First commit

2026-09-06 17:43:06 +03:00
commit 0fe9114117
10 changed files with 278 additions and 0 deletions
--- a/ch1/TCPEchoServer4.c
+++ b/ch1/TCPEchoServer4.c
@@ -0,0 +1,95 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "Practical.h"
+#include "TCPServerUtility.h"
+
+static const int MAXPENDING = 5;
+
+int main(int argc, char **argv) {
+    if (argc != 2) {
+        DieWithUserMessage("Parameter(s)", "<Server Port>");
+    }
+
+    const in_port_t server_port = atoi(argv[1]);
+
+    const int server_sock = socket(AF_INET, SOCK_STREAM, proto_get_num("tcp"));
+    if (server_sock < 0) {
+        DieWithSystemMessage("socket() failed");
+    }
+
+    struct sockaddr_in server_addr = {
+        .sin_family = AF_INET,
+        .sin_addr = {
+            .s_addr = htonl(INADDR_ANY),
+        },
+        .sin_port = htons(server_port)
+    };
+
+    int ret_val = bind(
+        server_sock,
+        (struct sockaddr *) &server_addr,
+        sizeof(server_addr)
+    );
+    if (ret_val < 0) {
+        DieWithSystemMessage("bind() failed");
+    }
+
+    ret_val = listen(server_sock, MAXPENDING);
+    if (ret_val < 0) {
+        DieWithSystemMessage("listen() failed");
+    } else {
+        char server_name[INET_ADDRSTRLEN];
+        const char *ntop_res = inet_ntop(
+            AF_INET,
+            &server_addr.sin_addr.s_addr,
+            server_name,
+            sizeof(server_name)
+        );
+        if (ntop_res != NULL) {
+            printf("Listening on %s/%d...\n", server_name, server_port);
+        } else {
+            puts("Unable to get server address");
+        }
+    }
+
+    while (1) {
+        struct sockaddr_in client_addr;
+        socklen_t client_addr_len = sizeof(client_addr);
+
+        int client_sock = accept(
+            server_sock,
+            (struct sockaddr *) &client_addr,
+            &client_addr_len
+        );
+        if (client_sock < 0) {
+            DieWithSystemMessage("accept() failed");
+        }
+
+        char client_name[INET_ADDRSTRLEN];
+        const char *ntop_res = inet_ntop(
+            AF_INET,
+            &client_addr.sin_addr.s_addr,
+            client_name,
+            sizeof(client_name)
+        );
+        if (ntop_res != NULL) {
+            printf(
+                "Handling client %s/%d\n",
+                client_name,
+                ntohs(client_addr.sin_port)
+            );
+        } else {
+            puts("Unable to get client address");
+        }
+
+        HandleTCPClient(client_sock);
+    }
+
+    return 0;
+}