Network commands port to userspace

src/kernel/userland/ping.c

@@ -0,0 +1,73 @@
+#include <stdlib.h>
+#include <syscall.h>
+
+int main(int argc, char **argv) {
+    if (argc < 2) {
+        printf("Usage: ping a.b.c.d\n");
+        return 1;
+    }
+    
+    if (!sys_network_is_initialized()) {
+        printf("Error: Network not initialized. Run 'net init' first.\n");
+        return 1;
+    }
+    
+    const char *args = argv[1];
+    
+    net_ipv4_address_t ip = {{0, 0, 0, 0}};
+    int idx = 0;
+    int val = 0;
+    int j = 0;
+    
+    while (args[j]) {
+        char ch = args[j++];
+        if (ch >= '0' && ch <= '9') {
+            val = val * 10 + (ch - '0');
+            if (val > 255) {
+                printf("Invalid IP\n");
+                return 1;
+            }
+        } else if (ch == '.') {
+            if (idx > 3) {
+                printf("Invalid IP\n");
+                return 1;
+            }
+            ip.bytes[idx++] = (uint8_t)val;
+            val = 0;
+        } else if (ch == ' ' || ch == '\t') {
+            // Skip whitespace
+            while (args[j] == ' ' || args[j] == '\t') j++;
+            j--;
+        } else {
+            printf("Invalid IP\n");
+            return 1;
+        }
+    }
+    
+    if (idx != 3) {
+        printf("Invalid IP\n");
+        return 1;
+    }
+    ip.bytes[3] = (uint8_t)val;
+    
+    printf("Pinging ");
+    for (int i = 0; i < 4; i++) {
+        printf("%d", ip.bytes[i]);
+        if (i < 3) printf(".");
+    }
+    printf("...\n");
+    
+    int result = sys_icmp_ping(&ip);
+    
+    if (result == -2) {
+        printf("Error: Network not initialized. Run 'net init' first.\n");
+        return 1;
+    } else if (result < 0) {
+        printf("Error: Failed to send ping request.\n");
+        return 1;
+    }
+    
+    printf("Ping complete: %d/%d replies received\n", result, 4);
+    
+    return 0;
+}