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https://github.com/hyprwm/Hyprland
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plugins: Add an API entry for finding functions by name
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2 changed files with 87 additions and 0 deletions
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@ -3,6 +3,10 @@
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#include "../debug/HyprCtl.hpp"
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#include <dlfcn.h>
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#if defined(__DragonFly__) || defined(__FreeBSD__) || defined(__NetBSD__)
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#include <sys/sysctl.h>
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#endif
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APICALL bool HyprlandAPI::registerCallbackStatic(HANDLE handle, const std::string& event, HOOK_CALLBACK_FN* fn) {
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auto* const PLUGIN = g_pPluginSystem->getPluginByHandle(handle);
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@ -240,4 +244,72 @@ APICALL bool addNotificationV2(HANDLE handle, const std::unordered_map<std::stri
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}
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return true;
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}
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APICALL std::vector<SFunctionMatch> HyprlandAPI::findFunctionsByName(HANDLE handle, const std::string& name) {
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auto* const PLUGIN = g_pPluginSystem->getPluginByHandle(handle);
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if (!PLUGIN)
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return std::vector<SFunctionMatch>{};
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#if defined(KERN_PROC_PATHNAME)
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int mib[] = {
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CTL_KERN,
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#if defined(__NetBSD__)
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KERN_PROC_ARGS,
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-1,
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KERN_PROC_PATHNAME,
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#else
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KERN_PROC,
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KERN_PROC_PATHNAME,
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-1,
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#endif
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};
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u_int miblen = sizeof(mib) / sizeof(mib[0]);
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char exe[PATH_MAX] = "";
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size_t sz = sizeof(exe);
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sysctl(mib, miblen, &exe, &sz, NULL, 0);
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const auto FPATH = std::filesystem::canonical(exe);
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#elif defined(__OpenBSD__)
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// Neither KERN_PROC_PATHNAME nor /proc are supported
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const auto FPATH = std::filesystem::canonical("/usr/local/bin/Hyprland");
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#else
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const auto FPATH = std::filesystem::canonical("/proc/self/exe");
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#endif
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const auto SYMBOLS = execAndGet(("nm -D -j " + FPATH.string()).c_str());
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const auto SYMBOLSDEMANGLED = execAndGet(("nm -D -j --demangle=auto " + FPATH.string()).c_str());
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auto demangledFromID = [&](size_t id) -> std::string {
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size_t pos = 0;
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size_t count = 0;
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while (count < id) {
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pos++;
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pos = SYMBOLSDEMANGLED.find('\n', pos);
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if (pos == std::string::npos)
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return "";
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count++;
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}
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return SYMBOLSDEMANGLED.substr(pos, SYMBOLSDEMANGLED.find('\n', pos + 1) - pos);
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};
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std::vector<SFunctionMatch> matches;
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std::istringstream inStream(SYMBOLS);
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std::string line;
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int lineNo = 0;
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while (std::getline(inStream, line)) {
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if (line.contains(name)) {
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void* address = dlsym(nullptr, line.c_str());
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if (!address)
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continue;
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matches.push_back({address, line, demangledFromID(lineNo)});
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}
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lineNo++;
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}
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return matches;
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}
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@ -33,6 +33,12 @@ typedef struct {
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std::string version;
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} PLUGIN_DESCRIPTION_INFO;
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struct SFunctionMatch {
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void* address = nullptr;
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std::string signature;
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std::string demangled;
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};
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#define APICALL extern "C"
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#define EXPORT __attribute__((visibility("default")))
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#define REQUIRED
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@ -230,4 +236,13 @@ namespace HyprlandAPI {
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returns: true on success. False otherwise.
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*/
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APICALL bool addNotificationV2(HANDLE handle, const std::unordered_map<std::string, std::any>& data);
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/*
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Returns a vector of found functions matching the provided name.
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These addresses will not change, and should be made static. Lookups are slow.
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Empty means either none found or handle was invalid
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*/
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APICALL std::vector<SFunctionMatch> findFunctionsByName(HANDLE handle, const std::string& name);
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};
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