commit 36a71e51b9fc38793366a70264864d43771c5b81 Author: Alexander Zhirov Date: Thu Dec 21 00:18:00 2023 +0300 init mportlink diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..c745919 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +bin +build diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json new file mode 100644 index 0000000..7ab6f9c --- /dev/null +++ b/.vscode/c_cpp_properties.json @@ -0,0 +1,15 @@ +{ + "configurations": [ + { + "name": "headers", + "includePath": [ + "${workspaceFolder}/**", + "/usr/include/libmm-glib", + "/usr/include/glib-2.0", + "/usr/include/ModemManager", + "/usr/include/sys" + ] + } + ], + "version": 4 +} \ No newline at end of file diff --git a/.vscode/launch.json b/.vscode/launch.json new file mode 100644 index 0000000..b94540e --- /dev/null +++ b/.vscode/launch.json @@ -0,0 +1,15 @@ +{ + "version": "0.2.0", + "configurations": [ + { + "name": "mportlink launch", + "type": "cppdbg", + "request": "launch", + "preLaunchTask": "build", + "program": "${workspaceFolder}/bin/mportlink", + "args": [ + ], + "cwd": "${workspaceFolder}" + } + ] +} diff --git a/.vscode/settings.json b/.vscode/settings.json new file mode 100644 index 0000000..4a03d14 --- /dev/null +++ b/.vscode/settings.json @@ -0,0 +1,24 @@ +{ + "files.associations": { + "cstdlib": "c", + "mm-linker.h": "c", + "mm.h": "c", + "syslog.h": "c", + "libmm-glib.h": "c", + "typeinfo": "c", + "bit": "c", + "cmath": "c", + "compare": "c", + "concepts": "c", + "cstdarg": "c", + "cstdio": "c", + "type_traits": "c", + "limits": "c", + "new": "c", + "*.tcc": "c", + "cstdint": "c", + "fcntl.h": "c", + "file.h": "c" + }, + "cmake.configureOnOpen": false +} \ No newline at end of file diff --git a/.vscode/tasks.json b/.vscode/tasks.json new file mode 100644 index 0000000..f271081 --- /dev/null +++ b/.vscode/tasks.json @@ -0,0 +1,28 @@ +{ + "tasks": [ + { + "type": "cppbuild", + "label": "build", + "command": "/usr/bin/gcc", + "args": [ + "-fdiagnostics-color=always", + "-g", + "*.c", + "`pkg-config", "--libs", "--cflags", "mm-glib`", + "-o", + "${workspaceFolder}/bin/mportlink" + ], + "options": { + "cwd": "${fileDirname}" + }, + "problemMatcher": [ + "$gcc" + ], + "group": { + "kind": "build", + "isDefault": true + } + } + ], + "version": "2.0.0" +} diff --git a/CHANGELOG.md b/CHANGELOG.md new file mode 100644 index 0000000..cfa73e0 --- /dev/null +++ b/CHANGELOG.md @@ -0,0 +1,3 @@ +# Changelog + +## [x.x.x] - unreleased diff --git a/CMakeLists.txt b/CMakeLists.txt new file mode 100644 index 0000000..52b53fd --- /dev/null +++ b/CMakeLists.txt @@ -0,0 +1,15 @@ +cmake_minimum_required(VERSION 3.18.4) +project(mportlink) + +file(GLOB_RECURSE SRC_FILES_LIST src/*.c) + +find_package(PkgConfig REQUIRED) + +pkg_search_module(MM REQUIRED mm-glib) + +include_directories(${MM_INCLUDE_DIRS}) +link_directories(${MM_LIBRARY_DIRS}) +add_definitions(${MM_CFLAGS_OTHER}) + +add_executable(${PROJECT_NAME} ${SRC_FILES_LIST}) +target_link_libraries(${PROJECT_NAME} ${MM_LIBRARIES}) diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/README.md b/README.md new file mode 100644 index 0000000..0d87ba8 --- /dev/null +++ b/README.md @@ -0,0 +1,23 @@ +# MPortLink + +**MPortLink** (*modem port link*) is designed to track connected USB modems and create permanent symbolic links to ports. + +MPortLink was developed for direct use of several USB modems when connected to Asterisk telephony, the ports of which were randomly determined by the operating system. The utility allows you to create permanent symbolic links to devices, regardless of the order in which the ports of the USB modem device were defined. + +Based on [ModemManager](https://gitlab.freedesktop.org/mobile-broadband/ModemManager). + +## Dependency + +The installed `modemmanager` is required for use. + +## Build + +`libmm-glib` library is required for the build. It is called differently in different distributions, for example: `libmm-glib-dev` or `libmm-glib-devel`. + +After installing the dependencies, you just need to run the script `build.sh `and `mportlink` will be built in the `build` project directory. + +### Manually + +``` +gcc -Werror -Wall -Os src/*.c `pkg-config --libs --cflags mm-glib` -o mportlink +``` diff --git a/build.sh b/build.sh new file mode 100755 index 0000000..f6186df --- /dev/null +++ b/build.sh @@ -0,0 +1,8 @@ +#!/bin/sh + +CMAKE="$(which cmake)" +MAKE="$(which make)" +CURRENT_PATH="$(dirname $(realpath ${0}))" + +${CMAKE} -S "${CURRENT_PATH}" -B "${CURRENT_PATH}/build" +${MAKE} -C "${CURRENT_PATH}/build" diff --git a/services/mportlink.service b/services/mportlink.service new file mode 100644 index 0000000..3f864ab --- /dev/null +++ b/services/mportlink.service @@ -0,0 +1,18 @@ +[Unit] +Description=Modem Port Link +After=polkit.service +Requires=polkit.service + +[Service] +ExecStart=/usr/bin/mportlink +Restart=on-abort +CapabilityBoundingSet=CAP_SYS_ADMIN CAP_NET_ADMIN +ProtectSystem=true +ProtectHome=true +PrivateTmp=true +RestrictAddressFamilies=AF_NETLINK AF_UNIX AF_QIPCRTR +NoNewPrivileges=true +User=root + +[Install] +WantedBy=multi-user.target diff --git a/src/mm.c b/src/mm.c new file mode 100644 index 0000000..d2629fd --- /dev/null +++ b/src/mm.c @@ -0,0 +1,41 @@ +#include "mportlink.h" + +MMManager *mmcli_get_manager_finish(GAsyncResult *res) +{ + return g_task_propagate_pointer(G_TASK(res), NULL); +} + +void manager_new_ready(GDBusConnection *connection, GAsyncResult *res, GTask *task) +{ + MMManager *manager; + gchar *name_owner; + GError *error = NULL; + + manager = mm_manager_new_finish(res, &error); + if (!manager) + { + syslog(LOG_ERR, "manager_new_ready, manager: couldn't create manager: %s\n", error ? error->message : "unknown error"); + exit(EXIT_FAILURE); + } + + name_owner = g_dbus_object_manager_client_get_name_owner(G_DBUS_OBJECT_MANAGER_CLIENT(manager)); + if (!name_owner) + { + syslog(LOG_ERR, "manager_new_ready, name_owner: couldn't find the ModemManager process in the bus"); + exit(EXIT_FAILURE); + } + + g_free(name_owner); + + g_task_return_pointer(task, manager, g_object_unref); + g_object_unref(task); +} + +void mmcli_get_manager(GDBusConnection *connection, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) +{ + GTask *task; + + task = g_task_new(connection, cancellable, callback, user_data); + + mm_manager_new(connection, G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_DO_NOT_AUTO_START, cancellable, (GAsyncReadyCallback)manager_new_ready, task); +} diff --git a/src/mm.h b/src/mm.h new file mode 100644 index 0000000..19a61eb --- /dev/null +++ b/src/mm.h @@ -0,0 +1,11 @@ +#include +#include + +typedef struct +{ + MMManager *manager; + GCancellable *cancellable; +} Context; + +MMManager *mmcli_get_manager_finish(GAsyncResult *res); +void mmcli_get_manager(GDBusConnection *connection, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data); diff --git a/src/mportlink-core.c b/src/mportlink-core.c new file mode 100644 index 0000000..e89403d --- /dev/null +++ b/src/mportlink-core.c @@ -0,0 +1,233 @@ +#include "mportlink.h" +#include +#include +#include +#include + +#define DEV_PATH "/dev/" + +typedef struct +{ + const gchar *manufacturer; + const gchar *model; + const gchar *imei; + const gchar *device_identifier; + MMModemPortInfo *ports; + guint n_ports; +} MPLmodem; + +MPLmodem *mpl_get_new_modem() +{ + MPLmodem *modem = (MPLmodem *)calloc(1, sizeof(MPLmodem)); + + if (modem == NULL) + { + syslog(LOG_ERR, "mpl_get_new_modem, modem: memory allocation error"); + raise(SIGINT); + } + + return modem; +} + +void mpl_free_modem(MPLmodem *modem) +{ + if (modem->n_ports && modem->ports) + mm_modem_port_info_array_free(modem->ports, modem->n_ports); + free(modem); +} + +void mpl_print_modem_info(MPLmodem *modem, bool connected) +{ + gchar *status; + status = connected ? "Connected" : "Disconnected"; + + g_print("%s %s %s (%s)\n", status, modem->manufacturer, modem->model, modem->device_identifier); + g_print("`-- Count ports: %d\n", modem->n_ports); + + for (guint i = 0; i < modem->n_ports; i++) + { + if (i + 1 < modem->n_ports) + { + g_print(" |-- Port %d:\n", i); + g_print(" | |-- Name: %s\n", modem->ports[i].name); + g_print(" | `-- Link: %s-%d\n", modem->imei, i); + } + else + { + g_print(" `-- Port %d:\n", i); + g_print(" |-- Name: %s\n", modem->ports[i].name); + g_print(" `-- Link: %s-%d\n", modem->imei, i); + } + } +} + +MPLmodem *mpl_get_new_modem_info(MMObject *obj) +{ + MPLmodem *mpl_modem = NULL; + MMModem *mm_modem = mm_object_get_modem(obj); + + if (mm_modem == NULL) + { + syslog(LOG_ERR, "mpl_get_new_modem_info, mm_modem: modem does not implement the interface"); + return NULL; + } + + mpl_modem = mpl_get_new_modem(); + + mpl_modem->manufacturer = mm_modem_get_manufacturer(mm_modem); + mpl_modem->model = mm_modem_get_model(mm_modem); + mpl_modem->imei = mm_modem_get_equipment_identifier(mm_modem); + mpl_modem->device_identifier = mm_modem_get_device_identifier(mm_modem); + + gboolean success = mm_modem_get_ports(mm_modem, &mpl_modem->ports, &mpl_modem->n_ports); + + g_object_unref(mm_modem); + + if (success) + return mpl_modem; + else + syslog(LOG_WARNING, "mpl_get_new_modem_info, success: error receiving modem ports"); + + mpl_free_modem(mpl_modem); + + return NULL; +} + +char *mpl_get_dst_path(guint index, const gchar *imei) +{ + char *dst_path = NULL; + + guint size_id = snprintf(NULL, 0, "-%d", index); + char *id = (char *)calloc(size_id + 1, sizeof(char)); + + if (id == NULL) + { + syslog(LOG_ERR, "mpl_get_dst_path, id: memory allocation error"); + raise(SIGINT); + } + + sprintf(id, "-%d", index); + + guint dst_path_size = strlen(DEV_PATH) + strlen(imei) + size_id; + dst_path = (char *)calloc(dst_path_size + 1, sizeof(char)); + + if (dst_path == NULL) + { + syslog(LOG_ERR, "mpl_get_dst_path, dst_path: memory allocation error"); + raise(SIGINT); + } + + strcpy(dst_path, DEV_PATH); + strcat(dst_path, imei); + strcat(dst_path, id); + + free(id); + + return dst_path; +} + +char *mpl_get_src_path(const gchar *port_name) +{ + char *src_path = NULL; + + guint src_path_size = strlen(DEV_PATH) + strlen(port_name); + src_path = (char *)calloc(src_path_size + 1, sizeof(char)); + + if (src_path == NULL) + { + syslog(LOG_ERR, "mpl_get_src_path, src_path: memory allocation error"); + raise(SIGINT); + } + + strcpy(src_path, DEV_PATH); + strcat(src_path, port_name); + + return src_path; +} + +void mpl_symlink_ports(MPLmodem *modem) +{ + for (guint i = 0; i < modem->n_ports; i++) + { + char *src_path = mpl_get_src_path(modem->ports[i].name); + char *dst_path = mpl_get_dst_path(i, modem->imei); + struct stat st; + + if (access(src_path, F_OK) == -1) + { + syslog(LOG_ERR, "mpl_symlink_ports, src_path: device file is not available [%s]", src_path); + free(src_path); + free(dst_path); + continue; + } + + if (lstat(dst_path, &st) == 0) + { + syslog(LOG_WARNING, "mpl_symlink_ports, dst_path: a symbolic link to the device already exists [%s]", dst_path); + if (unlink(dst_path) == -1) + { + syslog(LOG_ERR, "mpl_symlink_ports, dst_path: link could not be deleted [%s]", dst_path); + free(src_path); + free(dst_path); + continue; + } + } + + if (symlink(src_path, dst_path) == 0) + syslog(LOG_NOTICE, "mpl_symlink_ports, dst_path: the symbolic link has been successfully created [%s -> %s]", dst_path, src_path); + else + syslog(LOG_ERR, "mpl_symlink_ports, dst_path: error creating a symbolic link [%s -> %s]", dst_path, src_path); + + free(src_path); + free(dst_path); + } +} + +void mpl_unlink_ports(MPLmodem *modem) +{ + for (guint i = 0; i < modem->n_ports; i++) + { + char *dst_path = mpl_get_dst_path(i, modem->imei); + struct stat st; + + if (lstat(dst_path, &st) == -1) + { + syslog(LOG_WARNING, "mpl_unlink_ports, dst_path: a symbolic link to the device not exists [%s]", dst_path); + free(dst_path); + continue; + } + + if (unlink(dst_path) == 0) + syslog(LOG_NOTICE, "mpl_unlink_ports, dst_path: link was successfully deleted [%s]", dst_path); + else + syslog(LOG_ERR, "mpl_unlink_ports, dst_path: link could not be deleted [%s]", dst_path); + + free(dst_path); + } +} + +void mpl_device_added(MMManager *manager, MMObject *obj) +{ + MPLmodem *modem = mpl_get_new_modem_info(obj); + + if (modem == NULL) + return; + + // mpl_print_modem_info(modem, true); + mpl_symlink_ports(modem); + + mpl_free_modem(modem); +} + +void mpl_device_removed(MMManager *manager, MMObject *obj) +{ + MPLmodem *modem = mpl_get_new_modem_info(obj); + + if (modem == NULL) + return; + + // mpl_print_modem_info(modem, false); + mpl_unlink_ports(modem); + + mpl_free_modem(modem); +} diff --git a/src/mportlink.c b/src/mportlink.c new file mode 100644 index 0000000..8625822 --- /dev/null +++ b/src/mportlink.c @@ -0,0 +1,88 @@ +#include "mportlink.h" +#include +#include + +#define LOCKFILE "/run/lock/mportlink.lock" +#define MPL "mportlink" + +static Context *ctx; +static GCancellable *cancellable; +static GMainLoop *loop; + +static void signals_handler(int signum) +{ + if (cancellable) + { + if (!g_cancellable_is_cancelled(cancellable)) + { + syslog(LOG_WARNING, "signals_handler: cancelling the operation..."); + g_cancellable_cancel(cancellable); + } + } + + if (loop && g_main_loop_is_running(loop)) + { + syslog(LOG_WARNING, "signals_handler: cancelling the main loop..."); + g_main_loop_quit(loop); + } +} + +static void get_manager_ready(GObject *source, GAsyncResult *result, gpointer none) +{ + ctx->manager = mmcli_get_manager_finish(result); + + g_signal_connect(ctx->manager, "object-added", G_CALLBACK(mpl_device_added), NULL); + g_signal_connect(ctx->manager, "object-removed", G_CALLBACK(mpl_device_removed), NULL); +} + +int main() +{ + openlog(MPL, LOG_PID, LOG_SYSLOG); + + int lock_fd = open(LOCKFILE, O_CREAT | O_RDWR, 0666); + int rc = flock(lock_fd, LOCK_EX | LOCK_NB); + + if (rc || errno == EWOULDBLOCK) + { + syslog(LOG_ERR, "main: only one instance of %s is allowed", MPL); + exit(EXIT_FAILURE); + } + + syslog(LOG_NOTICE, "main: starting the %s daemon", MPL); + + GError *error = NULL; + GDBusConnection *connection = NULL; + + signal(SIGINT, signals_handler); + signal(SIGHUP, signals_handler); + signal(SIGTERM, signals_handler); + + connection = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error); + if (!connection) + { + syslog(LOG_ERR, "main, connection: couldn't get bus: %s", error->message); + exit(EXIT_FAILURE); + } + + cancellable = g_cancellable_new(); + loop = g_main_loop_new(NULL, FALSE); + + ctx = g_new0(Context, 1); + if (cancellable) + ctx->cancellable = g_object_ref(cancellable); + + mmcli_get_manager(connection, cancellable, (GAsyncReadyCallback)get_manager_ready, NULL); + g_main_loop_run(loop); + + if (cancellable) + g_object_unref(cancellable); + g_main_loop_unref(loop); + g_object_unref(connection); + + flock(lock_fd, LOCK_UN); + + syslog(LOG_NOTICE, "main: stopping the %s daemon", MPL); + closelog(); + + return EXIT_SUCCESS; +} diff --git a/src/mportlink.h b/src/mportlink.h new file mode 100644 index 0000000..6e7358e --- /dev/null +++ b/src/mportlink.h @@ -0,0 +1,4 @@ +#include "mm.h" + +void mpl_device_added(MMManager *manager, MMObject *obj); +void mpl_device_removed(MMManager *manager, MMObject *obj);