73 74 72 69 6e 67 3e 30 30 |>.....<string>00|
000002b0 30 30 38 31 34 30 2d 30 30 30 35 31 35 35 38 33 |008140-000..|
000002c0 41 35 33 38 30 31 43 3c 2f 73 74 72 69 6e 67 3e |A5..</string>|
000002d0 0a 09 09 09 09 3c 6b 65 79 3e 55 53 42 53 65 72 |.....<key>USBSer|
000002e0 69 61 6c 4e 75 6d 62 65 72 3c 2f 6b 65 79 3e 0a |ialNumber</key>.|
000002f0 09 09 09 09 3c 73 74 72 69 6e 67 3e 30 30 30 30 |....<string>0000|
00000300 38 31 34 30 30 30 30 35 31 35 35 38 33 41 35 33 |8140000515583..|
00000310 38 30 31 43 3c 2f 73 74 72 69 6e 67 3e 0a 09 09 |..</string>...|
00000320 09 3c 2f 64 69 63 74 3e 0a 09 09 3c 2f 64 69 63 |.</dict>...</dic|
00000330 74 3e 0a 09 3c 2f 61 72 72 61 79 3e 0a 3c 2f 64 |t>..</array>.</d|
00000340 69 63 74 3e 0a 3c 2f 70 6c 69 73 74 3e 0a |ict>.</plist>.| direction=device2host id="#1"
ERRO[0000] Failed readmessage bin unix sock error=EOF
TRAC[0000] Closing connection: 0x140008b7260
TRAC[0000] Closing connection: 0x140008b71c0
ERRO[0000] Failed binToDevice.ReadMessage b: 0 error="read unix ->/var/run/usbmuxd: use of closed network connection"
TRAC[0000] Connection closed id="#1"
INFO[0000] done
TRAC[0000] Closing connection: 0x140008b7260
TRAC[0000] Closing connection: 0x140008b71c0
ERRO[0000] Failed reading bytes read unix ->/var/run/usbmuxd: use of closed network connection id="#1"
INFO[0000] done
INFO[0001] connected
INFO[0001] starting tunnel
TRAC[0001] Opening connection: 0x14000316130
TRAC[0001] 00000000 4e 03 00 00 01 00 00 00 08 00 00 00 01 00 00 00 |N...............|
00000010 3c 3f 78 6d 6c 20 76 65 72 73 69 6f 6e 3d 22 31 |<?xml version="1|
And the logs just continue with the same error-
ERRO[0000] Failed readmessage bin unix sock error=EOF
TRAC[0000] Closing connection: 0x140008b7260
TRAC[0000] Closing connection: 0x140008b71c0
ERRO[0000] Failed binToDevice.ReadMessage b: 0 error="read unix ->/var/run/usbmuxd: use of closed network connection"
Can someone please help out? Is this a bug or am I missing out on some configuration/permissions? @danielpaulus - would be helpful if you could suggest some workarounds! Thanks!