Add UDP sender utility for sending messages to a specified IP address

Author: ydah

bin/udp_sender.c

@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[]) {
+    int sock;
+    struct sockaddr_in addr;
+    ssize_t n;
+
+    if (argc != 3) {
+        printf("Usage: udp_sender <dest_ip> <message>");
+        return 1;
+    }
+
+    char* dest_ip = argv[1];
+    char* message = argv[2];
+
+    sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+    if (sock == -1) {
+        perror("socket");
+        return 1;
+    }
+
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(12345);
+    addr.sin_addr.s_addr = inet_addr(dest_ip);
+
+    n = sendto(sock, message, 5, 0, (struct sockaddr *)&addr, sizeof(addr));
+    if (n < 1) {
+        perror("sendto");
+        return 1;
+    }
+
+    close(sock);
+
+    return 0;
+}