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@TotallyNotChase
Last active October 24, 2022 02:01
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Native Messaging - C
{
"name": "pingpong",
"description": "Native messaging host example",
"path": "path/to/release_executable",
"type": "stdio",
"allowed_origins": [
"chrome-extension://extension_id/"
]
}
var start;
/*
On a click on the browser action, send the app a message.
*/
chrome.browserAction.onClicked.addListener(() => {
console.log('Sending: ping')
start = performance.now();
chrome.runtime.sendNativeMessage("pingpong", {text: "ping"}, onResponse);
});
function onResponse(res) {
let end = performance.now();
console.log(`Received: ${res.msg}, Took: ${end - start} ms`);
}
{
"name": "Native Messaging Example",
"version": "1.0",
"manifest_version": 2,
"description": "Send a message to a native application.",
"background": {
"scripts": ["main.js"]
},
"browser_action": {
"default_icon": "message.svg"
},
"permissions": [
"nativeMessaging"
]
}
#include<stdio.h>
#include<stdlib.h>
#include<stdint.h>
uint8_t* read_input()
{
uint32_t length;
size_t count;
int err;
count = fread(&length, sizeof(uint32_t), 1, stdin);
if (count != 1)
{
if (feof(stdin))
{
fprintf(stderr, "Unexpectedly encountered EOF while reading file\n");
}
else if ((err = ferror(stdin)))
{
fprintf(stderr, "An error occured while reading file, err code: %d\n", err);
clearerr(stdin);
}
return NULL;
}
uint8_t* value = malloc((length + 1) * sizeof(*value));
if (value == NULL)
{
fprintf(stderr, "An error occured while allocating memory for value");
return NULL;
}
count = fread(value, sizeof(*value), length, stdin);
if (count != length)
{
if (feof(stdin))
{
fprintf(stderr, "Unexpectedly encountered EOF while reading file\n");
}
else if ((err = ferror(stdin)))
{
fprintf(stderr, "An error occured while reading file, err code: %d\n", err);
clearerr(stdin);
}
free(value);
return NULL;
}
return value;
}
size_t write_output(const uint8_t* const value, uint32_t length)
{
size_t count;
int err;
if (length > (1024 * 1024)) {
fprintf(stderr, "Message too large");
return 0;
}
count = fwrite(&length, sizeof(uint32_t), 1, stdout);
if (count != 1)
{
if (feof(stdout))
{
fprintf(stderr, "Unexpectedly encountered EOF while reading file\n");
}
else if ((err = ferror(stdout)))
{
fprintf(stderr, "An error occured while reading file, err code: %d\n", err);
clearerr(stdout);
}
return 0;
}
count = fwrite(value, sizeof(char), length, stdout);
if (count != length)
{
if (feof(stdout))
{
fprintf(stderr, "Unexpectedly encountered EOF while writing file\n");
}
else if ((err = ferror(stdout)))
{
fprintf(stderr, "An error occured while writing file, err code: %d\n", err);
clearerr(stdout);
}
return 0;
}
fflush(stdout);
return length + 4;
}
int main()
{
size_t count;
uint8_t* val = read_input();
if (val == NULL)
{
exit(EXIT_FAILURE);
}
count = write_output((uint8_t*)"{\"msg\":\"pong\"}", 14);
if (count != 18)
{
free(val);
exit(EXIT_FAILURE);
}
free(val);
}
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