CA1

.gitignore

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+CA1/*.out
+CA1/*.exe
+#CA1/CMakeLists.txt
+#CA1/cmake-build-debug

CA1/Source/client.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <sys/time.h>
+
+int connectServer(int port) {
+ int fd;
+ struct sockaddr_in server_address;
+
+ fd = socket(AF_INET, SOCK_STREAM, 0);
+
+ server_address.sin_family = AF_INET;
+ server_address.sin_port = htons(port);
+ server_address.sin_addr.s_addr = inet_addr("127.0.0.1");
+
+ if (connect(fd, (struct sockaddr *) &server_address, sizeof(server_address)) < 0) { // checking for errors
+ printf("Error in connecting to server\n");
+ }
+
+ return fd;
+}
+
+int main() {
+
+ int fd;
+ char buff[1024] = {0};
+
+ fd = connectServer(8080);
+
+ read(0, buff, 1024); // fd = 0 -> stdin
+
+ send(fd, buff, strlen(buff), 0);
+
+ recv(fd, buff, 1024, 0);
+
+ printf("Server said: %s\n", buff);
+
+ close(fd);
+
+
+ return 0;
+}

CA1/Source/server.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <sys/time.h>
+
+int setupServer(int port) {
+ struct sockaddr_in address;
+ int server_fd;
+ server_fd = socket(AF_INET, SOCK_STREAM, 0);
+
+ int opt = 1;
+ setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
+
+ address.sin_family = AF_INET;
+ address.sin_addr.s_addr = INADDR_ANY;
+ address.sin_port = htons(port);
+
+ bind(server_fd, (struct sockaddr *) &address, sizeof(address));
+
+ listen(server_fd, 4);
+
+ return server_fd;
+}
+
+int acceptClient(int server_fd) {
+ int client_fd;
+ struct sockaddr_in client_address;
+ int address_len = sizeof(client_address);
+
+ client_fd = accept(server_fd, (struct sockaddr *) &client_address, (socklen_t * ) & address_len);
+ printf("Client connected!\n");
+
+ return client_fd;
+}
+
+int main() {
+
+ int server_fd, client_fd;
+ char buff[1024] = {0};
+
+ server_fd = setupServer(8080);
+
+ int client_count = 0;
+
+ while (1) {
+ client_fd = acceptClient(server_fd);
+ client_count++;
+
+ memset(buff, 0, 1024);
+ recv(client_fd, buff, 1024, 0);
+
+ printf("Client said: %s\n", buff);
+
+ sprintf(buff, "Hello from server, you're client %d", client_count);
+ }
+
+ return 0;
+}

CA1/makefile

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+COMPILER=gcc
+SRC=Source
+
+all: client.out server.out
+
+client.out: ${SRC}/client.c
+ ${COMPILER} ${SRC}/client.c -o $@
+server.out: ${SRC}/client.c
+ ${COMPILER} ${SRC}/server.c -o $@
+
+clean:
+ rm *.out