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December 10, 2018 03:30
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basic client server example in c++with sockets
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| //server.cpp | |
| #include <iostream> | |
| #include <unistd.h> | |
| #include <sys/socket.h> | |
| #include <stdlib.h> | |
| #include <netinet/in.h> | |
| #include <string.h> | |
| #define PORT 8080 | |
| int main(int argc, const char * argv[]) { | |
| // insert code here... | |
| std::cout << "Server's main() called!\n"; | |
| int server_fd; | |
| int new_socket; | |
| int valread; | |
| struct sockaddr_in address; | |
| int opt = 1; | |
| int addrlen = sizeof(address); | |
| char buffer[1024] = {0}; | |
| char *hello = "Hi message from server"; | |
| //create socket file descriptor | |
| if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) { | |
| std::cout << "Socket fd fail " << std::endl; | |
| return EXIT_FAILURE; | |
| } else { | |
| std::cout << "socket fd success. server_fd: " << server_fd << std::endl; | |
| } | |
| if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt)) == 0) { | |
| std::cout << "Set socket opt fail" << std::endl; | |
| } else { | |
| std::cout << "Set socket opt success" << std::endl; | |
| } | |
| address.sin_family = AF_INET; | |
| address.sin_addr.s_addr = INADDR_ANY; | |
| address.sin_port = htons(PORT); | |
| if(bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) { | |
| std::cout << "bind failed" << std::endl; | |
| return EXIT_FAILURE; | |
| } else { | |
| std::cout << "bind success" << std::endl; | |
| } | |
| if(listen(server_fd, 3) < 0) { | |
| std::cout << "listen failed" << std::endl; | |
| return EXIT_FAILURE; | |
| } else { | |
| std::cout << "listen success" << std::endl; | |
| } | |
| if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) { | |
| std::cout << "accept fail" << std::endl; | |
| } else { | |
| std::cout << "accept success" << std::endl; | |
| } | |
| valread = read(new_socket, buffer, 1024); | |
| std::cout << "buffer: " << buffer << std::endl; | |
| send(new_socket, hello, strlen(hello), 0); | |
| std::cout << "Hello message sent\n" << std::endl; | |
| return 0; | |
| } | |
| //client.cpp | |
| #include <stdio.h> | |
| #include <sys/socket.h> | |
| #include <stdlib.h> | |
| #include <netinet/in.h> | |
| #include <string.h> | |
| #include <iostream> | |
| #include <arpa/inet.h> | |
| #include <unistd.h> | |
| #define PORT 8080 | |
| int main(int argc, char const *argv[]) { | |
| struct sockaddr_in address; | |
| struct sockaddr_in serv_addr; | |
| int sock = 0; | |
| int valread = 0; | |
| char *hello = "Hello from client"; | |
| char buffer[1024] = {0}; | |
| if ((sock = socket(AF_INET, SOCK_STREAM, 0))< 0) { | |
| std::cout << "socket creation error" << std::endl; | |
| return EXIT_FAILURE; | |
| } else { | |
| std::cout << "socket creation success" << std::endl; | |
| } | |
| memset(&serv_addr, '0', sizeof(serv_addr)); | |
| serv_addr.sin_family = AF_INET; | |
| serv_addr.sin_port = htons(PORT); | |
| //Convert IPv4 and IPv6 addresses from text to binary | |
| if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) { | |
| std::cout << "Invalid address / address not supported" << std::endl; | |
| return EXIT_FAILURE; | |
| } else { | |
| std::cout << "Valid address " << std::endl; | |
| } | |
| if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) { | |
| std::cout << "Connected failed" << std::endl; | |
| return EXIT_FAILURE; | |
| } else { | |
| std::cout << "Connected successfully" << std::endl; | |
| } | |
| send(sock, hello, strlen(hello), 0); | |
| std::cout << "Hello message sent from client" << std::endl; | |
| valread = read(sock, buffer, 1024); | |
| std::cout << "" << std::endl; | |
| std::cout << "buffer: " << buffer << std::endl; | |
| return 0; | |
| } |
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