Add the files

1 files changed, 168 insertions, 0 deletions

diff --git a/src/detection/lm/lm_linux.c b/src/detection/lm/lm_linux.c
new file mode 100644
index 0000000..140205d
--- /dev/null
+++ b/src/detection/lm/lm_linux.c
@@ -0,0 +1,168 @@
+#include "lm.h"
+#include "common/properties.h"
+#include "common/dbus.h"
+#include "common/processing.h"
+#include "detection/displayserver/displayserver.h"
+
+#include <unistd.h>
+
+#define FF_SYSTEMD_SESSIONS_PATH "/run/systemd/sessions/"
+#define FF_SYSTEMD_USERS_PATH "/run/systemd/users/"
+
+static const char* getGdmVersion(FFstrbuf* version) {
+    const char* error = ffProcessAppendStdOut(version, (char* const[]) { "gdm", "--version", NULL });
+    if (error || version->length == 0) {
+        error = ffProcessAppendStdOut(version, (char* const[]) { "gdm3", "--version", NULL });
+        if (error || version->length == 0) {
+            return "Failed to get GDM version";
+        }
+    }
+
+    // GDM 44.1
+    ffStrbufSubstrAfterFirstC(version, ' ');
+    return NULL;
+}
+
+static const char* getSshdVersion(FFstrbuf* version) {
+    const char* error = ffProcessAppendStdErr(version, (char* const[]) { "sshd", "-V", NULL });
+    if (error) {
+        return error;
+    }
+
+    // OpenSSH_9.0p1, OpenSSL 3.0.9 30 May 2023...
+    ffStrbufSubstrBeforeFirstC(version, ',');
+    ffStrbufSubstrAfterFirstC(version, '_');
+    return NULL;
+}
+
+#ifdef FF_HAVE_ZLIB
+    #include "common/library.h"
+    #include <stdlib.h>
+    #include <zlib.h>
+
+static const char* getSddmVersion(FFstrbuf* version) {
+    FF_LIBRARY_LOAD_MESSAGE(zlib, "libz" FF_LIBRARY_EXTENSION, 2)
+    FF_LIBRARY_LOAD_SYMBOL_MESSAGE(zlib, gzopen)
+    FF_LIBRARY_LOAD_SYMBOL_MESSAGE(zlib, gzread)
+    FF_LIBRARY_LOAD_SYMBOL_MESSAGE(zlib, gzerror)
+    FF_LIBRARY_LOAD_SYMBOL_MESSAGE(zlib, gztell)
+    FF_LIBRARY_LOAD_SYMBOL_MESSAGE(zlib, gzrewind)
+    FF_LIBRARY_LOAD_SYMBOL_MESSAGE(zlib, gzclose)
+
+    gzFile file = ffgzopen(FASTFETCH_TARGET_DIR_USR "/share/man/man1/sddm.1.gz", "rb");
+    if (file == Z_NULL) {
+        return "ffgzopen(\"/usr/share/man/man1/sddm.1.gz\", \"rb\") failed";
+    }
+
+    ffStrbufEnsureFree(version, 2047);
+    memset(version->chars, 0, version->allocated);
+    int size = ffgzread(file, version->chars, version->allocated - 1);
+    ffgzclose(file);
+
+    if (size <= 0) {
+        return "ffgzread(file, version->chars, version->length) failed";
+    }
+
+    version->length = (uint32_t) size;
+    uint32_t index = ffStrbufFirstIndexS(version, ".TH ");
+    if (index == version->length) {
+        ffStrbufClear(version);
+        return ".TH is not found";
+    }
+
+    ffStrbufSubstrBefore(version, ffStrbufNextIndexC(version, index, '\n'));
+    ffStrbufSubstrAfter(version, index + (uint32_t) strlen(".TH "));
+
+    // "SDDM" 1 "May 2014" "sddm 0.20.0" "sddm"
+    ffStrbufSubstrBeforeLastC(version, ' ');
+    ffStrbufTrimRight(version, '"');
+    ffStrbufSubstrAfterLastC(version, ' ');
+
+    return NULL;
+}
+#else
+static const char* getSddmVersion(FF_A_UNUSED FFstrbuf* version) {
+    return "Fastfetch is built without libz support";
+}
+#endif
+
+static const char* getXfwmVersion(FFstrbuf* version) {
+    const char* error = ffProcessAppendStdOut(version, (char* const[]) { "xfwm4", "--version", NULL });
+    if (error) {
+        return error;
+    }
+
+    // This is xfwm4 version 4.18.0 (revision 7e7473c5b) for Xfce 4.18...
+    ffStrbufSubstrAfterFirstS(version, "version ");
+    ffStrbufSubstrBeforeFirstC(version, ' ');
+
+    return NULL;
+}
+
+static const char* getLightdmVersion(FFstrbuf* version) {
+    const char* error = ffProcessAppendStdErr(version, (char* const[]) { "lightdm", "--version", NULL });
+    if (error) {
+        return error;
+    }
+
+    // lightdm 1.30.0
+    ffStrbufSubstrAfterFirstC(version, ' ');
+    ffStrbufTrimRight(version, '\n');
+
+    return NULL;
+}
+
+const char* ffDetectLM(FFLMResult* result) {
+    FF_STRBUF_AUTO_DESTROY path = ffStrbufCreate();
+
+    FF_STRBUF_AUTO_DESTROY sessionId = ffStrbufCreateS(getenv("XDG_SESSION_ID"));
+    if (sessionId.length == 0) {
+        // On some incorrectly configured systems, $XDG_SESSION_ID is not set. Try finding it ourself
+        // WARNING: This is private data. Do not parse
+        ffStrbufSetF(&path, FF_SYSTEMD_USERS_PATH "%d", instance.state.platform.uid);
+
+        // This is actually buggy, and assumes current user is using DE
+        // `sd_pid_get_session` can be a better option, but we need to find a pid to use
+        if (!ffParsePropFileValues(path.chars, 1, (FFpropquery[]) {
+                                                      { "DISPLAY=", &sessionId },
+                                                  })) {
+            return "Failed to get $XDG_SESSION_ID";
+        }
+    }
+
+    ffStrbufSetS(&path, FF_SYSTEMD_SESSIONS_PATH);
+    ffStrbufAppend(&path, &sessionId);
+
+    // WARNING: This is private data. Do not parse
+    if (!ffParsePropFileValues(path.chars, 2, (FFpropquery[]) {
+                                                  { "SERVICE=", &result->service },
+                                                  { "TYPE=", &result->type },
+                                              })) {
+        return "Failed to parse " FF_SYSTEMD_SESSIONS_PATH "$XDG_SESSION_ID";
+    }
+
+    if (instance.config.general.detectVersion) {
+        if (ffStrbufStartsWithS(&result->service, "gdm")) {
+            getGdmVersion(&result->version);
+        } else if (ffStrbufStartsWithS(&result->service, "sddm")) {
+            getSddmVersion(&result->version);
+        } else if (ffStrbufStartsWithS(&result->service, "xfwm")) {
+            getXfwmVersion(&result->version);
+        } else if (ffStrbufStartsWithS(&result->service, "lightdm")) {
+            getLightdmVersion(&result->version);
+        } else if (ffStrbufStartsWithS(&result->service, "sshd")) {
+            getSshdVersion(&result->version);
+        }
+    }
+
+    // Correct char cases
+    if (ffStrbufIgnCaseEqualS(&result->type, FF_WM_PROTOCOL_WAYLAND)) {
+        ffStrbufSetS(&result->type, FF_WM_PROTOCOL_WAYLAND);
+    } else if (ffStrbufIgnCaseEqualS(&result->type, FF_WM_PROTOCOL_X11)) {
+        ffStrbufSetS(&result->type, FF_WM_PROTOCOL_X11);
+    } else if (ffStrbufIgnCaseEqualS(&result->type, FF_WM_PROTOCOL_TTY)) {
+        ffStrbufSetS(&result->type, FF_WM_PROTOCOL_TTY);
+    }
+
+    return NULL;
+}