#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <curl/curl.h>
 
// Function to generate a 6-digit OTP
int generateOTP() {
    return (rand() % 900000) + 100000;
}
 
// Function to send the OTP via Twilio API
void sendOTP(const char* otp, const char* to_number, const char* from_number, const char* account_sid, const char* auth_token) {
    CURL *curl;
    CURLcode res;
 
    // Initialize CURL
    curl_global_init(CURL_GLOBAL_DEFAULT);
    curl = curl_easy_init();
 
    if(curl) {
        char url[256];
        sprintf(url, "https://a...content-available-to-author-only...o.com/2010-04-01/Accounts/%s/Messages.json", account_sid);
 
        // Message body
        char data[512];
        sprintf(data, "To=%s&From=%s&Body=Your+OTP+is+%s", to_number, from_number, otp);
 
        // Set up the request
        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
 
        // Set authentication
        char auth[128];
        sprintf(auth, "%s:%s", account_sid, auth_token);
        curl_easy_setopt(curl, CURLOPT_USERPWD, auth);
 
        // Perform the request
        res = curl_easy_perform(curl);
 
        // Check for errors
        if(res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
        else
            printf("OTP sent successfully!\n");
 
        // Cleanup
        curl_easy_cleanup(curl);
    }
    curl_global_cleanup();
}
 
int main() {
    // Seed the random number generator
    srand(time(NULL));
 
    // Generate the OTP
    int otp = generateOTP();
    char otp_str[7];
    sprintf(otp_str, "%d", otp);
 
    // Twilio credentials and numbers
    const char* account_sid = "your_account_sid";
    const char* auth_token = "your_auth_token";
    const char* to_number = "+9145815895";     // Replace with the recipient's number
    const char* from_number = "+9718606781";   // Replace with your Twilio number
 
    // Send the OTP
    sendOTP(otp_str, to_number, from_number, account_sid, auth_token);
 
    return 0;
}

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