Actions on start exit

app/src/cli.c

@@ -56,6 +56,7 @@
 #define OPT_OTG                    1036
 #define OPT_NO_CLEANUP             1037
 #define OPT_PRINT_FPS              1038
+#define OPT_HOOK_SCRIPT            1039
 
 struct sc_option {
     char shortopt;
@@ -206,6 +207,18 @@ static const struct sc_option options[] = {
         .longopt = "help",
         .text = "Print this help.",
     },
+    {
+        .longopt_id = OPT_HOOK_SCRIPT,
+        .longopt = "hook-script",
+        .argdesc = "path",
+        .text = "The path to a linux shell script which is run on your device "
+                "when a meaningful event happens.\n"
+                "The script is run with multiple parameters. The ones actually "
+                "used will depend on the event and intended functionality.\n"
+                "In this version, only the events ('START', 'STOP') have been "
+                "implemented. Others may be implemented in the future.\n"
+                "For details on the parameters, check the README manual",
+    },
     {
         .longopt_id = OPT_LEGACY_PASTE,
         .longopt = "legacy-paste",
@@ -1326,6 +1339,47 @@ sc_parse_shortcut_mods(const char *s, struct sc_shortcut_mods *mods) {
 }
 #endif
 
+
+static bool
+parse_hook_script(const char *hook_script_path, char **hook_script) {
+    const int MAX_ACCEPTABLE_SIZE = 1048576; // 1MB
+    if(!hook_script_path) {
+        return false;
+    }
+
+    FILE *script_file = fopen(hook_script_path, "rb");
+    if(script_file == NULL){
+        perror("Cannot open script file\n");
+        return false;
+    }
+    fseek(script_file, 0, SEEK_END);
+    long ssize = ftell(script_file);
+    fseek(script_file, 0, SEEK_SET);
+
+    if(ssize > MAX_ACCEPTABLE_SIZE){
+        LOGE("Script file too large. "
+            "Only up to 1MB (%d bytes) is accepted\n", MAX_ACCEPTABLE_SIZE);
+        return false;
+    }
+
+
+    *hook_script = malloc(ssize + 1);
+    if(*hook_script == NULL){
+        LOG_OOM();
+        return false;
+    }
+    if(!fread(*hook_script, ssize, 1, script_file)){
+        perror("Cannot read script file");
+        return false;
+    }
+    fclose(script_file);
+
+    (*hook_script)[ssize] = '\0';
+
+
+    return true;
+}
+
 static bool
 parse_record_format(const char *optarg, enum sc_record_format *format) {
     if (!strcmp(optarg, "mp4")) {
@@ -1574,6 +1628,11 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
             case OPT_FORWARD_ALL_CLICKS:
                 opts->forward_all_clicks = true;
                 break;
+            case OPT_HOOK_SCRIPT:
+                if (!parse_hook_script(optarg, &opts->hook_script)) {
+                    return false;
+                }
+                break;
             case OPT_LEGACY_PASTE:
                 opts->legacy_paste = true;
                 break;

app/src/options.h

@@ -129,6 +129,7 @@ struct scrcpy_options {
     bool disable_screensaver;
     bool forward_key_repeat;
     bool forward_all_clicks;
+    char * hook_script;
     bool legacy_paste;
     bool power_off_on_close;
     bool clipboard_autosync;

app/src/scrcpy.c

@@ -318,6 +318,7 @@ scrcpy(struct scrcpy_options *options) {
         .codec_options = options->codec_options,
         .encoder_name = options->encoder_name,
         .force_adb_forward = options->force_adb_forward,
+        .hook_script = options->hook_script,
         .power_off_on_close = options->power_off_on_close,
         .clipboard_autosync = options->clipboard_autosync,
         .downsize_on_error = options->downsize_on_error,

app/src/server.c

@@ -93,6 +93,7 @@ sc_server_params_copy(struct sc_server_params *dst,
     COPY(crop);
     COPY(codec_options);
     COPY(encoder_name);
+    COPY(hook_script);
     COPY(tcpip_dst);
 #undef COPY
 
@@ -233,6 +234,23 @@ execute_server(struct sc_server *server,
     if (params->encoder_name) {
         ADD_PARAM("encoder_name=%s", params->encoder_name);
     }
+    if (params->hook_script) {
+        char* requoted_hook;
+        int64_t replace_result = sc_str_find_replace(params->hook_script, "'", "'\"'\"'", &requoted_hook);
+        switch(replace_result){
+            case -2:
+                LOG_OOM();
+                break;
+            case -1:
+            case 0:
+                ADD_PARAM("hook_script='%s'", params->hook_script);
+                break;
+            default:
+                ADD_PARAM("hook_script='%s'", requoted_hook);
+                free(requoted_hook);
+        }
+
+    }
     if (params->power_off_on_close) {
         ADD_PARAM("power_off_on_close=true");
     }

app/src/server.h

@@ -39,6 +39,7 @@ struct sc_server_params {
     bool show_touches;
     bool stay_awake;
     bool force_adb_forward;
+    const char * hook_script;
     bool power_off_on_close;
     bool clipboard_autosync;
     bool downsize_on_error;

app/src/util/str.c

@@ -48,6 +48,76 @@ sc_str_join(char *dst, const char *const tokens[], char sep, size_t n) {
     return n;
 }
 
+int64_t
+sc_str_find_replace(char* input, char* find, char* replace, char** output) {
+
+    uint64_t inputLen;
+    int64_t findLen = strlen(find);
+    int64_t replaceLen = strlen(replace);
+
+    if(findLen < 1){
+        return 0;
+    }
+
+
+    uint64_t first_match = -1;
+    uint32_t matchCount = 0;
+
+    for(inputLen = 0; input[inputLen] != '\0'; inputLen++){
+        // strncmp and not memcmp because it needs to detect null terminating string. Otherwise, it may overrrun.
+        if(input[inputLen] == find[0] && strncmp(&(input[inputLen]), find, findLen) == 0){
+            if(first_match == (uint64_t) -1){
+                first_match = inputLen;
+            }
+            matchCount++;
+        }
+    }
+    printf("matches: %u; \n", matchCount);
+    inputLen++;
+    if(matchCount == 0){
+        return 0;
+    }
+
+    int64_t output_size = inputLen - ( matchCount * (findLen - replaceLen));
+
+    if(output_size <= 0){
+        return -2;
+    }
+
+    // Caller is responsible for freeing this
+    char* output_str = malloc(output_size);
+
+    if(output_str == NULL){
+        printf("inputi: %p\n", output_str);
+        return -2;
+    }
+    *output = output_str;
+
+    memcpy(output_str, input, first_match);
+
+    uint64_t inputi = first_match;
+    uint64_t desti = first_match;
+
+    while (input[inputi] != '\0') {
+        printf("inputi: %lu; %i; %lu; %lu; %s\n", inputi, input[inputi] == find[0], output_size, inputLen, &(input[inputi]));
+        if(input[inputi] == find[0] && strncmp(&(input[inputi]), find, findLen) == 0){
+            memcpy(&(output_str[desti]), replace, replaceLen);
+            // printf("replaced: %s\n", output_str);
+            desti += replaceLen;
+            inputi += findLen;
+        } else {
+            // printf("outputstr: %s\n", output_str);
+            output_str[desti++] = input[inputi++];
+        }
+    }
+
+    output_str[output_size - 1] = '\0';
+
+    return output_size;
+
+}
+
+
 char *
 sc_str_quote(const char *src) {
     size_t len = strlen(src);

app/src/util/str.h

@@ -26,6 +26,27 @@ sc_strncpy(char *dest, const char *src, size_t n);
 size_t
 sc_str_join(char *dst, const char *const tokens[], char sep, size_t n);
 
+/**
+ * String find and replace all occurrences.
+ * Compatible with different sizes of find and the replacement
+ * Only creates output string if changes exist
+ * WARNING: You are responsible for freeing the output if it's not NULL
+ *
+ * @param input The string to find on and replace with matches found
+ * @param find What to find in the input
+ * @param replace What to replace with for each found instance from find
+ * @param output Null or a pointer to the char* which contains the replaced char*
+ * @return int64_t
+ *  if > 0: The size of the string in output
+ *  if < 1: output should be ignored and:
+ *  if == 0: Nothing changed from the original string
+ *  if == -2: Overflow when trying to create the replaced string or OOM
+ *
+ *
+ */
+int64_t
+sc_str_find_replace(char* input, char* find, char* replace, char** output);
+
 /**
  * Quote a string
  *

server/src/main/java/com/genymobile/scrcpy/CleanUp.java

@@ -33,9 +33,9 @@ public Config[] newArray(int size) {
             }
         };
 
-        private static final int FLAG_DISABLE_SHOW_TOUCHES = 1;
-        private static final int FLAG_RESTORE_NORMAL_POWER_MODE = 2;
-        private static final int FLAG_POWER_OFF_SCREEN = 4;
+        private static final int FLAG_DISABLE_SHOW_TOUCHES = 1 << 0;
+        private static final int FLAG_RESTORE_NORMAL_POWER_MODE = 1 << 1;
+        private static final int FLAG_POWER_OFF_SCREEN = 1 << 2;
 
         private int displayId;
 
@@ -46,6 +46,7 @@ public Config[] newArray(int size) {
         private boolean disableShowTouches;
         private boolean restoreNormalPowerMode;
         private boolean powerOffScreen;
+        public String hookScript;
 
         public Config() {
             // Default constructor, the fields are initialized by CleanUp.configure()
@@ -58,6 +59,7 @@ protected Config(Parcel in) {
             disableShowTouches = (options & FLAG_DISABLE_SHOW_TOUCHES) != 0;
             restoreNormalPowerMode = (options & FLAG_RESTORE_NORMAL_POWER_MODE) != 0;
             powerOffScreen = (options & FLAG_POWER_OFF_SCREEN) != 0;
+            hookScript = in.readString();
         }
 
         @Override
@@ -75,6 +77,7 @@ public void writeToParcel(Parcel dest, int flags) {
                 options |= FLAG_POWER_OFF_SCREEN;
             }
             dest.writeByte(options);
+            dest.writeString(hookScript);
         }
 
         private boolean hasWork() {
@@ -116,14 +119,18 @@ private CleanUp() {
         // not instantiable
     }
 
-    public static void configure(int displayId, int restoreStayOn, boolean disableShowTouches, boolean restoreNormalPowerMode, boolean powerOffScreen)
+    public static void configure(
+            int displayId, int restoreStayOn, boolean disableShowTouches, boolean restoreNormalPowerMode, boolean powerOffScreen,
+            String hookScript
+    )
             throws IOException {
         Config config = new Config();
         config.displayId = displayId;
         config.disableShowTouches = disableShowTouches;
         config.restoreStayOn = restoreStayOn;
         config.restoreNormalPowerMode = restoreNormalPowerMode;
         config.powerOffScreen = powerOffScreen;
+        config.hookScript = hookScript == null ? "" : hookScript;
 
         if (config.hasWork()) {
             startProcess(config);
@@ -193,5 +200,15 @@ public static void main(String... args) {
                 Device.setScreenPowerMode(Device.POWER_MODE_NORMAL);
             }
         }
+
+        if (!config.hookScript.isEmpty()) {
+            try {
+                Command.execShellScript(config.hookScript, "stop");
+            } catch (IOException e) {
+                Ln.e("Something failed while trying to run the stop hook", e);
+            } catch (InterruptedException e) {
+                Ln.e("Got interrupted while running the start hook", e);
+            }
+        }
     }
 }

server/src/main/java/com/genymobile/scrcpy/Command.java

@@ -1,7 +1,9 @@
 package com.genymobile.scrcpy;
 
-import java.io.IOException;
+import java.io.*;
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.Scanner;
 
 public final class Command {
@@ -17,6 +19,44 @@ public static void exec(String... cmd) throws IOException, InterruptedException
         }
     }
 
+    public static void execShellScript(String script, String... args) throws IOException, InterruptedException {
+
+        ArrayList<String> cmd = new ArrayList<>();
+        cmd.add("sh");
+        cmd.add("-s");
+        cmd.addAll(Arrays.asList(args));
+
+        Process process = Runtime.getRuntime().exec(cmd.toArray(new String[]{}));
+        BufferedReader err = new BufferedReader(new InputStreamReader(process.getErrorStream()));
+        BufferedReader output = new BufferedReader(new InputStreamReader(process.getInputStream()));
+        BufferedWriter input = new BufferedWriter(new OutputStreamWriter(process.getOutputStream()));
+        input.write(script);
+        input.close();
+
+        StringBuilder fullLines = new StringBuilder();
+        String line;
+        if (Ln.isEnabled(Ln.Level.DEBUG)) {
+            while ((line = output.readLine()) != null) {
+                fullLines.append(line);
+                fullLines.append("\n");
+            }
+            Ln.d("Custom script output:\n---\n" + fullLines + "\n----\n");
+        }
+        fullLines = new StringBuilder();
+        if (Ln.isEnabled(Ln.Level.WARN)) {
+            while ((line = err.readLine()) != null) {
+                fullLines.append(line);
+                fullLines.append("\n");
+            }
+            Ln.w("Custom script err:\n---\n" + fullLines + "\n----\n");
+        }
+
+        int exitCode = process.waitFor();
+        if (exitCode != 0) {
+            throw new IOException("Custom script with args: " + Arrays.toString(args) + " returned with value " + exitCode);
+        }
+    }
+
     public static String execReadLine(String... cmd) throws IOException, InterruptedException {
         String result = null;
         Process process = Runtime.getRuntime().exec(cmd);

server/src/main/java/com/genymobile/scrcpy/Options.java

@@ -18,6 +18,7 @@ public class Options {
     private boolean stayAwake;
     private List<CodecOption> codecOptions;
     private String encoderName;
+    private String hookScript;
     private boolean powerOffScreenOnClose;
     private boolean clipboardAutosync = true;
     private boolean downsizeOnError = true;
@@ -132,6 +133,14 @@ public void setEncoderName(String encoderName) {
         this.encoderName = encoderName;
     }
 
+    public void setHookScript(String hookScript) {
+        this.hookScript = hookScript;
+    }
+
+    public String getHookScript() {
+        return this.hookScript;
+    }
+
     public void setPowerOffScreenOnClose(boolean powerOffScreenOnClose) {
         this.powerOffScreenOnClose = powerOffScreenOnClose;
     }