Initial commit: add environment monitoring TCP backend

console_client.cpp

@@ -0,0 +1,56 @@
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <cstring>
+#include <iostream>
+
+int main(int argc, char **argv) {
+    if (argc < 3) {
+        std::cout << "Usage: " << argv[0] << " <host> <port>\n";
+        return 1;
+    }
+    const char *host = argv[1];
+    int port = std::atoi(argv[2]);
+
+    int sock = socket(AF_INET, SOCK_STREAM, 0);
+    if (sock < 0) {
+        perror("socket");
+        return 1;
+    }
+    struct sockaddr_in addr;
+    std::memset(&addr, 0, sizeof(addr));
+    addr.sin_family = AF_INET;
+    addr.sin_port = htons(port);
+    if (inet_pton(AF_INET, host, &addr.sin_addr) <= 0) {
+        perror("inet_pton");
+        close(sock);
+        return 1;
+    }
+
+    if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+        perror("connect");
+        close(sock);
+        return 1;
+    }
+    std::cout << "Connected to " << host << ":" << port << std::endl;
+
+    char buf[1024];
+    while (true) {
+        ssize_t n = recv(sock, buf, sizeof(buf)-1, 0);
+        if (n > 0) {
+            buf[n] = '\0';
+            std::cout << buf;
+            std::cout.flush();
+        } else if (n == 0) {
+            std::cout << "Server closed connection\n";
+            break;
+        } else {
+            perror("recv");
+            break;
+        }
+    }
+    close(sock);
+    return 0;
+}