James Magahern
7fe2701272
git-subtree-dir: server git-subtree-mainline:6a4054c15agit-subtree-split:800090542d
76 lines
2.4 KiB
Objective-C
76 lines
2.4 KiB
Objective-C
//
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// hooking.c
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// kordophoned
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//
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// Created by James Magahern on 11/13/18.
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// Copyright © 2018 James Magahern. All rights reserved.
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//
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#include "hooking.h"
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#include <stdlib.h>
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#include <dlfcn.h>
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#include <unistd.h>
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BOOL HookIMAgent(const char *relativeDylibPath, char **errorString)
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{
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MBIMLogInfo(@"Hooking imagent");
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const char *hookDylibPath = realpath(relativeDylibPath, NULL);
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// See if file is there.
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int succ = access(hookDylibPath, R_OK);
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if (succ != 0) {
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*errorString = "Unable to access hook dylib. Does file exist?";
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return NO;
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}
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// Make sure we can load the dylib (filters out codesigning issues)
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void *handle = dlopen(hookDylibPath, RTLD_NOW);
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if (!handle) {
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*errorString = dlerror();
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return NO;
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}
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/*********
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***********
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PROBABLY DON'T DO THIS
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If other processes start and load agentHook, then they will crash because dyld tries to
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interpose a function that doesn't exist.
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A better way (maybe put this in a script or something):
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( But launchctl debug needs to run as root :( )
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$ launchctl debug gui/501/com.apple.imagent --environment DYLD_INSERT_LIBRARIES=(path to libagentHook.dylib)
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$ launchctl kill SIGKILL gui/501/com.apple.imagent
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// then let it restart...
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**/
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// Set launchd DYLD_INSERT_LIBRARIES environment variable
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const char *systemCommandFormatString = "/bin/launchctl setenv DYLD_INSERT_LIBRARIES %s";
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size_t bufferSize = strlen(systemCommandFormatString) + strlen(hookDylibPath) + 2;
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char *systemCommand = (char *)malloc(sizeof(char) * bufferSize);
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sprintf(systemCommand, "/bin/launchctl setenv DYLD_INSERT_LIBRARIES %s", hookDylibPath);
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int setEnvSucc = system(systemCommand);
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if (setEnvSucc != 0) {
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*errorString = "Unable to set launchd environment variable.";
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return NO;
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}
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MBIMLogInfo(@"Successfully setup environment variables");
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// Kill imagent so the new one has the loaded bundle
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MBIMLogInfo(@"Killing imagent...");
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int killAgentSuccess = system("killall imagent");
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
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system("/bin/launchctl unsetenv DYLD_INSERT_LIBRARIES");
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});
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return (killAgentSuccess == 0);
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}
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