libnx/nx/source/services/sm.c

// Copyright 2017 plutoo
#include "types.h"
#include "result.h"
#include "ipc.h"
#include "services/fatal.h"
#include "services/sm.h"

static Handle g_smHandle = INVALID_HANDLE;

#define MAX_OVERRIDES 32

static struct {
    u64    name;
    Handle handle;
} g_smOverrides[MAX_OVERRIDES];

static size_t g_smOverridesNum = 0;

void smAddOverrideHandle(u64 name, Handle handle)
{
    if (g_smOverridesNum == MAX_OVERRIDES)
        fatalSimple(MAKERESULT(Module_Libnx, LibnxError_TooManyOverrides));

    size_t i = g_smOverridesNum;

    g_smOverrides[i].name   = name;
    g_smOverrides[i].handle = handle;

    g_smOverridesNum++;
}

Handle smGetServiceOverride(u64 name)
{
    size_t i;

    for (i=0; i<g_smOverridesNum; i++)
    {
        if (g_smOverrides[i].name == name)
            return g_smOverrides[i].handle;
    }

    return INVALID_HANDLE;
}

bool smHasInitialized(void) {
    return g_smHandle != INVALID_HANDLE;
}

Result smInitialize(void)
{
    if (smHasInitialized())
        return 0;

    Result rc = svcConnectToNamedPort(&g_smHandle, "sm:");
    Handle tmp;

    if (R_SUCCEEDED(rc) && smGetServiceOriginal(&tmp, smEncodeName("")) == 0x415) {
        IpcCommand c;
        ipcInitialize(&c);
        ipcSendPid(&c);

        struct {
            u64 magic;
            u64 cmd_id;
            u64 zero;
            u64 reserved[2];
        } *raw;

        raw = ipcPrepareHeader(&c, sizeof(*raw));

        raw->magic = SFCI_MAGIC;
        raw->cmd_id = 0;
        raw->zero = 0;

        rc = ipcDispatch(g_smHandle);

        if (R_SUCCEEDED(rc)) {
            IpcParsedCommand r;
            ipcParse(&r);

            struct {
                u64 magic;
                u64 result;
            } *resp = r.Raw;

            rc = resp->result;
        }
    }

    if (R_FAILED(rc))
        smExit();

    return rc;
}

void smExit(void) {
    svcCloseHandle(g_smHandle);
    g_smHandle = INVALID_HANDLE;
}

u64 smEncodeName(const char* name)
{
    u64 name_encoded = 0;
    size_t i;

    for (i=0; i<8; i++)
    {
        if (name[i] == '\0')
            break;

        name_encoded |= ((u64) name[i]) << (8*i);
    }

    return name_encoded;
}

Result smGetService(Service* service_out, const char* name)
{
    u64 name_encoded = smEncodeName(name);
    Handle handle = smGetServiceOverride(name_encoded);
    Result rc;

    if (handle != INVALID_HANDLE)
    {
        service_out->type = ServiceType_Override;
        service_out->handle = handle;
        rc = 0;
    }
    else
    {
        rc = smGetServiceOriginal(&handle, name_encoded);

        if (R_SUCCEEDED(rc))
        {
            service_out->type = ServiceType_Normal;
            service_out->handle = handle;
        }
    }

    return rc;
}

Result smGetServiceOriginal(Handle* handle_out, u64 name)
{
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
        u64 service_name;
        u64 reserved[2];
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 1;
    raw->service_name = name;

    Result rc = ipcDispatch(g_smHandle);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            *handle_out = r.Handles[0];
        }
    }

    return rc;
}

Result smRegisterService(Handle* handle_out, const char* name, bool is_light, int max_sessions) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
        u64 service_name;
        u32 is_light;
        u32 max_sessions;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 2;
    raw->service_name = smEncodeName(name);
    raw->is_light = !!is_light;
    raw->max_sessions = max_sessions;

    Result rc = ipcDispatch(g_smHandle);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            *handle_out = r.Handles[0];
        }
    }

    return rc;
}

Result smUnregisterService(const char* name) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
        u64 service_name;
        u64 reserved;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 3;
    raw->service_name = smEncodeName(name);

    Result rc = ipcDispatch(g_smHandle);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}