Method FindSteamclient

src/platform/linux/vtable_hook.cpp:48–136

}

uintptr_t VtableHook::FindSteamclient(size_t& outSize)
{
    FILE* f = fopen("/proc/self/maps", "r");
    if (!f)
    {
        Log::Error("cannot open /proc/self/maps");
        return 0;
    }

    uintptr_t labeledMin = 0;
    uintptr_t labeledMax = 0;
    g_readableCount = 0;
    g_writableCount = 0;
    char line[512];

    while (fgets(line, sizeof(line), f))
    {
        uintptr_t start_addr, end_addr;
        if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR, &start_addr, &end_addr) < 2)
            continue;
        if (strstr(line, "steamclient.so"))
        {
            if (labeledMin == 0 || start_addr < labeledMin)
                labeledMin = start_addr;
            if (end_addr > labeledMax)
                labeledMax = end_addr;
        }
    }

    if (labeledMin == 0)
    {
        fclose(f);
        Log::Error("steamclient.so not found in /proc/self/maps");
        return 0;
    }

    // Anchor base on ELF magic to correct for labeled-min offset.
    uintptr_t base = FindElfBaseBackward(labeledMin);
    if (base == 0)
    {
        Log::Warn("ELF magic not found backward from labeled steamclient.so start %p, using labeled min",
                  (void*)labeledMin);
        base = labeledMin;
    }
    else if (base != labeledMin)
    {
        Log::Info("corrected steamclient.so base from labeled %p to ELF-magic %p (gap=0x%zx)",
                  (void*)labeledMin, (void*)base, labeledMin - base);
    }

    // Capture readable mappings within +/-16 MiB of labeled span.
    // .data.rel.ro may be in anonymous mappings outside the labeled range.
    // Slot-pointer validation still uses the tight labeled span.
    const uintptr_t adjacency = 16ULL * 1024 * 1024;
    const uintptr_t scanLo = (base > adjacency) ? base - adjacency : 0;
    const uintptr_t scanHi = labeledMax + adjacency;

    rewind(f);