ttl because easy

srcs/main.c

@@ -7,17 +7,15 @@ static char doc[] = "Send ICMP ECHO_REQUEST packets to network hosts.\vMandatory
                     "only) are available only to superuser.";
 static char args_doc[] = "HOST ...";
 
+#define ARG_TTL 256
+
 static struct argp_option options[] = {
     {0, 0, 0, 0, "Options valid for all request types:\n"},
     {"verbose", 'v', 0, 0, "verbose output"},
+    {"ttl", ARG_TTL, "N", 0, "specify N as time-to-live"},
     {0},
 };
 
-struct arguments {
-    char* args[1];
-    int verbose;
-};
-
 static error_t parse_opt(int key, char* arg, struct argp_state* state) {
     struct arguments* arguments = state->input;
 
@@ -25,6 +23,8 @@ static error_t parse_opt(int key, char* arg, struct argp_state* state) {
         case 'v':
             arguments->verbose = 1;
             break;
+        case ARG_TTL:
+            arguments->ttl = strtoul(arg, NULL, 10);
         case ARGP_KEY_ARG:
             if (state->arg_num >= 2)
                 argp_usage(state);
@@ -44,42 +44,37 @@ static struct argp argp = {options, parse_opt, args_doc, doc};
 
 static bool stop = false;
 
+int sock = 0;
+
+void send_ping() {}
+
 void sig_handler(int sig) {
     if (sig == SIGINT) {
         stop = true;
     } else if (sig == SIGALRM) {
+        send_ping();
     }
 }
 
 int main(int argc, char** argv) {
     struct arguments arguments;
     arguments.verbose = 0;
+    arguments.ttl = 64;
     argp_parse(&argp, argc, argv, 0, 0, &arguments);
 
-    int sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
+    sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 
     if (sock < 0) {
         dprintf(STDERR_FILENO, "%s: socket() failed: %s\n", argv[0], strerror(errno));
         exit(1);
     }
-    struct sockaddr_in server;
-    bzero(&server, sizeof(server));
 
-    server.sin_family = AF_INET;
-    if (inet_aton(arguments.args[0], &server.sin_addr) < 1) {
-        dprintf(STDERR_FILENO, "%s: unknown host\n", argv[0]);
+    if (setsockopt(sock, IPPROTO_IP, IP_TTL, &arguments.ttl, sizeof(arguments.ttl)) < 0) {
+        dprintf(STDERR_FILENO, "%s: setsockopt() failed: %s\n", argv[0], strerror(errno));
         close(sock);
         exit(1);
     }
-
-    server.sin_port = htons(0);
-
-    if (bind(sock, (struct sockaddr*)&server, sizeof(server)) < 0) {
-        close(sock);
-        dprintf(STDERR_FILENO, "%s: bind() failed: %s\n", argv[0], strerror(errno));
-        exit(1);
-    }
-
+    
     struct sigaction sig_handle;
 
     sig_handle.sa_handler = sig_handler;
@@ -87,6 +82,11 @@ int main(int argc, char** argv) {
     sigaction(SIGINT, &sig_handle, 0);
     sigaction(SIGALRM, &sig_handle, 0);
 
+    // alarm(1);
+
+    unsigned long xmit = 0;
+    unsigned long recv = 0;
+
     while (true) {
 
         if (stop) {
@@ -94,7 +94,8 @@ int main(int argc, char** argv) {
         }
     }
     printf("---- %s ping statistics ----\n", arguments.args[0]);
-    // printf("%d packets transmitted, %d packets received, %d%% packet loss\n");
+    printf("%zu packets transmitted, %zu packets received, %%zu%% packet loss\n", xmit,
+           recv /*, (xmit - recv) / xmit * 100*/);
     // printf("round-trip min/avg/max/stddev = %f/%f/%f/%f ms\n");
     close(sock);
 }

srcs/util.c

@@ -0,0 +1,5 @@
+//
+// Created by jrathelo on 2/24/25.
+//
+
+#include <main.h>