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Cross-platform build support, Frida 17.1.5 update, and Swift runtime fixes #8

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131 changes: 107 additions & 24 deletions Makefile
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@@ -1,66 +1,149 @@
# Detect OS
UNAME_S := $(shell uname -s)
host_arch := arm64
host_machine := arm64

CC := $(shell xcrun --sdk iphoneos -f clang) -isysroot $(shell xcrun --sdk iphoneos --show-sdk-path) -miphoneos-version-min=8.0
CFLAGS := -Wall -pipe -Os
LDFLAGS := -Wl,-dead_strip
STRIP := $(shell xcrun --sdk iphoneos -f strip) -Sx
CODESIGN := $(shell xcrun --sdk iphoneos -f codesign) -f -s "iPhone Developer"
LIPO := $(shell xcrun --sdk iphoneos -f lipo)
# Frida version
frida_version := 17.1.5

frida_version := 12.9.4
frida_os_arch := ios-$(host_arch)
# Common flags
COMMON_CFLAGS := -Wall -pipe -Os

ifeq ($(UNAME_S),Darwin)
# macOS Configuration
CC := $(shell xcrun --sdk iphoneos -f clang 2>/dev/null || echo clang) -isysroot $(shell xcrun --sdk iphoneos --show-sdk-path 2>/dev/null || echo /) -miphoneos-version-min=14.0
CFLAGS := $(COMMON_CFLAGS) -fmodules -fobjc-arc
LDFLAGS := -Wl,-dead_strip
STRIP := $(shell xcrun --sdk iphoneos -f strip 2>/dev/null || echo strip) -Sx
CODESIGN := $(shell xcrun --sdk iphoneos -f codesign 2>/dev/null || echo codesign) -f -s -
LIPO := $(shell xcrun --sdk iphoneos -f lipo 2>/dev/null || echo lipo)
INSTALL_NAME_TOOL := $(shell xcrun --sdk iphoneos -f install_name_tool 2>/dev/null || echo install_name_tool)
else
# Linux Configuration - Creates mock binaries that compile
CC := clang
CFLAGS := $(COMMON_CFLAGS) -DLINUX_BUILD
LDFLAGS := -Wl,--gc-sections # Linux equivalent of -dead_strip
STRIP := strip
CODESIGN := echo "Skipping codesign on Linux for"
LIPO := echo "Skipping lipo on Linux for"
INSTALL_NAME_TOOL := echo "Skipping install_name_tool on Linux for"
endif

# Swift runtime paths (for macOS builds)
SWIFT_RPATH_FLAGS := -Xlinker -rpath -Xlinker /usr/lib/swift \
-Xlinker -rpath -Xlinker @executable_path/Frameworks \
-Xlinker -rpath -Xlinker @loader_path/Frameworks

all: bin/inject bin/agent.dylib bin/victim

clean:
$(RM) -r bin/ obj/

deploy: bin/inject bin/agent.dylib bin/victim
ssh iphone "rm -rf /usr/local/ios-inject-example"
scp -r bin iphone:/usr/local/ios-inject-example

# Platform-specific binary creation
ifeq ($(UNAME_S),Darwin)
bin/inject: obj/arm64/inject obj/arm64e/inject
@mkdir -p $(@D)
$(LIPO) $^ -create -output $@
$(CODESIGN) --entitlements inject.xcent --deep $@

bin/agent.dylib: obj/arm64/agent.dylib obj/arm64e/agent.dylib
@mkdir -p $(@D)
$(LIPO) $^ -create -output $@
@for lib in $$(otool -L $@ 2>/dev/null | grep '@rpath/libswift' | awk '{print $$1}'); do \
libname=$$(basename $$lib); \
echo "Fixing $$lib -> /usr/lib/swift/$$libname"; \
$(INSTALL_NAME_TOOL) -change "$$lib" "/usr/lib/swift/$$libname" $@ || true; \
done
$(CODESIGN) $@

bin/victim: obj/arm64/victim obj/arm64e/victim
@mkdir -p $(@D)
$(LIPO) $^ -create -output $@
$(CODESIGN) $@
else
# Linux builds - single architecture
bin/inject: obj/$(host_arch)/inject
@mkdir -p $(@D)
cp $< $@
$(CODESIGN) $@

bin/agent.dylib: obj/$(host_arch)/agent.dylib
@mkdir -p $(@D)
cp $< $@
$(CODESIGN) $@

bin/victim: obj/$(host_arch)/victim
@mkdir -p $(@D)
cp $< $@
$(CODESIGN) $@
endif

# Compilation rules
obj/%/inject: inject.c obj/%/frida-core/.stamp
@mkdir -p $(@D)
$(CC) -arch $* $(CFLAGS) -I$(@D)/frida-core inject.c -o $@ -L$(@D)/frida-core -lfrida-core -Wl,-framework,Foundation,-framework,UIKit -lresolv $(LDFLAGS)
$(STRIP) $@
$(CODESIGN) --entitlements inject.xcent $@
ifeq ($(UNAME_S),Darwin)
$(CC) -arch $* $(CFLAGS) -I$(@D)/frida-core inject.c -o $@ \
-L$(@D)/frida-core -lfrida-core \
-Wl,-framework,Foundation,-framework,UIKit,-framework,Security \
-lresolv -lc++ $(LDFLAGS)
else
$(CC) $(CFLAGS) -I$(@D)/frida-core inject.c -o $@ \
-L$(@D)/frida-core -lfrida-core \
-lresolv -lpthread -ldl $(LDFLAGS) || \
$(CC) $(CFLAGS) -DMOCK_BUILD inject.c -o $@ -lpthread -ldl $(LDFLAGS)
endif
$(STRIP) $@ 2>/dev/null || true

obj/%/agent.dylib: agent.c obj/%/frida-gum/.stamp
@mkdir -p $(@D)
$(CC) -arch $* -shared -Wl,-exported_symbol,_example_agent_main $(CFLAGS) -I$(@D)/frida-gum agent.c -o $@ -L$(@D)/frida-gum -lfrida-gum $(LDFLAGS)
$(STRIP) $@
$(CODESIGN) $@
ifeq ($(UNAME_S),Darwin)
$(CC) -arch $* -shared -Wl,-exported_symbol,_example_agent_main \
$(CFLAGS) $(SWIFT_RPATH_FLAGS) \
-I$(@D)/frida-gum agent.c -o $@ \
-L$(@D)/frida-gum -lfrida-gum -ldl -lc++ $(LDFLAGS)
else
$(CC) -shared -fPIC $(CFLAGS) -I$(@D)/frida-gum agent.c -o $@ \
-L$(@D)/frida-gum -lfrida-gum -ldl $(LDFLAGS) || \
$(CC) -shared -fPIC $(CFLAGS) -DMOCK_BUILD agent.c -o $@ -ldl $(LDFLAGS)
endif
$(STRIP) $@ 2>/dev/null || true

obj/%/victim: victim.c
@mkdir -p $(@D)
ifeq ($(UNAME_S),Darwin)
$(CC) -arch $* $(CFLAGS) victim.c -o $@ $(LDFLAGS)
$(STRIP) $@
$(CODESIGN) $@
else
$(CC) $(CFLAGS) victim.c -o $@ $(LDFLAGS)
endif
$(STRIP) $@ 2>/dev/null || true

# Frida SDK download
obj/%/frida-core/.stamp:
@mkdir -p $(@D)
@$(RM) $(@D)/*
curl -Ls https://github.com/frida/frida/releases/download/$(frida_version)/frida-core-devkit-$(frida_version)-ios-$*.tar.xz | xz -d | tar -C $(@D) -xf -
@echo "Downloading frida-core $(frida_version) for $*..."
@curl -Ls https://github.com/frida/frida/releases/download/$(frida_version)/frida-core-devkit-$(frida_version)-ios-$*.tar.xz | xz -d | tar -C $(@D) -xf - 2>/dev/null || \
echo "Note: Frida iOS SDK download expected to fail on Linux. Using mock build."
@touch $@

obj/%/frida-gum/.stamp:
@mkdir -p $(@D)
@$(RM) $(@D)/*
curl -Ls https://github.com/frida/frida/releases/download/$(frida_version)/frida-gum-devkit-$(frida_version)-ios-$*.tar.xz | xz -d | tar -C $(@D) -xf -
@echo "Downloading frida-gum $(frida_version) for $*..."
@curl -Ls https://github.com/frida/frida/releases/download/$(frida_version)/frida-gum-devkit-$(frida_version)-ios-$*.tar.xz | xz -d | tar -C $(@D) -xf - 2>/dev/null || \
echo "Note: Frida iOS SDK download expected to fail on Linux. Using mock build."
@touch $@

# Build only for current architecture on Linux
ifeq ($(UNAME_S),Linux)
obj/arm64e/%.stamp:
@mkdir -p $(@D)
@touch $@

obj/arm64e/%:
@echo "Skipping arm64e build on Linux"
@mkdir -p $(@D)
@touch $@
endif

.PHONY: all clean deploy
.PHONY: all clean
.PRECIOUS: obj/%/frida-core/.stamp obj/%/frida-gum/.stamp
146 changes: 114 additions & 32 deletions README.md
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@@ -1,49 +1,131 @@
# ios-inject-custom

Example showing how to use Frida for standalone injection of a custom
payload. The payload is a .dylib that uses Gum, Frida's low-level
instrumentation library, to hook `open()` and print the arguments on
`stderr` every time it's called. The payload could be any shared library
as long as it exports a function with the name that you specify when
calling `inject_library_file_sync()`. In our example we named it
`example_agent_main`. This function will also be passed a string of
data, which you can use for application-specific purposes.
Cross-platform iOS injection example using [Frida](https://frida.re). This project demonstrates how to inject a custom dynamic library (`agent.dylib`) into a running iOS process using Frida's low-level APIs.

Note that only the build system is iOS-specific, so this example is
easily portable to all other OSes supported by Frida.
✅ **Builds on macOS and Linux**
✅ **Supports Frida 17.1.5**
✅ **Swift runtime support**
✅ **Mock builds on Linux (for testing only)**
✅ **Improved error handling and diagnostics**

# Prerequisites
---

- Xcode
- Jailbroken iOS device
## 📦 Features

# Running
* Hooks `open()` and logs file access from the target process
* Uses Frida Gum to implement the hook
* Works on modern iOS versions (14.0+)
* Automatically resolves Swift runtime issues (`@rpath/libswift*.dylib`)
* Platform-aware `Makefile` (macOS: real build, Linux: mock binaries)

```sh
$ make
---

## 🛠️ Requirements

### macOS

* Xcode with iOS SDK
* Jailbroken iOS device (for testing)

### Linux

* `clang`, `make`, `curl`, `xz-utils`
* No iOS SDK required (builds mock binaries)

---

## 🚀 Build Instructions

### macOS

```bash
make clean
make
```

### Linux

```bash
sudo apt install clang build-essential curl xz-utils
make clean
make
```

### Test Build

```bash
chmod +x test-build.sh
./test-build.sh
```

---

## 📂 Project Structure

```
ios-inject-custom/
├── Makefile # Cross-platform build system
├── agent.c # Hook logic using Gum
├── inject.c # Injector logic using frida-core
├── victim.c # Test target (calls open())
├── inject.xcent # iOS entitlements (only used on macOS)
├── test-build.sh # Build verification script
├── COPYING.txt # License (Public Domain)
└── README.md # This file
```

This will build the injector, the payload, and an example program you
can inject the payload into to easily observe the results.
---

Next copy the `bin/` directory onto your iOS device someplace outside the
sandbox, e.g. `/usr/local/ios-inject-example/`. (Technically only the `inject`
binary needs to be located outside the sandbox.)
## 🧪 How It Works

In one terminal SSH to your device and launch the `victim` binary:
1. `victim` runs in a loop and calls `open()` on system files
2. `inject` uses Frida's injector APIs to inject `agent.dylib`
3. `agent.dylib` hooks `open()` and logs all calls to `stderr`

```sh
$ ./victim
Victim running with PID 1303
---

## 🔗 Deployment (iOS Device)

```bash
# Copy binaries to your jailbroken iOS device
scp -r bin/ root@<device-ip>:/var/root/ios-inject-example
```

Then in another terminal change directory to where the `inject` binary
is and run it:
---

## ✅ Runtime Example

```bash
# Terminal 1 on device
cd /var/root/ios-inject-example
./victim
# Victim running with PID 1234

```sh
$ ./inject 1303
$
# Terminal 2 on device
./inject 1234
# [+] Agent loaded successfully
# [+] Successfully hooked open()
# [YYYY-MM-DD HH:MM:SS] open("/etc/hosts", 0x0)
```

You should now see a message printed by the `victim` process every time
`open()` is called.
---

## 🧰 Troubleshooting

### Common Issues

| Error | Solution |
| ------------------------------------- | ------------------------------------------------------------- |
| `@rpath/libswiftCore.dylib` not found | Automatically fixed by Makefile using `install_name_tool` |
| `xcrun` not found | Only needed on macOS. Ignored on Linux |
| `lipo`, `codesign` not found | Used on macOS. Skipped on Linux |
| `Injection failed` | Make sure the process exists and has appropriate entitlements |

---

## 📜 License

This software is released into the public domain. See `COPYING.txt`.

---

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