working udp

server/main.c

@@ -4,7 +4,7 @@ int main(int argc, char *argv[]) {
 //    char quote[1024];
 //    getRandomQuote(quote);
 //    printf("%s\n", quote);
-    tcpServer();
+    udpServer();
 
     return 0;
 }

server/server.c

@@ -4,10 +4,18 @@
 
 #include "server.h"
 
+//TODO: refactor
+//TODO: object-like C
+
+extern int errno;
+
+unsigned long addressLength = sizeof(struct sockaddr_in);
+
+
 void tcpServer() {
     int serverSocket, clientSocket;
-    long read_size;
-    unsigned long addressLength;
+    long recvLen;
+//    unsigned long addressLength = sizeof(struct sockaddr_in);
     struct sockaddr_in serverAddress, clientAddress;
     char quote[MESSAGE_STRING_LENGTH] = "";
     char clientMessage[MESSAGE_STRING_LENGTH] = "";
@@ -38,13 +46,13 @@ void tcpServer() {
 
     /*accept connections*/
     //TODO: t h r e a d s
-    addressLength = sizeof(struct sockaddr_in);
-    while ((clientSocket = accept(serverSocket, (struct sockaddr *) &clientAddress, (socklen_t *) &addressLength)) >= 0) {
+    while ((clientSocket = accept(serverSocket, (struct sockaddr *) &clientAddress, (socklen_t *) &addressLength)) >=
+           0) {
         puts("client connected");
 
         /*receive data*/
-        while ((read_size = recv(clientSocket, clientMessage, MESSAGE_STRING_LENGTH, 0))) {
-            if (read_size < 0) {
+        while ((recvLen = recv(clientSocket, clientMessage, MESSAGE_STRING_LENGTH, 0))) {
+            if (recvLen < 0) {
                 puts("receive failed");
             } else {
                 printf("client says: %s\n", clientMessage);
@@ -52,7 +60,7 @@ void tcpServer() {
                 /*send data*/
                 getRandomQuote(quote);
                 printf("responding: \"%s\"\n", quote);
-                write(clientSocket, quote, strlen(quote));
+                send(clientSocket, quote, strlen(quote), 0);
             }
         }
 
@@ -65,6 +73,57 @@ void tcpServer() {
     }
 }
 
-void udpServer() {
-    //TODO: udp handling
+_Noreturn void udpServer() {
+    int sock;
+//    unsigned long addressLength = sizeof(struct sockaddr_in);
+    struct sockaddr_in serverAddress, clientAddress;
+    char quote[MESSAGE_STRING_LENGTH] = "";
+    char clientMessage[MESSAGE_STRING_LENGTH] = "";
+
+    /*initialize sock info*/
+    memset(&serverAddress, 0, addressLength);
+    memset(&clientAddress, 0, addressLength);
+
+    serverAddress.sin_family = AF_INET;
+    serverAddress.sin_addr.s_addr = INADDR_ANY;
+    serverAddress.sin_port = htons(17);
+
+    /*create sock*/
+    sock = socket(serverAddress.sin_family, SOCK_DGRAM, IPPROTO_UDP);
+    if (sock == -1) {
+        puts("sock not created");
+        exit(1);
+    }
+    puts("sock created");
+
+    /*bind sock to address:port*/
+    if (bind(sock, (const struct sockaddr *) &serverAddress, sizeof serverAddress) < 0) {
+        puts("bind failed");
+        exit(2);
+    }
+    puts("address bound");
+
+    /*accept connections*/
+    //TODO: t h r e a d s ?
+    while (1) {
+        /*receive data*/
+        int recvLen = recvfrom(sock, clientMessage, MESSAGE_STRING_LENGTH, 0,
+                               (struct sockaddr *) &clientAddress, (socklen_t *) &addressLength);
+
+        uint16_t port = ntohs(clientAddress.sin_port);
+        char *ipv4 = inet_ntoa(clientAddress.sin_addr);
+
+        printf("recvLen = %d from = %s:%d\nmsg = `%s`\n", recvLen, ipv4, port, clientMessage);
+
+        perror("recvfrom");
+        if (recvLen >= 0) {
+            printf("client says: %s\n", clientMessage);
+
+            /*send data*/
+            getRandomQuote(quote);
+            printf("responding: `%s`\n", quote);
+            sendto(sock, strcat(quote, "\n"), sizeof quote, 0, (struct sockaddr *) &clientAddress, addressLength);
+            perror("sendto");
+        }
+    }
 }

server/server.h

@@ -6,11 +6,14 @@
 #define QOTD_SERVER_H
 
 #include <sys/socket.h>
+//#include <sys/types.h>
 #include <netinet/in.h>
+#include <arpa/inet.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
 #include <stdio.h>
+#include <errno.h>
 
 #include "quote.h"
 
@@ -18,6 +21,6 @@
 
 void tcpServer();
 
-void udpServer();
+_Noreturn void udpServer();
 
 #endif //QOTD_SERVER_H